WO2019054749A1

WO2019054749A1 - Method for measuring on the basis of csi-rs in wireless communication system and apparatus therefor

Info

Publication number: WO2019054749A1
Application number: PCT/KR2018/010688
Authority: WO
Inventors: 송화월; 이윤정
Original assignee: 엘지전자 주식회사
Priority date: 2017-09-12
Filing date: 2018-09-12
Publication date: 2019-03-21

Abstract

The present specification provides a method for measuring on the basis of a channel state information-reference signal (CSI-RS) in a wireless communication system. More specifically, the method performed by a terminal comprises: a step of transmitting, to a network, a capability information element (IE) including information on a measurement gap supported by the terminal; a step of receiving, from the network, information on a starting position for the measurement in a measurement bandwidth (measurement BW); and, when an active bandwidth part and the measurement bandwidth (measurement BW) are set to be different, a step of performing the measurement, on the basis of the CSI-RS, in the measurement bandwidth (measurement BW), during the measurement gap and from the starting position.

Description

Method and apparatus for performing measurements based on CSI-RS in a wireless communication system

The present invention relates to a wireless communication system, and more particularly, to a method of performing measurement based on a CSI-RS (channel state information-reference signal) and a device supporting the same.

The mobile communication system has been developed to provide voice service while ensuring the user 's activity. However, the mobile communication system has expanded the area from voice to data service. At present, due to an explosion of traffic, a shortage of resources is caused and users demand a higher speed service. Therefore, a more advanced mobile communication system is required .

The requirements of the next-generation mobile communication system largely depend on the acceptance of explosive data traffic, the dramatic increase in the rate per user, the acceptance of a significantly increased number of connected devices, very low end-to-end latency, Should be able to. For this purpose, a dual connectivity, a massive multiple input multiple output (MIMO), an in-band full duplex, a non-orthogonal multiple access (NOMA) wideband support, and device networking.

The present disclosure is directed to providing a method of performing measurements based on CSI-RS.

It is another object of the present invention to provide a method of providing information on a time point at which measurement is started in a measurement bandwidth (measurement BW) to a terminal.

It is another object of the present invention to provide a method of transmitting information on a measurement gap supported by a terminal to a network.

The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical subjects which are not mentioned are described in the following description, which will be clearly understood by those skilled in the art to which the present invention belongs It will be possible.

The present disclosure provides a method for performing measurements based on CSI-RS in a wireless communication system.

More specifically, a method performed by a terminal includes transmitting a capability information element (IE) to a network, the capability information element including information on a measurement gap supported by the terminal; Receiving from the network information about a starting position for performing the measurement in a measurement bandwidth (measurement BW); And based on the CSI-RS in the measurement bandwidth (measurement BW) for the measurement gap from the start position when the active bandwidth part and the measurement bandwidth (measurement BW) are set differently. and performing a measurement of the measurement result.

In addition, the method further comprises retuning a radio frequency (RF) from the active bandwidth part to the measured bandwidth.

Also, in this specification, the measurement bandwidth is a bandwidth in which the CSI-RS is set.

In the present invention, when the active bandwidth part and the measured bandwidth are set differently, the measured bandwidth is not included in the maximum bandwidth supported by the terminal, and the center frequency of the active bandwidth part and the measured bandwidth are different from each other do.

Also, in this specification, the measurement gap is determined according to a subcarrier spacing.

In addition, the method further comprises receiving data from the network on the active bandwidth part.

Further, in the present specification, the data is received based on a first RF of the terminal, and the measurement is performed based on a second RF of the terminal.

In addition, the present invention relates to a terminal performing a measurement based on a CSI-RS (Channel State Information-Reference Signal) in a wireless communication system, the terminal comprising: a Radio Frequency (RF) module for transmitting and receiving a radio signal; And a processor operatively connected to the RF module, wherein the processor is operable to transmit a capability information element (IE), including information on a measurement gap supported by the terminal, Lt; / RTI > From the network, information about a starting position for performing the measurement in a measurement bandwidth (measurement BW); And based on the CSI-RS on the measurement bandwidth (measurement BW) for the measurement gap from the start position when the active bandwidth part and the measurement bandwidth (measurement BW) are set differently. and to perform a measurement of the measurement result.

