WO2012023827A2 - 무선 통신 시스템에서 측정 결과 보고 방법 및 장치 - Google Patents
무선 통신 시스템에서 측정 결과 보고 방법 및 장치 Download PDFInfo
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- WO2012023827A2 WO2012023827A2 PCT/KR2011/006121 KR2011006121W WO2012023827A2 WO 2012023827 A2 WO2012023827 A2 WO 2012023827A2 KR 2011006121 W KR2011006121 W KR 2011006121W WO 2012023827 A2 WO2012023827 A2 WO 2012023827A2
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- cell
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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
- 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
- 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
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
Definitions
- the present invention relates to wireless communication, and more particularly, to a method and apparatus for reporting a measurement result in a wireless communication system.
- 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
- 3GPP LTE-A Techniques introduced in 3GPP LTE-A include carrier aggregation, relay, and the like.
- the 3GPP LTE system is a single carrier system supporting only one bandwidth (that is, one component carrier) of ⁇ 1.4, 3, 5, 10, 15, 20 ⁇ MHz.
- LTE-A introduces multiple carriers using carrier aggregation.
- a component carrier is defined by a center frequency and a bandwidth.
- Multi-carrier system is to use a plurality of component carriers having a bandwidth less than the total bandwidth.
- the terminal continuously performs a measurement to maintain the quality of a radio link with a serving cell receiving a service.
- the cell or frequency to be measured is called a measurement target, and a reporting setting for reporting the measurement results is associated with each measurement target independently.
- the terminal performs measurement on the measurement targets, and when the report setting is satisfied, the terminal reports the measurement result to the base station.
- the base station may set the optimal cell as the serving cell to the terminal based on various information.
- this requires a lot of radio resources to report the measurement results, the measurement results of all the serving cells is not necessarily information required for the base station.
- the present invention provides a method and apparatus for reporting measurement results for a plurality of serving cells.
- a method for reporting a measurement result by a terminal in a wireless communication system comprises setting a plurality of serving cells, the plurality of serving cells comprising at least one primary cell and at least one secondary cell, receiving a measurement setup from a base station for reporting measurement results, Performing measurement on the plurality of serving cells, determining whether a measurement report is triggered based on the measurement setting, and when the measurement report is triggered, quality of at least one serving cell of the plurality of serving cells Determining whether it is less than or equal to a secondary threshold, and transmitting the measurement report to the base station, wherein the measurement report is a quality of a best neighbor cell on a serving frequency of a serving cell having a quality that is less than or equal to the secondary threshold. It includes.
- the measurement report may be triggered.
- the measurement report may further include the quality of the report cell.
- the serving cell whose quality is compared with the secondary threshold may be a secondary cell.
- an apparatus for reporting a measurement result in a wireless communication system includes a radio frequency (RF) unit for transmitting and receiving a radio signal, and a processor connected to the RF unit, wherein the processor configures a plurality of serving cells, wherein the plurality of serving cells are at least one.
- RF radio frequency
- Receiving a measurement setup from a base station comprising a primary cell and at least one secondary cell, and including a reporting condition for reporting measurement results, performing measurements on the plurality of serving cells, and based on the measurement setup Determine whether a measurement report is triggered, if the measurement report is triggered, determine whether the quality of at least one serving cell of the plurality of serving cells is below a secondary threshold, and send the measurement report to the base station Wherein the measurement report includes the quality of the best neighbor cell on the serving frequency of the serving cell having a quality below the secondary threshold.
- a terminal in which a plurality of serving cells is set transmits quality information of neighbor cells on a corresponding serving frequency only when it is useful to a base station. Therefore, the size of the message used for the measurement result can be reduced, and unnecessary information can be prevented from being provided to the base station.
- FIG. 1 shows a wireless communication system to which the present invention is applied.
- FIG. 2 is a block diagram illustrating a radio protocol structure for a user plane.
- FIG. 3 is a block diagram illustrating a radio protocol architecture for a control plane.
- FIG. 4 is an exemplary diagram illustrating a radio link failure.
- 5 is a flowchart illustrating the success of the connection reestablishment process.
- FIG. 6 is a flowchart illustrating a failure of a connection reestablishment process.
- FIG. 7 is a flowchart illustrating a conventional measurement method.
