WO2015041484A1 - 단말의 측정 보고 방법 및 이를 이용하는 단말 - Google Patents
단말의 측정 보고 방법 및 이를 이용하는 단말 Download PDFInfo
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- WO2015041484A1 WO2015041484A1 PCT/KR2014/008749 KR2014008749W WO2015041484A1 WO 2015041484 A1 WO2015041484 A1 WO 2015041484A1 KR 2014008749 W KR2014008749 W KR 2014008749W WO 2015041484 A1 WO2015041484 A1 WO 2015041484A1
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
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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
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/19—Connection re-establishment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
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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 a method for performing measurement report of a terminal in a mobile communication system and a terminal apparatus for the same.
- the International Telecommunication Union Radio communication sector (ITU-R) is working on the standardization of International Mobile Telecommunication (IMT) -Advanced, the next generation of mobile communication systems after the third generation.
- 3rd Generation Partnership Project is a system standard that meets the requirements of IMT-Advanced.
- Long Term Evolution is based on Orthogonal Frequency Division Multiple Access (OFDMA) / Single Carrier-Frequency Division Multiple Access (SC-FDMA) transmission.
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier-Frequency Division Multiple Access
- LTE-A LTE-Advanced
- LTE-A is one of the potential candidates for IMT-Advanced.
- Carrier aggregation is a technology that can form a broadband by aggregating a plurality of component carriers (CC) having a narrow band.
- the component carrier includes a downlink component carrier and an uplink component carrier.
- a cell may be defined as a pair of a downlink component carrier and an uplink component carrier or a downlink component carrier.
- carrier aggregation may be understood to aggregate a plurality of cells.
- carrier aggregation there is a primary cell in which the UE establishes an initial connection process / reconnection process with a base station, and a secondary cell added in addition to the primary cell.
- the UE continuously measures the quality of a serving cell that provides a current service and the quality of a neighboring cell.
- the terminal reports the measurement result to the network at an appropriate time, and the network provides the terminal with optimal mobility through handover.
- the terminal may report the measurement result in a manner caused by the event. That is, when a specific event occurs, the measurement result is reported. At this time, it is determined in advance which cell each event is targeted for. For example, among the events, a serving cell, a neighbor cell, a primary cell, a secondary cell, or a combination thereof may be targeted. Secondary cells are basically treated as serving cells, but they are also treated as neighboring cells in certain events.
- the terminal includes the neighbor cell in the 'cellsTriggeredList'.
- the current standard specifies that "cellsTriggeredList” is included in “measResultNeighCells” unless it is empty, and “cellsTriggeredList” is included in “measResultNeighCells”.
- the base station may add the neighbor cell as a secondary cell to the terminal using a measurement report including 'measResultNeighCells'.
- the neighbor cell should basically be treated as a serving cell.
- the current standard does not prescribe the change of 'cellsTriggeredList' when a neighbor cell is added as a secondary cell. Accordingly, the neighboring cells remain in the 'cellsTriggeredList', and as a result, are transmitted in the 'measResultNeighCells'.
- a measurement report method of a terminal in which a primary cell is configured includes adding a secondary cell; Determining if the secondary cell is applicable for an associated measurement; And determining whether the secondary cell is included in the induced cells list (cellsTriggeredList), wherein the secondary cell is not applicable to the associated measurement and the secondary cell is included in the induced cell list. If so, the secondary cell is removed from the triggered cell list.
- the method may further include including the secondary cell in the triggered cell list.
- the specific event may be an event in which a neighbor cell indicates a channel state better than a threshold.
- the triggered cell list may be transmitted through a radio resource control (RRC) message.
- RRC radio resource control
- the triggered cell list may include a physical cell identity of a cell.
- the primary cell may be a cell in which the terminal starts an initial connection establishment procedure or a connection re-establishment procedure.
- the secondary cell may be a cell used to provide additional radio resources in addition to the primary cell.
- a terminal in which a primary cell is set includes a radio frequency (RF) unit for transmitting and receiving a radio signal; And a processor coupled with the RF unit, wherein the processor adds a secondary cell, determines whether the secondary cell is applicable for an associated measurement, and whether the secondary cell is included in the triggered list of cells (cellsTriggeredList). Determine that if the secondary cell is not applicable to the associated measurement and the secondary cell is included in the triggered cell list, the secondary cell is removed from the triggered cell list. .
- RF radio frequency
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- FIGS. 2 and 3 illustrate a structure of a radio interface protocol between a UE and an E-UTRAN based on the 3GPP radio access network standard.
- 4 is a diagram for describing an operation related to radio link failure.
- 5 and 6 illustrate a case where the RRC connection re-establishment procedure succeeds and fails.
- FIG. 7 is a diagram for describing a procedure in which a UE performs measurement and reports a report to a network in a 3GPP LTE system.
- FIG. 8 shows an example of measurement settings set in a terminal.
- 11 is a diagram for summarizing and explaining the above-described measurement operation.
- FIG. 12 is a diagram for describing a carrier aggregation technique applied to a 3GPP LTE-A system.
- FIG. 13 is a diagram for describing a definition of a cell from a terminal perspective when a carrier aggregation technique is applied.
- FIG. 14 illustrates a case where a secondary cell is included in 'measResultNeighCells'.
- 15 is an operation method of a terminal supporting carrier aggregation.
- FIG. 16 describes steps S1601 to S1603 of FIG. 15.
- FIG. 17 is a diagram illustrating a configuration of an embodiment of a wireless communication system including a terminal device and a base station device according to the present invention.