Also, the processor is configured to retune a radio frequency (RF) from the active bandwidth part to the measured bandwidth.

Also, in this specification, the processor is configured to receive data from the network on the active bandwidth part.

The present specification has the effect of enabling the measurement to be performed efficiently based on the CSI-RS using the measurement start point and the measurement gap for performing the measurement.

The effects obtained in the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description .

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the technical features of the invention.

1 is a diagram showing an example of the overall system structure of NR to which the method suggested in the present specification can be applied.

FIG. 2 illustrates a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present invention can be applied.

FIG. 3 shows an example of a resource grid supported in a wireless communication system to which the method proposed here can be applied.

4 shows an example of a self-contained subframe structure to which the method proposed herein can be applied.

5 is a flowchart showing an example of an operation method of a terminal performing the measurement proposed in the present specification.

6 illustrates a block diagram of a wireless communication device to which the methods proposed herein may be applied.

7 illustrates a block diagram of a communication apparatus according to an embodiment of the present invention.

8 is a diagram showing an example of an RF module of a wireless communication apparatus to which the method suggested in the present specification can be applied.

9 is a diagram showing another example of an RF module of a wireless communication apparatus to which the method suggested in the present specification can be applied.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details.

In some instances, well-known structures and devices may be omitted or may be shown in block diagram form, centering on the core functionality of each structure and device, to avoid obscuring the concepts of the present invention.

In this specification, a base station has a meaning as a terminal node of a network that directly communicates with a terminal. The particular operation described herein as performed by the base station may be performed by an upper node of the base station, as the case may be. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. The term 'base station' refers to a term such as a fixed station, a Node B, an evolved NodeB, a base transceiver system (BTS), an access point (AP), a gNB (general NB) Lt; / RTI > Also, a 'terminal' may be fixed or mobile and may be a mobile station (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS) Advanced Mobile Station (WT), Wireless Terminal (WT), Machine-Type Communication (MTC), Machine-to-Machine (M2M), and Device-to-Device (D2D) devices.

Hereinafter, a downlink (DL) means communication from a base station to a terminal, and an uplink (UL) means communication from a terminal to a base station. In the downlink, the transmitter may be part of the base station, and the receiver may be part of the terminal. In the uplink, the transmitter may be part of the terminal and the receiver may be part of the base station.

The specific terminology used in the following description is provided to aid understanding of the present invention, and the use of such specific terminology may be changed into other forms without departing from the technical idea of the present invention.

The following techniques may be used in various wireless communication systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC- (non-orthogonal multiple access), and the like. CDMA can be implemented with radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA can be implemented with wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). OFDMA can be implemented with wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and evolved UTRA (E-UTRA). UTRA is part of the universal mobile telecommunications system (UMTS). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is part of E-UMTS (evolved UMTS) using E-UTRA, adopting OFDMA in downlink and SC-FDMA in uplink. LTE-A (advanced) is the evolution of 3GPP LTE.

5G NR (new radio) defines enhanced mobile broadband (eMBB), massive machine type communications (mMTC), ultra-reliable low latency communications (URLLC), and vehicle-to-everything (V2X) according to the usage scenario.

The 5G NR standard distinguishes between standalone (SA) and non-standalone (NSA) depending on the co-existence between the NR system and the LTE system.

The 5G NR supports various subcarrier spacing, CP-OFDM in the downlink, CP-OFDM in the uplink, and DFT-s-OFDM (SC-OFDM).

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802, 3GPP and 3GPP2. That is, the steps or portions of the embodiments of the present invention which are not described in order to clearly illustrate the technical idea of the present invention can be supported by the documents. In addition, all terms disclosed in this document may be described by the standard document.

For clarity of description, 3GPP LTE / LTE-A / NR (New Radio) is mainly described, but the technical features of the present invention are not limited thereto.

용어 정의Term Definition

eLTE eNB: The eLTE eNB is an eNB evolution that supports connectivity to EPC and NGC.

gNB: node that supports NR as well as connection to NGC.

New RAN: A wireless access network that supports NR or E-UTRA or interacts with NGC.

