WO2013109064A1 - Procédé destiné au traitement d'informations de localisation dans un système de communication sans fil et appareil pour la prise en charge de ce procédé - Google Patents

Procédé destiné au traitement d'informations de localisation dans un système de communication sans fil et appareil pour la prise en charge de ce procédé Download PDF

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WO2013109064A1
WO2013109064A1 PCT/KR2013/000368 KR2013000368W WO2013109064A1 WO 2013109064 A1 WO2013109064 A1 WO 2013109064A1 KR 2013000368 W KR2013000368 W KR 2013000368W WO 2013109064 A1 WO2013109064 A1 WO 2013109064A1
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Prior art keywords
location information
terminal
type
location
cell
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PCT/KR2013/000368
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English (en)
Korean (ko)
Inventor
정성훈
이영대
박성준
이승준
이재욱
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엘지전자 주식회사
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Priority to US14/372,184 priority Critical patent/US20150024788A1/en
Priority to KR1020147019470A priority patent/KR101637797B1/ko
Publication of WO2013109064A1 publication Critical patent/WO2013109064A1/fr

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    • 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

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method for processing location information in a wireless communication system and an apparatus supporting the same.
  • 3GPP LTE long term evolution
  • UMTS Universal Mobile Telecommunications System
  • 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in downlink and single carrier-frequency division multiple access (SC-FDMA) in uplink.
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier-frequency division multiple access
  • MIMO multiple input multiple output
  • LTE-A 3GPP LTE-Advanced
  • MDT Minimization of Driving Tests
  • MDTs can be divided into logged MDTs and immediate MDTs.
  • the terminal transmits a logged measurement to the network at a specific time after performing the MDT measurement.
  • the terminal performs the MDT measurement and then delivers the logged measurement to the network when the reporting condition is satisfied.
  • the logging of the measurement result in the logged MDT may be limited to logging the measurement result according to the measurement performed in the RRC idle mode. It is also possible that the measured measurements are used in RRC connected mode according to the instructions of the network.
  • the UE may perform the MDT measurement in the RRC connected mode.
  • various location measurement techniques may be used to determine the location of the terminal when logging the measurement result.
  • the terminal or the network performs location measurement of the terminal and the obtained location information is location information indicating the location of the actual terminal, the location information may be directly correlated with the logged measurement.
  • the obtained location information does not indicate the location of the actual terminal, but is location information requiring specific data processing to be applied to determine the location of the actual terminal, the location information before the terminal correlates with the logged measurement. It needs to be processed to indicate the actual location of.
  • the network node that collects the logged measurement may have difficulty in acquiring the location information related to the logged measurement because the time at which the logged measurement is acquired is different from the time at which the terminal information is acquired. Therefore, in such a case, identification information for correlating the acquired logged measurement with the location information may be provided, and a method of processing the location information based on this may be required.
  • An object of the present invention is to provide a method for processing location information in a wireless communication system and an apparatus supporting the same.
  • a method of processing location information performed by a network node in a wireless communication system obtains the location information of the terminal, obtains a log identifier identifying a logged measurement associated with the location information of the terminal, determines the type of the location information, and if the location information is a first type, the first information; And transmitting one type of location information and the log identifier to a location information calculation node.
  • the method may further include transmitting the location information of the second type and the log identifier to a log collection node if the location information is the second type.
  • the location information of the first type may be an information type that requires a specific process to indicate the location of the terminal.
  • the location information of the second type may be an information type that directly indicates the location of the terminal.
  • the location information of the first type may be processed by the location information calculation node based on additional information.
  • the processed first type of location information and the log identifier may be transmitted from the location information calculation node to the log collection node.
  • the location information of the second type may be correlated with the logged measurement identified by the log identifier.
  • the processed first type of location information may be correlated with the logged measurement identified by the log identifier.
  • the network node may be a serving base station of the terminal.
  • the location information of the first type may be obtained based on an uplink positioning method, which is a technique for measuring the location of the terminal based on a measurement timing of an uplink signal transmitted by the terminal.
  • the network node may be the terminal.
  • the location information of the first type may be obtained based on an uplink positioning method, which is a technique of measuring a location of the terminal based on measurement timing of downlink signals received from a plurality of base stations.
  • the location information of the second type may be obtained through a global navigation satellite system (GNSS).
  • GNSS global navigation satellite system
  • a wireless device that performs a method of processing location information in a wireless communication system.
  • the wireless device includes a Radio Frequency (RF) unit for transmitting and receiving radio signals, and a processor operatively coupled to the RF unit.
  • the processor obtains location information of the terminal, obtains a log identifier identifying a logged measurement associated with the location information of the terminal, determines the type of the location information, and if the location information is a first type, the first information; One type of location information and the log identifier are set to be sent to the location information calculation node.
  • RF Radio Frequency
  • Various positioning methods may be used to log the measurement results to determine where the logged measurement is obtained.
  • the location information obtained through the positioning method may be generated in a type that directly indicates the location of the terminal, but may also be generated in a type that requires a specific process to directly indicate the location of the terminal. Accordingly, when location information generated in various types is provided through various positioning methods, a method for processing location information according to the type of a terminal is provided. The location information thus processed may be correlated with the logged measurement based on the identification information identifying the logged measurement, through which the measured and / or logged location of the logged measurement may be determined.
  • the network can effectively analyze the measurement results included in the logged measurement based on the proposed location information processing method and increase the efficiency of network optimization.
  • FIG. 1 shows a wireless communication system to which the present invention is applied.
  • FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane.
  • FIG. 3 is a block diagram illustrating a radio protocol structure for a control plane.
  • FIG. 4 is a flowchart illustrating an operation of a terminal in an RRC idle state.
  • FIG. 5 is a flowchart illustrating a process of establishing an RRC connection.
  • FIG. 6 is a flowchart illustrating a RRC connection resetting process.
  • FIG. 7 is a diagram illustrating a RRC connection reestablishment procedure.
  • FIG. 8 is a flowchart illustrating a method of performing a logged MDT.
  • FIG. 9 is a diagram illustrating an example of a logged MDT according to a logging region.
  • FIG. 10 is a diagram illustrating an example of a logged MDT according to a RAT change.
  • 11 is a diagram illustrating an example of logged measurements.
  • 12 is a diagram illustrating an example of an immediate MDT.
  • FIG. 13 is a diagram illustrating an example of a structure of a wireless communication system to which positioning of a terminal is applied according to an embodiment of the present invention.
  • FIG. 14 is a diagram illustrating various procedures for location service according to an embodiment of the present invention.
  • 15 is a flowchart illustrating a method of processing location information according to an embodiment of the present invention.
  • 16 is a flowchart illustrating an example of a location information processing method according to an embodiment of the present invention.
  • 17 is a flowchart illustrating another example of the method for processing location information according to the embodiment of the present invention.
  • FIG. 18 is a flowchart illustrating still another example of a method for processing location information according to an embodiment of the present invention.
  • FIG. 19 is a flowchart illustrating still another example of a method for processing location information according to an embodiment of the present invention.
  • 20 is a block diagram illustrating a wireless device in which an embodiment of the present invention is implemented.
  • E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
  • LTE Long Term Evolution
  • the E-UTRAN includes a base station (BS) 20 that provides a control plane and a user plane to a user equipment (UE).
  • the terminal 10 may be fixed or mobile and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device (Wireless Device), and the like.
  • the base station 20 refers to a fixed station communicating with the terminal 10, and may be referred to by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • access point and the like.
  • the base stations 20 may be connected to each other through an X2 interface.
  • the base station 20 is connected to a Serving Gateway (S-GW) through an MME (Mobility Management Entity) and an S1-U through an Evolved Packet Core (EPC) 30, more specifically, an S1-MME through an S1 interface.
  • S-GW Serving Gateway
  • MME Mobility Management Entity
  • EPC Evolved Packet Core
  • EPC 30 is composed of MME, S-GW and P-GW (Packet Data Network-Gateway).
  • the MME has information about the access information of the terminal or the capability of the terminal, and this information is mainly used for mobility management of the terminal.
  • S-GW is a gateway having an E-UTRAN as an endpoint
  • P-GW is a gateway having a PDN as an endpoint.
  • Layers of the Radio Interface Protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems.
  • L2 second layer
  • L3 third layer
  • the RRC Radio Resource Control
  • the RRC layer located in the third layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges an RRC message between the terminal and the base station.
  • FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane.
  • 3 is a block diagram illustrating a radio protocol structure for a control plane.
  • the data plane is a protocol stack for user data transmission
  • the control plane is a protocol stack for control signal transmission.
  • a physical layer (PHY) layer provides an information transfer service to a higher layer using a physical channel.
  • the physical layer is connected to a medium access control (MAC) layer, which is an upper layer, through a transport channel. Data is moved between the MAC layer and the physical layer through the transport channel. Transport channels are classified according to how and with what characteristics data is transmitted over the air interface.
  • MAC medium access control
  • the physical channel may be modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.
  • OFDM orthogonal frequency division multiplexing
  • the functions of the MAC layer include mapping between logical channels and transport channels and multiplexing / demultiplexing into transport blocks provided as physical channels on transport channels of MAC service data units (SDUs) belonging to the logical channels.
  • the MAC layer provides a service to a Radio Link Control (RLC) layer through a logical channel.
  • RLC Radio Link Control
  • RLC layer Functions of the RLC layer include concatenation, segmentation, and reassembly of RLC SDUs.
  • QoS Quality of Service
  • the RLC layer has a transparent mode (TM), an unacknowledged mode (UM), and an acknowledged mode (Acknowledged Mode).
  • TM transparent mode
  • UM unacknowledged mode
  • Acknowledged Mode acknowledged mode
  • AM Three modes of operation (AM).
  • AM RLC provides error correction through an automatic repeat request (ARQ).
  • the RRC (Radio Resource Control) layer is defined only in the control plane.
  • the RRC layer is responsible for the control of logical channels, transport channels, and physical channels in connection with configuration, re-configuration, and release of radio bearers.
  • RB means a logical path provided by the first layer (PHY layer) and the second layer (MAC layer, RLC layer, PDCP layer) for data transmission between the terminal and the network.
  • PDCP Packet Data Convergence Protocol
  • Functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include delivery of user data, header compression, and ciphering.
  • the functionality of the Packet Data Convergence Protocol (PDCP) layer in the user plane includes the transfer of control plane data and encryption / integrity protection.
  • the establishment of the RB means a process of defining characteristics of a radio protocol layer and a channel to provide a specific service, and setting each specific parameter and operation method.
  • RB can be further divided into SRB (Signaling RB) and DRB (Data RB).
  • SRB is used as a path for transmitting RRC messages in the control plane
  • DRB is used as a path for transmitting user data in the user plane.
  • the UE If an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in an RRC connected state, otherwise it is in an RRC idle state.
  • the downlink transmission channel for transmitting data from the network to the UE includes a BCH (Broadcast Channel) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages.
  • Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH).
  • the uplink transport channel for transmitting data from the terminal to the network includes a random access channel (RACH) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.
  • RACH random access channel
  • SCH uplink shared channel
  • BCCH broadcast control channel
  • PCCH paging control channel
  • CCCH common control channel
  • MCCH multicast control channel
  • MTCH multicast traffic
  • the physical channel is composed of several OFDM symbols in the time domain and several sub-carriers in the frequency domain.
  • One sub-frame consists of a plurality of OFDM symbols in the time domain.
  • the RB is a resource allocation unit and includes a plurality of OFDM symbols and a plurality of subcarriers.
  • each subframe may use specific subcarriers of specific OFDM symbols (eg, the first OFDM symbol) of the corresponding subframe for the physical downlink control channel (PDCCH), that is, the L1 / L2 control channel.
  • Transmission Time Interval is a unit time of subframe transmission.
  • the RRC state refers to whether or not the RRC layer of the UE is in a logical connection with the RRC layer of the E-UTRAN. If connected, the RRC connection state is called. Since the UE in the RRC connected state has an RRC connection, the E-UTRAN can grasp the existence of the corresponding UE in a cell unit, and thus can effectively control the UE. On the other hand, the UE of the RRC idle state cannot be recognized by the E-UTRAN, and is managed by the CN (core network) in units of a tracking area, which is a larger area unit than a cell. That is, the UE in the RRC idle state is identified only in a large area unit, and must move to the RRC connected state to receive a normal mobile communication service such as voice or data.
  • CN core network
  • the terminal When the user first powers on the terminal, the terminal first searches for an appropriate cell and then stays in an RRC idle state in the cell.
  • the UE in the RRC idle state needs to establish an RRC connection, it establishes an RRC connection with the E-UTRAN through an RRC connection procedure and transitions to the RRC connected state.
  • RRC connection procedure There are several cases in which the UE in RRC idle state needs to establish an RRC connection. For example, an uplink data transmission is necessary due to a user's call attempt, or a paging message is sent from E-UTRAN. If received, a response message may be sent.
  • the non-access stratum (NAS) layer located above the RRC layer performs functions such as session management and mobility management.
  • EMM-REGISTERED EPS Mobility Management-REGISTERED
  • EMM-DEREGISTERED EMM-DEREGISTERED
  • the initial terminal is in the EMM-DEREGISTERED state, and the terminal performs a process of registering with the corresponding network through an initial attach procedure to access the network. If the attach procedure is successfully performed, the UE and the MME are in the EMM-REGISTERED state.
  • an EPS Connection Management (ECM) -IDLE state In order to manage a signaling connection between the UE and the EPC, two states are defined, an EPS Connection Management (ECM) -IDLE state and an ECM-CONNECTED state, and these two states are applied to the UE and the MME.
  • ECM EPS Connection Management
  • ECM-IDLE state When the UE in the ECM-IDLE state establishes an RRC connection with the E-UTRAN, the UE is in the ECM-CONNECTED state.
  • the MME in the ECM-IDLE state becomes the ECM-CONNECTED state when it establishes an S1 connection with the E-UTRAN.
  • the E-UTRAN does not have context information of the terminal.
  • the UE in the ECM-IDLE state performs a terminal-based mobility related procedure such as cell selection or cell reselection without receiving a command from the network.
  • a terminal-based mobility related procedure such as cell selection or cell reselection without receiving a command from the network.
  • the terminal when the terminal is in the ECM-CONNECTED state, the mobility of the terminal is managed by the command of the network.
  • the terminal In the ECM-IDLE state, if the position of the terminal is different from the position known by the network, the terminal informs the network of the corresponding position of the terminal through a tracking area update procedure.
  • the system information includes essential information that the terminal needs to know in order to access the base station. Therefore, the terminal must receive all system information before accessing the base station, and must always have the latest system information. In addition, since the system information is information that all terminals in a cell should know, the base station periodically transmits the system information.
  • the system information includes a master information block (MIB) and a scheduling block (SB). , SIB System Information Block).
  • MIB master information block
  • SB scheduling block
  • the MIB enables the UE to know the physical configuration of the cell, for example, bandwidth.
  • SB informs transmission information of SIBs, for example, a transmission period.
  • SIB is a collection of related system information. For example, some SIBs contain only information of neighboring cells, and some SIBs contain only information of an uplink radio channel used by the terminal.
  • services provided by a network to a terminal can be classified into three types as follows.
  • the terminal also recognizes the cell type differently according to which service can be provided. The following describes the service type first, followed by the cell type.
  • Limited service This service provides Emergency Call and Tsunami Warning System (ETWS) and can be provided in an acceptable cell.
  • ETWS Emergency Call and Tsunami Warning System
  • Normal service This service means a public use for general use, and can be provided in a suitable or normal cell.
  • This service means service for network operator. This cell can be used only by network operator and not by general users.
  • the cell types may be classified as follows.
  • Acceptable cell A cell in which the terminal can receive limited service. This cell is a cell that is not barred from the viewpoint of the terminal and satisfies the cell selection criteria of the terminal.
  • Suitable cell The cell that the terminal can receive a regular service. This cell satisfies the conditions of an acceptable cell and at the same time satisfies additional conditions. As an additional condition, this cell must belong to a Public Land Mobile Network (PLMN) to which the terminal can access, and must be a cell which is not prohibited from performing a tracking area update procedure of the terminal. If the cell is a CSG cell, the terminal should be a cell that can be connected to the cell as a CSG member.
  • PLMN Public Land Mobile Network
  • Barred cell A cell that broadcasts information that a cell is a prohibited cell through system information.
  • Reserved cell A cell that broadcasts information that a cell is a reserved cell through system information.
  • 4 is a flowchart illustrating an operation of a terminal in an RRC idle state. 4 illustrates a procedure in which a UE, which is initially powered on, registers with a network through a cell selection process and then reselects a cell if necessary.