- 'measurement' receives a reference signal received from cells located in inter-frequency, intra-frequency, and inter-RAT (radio access technology) according to the measurement setting received by the UE from the network. Thus, it can be defined as measuring the quality value of the cell.
- quality means the signal quality or the cell quality which is recognized through the reference signal received from the measurement target cell.
- a 3GPP LTE system As an example of a wireless communication / mobile communication system for applying the present invention, a 3GPP LTE system will be briefly described.
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- LTE Long Term Evolution
- the E-UTRAN consists of eNBs (e-NodeBs or base stations), and is connected between eNBs through an X2 interface.
- the eNB is connected to a user equipment (hereinafter referred to as UE) through an air interface and is connected to an Evolved Packet Core (EPC) through an S1 interface.
- UE user equipment
- EPC Evolved Packet Core
- the EPC includes a mobility management entity (MME), a serving-gateway (S-GW), and a packet data network-gateway (PDN-GW).
- MME mobility management entity
- S-GW serving-gateway
- PDN-GW packet data network-gateway
- 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. (Second layer) and L3 (third layer), wherein a physical layer belonging to the first layer provides an information transfer service using a physical channel, and a third layer.
- the radio resource control layer (hereinafter referred to as RRC) layer located in the 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.
- FIGS. 2 and 3 illustrate a structure of a radio interface protocol between a UE and an E-UTRAN based on the 3GPP radio access network standard.
- the wireless interface protocol consists of a physical layer, a data link layer, and a network layer horizontally, and vertically, a user plane for transmitting data information (user plane, u-plane). ) And control plane (C-plane) for transmitting signaling.
- the protocol layers of FIGS. 2 and 3 are based on the lower three layers of the Open System Interconnection (OSI) reference model, which are well known in communication systems, and include L1 (first layer), L2 (second layer), L3 (third layer) can be divided. These radio protocol layers exist in pairs in the UE and the E-UTRAN, and are responsible for data transmission in the radio section.
- OSI Open System Interconnection
- the physical layer which is the first layer, provides an information transfer service to an upper layer by using a physical channel.
- the physical layer is connected to the upper medium access control layer through a transport channel, and data between the medium access control layer and the physical layer moves through the transport channel. Then, data is moved between different physical layers, that is, between physical layers of a transmitting side and a receiving side through physical channels.
- the physical channel is modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.
- OFDM orthogonal frequency division multiplexing
- MAC Medium access control
- RLC Radio link control layer
- the functionality of the RLC layer may be implemented as a functional block inside the MAC. In this case, the RLC layer may not exist.
- the PDCP layer of the second layer is a header compression that reduces the IP packet header size, which is relatively large and contains unnecessary control information, for efficient transmission in a low bandwidth wireless section when transmitting an IP packet such as IPv4 or IPv6. Compression) function.
- the radio resource control layer (hereinafter abbreviated as RRC) layer located at the top of the third layer is defined only in the control plane, and the configuration and reset of the radio bearer (abbreviated as RB) are performed. It is responsible for the control of logical channels, transport channels and physical channels in relation to configuration and release.
- RB means a service provided by the second layer for data transmission between the terminal and the UTRAN.
- Downlink transmission channels for transmitting data from a network to a UE include 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 transmission channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.
- RAC random access channel
- SCH uplink shared channel
- logical channels mapped to transport channels include BCCH (Broadcast Channel), PCCH (Paging Control Channel), CCCH (Common Control Channel), MCCH (Multicast Control Channel), MTCH (Multicast Traffic Channel) ).
- the physical channel is composed of several subframes on the time axis and several subcarriers on the frequency axis.
- one sub-frame consists of a plurality of symbols on the time axis.
- One subframe consists of a plurality of resource blocks, and one resource block consists of a plurality of symbols and a plurality of subcarriers.
- each subframe may use specific subcarriers of specific symbols (eg, the first symbol) of the corresponding subframe for a physical downlink control channel (PDCCH), that is, an L1 / L2 control channel.
- PDCCH physical downlink control channel
- One subframe may consist of two slots having a length of 0.5 ms, which may correspond to 1 ms corresponding to a transmission time interval (TTI), which is a unit time in which data is transmitted.
- TTI transmission time interval
- System Information includes essential information that the terminal needs to know in order to access the base station. Therefore, the terminal must receive all the system information before accessing the base station, and must always have the latest system information. In addition, since the system information is information that should be known to all terminals in a cell, the base station periodically transmits the system information.
- the system information is divided into MIB, SB, SIB, and the like.
- the Master Information Block allows the UE to know the physical configuration of the cell, for example Bandwidth.
- SB Service Block
- SIB System Information Block
- SIB System Information Block
- SIB is a collection of system information related to each other. For example, some SIBs contain only information of neighboring cells, and some SIBs contain only information of uplink radio channels used by the terminal.
- the service provided by the network to the terminal can be classified into three types. Depending on what service can be provided, the UE also recognizes the cell type differently. The following describes the service type first, followed by the cell type.
- Normal service This service means a public use for general use, and can be provided in a suitable 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 Cell in which the terminal can receive limited service. This cell is not barred from the terminal's point of view and is a cell that satisfies the cell selection criteria of the terminal.
- Suitable cell A cell in which the terminal can receive a normal 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 PLMN to which the terminal can access and must be a cell which is not prohibited from performing the 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.
- Barred cell A cell in which a cell broadcasts a barred cell through system information.
- Reserved cell A cell that broadcasts information called a reserved cell through system information.