Network slice: A network slice is a network defined by an operator to provide an optimized solution for a specific market scenario that requires specific requirements with end-to-end coverage.

Network function: A network function is a logical node within a network infrastructure with well-defined external interfaces and well-defined functional behavior.

NG-C: Control plane interface used for NG2 reference point between new RAN and NGC.

NG-U: User plane interface used for NG3 reference points between new RAN and NGC.

Non-standalone NR: A configuration in which gNB requests an LTE eNB as an anchor for EPC control plane connection or an eLTE eNB as an anchor for control plane connection to NGC.

Non-stand-alone E-UTRA: A deployment configuration in which the eLTE eNB requires the gNB as an anchor for the control plane connection to the NGC.

User plane gateway: Endpoint of the NG-U interface.

시스템 일반System General

Referring to FIG. 1, the NG-RAN comprises gNBs providing a control plane (RRC) protocol termination for the NG-RA user plane (new AS sublayer / PDCP / RLC / MAC / PHY) and UE do.

The gNBs are interconnected via the Xn interface.

The gNB is also connected to the NGC via the NG interface.

More specifically, the gNB is connected to an Access and Mobility Management Function (AMF) through an N2 interface and a UPF (User Plane Function) through an N3 interface.

NRNR (New Rat) (New Rat) 뉴머롤로지Nemerologie (Numerology) 및 프레임(frame) 구조(Numerology) and frame structure

Numerous numerology can be supported in NR systems. Here, the memoryless can be defined by the subcarrier spacing and the CP (Cyclic Prefix) overhead. At this time, the plurality of subcarrier intervals are set to a constant N (or alternatively,

) &Lt; / RTI > Also, although it is assumed that at very high carrier frequencies, the very low subcarrier spacing is not used, the utilized memoryless can be chosen independently of the frequency band.

In the NR system, various frame structures according to a plurality of memorylogies can be supported.

Hereinafter, an Orthogonal Frequency Division Multiplexing (OFDM) neighbors and frame structure that can be considered in an NR system will be described.

The number of OFDM neuron rolls supported in the NR system can be defined as shown in Table 1.

With respect to the frame structure in the NR system, the size of the various fields in the time domain is

Lt; / RTI > units of time. From here,

ego,

to be. The downlink and uplink transmissions are

And a radio frame having a duration of. Here, the radio frames are

And 10 subframes having a duration of < RTI ID = 0.0 > In this case, there may be a set of frames for the uplink and a set of frames for the downlink.

As shown in FIG. 2, the transmission of the uplink frame number i from the User Equipment (UE) is shorter than the start of the corresponding downlink frame in the corresponding UE

You have to start before.

Nemerologie

, Slots are arranged in a subframe

In an increasing order of < RTI ID = 0.0 >

Lt; / RTI > One slot

Of consecutive OFDM symbols,

Is determined according to the used program and the slot configuration. In the subframe,

Lt; RTI ID = 0.0 > OFDM < / RTI &

And is temporally aligned.

Not all terminals can transmit and receive at the same time, meaning that not all OFDM symbols of a downlink slot or an uplink slot can be used.

Table 2 &

, And Table 3 shows the number of OFDM symbols per slot for a normal CP

Represents the number of OFDM symbols per slot for an extended CP in the slot.

NR 물리 자원(NR Physical Resource)NR Physical Resource (NR Physical Resource)

An antenna port, a resource grid, a resource element, a resource block, a carrier part, and the like are associated with a physical resource in the NR system. Can be considered.

Hereinafter, the physical resources that can be considered in the NR system will be described in detail.

Firstly, with respect to the antenna port, the antenna port is defined such that the channel on which the symbols on the antenna port are carried can be deduced from the channel on which the other symbols on the same antenna port are carried. If a large-scale property of a channel on which a symbol on one antenna port is carried can be deduced from a channel on which symbols on another antenna port are carried, the two antenna ports may be quasi co-located (QC / QCL) quasi co-location relationship. Herein, the broad characteristics include at least one of a delay spread, a Doppler spread, a frequency shift, an average received power, and a received timing.

3, if the resource grid is in the frequency domain

Subcarriers, and one subframe consists of 14 x 2 ^u OFDM symbols, but is not limited thereto.