- FIG. 8 shows an example of measurement settings set in a terminal.
- FIG. 11 shows an example of a multicarrier.
- FIG. 12 shows a structure of a second layer of a base station for multiple carriers.
- FIG. 13 shows a structure of a second layer of a terminal for multicarrier.
- FIG. 14 is a conceptual diagram illustrating a method of reporting a measurement result according to an embodiment of the present invention.
- 15 is a flowchart illustrating a method of reporting a measurement result according to an embodiment of the present invention.
- 16 is a flowchart illustrating a method of reporting a measurement result according to another exemplary embodiment of the present invention.
- 17 is a block diagram illustrating a wireless device in which an embodiment of the present invention is implemented.
- E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
- LTE Long Term Evolution
- the E-UTRAN includes a base station (BS) 20 that provides a control plane and a user plane to a user equipment (UE).
- the terminal 10 may be fixed or mobile and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device (Wireless Device), and the like.
- the base station 20 refers to a fixed station communicating with the terminal 10, and may be referred to by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like.
- eNB evolved-NodeB
- BTS base transceiver system
- access point and the like.
- the base stations 20 may be connected to each other through an X2 interface.
- the base station 20 is connected to a Serving Gateway (S-GW) through an MME (Mobility Management Entity) and an S1-U through an Evolved Packet Core (EPC) 30, more specifically, an S1-MME through an S1 interface.
- S-GW Serving Gateway
- MME Mobility Management Entity
- EPC Evolved Packet Core
- EPC 30 is composed of MME, S-GW and P-GW (Packet Data Network-Gateway).
- the MME has information about the access information of the terminal or the capability of the terminal, and this information is mainly used for mobility management of the terminal.
- S-GW is a gateway having an E-UTRAN as an endpoint
- P-GW is a gateway having a PDN as an endpoint.
- Layers of the Radio Interface Protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems.
- L2 second layer
- L3 third layer
- the RRC Radio Resource Control
- the RRC layer located in the third layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges an RRC message between the terminal and the base station.
- FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane.
- 3 is a block diagram illustrating a radio protocol structure for a control plane.
- the data plane is a protocol stack for user data transmission
- the control plane is a protocol stack for control signal transmission.
- a physical layer (PHY) layer provides an information transfer service to a higher layer using a physical channel.
- the physical layer is connected to a medium access control (MAC) layer, which is an upper layer, through a transport channel. Data is moved between the MAC layer and the physical layer through the transport channel. Transport channels are classified according to how and with what characteristics data is transmitted over the air interface.
- MAC medium access control
- the physical channel may be modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.
- OFDM orthogonal frequency division multiplexing
- the functions of the MAC layer include mapping between logical channels and transport channels and multiplexing / demultiplexing into transport blocks provided as physical channels on transport channels of MAC service data units (SDUs) belonging to the logical channels.
- the MAC layer provides a service to a Radio Link Control (RLC) layer through a logical channel.
- RLC Radio Link Control
- RLC layer Functions of the RLC layer include concatenation, segmentation, and reassembly of RLC SDUs.
- QoS Quality of Service
- the RLC layer has a transparent mode (TM), an unacknowledged mode (UM), and an acknowledged mode (Acknowledged Mode).
- TM transparent mode
- UM unacknowledged mode
- Acknowledged Mode acknowledged mode
- AM Three modes of operation (AM).
- AM RLC provides error correction through an automatic repeat request (ARQ).
- PDCP Packet Data Convergence Protocol
- Functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include delivery of user data, header compression, and ciphering.
- the functionality of the Packet Data Convergence Protocol (PDCP) layer in the user plane includes the transfer of control plane data and encryption / integrity protection.
- the 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.
- 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 (or referred to as an RRC connected mode), otherwise the RRC idle ( RRC idle) (or RRC idle mode).
- 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 RRC connected state. This is called the RRC idle state. 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 in the RRC idle state cannot be recognized by the E-UTRAN, and is managed by a core netwrok (CN) 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 in order to receive a normal mobile communication service such as voice or data.
- CN core netwrok
- 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). It is divided into 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.
- Normal 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 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.
- 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.
- the terminal continuously performs a measurement to maintain the quality of a radio link with a serving cell receiving a service.