- the RRC state refers to whether or not the RRC of the UE is in a logical connection with the RRC of the E-UTRAN. If the RRC state is connected, the RRC_CONNECTED state is referred to as RRC_IDLE state. Since the UE of the RRC_CONNECTED state has an RRC connection, the E-UTRAN can grasp the existence of the UE in units of cells, 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 the core network manages the tracking area unit, which is a larger area unit than the cell. That is, the RRC_IDLE state terminal is identified only in a large area unit, and must move to the RRC_CONNECTED state in order to receive a normal mobile communication service such as voice or data.
- the terminal When the user first powers on the terminal, the terminal first searches for an appropriate cell and then stays in the RRC Idle state in the cell.
- the UE staying in the RRC_IDLE state needs to establish an RRC connection
- the UE establishes an RRC connection with the RRC of the E-UTRAN through an RRC connection procedure and transitions to the RRC_CONNECTED state.
- the UE in the idle state needs to establish an RRC connection. For example, if an uplink data transmission is necessary due to a user's call attempt, or a paging message is received from the E-UTRAN, Send a response message.
- the NAS (Non-Access Stratum) 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.
- ECM-IDLE EPS Connection Management
- ECM_CONNECTED ECM-CONNECTED
- the UE in the ECM-IDLE state performs a terminal-based mobility related procedure such as cell selection or reselection without receiving a command from the network.
- a terminal-based mobility related procedure such as cell selection or reselection without receiving a command from the network.
- the terminal when the terminal is in ECM-CONNECTED, the mobility of the terminal is managed by the command of the network.
- the terminal informs the network of the terminal through the Tracking Area Update procedure.
- the terminal continuously performs measurement to maintain the communication link quality with the cell receiving the service. In particular, the terminal determines whether the communication link quality with the cell that is currently receiving and providing the service is in a state where communication is impossible. If it is determined that the current cell quality is bad enough that communication is impossible, the terminal declares a radio link failure. When the UE declares radio link failure, the UE gives up maintaining communication with this cell, selects a cell through a cell selection procedure, and then attempts to reestablish RRC connection. As such, the operation related to the radio link failure may be described in two steps as shown in FIG. 4.
- the terminal checks whether there is a problem in the current communication link. If there is a problem, the UE declares a radio link problem and waits for the communication link to recover for a predetermined time T1. If the link recovers during this time, the terminal continues normal operation. If the radio link problem does not recover during T1 in the first step, the terminal declares a radio link failure and enters the second step. In the second step, the UE performs an RRC connection re-establishment procedure to recover from radio link failure.
- the RRC connection re-establishment procedure is a procedure to reset the RRC connection again in the RRC_CONNECTED state. Since the terminal remains in the RRC_CONNECTED state, that is, does not enter the RRC_IDLE state, the terminal does not initialize all of its radio settings (for example, radio bearer settings). Instead, the UE temporarily suspends use of all radio bearers except SRB0 when starting the RRC connection reconfiguration procedure. If the RRC connection reestablishment is successful, the terminal resumes the use of radio bearers that have temporarily suspended use.
- 5 and 6 illustrate a case where the RRC connection re-establishment procedure succeeds and fails.
- the terminal first selects a cell by performing a cell selection (Cell selection). In the selected cell, the terminal receives system information to receive basic parameters for cell access. Subsequently, the UE attempts to reset the RRC connection through a random access procedure. If the cell selected by the terminal through the cell selection is a cell having the context of the terminal, that is, a prepared cell, the corresponding cell may accept the RRC connection resetting request of the terminal, and thus the RRC connection resetting procedure may succeed. However, if the cell selected by the terminal is not a prepared cell, since the cell does not have a context of the terminal, it cannot accept the RRC connection resetting request of the terminal, and thus the RRC connection resetting procedure fails.
- Cell selection cell selection
- the terminal receives system information to receive basic parameters for cell access.
- the UE attempts to reset the RRC connection through a random access procedure. If the cell selected by the terminal through the cell selection is a cell having the context of the terminal, that is, a prepared cell, the corresponding cell
- FIG. 7 is a diagram for describing a procedure in which a UE performs measurement and reports a report to a network in a 3GPP LTE system.
- the terminal may receive measurement configuration information from the base station (S710).
- a message including such measurement setting information is called a measurement setting message.
- the terminal may perform measurement based on the measurement setting information (S720). If the measurement result satisfies the reporting condition in the measurement configuration information, the terminal may report the measurement result to the base station (S730).
- a message including a measurement result is called a measurement report message.
- the measurement configuration message received from the base station may have the following structure.
- the measurement setting information in the measurement setting message illustrated in Table 1 will be described below.
- the measurement target includes at least one of an intra-frequency measurement target for intra-cell measurement, an inter-frequency measurement target for inter-cell measurement, and an inter-RAT measurement target for inter-RAT measurement.
- the intra-frequency measurement object indicates a neighboring cell having the same frequency band as the serving cell
- the inter-frequency measurement object indicates a neighboring cell having a different frequency band from the serving cell
- the inter-RAT measurement object is
- the RAT of the serving cell may indicate a neighboring cell of another RAT.
- Reporting configuration information Information on a reporting condition and a report type relating to when a terminal reports a measurement result.
- the reporting condition may include information about an event or a period at which the reporting of the measurement result is triggered.
- the report type is information about what type of measurement result to configure.
- Measurement identity information This is information about a measurement identifier that associates a measurement object with a report configuration, and allows the terminal to determine what type and when to report to which measurement object.
