WO2013169030A1 - 무선 통신 시스템에서 상관성 유효 평가 및 이를 기반으로 한 보고 방법 및 장치 - Google Patents
무선 통신 시스템에서 상관성 유효 평가 및 이를 기반으로 한 보고 방법 및 장치 Download PDFInfo
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- WO2013169030A1 WO2013169030A1 PCT/KR2013/004078 KR2013004078W WO2013169030A1 WO 2013169030 A1 WO2013169030 A1 WO 2013169030A1 KR 2013004078 W KR2013004078 W KR 2013004078W WO 2013169030 A1 WO2013169030 A1 WO 2013169030A1
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- location information
- measurement result
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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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
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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
- H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to wireless communication, and more particularly, to a method for evaluating the validity of correlation between location information and measurement results, and a reporting method and apparatus based thereon.
- 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
- the network obtains measurement results from the terminal.
- the network may acquire location information related to the measurement result together from the terminal to optimize network performance more efficiently.
- Operators can acquire measurement results and location information by using a terminal for network optimization. This is called a Minimization of Driving Test (MDT).
- MDT Minimization of Driving Test
- the terminal performs positioning to obtain location information related thereto while acquiring a measurement result.
- the location information may indicate the measurement position of the terminal performing the measurement relatively accurately.
- the acquisition time of the location information is different from the acquisition time of the measurement result, the correlation between the location information and the measurement result is lowered, which may cause a problem in that the measurement location of the terminal is not accurately indicated by the location information.
- the purpose of providing the location information of the measurement terminal is the performance optimization of the network, providing location information that is not correlated with the measurement result may rather hinder the original purpose.
- the present invention has been made in an effort to provide a method and apparatus for evaluating validity of a correlation between location information and a measurement result in a wireless communication system and reporting the same based on the correlation.
- a reporting method performed by a terminal in a wireless communication system obtains a measurement result at a first time point, obtains position information at a second time point, determines a correlation between the position information and the measurement result, evaluates the validity of the correlation, and calculates the measurement result. And transmitting the containing report message to the base station. If it is determined by the correlation validity evaluation that the location information has a high correlation to the measurement result, the method further includes transmitting the location information to the base station.
- Determining the correlation may include calculating the time interval between the first time point and the second time point as the correlation.
- Evaluating the validity of the correlation compares the time interval with a particular time reference value and if the time interval is less than the specific time reference value, determining that the location information has a high correlation to the measurement result. It may include.
- the determining of the correlation may include calculating the distance interval between the position of the terminal at the first time point and the position of the terminal at the second time point as the correlation.
- the distance section is calculated as in the following equation. D mp is the distance section, T m is the first time point, T p is the second time point and v p is the speed of the terminal.
- Evaluating the validity of the correlation includes comparing the distance interval with a specific distance reference value and determining that the location information has a high correlation with the measurement result if the distance interval is less than the distance reference value. can do.
- the speed may be a speed of the terminal measured at the first time point.
- the speed may be a speed of the terminal measured at the second time point.
- the speed may be an average value of the speed of the terminal measured at the first time point and the speed of the terminal measured at the second time point.
- the speed may be set to a specific speed value corresponding to the estimated mobility state for the terminal.
- a wireless device operating in a wireless communication system includes a Radio Frequency (RF) unit for transmitting and receiving radio signals and a processor operatively coupled to the RF unit.
- the processor obtains a measurement result at a first time point, obtains position information at a second time point, determines a correlation between the position information and the measurement result, evaluates the validity of the correlation, and includes the measurement result. Set to transmit a report message to the base station. If it is determined by the correlation validity evaluation that the location information has a high correlation to the measurement result, the processor is set to further perform transmitting the location information to the base station.
- RF Radio Frequency
- the terminal when the terminal is required to report on the measurement result, the terminal is a network together with the measurement result and the location information only when the location information has a high correlation with the measurement result Can be reported as
- the present invention has proposed a correlation validity evaluation method for more accurately reporting the information on the location of the terminal at the time of obtaining the measurement result to the network.
- the present invention was able to report if the position information obtained after reporting the measurement result has a high correlation with the measurement result.
