KR102084004B1 - Methods for controlling measurement process in RRC IDLE mode and Apparatuses thereof - Google Patents

Abstract

The present disclosure relates to a method and apparatus for efficiently controlling carrier aggregation of a terminal in a network using LTE or next generation wireless access technology. More particularly, the present invention relates to a technique for allowing a terminal to perform a cell measurement operation in an RRC IDLE mode and report a result thereof. In this embodiment, the terminal receives IDLE mode measurement configuration information from the base station for measuring the channel state in the RRC IDLE mode, storing or applying IDLE mode measurement configuration information, and IDLE mode measurement configuration in the RRC IDLE mode. It provides a method and apparatus comprising the step of transmitting the IDLE mode measurement result information measured based on the information to the base station.

Description

Method and controlling measurement process in RRC IDLE mode and Apparatuses

The present disclosure relates to a method and apparatus for efficiently controlling carrier aggregation of a terminal in a network using LTE or next generation wireless access technology. More particularly, the present invention relates to a technique for allowing a terminal to perform a cell measurement operation in an RRC IDLE mode and report a result thereof.

The next generation mobile communication technology is being researched according to the demand for large data processing and high speed data processing. For example, in the current mobile communication systems such as Long Term Evolution (LTE), LTE-Advanced, 5G, etc. of the 3GPP series, a high-speed, high-capacity communication system capable of transmitting and receiving various data such as video and wireless data beyond voice-oriented services This is required.

In order to process such a request, a carrier merging technique for transmitting and receiving data by merging a plurality of carriers has been developed.

However, in order to transmit and receive data through carrier aggregation, the UE needs to measure a quality of a target carrier, a base station report, a carrier selection of the base station, and a carrier merging decision operation.

In particular, such a complicated carrier merging procedure has provided a problem of delaying a service providing time through carrier merging in a situation where a demand for processing speed of a user's communication service is increased.

Accordingly, there is a demand for development of a technology capable of providing a communication service by completing a carrier merge faster.

In the above-described background, the present disclosure provides a method for a UE to perform a measurement operation for carrier aggregation even in an RRC IDLE mode not in an RRC connected state, and to change the procedure for reporting the same to a base station so that a procedure for faster carrier merging proceeds. An apparatus is provided.

According to an embodiment of the present invention, there is provided a method of performing a measurement operation in an RRC IDLE mode by a terminal, wherein the terminal receives IDLE mode measurement configuration information for measuring a channel state in an RRC IDLE mode from a base station. And storing or applying the IDLE mode measurement configuration information and transmitting IDLE mode measurement result information to the base station based on the IDLE mode measurement configuration information in the RRC IDLE mode.

In addition, an embodiment of the method for the base station to control the RRC IDLE mode measurement operation of the terminal, generating the IDLE mode measurement configuration information for measuring the channel state in the RRC IDLE mode of the terminal and IDLE mode measurement configuration information The method includes transmitting to the terminal by including the system information block 5 or the RRC connection release message and receiving the measured IDLE mode measurement result information based on the IDLE mode measurement configuration information in the RRC IDLE mode.

In addition, according to an embodiment of the present invention, in a terminal performing a measurement operation in an RRC IDLE mode, a terminal stores IDLE mode measurement configuration information and IDLE mode measurement configuration information for measuring channel state in an RRC IDLE mode from a base station. Or it provides a terminal device including a control unit to be applied and a transmission unit for transmitting the IDLE mode measurement result information measured based on the IDLE mode measurement configuration information in the RRC IDLE mode to the base station.

In addition, an embodiment is a base station for controlling the RRC IDLE mode measurement operation of the terminal, the control unit for generating IDLE mode measurement configuration information for measuring the channel state in the RRC IDLE mode of the terminal and IDLE mode measurement configuration information system information It provides a base station apparatus including a transmitting unit for transmitting to the terminal included in the block 5 or the RRC connection release message and a receiving unit for receiving the IDLE mode measurement result information measured based on the IDLE mode measurement configuration information in the RRC IDLE mode.

The present disclosure provides a detailed procedure of the carrier (cell) measurement operation in the RRC IDLE mode of the terminal, and quickly transmits the result report to the base station when switching to the RRC connected state to reduce the overall time required for the carrier merge To provide the effect.

1 is a diagram illustrating an operation of a terminal according to an exemplary embodiment.
2 is a diagram illustrating a specific operation of a terminal for transmitting IDLE mode measurement result information according to an exemplary embodiment.
3 is a signal diagram illustrating an operation of a terminal according to an end of a timer according to an exemplary embodiment.
4 is a signal diagram illustrating a measurement and report operation in the RRC IDLE mode of the terminal according to an embodiment.
5 is a diagram for describing an operation of a base station according to an exemplary embodiment.
6 is a diagram for describing a detailed operation of a base station for receiving IDLE mode measurement result information according to an exemplary embodiment.
7 is a diagram illustrating a terminal device according to an exemplary embodiment.
8 is a diagram illustrating a base station apparatus according to an embodiment.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used to refer to the same components as much as possible, even if displayed on different drawings. In addition, in describing the present invention, if it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In the present specification, the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. In the present specification, the MTC terminal may mean a terminal supporting low cost (or low complexity) and coverage enhancement. Alternatively, in the present specification, the MTC terminal may mean a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.

In other words, in the present specification, the MTC terminal may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC related operations. Alternatively, in the present specification, the MTC terminal supports an enhanced coverage compared to the existing LTE coverage, or UE category / type defined in the existing 3GPP Release-12 or lower, or newly defined Release-13 low cost (or supporting low power consumption). low complexity) can mean UE category / type.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB). In the present specification, a user terminal is a generic concept meaning a terminal in wireless communication. In addition to user equipment (UE) in WCDMA, LTE, and HSPA, as well as mobile station (MS) in GSM, user terminal (UT), and SS It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like.

A base station or cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an Sector, a Site, and a BTS. Other terms such as a base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell may be called.

That is, in the present specification, a base station or a cell is interpreted in a comprehensive sense to indicate some areas or functions covered by a base station controller (BSC) in CDMA, a NodeB in WCDMA, an eNB or a sector (site) in LTE, and the like. It is meant to cover various coverage areas such as mega cell, macro cell, micro cell, pico cell, femto cell and relay node, RRH, RU, small cell communication range.

Since the various cells listed above have a base station for controlling each cell, the base station may be interpreted in two senses. i) the device providing the megacell, the macrocell, the microcell, the picocell, the femtocell, the small cell in relation to the wireless area, or ii) the wireless area itself. In i) all devices which provide a given radio area are controlled by the same entity or interact with each other to cooperatively configure the radio area to the base station. The eNB, RRH, antenna, RU, LPN, point, transmission / reception point, transmission point, reception point, etc., according to the configuration of the radio area, become an embodiment of the base station. In ii), the base station may indicate the radio area itself that receives or transmits a signal from a viewpoint of a user terminal or a neighboring base station.

Therefore, megacells, macrocells, microcells, picocells, femtocells, small cells, RRHs, antennas, RUs, low power nodes (LPNs), points, eNBs, transmit / receive points, transmit points, and receive points are collectively referred to as base stations. do.

In the present specification, the user terminal and the base station are used in a comprehensive sense as two transmitting and receiving entities used to implement the technology or technical idea described herein, and are not limited by the terms or words specifically referred to. The user terminal and the base station are two types of uplink or downlink transmitting / receiving subjects used to implement the technology or the technical idea described in the present invention, and are used in a comprehensive sense and are not limited by the terms or words specifically referred to. Here, the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal, the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.

There is no limitation on the multiple access scheme applied to the wireless communication system. Various multiple access techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), OFDM-FDMA, OFDM-TDMA, and OFDM-CDMA can be used. . One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB. The present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.

The uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.

In addition, in a system such as LTE and LTE-advanced, a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers. The uplink and the downlink include a Physical Downlink Control CHannel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control CHannel (EPDCCH), and the like. Control information is transmitted through the same control channel, and data is composed of a data channel such as a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).

On the other hand, control information may also be transmitted using an enhanced PDCCH (EPDCCH or extended PDCCH).