- the measurement identifier information may be included in the measurement report message to indicate which measurement object the measurement result is and in which reporting condition the measurement report occurs.
- Quantitative configuration information information on a parameter for setting filtering of a measurement unit, a reporting unit, and / or a measurement result value.
- Measurement gap information Information about a measurement gap, which is a section in which a UE can only use measurement without considering data transmission with a serving cell because downlink transmission or uplink transmission is not scheduled. .
- the terminal may have a measurement target list, a measurement report configuration list, and a measurement identifier list to perform a measurement procedure.
- the base station may set only one measurement target for one frequency band to the terminal.
- E-UTRA Evolved Universal Terrestrial Radio Access
- RRC Radio Resource Control
- Protocol specification Release 8
- event A1 is an event in which a serving cell has a better channel state than a threshold
- event A2 is an event in which a serving cell has a better channel state than a threshold
- event A3 is a channel having a neighbor cell greater than or equal to an offset value than a serving cell. This is a good event.
- event A4 may indicate that the neighbor cell has a better channel state than the threshold.
- Event A5 is an event in which the serving cell has a worse channel state than the threshold 1 and the neighbor cell has a better channel state than the threshold 2.
- the terminal If the measurement result of the terminal satisfies the event (quality measurement report criteria) set as described above, the terminal transmits a measurement report message to the base station.
- FIG. 8 shows an example of measurement settings set in a terminal.
- measurement identifier 1 connects an intra-frequency measurement object and a reporting configuration 1.
- the terminal performs intra frequency measurement
- report setting 1 is used to determine a criterion and report type of the measurement result report.
- the measurement identifier 2 is connected to the intra-frequency measurement object like the measurement identifier 1, but is connected to the setting 2 by viewing the intra-frequency measurement object.
- the terminal performs intra-frequency measurement, and report configuration 2 is used to determine a criterion and report type of the measurement result report.
- the terminal may transmit the measurement result to the network even if the measurement result for the intra-frequency measurement object satisfies any one of the report configuration 1 and the report configuration 2.
- Measurement identifier 3 connects inter-frequency measurement object 1 and reporting configuration 3.
- the terminal may report the measurement result to the network if the measurement result for the intre-frequency measurement object 1 satisfies the reporting condition included in the report configuration 1.
- Measurement identifier 4 connects inter-frequency measurement object 2 and reporting configuration 2.
- the terminal may report the measurement result to the network when the measurement result for the intre-frequency measurement object 2 satisfies the reporting condition included in the report configuration 2.
- the measurement identifier connects a measurement object and a report setting, and each report setting may include an event causing a measurement report. Therefore, the measurement identifier may also be expressed as connecting the measurement object and a specific event. In this case, the measurement for evaluating whether the specific event is satisfied may be expressed as being associated with the measurement object (or, for convenience, the specific event may be simply referred to as a measurement associated with the measurement object).
- the measurement target, report setting, and / or measurement identifier may be added, changed, and / or deleted. This may be indicated by the base station sending a new measurement configuration message or a measurement configuration change message to the terminal.
- the "NW command" may be a measurement setting message or a measurement setting change message indicating to delete the measurement identifier 2. If the measurement identifier 2 is deleted, the measurement for the measurement object associated with the measurement identifier 2 is stopped, and no measurement report is transmitted. However, the measurement target or report setting associated with the deleted measurement identifier may not be changed.
- the "NW command" may be a measurement configuration message or a measurement configuration change message indicating removal of the inter-frequency measurement object 1.
- the terminal may also delete the associated measurement identifier 3. Accordingly, the measurement for the inter-frequency measurement object 1 is stopped, and the measurement report may not be transmitted. However, the report setting associated with the deleted inter-frequency measurement object 1 may not be changed or deleted.
- the terminal If the reporting configuration is removed, the terminal also removes the associated measurement identifier. The terminal stops the measurement and the measurement report for the associated measurement object by the associated measurement identifier. However, the measurement object associated with the deleted report setting may not be changed or deleted.
- 11 is a diagram for summarizing and explaining the above-described measurement operation.
- the terminal may receive measurement setting information from a base station (network) (S1101).
- the measurement setting information includes measurement object information, reporting configuration information, measurement identity information, quantity configuration information, and measurement gap as described above with reference to Table 1 above. (Measurement gap) information may be included.
- the measurement setting information may include information such as deleting / adding a specific measurement object and / or a specific measurement identifier as described above with reference to FIGS. 9 and 10.
- Table 3 shows an example of a conventional report configuration message.
- 'a3-Offset / a6-Offset' represents the offset value in measurement report triggering conditions for Event A3 / A6.
- 'AN-ThresholdM' represents the threshold used in measurement reporting triggering conditions for event aN.
- EventId' represents the selection of E-UTRA for the event triggered reporting requirement.
- 'MaxReportCells' indicates the maximum number of cells (excluding serving cells) included in the measurement report.
- 'ReportAmount' indicates the number of measurement reports that can be applied to triggerType as well as triggerType periodical.
- reportOnLeave / a6-reportOnLeave indicates whether the measurement reporting process should be started when a leaving condition is satisfied for one cell in cellsTriggeredList.
- reportQuantity indicates the amount that should be included in the measurement report.
- timeToTrigger represents the time that an event must satisfy a certain condition in order to trigger a measurement report.
- triggerQuatity represents the amount used to evaluate the condition causing the event.
