KR20210083652A - Methd and apparatus of requesting a measurement gap in a next generation mobile communication system - Google Patents

Abstract

The present disclosure relates to a communication technique which converges a 5G communication system for supporting a higher data transmission rate than a 4G system with IoT technology, and a system thereof. The present disclosure can be applied to intelligent services (for example, a smart home, a smart building, a smart city, a smart car or connected car, healthcare, digital education, retail business, security and safety-related services, etc.) based on 5G communication technology and IoT-related technology. The present disclosure discloses a method for a terminal to request, set and update a measurement gap in a mobile communication system, and an apparatus therefor. Provided is a control signal processing method which includes the steps of: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the processing to the base station.

Description

Method and apparatus for requesting a measurement gap in a next-generation mobile communication system {METHD AND APPARATUS OF REQUESTING A MEASUREMENT GAP IN A NEXT GENERATION MOBILE COMMUNICATION SYSTEM}

The present invention relates to a method and apparatus for using a measurement gap in a mobile communication system. In addition, the present invention relates to a method and apparatus for requesting a measurement gap by a terminal in a mobile communication system.

Efforts are being made to develop an improved 5G communication system or pre-5G communication system in order to meet the increasing demand for wireless data traffic after the commercialization of the 4G communication system. For this reason, the 5G communication system or the pre-5G communication system is called a 4G network after (Beyond 4G Network) communication system or an LTE system after (Post LTE) system. In order to achieve a high data rate, the 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band). In order to mitigate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-high frequency band, in the 5G communication system, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used. ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, for network improvement of the system, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud RAN), and an ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Technology development is underway. In addition, in the 5G system, FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), which are advanced coding modulation (ACM) methods, and FBMC (Filter Bank Multi Carrier), which are advanced access technologies, NOMA (non orthogonal multiple access), and sparse code multiple access (SCMA) are being developed.

On the other hand, the Internet is evolving from a human-centered connection network where humans create and consume information to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. Internet of Everything (IoE) technology, which combines big data processing technology through connection with cloud servers, etc. with IoT technology, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between objects and a machine to machine communication (Machine to Machine) are required. , M2M), and MTC (Machine Type Communication) are being studied. In the IoT environment, an intelligent IT (Internet Technology) service that collects and analyzes data generated from connected objects and creates new values in human life can be provided. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, advanced medical service, etc. through the convergence and complex between existing IT (information technology) technology and various industries. can be applied to

Accordingly, various attempts are being made to apply the 5G communication system to the IoT network. For example, technologies such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication) are implemented by 5G communication technologies such as beamforming, MIMO, and array antenna. will be. The application of a cloud radio access network (cloud RAN) as the big data processing technology described above is an example of the convergence of 5G technology and IoT technology.

An object of the present invention is to provide a method and an apparatus for using a measurement gap in a mobile communication system. Another object of the present invention is to provide a method and apparatus for requesting a measurement gap by a terminal in a mobile communication system, and a method and apparatus for operating a network device related thereto.

The present invention for solving the above problems is a control signal processing method in a wireless communication system, the method comprising: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the processing to the base station.

According to various embodiments of the present disclosure, a method and apparatus for using a measurement gap in a mobile communication system may be provided. Also, according to various embodiments of the present disclosure, it is possible to provide a method and apparatus for a terminal requesting a measurement gap in a mobile communication system, and a method and apparatus for operating a related network device.

In addition, according to various embodiments of the present invention, as the terminal dynamically requests a measurement gap in the next-generation mobile communication system, the base station may update the configuration information by considering the optimal measurement gap according to the configuration information applied to the terminal. have.