  • the terminal selects a radio access technology (RAT) for communicating with a public land mobile network (PLMN), which is a network to be serviced (S410).
  • RAT radio access technology
  • PLMN public land mobile network
  • S410 a network to be serviced
  • Information about the PLMN and the RAT may be selected by a user of the terminal or may be stored in a universal subscriber identity module (USIM).
  • USIM universal subscriber identity module
  • the terminal selects a cell having the largest value among the measured base station and a cell whose signal strength or quality is greater than a specific value (Cell Selection) (S420). This is referred to as initial cell selection by the UE that is powered on to perform cell selection. The cell selection procedure will be described later.
  • the terminal receives system information periodically transmitted by the base station.
  • the above specific value refers to a value defined in the system in order to ensure the quality of the physical signal in data transmission / reception. Therefore, the value may vary depending on the RAT applied.
  • the terminal performs a network registration procedure (S430).
  • the terminal registers its information (eg IMSI) in order to receive a service (eg paging) from the network.
  • IMSI information
  • a service eg paging
  • the terminal selects a cell, the terminal does not register to the access network, and if the network information received from the system information (e.g., tracking area identity; TAI) is different from the network information known to the network, the terminal registers to the network. do.
  • the system information e.g., tracking area identity; TAI
  • the terminal performs cell reselection based on the service environment provided by the cell or the environment of the terminal (S440).
  • the terminal selects one of the other cells that provides better signal characteristics than the cell of the base station to which the terminal is connected if the strength or quality of the signal measured from the base station being service is lower than the value measured from the base station of the adjacent cell. do.
  • This process is called Cell Re-Selection, which is distinguished from Initial Cell Selection of Step 2.
  • a time constraint is placed. The cell reselection procedure will be described later.
  • FIG. 5 is a flowchart illustrating a process of establishing an RRC connection.
  • the terminal sends an RRC connection request message to the network requesting an RRC connection (S510).
  • the network sends an RRC connection setup message in response to the RRC connection request (S520). After receiving the RRC connection configuration message, the terminal enters the RRC connection mode.
  • the terminal sends an RRC Connection Setup Complete message used to confirm successful completion of RRC connection establishment to the network (S530).
  • RRC connection reconfiguration is used to modify an RRC connection. It is used to establish / modify / release RBs, perform handovers, and set up / modify / release measurements.
  • the network sends an RRC connection reconfiguration message for modifying the RRC connection to the terminal (S610).
  • the UE sends an RRC connection reconfiguration complete message used to confirm successful completion of the RRC connection reconfiguration to the network (S620).
  • the terminal selects / reselects a cell of appropriate quality and performs procedures for receiving service.
  • the UE in the RRC idle state should always select a cell of appropriate quality and prepare to receive service through this cell. For example, a terminal that has just been powered on must select a cell of appropriate quality to register with the network. When the terminal in the RRC connected state enters the RRC idle state, the terminal should select a cell to stay in the RRC idle state. As such, the process of selecting a cell satisfying a certain condition in order for the terminal to stay in a service standby state such as an RRC idle state is called cell selection.
  • the cell selection is performed in a state in which the UE does not currently determine a cell to stay in the RRC idle state, it is most important to select the cell as soon as possible. Therefore, if the cell provides a radio signal quality of a predetermined criterion or more, even if this cell is not the cell providing the best radio signal quality to the terminal, it may be selected during the cell selection process of the terminal.
  • PLMN public land mobile network
  • PLMN is a network deployed or operated by a mobile network operator. Each mobile network operator operates one or more PLMNs. Each PLMN may be identified by a mobile country code (MCC) and a mobile network code (MCN). The PLMN information of the cell is included in the system information and broadcasted.
  • MCC mobile country code
  • MN mobile network code
  • the terminal attempts to register the selected PLMN. If the registration is successful, the selected PLMN becomes a registered PLMN (RPLMN).
  • the network may signal the PLMN list to the UE, which may consider PLMNs included in the PLMN list as PLMNs such as RPLMNs.
  • the UE registered in the network should be reachable by the network at all times. If the UE is in the ECM-CONNECTED state (same as RRC connected state), the network recognizes that the UE is receiving service. However, when the terminal is in the ECM-IDLE state (same as the RRC idle state), the situation of the terminal is not valid in the eNB but is stored in the MME. In this case, the location of the UE in the ECM-IDLE state is known only to the MME as granularity of the list of tracking areas (TAs). A single TA is identified by a tracking area identity (TAI) consisting of the PLMN identifier to which the TA belongs and a tracking area code (TAC) that uniquely represents the TA within the PLMN.
  • TAI tracking area identity
  • TAC tracking area code
  • the UE selects a cell having a signal quality and characteristics capable of receiving an appropriate service from among cells provided by the selected PLMN.
  • an initial cell selection process in which the terminal does not have prior information on the radio channel. Accordingly, the terminal searches all radio channels to find an appropriate cell. In each channel, the terminal finds the strongest cell. Thereafter, the terminal selects a corresponding cell if it finds a suitable cell that satisfies a cell selection criterion.
  • the terminal may select the cell by using the stored information or by using the information broadcast in the cell.
  • cell selection can be faster than the initial cell selection process.
  • the UE selects a corresponding cell if it finds a cell that satisfies the cell selection criteria. If a suitable cell that satisfies the cell selection criteria is not found through this process, the UE performs an initial cell selection process.
  • the terminal After the terminal selects a cell through a cell selection process, the strength or quality of a signal between the terminal and the base station may change due to a change in mobility or a wireless environment of the terminal. Therefore, if the quality of the selected cell is degraded, the terminal may select another cell that provides better quality. When reselecting a cell in this way, a cell that generally provides better signal quality than the currently selected cell is selected. This process is called cell reselection.
  • the cell reselection process has a basic purpose in selecting a cell that generally provides the best quality to a terminal in view of the quality of a radio signal.
  • the network may determine the priority for each frequency and notify the terminal. Upon receiving this priority, the UE considers this priority prior to the radio signal quality criteria in the cell reselection process.
  • a method of selecting or reselecting a cell according to a signal characteristic of a wireless environment In selecting a cell for reselection when reselecting a cell, the following cell reselection is performed according to a cell's RAT and frequency characteristics. There may be a method of selection.
  • Intra-frequency cell reselection Reselection of a cell having a center-frequency equal to the RAT, such as a cell where the UE is camping
  • Inter-frequency cell reselection Reselects a cell having a center frequency different from that of the same RAT as the cell camping
  • Inter-RAT cell reselection UE reselects a cell using a RAT different from the camping RAT
  • the UE measures the quality of a serving cell and a neighboring cell for cell reselection.
  • cell reselection is performed based on cell reselection criteria.
  • the cell reselection criteria have the following characteristics with respect to serving cell and neighbor cell measurements.
  • Intra-frequency cell reselection is basically based on ranking.
  • Ranking is an operation of defining index values for cell reselection evaluation and using the index values to order the cells in the order of the index values.
  • the cell with the best indicator is often called the best ranked cell.
  • the cell index value is a value obtained by applying a frequency offset or a cell offset as necessary based on the value measured by the terminal for the corresponding cell.
  • Inter-frequency cell reselection is based on the frequency priority provided by the network.
  • the terminal attempts to camp on the frequency with the highest frequency priority.
  • the network may provide the priorities to be commonly applied to the terminals in the cell or provide the frequency priority through broadcast signaling, or may provide the priority for each frequency for each terminal through dedicated signaling.
  • the network may provide the UE with parameters (for example, frequency-specific offset) used for cell reselection for each frequency.
  • the network may provide the UE with a neighboring cell list (NCL) used for cell reselection to the UE.
  • NCL neighboring cell list
  • This NCL contains cell-specific parameters (eg cell-specific offsets) used for cell reselection.
  • the network may provide the UE with a cell reselection prohibition list (black list) used for cell reselection to the UE.
  • the UE does not perform cell reselection for a cell included in the prohibition list.
  • the ranking criterion used to prioritize the cells is defined as in Equation 1.
  • Rs is a ranking indicator of the serving cell
  • Rn is a ranking indicator of the neighbor cell
  • Qmeas s is a quality value measured by the UE for the serving cell
  • Qmeas n is a quality value measured by the UE for the neighbor cell
  • Qhyst is The hysteresis value, Qoffset, for the ranking is the offset between two cells.