- the terminal may perform quality measurement according to the received measurement setting information (S1102). Based on this, the terminal may perform a measurement result evaluation procedure for determining whether the quality measurement result value satisfies the quality reporting criteria (S1103). In this case, the evaluation criteria may be used as shown in Table 2 above. If the measurement result satisfies the reporting criteria (S1104), the terminal may configure the measurement report information including the measurement result (S1105) and transmit it to the base station (network) (S1106).
- An example of the structure of a measurement report message that can be used when applied to the 3GPP LTE system is as follows.
- Information included in the measurement report message illustrated in Table 4 may include the following information.
- Measurement identifier A measurement identifier associated with a report setting for which a reporting criterion is satisfied. Through this measurement identifier, the network can know which measurement report is transmitted by the terminal.
- Measured serving cell quality value This is a quality value of the serving cell measured by the UE. For example, it may include a reference signal received power (RSRP) and a reference signal received quality (RSRQ).
- RSRP reference signal received power
- RSSQ reference signal received quality
- Measured neighbor cell information As a measurement identifier of the neighbor cell measured by the UE, the following contents may be included.
- Neighbor Cell Identifier A physical cell identifier (eg, PCI for E-UTRAN) of a neighbor cell that generally meets reporting criteria.
- Quality Value of Neighbor Cell (measResult): In general, this is a quality value (eg, RSRP, RSRQ) of a neighbor cell that satisfies a reporting criterion.
- the measurement report message may be transmitted in the form of an upper layer signal such as an RRC message.
- the mobile station can ensure the mobility of the mobile station by efficiently measuring the quality of the serving cell and / or neighbor cells, and reporting it to the base station.
- a secondary cell is added to the terminal in addition to the measurement operation, an efficient measurement report operation is proposed.
- CA carrier aggregation
- FIG. 12 is a diagram for describing a carrier aggregation technique applied to a 3GPP LTE-A system.
- the LTE-A technical standard is an IMT-Advanced candidate technology of the International Telecommunication Union (ITU), and is designed to meet the IMT-Advanced technology requirements of the ITU. Accordingly, in LTE-A, discussions are being made to expand the bandwidth compared to the existing LTE system in order to satisfy the requirements of the ITU.
- a carrier (carrier) that can have in the existing LTE system (carrier) is defined as a Component Carrier (hereinafter referred to as a CC), it is discussed to use up to five such CC.
- CC can have a bandwidth of up to 20MHz, like the LTE system, it is a concept that can extend the bandwidth up to 100MHz.
- CA carrier aggregation
- FIG. 13 is a diagram for describing a definition of a cell from a terminal perspective when a carrier aggregation technique is applied.
- a plurality of CCs may be included for downlink (DL) and uplink (UL), respectively.
- DL downlink
- UL uplink
- a combination of a DL CC and a UL CC (cell 0 of FIG. 13), or only a DL CC (cell 1 of FIG. 13) may be regarded as a cell from the terminal's point of view.
- a connection relationship between a DL CC and an UL CC may be indicated through system information transmitted through DL resources. That is, the system information of the mobile communication system to which the CA is applied includes information on the connection relationship between the UL CC and the DL CC in addition to the system information described above, and FIG. 13 illustrates this as the SIB2 connection.
- the LTE-A system proposes a concept of distinguishing CCs on which all control signaling is transmitted from other CCs as a primary CC.
- a UL Primary CC and a DL Primary CC are configured for each UE, and thus, a combination of a UL Primary CC used for transmitting UL control information and a DL Primary CC used for transmitting DL control information may be referred to as a primary cell or a PCell.
- cells configured in the terminal may be referred to as a secondary cell or an SCell.
- the primary cell may be a cell operating at a primary frequency, and may be defined as a cell in which the UE starts an initial connection establishment procedure or a connection reestablishment procedure. Or it may be defined as a cell indicated as the primary cell in the handover process.
- the secondary cell is a cell operating at the secondary frequency, and may be defined as a cell used to provide additional radio resources in addition to the primary cell. After establishing the RRC connection, the secondary cell may be configured.
- the terminal operates as follows with respect to the measurement report caused by the event.
- the UE determines which cell is applicable to which event. For example, only serving cells are applicable to events A1 and A2, and only neighboring cells are applicable to event A4. That is, a serving cell is an applicable cell for events A1 and A2 and a neighbor cell is applicable for an event A4.
- the secondary cell is exceptionally regarded as a neighbor cell. In other cases, the secondary cell is considered a serving cell. That is, an exception rule for the secondary cell is applied to the events A3 and A5.
- the triggered cell list may be a list including cells that satisfy a particular event.
- the triggered cell list may be a list including cells satisfying each event among applicable cells for each event.
- the triggered cell list may be configured for each event or may be configured for a plurality of events.
- the triggered cell list may include the physical cell identity of the cell.
- the terminal configures 'measResultPcell' and 'measResultServFreqList'.
- the UE configures 'measResultNeighCells' only when there are applicable neighbor cells to report. Among the entries of 'cellsTriggeredList', the applicable neighbor cells that should report on the event may be included in 'measResultNeighCells'.
- the following table shows specific examples of measurement report messages reported by the UE.
- the secondary cell may operate as follows.
- the terminal regards the secondary cell as the serving cell.
- the terminal includes the secondary cell in the 'cellsTriggeredList'.
- the terminal since the secondary cell is regarded as a serving cell, the terminal does not form 'measResultNeighCells' because there are no applicable neighbor cells to report in 'cellsTriggeredList'. That is, 'measResultNeighCells' is not included in the measurement report.
- the terminal transmits a measurement report including only 'measResultPCel' and 'measResultServFreqList'.