- the terminal determines whether the quality of the radio link with the serving cell is deteriorated and communication is impossible. If it is determined that the quality of the current serving cell is bad enough that communication is impossible, the terminal determines that the radio link has failed.
- the UE gives up maintaining communication with the current serving cell, selects a new cell through a cell selection (or cell reselection) procedure, and establishes an RRC connection re-connection to the new cell. attempt establishment.
- radio link failure 4 is an exemplary diagram illustrating radio link failure. The operation associated with radio link failure can be described in two phases.
- the terminal In the first phase, the terminal is in normal operation and checks whether there is a problem in the current communication link. If a problem is detected, the terminal declares a radio link problem and waits for the radio link to recover during the first waiting time T 1 . If the radio link recovers before the first waiting time elapses, the terminal performs normal operation again. If the radio link does not recover until the first wait time expires, the terminal declares a radio link failure and enters the second phase.
- the terminal In a second phase, again waiting for the radio link to recover for a second waiting time T 2 . If the radio link does not recover until the second waiting time expires, the terminal enters the RRC idle state. Alternatively, the terminal may perform an RRC reestablishment procedure.
- the RRC connection reestablishment procedure is a procedure for reestablishing an RRC connection again in an RRC connection state. Since the terminal does not enter the RRC idle state, the terminal does not initialize all of the connection settings (eg, radio bearer settings, etc.). Instead, the UE temporarily suspends the use of other radio bearers other than the SRB when initiating the RC connection reestablishment procedure. If the RRC connection reestablishment succeeds, the terminal resumes the use of radio bearers that have temporarily suspended their use.
- the connection settings eg, radio bearer settings, etc.
- 5 is a flowchart illustrating the success of the connection reestablishment process.
- the terminal selects a cell by performing cell selection.
- the terminal receives system information to receive basic parameters for cell access in the selected cell.
- the terminal sends an RRC connection reestablishment request message to the base station (S510).
- the base station accepts the RRC connection reestablishment request of the terminal and sends an RRC connection reestablishment message to the terminal (S520).
- the terminal sends an RRC connection reestablishment complete message to the base station, so that the RRC connection reestablishment procedure may succeed (S530).
- the terminal sends an RRC connection reestablishment request message to the base station (S510). If the selected cell is not a prepared cell, the base station sends an RRC connection reestablishment reject message in response to the RRC connection reestablishment request to the UE (S515).
- mobility support of a terminal is essential. Accordingly, the UE continuously measures the quality of the serving cell and the neighboring cell that provide the current service. 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 perform measurement for a specific purpose set by the network and report the measurement result to the network in order to provide information that may help the operator operate the network in addition to the purpose of mobility support. For example, the terminal receives broadcast information of a specific cell determined by the network.
- the terminal may include a cell identity (also referred to as a global cell identifier) of the specific cell, location identification information (eg, tracking area code) to which the specific cell belongs, and / or other cell information (eg, For example, whether a member of a closed subscriber group (CSG) cell is a member) may be reported to the serving cell.
- a cell identity also referred to as a global cell identifier
- location identification information eg, tracking area code
- other cell information eg, For example, whether a member of a closed subscriber group (CSG) cell is a member
- the mobile station may report location information and measurement results of poor quality cells to the network.
- the network can optimize the network based on the report of the measurement results of the terminals helping the network operation.
- the terminal In a mobile communication system with a frequency reuse factor of 1, mobility is mostly between different cells in the same frequency band. Therefore, in order to ensure the mobility of the terminal well, the terminal should be able to measure the quality and cell information of neighboring cells having the same center frequency as the center frequency of the serving cell. As such, the measurement of the cell having the same center frequency as that of the serving cell is called intra-frequency measurement. The terminal performs the intra-cell measurement and reports the measurement result to the network at an appropriate time, so that the purpose of the corresponding measurement result is achieved.
- the mobile operator may operate the network using a plurality of frequency bands.
- the terminal may measure quality and cell information of neighboring cells having a center frequency different from that of the serving cell. Should be As such, a measurement for a cell having a center frequency different from that of the serving cell is called inter-frequency measurement.
- the terminal should be able to report the measurement results to the network at an appropriate time by performing inter-cell measurements.
- the base station may be configured to measure the cell of the heterogeneous network.
- This measurement for heterogeneous networks is referred to as inter-RAT (Radio Access Technology) measurement.