  • the ranking index Rs of the serving cell and the ranking index Rn of the neighboring cell change in a similar state, the ranking ranking is constantly changed as a result of the change, such that the terminal may alternately select two cells.
  • Qhyst is a parameter for giving hysteresis in cell reselection to prevent the UE from reselecting two cells alternately.
  • the UE measures the Rs of the serving cell and the Rn of the neighboring cell according to the above equation, considers the cell having the highest ranking indicator value as the best ranked cell, and reselects the cell.
  • the quality of the cell serves as the most important criterion in cell reselection. If the reselected cell is not a normal cell, the terminal excludes the frequency or the corresponding cell from the cell reselection target.
  • the UE continuously measures to maintain the quality of the radio link with the serving cell receiving the service.
  • the terminal determines whether communication is impossible in the current situation due to deterioration of the quality of the radio link with the serving cell. If the quality of the serving cell is so low that communication is almost impossible, the terminal determines the current situation as a radio connection failure.
  • the UE abandons communication with the current serving cell, selects a new cell through a cell selection (or cell reselection) procedure, and reestablishes an RRC connection to the new cell (RRC connection re). -establishment).
  • the UE determines that there is a serious problem in the downlink communication quality based on the radio quality measurement result of the physical layer of the UE (when it is determined that the PCell quality is low during the RLM)
  • FIG. 7 is a diagram illustrating a RRC connection reestablishment procedure.
  • the terminal stops use of all radio bearers which have been set except for Signaling Radio Bearer # 0 (SRB 0) and initializes various sublayers of an access stratum (AS) (S710).
  • SRB 0 Signaling Radio Bearer # 0
  • AS access stratum
  • each sublayer and physical layer are set to a default configuration.
  • the UE maintains an RRC connection state.
  • the UE performs a cell selection procedure for performing an RRC connection reconfiguration procedure (S720).
  • the cell selection procedure of the RRC connection reestablishment procedure may be performed in the same manner as the cell selection procedure performed by the UE in the RRC idle state, although the UE maintains the RRC connection state.
  • the terminal After performing the cell selection procedure, the terminal checks the system information of the corresponding cell to determine whether the corresponding cell is a suitable cell (S730). If it is determined that the selected cell is an appropriate E-UTRAN cell, the terminal transmits an RRC connection reestablishment request message to the cell (S740).
  • the RRC connection re-establishment procedure is stopped, the terminal is in the RRC idle state Enter (S750).
  • the terminal may be implemented to complete the confirmation of the appropriateness of the cell within a limited time through the cell selection procedure and the reception of system information of the selected cell.
  • the UE may drive a timer as the RRC connection reestablishment procedure is initiated.
  • the timer may be stopped when it is determined that the terminal has selected a suitable cell. If the timer expires, the UE may consider that the RRC connection reestablishment procedure has failed and may enter the RRC idle state.
  • This timer is referred to hereinafter as a radio link failure timer.
  • a timer named T311 may be used as a radio link failure timer.
  • the terminal may obtain the setting value of this timer from the system information of the serving cell.
  • the cell When the RRC connection reestablishment request message is received from the terminal and the request is accepted, the cell transmits an RRC connection reestablishment message to the terminal.
  • the UE Upon receiving the RRC connection reestablishment message from the cell, the UE reconfigures the PDCP sublayer and the RLC sublayer for SRB1. In addition, it recalculates various key values related to security setting and reconfigures the PDCP sublayer responsible for security with newly calculated security key values. Through this, SRB 1 between the UE and the cell is opened and an RRC control message can be exchanged. The terminal completes the resumption of SRB1 and transmits an RRC connection reestablishment complete message indicating that the RRC connection reestablishment procedure is completed to the cell (S760).
  • the cell transmits an RRC connection reestablishment reject message to the terminal.
  • the cell and the terminal performs the RRC connection reestablishment procedure.
  • the UE recovers the state before performing the RRC connection reestablishment procedure and guarantees the continuity of the service to the maximum.
  • Subscriber and equipment traces provide very detailed information at the call level for one or more specific mobiles. This data can be an additional source of information for performance measurement and also allow for more advanced monitoring and optimization operations. Unlike performance measurements, which are always sources of information, traces can be activated at the request / needs of the user for a limited time period for specific analysis purposes. Tracking includes determining root cause of malfunctioning mobile, improved troubleshooting, optimizing resource usage and quality, controlling radio frequency (RF) coverage, improving capacity, analyzing dropouts, core network Network) and UTRAN play a very important role in operations such as UMTS procedure checks.
  • RF radio frequency
  • Log data on the interface at the call level for a service initiated by a particular user eg International Mobile Subscriber Identity
  • mobile type eg International Mobile Equipment Identity (IMEI) or IMEIS and Software Version (IMEISV)
  • performance measures such as recognition of end-user QoS during a call (eg requested QoS vs. provided QoS), correlation between protocol messages and RF measurements, or interoperability with specific mobile vendors.
  • Information that cannot be obtained can be obtained. Tracking data is collected at the TCE.
  • MDT Minimization of Driving Tests
  • MDT allows conventional operators to perform measurements and report the results to the terminal instead of using a drive test to measure the quality of the cell using a car. . Coverage depends on the location of the base station, the layout of the surrounding buildings, and the environment of use of the user. Therefore, the operator needs to periodically drive test, which is expensive and resource-intensive. In order to overcome this disadvantage, the MDT is proposed that the operator measures the coverage using the terminal.
  • the operator synthesizes the MDT measurement values received from the various terminals to create a coverage map that shows the distribution of service availability and quality of service over the entire area in which the operator provides the service. It can be utilized. For example, if a coverage problem of a specific area is reported from the terminal, the operator may expand the coverage of the corresponding area cell by increasing the transmission power of the base station providing the service of the corresponding area. In this way, the time and cost of network optimization can be minimized.
  • MDT is built on a framework of tracing, one of the operator's tools for operation, administration, and maintenance (OAM).
  • OAM operator's tools for operation, administration, and maintenance
  • the tracking function provides the operator with the ability to track and log the behavior of the terminal, thus making it possible to determine the main cause of terminal-side malfunction.
  • Traced data is collected on the network, which is called a trace collection entity (TCE).
  • TCE trace collection entity
  • Tracking functionality used for MDT includes tracking based signaling and management based tracking functions. Tracking function based signaling is used for activating an MDT task for a specific terminal, whereas tracking function based management is used for activating an MDT task without being limited to a specific terminal.
  • MDT can be divided into two types, the logged MDT (immediate MDT) and the immediate MDT (immediate MDT) according to whether the terminal reports the measured and stored log data in real time or in real time.
  • the logged MDT is a method in which the terminal logs the data after the MDT measurement and then transmits the data to the network.
  • MDT is a method of measuring MDT and sending the data directly to the network. According to the logged MDT, the UE performs the MDT measurement in the RRC idle state, but immediately according to MDT, the UE performs the MDT measurement in the RRC connected state.
  • FIG. 8 is a flowchart illustrating a method of performing a logged MDT.
  • the terminal receives a logged measurement configuration (S810).
  • the logged measurement configuration may be included in the RRC message and transmitted as a downlink control channel.
  • the logged measurement setting may include at least one of a TCE ID, reference time information for logging, logging duration, logging interval, and area configuration. It may include.
  • the logging interval indicates an interval for storing the measurement result.
  • the logging duration indicates the duration for which the terminal performs the logged MDT.
  • the reference time indicates a time that is a reference for the duration of performing the logged MDT.
  • the area setting indicates the area where the terminal is requested to perform logging.
  • the validity timer refers to the lifetime of the logged measurement setup, which can be specified by information about the logging duration.
  • the duration of the validity timer may indicate not only the valid lifetime of the logged measurement configuration but also the validity of the measurement results possessed by the terminal.
  • the procedure in which the UE sets the measured measurement and the related procedures are performed is called a configuration phase.
  • the terminal When the terminal enters the RRC idle state (S821), the terminal logs the measurement result while the validity timer is driven (S822).
  • the measurement result value may include RSRP, RSRQ, received signal code power (RSCP), Ec / No, and the like.
  • RSRP received signal code power
  • Ec / No information logging the measurement result
  • a temporal interval during which the UE logs at least one measurement result is called a logging phase.
  • the terminal performing the logged MDT based on the logged measurement configuration may vary depending on the location of the terminal.
  • FIG. 9 is a diagram illustrating an example of a logged MDT according to a logging region.