In the present specification, a cell means a component carrier having a coverage of a signal transmitted from a transmission or reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.

A wireless communication system to which embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-antenna transmission system in which two or more transmission / reception points cooperate to transmit a signal. May be a cooperative multi-cell communication system. The CoMP system may include at least two multiple transmission / reception points and terminals.

The multiple transmit / receive point is at least one having a high transmission power or a low transmission power in a macro cell region, which is connected to an eNB or a macro cell (hereinafter referred to as 'eNB') and wired controlled by an optical cable or an optical fiber to an eNB. May be RRH.

Hereinafter, downlink refers to a communication or communication path from a multiple transmission / reception point to a terminal, and uplink refers to a communication or communication path from a terminal to multiple transmission / reception points. In downlink, a transmitter may be part of multiple transmission / reception points, and a receiver may be part of a terminal. In uplink, a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH may be described in the form of 'sending and receiving a PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH'.

In addition, hereinafter, a description of transmitting or receiving a PDCCH or transmitting or receiving a signal through the PDCCH may be used as a meaning including transmitting or receiving an EPDCCH or transmitting or receiving a signal through the EPDCCH.

That is, the physical downlink control channel described below may mean PDCCH or EPDCCH, and may also be used to include both PDCCH and EPDCCH.

In addition, for convenience of description, the EPDCCH which is an embodiment of the present invention may be applied to the portion described as the PDCCH, and the EPDCCH may be applied to the portion described as the EPDCCH as an embodiment of the present invention.

Meanwhile, high layer signaling described below includes RRC signaling for transmitting RRC information including an RRC parameter.

The eNB performs downlink transmission to the terminals. The eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required for receiving the PDSCH. For example, a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted. Hereinafter, the transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel.

As a typical usage scenario in New Radio (NR), which is recently discussed in 3GPP, enhanced Mobile BroadBand (eMBB), Massive Machine Type Communication (MMTC), and Ultra Reliable and Low Latency Communication (URLLC) are being raised.

In this specification, frequencies, frames, subframes, resources, resource blocks, regions, bands, subbands, control channels, data channels, synchronization signals, various reference signals, various signals, and various messages related to NR (New Radio). May be interpreted as meaning used in the past or present, or various meanings used in the future.

For example, in the present specification, LTE and NR mean different radio access technologies, and a new radio access technology under discussion in Release-15 of 3GPP will be described using NR. NR may include various differences from LTE to other frame structures, channels, and core network technologies, and may add various functions for high-bandwidth wireless transmission, high speed, and large data transmission.

Hereinafter, for convenience of understanding, a conventional radio access technology will be described in LTE, and a new radio access technology discussed in 3GPP will be described in NR. In addition, the base station may be an eNB using the LTE technology, may be a gNB using the NR technology, and will be described separately as necessary.

In addition, a cell in the present specification is used as a term encompassing a radio path, a radio link, a carrier, and the like for transmitting data, and one base station can transmit and receive data through a plurality of cells. Alternatively, the terminal may transmit and receive data using a plurality of cells through a cell controlled by two base stations. As described below, when one base station controls a plurality of cells, it may be described as carrier aggregation, and when using a plurality of cells controlled by two or more base stations, it may be described as dual connectivity.

Carrier aggregation (CA) technology is a technique for boosting the data rate for the terminal through the additional cell. In the conventional CA technology, an RRC connection is configured for a terminal, a cell serving as a reference for handover is set as a primary cell (PCell), and an additional radio resource is allocated to the terminal to transmit / receive data to a secondary cell (SCell). Can be set. However, in the conventional CA technology, there is a time delay in configuring the secondary cell in the terminal and controlling the activation of the configured secondary cell.

Specifically, the base station provides measurement configuration information for the frequency of the candidate cell likely to be configured as a secondary cell to the terminal before configuring the CA for the RRC connected state (RRC connected mode) terminal. The terminal transmits the result of performing the measurement operation on the frequency of the candidate cell using the reporting configuration according to the measurement configuration information to the base station. The base station additionally configures a secondary cell in the terminal based on the received measurement report. Subsequently, the base station determines whether the secondary cell is activated in consideration of another measurement reporting, the amount of data transmitted / received for the secondary cell, and instructs the secondary cell to be activated to transmit user data.

Accordingly, in order to configure and utilize the CA, the RRC idle mode terminal has a significant time delay before transitioning to the RRC connected state to configure carrier aggregation and transmitting and receiving actual user data through the configured carrier aggregation.

As a way to solve this problem, research is being conducted on the blind SCell configuration in which the base station configures the SCell without measuring configuration or measurement reporting. However, this is only applicable to cells having substantially the same coverage or location. There is this.

Accordingly, in the present disclosure, to prevent the time delay problem described above, a specific procedure technique for applying a measurement configuration by a terminal in an RRC IDLE state for controlling the terminal and the base station to quickly configure a CA, and reporting the measurement result to the base station is proposed. do. That is, the present invention is to propose a technique for reducing the delay of the SCell setup to perform a fast SCell configuration after the terminal transitions from the RRC idle mode (state) to the RRC connected state.

Hereinafter, the present invention will be described based on a procedure applicable to LTE technology. However, this is for convenience of understanding and may be applied to all wireless communication technologies to which various carrier aggregation technologies including next generation radio access technologies (New RAT, NR), including LTE technology, are applied. Therefore, there is no limitation in a radio access technology to which a procedure for performing a cell measurement operation and reporting the same when the terminal is in an RRC IDLE state can be applied.

In the present specification, the information included in each message and signal is described in detail, but the message and signal may include more various information as well as the information described below. For example, each message or signal may include the information elements specified in 3GPP TS 36.331. Therefore, information elements unnecessary for describing the present embodiment, or information elements described in 3GPP TS 36.331, etc., may be omitted for clarity.

In the present specification, after the UE in the RRC idle state transitions to the RRC connected state, a technique for configuring carrier aggregation by quickly setting up the SCell includes IDLE mode measurement, low delay SCell measurement, low delay measurement, low delay SCell setup, low delay reporting, and the like. As described below, various terms such as SCell setup reduction function, idle SCell / neighbor cell measurement function, connection setup reporting function, and early setup / reporting function may be applied. Therefore, there is no limitation on the name of a technology for measuring the cell or carrier channel state in the RRC IDLE state by the terminal of the present embodiment and transmitting a result thereof.

In addition, as described above, cell measurement, carrier measurement, frequency measurement, and channel measurement below are used in the same meaning, and mean an operation of measuring a channel state of a cell or a carrier to be added to the SCell. Channel state measurement may be applied to various channel measurement algorithms. For example, measurement algorithms using RSRP and RSRQ may be applied. In addition, various published algorithms may be applied. Therefore, there is no restriction on the specific measurement algorithm in this embodiment.

1 is a diagram illustrating an operation of a terminal according to an exemplary embodiment.

Referring to FIG. 1, in order to perform a measurement operation in an RRC IDLE mode, a UE may perform an operation of receiving, by a UE, IDLE mode measurement configuration information for measuring a channel state in an RRC IDLE mode from a base station (S110). . For example, the terminal may receive measurement configuration information necessary for performing the measurement operation on the cell or carrier described above from the base station in the RRC IDLE state. The IDLE mode measurement configuration information may be received in an RRC connected state of the UE or may be received in an RRC release operation process.

For example, the IDLE mode measurement configuration information may include at least one of measurement target carrier frequency information, measurement duration information, target cell list information, and measurement reference value information for the UE to perform a measurement operation in the RRC IDLE mode. .

As another example, the IDLE mode measurement configuration information may include valid region information including a cell list for indicating whether to maintain the RRC IDLE mode measurement operation of the terminal according to the cell reselection operation of the terminal.

The terminal may receive IDLE mode measurement configuration information through a system information block 5 or an RRC connection release message.

For example, the terminal may receive the above-described IDLE mode measurement configuration information through the system information block 5 signal. As another example, the terminal may receive the IDLE mode measurement configuration information through the RRC connection release message received during the state transition process from the RRC connection mode to the RRC IDLE mode. As another example, the terminal may receive information included in the IDLE mode measurement configuration information through different signals. In detail, the terminal receives at least one of measurement target carrier frequency information, target cell list information, measurement reference value information, and effective area information through a system information block 5 signal, and measures measurement duration information through an RRC connection release message. Can be received. That is, the terminal may separately receive IDLE mode measurement configuration information through a plurality of signals.