- the RAT may include a UMTS Terrestrial Radio Access Network (UTRAN) and a GSM EDGE Radio Access Network (GERAN) conforming to the 3GPP standard, and may also include a CDMA 2000 system conforming to the 3GPP2 standard.
- UTRAN UMTS Terrestrial Radio Access Network
- GERAN GSM EDGE Radio Access Network
- FIG. 7 is a flowchart illustrating a conventional measurement method.
- the terminal receives measurement configuration information from the base station (S710).
- a message including measurement setting information is called a measurement setting message.
- the terminal performs the measurement based on the measurement setting information (S720). If the measurement result satisfies the reporting condition in the measurement configuration information, and reports the measurement result to the base station (S730).
- a message containing a measurement result is called a measurement report message.
- the measurement setting information may include the following information.
- 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 has 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.
- the events that cause the measurement report are defined as shown in the following table.
- the terminal If the measurement result of the terminal satisfies the set event, 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 1 801 connects an intra-frequency measurement object and report configuration 1.
- the terminal performs intra frequency measurement, and report setting 1 is used to determine a criterion and report type of the measurement result report.
- the measurement identifier 2 802 is connected to the intra-frequency measurement object like the measurement identifier 1 801, but is connected to the setting 2 by viewing the intra-frequency measurement object.
- the terminal performs intra-cell measurements, and report setting 2 is used to determine the criteria and report type of the measurement result report.
- the terminal transmits the measurement result 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 3 803 connects inter-frequency measurement object 1 and report configuration 3.
- the terminal reports the measurement result when the measurement result for the intre-frequency measurement object 1 satisfies the reporting condition included in the report configuration 1.
- Measurement identifier 4 804 connects inter-frequency measurement object 2 and report configuration 2.
- the terminal reports the measurement result when the measurement result for the intre-frequency measurement object 2 satisfies the reporting condition included in the report configuration 2.
- 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 to the terminal, or by sending a measurement configuration change message.
- FIG. 9 shows an example of deleting a measurement identifier. If measurement identifier 2 802 is deleted, measurement for the measurement object associated with measurement identifier 2 802 is stopped, and no measurement report is transmitted. The measurement object or report setting associated with the deleted measurement identifier may not be changed.
- the terminal 10 shows an example of deleting a measurement object. If the inter-frequency measurement object 1 is deleted, the terminal also deletes the associated measurement identifier 3 803. Inter-frequency measurement object 1 measurement is stopped and no measurement report is 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 measuring 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.
- the terminal After receiving the measurement configuration, the terminal performs measurement on the measurement target to which the measurement identifier is connected. The UE evaluates whether the result satisfies the reporting condition based on the report configuration included in the measurement configuration. If the reporting criteria are satisfied, the terminal transmits a measurement report message including the measurement report information to the network.
- the measurement report message contains the following information.
- Measurement Identifier The measurement identifier associated with the reporting configuration for which the reporting criteria were met.
- the base station can know by which criteria the measurement report is transmitted via this measurement identifier.
- -Quality of serving cell Quality value of serving cell measured by UE
- the measurement identifier of the neighbor cell measured by the terminal including the neighbor cell identifier and the quality value of the neighbor cell.
- the neighbor cell identifier is the physical cell identifier of the neighbor cell that satisfies the reporting criteria.
- the 3GPP LTE system supports a case where the downlink bandwidth and the uplink bandwidth are set differently, but this assumes one component carrier (CC).
- CC is defined as the center frequency (band frequency) and bandwidth. This means that 3GPP LTE is supported only when the bandwidth of the downlink and the bandwidth of the uplink are the same or different in the situation where one CC is defined for the downlink and the uplink, respectively.
- the 3GPP LTE system supports up to 20MHz and may be different in uplink bandwidth and downlink bandwidth, but only one CC is supported in the uplink and the downlink.
- Spectrum aggregation (or bandwidth aggregation, also known as carrier aggregation) supports a plurality of CCs.
- Spectral aggregation is being introduced to prevent cost increases due to the use of wideband radio frequency (RF) devices, to increase yields, and to compensate for compatibility with legacy systems.
- RF radio frequency
- each CC has a bandwidth of 20 MHz. Therefore, if five CCs are allocated as granularity in units of CC having a 20 MHz bandwidth, a bandwidth of up to 100 MHz may be supported.