In the NR system, the transmitted signal is

One or more resource grids comprised of subcarriers and /

RTI ID = 0.0 > OFDM < / RTI > From here,

to be. remind

Represents the maximum transmission bandwidth, which may vary not only between the uplink and downlink as well as the neighbors.

In this case, as shown in Fig. 3,

And antenna port p can be set to one resource grid.

Nemerologie

And each element of the resource grid for antenna port p is referred to as a resource element,

&Lt; / RTI > From here,

Is an index in the frequency domain,

Quot; refers to the position of a symbol in a subframe. When referring to a resource element in a slot,

. From here,

to be.

Nemerologie

And the resource element for the antenna port p

Is a complex value,

. If there is no risk of confusion or if no particular antenna port or neuromolecule is specified, the indexes p and < RTI ID = 0.0 >

Can be dropped, resulting in a complex value of < RTI ID = 0.0 >

or

.

In addition, a physical resource block is a block in the frequency domain

Are defined as consecutive subcarriers. On the frequency domain,

. In this case, the physical resource block number in the frequency domain,

And resource elements

Is given by Equation (1).

Also, with respect to a carrier part, a terminal may be configured to receive or transmit using only a subset of the resource grid. At this time, a set of resource blocks set to be received or transmitted by the UE is set to 0

.

Self-contained 서브프레임 구조Self-contained subframe structure

A time division duplexing (TDD) structure considered in the NR system is a structure that processes both an uplink (UL) and a downlink (DL) in one subframe. This is to minimize the latency of data transmission in the TDD system, and the structure is referred to as a self-contained subframe structure.

FIG. 4 shows an example of a self-contained subframe structure to which the method proposed in this specification can be applied. Fig. 4 is merely for convenience of explanation and does not limit the scope of the present invention.

Referring to FIG. 4, it is assumed that one subframe is composed of 14 orthogonal frequency division multiplexing (OFDM) symbols as in legacy LTE.

In FIG. 4, an area 402 refers to a downlink control region, and an area 404 refers to an uplink control region. Further, an area other than the area 402 and the area 404 (that is, an area without a separate mark) can be used for transmission of downlink data or uplink data.

That is, the uplink control information and the downlink control information are transmitted in one self-contained subframe. On the other hand, in the case of data, uplink data or downlink data is transmitted in one self-contained subframe.

In the case of using the structure shown in FIG. 4, in one self-contained subframe, downlink transmission and uplink transmission proceed sequentially, and downlink data transmission and uplink ACK / NACK reception can be performed .

As a result, when an error occurs in data transmission, the time required until data retransmission can be reduced. This allows the delay associated with data transfer to be minimized.

In the self-contained subframe structure as shown in FIG. 4, when a base station (eNodeB, eNB, gNB) and / or a terminal (UE) shifts from a transmission mode to a reception mode A time gap is required for the process of switching from the reception mode to the transmission mode. With respect to the time gap, when uplink transmission is performed after downlink transmission in the self-contained subframe, some OFDM symbol (s) may be set as a guard period (GP).

아날로그 빔포밍(Analog beamforming)Analog beamforming

The mmW is shortened in wavelength, so that a plurality of antennas can be installed in the same area. That is, in the 30 GHz band, a total of 100 antenna elements can be installed in a 2-dimensional array of 0.5 lambda (wavelength, λ) intervals on a panel of 5 by 5 cm with a wavelength of 1 cm.

Therefore, the mmW uses a number of antenna elements to increase the beamforming (BF) gain to increase the coverage or increase the throughput.

In this case, if a TXRU (transceiver unit) is provided so that transmission power and phase can be adjusted for each antenna element, independent beamforming can be performed for each frequency resource.

However, there is a problem in that the TXRU is not effective in terms of cost in installing all of the antenna elements of 100 or more.

Therefore, a method of mapping a plurality of antenna elements to one TXRU and adjusting the direction of a beam with an analog phase shifter is considered.

This analog beamforming method has a disadvantage that it can not perform frequency selective beaming because it can make only one beam direction in all bands.

A hybrid BF with B TXRUs, which are fewer than Q antenna elements, is considered as an intermediate form of digital BF and analog BF.