Meanwhile, the measurement duration information may include valid time information for limiting the RRC IDLE mode measurement operation of the terminal, and the target cell list information may include one or more physical cell identification information. The valid time information is applied to a timer and configured in the terminal, and the terminal may determine whether to execute the RRC IDLE mode measurement operation and store / apply the IDLE mode measurement configuration information according to the operation or expiration of the timer.

The terminal may store or apply IDLE mode measurement configuration information (S120). For example, the terminal may store or apply the IDLE mode measurement configuration information received through the system information block 5 or the RRC connection release message to perform the RRC IDLE mode measurement operation.

The RRC IDLE mode measurement operation may be performed after the UE completes state transition from the RRC connected state to the RRC IDLE state. For example, the terminal may perform an RRC IDLE mode measurement operation on the carrier frequency to be measured when a timer having an effective time is operated according to the measurement duration information included in the IDLE mode measurement configuration information.

Alternatively, the terminal may release the received IDLE mode measurement configuration information when the timer for which the valid time is set expires. For example, the terminal may delete or deactivate IDLE mode measurement configuration information to which the corresponding timer is applied.

In addition, the terminal may store the measurement result value for each cell or carrier acquired according to the RRC IDLE mode measurement operation in the terminal. The stored measurement result value may be included in IDLE mode measurement result information.

The terminal may perform the step of transmitting the IDLE mode measurement result information measured based on the IDLE mode measurement configuration information in the RRC IDLE mode to the base station (S130). According to the RRC IDLE mode measurement operation, the UE measures the channel state (or channel quality) for the cell or carrier to be measured, and the state transition is made to the RRC connected state by including information on the measured result in the IDLE mode measurement result information. It can transmit to the ground base station.

For example, when the state transition is completed to the RRC connected state in the RRC IDLE mode, the terminal may transmit the IDLE measurement result information to the base station by including the RRC connection setup complete message or the RRC connection resume complete message.

Through this operation, the UE performs the measurement operation in the RRC IDLE state by using the IDLE measurement configuration information received in the RRC connected state, and when the state transition is made to the RRC connected state can immediately inform the base station of the measurement result. The base station can check the measurement result and proceed with the carrier merging operation at the same time the terminal transitions to the RRC connected state can eliminate the delay in the carrier merging configuration process of the terminal.

Hereinafter, a detailed procedure of storing the measurement result by the terminal and reporting the measurement result to the base station will be described in more detail with reference to the accompanying drawings.

2 is a diagram illustrating a specific operation of a terminal for transmitting IDLE mode measurement result information according to an exemplary embodiment.

Referring to FIG. 2, the terminal compares the measurement result value for each cell measured in the RRC IDLE mode with the measurement reference value information included in the IDLE mode measurement configuration information, and measures the measurement result value for the cell exceeding the measurement reference value for the IDLE mode measurement. The storing of the result information may be performed (S210). For example, the terminal may measure the channel state for the carrier or cell to be measured based on the IDLE mode measurement configuration information. In addition, the terminal may compare the measurement reference value included in the IDLE mode measurement result information with the measurement result value of each measured cell or carrier and store the measurement result value for the cell or carrier exceeding the measurement reference value. The stored measurement result values may be stored in the IDLE mode measurement result information by cell or carrier.

Meanwhile, the terminal cannot transmit IDLE mode measurement result information to the base station in the RRC IDLE mode, and thus a procedure for transmitting the IDLE mode is required.

The terminal may perform the step of receiving the system information block 2 including the indication information indicating that the base station can process the IDLE mode measurement result information (S220). For example, the base station may broadcast the system information block 2 including indication information indicating that the base station can receive and process IDLE mode measurement result information.

When the UE receives the system information block 2 (SIB 2) including the above-mentioned indication information from the base station, the UE checks the indication information and recognizes that the base station can receive IDLE mode measurement result information.

The terminal may perform the step of transmitting the presence indication information indicating the existence of the IDLE mode measurement result information to the base station in the RRC connection setup process of the terminal (S230). For example, the UE may perform a state transition operation from the RRC IDLE mode to the RRC connected mode for any reason (for example, a connection state transition event trigger). To this end, the terminal performs an RRC connection setup procedure with the base station.

In the RRC connection setup procedure, the terminal transmits existence indication information indicating that the IDLE mode measurement result information is stored in the terminal. For example, the terminal may transmit the existence indication information in the RRC connection setup complete message. For another example, the terminal may transmit the presence indication information in the RRC connection resumption completion message. As such, the terminal proceeds to the state transition in the RRC connection mode, and transmits to the base station including the presence indication information in the message indicating that the state transition is completed. Through this, the base station recognizes that the terminal stores the IDLE mode measurement result information measured in the RRC IDLE mode.

The terminal may perform a step of receiving a terminal information request message from the base station (S240). The terminal may transmit the IDLE mode measurement result information to the base station according to the terminal information request procedure. For example, when the base station receives the existence indication information and confirms that the IDLE mode measurement result information is included in the corresponding terminal, the base station transmits a terminal information request message to the terminal in order to receive the IDLE mode measurement result information.

When the terminal information request message is received, the terminal may perform the step of transmitting the IDLE mode measurement result information to the base station by including the terminal information response message (S250). For example, when a terminal request message for requesting IDLE mode measurement result information is received from the base station, the terminal transmits the IDLE mode measurement result information stored in step S210 to the base station by including the terminal information response message.

Through this process, the terminal may transmit IDLE mode measurement result information to the base station after completing the state transition to the RRC connection state. Therefore, after the UE performs the state transition in the conventional RRC connected state, the measurement configuration receiving, cell measurement, and reporting report reporting process for CA is changed to a process of reporting the measurement result immediately after the UE transitions to the RRC connected state. This can reduce delay time.

Hereinafter, the above-described operation of the terminal will be described once again with reference to the drawings according to the flow of signals from the viewpoint of the terminal and the base station.

3 is a signal diagram illustrating an operation of a terminal according to an end of a timer according to an exemplary embodiment.

Referring to FIG. 3, the base station 302 may transmit IDLE mode measurement configuration information to the terminal 301 (S310). For example, the IDLE mode measurement configuration information includes at least one of measurement target carrier frequency information, target cell list information, valid region information, and measurement reference value information for the terminal 301 to perform a measurement operation in the RRC IDLE mode. can do. The base station 302 also includes IDLE mode measurement configuration information in the system information block 5 and transmits it to the terminal 301.

The terminal 301 may store the received IDLE mode measurement configuration information (S320). The base station 302 transmits the measurement duration information to the terminal 301 through a message separate from the message of step S310 (S330). For example, when the terminal 301 transitions from the RRC connected state to the RRC IDLE state, the base station 302 transmits the measurement duration information including the valid time information in the RRC connection release message to the terminal 301. Can be. If necessary, step S320 may be performed simultaneously with step S330 or may be performed afterwards.

The terminal 301 may receive valid time information and operate a timer (eg, T331) for limiting the IDLE mode measurement operation using the valid time information (S340). The terminal 301 performs a measurement operation on a cell or a carrier in the RRC IDLE mode using the IDLE mode measurement configuration information while the timer is in operation (S350).

If the timer expires according to the elapsed time before the terminal 301 proceeds to the state transition to the RRC connected mode (S360), the terminal 301 releases the IDLE mode measurement configuration information that has been received and stored (S370). . To this end, the terminal 301 also stops the measurement operation in the IDLE mode when the timer expires. The measurement result value measured during the operation S350 may be deleted together in operation S370 or may be stored in the terminal 301.

Through such a limiting operation, power waste of the terminal 301 that may occur as the terminal 301 continuously performs a cell measurement operation in the RRC IDLE mode may be prevented.

4 is a signal diagram illustrating a measurement and report operation in the RRC IDLE mode of the terminal according to an embodiment.