- the bandwidth or number of CCs is only an example. Each CC may have a different bandwidth.
- the number of downlink CCs and the number of uplink CCs may be the same or different.
- 12 shows a structure of a second layer of a base station for multiple carriers.
- 13 shows a structure of a second layer of a terminal for multicarrier.
- the MAC layer may manage one or more CCs.
- One MAC layer includes one or more HARQ entities.
- One HARQ entity performs HARQ for one CC.
- Each HARQ entity independently processes a transport block on a transport channel. Accordingly, the plurality of HARQ entities may transmit or receive a plurality of transport blocks through the plurality of CCs.
- One CC (or a pair of downlink CC and uplink CC) may correspond to one cell.
- each downlink CC may correspond to a serving cell.
- the terminal When a terminal receives a service from a plurality of downlink CCs, the terminal may be said to receive a service from a plurality of serving cells.
- the serving cell may be classified into a primary cell and a secondary cell.
- the serving frequency is the center frequency used by the serving cell.
- the serving frequency used by the primary cell is called the primary frequency
- the serving frequency used by the secondary cell is called the secondary frequency.
- the primary cell is always active.
- the UE performs an initial connection establishment process or initiates a connection reestablishment process.
- the secondary cell is activated or deactivated by the primary cell or by certain conditions.
- the secondary cell may be established after the RRC connection is established and used to provide additional radio resources.
- the primary cell may be configured as a pair of downlink CC and uplink CC.
- the secondary cell may be configured as one downlink CC or a pair of downlink CC and uplink CC.
- the serving cell may include one or more primary cells and zero or more secondary cells.
- the proposed invention relates to how to perform a measurement report when there are a plurality of serving cells.
- the quality of the cells of each serving frequency for all serving frequencies may be included in the measurement report.
- the terminal reports the quality of the cells of all the serving frequencies has an advantage that the base station can use the measurement report received from the terminal to set the optimal secondary cell to the terminal.
- the quality of cells of all serving frequencies is not always necessary for the base station.
- the quality of the secondary cell currently set in the terminal is sufficiently good, it may be desirable to maintain the setting of the current secondary cell as it is. This means that the base station does not need to receive reports for cells on all serving frequencies.
- the terminal determines whether to include the quality of the neighboring cell on each serving frequency in the measurement result according to the quality of the serving cell.
- the serving cell may be a primary cell or a secondary cell.
- the measurement result of the neighboring cell of the corresponding serving frequency may not be included in the measurement report.
- the measurement result of the neighboring cell of the corresponding serving frequency may be included in the measurement report.
- the secondary threshold may be set by the network or a predetermined value.
- the secondary threshold may be set for one or more serving frequencies.
- FIG. 14 is a conceptual diagram illustrating a method of reporting a measurement result according to an embodiment of the present invention.
- the number of primary cells, the number of secondary cells and the number of neighboring cells are merely examples.
- the cell quality is worse in the right direction at each serving frequency.
- the quality of the primary cell S11 is the best on the primary frequency f1
- the quality of the first secondary cell S21 is the best on the first secondary frequency f2
- the second secondary frequency f3 is best.
- the secondary threshold Tsp is said to be equal to the two secondary frequencies f2 and f3.
- the terminal When the reporting condition is satisfied and the measurement report is triggered, the terminal additionally compares the quality of the serving cell on each secondary frequency with the secondary threshold value Tsp. If the quality of the serving cell on the secondary frequency is above the secondary threshold Tsp, the measurement result of the neighboring cell of the corresponding secondary frequency is not included in the measurement report. If the quality of the serving cell on the secondary frequency is less than or equal to the secondary threshold Tsp, the measurement result of the neighboring cell of the highest quality among the neighboring cells of the secondary serving frequency (called the best neighboring cell) is included in the measurement report.
- the measurement result of the primary cell corresponds to one of the events in Table 1.
- the measurement report is triggered by the primary cell.
- the quality of the serving cell S21 on the first secondary frequency f2 is greater than the auxiliary threshold Tsp.
- the quality of the serving cell S33 on the second secondary frequency f3 is smaller than the auxiliary threshold Tsp.