In this case, although there is a difference depending on the connection method of B TXRU and Q antenna elements, the direction of the beam that can be transmitted at the same time is limited to B or less.

A New Radio (NR) system includes terminals (e.g., UEs, hereinafter referred to as UEs for convenience) that support various bandwidths (BWs).

One of the goals of the NR system is to allow a network (NW) to flexibly schedule all UEs.

Also, the configuration for CSI-RS (Channel State Information-Reference Signal) measurement needs to be flexible and efficient.

To this end, the UE may be configured to configure one or more bandwidth parts (BWPs) from the network.

In this NR system, each UE can increase the power utilization efficiency on the RF side or baseband side by setting RF (Radio Frequency) according to its active BWP size.

Here, the active BWP means the BWP activated (by the network) among the set BWPs.

In this case, according to the CSI-RS measurement configuration, the UE may retune (or reset) the RF to measure the CSI-RS.

Or, there may be processing changes depending on the implementation of the baseband.

In the following, signaling CSI-RS measurement configurations suitable for UEs processing in various BWP states proposed in the present specification, and operations that UEs can have based on signaling will be described in detail .

측정 대역폭 (measurement BW)과 Measurement bandwidth (measurement BW) and UEUE 활성 activation BWPBWP (active (active BWPBWP ) 또는 ) or UEUE 최대 대역폭(maximum BW)과의 관계 Relationship to maximum bandwidth (maximum BW)

The terms used below are briefly defined.

First, the measurement bandwidth (measurement BW) may refer to the BW for which the CSI-RS is configured.

As described above, active BWP means BWP in which activation is instructed among the BWPs set by the UE.

The UE maximum BW means the maximum BW that the UE can support.

And, a measurement gap indicates a period that the UE can use to perform the measurement. In this period, UL and DL transmissions are not scheduled.

The UE can configure the active BWP from the network (Network, NW).

Here, the network may be expressed as a base station or the like.

Also, receiving an active BWP configuration can be interpreted in the same sense as receiving activation for a specific BWP among the set BWPs.

The UE may transmit data to and receive data from the network in the active BWP, and may receive signaling related to CSI-RS measurement for other frequency ranges in the process.

The other frequency range may include an active BWP of the UE.

Next, data reception and CSI-RS measurement may be performed differently depending on the relationship between the CSI-RS measurement BW and the active BWP of the UE or the maximum BW that can be supported by the UE, and the following cases (cases 1 to 3) We will look at it more specifically.

(Case 1)(Case 1)

Case 1 is a method of performing data reception and CSI-RS measurement when the CSI-RS measurement BW and the active BWP have the same center frequency.

If the active BWP of the UE is greater than the CSI-RS measurement BW, the UE may not need an RF retuning time.

On the other hand, if the active BWP of the UE is smaller than the CSI-RS measurement BW, but the UE's maximum BW is larger than the measurement BW, the UE may require an RF transition time depending on the implementation aspect.

At this time, the RF transition time may be a maximum of 20 us.

The RF retuning time used herein is the time required for the UE to switch or reset the RF, and can be interpreted in the same meaning as the RF transition time.

In such an environment, if the active BWP and the measurement BW have the same numerology, the UE can measure the CSI-RS and receive data at the active BWP.

Alternatively, in such a case, the NW may switch the active BWP of the UE to measurement BW so that it can receive data in the measurement BW.

If the active BWP and the measurement BW have different numerology, the UE performs measurement only for the corresponding BW according to signaling of the NW, or the NW signals the active BWP of the UE to switch to the measurement BW, It is possible to perform both the performance and the data reception.

(Case 2)(Case 2)

Case 2 is a method of performing data reception and CSI-RS measurement when CSI-RS measurement BW and active BWP have different center frequencies.

If the CSI-RS measurement BW and the active BWP have different center frequencies, the UE needs to perform RF retuning.

Here, the CSI-RS measurement BW and the active BWP have different center frequencies, which means that the measurement BW deviates from the UE cover BW.

In this case, the UE can measure the CSI-RS using the measurement gap received from the NW.

However, if the CSI-RS measurement BW is included in the maximum BW of the UE but has a different center frequency from the active BWP, there is a trade-off in terms of data reception and power saving, The UE may operate.