- the network can obtain location information that is more correlated with the measurement results, and can achieve more efficient 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 view showing a position estimation method according to an embodiment of the present invention.
- 16 is a diagram illustrating an example of a reporting method according to an embodiment of the present invention.
- FIG 17 shows another example of a reporting method according to an embodiment of the present invention.
- FIG. 18 is a diagram illustrating still another example of a reporting method according to an embodiment of the present invention.
- FIG. 19 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 user 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 control 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).
- PLMN public land mobile network
- PLMN is a network deployed and operated by mobile network operators. Each mobile network operator runs one or more PLMNs. Each PLMN may be identified by a mobile country code (MCC) and a mobile network code (MCC). The PLMN information of the cell is included in the system information and broadcasted.
- MCC mobile country code
- MCC mobile network code
- PLMN selection In PLMN selection, cell selection and cell reselection, various types of PLMNs may be considered by the terminal.
- HPLMN Home PLMN
- MCC Mobility Management Entity
- Equivalent HPLMN A PLMN that is equivalent to an HPLMN.
- Registered PLMN A PLMN that has successfully completed location registration.
- ELMN Equivalent PLMN
- Each mobile service consumer subscribes to HPLMN.
- HPLMN When a general service is provided to a terminal by HPLMN or EHPLMN, the terminal is not in a roaming state.
- a service is provided to a terminal by a PLMN other than HPLMN / EHPLMN, the terminal is in a roaming state, and the PLMN is called a VPLMN (Visited PLMN).
- 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 terminal registered in the network should be reachable by the network at all times. If the terminal is in the ECM-CONNECTED state (same as RRC connected state), the network recognizes that the terminal is receiving the 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.
- 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.
- 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 in which the UE is camping
- Inter-frequency cell reselection Reselects a cell having a center frequency different from 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 cell reselection priority provided through broadcast signaling may be referred to as common priority, and the cell reselection priority set by the network for each terminal may be referred to as a dedicated priority.
- the terminal may also receive a validity time associated with the dedicated priority.
- the terminal starts a validity timer set to the validity time received together.
- the terminal applies the dedicated priority in the RRC idle mode while the validity timer is running.
- the validity timer expires, the terminal discards the dedicated priority and applies the public priority again.
- the network may provide the UE with a parameter (for example, frequency-specific offset) used for cell reselection for each frequency.
- a parameter for example, frequency-specific offset
- the network may provide the UE with a neighboring cell list (NCL) used for cell reselection.
- 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.
- 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.
- R s is the ranking indicator of the serving cell
- R n is the ranking indicator of the neighbor cell
- Q meas s is the quality value measured by the UE for the serving cell
- Q meas n is the quality measured by the UE for the neighbor cell
- Q hyst is a hysteresis value for ranking
- Q offset is an offset between two cells.
- the terminal may alternately select two cells.
- Q hyst is a parameter for giving hysteresis in cell reselection to prevent the UE from reselecting two cells alternately.
- the UE measures R s of the serving cell and R n 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.
- RLM Radio Link Monitoring
- the terminal monitors the downlink quality based on a cell-specific reference signal to detect the downlink radio link quality of the PCell.
- the UE estimates the downlink radio link quality for PCell downlink radio link quality monitoring purposes and compares it with thresholds Qout and Qin.
- the threshold Qout is defined as the level at which the downlink radio link cannot be stably received, which corresponds to a 10% block error rate of hypothetical PDCCH transmission in consideration of the PDFICH error.
- the threshold Qin is defined as a downlink radio link quality level that can be received more stably than the level of Qout, which corresponds to a 2% block error rate of virtual PDCCH transmission in consideration of PCFICH errors.
- RLF Radio Link Failure
- 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 message 7 (RRC connection reset) was received by the terminal for example, at the last handover initialization.
- 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 terminal mobility state will be described.
- the mobile station may not move to the neighboring cells in time and may fall into a service unavailable state. Therefore, if the value of the mobility-related parameters according to the speed of the terminal is optimized for the speed of the terminal, the movement of the terminal is well performed and the mobility performance is improved.