1A is a diagram illustrating the structure of an LTE system to be referred to for the description of the present invention.
1B is a diagram illustrating a radio protocol structure in an LTE system to be referred to for the description of the present invention.
1C is a diagram showing the structure of a next-generation mobile communication system to which the present invention is applied.
1D is a diagram illustrating a radio protocol structure of a next-generation mobile communication system to which the present invention can be applied.
FIG. 1E is a diagram illustrating a scenario in which a measurement gap necessary for a UE to measure a reference signal from neighboring cells is applied in a next-generation mobile communication system to which the present invention is applied, and actual measurement is performed.
FIG. 1F is a diagram illustrating an overall operation in which the UE dynamically transmits measurement gap request information through an RRCReconfigurationComplete message and the base station updates the measurement gap information by reflecting the same according to Embodiment 1 to which the present invention is applied.
FIG. 1G is a diagram illustrating an overall operation in which the terminal dynamically transmits measurement gap request information through a specific RRC message and the base station updates the measurement gap information by reflecting the measurement gap information according to Embodiment 2 to which the present invention is applied.
1H is a third embodiment to which the present invention is applied, in which the terminal dynamically transmits measurement gap request information through a MAC (medium access control) CE (control element) and the base station reflects it and updates the measurement gap information. is a diagram showing
FIG. 1I is a diagram showing the overall operation of a terminal applied to various embodiments of the present invention, applied to Embodiments 1, 2, and 3, and dividing the drawings for each embodiment into FIGS. 1iA, 1iB, and 1iC Explain.
1J is a diagram illustrating an operation of a base station applied to various embodiments of the present invention.
1K is a block diagram showing the configuration of a terminal to which the present invention is applied.
11 is a block diagram showing the configuration of a base station according to the present invention.

The operating principle of the present invention will be described in detail below with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of a related well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification. A term for identifying an access node used in the following description, a term referring to network entities, a term referring to messages, a term referring to an interface between network objects, and a term referring to various identification information and the like are exemplified for convenience of description. Therefore, the present invention is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

For convenience of description below, the present invention uses terms and names defined in the 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) standard, or terms and names modified based thereon. However, the present invention is not limited by the above terms and names, and may be equally applied to systems conforming to other standards. That is, as a system to which the present invention is applied, the entire mobile communication system, particularly the LTE system, and the NR system as a whole may be applied.

In various embodiments of the present invention, when a terminal performs measurement on a neighboring cell in a next-generation mobile communication system, the need for a measurement gap is transmitted to the base station to provide a different radio access technology (RAT) type and a different frequency band. , various operations for setting and updating a measurement gap that can measure other cells in the same frequency band are described. Although the current NR (new radio) system provides the UE with a measurement gap by default, the measurement gap set in this way cannot be dynamically updated according to the request of the UE, and an optimal measurement gap cannot be set as it is fixedly applied. Therefore, various embodiments of the present invention will be described below for various methods for solving this problem.

1A is a diagram illustrating the structure of an LTE system to be referred to for the description of the present invention.

Referring to FIG. 1A, as shown, the radio access network of the LTE system includes a next-generation base station (Evolved Node B, hereinafter eNB, Node B or base station) (1a-05, 1a-10, 1a-15, 1a-20) and It consists of a Mobility Management Entity (MME, 1a-25) and a Serving-Gateway (S-GW, 1a-30). A user equipment (User Equipment, hereinafter, UE or terminal) 1a-35 accesses an external network through the eNBs 1a-05 to 1a-20 and the S-GW 1a-30.

In FIG. 1A , eNBs 1a-05, 1a-10, 1a-15, and 1a-20 correspond to the existing Node B of the UMTS system. The eNB 1a-05 is connected to the UE 1a-35 through a radio channel and performs a more complex role than the existing Node B. In the LTE system, all user traffic, including real-time services such as VoIP (Voice over IP) through the Internet protocol, are serviced through a shared channel, so the state information such as buffer status of UEs, available transmission power status, and channel status A device that aggregates and performs scheduling is required, and the eNBs 1a-05, 1a-10, 1a-15, and 1a-20 are responsible for this. One eNB typically controls multiple cells. For example, in order to implement a transmission rate of 100 Mbps, the LTE system uses, for example, orthogonal frequency division multiplexing (OFDM) in a 20 MHz bandwidth as a radio access technology. In addition, an Adaptive Modulation & Coding (AMC) scheme that determines a modulation scheme and a channel coding rate according to the channel state of the terminal is applied. The S-GW (1a-30) is a device that provides a data bearer, and creates or removes a data bearer under the control of the MME (1a-25). The MME (1a-25) is a device in charge of various control functions as well as a mobility management function for the terminal, and is connected to a plurality of base stations.

1B is a diagram illustrating a radio protocol structure in an LTE system to be referred to for the description of the present invention.

Referring to Figure 1b, the radio protocol of the LTE system is PDCP (Packet Data Convergence Protocol 1b-05, 1b-40), RLC (Radio Link Control 1b-10, 1b-35), MAC (Medium Access) in the UE and the eNB, respectively. Control 1b-15, 1b-30). The PDCPs 1b-05 and 1b-40 are in charge of IP header compression/restore operations. The main functions of PDCP (1b-05, 1b-40) are summarized below.