- the measurement report includes the quality of the primary cell, the quality of the best neighbor cell on the primary frequency, the quality of the first secondary cell S21, the quality of the second secondary cell S33, and the second secondary frequency f1. ), The quality of the best peripheral cell (S31).
- 15 is a flowchart illustrating a method of reporting a measurement result according to an embodiment of the present invention.
- the terminal receives a multi-cell configuration from the base station (S1510).
- Multi-cell configuration is used to configure a plurality of serving cells and at least one primary cell and at least one secondary cell are configured. Thereafter, the base station may send a message to the terminal to activate or deactivate the configured secondary cell.
- the terminal receives a measurement configuration from the base station (S1520).
- Measurement settings include measurement objects and reporting settings.
- the measurement setting may include a secondary threshold Tsp.
- the secondary threshold may be specific to each serving cell or may be common to all serving cells. Here, it is assumed that a secondary threshold is shared for all secondary cells.
- the measurement setup may include an indicator in the measurement report that indicates whether to report the best neighbor cell at each serving frequency.
- the terminal may determine whether to report the best neighbor cell at the corresponding serving frequency when the auxiliary threshold is given for the serving cell.
- the terminal performs the measurement (S1530).
- the terminal measures the quality of the primary cell and the secondary cell.
- the terminal determines whether the measurement report is triggered (S1540).
- the terminal determines whether there is a cell (which is called a reporting cell) in which the reporting condition is satisfied based on the measurement result.
- the reporting cell may include at least one of the serving cells and / or at least one of the neighbor cells. If a report cell is found, the measurement report is triggered.
- the terminal compares the quality of each secondary cell with the secondary threshold value (Tsp) (S1550).
- the measurement result of the best neighboring cell on the secondary frequency of the corresponding secondary cell is included in the measurement report (S1560).
- the measurement result of the best neighboring cell may include a quality of the best neighboring cell and an identifier of the best neighboring cell.
- the measurement result of the best neighbor cell on the secondary frequency of the corresponding secondary cell is not included in the measurement report.
- the terminal transmits a measurement report including the measurement result of the report cell and the added measurement result of the best neighbor cell to the base station (S1570).
- 16 is a flowchart illustrating a method of reporting a measurement result according to another exemplary embodiment of the present invention.
- the terminal receives a multi-cell configuration from the base station (S1610).
- the terminal receives the measurement configuration from the base station (S1620).
- the measurement setting may include a secondary threshold Tsp.
- the terminal performs the measurement (S1630).
- the terminal measures the quality of the primary cell and the secondary cell.
- the terminal determines whether the measurement report is triggered (S1640). The terminal determines whether there is a report cell based on the measurement result. Once the report cell is found, the measurement report is triggered.
- the terminal compares the quality of the primary cell with the secondary threshold value Tsp (S1650).
- the measurement result of the best neighboring cell on each serving frequency is included in the measurement report (S1660).
- the measurement result of the best neighboring cell may include a quality of the best neighboring cell and an identifier of the best neighboring cell.
- the terminal transmits a measurement report including the measurement result of the serving cell satisfying the reporting condition and the measurement result of the added best neighbor cell to the base station (S1670).
- 17 is a block diagram illustrating a wireless device in which an embodiment of the present invention is implemented.
- the terminal 50 includes a processor 51, a memory 52, and an RF unit 53.
- the memory 52 is connected to the processor 51 and stores various information for driving the processor 51.
- the RF unit 53 is connected to the processor 51 and transmits and / or receives a radio signal.
- the processor 51 implements the proposed functions, processes and / or methods. In the embodiments of FIGS. 14 to 16, the operation of the terminal may be implemented by the processor 51.