  • the network may set a logging area which is an area where the terminal should log.
  • the logging area may be represented by a cell list or a tracking area / location area list.
  • the terminal stops logging when it leaves the logging area.
  • the first area 910 and the third area 930 are areas set as logging areas, and the second area 920 is areas where logging is not allowed.
  • the terminal logs in the first area 910 but does not log in the second area 920.
  • the terminal moves from the second area 920 to the third area 930, the terminal performs logging again.
  • FIG. 10 is a diagram illustrating an example of a logged MDT according to a RAT change.
  • the UE performs logging only when it is camped on the RAT receiving the logged measurement configuration, and stops logging at another RAT. However, the UE may log cell information of another RAT in addition to the staying RAT.
  • the first region 1010 and the third region 1030 are E-UTRAN regions, and the second region 1020 is a UTRAN region.
  • the logged measurement settings are received from the E-UTRAN.
  • the terminal enters the second region 1020, the terminal does not perform the MDT measurement.
  • the terminal when the terminal enters the RRC connection state (831) and there is a logged measurement to report, the terminal informs the base station that there is a logged measurement to report (S832).
  • the terminal may inform the base station that there is a logged measurement when the RRC connection is established, the RRC connection is re-established, or the RRC connection is reconfigured.
  • the terminal performs the handover it may be notified that there is a logged measurement in the handover target cell.
  • Informing the base station that there is a logged measurement may include transmitting a logged measurements available indicator, which is indication information indicating that there is a logged measurement, in an RRC message transmitted by the terminal to the base station.
  • the RRC message may be an RRC connection setup complete message, an RRC connection reestablishment complete message, an RRC reset complete message, or a handover complete message.
  • the base station When the base station receives a signal indicating that there is a logged measurement from the terminal, it requests the terminal to report the logged measurement (S833). Requesting to report the logged measurement may include transmitting a logged measurement report request parameter related to the information indicating this in an RRC message.
  • the RRC message may be a UE information request message.
  • reporting the logged measurements to the base station may include sending a logged measurements report including the logged measurements to the base station in an RRC message.
  • the RRC message may be a UE information report message.
  • the terminal may report the entire logged measurement that the terminal has to the base station or report a part thereof to the base station. If some are reported, some reported may be discarded.
  • the terminal informs the base station that there is a logged measurement, is requested to report from the base station, and accordingly, a process in which the process of reporting the logged measurement is performed is called a reporting phase.
  • the measurement by the terminal while the logged MDT is performed is mainly related to the wireless environment.
  • MDT measurements may include the cell identifier, the signal quality and / or signal strength of the cell.
  • MDT measurements can include measurement time and measurement location.
  • the following table exemplifies contents logged by the terminal.
  • Information logged at different logging points may be stored to be divided into different log entries as shown below.
  • 11 is a diagram illustrating an example of logged measurements.
  • the logged measurement includes one or more log entries.
  • the log entry includes a logging location, a logging time, a serving cell identifier, a serving cell measurement result, and a neighbor cell measurement result.
  • the logging position indicates the position measured by the terminal.
  • the logging time represents the time measured by the terminal.
  • Information logged at different logging times is stored in different log entries.
  • the serving cell identifier may include a cell identifier in layer 3, which is called a global cell identity (GCI).
  • GCI is a set of physical cell identity (PCI) and PLMN identifiers.
  • the terminal may analyze and log performance related indicators of the terminal in addition to the wireless environment. For example, throughput, erroneous transmission / reception rate, and the like may be included.
  • the aforementioned logging phase and reporting phase may exist multiple times within the logging duration (S841, S842).
  • the base station When the base station receives the reported measurement, it can record / store it in the TCE.
  • the terminal After the validity timer expires, that is, after the logging duration has elapsed, if the terminal has a logged measurement that has not yet been reported, the terminal performs a procedure for reporting it to the base station.
  • the phase in which all the procedures are carried out is called the post-reporting phase.
  • the terminal discards the measured measurement configuration after the end of the logging duration and starts a conservation timer. After the logging duration ends, the UE stops measuring the MDT. However, the measurements already logged are not discarded. The retention timer indicates the lifetime of the remaining logged measurements.
  • the UE If the UE enters the RRC connection state before the retention timer expires (S851), it is possible to report a logged measurement not yet reported to the base station. In this case, the above-described procedure for the logged measurement report may be performed (S852, S853, S854). When the retention timer expires, the remaining logged measurements can be discarded. When the base station receives the reported measurement, it can record / store it in the TCE.
  • the preservation timer may be set to the terminal in advance by being fixed to a predetermined value in the terminal.
  • the value of the retention timer may be 48 hours.
  • the value of the retention timer may be included in the logged measurement setting and transmitted to the terminal, or may be included in another RRC message and transmitted to the terminal.
  • the terminal may update the existing logged measurement settings with the newly acquired logged measurement settings.
  • the validity timer may be restarted from the time when the logged measurement setting is newly received.
  • logged measurements based on previously logged measurement settings may be discarded.
  • MDT is a diagram illustrating an example of an immediate MDT.
  • MDT is based on RRM (radio resource management) measurement and reporting mechanism, and additionally reports the information to the base station by adding information related to the location when reporting.
  • RRM radio resource management
  • the terminal receives an RRC connection reset message (S1210) and transmits an RRC connection reset complete message (S1220). Through this, the terminal enters the RRC connection state.
  • the terminal may receive the measurement setting through receiving the RRC connection reset message.
  • the measurement setting is received through an RRC connection reestablishment message. However, this may be included in another RRC message and transmitted.
  • the terminal performs measurement and evaluation in the RRC connection state (S1231) and reports the measurement result to the base station (S1232).
  • the measurement results may provide accurate location information, if possible, such as an example of global navigation satellite system (GNSS) location information.
  • GNSS global navigation satellite system
  • location measurement such as an RF fingerprint, it may provide neighbor cell measurement information that may be used to determine the location of the terminal.
  • the UE reports this failure event to the network when an RLF occurs or a handover failure occurs in order to support Mobility Robustness Optimization (MRO) of the network.
  • MRO Mobility Robustness Optimization
  • the UE may provide an RLF report to the eNB.
  • Radio measurements included in the RLF report can be used as potential reasons for failure to identify coverage problems. This information can be used to exclude such events from the MRO evaluation of intra-LTE mobility connection failures and to write those events as input to other algorithms.
  • the UE may generate a valid RLF report for the eNB after reconnecting in the idle mode. For this purpose, the UE stores the latest RLF or handover failure related information, and for 48 hours after the RLF report is retrieved by the network or after the RLF or handover failure is detected, the RRC connection ( Re-establishment and handover may indicate to the LTE cell that the RLF report is valid.
  • the UE maintains the information during state transition and RAT change, and indicates that the RLF report is valid again after returning to the LTE RAT.
  • the validity of the RLF report in the RRC connection establishment procedure indicates that the UE has been interrupted such as a connection failure and that the RLF report due to this failure has not yet been delivered to the network.
  • the RLF report from the terminal includes the following information.
  • E-CGI of the target cell of the last cell in case of RRL or handover that provided a service to the terminal. If the E-CGI is unknown, PCI and frequency information is used instead.
  • E-CGI of the cell that serviced the terminal when the last handover initialization for example when message 7 (RRC connection reset) was received by the terminal.
  • the eNB receiving the RLF failure from the terminal may forward the report to the eNB that provided the service to the terminal before the reported connection failure.
  • Radio measurements included in the RLF report can be used to identify coverage issues as a potential cause of radio link failure. This information can be used to exclude these events from the MRO assessment of intra-LTE mobility connection failures and send them back as input to other algorithms.
  • RLF reporting can be considered as part of the MDT.
  • Dealing with the non-availability measurement of a connection for a terminal has many aspects, which deal with both common channels and connection procedures.
  • the terminal In order to inform the invalidity of the connection to the network, and thus to help optimize parameters for increasing the validity of the connection, the terminal performs accessibility measurement in case of connection establishment failure. In order to measure accessibility, the terminal performs the following logging.
  • a time stamp derived by using a relative timer that counts the time between failure and reporting is included.
  • the storage time for accessibility measurement is 48 hours.
  • Accessibility measures can be considered as part of the MDT.
  • the positioning function provides a means for determining the geographical location and / or speed of the terminal based on the measurement of the radio signal.