- Header compression and decompression (ROHC only)

- Transfer of user data

- In-sequence delivery of upper layer PDUs at PDCP re-establishment procedure for RLC AM

- Order reordering function (For split bearers in DC (only support for RLC AM): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

- Duplicate detection of lower layer SDUs at PDCP re-establishment procedure for RLC AM)

- Retransmission function (Retransmission of PDCP SDUs at handover and, for split bearers in DC, of PDCP PDUs at PDCP data-recovery procedure, for RLC AM)

- Encryption and decryption function (Ciphering and deciphering)

- Timer-based SDU discard in uplink.

The radio link control (Radio Link Control, hereinafter referred to as RLC) 1b-10 and 1b-35 reconfigures a PDCP packet data unit (PDU) to an appropriate size to perform ARQ operation and the like. The main functions of RLCs (1b-10, 1b-35) are summarized below.

- Data transfer function (Transfer of upper layer PDUs)

- ARQ function (Error Correction through ARQ (only for AM data transfer))

- Concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data transfer)

- Re-segmentation of RLC data PDUs (only for AM data transfer)

- Reordering of RLC data PDUs (only for UM and AM data transfer)

- Duplicate detection (only for UM and AM data transfer)

- Protocol error detection (only for AM data transfer)

- RLC SDU discard function (RLC SDU discard (only for UM and AM data transfer))

- RLC re-establishment function (RLC re-establishment)

The MACs 1b-15 and 1b-30 are connected to several RLC layer devices configured in one terminal, and perform operations of multiplexing RLC PDUs into MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The main functions of MACs 1b-15, 1b-30 are summarized as follows.

- Mapping function (Mapping between logical channels and transport channels)

- Multiplexing/demultiplexing of MAC SDUs belonging to one or different logical channels into/from transport blocks (TB) delivered to/from the physical layer on transport channels)

- Scheduling information reporting function (Scheduling information reporting)

- HARQ function (Error correction through HARQ)

- Priority handling between logical channels of one UE

- Priority handling between UEs by means of dynamic scheduling

- MBMS service identification

- Transport format selection

- Padding function

The physical layer (1b-20, 1b-25) channel-codes and modulates upper layer data, creates OFDM symbols and transmits them over a radio channel, or demodulates and channel-decodes OFDM symbols received through the radio channel and transmits them to higher layers do the action

1C is a diagram showing the structure of a next-generation mobile communication system to which the present invention is applied.

Referring to FIG. 1C, as shown, the radio access network of the next-generation mobile communication system includes a next-generation base station (New Radio Node B, hereinafter NR NB, 1c-10) and a New Radio Core Network (NR CN, or NG CN: Next Generation). Core Network, 1c-05). A user terminal (New Radio User Equipment, hereinafter NR UE or terminal, 1c-15) accesses an external network through NR NB 1c-10 and NR CN 1c-05.

In FIG. 1c , NR NBs 1c-10 correspond to an Evolved Node B (eNB) of an existing LTE system. The NR NB is connected to the NR UE 1c-15 through a radio channel and can provide a service superior to that of the existing Node B. In the next-generation mobile communication system, since all user traffic is serviced through a shared channel, a device for scheduling by collecting status information such as buffer status, available transmission power status, and channel status of UEs is required. (1c-10) is in charge. One NR NB typically controls multiple cells. In order to implement ultra-high-speed data transmission compared to the existing LTE, it can have more than the existing maximum bandwidth, and additionally beamforming technology can be grafted by using Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) as a radio access technology. . In addition, an Adaptive Modulation & Coding (AMC) scheme that determines a modulation scheme and a channel coding rate according to the channel state of the terminal is applied. The NR CN (1c-05) performs functions such as mobility support, bearer setup, QoS setup, and the like. The NR CN (1c-05) is a device in charge of various control functions as well as a mobility management function for the terminal, and is connected to a plurality of base stations. In addition, the next-generation mobile communication system can be linked with the existing LTE system, and the NR CN (1c-05) is connected to the MME (1c-25) through a network interface. The MME (1c-25) is connected to the existing base station eNB (1c-30).

1D is a diagram illustrating a radio protocol structure of a next-generation mobile communication system to which the present invention can be applied.