Referring to FIG. 4, operations S310 to S350 are the same as those described in FIG. 3, and description thereof will be omitted.

For the result value measured according to the operation of step S350, the terminal 301 stores the measurement result value for each cell or carrier for exceeding the measurement reference value as IDLE mode measurement result information (S410). Thereafter, the terminal 301 transmits IDLE mode measurement result information to the base station 302 while performing a state transition in an RRC connected state.

For example, the base station 302 receives the IDLE mode measurement result information and broadcasts the system information block 2 including the indication information indicating that processing is possible (S420). The terminal 301 checks the indication information in step S420 and performs a state transition operation to the RRC connected state. When the state transition is completed during the state transition process to the RRC connection state, the terminal 301 indicates that the terminal 301 stores IDLE mode measurement result information in an RRC connection setup complete message or an RRC connection resumption complete message. The indication information is transmitted to the base station 302 (S430).

The base station 302 may check the existence indication information and transmit a terminal information request message to the terminal 301 to request transmission of IDLE mode measurement result information (S440). The terminal 301 transmits IDLE mode measurement result information to the base station 302 by including the terminal information response message in step S450.

Through this process, the terminal 301 may provide the cell-based or carrier-specific measurement results to the base station 302 in a short time after the state transition from the RRC IDLE mode to the RRC connected mode. Accordingly, the base station 302 may determine whether to configure carrier aggregation in the terminal 301 at a short time, and may perform a carrier aggregation configuration procedure.

This embodiment described with reference to FIGS. 1 to 4 will be described with reference to a base station.

5 is a diagram for describing an operation of a base station according to an exemplary embodiment.

Referring to FIG. 5, the base station may perform the step of generating IDLE mode measurement configuration information for measuring a channel state in the RRC IDLE mode of the UE (S510). For example, the IDLE mode measurement configuration information may include at least one of measurement target carrier frequency information, measurement duration information, target cell list information, and measurement reference value information for the UE to perform a measurement operation in the RRC IDLE mode. . As another example, the IDLE mode measurement configuration information may include valid region information including a cell list for indicating whether to maintain the RRC IDLE mode measurement operation of the terminal according to the cell reselection operation of the terminal.

The base station may perform the step of transmitting the IDLE mode measurement configuration information to the terminal by including the system information block 5 or the RRC connection release message (S510). The base station may transmit the measurement configuration information necessary for performing the measurement operation for the cell or carrier described above in the RRC IDLE state to the terminal. The IDLE mode measurement configuration information may be transmitted in an RRC connected state of the UE or may be transmitted in an RRC release operation process.

The base station may transmit IDLE mode measurement configuration information through a system information block 5 or an RRC connection release message.

For example, the base station may transmit the above-described IDLE mode measurement configuration information through the system information block 5 signal. As another example, the base station may transmit the IDLE mode measurement configuration information through the RRC connection release message received during the state transition process from the RRC connected mode to the RRC IDLE mode. As another example, the base station may transmit information included in the IDLE mode measurement configuration information through different signals. Specifically, the base station transmits at least one information of the carrier frequency information, the target cell list information, the measurement reference value information and the effective area information through the system information block 5 signal, and the measurement duration information through the RRC connection release message. Can transmit That is, the base station may separate and transmit IDLE mode measurement configuration information through a plurality of signals.

Meanwhile, the measurement duration information may include valid time information for limiting the RRC IDLE mode measurement operation of the terminal, and the target cell list information may include one or more physical cell identification information. The valid time information is applied to a timer and configured in the terminal, and the terminal may determine whether to execute the RRC IDLE mode measurement operation and store / apply the IDLE mode measurement configuration information according to the operation or expiration of the timer.

Thereafter, the terminal may measure the channel state of the cell or the carrier using the IDLE mode measurement configuration information in the RRC IDLE mode, and may store the result value as IDLE mode measurement result information.

The base station may perform the step of receiving the IDLE mode measurement result information measured based on the IDLE mode measurement configuration information in the RRC IDLE mode (S510). The base station may include information on the measurement result measured by the terminal according to the RRC IDLE mode measurement operation in the IDLE mode measurement result information and receive the terminal after the state transition to the RRC connected state.

For example, when the UE completes the state transition from the RRC IDLE mode to the RRC connected state, the base station may receive IDLE measurement result information from the UE including the RRC connection setup complete message or the RRC connection resumption complete message. A detailed operation for the base station to receive IDLE mode measurement result information will be described with reference to FIG. 6 below.

6 is a diagram for describing a detailed operation of a base station for receiving IDLE mode measurement result information according to an exemplary embodiment.

Referring to FIG. 6, the base station may perform a step of transmitting a system information block 2 including indication information indicating that base station processing for IDLE mode measurement result information is possible (S610). For example, the base station may broadcast the system information block 2 including indication information indicating that the base station can receive and process IDLE mode measurement result information. When the UE receives the system information block 2 (SIB 2) including the above-mentioned indication information from the base station, the UE checks the indication information and recognizes that the base station can receive IDLE mode measurement result information.

The base station may perform the step of receiving the presence indication information indicating the existence of the IDLE mode measurement result information during the RRC connection setup process of the terminal (S620). For example, the UE may perform a state transition operation from the RRC IDLE mode to the RRC connected mode for any reason (for example, a connection state transition event trigger). In the state transition process of the terminal to the RRC connection state, the base station performs an RRC connection setup procedure or an RRC connection resumption procedure with the terminal.

The base station receives existence indication information from the terminal indicating that the IDLE mode measurement result information is stored in the terminal in the RRC connection setup procedure or the RRC connection resume procedure. For example, the base station may include the presence indication information in the RRC connection setup complete message. For another example, the base station may receive the presence indication information in the RRC connection resumption completion message. As such, the terminal proceeds to the state transition in the RRC connected mode, the base station receives the presence indication information in the message indicating that the state transition is complete. Through this, the base station recognizes that the terminal stores the IDLE mode measurement result information measured in the RRC IDLE mode.

The base station may perform a step of transmitting a terminal information request message requesting IDLE mode measurement result information (S630). For example, the base station receives the existence indication information, confirms that the IDLE mode measurement result information is included in the corresponding terminal, and transmits a terminal information request message to the terminal in order to receive the IDLE mode measurement result information. That is, the base station transmits a message for requesting IDLE mode measurement result information to the terminal.

The base station compares the measurement result value for each cell measured in the RRC IDLE mode with the measurement reference value information included in the IDLE mode measurement configuration information, and stores the measurement result value for the cell exceeding the measurement reference value. In operation S640, the terminal may receive a terminal information response message including the information. For example, the base station may receive a terminal information response message including IDLE mode measurement result information in response to the terminal request message transmitted in step S630. Through this, the base station can obtain information about the measurement result measured by the terminal in the RRC IDLE state.

As described with reference to FIGS. 1 to 6, the present embodiments present a detailed procedure for the UE to perform a quality measurement for a cell or a carrier in an RRC IDLE state and deliver it to a base station in an RRC connection process. Through this, the base station can reduce the time required for the procedure for adding a carrier to the terminal, and by limiting the RRC IDLE measurement operation through a timer, the terminal can support the fast carrier addition operation while preventing unnecessary power waste. .

Hereinafter, various embodiments will be described for each procedure, including the embodiments described above. Each embodiment described below may be applied individually or in combination with each other.

RRC IDLE status of the terminal Scell  Embodiment for IDLE mode measurement configuration information indication for measurement

A method of indicating configuration information necessary for the UE to perform a measurement operation on the SCell in order to reduce the SCell setup time in the RRC IDLE state will be described.

After the base station transitions to the RRC connected state of the RRC IDLE state terminal camped in a specific cell, cell list information (neighbor cell / cancell cell / candidate cell /) that can be configured as additional cells through the cell in order to reduce the SCell setup time. Candidate cell frequency / candidate frequency) and related information can be broadcast through system information.

For example, the base station may configure additional cells to reduce the SCell setup time in the system frequency information selected for system selection block 3 (SystemInformationBlockType3) as well as intra frequency reselection information for intra frequency, inter frequency or inter-RAT cell selection. Broadcasting may include information on candidate cells.