  • the location information may be requested and reported to the client by the client to which the terminal is coupled (e.g. application) or the client in or attached to the core network.
  • the location information is reported in a standard format, which is cell based or geographic coordinates with an estimated error (uncertainty) of the location and speed of the terminal and, if possible, the location method (or list of methods) used to obtain the location estimate. It can be implemented as.
  • the majority of activating or deactivating terminals in the network may be able to use the LoCation Service (LCS) feature without compromising the E-UTRAN's radio transmission or signaling capabilities.
  • LCS LoCation Service
  • the uncertainty of the location information depends on the method used, the location of the terminal in the coverage area and the movement of the terminal.
  • the various design options of the E-UTRAN system eg cell size, adjustable antenna technology, path loss estimates, timing accuracy, eNB surveys
  • allow network operators to provide a cost-effective and cost-effective solution for the market. effective) UE positioning method can be provided.
  • Positioning functions may be used internally by EPS, by value-added network services, by the terminal itself or over the network, and by third party services.
  • the function may also be necessary or used by additional emergency services, but location services may not be exclusively assigned for location services.
  • Positioning methods supported by E-UTRAN include network-assisted GNSS method, downlink positioning method, enhanced cell ID (E-CID) method, and uplink positioning (uplink). There may be a positioning method, and a hybrid positioning method in which one or more of the above-described methods are simultaneously applied.
  • the GNSS assisted network method is based on a terminal having a wireless receiver capable of receiving GNSS signals.
  • GNSS includes Global Positioning System (GPS), Galileo, Global Navigation Satellite System (GLONASS), Space Based Augmentation Systems (SBAS), and Quasi Zenith Satellite System (QZSS).
  • GPS Global Positioning System
  • GLONASS Global Navigation Satellite System
  • SBAS Space Based Augmentation Systems
  • QZSS Quasi Zenith Satellite System
  • different GNSSs may be used individually to determine the location of the UE, or at least one system may be used in combination.
  • the downlink positioning method is based on measured timing of downlink signals received from a plurality of eNBs to a UE.
  • the terminal measures the timing of the received signals using assistance data received from the positioning server.
  • the measurement result is used to determine the position of the terminal relative to the neighbor eNBs.
  • the location of the terminal is estimated based on the knowledge of the serving eNB of the terminal and the serving cell.
  • Information about the serving eNB and the serving cell may be obtained by paging, tracking area update or other methods.
  • the E-CID positioning method refers to a technique of using additional UE and / or E-UTRAN radio resources and other measurements to improve UE location estimation.
  • the E-CID positioning method utilizes some of the same measurements as the measurement control system on the RRC protocol, the UE is generally not expected to make additional measurements only for positioning. For example, no separate measurement setting or measurement control message is provided for positioning, and the terminal reports valid measurements that it has rather than required to take additional measurement actions.
  • the uplink positioning method also called Uplink Time Difference OF Arrival (UTDOA) is based on measurement timings of a plurality of Location Measurement Units (LMUs) for uplink signals transmitted from a terminal.
  • LMUs Location Measurement Units
  • the LMU measures signal reception timing using assistance data received from the positioning server, and the result of the measurement is used to estimate the position of the terminal.
  • FIG. 13 is a diagram illustrating an example of a structure of a wireless communication system to which positioning of a terminal is applied according to an embodiment of the present invention.
  • the MME may receive a request for a location service related to a specific target terminal from a specific entity (e.g. Global Mobile Location Center (GMLC) or terminal).
  • a specific entity e.g. Global Mobile Location Center (GMLC) or terminal.
  • IMS emergency call IP Multimedia Subsystem emergency call
  • the MME may decide to start location service for a specific target terminal. Accordingly, the MME sends a location service request to the Evolved-Service Mobile Location Center (E-SMLC).
  • E-SMLC Evolved-Service Mobile Location Center
  • the E-SMLC handles location service requests.
  • the E-SMLC may deliver assistance data to the target terminal to assist in terminal based and / or terminal assist positioning.
  • the E-SMLC may perform positioning of the target terminal.
  • the E-SMLC may deliver configuration data to selected location measurement units (LMUs). Accordingly, the E-SMLC may return the result of the location service to the MME. Meanwhile, when the location service is requested by an entity other than the MME (UE or E-SMLC), the MME may return the result to the corresponding entity.
  • LMUs location measurement units
  • SULP Location Platform is a Secure User Plane Location (SUPL) entity responsible for positioning on a user plane.
  • location related functions are provided, and such functions may be appropriately distributed and implemented in the structure of FIG. 13. Meanwhile, referring to FIG. 14, location service related operations that may be performed between such entities.
  • FIG. 14 is a diagram illustrating various procedures for location service according to an embodiment of the present invention.
  • the MME When the MME receives a location service request when the terminal is in the ECM-IDLE state, the MME performs a network-induced service request to establish a signaling connection with the terminal and allocate a specific eNB. It is assumed that the terminal enters the connected state before the various procedures shown in FIG. 14 are started.
  • the location service is started by a location service request of a specific entity (S1410).
  • the location service request may be initiated as follows.
  • the terminal may request a location service (e.g. positioning or support data delivery) to the serving MME on the NAS level (S1410a).
  • a location service e.g. positioning or support data delivery
  • a specific entity in an Evolved Packet Core (EPC) such as GMLC may request a location service (e.g. positioning) for a target terminal to the serving MME (S1410b).
  • the serving MME for the target terminal determines whether the location service is necessary, and if necessary, may request the location service itself (S1410c). This may be for positioning the terminal at a specific location or for emergency calls.
  • the MME forwards the location service request to the E-SMLC (S1420).
  • the E-SMLC performs a location service procedure in response to the location service request (S1430).
  • the E-SMLC may perform a location service procedure with the serving eNB of the terminal (S1430a). This may include acquiring positioning measurements or assistance data.
  • the E-SMLC may perform a location service procedure with the UE (S1430b). This may include obtaining location estimation or positioning measurements or delivering location assistance data to the terminal.
  • uplink positioning e.g. UTDOA
  • the E-SMLC may perform location service procedures with one or more LMUs for the target UE (S1430c). This may include obtaining a positioning measurement.
  • the E-SMLC provides a location service response to the MME (S1440).
  • the location service response may include the necessary results and may include, for example, a location estimate for the indicator and / or terminal indicating success or failure.
  • the location service response is provided to the entity requesting the location service (S1450).
  • the MME may transmit a location service response to the terminal (S1450a).
  • the location service response may include a result requested or required, such as a location estimation of the terminal.
  • the MME may transmit a location service response to the corresponding entity (S1450b).
  • the location service response may include a result requested or required, such as a location estimation of the terminal.
  • the location service response received from the E-SMLC may be used for location service (S1450c).
  • the E-SMLC may interact with elements in the E-UTRAN to obtain measurement information supporting one or more position methods for all terminals.
  • the E-SMLC may acquire location related information to support the downlink position method, and for this purpose, the E-SMLC may interact with an accessible eNB from an MME that is signaling with the E-SMLC.
  • the information may include timing information for the eNB that is related to absolute GNSS time or timing for other eNBs.
  • the information may include information about a supported cell, and for example, a Positioning Reference Signal (PRS) schedule may be included. Signaling access between the E-SMLC and the eNB may be performed through the MME maintaining signaling access with the E-SMLC and the eNB.
  • PRS Positioning Reference Signal
  • the E-SMLC may interact with the serving eNB of the UE to retrieve target UE configuration information for supporting the uplink positioning method.
  • the configuration information may include information required from the LMU to obtain uplink time measurement.
  • the E-SMLC may indicate to the serving eNB that it needs to transmit an SRS signal to the terminal for uplink positioning. If the requested resource is not available, the eNB may allocate another resource and report the resource allocation to the E-SMLC.
  • the E-SMLC may also request the LMU to perform uplink time measurements and report the results.
  • the terminal may transmit a signal required for uplink based terminal position measurement. It can also measure downlink signals from other resources, such as E-UTRAN and other GNSS systems. The measurement method may be determined based on the selected positioning method.
  • the terminal may access the location service application, including the location service application, or via communication with the network or other applications present in the terminal.
  • the location service application includes the measurement and calculation functions required to determine the location of the terminal with or without the support of the required network.
  • the terminal may include an independent positioning function (e.g. GPS) and may report the result independently of the E-UTRAN transmission.
  • a terminal having an independent positioning function may utilize assistance information obtained from a network.