- 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
이벤트 | 보고 조건 |
Event A1 | Serving becomes better than threshold |
Event A2 | Serving becomes worse than threshold |
Event A3 | Neighbour becomes offset better than serving |
Event A4 | Neighbour becomes better than threshold |
Event A5 | Serving becomes worse than threshold1 and neighbour becomes better than threshold2 |
Event B1 | Inter RAT neighbour becomes better than threshold |
Event B2 | Serving becomes worse than threshold1 and inter RAT neighbour becomes better than threshold2 |
Claims (14)
- 무선 통신 시스템에서 단말이 측정 결과를 보고하는 방법에 있어서,복수의 서빙 셀들을 설정하되, 상기 복수의 서빙 셀들은 적어도 하나의 1차 셀과 적어도 하나의 2차 셀을 포함하는 단계;측정 결과를 보고하기 위한 측정 설정을 기지국으로부터 수신하는 단계;상기 복수의 서빙 셀들에 대해 측정을 수행하는 단계;상기 측정 설정을 기반으로 측정 보고가 트리거되는지 여부를 결정하는 단계;상기 측정 보고가 트리거되면, 상기 복수의 서빙 셀들 중 적어도 하나의 서빙 셀의 품질이 보조 임계값 이하인지 여부를 결정하는 단계; 및상기 측정 보고를 상기 기지국으로 전송하는 단계를 포함하되,상기 측정 보고는 상기 보조 임계값 이하인 품질을 갖는 서빙 셀의 서빙 주파수 상에서 베스트 주변 셀의 품질을 포함하는 것을 특징으로 하는 방법.
- 제 1 항에 있어서,상기 보고 조건을 만족하는 보고 셀이 존재하면, 상기 측정 보고가 트리거되는 것을 특징으로 하는 방법.
- 제 2 항에 있어서,상기 측정 보고는 상기 보고 셀의 품질을 더 포함하는 것을 특징으로 하는 방법.
- 제 3 항에 있어서,품질이 상기 보조 임계값과 비교되는 서빙 셀은 2차 셀인 것을 특징으로 하는 방법.
- 제 4 항에 있어서,상기 보조 임계값은 각 2차 셀마다 독립적으로 주어지는 것을 특징으로 하는 방법.
- 제 4 항에 있어서,상기 보조 임계값은 모든 2차 셀에 대해 공용으로 주어지는 것을 특징으로 하는 방법.
- 제 4 항에 있어서, 상기 측정 설정은 상기 보조 임계값과의 비교 여부를 지시하는 지시자를 포함하는 것을 특징으로 하는 방법.
- 무선 통신 시스템에서 측정 결과를 보고하는 장치에 있어서,무선 신호를 송신 및 수신하는 RF(radio frequency)부; 및상기 RF 부와 연결되는 프로세서를 포함하되, 상기 프로세서는복수의 서빙 셀들을 설정하되, 상기 복수의 서빙 셀들은 적어도 하나의 1차 셀과 적어도 하나의 2차 셀을 포함하고;측정 결과를 보고하기 위한 측정 설정을 기지국으로부터 수신하고;상기 복수의 서빙 셀들에 대해 측정을 수행하고;상기 측정 설정을 기반으로 측정 보고가 트리거되는지 여부를 결정하고;상기 측정 보고가 트리거되면, 상기 복수의 서빙 셀들 중 적어도 하나의 서빙 셀의 품질이 보조 임계값 이하인지 여부를 결정하고; 및상기 측정 보고를 상기 기지국으로 전송하되,상기 측정 보고는 상기 보조 임계값 이하인 품질을 갖는 서빙 셀의 서빙 주파수 상에서 베스트 주변 셀의 품질을 포함하는 것을 특징으로 하는 장치.
- 제 8 항에 있어서,상기 보고 조건을 만족하는 보고 셀이 존재하면, 상기 측정 보고가 트리거되는 것을 특징으로 하는 장치.
- 제 9 항에 있어서,상기 측정 보고는 상기 보고 셀의 품질을 더 포함하는 것을 특징으로 하는 장치.
- 제 10 항에 있어서,품질이 상기 보조 임계값과 비교되는 서빙 셀은 2차 셀인 것을 특징으로 하는 장치.
- 제 11 항에 있어서,상기 보조 임계값은 각 2차 셀마다 독립적으로 주어지는 것을 특징으로 하는 장치.
- 제 11 항에 있어서,상기 보조 임계값은 모든 2차 셀에 대해 공용으로 주어지는 것을 특징으로 하는 장치.
- 제 11 항에 있어서, 상기 측정 설정은 상기 보조 임계값과의 비교 여부를 지시하는 지시자를 포함하는 것을 특징으로 하는 장치.
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KR20130041936A (ko) | 2013-04-25 |
US20130148534A1 (en) | 2013-06-13 |
US9161240B2 (en) | 2015-10-13 |
WO2012023827A3 (ko) | 2012-05-18 |
KR101529795B1 (ko) | 2015-06-17 |
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