(Case 3)(Case 3)

Case 3 is a method for performing measurement using data reception and CSI-RS when the UE has multiple RFs (multiple RFs).

If the UE has multiple RFs, the UE may operate differently in the same circumstances as case 1 or case 2 above.

If there is one active BWP, the UE can operate according to the given CSI-RS measurement BW size as follows.

(1) If the CSI-RS measurement BW can be covered using the remaining RF (s) except for the RF used for active BWP, the UE shall continue to receive data from the active BWP and use the remaining RF (s) To process the CSI-RS measurement BW.

Alternatively, the NW may activate the measurement BW to cause the UE to switch to the multiple active BWP mode.

(2) If the CSI-RS measurement BW can not cover with the remaining RF except for the RF used in the active BWP, the UE performs the same process as the case 1 or case 2 using multiple RFs can do.

측정 간격 설정과 단말 동작 (measurement gap configuration and Measurement gap configuration and measurement UEUE behaviors) behaviors)

Next, the measurement interval setting and the UE operation will be described in more detail.

Depending on the state of the UE BWP in each case described above, the NW may configure the UE with an appropriate measurement gap, and the UE may perform various operations accordingly (option 1, option 2).

옵션 1(Option 1)Option 1 (Option 1)

NW can define a measurement gap corresponding to each case (case 1, case 2, case 3).

At this time, the UE performs CSI-RS measurement using the measurement gap received from the network according to each case, and does not receive data during the measurement gap.

Option 1 has the advantage that both NW and UE can perform processing without additional signaling overhead, but it may not be effective for some UEs because the measurement gap utilization efficiency is different on the UE side.

옵션 2(Option 2)Option 2 (Option 2)

The NW can predefine the measurement gap table according to the capability of the terminal.

The NW may indicate an adaptive measurement gap to the corresponding UE according to the capability and state of the UE.

At this time, a measurement gap table may be defined by defining measurement gaps for each UE, or a measurement gap table may be formed by grouping UEs based on specific criteria and defining measurement gaps for each group.

In addition, another measurement gap can be defined according to the subcarrier spacing of the BW processed by the UE.

Option 2 has the effect of increasing UE utilization efficiency by configuring the optimal measurement gap for each UE.

옵션 3(Option 3)Option 3 (Option 3)

If there is no indication of the NW, the UE may perform the CSI-RS measurement according to its capability without a measurement gap or considering a predetermined time delay.

For example, if the NW signals the UE to the CSI-RS measurement configuration while the UE knows the capability of the UE, if the timing for preparing the process does not affect other processes, You can proceed without gap signaling.

Alternatively, if the timing of preparing the processing according to the CSI-RS measurement configuration affects other processes but the UE does not have the measurement gap signaling of the NW, the UE can perform the corresponding processing and then perform the normal data / control processing.

Here, since the capability of the UE is known on the NW side, the time delay due to the CSI-RS measurement can be known.

Next, a method of performing measurement based on the CSI-RS proposed in the present specification will be described in more detail with reference to the related drawings (FIGS. 5 and 6).

First, the terminal transmits a capability information element (IE) including information on a measurement gap supported by the terminal to the network (S510).

Then, the terminal receives from the network information on a starting position at which the measurement is performed on a measurement bandwidth (measurement BW) (S520).

The measurement bandwidth refers to a bandwidth at which the CSI-RS is set.

The measurement gap may be determined according to a subcarrier spacing.

If the active bandwidth part and the measurement bandwidth BW are set differently, the terminal may transmit the CSI-RS (BW) on the measurement bandwidth (measurement BW) during the measurement gap from the start position. (Step S530).

Here, when the active bandwidth part and the measured bandwidth are set differently, it may mean that the measured bandwidth is not included in the maximum bandwidth supported by the terminal, and the center frequency of the active bandwidth part and the measured bandwidth are different from each other.

Additionally, the terminal may retune the radio frequency (RF) from the active bandwidth part to the measurement bandwidth before step S530.

If the terminal has a plurality of RFs, the following steps can be additionally performed.

That is, the terminal may receive data from the network on the active bandwidth part in addition to steps S510 to S530.