As another example, the base station is configured with additional cells to reduce the SCell setup time to the inter-frequency reselection information provided through the system information block 5 (SystemInformationBlockType5), that is, other E-UTRAN frequencies and inter-frequency neighbor cell information for cell reselection. Broadcasting can be performed including candidate cell information.

As another example, the base station may broadcast information about a candidate cell that may be configured as an additional cell to reduce the SCell setup time through other system information distinguished from the above-described system information block 5 (SystemInformationBlockType5).

As another example, the base station may transmit IDLE mode measurement configuration information to reduce the SCell setup time through one or more of the above-described system information.

The IDLE mode measurement configuration information includes secondary candidate cell frequency, subcell index information, cell identification information (Cell ID), physical cell identification information, subfrequency ID, and cell indication field (consist of integer value) / carrier indicator field for each secondary candidate cell. / cgi-info (cellGlobalId, trackingAreaCode, plmn-Identitylist, frequency band indication information, LAN-based paging area / code information) information, LAA cell identification information, discovery signal measurement timing configuration (measDS-Config: dmtc-PeriodOffset, ds-OccasionDuration , MeasCSI-RS-Id, MeasCSI-RS-Config), measurement band information, measurement period information, measurement item / target / reference symbol / division information (RSRP / RSRQ / RSSI / CRS / CSI-RS / NR SS / beam ID) / Discovery signal), a condition for evaluating a measured value, LAA band band / LAA channel number and at least one of the indication information for the channel number may include information.

As another example, the base station may transmit some of the various information included in the above-described IDLE mode measurement configuration information in the RRC connection release message for transitioning the RRC connected state terminal to the RRC IDLE state. For example, the base station is a SCellConfiguration (subframeStartPosition, laa-SCellSubframeConfig) for reducing the SCell setup time by the RRC IDLE mode terminal through the RRC connection release message, out of the validity information of the low-latency reporting and valid time information of the low-latency reporting At least one piece of information may be indicated to the terminal.

The low latency measurement or low latency reporting operation of RRC IDLE mode UE (reporting operation for measurement and measurement result in RRC IDLE mode) increases the power consumption of the UE. Therefore, there is a need for a method for the UE to limit low latency measurement or low latency reporting operation. For example, the aforementioned measurement candidate cell list is instructed to the terminal through the physical cell identification information of each cell and used to limit the target cell or the effective cell area in which the terminal performs low latency measurement. The terminal may perform measurement only on the cell having the indicated physical cell identification information. Alternatively, when the UE moves out of the cell having the indicated physical cell identification information and moves to another cell, the terminal may stop the low latency measurement or release the measurement configuration for the low latency measurement.

For another example, the effective time for the low latency measurement described above is used to limit the IDLE mode measurement time of the terminal. When the valid time for low latency measurement indicated by the base station is received, the terminal may start the timer through the corresponding value and perform IDLE mode measurement only while the timer is running.

For another example, the conditions for evaluating the measurement value described above are used to limit IDLE mode measurement reporting of the terminal. The UE may perform measurement reporting only on cells exceeding a threshold for evaluating measurement values, thereby preventing unnecessary measurement reporting.

As another example, the base station may include at least one of the above-described IDLE mode measurement configuration information on message 4 (eg, RRC Connection Setup or RRC Connection Resume or RRC Connection reestablishment message) of the RRC connection setup process.

As the identification information of the aforementioned cell, at least one of physical cell identifier, global cell identifier, cell index, SCellindex, Servcellindex, cell indicator field (consist of integer value) and carrier indicator field may be used. The terminal may report the IDLE mode measurement result information to the base station including one or more of the above-described identification information.

Meanwhile, the above-described IDLE mode measurement configuration information may include measurement duration information (measuring period information) for efficient measurement and power saving of the terminal.

For example, the aforementioned measurement duration information may be indicated to the terminal with a different value for each cell-specific DRX cycle length. As another example, the aforementioned measurement duration information may be preconfigured in the terminal with a different value for each cell-specific DRX cycle length. As another example, the aforementioned measurement duration information may be indicated to the terminal with a different value for each UE-specific DRX cycle length. As another example, the aforementioned measurement duration information may be preconfigured in the terminal with a different value for each UE-specific DRX cycle length. As another example, the aforementioned measurement duration information may be indicated to the terminal with a different value for each UE-specific DRX cycle length configured by the base station for RAN based paging. As another example, the aforementioned measurement duration information may be preconfigured in the terminal with a different value for each UE-specific DRX cycle length configured by the base station for RAN based paging.

As described above, the measurement duration information may be indicated to the terminal through an RRC connection release message.

RRC IDLE status UE transmits IDLE mode measurement result information after RRC connection setup

The UE may perform a procedure for transmitting the IDLE mode measurement result information to the base station in the state transition process from the RRC IDLE mode to the RRC connected mode.

For example, the reporting configuration for transmitting the IDLE mode measurement result information may be indicated through configuration information separate from the measurement configuration information. For example, the reporting configuration may be provided through another system information block type that is distinguished from the system information block type that provides IDLE mode measurement configuration information. Alternatively, when the reporting configuration information is provided through the same system information block type as the system information block type providing the IDLE mode measurement configuration information, the reporting configuration information may be provided through other information elements that are distinguished from the measurement configuration information elements. Alternatively, the reporting configuration information may be transmitted through an RRC dedicated message. For example, the reporting configuration information may be included in the RRC connection release message or the RRC connection setup message, and may be provided through an information element different from the measurement configuration information.

Meanwhile, the base station may transmit information for controlling reporting of IDLE mode measurement result information to the terminal in order to efficiently measure or report the terminal, or reduce power.

For example, the IDLE mode measurement result information transmitted through the above-described system information or RRC dedicated message may include one or more of the following information.

The information is radio quality information (or measurement result information or help information for cell configuration or help information for cell activation) such as terminal identification information, measurement result sub frequency information (measResultsServFreq) information, measurement result frequency information, and secondary candidate cell frequency information. , Subcell index for each secondary candidate cell, cell identification information (Cell ID), physical cell identification information, sub frequency ID, cell indicator field (consist of integer value) / carrier indicator field / LAA cell identification information / cgi-info (cellGlobalId , trackingAreaCode, plmn-Identitylist, frequency band indication information, LAN-based paging area / code information), discovery signal measurement timing configuration (measDS-Config: dmtc-PeriodOffset, ds-OccasionDuration, MeasCSI-RS-Id, MeasCSI-RS-Config ), Measurement band information, measurement period information, measurement item / target / reference symbol / division (RSRP / RSRQ / RSSI / CRS / CSI-RS / NR SS / beam ID / discovery signal), conditions / parameters for evaluation of measured values / Threshold / event, LAA-SCellConfiguration (subframeStartPosition, laa-SCellSubframeConfig), RSRP result, RSRQ result, RSRP-range, RSSI, CSI-RS measurement result, NR SS measurement result, NR CSI-RS measurement result, measurement event (e.g. A1, A2, A3, A4, A5, A6 measurement event) or threshold for determining the configuration / activation / deactivation of the secondary cell / cell / cell group, whether or not the threshold for each cell is satisfied, and cell quality priority information for each cell (e.g., For example, priority information of each cell of the cell to be activated, information on cell quality of each cell (for example, information for indicating high / medium / low, activable / good / excellent), information on coding / abstraction of measurement results by cell, and quality by cell Range of measurement results (range / scale / code), configurable / activated secondary cell set / list, best measurement result SCell / Cell / frequency information (best measurement result cell information or more than a certain number of best measurement result cell information), best measurement Measurement result of the result cell (rsrpResult, rsrqResult, rs-sinr-Result, best b eam ID,) or more than a certain number of best measurement results (rsrpResult, rsrqResult, rs-sinr-Result, more than a certain number of best beam ID / best beam measurement results, NR SS measurement results, NR CSI-RS measurement results), The number of beams in a specific range, the number of beams and the specific range, the number of averaging of measurement results, the minimum number of measurement results, the last measurement result, the last measurement time, and the last measurement time. The information may include one or more of elapsed time, terminal location in measurement, valid time of early measurement, and early reporting.