Referring to FIG. 1D , the radio protocol of the next-generation mobile communication system is NR SDAP (1d-01, 1d-45), NR PDCP (1d-05, 1d-40), and NR RLC (1d-10) in the terminal and the NR base station, respectively. , 1d-35), and NR MAC (1d-15, 1d-30).

The main functions of the NR SDAPs 1d-01 and 1d-45 may include some of the following functions.

- Transfer of user plane data

- Mapping between a QoS flow and a DRB for both DL and UL for uplink and downlink

- Marking QoS flow ID in both DL and UL packets for uplink and downlink

- A function of mapping a relective QoS flow to a data bearer for uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

With respect to the SDAP layer device, the UE can receive a configuration of whether to use the header of the SDAP layer device or the function of the SDAP layer device for each PDCP layer device, for each bearer, or for each logical channel with an RRC message, and the SDAP header If is set, the UE uses the uplink and downlink QoS flow and data bearer mapping information with the NAS QoS reflection setting 1-bit indicator (NAS reflective QoS) and the AS QoS reflection setting 1-bit indicator (AS reflective QoS) of the SDAP header. can be instructed to update or reset . The SDAP header may include QoS flow ID information indicating QoS. The QoS information may be used as data processing priority and scheduling information to support a smooth service.

The main function of NR PDCP (1d-05, 1d-40) may include some of the following functions.

- Header compression and decompression (ROHC only)

- Transfer of user data

- In-sequence delivery of upper layer PDUs

- Out-of-sequence delivery of upper layer PDUs

- Order reordering function (PDCP PDU reordering for reception)

- Duplicate detection of lower layer SDUs

- Retransmission of PDCP SDUs

- Encryption and decryption function (Ciphering and deciphering)

- Timer-based SDU discard in uplink.

In the above, the reordering function of the NR PDCP device refers to a function of reordering PDCP PDUs received from a lower layer in order based on a PDCP sequence number (SN), and a function of delivering data to a higher layer in the reordered order. may include, or may include a function of directly delivering without considering the order, may include a function of reordering the order to record the lost PDCP PDUs, and report the status of the lost PDCP PDUs It may include a function for the transmitting side, and may include a function for requesting retransmission for lost PDCP PDUs.

The main function of the NR RLC (1d-10, 1d-35) may include some of the following functions.

- Data transfer function (Transfer of upper layer PDUs)

- In-sequence delivery of upper layer PDUs

- Out-of-sequence delivery of upper layer PDUs

- ARQ function (Error Correction through ARQ)

- Concatenation, segmentation and reassembly of RLC SDUs

- Re-segmentation of RLC data PDUs

- Reordering of RLC data PDUs

- Duplicate detection

- Protocol error detection

- RLC SDU discard function (RLC SDU discard)

- RLC re-establishment function (RLC re-establishment)

In the above description, the in-sequence delivery function of the NR RLC device refers to a function of sequentially delivering RLC SDUs received from a lower layer to an upper layer, and an original RLC SDU is divided into several RLC SDUs and received. , it may include a function of reassembling it and delivering it, and may include a function of rearranging the received RLC PDUs based on an RLC sequence number (SN) or PDCP SN (sequence number), and rearranging the order It may include a function of recording the lost RLC PDUs, a function of reporting a status on the lost RLC PDUs to the transmitting side, and a function of requesting retransmission of the lost RLC PDUs. and, if there is a lost RLC SDU, it may include a function of sequentially delivering only RLC SDUs before the lost RLC SDU to the upper layer, or if a predetermined timer expires even if there is a lost RLC SDU, the timer It may include a function of sequentially delivering all RLC SDUs received before the start of RLC to the upper layer, or if a predetermined timer expires even if there are lost RLC SDUs, all RLC SDUs received so far are sequentially transferred to the upper layer. It may include a function to transmit. In addition, the RLC PDUs may be processed in the order in which they are received (in the order of arrival regardless of the sequence number and sequence number) and delivered to the PDCP device out of sequence (out-of sequence delivery). Segments stored in the buffer or to be received later are received, reconstructed into one complete RLC PDU, processed and delivered to the PDCP device. The NR RLC layer may not include a concatenation function, and the function may be performed in the NR MAC layer or replaced with a multiplexing function of the NR MAC layer.