In this case, the data is received based on a first RF of the terminal, and the measurement can be performed based on a second RF of the terminal.

In the prior art, the same measurement gap is set regardless of the terminal performance in the network. However, the measurement performed based on the CSI-RS proposed in the present specification uses a measurement gap according to the performance of the terminal, It is effective.

본 발명이 적용될 수 있는 장치 일반Apparatus to which the present invention may be applied

Referring to FIG. 6, a wireless communication system includes a plurality of terminals 620 located within a region of a base station 610 and a base station 610.

The BS and the MS may be represented by wireless devices, respectively.

The base station 610 includes a processor 611, a memory 612, and a radio frequency module 613.

The processor 611 implements the functions, processes and / or methods suggested in Figs. 1-5 above. The layers of the air interface protocol may be implemented by a processor. The memory 612 is coupled to the processor and stores various information for driving the processor. The RF module 613 is coupled to the processor to transmit and / or receive wireless signals.

The terminal 620 includes a processor 621, a memory 622, and an RF module 623.

The processor 621 implements the functions, processes and / or methods suggested in Figs. 1-5 above. The layers of the air interface protocol may be implemented by a processor. The memory 622 is coupled to the processor and stores various information for driving the processor. The RF module 623 is coupled to the processor to transmit and / or receive wireless signals.

The

memories

612 and 622 may be internal or external to the

processors

611 and 621 and may be coupled to the

processors

611 and 621 by various well known means.

Also, the base station 610 and / or the terminal 620 may have a single antenna or multiple antennas.

Particularly, FIG. 7 illustrates the terminal of FIG. 6 in more detail.

7, a terminal includes a processor (or a digital signal processor (DSP) 710, an RF module (or RF unit) 735, a power management module 705 An antenna 740, a battery 755, a display 715, a keypad 720, a memory 730, a SIM (Subscriber Identification Module ) card 725 (this configuration is optional), a speaker 745 and a microphone 750. The terminal may also include a single antenna or multiple antennas .

Processor 710 implements the functions, processes and / or methods suggested in FIGS. 1-6 above. The layer of the air interface protocol may be implemented by a processor.

Memory 730 is coupled to the processor and stores information related to the operation of the processor. The memory may be internal or external to the processor and may be coupled to the processor by any of a variety of well known means.

The user inputs command information such as a telephone number or the like by, for example, pressing (or touching) a button on the keypad 720 or voice activation using the microphone 750. The processor receives such command information and processes it to perform appropriate functions, such as dialing a telephone number. Operational data may be extracted from the sim card 725 or memory. The processor may also display command information or drive information on the display 715 for the user to perceive and for convenience.

The RF module 735 is coupled to the processor to transmit and / or receive RF signals. The processor communicates command information to the RF module to transmit, for example, a radio signal that constitutes voice communication data, to initiate communication. The RF module consists of a receiver and a transmitter for receiving and transmitting radio signals. The antenna 740 functions to transmit and receive radio signals. When receiving a radio signal, the RF module can transmit the signal for processing by the processor and convert the signal to baseband. The processed signal can be converted to audible or readable information output via the speaker 745.

Specifically, FIG. 8 shows an example of an RF module that can be implemented in an FDD (Frequency Division Duplex) system.

First, in the transmission path, the processor described in FIGS. 6 and 7 processes the data to be transmitted and provides an analog output signal to the transmitter 810.

Within the transmitter 810, the analog output signal is filtered by a low pass filter (LPF) 811 to remove images caused by a digital-to-analog conversion (ADC) And amplified by a Variable Gain Amplifier (VGA) 813. The amplified signal is filtered by a filter 814 and amplified by a power amplifier (PA) 815 and is routed through the duplexer (s) 850 / antenna switch (s) 860 and transmitted via the antenna 870.

In addition, in the receive path, antenna 870 receives signals from the outside and provides received signals that are routed through antenna switch (s) 860 / duplexers 850, .

Within the receiver 820, the received signals are amplified by a Low Noise Amplifier (LNA) 823, filtered by a bandpass filter 824, and filtered by a down converter (Mixer) 825 And downconverted to the baseband.

The down-converted signal is filtered by a low pass filter (LPF) 826 and amplified by VGA 827 to obtain an analog input signal, which is provided to the processor described in FIGS.