Meanwhile, the terminal may transmit the above-described IDLE mode measurement result information to the base station after the RRC connection setup process or the RRC connection setup is completed.

For example, the UE may transmit IDLE mode measurement result information to the base station on the RRC Connection Setup complete message during the RRC connection setup process.

As another example, the terminal may transmit the IDLE mode measurement result information to the base station on the RRC Connection Request message during the RRC connection setup process.

As another example, when the base station instructs the message including the above-mentioned information on the message 4 (for example, RRC Connection Setup or RRC Connection Resume or RRC Connection reestablishment message) during the RRC connection setup process, the UE indicates the message 5 ( For example, the above-described IDLE mode measurement result information may be transmitted to the base station on the RRC Connection Setup complete or RRC Connection Resume Complete message).

As another example, when the base station broadcasts indication information indicating that the base station can process the IDLE mode measurement result information through the system information, the terminal is a message 5 (for example, RRC Connection Setup complete or RRC Connection in the RRC connection setup process) Resume Complete message) may be transmitted including the existence indication information indicating that the terminal stores the IDLE mode measurement result information.

As another example, when the base station has completed the RRC connection setup of the terminal and confirms that the terminal stores the IDLE mode measurement result information on message 5, the base station transmits a terminal information request message to the terminal to request IDLE mode measurement result information. Can be. The terminal may transmit a terminal information response message including IDLE mode measurement result information in response to the terminal information request message.

When the base station receives IDLE mode measurement result information through the above procedure, the base station may provide the SCell configuration to the terminal based on the IDLE mode measurement result information. That is, the base station may provide the secondary base station configuration or the secondary base station SCell configuration to the terminal based on the above-described IDLE mode measurement result information.

If you want to configure the base station to send user data over the SCell for a particular radio flow or for a specific PDU session or for a core network bearing (or E-RAB, or a specific radio flow group), you must activate that cell. do.

As an example for this purpose, the base station may be configured in the terminal by setting the activation state of the cell to be activated or deactivated for each cell. As another example, the base station may configure the UE by setting an activation state of the cell group to be activated or deactivated for a specific cell group. As another example, the base station may be configured in the terminal by setting the activation state for all cells to be activated or deactivated.

Method for controlling the measurement operation in the RRC IDLE mode of the terminal

As described above, when the UE performs the cell measurement operation in the RRC IDLE mode, power consumption for this may be caused. In addition, overhead and system load associated with transmission of IDLE mode measurement result information may be increased.

Therefore, measures to reduce such power consumption, overhead, and system load are also required.

For example, the base station may transmit information allowing the measurement operation or the measurement result reporting operation in the RRC IDLE mode through the system information. For example, the allowable information may be configured by 1 bit or 2 bits to indicate whether to allow the measurement operation or the measurement result reporting operation in the RRC IDLE mode. If the base station indicates information that allows the measurement operation or the measurement result reporting operation in the RRC IDLE mode, the terminal may perform a procedure for this. Or, if the base station indicates the information to allow the measurement operation or measurement result reporting operation in the RRC IDLE mode, the terminal provides IDLE mode measurement configuration information for indicating a measurement operation or measurement result reporting operation in the RRC IDLE mode Can be received. Or, if the base station indicates information that allows the measurement operation or the measurement result reporting operation in the RRC IDLE mode, if the UE RRC IDLE mode operation capability (for example, low latency measurement capability or low latency reporting capper The terminal may receive the IDLE mode measurement configuration information. Alternatively, the terminal may perform a procedure for a measurement operation or a measurement result reporting operation in the RRC IDLE mode.

For another example, if the terminal has a related configuration for performing a measurement operation or a measurement result reporting operation in the RRC IDLE mode, the terminal provides system information for indicating a measurement operation or a measurement result reporting operation in the RRC IDLE mode Can be received. Alternatively, the terminal may perform a procedure for a measurement operation or a measurement result reporting operation in the RRC IDLE mode. For example, the base station may instruct the terminal to apply IDLE mode measurement configuration information, IDLE mode measurement result reporting configuration information or specific terminal configuration information to the terminal through RRC signaling. Alternatively, the MME may instruct the terminal to configure IDLE mode measurement configuration information, IDLE mode measurement result reporting configuration information or specific terminal configuration information to the terminal through NAS signaling.

For another example, the base station may include information for limiting the measurement operation or the measurement result reporting operation in the RRC IDLE mode in the IDLE mode measurement configuration information to indicate to the terminal. For example, the base station may instruct the terminal to measure the aforementioned measurement duration information so that the IDLE mode measurement configuration information is configured in the terminal only for a predetermined time. The measurement duration information may be transmitted separately from other IDLE mode measurement configuration information. For example, the IDLE mode measurement configuration information may be indicated to the terminal through the system information block 5, and the measurement duration information may be indicated to the terminal through the RRC connection release message.

For another example, if the base station is set to indicate that the information to allow the measurement operation or measurement result reporting operation in the RRC IDLE mode to indicate that, the UE in the RRC IDLE mode measurement operation or measurement result reporting operation It does not start the reception of the relevant configuration information for, or ignore / remove / delete / discard the configuration information.

For another example, if the base station transmits the above-described system information for the measurement operation or measurement result reporting operation in the RRC IDLE mode, the terminal is a procedure for the measurement operation or measurement result reporting operation in the RRC IDLE mode Can be done. That is, when the IDLE mode measurement configuration information is broadcast by the base station, the terminal may perform a measurement operation or a measurement result reporting operation in the RRC IDLE mode.

Cell Reselection  Terminal operation method according to

For example, the base station may instruct the terminal by including IDLE mode measurement configuration information for reducing the SCell setup time of the RRC IDLE state terminal in the RRC connection release message. The terminal applies or stores the received IDLE mode measurement configuration information. Meanwhile, the idle state terminal may perform a cell reselection operation to a new cell as the terminal moves. In this case, the terminal may release or delete the IDLE mode measurement configuration information or the IDLE mode measurement result reporting configuration information. The UE may perform the above-described operations for IDLE mode measurement configuration or IDLE mode measurement result reporting configuration through system information of the cell selected as the mobile device moves. Alternatively, the terminal may update some or all parameters of the IDLE mode measurement configuration information of the previous cell stored through the system information broadcast in the reselected cell.

As another example, the base station may indicate IDLE mode measurement configuration information for reducing the SCell setup time of the RRC IDLE state terminal in the system information (eg, SIB5) to the terminal. The terminal applies or stores the received IDLE mode measurement configuration information. Meanwhile, the idle state terminal may perform a cell reselection operation to a new cell as the terminal moves. In this case, the terminal may release or delete the IDLE mode measurement configuration information or the IDLE mode measurement result reporting configuration information. The UE may perform the above-described operations for IDLE mode measurement configuration or IDLE mode measurement result reporting configuration through system information of the cell selected as the mobile device moves. Alternatively, the terminal may update some or all parameters of the IDLE mode measurement configuration information of the previous cell stored through the system information broadcast in the reselected cell.

As another example, the base station may indicate IDLE mode measurement configuration information for reducing the SCell setup time of the RRC IDLE state terminal in the RRC connection release message or system information (eg, SIB5) to the terminal. The terminal applies or stores the received IDLE mode measurement configuration information. Meanwhile, the idle state terminal may perform a cell reselection operation to a new cell as the terminal moves. The terminal uses the IDLE mode measurement configuration information stored when the terminal enters an RRC connection state, when the terminal performs a PLMN selection performed at the request of the NAS, or when the terminal selects a different PLMN from the corresponding cell, or when the terminal selects a different radio When the access technology (RAT) is selected or when the valid time received by the terminal through the message expires, the terminal may release or delete measurement configuration information or reporting configuration information. The UE may perform the above-described operations for IDLE mode measurement configuration or IDLE mode measurement result reporting configuration through system information of the cell selected as the mobile device moves. Alternatively, the terminal may update some or all parameters of the IDLE mode measurement configuration information of the previous cell stored through the system information broadcast in the reselected cell.

As such, when the cell reselection operation occurs, the terminal may update the configuration related to the RRC IDLE measurement operation or release the configuration related to the previous measurement operation and apply the new configuration based on the newly selected cell.