- MSE Mobility State Estimation
- scales parameters related to movement eg Treselection, TimeTotrigger
- the UE more efficiently selects / reselects / cells. A move such as a handover can be performed.
- the mobility state of the terminal may be divided into a high mobility state, a medium mobility state, and a normal mobility state. Each mobility state may be determined based on the number of times the handover is performed by the terminal and / or the number of times cell reselection is performed.
- the UE in the RRC_IDLE state performs cell reselection when a cell reselection criterion is satisfied. If the number of times that the UE performs cell reselection during the specific time interval T CRmax exceeds the first threshold value N CR_H , the mobility state of the terminal satisfies the condition of the high mobility state. On the other hand, unless the number of times performing a cell reselection during a particular time interval of a terminal (T CRmax) exceeds the second threshold (N CR_M) exceeds a first threshold (N CR_H), the mobility state of the terminal is medium The condition of the mobility state is satisfied.
- the mobility state of the terminal satisfies the condition of the general mobility state.
- the UE continuously performs cell reselection between two identical cells it may not be counted as the number of times cell reselection is performed.
- the UE in the RRC_CONNECTED state reports a measurement result and performs a handover when a specific condition is satisfied when measuring a neighbor cell. If the number of times that the terminal performs the handover during the specific time interval exceeds the first threshold, the mobility state of the terminal satisfies the condition of the high mobility state. On the other hand, if the number of times that the UE performs the handover during the specific time interval exceeds the second threshold and does not exceed the first threshold, the mobility state of the terminal satisfies the condition of the intermediate mobility state. If the number of times that the terminal performs the handover during the specific time interval does not exceed the second threshold, the mobility state of the terminal satisfies the condition of the general mobility state.
- the terminal When the terminal in the RRC_IDLE or RRC_CONNECTED state detects that the condition of the aforementioned mobility state is satisfied, the terminal may enter the corresponding mobility state. Entering the mobility state may be the terminal determines that its mobility state is the mobility state. However, when it is determined that neither the high mobility state condition nor the intermediate mobility state condition is satisfied during a specific time interval, the terminal may enter the general mobility state.
- 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 terminal In logging and / or reporting a measurement result by a request of a network or by the terminal itself, the terminal logs and transmits the location information together with the measurement result only when the location information is obtained before logging or reporting the measurement result. You can report it.
- the terminal acquires the location information after logging and reporting the measurement result, the terminal may not provide the location information to the network even if the corresponding location information has a high correlation with the measurement result. As a result, the network may not be able to obtain location information for the reported measurement results.
- the terminal when logging and / or reporting the measurement result, the terminal continuously maintains a high correlation with the measurement result corresponding to the previously obtained location information. Can't decide if you have When the terminal logs and / or reports the location information together with the measurement result, the network may acquire low correlation or irrelevant location information with respect to the measurement result.
- the correlation with the measurement result of the location information may vary according to the acquisition time of the location information.
- Such location information may not be reported to the network or may be reported regardless of the correlation, which may adversely affect the performance optimization of the network. Can be. Therefore, the present invention evaluates the validity of the correlation between the location information and the measurement result, and proposes a reporting method performed based on the evaluated correlation.
- 15 is a flowchart illustrating a method of reporting a measurement result according to an exemplary embodiment of the present invention.
- the terminal determines the correlation between the obtained measurement result and the location information (S1510).
- the terminal may determine the correlation between the measurement result and the location information only when the acquisition time of the measurement result and the acquisition time of the location information are different. This is because it may be unnecessary to evaluate the validity of the bilateral correlation when the measurement result and the position information are obtained at the same time.
- Correlation between the measurement result and the location information may be determined differently according to the effectiveness evaluation criteria.
- the correlation between the measurement result and the location information may be a time interval between an acquisition time of the measurement result and an acquisition time of the location information.
- the terminal may basically acquire time-related information regarding the acquisition time of the measurement result and the acquisition time of the location information.
- the larger the time interval between the acquisition of the measurement result and the acquisition of the location information the higher the possibility that the position of the terminal indicated by the location information and the location of the point of time when the measurement result is acquired are different. Therefore, the time interval can properly reflect the correlation between the measurement result and the position information.