- the terminal regards the secondary cell as a neighbor cell.
- the terminal If the secondary cell satisfies the event A3, the terminal includes this secondary cell in the 'cellsTriggeredList'.
- 'cellsTriggeredList' including the secondary cell is included in 'measResultNeighCells' of the measurement report.
- the terminal transmits a measurement report including 'measResultPCel', 'measResultServFreqList', and 'measResultNeighCells'.
- the terminal regards the secondary cell as the serving cell.
- the terminal regards the secondary cell as a neighbor cell.
- the terminal includes the secondary cell in the 'cellsTriggeredList'.
- 'cellsTriggeredList' including the secondary cell is included in 'measResultNeighCells' of the measurement report.
- the terminal transmits a measurement report including 'measResultPCel', 'measResultServFreqList', and 'measResultNeighCells'.
- the terminal regards the secondary cell as the serving cell.
- the measurement report depends on whether an event is triggered (satisfied), and whether the secondary cell is included in 'measResultNeighCells' depends on whether the secondary cell is considered a serving cell or a neighbor cell. . Therefore, ambiguity may occur when the network is implemented in such a manner as to refer to the contents of 'measResultNeighCells' for radio resource management (RRM).
- RRM radio resource management
- FIG. 14 illustrates a case where a secondary cell is included in 'measResultNeighCells'.
- cell 1 of the f1 frequency band may be configured as a primary cell in the terminal. Further, suppose that cells 2, 3, and 4 in the f3 frequency band are set as measurement target neighbor cells of event A4 by the measurement configuration message. In other words, assume that cells 2, 3, and 4 are applicable to event A4.
- the terminal When event A4 is satisfied for cell 2, the terminal includes cell 2 in a 'cellsTriggeredList'. Then, since 'cellsTriggeredList' is not empty and there is a neighboring cell, Cell 2, cells included in 'cellsTriggeredList' are included in 'measResultNeighCells' and transmitted.
- cell 2 may be added as a secondary cell for the terminal.
- 'cellsTriggeredList' is not empty, cells included in 'cellsTriggeredList' are included in 'measResultNeighCells' and transmitted.
- cell 2 is added as a secondary cell and is no longer a neighboring cell, since cell 2 is included in the 'cellsTriggeredList', the UE may transmit the cell 2 again in 'measResultNeighCells'. This causes a problem of unnecessary power waste of the terminal and ambiguity in radio resource management of the base station.
- the terminal may operate according to the above-described conventional operation when only one cell, for example, a primary cell is set, and when a secondary cell is added, may operate as in Application Example 1 or 2 below. That is, in a situation in which only a primary cell is set in a terminal supporting carrier aggregation, when a cell other than the primary cell is added as a secondary cell of the terminal, application example 1 or 2 may be applied.
- the UE may regard the secondary cell as the serving cell with respect to a specific event.
- the secondary cell may be regarded as a cell which is not applicable in the evaluation of the specific event.
- the terminal may transmit a measurement report by satisfying a specific event of cell 2 as a neighboring cell.
- the terminal may follow the conventional operation.
- the terminal regards the cell 2 as a serving cell for the specific event and regards it as not applicable in the evaluation of the event. If the applicable cell of the particular event is a neighbor cell, then cell 2 is now considered to be not applicable to the particular event.
- the terminal determines whether cell 2 added as the secondary cell is applicable to the associated measurement. In the above example, since the cell 2 added as the secondary cell is not applicable to the specific event, the terminal removes the cell 2 which is the secondary cell from the 'cellsTriggeredList'.
- the terminal may stop transmitting the subsequent measurement report regarding the associated measurement.
- the terminal transmits a measurement report message including 'measResultPCell', 'measResultServFreqList', and 'measResultNeighCells' (if available).
- the UE may regard the secondary cell as a neighbor cell in evaluating a specific event.
- the secondary cell may be considered applicable to the evaluation of the particular event.
- the terminal includes the secondary cell in the 'cellsTriggeredList'.
- the terminal excludes the secondary cell.
- the terminal transmits a measurement report including 'measResultPCell', 'measResultServFreqList', and 'measResultNeighCells' (if not empty).
- the difference from the application example 1 is that the secondary cell may be regarded as a neighbor cell in the evaluation of the specific event, but may be regarded as a serving cell in configuring a field to be included in the measurement report message. Therefore, the secondary cell may be excluded from the field configuring the measurement report message.
- 15 is an operation method of a terminal supporting carrier aggregation.
- the terminal performs a measurement report to the base station (S1500).
- this measurement report suppose that neighboring cell 2 satisfies event A4 and thus includes cell 2 in 'cellsTriggeredList', and as a result, 'measResultNeighCells' includes cell 2. That is, it is assumed that the cell 2 has passed the step of including the cell list ('cellsTriggeredList') induced by satisfying the specific event.
- the base station transmits configuration information ('sCellToAddModList') for the secondary cell to be added to the terminal with reference to the measurement report (S1501).
- the terminal adds a secondary cell (S1502).
- the terminal may add a specific cell as the secondary cell based on the configuration information on the secondary cell. For example, assume that cell 2 has been added as a secondary cell. At this time, the secondary cell, Cell 2, is regarded as the serving cell, and the secondary cell is not applicable to the associated measurement event A4.
- event A4 becomes an associated measurement for cell 2. This is because the cells applicable to the event A4 are neighbor cells as described above. However, when cell 2 is added as a secondary cell to the terminal and is considered as a serving cell, it is no longer applicable to event A4.