  • An eNB is an element of an E-UTRAN network that provides measurement results for location estimation and can measure radio signals for a target terminal and send the measurements to the E-SMLC.
  • the eNB may perform measurement in response to the request, or may automatically perform measurement and reporting when a change in a regular or specific radio state occurs.
  • the eNB may configure the terminal to transmit periodic SRS.
  • the E-SMLC manages the support of location services for the target terminal, which includes positioning of the terminal and delivery of assistance data to the terminal.
  • the E-SMLC may interact with the serving eNB of the terminal to obtain location measurements for the terminal. Measurement includes uplink measurement by eNB and downlink measurement by UE. Among them, downlink measurement by the UE may be provided to the eNB through another function such as support of handover.
  • the E-SMLC enables the uplink positioning method and instructs the serving eNB that the UE needs to instruct the UE to transmit the SRS signal in order to obtain the target UE configuration data necessary for the LMU to calculate the timing of the signal. Interact with The E-SMLC may select the set of LMUs used for UTDOA positioning. The E-SMLC may interact with the selected LMUs to request timing measurements.
  • the E-SMLC may interact with the target terminal to convey assistance data when requested or to obtain a location estimate.
  • the E-SMLC may determine the positioning method to be used based on factors including the LCS client type, the required QoS, the terminal positioning capability, the positioning capability of the eNB, and the like. Accordingly, the E-SMLC may apply the positioning method to the terminal and / or serving eNB. Positioning methods include position estimation for UE-based positioning methods and / or position measurements for UE-assisted and network-based positioning methods. The E-SMLC may combine all received results and determine a single location estimate for the target terminal. Additional information such as the accuracy and speed of the position estimate may also be determined.
  • the LMU performs the measurements and passes the measured results to the E-SMLC. All position measurements obtained by the LMU can be provided to the requested E-SMLC.
  • the terminal positioning request may involve measurement by a plurality of LMUs.
  • the aforementioned positioning methods can be applied to determine the location of logging. If the location information measured for the location measurement by the terminal or the network indicates the actual physical location, the location information may be immediately correlated with the logged measurement. On the other hand, if the measured location information does not directly indicate the actual physical location, but consists of information in a format that can be converted to indicate the actual physical location through a particular process, the location information is not actually correlated with the logged measurement. Processing to indicate the position needs to be made.
  • the network node collecting the log What is needed is a way to correlate the received location information with a log.
  • the present invention proposes a location information processing method that allows correlation of logged measurements with location information.
  • the logged measurements referred to below are assumed to collectively refer to a single measurement result and / or a set of logged measurement results obtained via MDT and / or logged MDT immediately.
  • 15 is a flowchart illustrating a method of processing location information according to an embodiment of the present invention.
  • the method for processing location information proposed by the present invention acquires location information (S1510), determines and / or determines the type of location information (S1520), and processes location information based on the location information type. And correlating the position information and the logged measurement (S1540).
  • Each step of configuring the location information processing method may be performed by at least one or more network entities, that is, at least one or more terminals and network nodes.
  • the network entity acquiring the location information includes a location information measuring node, a network entity determining the type of location information, a location information type determining node, a node processing location information based on the location information type, a location information calculating node, and a location information. And a log collection node for collecting and correlating the logged measurements. Meanwhile, one network entity may perform more than one node function.
  • the location information measurement node transmits the measured location information to the location information type determination node.
  • the location information measurement node may transmit identification information identifying data having correlation with the location information together with the obtained location information to the location information type determination node.
  • the data correlated with the location information may be a logged measurement.
  • the location information measuring node may be a terminal or a base station.
  • the location information type may be classified according to whether the location information itself can indicate the actual location of the terminal. For example, although the actual location of the terminal cannot be directly indicated, the type of location information in which the location of the terminal can be indicated through processing based on additional information, and the location information indicating the actual location of the terminal directly. There may be a type of.
  • the type of location information requiring additional information may be location information measured based on the OTDOA positioning method performed by the terminal, or may be location information measured based on the UTDOA positioning method performed by the base station.
  • the location information of the type directly indicating the actual location of the terminal may be location information measured through the GNSS.
  • the former type is referred to as the first type
  • the latter type is referred to as the second type.
  • the location information type determination node transmits the location information to the log collection node when it is determined / determined that the acquired location information is the location information of the second type.
  • the location information type determination node may transmit identification information of data having correlation with the obtained location information together with the location information to the log collection node.
  • the location information type determination node transmits the location information to the location information calculation node when it is determined / determined that the acquired location information is the location information of the first type.
  • the location information calculation node may be a network node that has or knows additional information for processing the first type of location information.
  • the location information type determination node may transmit identification information of data having correlation with the location information together with the location information to the location information calculation node.
  • the location information type determination node and the location information measuring node which perform the above-described operation may be one network entity or may be individual network entities.
  • the location information type determination node may be a network node.
  • the location information type determination node may be a base station.
  • the location information type determination node may be a log collection node.
  • the location information calculation node When the location information calculation node receives the location information from the location information type determination node, the location information calculation node processes the received location information based on the additional information known or provided to the location information calculation node. The location information received through this may be processed to indicate the actual location of the terminal.
  • the location information calculation node transmits the processed location information to the log collection node.
  • an identifier of data having correlation with the processed location information may be transmitted together with the processed location information.
  • the data correlated with the processed location information may be a logged measurement.
  • the location information calculation node may be an E-SMLC.
  • the log collection node receives the location information and / or processed location information from the location information calculation node and / or the location information type determination node.
  • the log collecting node may receive an identifier of data having correlation with the location information together with the location information.
  • the data may be a logged measurement.
  • the time at which the log collecting node receives the location information may differ from the time at which the log collection node receives data having correlation with the location information.
  • the log collection node may determine that the received location information is correlated with some data through the data identifier transmitted along with the location information.
  • the log collecting node may further determine the type of the received location information, and if the type of the location information is the first type, transmit the location information to the location information calculation node and request to process the location information.
  • the log collection node may be a network node that collects logged measurements of the terminal or the base station.
  • the log collection node may be a TCE.
  • the log collection node may be a network node that collects and / or analyzes logged measurements.
  • 16 is a flowchart illustrating an example of a location information processing method according to an embodiment of the present invention.
  • the terminal performs a measurement based on the MDT, and transmits the logged measurement to the log collecting node according to the result (S1610).
  • the terminal transmits the logged measurement to the base station, and the base station transmits the logged measurement to the log collection node.
  • the terminal acquires location information that has a positional correlation with the logged measurement (S1620).
  • the terminal may use a downlink positioning method for obtaining location information.
  • the downlink positioning method may be an OTDOA technique.
  • the terminal transmits the location information to the base station (S1630).
  • the terminal may also transmit a log ID for identifying the logged measurement having correlation with the location information.
  • the base station determines and / or determines the type of location information received from the terminal (S1640).
  • the base station determines / determines whether the location information is of a type that directly indicates the location of the terminal (second type) or whether a specific data processing procedure is required to indicate the location of the terminal (first type). This may be determined according to the positioning technique used by the terminal to obtain location information. For example, when the terminal acquires the location information through the GNSS, the base station may determine / determine that the corresponding location information is the second type. When the terminal acquires the location information through the OTDOA, the base station may determine / determine that the location information is the first type.
  • the base station transmits the location information to the log collection node (S1650a).
  • the base station may send a log ID along with the location information to the log collection node that identifies the logged measurement that has correlation with the location information.
  • the base station transmits the location information to the location information calculation node (S1650b).
  • the base station may send a log ID along with the location information to the log collection node that identifies the logged measurement that has correlation with the location information.
  • the location information processing node processes the location information based on the additional information that is already present or signaled (S1660).
  • the location information processed through the process of the location information calculation node may directly indicate the location of the terminal.
  • the location information calculation node transmits the processed location information to the log collection node (S1670).
  • the location information calculation node may transmit the log ID along with the processed location information to the log collection node.
  • the log collecting node correlates the log ID with the location information and / or the processed location information (S1680). Through this, the log collecting node may determine the location where the logged measurement collected through the S1610 step is measured and / or logged.
  • 17 is a flowchart illustrating another example of the method for processing location information according to the embodiment of the present invention.
  • the terminal performs a measurement based on the MDT, and transmits the logged measurement to the log collection node according to the result (S1710).
  • the terminal transmits the logged measurement to the base station, and the base station transmits the logged measurement to the log collection node.