A local oscillator (LO) generator 840 also generates and provides transmit and receive LO signals to up-converter 812 and down-converter 825, respectively.

In addition, a phase locked loop (PLL) 830 receives control information from the processor to generate transmit and receive LO signals at appropriate frequencies and provides control signals to the LO generator 840.

Further, the circuits shown in Fig. 8 may be arranged differently from the configuration shown in Fig.

Specifically, FIG. 9 shows an example of an RF module that can be implemented in a TDD (Time Division Duplex) system.

The transmitter 910 and receiver 920 of the RF module in the TDD system are identical in structure to the transmitter and receiver of the RF module in the FDD system.

Hereinafter, only the structure of the RF module of the TDD system that differs from the RF module of the FDD system will be described, and the same structure will be described with reference to FIG.

The signal amplified by the power amplifier (PA) 915 of the transmitter is routed through a Band Select Switch 950, a band pass filter (BPF) 960 and an antenna switch (s) And transmitted via the antenna 980. [

In addition, in the receive path, antenna 980 receives signals from the outside and provides received signals that are coupled to antenna switch (s) 970, band pass filter 960, and band select switch 950 And is provided to the receiver 920. [

The embodiments described above are those in which the elements and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

Embodiments in accordance with the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) field programmable gate arrays, processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, a procedure, a function, or the like which performs the functions or operations described above. The software code can be stored in memory and driven by the processor. The memory is located inside or outside the processor and can exchange data with the processor by various means already known.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the essential characteristics thereof. Accordingly, the foregoing detailed description is to be considered in all respects illustrative and not restrictive. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Although the method for performing measurement in the wireless communication system of the present invention has been described with reference to the example applied to the 3GPP LTE / LTE-A system and the 5G system (New RAT system), the present invention is applicable to various wireless communication systems It is possible.

Claims

A method of performing a measurement based on a CSI-RS (Channel State Information-Reference Signal) in a wireless communication system,

Transmitting a capability information element (IE) including information on a measurement gap supported by the terminal to a network;

Receiving from the network information about a starting position for performing the measurement on a measurement bandwidth (measurement BW); And

A measurement based on the CSI-RS on the measurement bandwidth (measurement BW) during the measurement gap from the start position, when the active bandwidth part and the measurement bandwidth (measurement BW) are set differently < / RTI > wherein the method comprises performing a measurement.
The method according to claim 1,

Further comprising retuning a radio frequency (RF) from the active bandwidth part to the measured bandwidth.
The method according to claim 1,

Wherein the measured bandwidth is a bandwidth at which the CSI-RS is set.
The method according to claim 1,

Wherein if the active bandwidth part and the measured bandwidth are set differently, the measured bandwidth is not included in the maximum bandwidth supported by the terminal, and the center frequency of the active bandwidth part and the measured bandwidth are different.
The method according to claim 1,

Wherein the measurement gap is determined according to a subcarrier spacing.
The method according to claim 1,

Further comprising receiving data from the network on the active bandwidth part.
The method according to claim 6,

Wherein the data is received based on a first RF of the terminal,

Wherein the measurement is performed based on a second RF of the terminal.
A terminal for performing a measurement based on a CSI-RS (Channel State Information-Reference Signal) in a wireless communication system,

An RF (Radio Frequency) module for transmitting and receiving a radio signal; And

And a processor operatively coupled to the RF module,

Transmitting a capability information element (IE) including information on a measurement gap supported by the terminal to a network;

From the network, information about a starting position for performing the measurement on a measurement bandwidth (measurement BW); And

A measurement based on the CSI-RS on the measurement bandwidth (measurement BW) during the measurement gap from the start position, when the active bandwidth part and the measurement bandwidth (measurement BW) are set differently wherein the terminal is configured to perform a measurement.
9. The apparatus of claim 8,

And to retune the radio frequency (RF) from the active bandwidth part to the measured bandwidth.
9. The apparatus of claim 8,

And to receive data from the network on the active bandwidth part.
11. The method of claim 10,

Wherein the data is received based on a first RF of the terminal,

Wherein the measurement is performed based on a second RF of the terminal.