- the correlation between the measurement result and the location information may be a distance between the location of the terminal when acquiring the measurement result and the location of the terminal when acquiring the location information.
- the correlation defined by the distance may be determined only when the terminal can know the speed of the time when the measurement result is obtained and / or the location information or when the speed of the time can be estimated.
- the distance between the two views may be calculated through time information on both views and speed information of the terminal, which may be determined as in the following equation.
- D mp is the distance between the terminal position at the time of obtaining the measurement result and the position information acquisition time.
- T m is the time at which the measurement result was acquired.
- T p is the time at the time of obtaining the location information.
- v p is the speed of the terminal.
- the speed of the terminal may be the speed of the terminal at the time of obtaining the measurement result.
- the speed of the terminal may be the speed of the terminal at the time of obtaining the location information.
- the speed of the terminal may be any value (eg average value) between the two speeds.
- the speed of the terminal may be set to a specific speed value corresponding to the estimated mobility state.
- the specific speed value corresponding to the mobility state of the terminal may be preset in the terminal or may be signaled by the network.
- the specific value that maps to the mobility state can be implemented, for example, high mobility-60 km / s, medium mobility-40 km / s, and general mobility-20 km / s.
- the specific value to be mapped may be implemented as the higher the mobility state, the smaller the lower the mobility state.
- the terminal evaluates the validity of the determined correlation (S1520).
- Validity criteria may be provided for determining validity of correlation.
- the validity criterion may be a value preset in the terminal or a value signaled by the network. When signaled by the network, the validity criterion may be included in the system information and transmitted. When signaled by the network, the validity criterion may be included in the measurement setup and / or logged measurement setup and transmitted. The validity criterion may be transmitted in a message transmitted from the network during a procedure for establishing an RRC connection between the network and the terminal.
- the validity criteria may be provided in time intervals T valid .
- the UE may compare the absolute value of the difference between T m , which is a measurement result acquisition time point, and T p, which is a time point for obtaining location information, and T valid . If the absolute value of the difference is smaller than T valid , it may be determined that the correlation between the location information and the measurement result is high. On the other hand, if the absolute value of the difference is greater than T valid , it may be determined that the correlation between the location information and the measurement result is low.
- the validity criterion may be provided as the distance interval D valid .
- the terminal may compare the D mp and the D valid determined in step S1520. If D mp is smaller than D valid , it may be determined that the correlation between the location information and the measurement result is high. On the other hand, if D mp is greater than D valid , it may be determined that the correlation between the location information and the measurement result is low.
- the terminal may perform the evaluation of the validity of correlation with respect to time and distance. In this case, when the time interval is smaller than T valid and the distance interval is smaller than D valid , the terminal may determine that the correlation between the location information and the measurement result is high. On the other hand, if either one is larger than the reference value, the terminal may determine that the correlation between the location information and the measurement result is low.
- Specific measurement results may be determined and evaluated for correlation to two or more location information.
- the measurement result may be correlated and evaluated with respect to the position information obtained before the measurement result acquisition time and the position information obtained after the measurement result acquisition.
- the location information having the highest correlation may be selected.
- the correlation is determined as the time interval, position information having a smaller time interval with the measurement result may be selected.
- the correlation is determined as the distance section, location information that is determined to be shorter may be selected.
- location information having higher correlation may be selected by first applying either of them.
- a particular measurement result is determined and evaluated for correlation with two or more location information, and if both location information is evaluated to have a high correlation with the measurement result, more recently obtained location information may be selected as information having a higher correlation. have.
- the terminal logs and / or reports the measurement results and location information (S1530). If location information is acquired before logging and / or reporting the measurement result, the terminal may log and / or report the location information together with the measurement result. If the location information is obtained after logging and / or reporting of the measurement result, the terminal may additionally log the measurement result or provide it separately to the network. If there is more than one location information with high correlation, the location information with higher correlation may be selectively logged and / or reported.
- the terminal only logs and / or reports the measurement results (S1540). If the location information is obtained before logging and / or reporting of the measurement result, the terminal may log and / or report only the measurement result without the location information. If the location information is acquired after logging and / or reporting of the measurement result, the terminal may not perform an operation related to additional logging and reporting of the location information. Meanwhile, the terminal may log and / or report even location information having low correlation. In this case, the terminal may provide a separate indicator to the network to indicate that the location information has low correlation information.