- the terminal performs steps S1601 to S1603 described with reference to FIG. 16.
- FIG. 16 describes steps S1601 to S1603 of FIG. 15.
- the terminal determines whether a secondary cell is applicable to an associated measurement (S1601).
- cell 2 is added as a secondary cell. If cell 2 is a neighbor cell and is associated with event A4, cell 2 is applicable to the associated measurement. On the other hand, if cell 2 is the serving cell and is associated with event A4, then cell 2 is not applicable for the associated measurement. According to Application Example 1, cell 2 added as a secondary cell is considered as a serving cell with respect to event A4 and thus is not applicable to the associated measurement.
- the terminal determines whether the secondary cell is included in the 'cellsTriggeredList' (S1602).
- the terminal removes the secondary cell from the 'cellsTriggeredList' (S1603).
- the terminal excludes secondary cells that are not applicable to the associated measurement in the measurement report. This is done by removing secondary cells from the cellsTriggeredList that are not applicable to the associated measurement.
- the cell 2 in the state where only the primary cell is set, the cell 2 is regarded as the neighboring cell in the evaluation for a specific event (eg, A4) according to the conventional terminal operation and is included in the measurement report S1500 and transmitted to the base station.
- a specific event eg, A4
- cell 2 is considered a serving cell in the evaluation for the particular event according to application example 1, or ii) in configuring a field to be included in the measurement report message according to application example 2.
- Cell 2 was considered a serving cell.
- cell 2 is removed from the field ('cellsTriggeredList') to be included in the measurement report message defined for the particular event A4.
- the UE may regard the secondary cell as a serving cell when evaluating a specific event, and may regard the secondary cell as a neighbor cell when configuring a field to be included in the measurement report.
- the secondary cell may be considered applicable in the evaluation of specific events A1 and A2. If the secondary cell triggers the specific event, the terminal includes the secondary cell in the 'cellsTriggeredList'.
- 'CellsTriggeredList' including the secondary cell is included in 'measResultNeighCells' of the measurement report.
- the terminal transmits a measurement report including 'measResultPCell', 'measResultServFreqList', and 'measResultNeighCells'.
- the terminal regards the secondary cell as the serving cell in evaluating a specific event. That is, the secondary cell may be considered applicable in the evaluation of specific events A1 and A2. If the secondary cell triggers the specific event, the terminal includes the secondary cell in the 'cellsTriggeredList'. At this time, the secondary cell is included in the 'cellsTriggeredList' not only the serving cell but also the neighboring cell.
- 'cellsTriggeredList' including the secondary cell as the neighboring cell as well as the serving cell is included in the 'measResultNeighCells' of the measurement report.
- only neighbor cells of 'cellsTriggeredList' are included in 'measResultNeighCells'.
- the terminal transmits a measurement report including 'measResultPCell', 'measResultServFreqList', and 'measResultNeighCells'.
- FIG. 17 is a diagram illustrating a configuration of an embodiment of a wireless communication system including a terminal device and a base station device according to the present invention.
- a UE device may include a receiving module 1111, a transmitting module 1112, a processor 1113, and a memory 1114, respectively.
- the receiving module 1111 may receive various signals, data, information, and the like from the base station.
- the transmission module 1112 may transmit various signals, data, information, and the like to the base station.
- the receiving module 1111 may receive measurement setting information including the above-mentioned reference information from the network.
- the processor 1113 adds the secondary cell and determines whether the secondary cell is applicable for the associated measurement. And determines whether a secondary cell is included in the triggered cell list, if the secondary cell is not applicable to the associated measurement, and if the secondary cell is included in the triggered cell list. Remove the cell from the triggered cell list.
- the base station (eNB) device may include a receiving module 1131, a transmitting module 1132, a processor 1133, and a memory 1134.
- the reception module 1131 may receive various signals, data, information, and the like from the terminal.
- the transmission module 1132 may transmit various signals, data, information, and the like to the terminal.
- the processor 1133 may transmit setting information about the secondary cell through the transmission module 1132 and receive a measurement report message from the terminal through the reception module 1131.
- the processor 1133 may manage mobility of the corresponding terminal through the measurement report message received from the terminal.
- the processor 1133 performs a function of processing information received by the terminal device, information to be transmitted to the outside, and the like.
- the memory 1134 may store the processed information and the like for a predetermined time and may include a buffer (not shown). May be replaced by a component such as).
- embodiments of the present invention can be implemented through various means.
- embodiments of the invention may be implemented by hardware, firmware, software, or a combination thereof.
- a method according to embodiments of the present invention may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), and Programmable Logic Devices (PLDs). It may be implemented by field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs Application Specific Integrated Circuits
- DSPs Digital Signal Processors
- DSPDs Digital Signal Processing Devices
- PLDs Programmable Logic Devices
- FPGAs field programmable gate arrays
- processors controllers, microcontrollers, microprocessors, and the like.