RRC IDLE considering terminal status mode  Measurement configuration information indicating method and terminal operation method

The base station may transmit one or more IDLE mode measurement configuration information in consideration of the terminal state or the terminal capability. For example, the plurality of IDLE mode measurement configuration information is transmitted in consideration of the mobility state of the terminal, and the terminal may select any one of the IDLE mode measurement configuration information based on its mobility state.

For example, the base station may indicate the IDLE mode measurement configuration information for each MobilityState of the terminal to the terminal.

As another example, the base station may indicate to the terminal IDLE mode measurement configuration information for each power preference (PowerPreference) of the terminal. For example, when the power preference of the terminal is set as the power saving preference, the terminal may ignore one or more configuration information among the plurality of IDLE mode measurement configuration information. Alternatively, when the power preference of the terminal is set to not being a power saving preference, the terminal may perform an operation according to IDLE mode measurement configuration information.

As another example, the base station may instruct the terminal with information for instructing the procedure having the above-described IDLE mode measurement configuration information to be performed to the terminal having a specific capability. For example, information for instructing the 5G / NR capable terminal or the EN-DC capable terminal or the CA capable terminal to perform the procedure using the above-described IDLE mode measurement configuration information may be instructed to the terminal. The terminal supporting the capability may perform an operation according to IDLE mode measurement configuration information. The terminal that does not support the capability may ignore the IDLE mode measurement configuration information.

As another example, the terminal may transmit the terminal capability information indicating that the terminal supports the measurement operation in RRC IDLE mode and the operation of reporting the measurement result to the base station. For example, the terminal may transmit the terminal capability information in the RRC connection request message (MSG 3). Alternatively, the terminal may transmit the terminal capability information including the RRC connection setup complete message (MSG 5). Alternatively, the terminal may transmit to the base station through the terminal capability transfer procedure. Alternatively, the terminal may transmit the terminal capability information to the base station through the MME.

As described above, the base station controls the UE to perform a cell or carrier channel state measurement operation in the RRC IDLE mode, and after receiving the measurement result information quickly after the UE transition to the RRC connected state, data transmission through the SCell is Can be done to run quickly. Through this, the present disclosure provides an effect of increasing the data offloading effect of the terminal.

Hereinafter, a device of a terminal and a base station capable of performing all or part of each of the above-described embodiments will be described once again with reference to the drawings.

7 is a diagram illustrating a terminal device according to an exemplary embodiment.

Referring to FIG. 7, the terminal 700 performing the measurement operation in the RRC IDLE mode includes a receiver 730 for receiving IDLE mode measurement configuration information for measuring the channel state in the RRC IDLE mode from the base station and IDLE mode measurement. The control unit 710 may store or apply the configuration information, and the transmitter 720 may transmit the IDLE mode measurement result information measured based on the IDLE mode measurement configuration information in the RRC IDLE mode to the base station.

For example, the receiver 730 may receive measurement configuration information necessary for performing the measurement operation on the cell or carrier described above from the base station in the RRC IDLE state. The IDLE mode measurement configuration information may be received in an RRC connected state of the UE or may be received in an RRC release operation process.

For example, the IDLE mode measurement configuration information may include at least one of measurement target carrier frequency information, measurement duration information, target cell list information, and measurement reference value information for the UE to perform a measurement operation in the RRC IDLE mode. .

As another example, the IDLE mode measurement configuration information may include valid region information including a cell list for indicating whether to maintain the RRC IDLE mode measurement operation of the terminal according to the cell reselection operation of the terminal.

The receiver 730 may receive IDLE mode measurement configuration information through a system information block 5 or an RRC connection release message.

For example, the receiver 730 may receive the above-described IDLE mode measurement configuration information through the system information block 5 signal. As another example, the receiver 730 may receive IDLE mode measurement configuration information through an RRC connection release message received during a state transition process from the RRC connection mode to the RRC IDLE mode. As another example, the receiver 730 may receive information included in the IDLE mode measurement configuration information through different signals. In detail, the receiver 730 receives at least one of measurement target carrier frequency information, target cell list information, measurement reference value information, and effective area information through a system information block 5 signal, and continues measurement through an RRC connection release message. Time information can be received.

Meanwhile, the measurement duration information may include valid time information for limiting the RRC IDLE mode measurement operation of the terminal, and the target cell list information may include one or more physical cell identification information. The valid time information is applied to a timer and configured in the terminal, and the controller 710 may determine whether to execute the RRC IDLE mode measurement operation and store / apply the IDLE mode measurement configuration information according to the operation or expiration of the corresponding timer.

In addition, the controller 710 may control the RRC IDLE mode measurement operation by storing or applying the IDLE mode measurement configuration information received through the system information block 5 or the RRC connection release message. The RRC IDLE mode measurement operation may be performed after the UE completes state transition from the RRC connected state to the RRC IDLE state. For example, the controller 710 may perform an RRC IDLE mode measurement operation on a carrier frequency to be measured when a timer having an effective time is operated according to measurement duration information included in IDLE mode measurement configuration information. Alternatively, the controller 710 may release the received IDLE mode measurement configuration information when the timer for which the valid time is set expires. For example, the controller 710 may delete or deactivate IDLE mode measurement configuration information to which a corresponding timer is applied.

In addition, the controller 710 may store the measurement result value for each cell or carrier acquired according to the RRC IDLE mode measurement operation in the terminal. The stored measurement result value may be included in IDLE mode measurement result information.

According to the RRC IDLE mode measurement operation, the control unit 710 measures the channel state (or channel quality) for the cell or carrier to be measured, and the transmitter 720 includes information on the measured result in IDLE mode measurement result information. If the state transition is made to the RRC connection state can be transmitted to the base station. For example, when the state transition is completed from the RRC IDLE mode to the RRC connected state, the transmitter 720 may include IDLE measurement result information in the RRC connection setup complete message or the RRC connection resume complete message to the base station.

The controller 710 may measure the channel state of the carrier or cell to be measured based on the IDLE mode measurement configuration information. In addition, the controller 710 may store the measurement result value for the cell or carrier exceeding the measurement reference value by comparing the measurement reference value included in the IDLE mode measurement result information with the measurement result value of each measured cell or carrier.

The receiver 730 may further receive the system information block 2 including the indication information indicating that the base station can receive and process the IDLE mode measurement result information. In addition, the receiver 730 may further receive a terminal information request message for requesting IDLE mode measurement result information from the base station.

The transmitter 720 may transmit the presence indication information indicating the existence of the IDLE mode measurement result information to the base station in the RRC connection setup process, and include the IDLE mode measurement result information in the terminal information response message to the base station. For example, the transmitter 720 may include the existence indication information in the RRC connection setup complete message or the RRC connection resume complete message.

In addition, the transmitter 720 and the receiver 730 are used to transmit and receive signals, messages, and information necessary for performing the above-described embodiments with the base station. On the other hand, the control unit 710 controls the overall operation of the terminal 700 in the channel measurement operation in the RRC IDLE mode of the terminal required to perform the above-described embodiment and a method for reporting it to the base station.

8 is a diagram illustrating a base station apparatus according to an embodiment.

Referring to FIG. 8, the base station 800 for controlling the RRC IDLE mode measurement operation of the terminal includes a control unit 810 and IDLE mode measurement configuration for generating IDLE mode measurement configuration information for measuring a channel state in the RRC IDLE mode of the terminal. A transmitter 820 for transmitting the information to the UE by including the information in the system information block 5 or the RRC connection release message; and a receiver 830 for receiving the measured IDLE mode measurement result information based on the IDLE mode measurement configuration information in the RRC IDLE mode. It may include.

The transmitter 820 may transmit a system information block 2 including indication information indicating that base station processing for IDLE mode measurement result information is possible, and transmit a terminal information request message for requesting IDLE mode measurement result information.

The reception unit 830 may receive existence indication information indicating the existence of IDLE mode measurement result information and receive a terminal information response message including IDLE mode measurement result information during an RRC connection setup process of the terminal. For example, the receiver 830 may receive the RRC connection setup complete message or the RRC connection resumption complete message by including the existence indication information.