- the measurement result may be a result according to the RRM measurement for the serving cell and / or neighbor cell.
- the measurement result may be a measurement result of terminal performance (e.g. delay, throughput, QoS, etc.) on the air interface.
- the measurement result may be a connection failure (e.g. radio link problem / failure, handover, handover failure, connection establishment failure, random access failure, etc.) occurring in the terminal.
- location information may be obtained using a GNSS device.
- Location information may be obtained using LTE Positioning Protocol (LPP).
- LTP LTE Positioning Protocol
- Location information may be obtained using an E-CID positioning scheme.
- the location information may be obtained using the SUPL method.
- 16 is a diagram illustrating an example of a reporting method according to an embodiment of the present invention.
- the method illustrated in FIG. 16 illustrates a method of evaluating the validity of correlation between location information related to measurement results to be logged and performing reporting of the logged measurements generated according to the terminal performing the logged MDT.
- the terminal receives a logged measurement setting including control information for performing logged MDT from the base station (S1610).
- the logged measurement setting may include validity criterion related information on which the terminal evaluates the validity of the correlation between the measurement result and the location information.
- the logged measurement setup may include a time interval criterion T valid and / or a distance interval criterion D valid .
- the terminal may perform the measurement according to the logged MDT.
- the terminal acquires the measurement result MR1 at time t 0 (S1620).
- the terminal may log the measurement result when it is obtained.
- the terminal acquires the location information P1 at time t 1 (S1630).
- the terminal may determine the correlation between the acquired position information P1 and the measurement result MR1 and evaluate the validity of the correlation.
- the terminal performs correlation validity evaluation according to a time interval.
- the terminal since the time interval of t 1 -t 0 is smaller than T valid , the terminal may determine that P1 has a high correlation with MR1, and log P1 together with MR1.
- the terminal may acquire and log the measurement result MR2 at time t 2 (S1640).
- the correlation between the measurement result MR2 and the position information P1 obtained before the acquisition and logging of the MR2 can be determined, and the validity of the correlation can be evaluated.
- the terminal since the time interval of t 2 -t 1 is greater than T valid , the terminal may determine that P1 has a low correlation with MR2 and may not log P1 with respect to MR2.
- the terminal acquires the location information P2 at time t 3 (S1650).
- the terminal may determine the correlation between the acquired location information P2 and the measurement result MR2 and evaluate the validity of the correlation. In this example, since the time interval of t 3 -t 2 is greater than T valid , the terminal may determine that P2 has a low correlation with MR2 and may not log P2 with respect to MR2.
- the terminal may select location information having a higher correlation with MR2. According to the illustrated example, it can be seen that the time interval t 3 -t 2 is shorter than the time interval t 2 -t 1 . Accordingly, the terminal may confirm that P2 is location information having a higher correlation with MR2, and log and report P2 with respect to MR2.
- the terminal reports the logged measurement in which the measurement result and the location information are logged to the network (S1660).
- the terminal reports the location information P1 at the time of reporting the measurement result because it has a high correlation with the measurement result MR1, but the location information P2 may have a low correlation with the measurement result MR2 and thus may not report the measurement result.
- the network can obtain relatively accurate location information P1 having a high correlation with MR1 as a result of the measurement.
- acquiring relatively inaccurate positional information P2 having low correlation with MR2 can be prevented.
- the network can be provided with only the exact location information required for operation, enabling efficient network performance optimization.
- FIG 17 shows another example of a reporting method according to an embodiment of the present invention.
- the method illustrated in FIG. 17 illustrates a method of evaluating the validity of correlation with the measurement result and reporting based on the evaluation result when the terminal immediately obtains the MDT.
- the terminal performs measurement and evaluation at time t 0 (S1710). If the measurement result MR1 satisfies the reporting condition, the terminal may report the measurement result MR1 (S1720).
- the terminal acquires the location information P1 at time t 1 (S1730).
- the terminal determines the correlation between the location information P1 and the measurement result MR1 and performs correlation validity evaluation.