  • the terminal acquires location information that has a positional correlation with the logged measurement (S1720).
  • the terminal may use a downlink positioning method for obtaining location information.
  • the downlink positioning method may be an OTDOA technique.
  • the terminal determines and / or determines the type of the acquired location information (S1730).
  • the terminal determines / determines whether the location information is a type directly indicating the location of the terminal (second type) or a type (first type) in which a specific data processing process is required to indicate the location of the terminal. This may be determined according to the positioning technique used by the terminal to obtain location information. For example, when the terminal acquires the location information through the GNSS, the terminal may determine / determine that the corresponding location information is the second type. When the terminal acquires the location information through OTDOA, the terminal may determine / determine that the corresponding location information is the first type.
  • the terminal transmits the location information to the log collection node (S1740a).
  • the terminal may transmit a log ID identifying the logged measurement having correlation with the location information together with the location information to the log collection node.
  • the terminal transmits the location information and / or log ID to the base station, and the base station transmits the location information and / or log ID to the log collection node.
  • the terminal transmits the location information to the location information calculation node (S1740b).
  • the terminal may transmit a log ID identifying the logged measurement having correlation with the location information together with the location information to the log collection node.
  • the terminal transmits the location information and / or log ID to the base station, and the base station transmits the location information and / or log ID to the location information calculation node.
  • the location information processing node processes the location information based on the additional information that is already present or signaled (S1750).
  • the location information processed through the process of the location information calculation node may directly indicate the location of the terminal.
  • the location information calculation node transmits the processed location information to the log collection node (S1760).
  • the location information calculation node may transmit the log ID along with the processed location information to the log collection node.
  • the log collecting node correlates the log ID with the location information and / or the processed location information (S1770). Through this, the log collection node may determine the location where the logged measurement collected through the step S1710 is measured and / or logged.
  • FIG. 18 is a flowchart illustrating still another example of a method for processing location information according to an embodiment of the present invention.
  • the terminal performs measurement based on the MDT, and transmits the logged measurement to the log collection node according to the operation (S1810).
  • the terminal transmits the logged measurement to the base station, and the base station transmits the logged measurement to the log collection node.
  • the base station acquires location information that has a positional correlation with the logged measurement (S1820).
  • the base station may use the uplink positioning method for obtaining location information.
  • the uplink positioning method may be a UTDOA technique.
  • the base station determines and / or determines the type of location information received from the terminal (S1830).
  • the base station determines / determines whether the location information is of a type that directly indicates the location of the terminal (second type) or whether a specific data processing procedure is required to indicate the location of the terminal (first type). This may be determined according to the positioning technique used by the terminal to obtain location information. For example, when the terminal acquires the location information through the GNSS, the base station may determine / determine that the corresponding location information is the second type. When the terminal acquires the location information through UTDOA, the base station may determine / determine that the location information is the first type.
  • the base station transmits the location information to the log collection node (S1840a).
  • the base station may send a log ID along with the location information to the log collection node that identifies the logged measurement that has correlation with the location information.
  • the base station transmits the location information to the location information calculation node (S1840b).
  • the base station may send a log ID along with the location information to the log collection node that identifies the logged measurement that has correlation with the location information.
  • the location information processing node processes the location information based on additional information that is already present or signaled (S1850).
  • the location information processed through the process of the location information calculation node may directly indicate the location of the terminal.
  • the location information calculation node transmits the processed location information to the log collection node (S1860).
  • the location information calculation node may transmit the log ID along with the processed location information to the log collection node.
  • the log collecting node correlates the log ID with the location information and / or the processed location information (S1870). Through this, the log collection node may determine the location where the logged measurement collected through the step S1810 is measured and / or logged.
  • FIG. 19 is a flowchart illustrating still another example of a method for processing location information according to an embodiment of the present invention.
  • the terminal performs a measurement based on the MDT, and transmits the logged measurement to the log collection node (S1910).
  • the terminal transmits the logged measurement to the base station, and the base station transmits the logged measurement to the log collection node.
  • the terminal acquires location information that has a positional correlation with the logged measurement (S1920).
  • the terminal may use a downlink positioning method for measuring location information.
  • the downlink positioning method may be an OTDOA technique.
  • the terminal transmits the location information to the base station (S1930).
  • the terminal may also transmit a log ID for identifying the logged measurement having correlation with the location information.
  • the base station transmits the location information to the log collection node (S1940). In transmitting the location information to the base station, the base station may transmit a log ID together.
  • the log collecting node determines and / or determines the type of location information received from the base station (S1950).
  • the base station determines / determines whether the location information is of a type that directly indicates the location of the terminal (second type) or whether a specific data processing procedure is required to indicate the location of the terminal (first type). This may be determined according to the positioning technique used by the terminal to obtain location information. For example, when the terminal acquires the location information through the GNSS, the log collecting node may determine / determine that the corresponding location information is the second type. When the terminal obtains the location information through the OTDOA, the log collecting node may determine / determine that the corresponding location information is the first type.
  • the log collecting node transmits the location information to the location information calculation node (S1960).
  • the location information processing node processes the location information based on the additional information that is already present or signaled (S1970).
  • the location information processed through the process of the location information calculation node may directly indicate the location of the terminal.
  • the location information calculation node transmits the processed location information to the log collection node (S1980).
  • the log collecting node correlates the log ID with the location information and / or the processed location information (S1990).
  • the log collecting node determines that the location information is the second type through step S1950, the log collecting node correlates the location information and the log ID independently of the steps S1960 to S1980, and thus the location where the logged measurement is measured and / or logged I can figure it out.
  • the log collecting node determines that the location information is the first type through step S1950, the log collecting node correlates the processed location information with the log ID following steps S1960 to S1980. This allows you to determine where logged measurements are measured and / or logged.
  • a logged measurement having a correlation with the location information acquired based on various location measurement methods may more accurately grasp the measured and / or logged location.
  • network optimization can be performed more efficiently through effective analysis of the measurement results included in the logged measurements.
  • FIG. 20 is a block diagram illustrating a wireless device in which an embodiment of the present invention is implemented. This device may implement the operation of each network entity performing the embodiments described above with reference to FIGS. 13-19.
  • the wireless device 2000 includes a processor 2010, a memory 2020, and a radio frequency unit 2030.
  • the processor 2010 implements the proposed functions, processes and / or methods.
  • the processor 2010 may be configured to obtain logged measurements through measurements and logging based on MDT.
  • the processor 2010 may be configured to obtain location information based on a positioning technique.
  • the processor 2010 may be set to determine the type of location information obtained.
  • the processor 2010 may determine whether to process the location information based on the type of the acquired location information, and thus may be configured to process the location information.
  • the processor 2010 may be configured to correlate the logged measurements with the location information and / or the processed location information.
  • the processor 2010 may be configured to implement an operation of each network entity according to the above-described embodiment through FIGS. 13 to 19.
  • the RF unit 2030 is connected to the processor 2010 to transmit and receive a radio signal.
  • the processor 2010 and the RF unit 2030 may be implemented to transmit and receive wireless signals according to at least one communication standard.
  • the RF unit 2030 may include at least one transceiver capable of transmitting and receiving wireless signals.
  • the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
  • the RF unit may include a baseband circuit for processing a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in memory and executed by a processor.
  • the memory may be internal or external to the processor and may be coupled to the processor by various well known means.

Abstract

L'invention a trait à un procédé destiné au traitement d'informations de localisation par un nœud de réseau dans un système de communication sans fil. Ledit procédé comprend l'acquisition d'informations de localisation sur un terminal, l'acquisition d'un identificateur de journal servant à identifier une mesure journalisée relative aux informations de localisation sur le terminal, la détermination du type des informations de localisation, et, si les informations de localisation sont d'un premier type, la transmission des informations de localisation du premier type et de l'identificateur de journal à un nœud de calcul d'informations de localisation.
PCT/KR2013/000368 2012-01-17 2013-01-17 Procédé destiné au traitement d'informations de localisation dans un système de communication sans fil et appareil pour la prise en charge de ce procédé WO2013109064A1 (fr)

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US14/372,184 US20150024788A1 (en) 2012-01-17 2013-01-17 Method for processing location information in wireless communication system and apparatus for supporting same
KR1020147019470A KR101637797B1 (ko) 2012-01-17 2013-01-17 무선 통신 시스템에서 위치 정보 처리 방법 및 이를 지원하는 장치

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US61/587,134 2012-01-17

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