In the above, the out-of-sequence delivery function of the NR RLC device refers to a function of directly delivering RLC SDUs received from a lower layer to a higher layer regardless of order, and one RLC SDU originally has several RLCs. When received after being divided into SDUs, it may include a function of reassembling and delivering it, and may include a function of storing the RLC SN or PDCP SN of the received RLC PDUs, arranging the order, and recording the lost RLC PDUs. can

The NR MACs 1d-15 and 1d-30 may be connected to several NR RLC layer devices configured in one UE, and the main function of the NR MAC may include some of the following functions.

- Mapping function (Mapping between logical channels and transport channels)

- Multiplexing/demultiplexing of MAC SDUs

- Scheduling information reporting function (Scheduling information reporting)

- HARQ function (Error correction through HARQ)

- Priority handling between logical channels of one UE

- Priority handling between UEs by means of dynamic scheduling

- MBMS service identification

- Transport format selection

- Padding function

The NR PHY layer (1d-20, 1d-25) channel-codes and modulates the upper layer data, creates an OFDM symbol and transmits it to the radio channel, or demodulates and channel-decodes the OFDM symbol received through the radio channel to the upper layer. You can perform a forwarding action.

FIG. 1E is a diagram illustrating a scenario in which a measurement gap necessary for a UE to measure a reference signal from neighboring cells is applied in a next-generation mobile communication system to which the present invention is applied, and actual measurement is performed.

In the existing NR system, a measurement gap must always be set, especially since (E-UTRA NR - dual connectivity) measurement for different RAT types is essential in the EN-DC system. In particular, in the Rel-15 NR system, the measurement gap is always transmitted for the following situations.

- Inter-RAT measurement for NR when operating in LTE alone mode (NR Inter-RAT measurement in LTE SA)

- Inter-RAT measurement or inter frequency measurement for NR when operating with EN-DC (NR Inter-RAT or Inter-Freq. measurement in (NG)EN-DC)

- NR Inter-Freq. measurement in NR SA when operating in NR single mode

- NR-DC or NR E-UTRA - NR Inter-Freq. measurement in NR-DC, and NE-DC when operating with dual connectivity (NE-DC)

- LTE inter-RAT measurement when operating in NR alone mode (LTE Inter-RAT. measurement in NR SA)

- LTE Inter-Freq. measurement in (NG)EN-DC when operating as EN-DC

- LTE inter-RAT or Inter-Freq. measurement in NR-DC and NE-DC when operating in NR-DC or NE-DC

In the above, inter-RAT measurement means measurement for different RAT types, and inter-frequency measurement means measurement between different frequencies.

In addition, in the LTE system, one measurement gap is signaled to the terminal per UE (per UE), and precisely by setting a 1-bit indicator (NeedForGap) for each band in the band combination supported by the UE. , indicating that a measurement gap is required for measurement of a band of a specific band combination. LTE signaling reference below (TS 36.331)

InterFreqBandList ::= SEQUENCE (SIZE (1..maxBands)) OF InterFreqBandInfo

InterFreqBandInfo ::= SEQUENCE {

interFreqNeedForGaps BOOLEAN

}

InterRAT-BandList ::= SEQUENCE (SIZE (1..maxBands)) OF InterRAT-BandInfo

InterRAT-BandInfo ::= SEQUENCE {

interRAT-NeedForGaps BOOLEAN

}

For example, if the terminal supports a specific band combination consisting of n bands, and n NeedForGap is required for each band, that is, if a measurement gap is required to measure each n bands, the terminal has UE capability Information is transmitted by setting n NeedForGap bits to 1 for each band. The base station receiving this may set a measurement gap for the corresponding band to the terminal.

In the NR system, unlike the LTE system, there are three types of measurement gaps of the UE. Each is a measurement gap per UE (measurement gap per UE, gapUE), a measurement gap for FR1 (measurement gap per FR1, gapFR1), and a measurement gap for FR2 (measurement gap per FR2, gapFR2). Each measurement gap is set by a gap offset (gapOffset), a gap repetition period (mgrp), a gap correction value (mgta), a gap length (mgl), and the like. See ASN.1 below.