- the terminal it is assumed that the terminal can know the information on the speed, the terminal knows the D valid , the distance interval reference.
- the terminal performs the correlation validity evaluation according to the distance section in order to evaluate the correlation validity.
- the terminal since the distance section between t 0 and t 1 is smaller than D valid which is a distance section criterion, the terminal may determine that the location information P1 has a high correlation with MR1 which is a previously reported measurement result. Therefore, the terminal may report the location information P1 to the base station (S1740).
- the terminal acquires the location information P2 at time t 2 (S1750), and performs measurement and evaluation at time t 3 (S1760).
- the terminal may determine whether to report the location information P2 together when reporting the measurement result.
- the terminal may determine the correlation between the location information P2 and the measurement result MR2 and perform correlation validity evaluation.
- the terminal performs the correlation validity evaluation according to the distance section in order to evaluate the correlation validity.
- the terminal since the distance interval between t 1 and t 2 is smaller than D valid as the distance interval criterion, the terminal may determine that the location information has a high correlation with the measurement result MR2 to be reported. Therefore, the terminal may report the location information P2 together with the base station when reporting the measurement result MR2 (S1770).
- the above reporting method enables a report to be reported if the location information has a high correlation with the measurement result, regardless of whether the acquisition time of the location information is after or before the related measurement result.
- the network can efficiently perform network performance optimization based on sufficient location information.
- FIG. 18 is a diagram illustrating still another example of a reporting method according to an embodiment of the present invention.
- FIG. 18 illustrates a method for evaluating validity of location information and reporting based on an evaluation result when the terminal acquires location information in reporting an RLF according to RLF generation.
- the terminal acquires a measurement result at time t 0 (S1810) and acquires position information at time t 1 (S1820).
- the terminal detects that an RLF has occurred at time t 2 (S1830).
- the UE determines whether to report the location information together with the measurement result.
- the terminal determines the correlation between the measurement result and the location information, and determines the validity of the correlation.
- the terminal may know the information on the speed, it is assumed that the terminal knows the time interval criterion T valid and the distance interval criterion D valid .
- the terminal performs correlation validity evaluation according to time intervals and distance sections in order to evaluate correlation validity.
- the terminal may determine that the location information has a high correlation with the measurement result.
- the UE may determine a point in time at which the RLF is detected, the position acquisition acquisition time correlation, and determine the validity of the correlation.
- the terminal performs correlation validity evaluation according to time intervals and distance sections in order to evaluate correlation validity. In this example, since the time intervals t 1 and t 2 are smaller than T valid and the distance interval is smaller than D valid , the terminal may determine that the location information has a high correlation with the RLF generation.
- the terminal transmits an RLF report message to the base station (S1840).
- the measurement result and location information having a high correlation with the occurrence of RLF may be included in the RLF report message and transmitted.
- the terminal performed the correlation validity evaluation between the location information, the measurement result, and the RLF generation, but this is only an example, and the correlation validity evaluation may be selectively performed on at least one of the measurement result and the RLF generation.
- correlation validity evaluation is performed on the time interval and the distance interval, correlation validity evaluation may be selectively performed on only one of the two.
- the speed of the terminal is assumed to be measured by the actual terminal, when the measurement cannot be made with respect to the actual speed, the estimated speed information may be used.
- the estimated speed may be a specific speed value mapped according to the mobility state of the terminal.
- the terminal when the terminal is required to report on the measurement result, the terminal is a network together with the measurement result and the location information only when the location information has a high correlation with the measurement result Can be reported as
- the present invention has proposed a correlation validity evaluation method for more accurately reporting the information on the location of the terminal at the time of obtaining the measurement result to the network.
- the present invention was able to report if the position information obtained after reporting the measurement result has a high correlation with the measurement result.
- the network can obtain location information that is more correlated with the measurement results, and can achieve more efficient network optimization.
- FIG. 19 is a block diagram illustrating a wireless device in which an embodiment of the present invention is implemented.
- the apparatus may be implemented to perform the reporting method according to the embodiment of the present invention described above with reference to FIGS. 15 to 18.
- the wireless device 1900 includes a processor 1910, a memory 1920, and a radio frequency unit 1930.