In addition, the transmitter 820 and the receiver 830 are used to transmit and receive signals, messages, and information necessary for performing the above-described embodiments. Meanwhile, the controller 810 controls the overall operation of the base station 800 in the channel measurement operation in the RRC IDLE mode of the terminal required to perform the above-described embodiment and a method for reporting the same to the base station.

The terms "system", "processor", "controller", "component", "module", "interface", "model", and "unit" described above generally refer to a combination of computer-related entity hardware, hardware, and software. Can mean software or running software. For example, the aforementioned components may be, but are not limited to, a process driven by a processor, a processor, a controller, a control processor, an object, an execution thread, a program, and / or a computer. For example, both an application running on a controller or processor and a controller or processor can be components. One or more components can reside within a process and / or thread of execution and a component can be located on one system or deployed on more than one system.

The standard contents or standard documents mentioned in the above embodiments are omitted to simplify the description of the specification and form a part of the present specification. Therefore, the addition of the contents of the above standards and some of the standard documents to the specification or the claims should be construed as falling within the scope of the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Claims (24)

In the method for the terminal performs the measurement operation in the RRC IDLE mode,
Receiving, by the terminal, IDLE mode measurement configuration information for measuring a channel state in an RRC IDLE mode from a base station;
Storing or applying the IDLE mode measurement configuration information; And
And transmitting the IDLE mode measurement result information measured based on the IDLE mode measurement configuration information in the RRC IDLE mode to the base station,
The step of transmitting to the base station,
The measurement result value for each cell measured in the RRC IDLE mode is compared with the measurement reference value information included in the IDLE mode measurement configuration information, and the measurement result value for the cell exceeding the measurement reference value is stored as the IDLE mode measurement result information. Making;
Receiving system information block 2 including indication information indicating that base station processing for the IDLE mode measurement result information is possible;
Transmitting existence indication information indicating existence of the IDLE mode measurement result information to the base station in an RRC connection setup process of the terminal; And
And when the terminal information request message is received from the base station, including the IDLE mode measurement result information in a terminal information response message and transmitting the terminal information response message to the base station. The method of claim 1,
The IDLE mode measurement configuration information,
Included in System Information Block 5 or RRC disconnect message.
And at least one of measurement target carrier frequency information, measurement duration information, target cell list information, and measurement reference value information for the terminal to perform a measurement operation in an RRC IDLE mode. The method of claim 2,
The measurement duration information includes valid time information for limiting the RRC IDLE mode measurement operation of the terminal,
The target cell list information includes one or more physical cell identification information. The method of claim 1,
The IDLE mode measurement configuration information,
And valid region information including a cell list for indicating whether to maintain the RRC IDLE mode measurement operation of the terminal according to a cell reselection operation of the terminal. The method of claim 1,
The storing or applying the IDLE mode measurement configuration information may include:
And performing a RRC IDLE mode measurement operation on a carrier frequency to be measured when a timer having an effective time is operated according to measurement duration information included in the IDLE mode measurement configuration information. The method of claim 5, wherein
The IDLE mode measurement configuration information,
When the timer expires. delete The method of claim 1,
The existence indication information,
Method included in the RRC connection setup complete message or the RRC connection resume complete message. In the method for the base station to control the RRC IDLE mode measurement operation of the terminal,
Generating IDLE mode measurement configuration information for measuring a channel state in an RRC IDLE mode of the UE;
Transmitting the IDLE mode measurement configuration information to the terminal by including the system information block 5 or an RRC connection release message; And
Receiving IDLE mode measurement result information measured based on the IDLE mode measurement configuration information in the RRC IDLE mode,
Receiving the IDLE mode measurement result information,
Transmitting system information block 2 including indication information indicating that base station processing for the IDLE mode measurement result information is possible;
Receiving existence indication information indicating the existence of the IDLE mode measurement result information during an RRC connection setup process of the terminal;
Transmitting a terminal information request message requesting the IDLE mode measurement result information; And
The IDLE mode measurement result information storing the measurement result value for the cell exceeding the measurement reference value by comparing the measurement result value for each cell measured in the RRC IDLE mode with the measurement reference value information included in the IDLE mode measurement configuration information. Receiving a terminal information response message comprising a. The method of claim 9,
The IDLE mode measurement configuration information,
RRC IDLE mode measurement operation of the terminal according to the measurement target carrier frequency information, measurement duration information, target cell list information, measurement reference value information and the cell reselection operation of the terminal for the UE to perform the measurement operation in the RRC IDLE mode And at least one piece of valid region information including a cell list for indicating whether or not to maintain a cell. delete The method of claim 9,
The existence indication information,
Method included in the RRC connection setup complete message or the RRC connection resume complete message. In the terminal performing the measurement operation in the RRC IDLE mode,
A receiver for receiving, by the terminal, IDLE mode measurement configuration information for measuring a channel state in an RRC IDLE mode from a base station;
A controller configured to store or apply the IDLE mode measurement configuration information; And
In the RRC IDLE mode includes a transmitter for transmitting the IDLE mode measurement result information measured based on the IDLE mode measurement configuration information to the base station,
The controller compares the measurement result value for each cell measured in the RRC IDLE mode with the measurement reference value information included in the IDLE mode measurement configuration information, and measures the IDLE mode for the measurement result value for the cell exceeding the measurement reference value. Save it as result information,
The receiver further receives a system information block 2 and a terminal information request message including indication information indicating that base station processing for the IDLE mode measurement result information is possible.
The transmitter transmits existence indication information indicating the existence of the IDLE mode measurement result information to the base station in an RRC connection setup process of the terminal, and includes the IDLE mode measurement result information in a terminal information response message to the base station. Terminal characterized in that for transmitting. The method of claim 13,
The IDLE mode measurement configuration information,
Included in System Information Block 5 or RRC disconnect message.
And the terminal comprises at least one of measurement target carrier frequency information, measurement duration information, target cell list information, and measurement reference value information for performing a measurement operation in an RRC IDLE mode. The method of claim 14,
The measurement duration information includes valid time information for limiting the RRC IDLE mode measurement operation of the terminal,
The target cell list information terminal, characterized in that it comprises one or more physical cell identification information. The method of claim 13,
The IDLE mode measurement configuration information,
And effective area information including a cell list for indicating whether to maintain the RRC IDLE mode measurement operation of the terminal according to the cell reselection operation of the terminal. The method of claim 13,
The control unit,
And performing the RRC IDLE mode measurement operation on the carrier frequency to be measured when a timer having an effective time is operated according to the measurement duration information included in the IDLE mode measurement configuration information. The method of claim 17,
The IDLE mode measurement configuration information,
Terminal is released when the timer expires. delete The method of claim 13,
The existence indication information,
Terminal included in the RRC connection setup complete message or RRC connection resumption completion message and transmitted. In the base station for controlling the RRC IDLE mode measurement operation of the terminal,
A controller configured to generate IDLE mode measurement configuration information for measuring a channel state in an RRC IDLE mode of a terminal;
A transmitter for including the IDLE mode measurement configuration information in a system information block 5 or an RRC connection release message and transmitting it to the terminal; And
In the RRC IDLE mode includes a receiving unit for receiving IDLE mode measurement result information measured based on the IDLE mode measurement configuration information,
The transmitting unit,
Transmitting a system information block 2 including indication information indicating that base station processing for the IDLE mode measurement result information is possible, transmitting a terminal information request message requesting the IDLE mode measurement result information,
The receiving unit,
A base station receiving presence indication information indicating the existence of the IDLE mode measurement result information during the RRC connection setup process of the terminal, and receives a terminal information response message including the IDLE mode measurement result information. The method of claim 21,
The IDLE mode measurement configuration information,
RRC IDLE mode measurement operation of the terminal according to the measurement target carrier frequency information, measurement duration information, target cell list information, measurement reference value information and the cell reselection operation of the terminal for the UE to perform the measurement operation in the RRC IDLE mode And at least one piece of information from the effective area information including a cell list for indicating whether the cell is maintained. delete The method of claim 21,
The existence indication information,
The base station, characterized in that received in the RRC connection setup complete message or RRC connection resume complete message.

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