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Abstract
Description
Claims (14)
- 프라이머리 셀이 설정된 단말의 측정 보고 방법에 있어서,
세컨더리 셀을 추가하는 단계;
상기 세컨더리 셀이 연관된 측정에 대해 적용 가능한지 결정하는 단계; 및
상기 세컨더리 셀이 유발된 셀 리스트(cellsTriggeredList)에 포함되어 있는지 여부를 결정하는 단계를 포함하되,
상기 세컨더리 셀이 상기 연관된 측정에 대하여 적용 가능하지 않고, 상기 세컨더리 셀이 상기 유발된 셀 리스트에 포함된 경우,
상기 세컨더리 셀을 상기 유발된 셀 리스트에서 제거하는(remove) 것을 특징으로 하는 방법. - 제 1 항에 있어서,
상기 세컨더리 셀이 특정 이벤트를 만족하면 상기 세컨더리 셀을 상기 유발된 셀 리스트에 포함하는 단계를 더 포함하는 것을 특징으로 하는 방법. - 제 2 항에 있어서, 상기 특정 이벤트는 이웃 셀이 문턱치보다 좋은 채널 상태를 나타내는 이벤트인 것을 특징으로 하는 방법.
- 제 1 항에 있어서,
상기 유발된 셀 리스트는 RRC(radio resource control) 메시지를 통해 전송되는 것을 특징으로 하는 방법. - 제 1 항에 있어서, 상기 유발된 셀 리스트는 셀의 물리적 셀 ID(identity)를 포함하는 것을 특징으로 하는 방법.
- 제 1 항에 있어서,
상기 프라이머리 셀은 상기 단말이 최초 연결 확립 과정(initial connection establishment procedure) 또는 연결 재확립 과정(connection re-establishment procedure)을 시작하는 셀인 것을 특징으로 하는 방법. - 제 6 항에 있어서,
상기 세컨더리 셀은 상기 프라이머리 셀 이외에 추가적인 무선 자원을 제공하기 위하여 사용되는 셀인 것을 특징으로 하는 방법. - 프라이머리 셀이 설정된 단말에 있어서,
무선 신호를 송수신하는 RF(radio frequency) 부; 및
상기 RF 부와 연결된 프로세서를 포함하되,
상기 프로세서는
세컨더리 셀을 추가하고, 상기 세컨더리 셀이 연관된 측정에 대해 적용 가능한지 결정하고, 상기 세컨더리 셀이 유발된 셀 리스트(cellsTriggeredList)에 포함되어 있는지 여부를 결정하되,
상기 세컨더리 셀이 상기 연관된 측정에 대하여 적용 가능하지 않고, 상기 세컨더리 셀이 상기 유발된 셀 리스트에 포함된 경우,
상기 세컨더리 셀을 상기 유발된 셀 리스트에서 제거하는(remove) 것을 특징으로 하는 단말. - 제 8 항에 있어서,
상기 프로세서는 상기 세컨더리 셀이 특정 이벤트를 만족하면 상기 세컨더리 셀을 상기 유발된 셀 리스트에 포함하는 것을 특징으로 하는 단말. - 제 9 항에 있어서, 상기 특정 이벤트는 이웃 셀이 문턱치보다 좋은 채널 상태를 나타내는 이벤트인 것을 특징으로 하는 단말.
- 제 8 항에 있어서,
상기 유발된 셀 리스트는 RRC(radio resource control) 메시지를 통해 전송되는 것을 특징으로 하는 단말. - 제 8 항에 있어서, 상기 유발된 셀 리스트는 셀의 물리적 셀 ID(identity)를 포함하는 것을 특징으로 하는 단말.
- 제 8 항에 있어서,
상기 프라이머리 셀은 상기 단말이 최초 연결 확립 과정(initial connection establishment procedure) 또는 연결 재확립 과정(connection re-establishment procedure)을 시작하는 셀인 것을 특징으로 하는 단말. - 제 13 항에 있어서,
상기 세컨더리 셀은 상기 프라이머리 셀 이외에 추가적인 무선 자원을 제공하기 위하여 사용되는 셀인 것을 특징으로 하는 단말.
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US15/023,082 US10659984B2 (en) | 2013-09-20 | 2014-09-19 | Measurement reporting method of terminal and terminal using same |
KR1020167005806A KR102322900B1 (ko) | 2013-09-20 | 2014-09-19 | 단말의 측정 보고 방법 및 이를 이용하는 단말 |
EP14846140.3A EP3048834B1 (en) | 2013-09-20 | 2014-09-19 | Measurement reporting method of terminal and terminal |
CN201480051846.6A CN105557013B (zh) | 2013-09-20 | 2014-09-19 | 终端的测量报告方法和使用该方法的终端 |
JP2016544292A JP6374005B2 (ja) | 2013-09-20 | 2014-09-19 | 端末の測定報告方法及びこれを用いる端末 |
US16/867,185 US11405810B2 (en) | 2013-09-20 | 2020-05-05 | Measurement reporting method of terminal and terminal using same |
US17/858,438 US11711715B2 (en) | 2013-09-20 | 2022-07-06 | Measurement reporting method of terminal and terminal using same |
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Also Published As
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US20220353723A1 (en) | 2022-11-03 |
JP6374005B2 (ja) | 2018-08-15 |
US11405810B2 (en) | 2022-08-02 |
US11711715B2 (en) | 2023-07-25 |
RU2635305C2 (ru) | 2017-11-10 |
JP2016530852A (ja) | 2016-09-29 |
US20160234710A1 (en) | 2016-08-11 |
US10659984B2 (en) | 2020-05-19 |
RU2016115049A (ru) | 2017-10-25 |
EP3048834A4 (en) | 2017-04-19 |
US20200267587A1 (en) | 2020-08-20 |
KR102322900B1 (ko) | 2021-11-05 |
EP3048834B1 (en) | 2019-11-06 |
CN105557013A (zh) | 2016-05-04 |
KR20160059478A (ko) | 2016-05-26 |
CN105557013B (zh) | 2019-05-07 |
EP3048834A1 (en) | 2016-07-27 |
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