- the processor 1910 implements the proposed functions, processes, and / or methods.
- the processor 1910 may be configured to perform correlation determination and evaluation between the measurement result and the location information.
- the processor 1910 may be configured to report the location information together when reporting the measurement result based on the result of evaluating the validity of the correlation.
- the processor 1910 may be configured to implement the embodiments of the present invention described above with reference to FIGS. 16-18.
- the RF unit 1930 is connected to the processor 1910 to transmit and receive a radio signal.
- 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
Description
파라미터(세트) (Parameter(set)) |
설 명 (Description) |
서빙 셀 식별자 (Serving cell identity) | 서빙 셀의 글로벌 셀 식별자 (Global Cell Identity of Serving cell) |
서빙 셀의 측정된 결과(Measured results of serving cell) | 서빙 셀의 측정된 RSRP(Reference Signal Received Power) (Measured RSRP of serving cell) |
서빙 셀의 측정된 RSRQ(Reference Signal Received Quality) (Measured RSRQ of serving cell) |
|
이웃 셀의 측정된 결과(Measured results of neighbor cell) | 측정된 E-UTRA 셀의 셀 식별자, E-UTRA 셀의 측정된 결과 (Cell Identities of measured E-UTRA cells, Measured results of E-UTRA cells) |
측정된 UTRA 셀의 셀 식별자, UTRA 셀의 측정된 결과 (Cell Identities of measured UTRA cells, Measured results of UTRA cells) |
|
측정된 GERAN 셀의 셀 식별자, GERAN 셀의 측정된 결과 (Cell Identities of measured GERAN cells, Measured results of GERAN cells) |
|
측정된 CDMA 2000 셀의 셀 식별자, CDMA 2000 셀의 측정된 결과 (Cell Identities of measured CDMA 2000 cells, Measured results of CDMA 2000 cells) | |
타임 스탬프 (Time stamp) |
측정 결과를 로깅한 시점, {현재 시간 – 기준 타임 스탬프} 값이 초 단위로 계산됨. (The moment of logging measurement results, calculated as {current time minus absoluteTimeStamp} in seconds) |
위치 정보 (Location information) | 로깅 시점의 세부적인 위치 정보 (Detailed location information at the moment of logging) |
Claims (18)
- 무선 통신 시스템에서 단말에 의해 수행되는 보고 방법에 있어서, 상기 방법은,
제1 시점에서 측정 결과를 획득하고;
제2 시점에서 위치 정보를 획득하고;
상기 위치 정보 및 상기 측정 결과간 상관성을 결정하고;
상기 상관성의 유효성을 평가하고; 및
상기 측정 결과를 포함하는 보고 메시지를 기지국으로 전송하는 것;을 포함하되,
상기 상관성 유효 평가에 의해 상기 위치 정보가 상기 측정 결과에 대해 높은 상관성을 가지는 것으로 결정되면, 상기 방법은 상기 위치 정보를 상기 기지국으로 전송하는 것;을 더 포함함을 특징으로 하는 보고 방법. - 제 1항에 있어서, 상기 상관성을 결정하는 것은,
상기 제1 시점 및 상기 제2 시점간 시간 간격을 상기 상관성으로 산출하는 것을 포함함을 특징으로 하는 보고 방법. - 제 2항에 있어서,
상기 상관성의 유효성을 평가하는 것은,
상기 시간 간격을 특정 시간 기준 값과 비교하고; 및
상기 시간 간격이 상기 특정 시간 기준 값보다 작으면, 상기 위치 정보는 상기 측정 결과에 대해 높은 상관성을 가지는 것으로 결정하는 것;을 포함함을 특징으로 하는 보고 방법. - 제 4항에 있어서, 상기 상관성의 유효성을 평가하는 것은,
상기 거리 구간을 특정 거리 기준 값과 비교하고; 및
상기 거리 구간이 상기 거리 기준 값보다 작으면, 상기 위치 정보는 상기 측정 결과에 대해 높은 상관을 가지는 것으로 결정하는 것;을 포함함을 특징으로 하는 보고 방법. - 제 5항에 있어서,
상기 속력은 상기 제1 시점에서 측정된 상기 단말의 속력인 것을 특징으로 하는 보고 방법. - 제 5항에 있어서,
상기 속력은 상기 제2 시점에서 측정된 상기 단말의 속력인 것을 특징으로 하는 보고 방법. - 제 5항에 있어서,
상기 속력은 상기 제1 시점에서 측정된 상기 단말의 속력 및 상기 제2 시점에서 측정된 상기 단말의 속력의 평균 값인 것을 특징으로 하는 보고 방법. - 제 5항에 있어서,
상기 속력은 상기 단말에 대하여 추정된 이동성 상태(estimated mobility state)에 대응되는 특정 속력 값으로 설정되는 것을 특징으로 하는 보고 방법. - 무선 통신 시스템에서 동작하는 무선 장치에 있어서, 상기 무선 장치는,
무선 신호를 송신 및 수신하는 RF(Radio Frequency) 유닛; 및
상기 RF 유닛과 기능적으로 결합하여 동작하는 프로세서;를 포함하되, 상기 프로세서는,
제1 시점에서 측정 결과를 획득하고,
제2 시점에서 위치 정보를 획득하고,
상기 위치 정보 및 상기 측정 결과간 상관성을 결정하고,
상기 상관성의 유효성을 평가하고, 및
상기 측정 결과를 포함하는 보고 메시지를 기지국으로 전송하도록 설정되되,
상기 상관성 유효 평가에 의해 상기 위치 정보가 상기 측정 결과에 대해 높은 상관성을 가지는 것으로 결정되면, 상기 프로세서는 상기 위치 정보를 상기 기지국으로 전송하는 것을 더 수행하도록 설정된 것을 특징으로 하는 무선 장치. - 제 10항에 있어서, 상기 상관성을 결정하는 것은,
상기 제1 시점 및 상기 제2 시점간 시간 간격을 상기 상관성으로 산출하는 것을 포함함을 특징으로 하는 무선 장치. - 제 11항에 있어서,
상기 상관성의 유효성을 평가하는 것은,
상기 시간 간격을 특정 시간 기준 값과 비교하고; 및
상기 시간 간격이 상기 특정 시간 기준 값보다 작으면, 상기 위치 정보는 상기 측정 결과에 대해 높은 상관성을 가지는 것으로 결정하는 것;을 포함함을 특징으로 하는 무선 장치. - 제 13항에 있어서, 상기 상관성의 유효성을 평가하는 것은,
상기 거리 구간을 특정 거리 기준 값과 비교하고; 및
상기 거리 구간이 상기 거리 기준 값보다 작으면, 상기 위치 정보는 상기 측정 결과에 대해 높은 상관을 가지는 것으로 결정하는 것;을 포함함을 특징으로 하는 무선 장치. - 제 14항에 있어서,
상기 속력은 상기 제1 시점에서 측정된 상기 무선 장치의 속력인 것을 특징으로 하는 보고 방법. - 제 14항에 있어서,
상기 속력은 상기 제2 시점에서 측정된 상기 무선 장치의 속력인 것을 특징으로 하는 보고 방법. - 제 14항에 있어서,
상기 속력은 상기 제1 시점에서 측정된 상기 무선 장치의 속력 및 상기 제2 시점에서 측정된 상기 무선 장치의 속력의 평균 값인 것을 특징으로 하는 보고 방법. - 제 14항에 있어서,
상기 속력은 상기 무선 장치에 대하여 추정된 이동성 상태(estimated mobility state)에 대응되는 특정 속력 값으로 설정되는 것을 특징으로 하는 보고 방법.
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KR20220069993A (ko) * | 2019-09-24 | 2022-05-27 | 텔레호낙티에볼라게트 엘엠 에릭슨(피유비엘) | 디바이스의 위치를 결정하기 위한 방법, 시스템 및 통신 디바이스 |
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KR20150015457A (ko) | 2015-02-10 |
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KR20150018783A (ko) | 2015-02-24 |
US9432870B2 (en) | 2016-08-30 |
US20150133151A1 (en) | 2015-05-14 |
US9706424B2 (en) | 2017-07-11 |
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