MeasGapConfig ::= SEQUENCE {

gapFR2 SetupRelease { GapConfig } OPTIONAL, -- Need M

...,

[[

gapFR1 SetupRelease { GapConfig } OPTIONAL, -- Need M

gapUE SetupRelease { GapConfig } OPTIONAL -- Need M

]]

}

GapConfig ::= SEQUENCE {

gapOffset INTEGER (0..159),

mgl ENUMERATED {ms1dot5, ms3, ms3dot5, ms4, ms5dot5, ms6},

mgrp ENUMERATED {ms20, ms40, ms80, ms160},

mgta ENUMERATED {ms0, ms0dot25, ms0dot5},

...,

[[

refServCellIndicator ENUMERATED {pCell, pSCell, mcg-FR2} OPTIONAL -- Cond NEDCorNRDC

]]

}

For reference, there are also 24 types of gap patterns that can be set in the terminal, and they are classified according to the measurement gap length and the repetition period of the measurement gap. See table below

In addition, a gap pattern to be applied according to how the serving cell of the UE is configured in the NR system is defined. First, the gap pattern in the EN-DC situation follows the table below.

The terminal operating in the NR-only mode follows the table below.

The above two tables map the actual gap pattern to which the measurement gap for each terminal or the gap for each FR1/2 is applied.

In FIG. 1E, a scenario in which the measurement gap in the above-described NR system is actually applied will be described with an example. The terminal 1e-15 connected to the base station 1 (1e-05) of a specific RAT type performs data transmission/reception and control message transmission/reception (1e-20), and simultaneously downlinks from the neighboring base stations and cells 1e-10. A downlink reference signal (DL RS) is measured. The neighboring base station and cell may be of the same RAT type as the cell to which the UE is currently connected, and in this case, may be a cell of the same frequency band or a cell belonging to a different frequency band. Alternatively, the neighboring base station and cell may be of a different RAT type than the cell to which the terminal is currently connected. As an example, the currently connected cell may be LTE, the cell to be measured may be NR, and conversely, the connected cell may be NR, and the cell to be measured may be LTE.

When explaining the example shown in FIG. 1e, there is a situation in which the terminal 1e-15 needs to perform reference signal measurement from the neighboring NR cell 1e-25 in a state in which the terminal 1e-15 is connected to the LTE cell 1e-05. . Since the reference signal transmission period and offset transmitted by each NR cell are different, the base station must set an appropriate measurement gap to the terminal. Consider the following situation.

- NR frequency 1: SS/PBCH block is measured, the period is 160 ms and the offset is a ms

- NR frequency 2: SS/PBCH block is measured with a period of 80 ms and an offset of b ms

- NR frequency 3: CSI-RS (channel state information - reference signal) is measured, the period is 40 ms, the offset is c ms

- NR frequency 4: CSI-RS is measured with a period of 40 ms and an offset of d ms

The base station should set an appropriate measurement gap so that the terminal can measure the reference signal transmitted at the above four NR frequencies. As in FIG. 1e, a measurement gap (or FR1 measurement gap) (1e-85, 1e-90) for each terminal capable of simultaneously performing measurement on NR frequency 1/2/3 (1e-85, 1e-90) is transferred and measurement is performed on NR frequency 4 FR2 measurement gap (1e-100) can be set. The detailed measurement gap setting method and parameters have been described above. In the NR system, a measurement gap is essential for measurement of the surrounding RAT and frequency, and this is fixed to the terminal through information sharing such as the measurement gap between the base station and the network and the transmission location of the reference signal.

However, basically, since the measurement gap can be dynamically changed according to the type of measurement target, in the following embodiments of the present invention, the terminal requests whether the measurement gap is necessary and detailed settings, and the base station reflects it and dynamically changes the measurement gap Consider how you can set

FIG. 1f is a diagram illustrating an overall operation in which the UE dynamically transmits measurement gap request information through the RRCReconfigurationComplete message and the base station updates the measurement gap information by reflecting the same as Embodiment 1 to which the present invention is applied. In particular, in the embodiment of FIG. 1f, after the terminal applies the configuration to the RRCReconfiguration message set by the base station, it is determined that the measurement gap needs to be changed, and the method of delivering auxiliary information necessary for updating and reconfiguring the measurement gap in the RRCReconfigurationComplete message will be described. . In addition, in this embodiment, each of the following three scenarios will be described.

1. CA (carrier aggregation) configuration (1f-15~1f-20): When the RRCReconfiguration message includes the cell group configuration (CellGroupConfig), especially the addition/change and removal information for a specific cell.

2. Measurement configuration (1f-25~1f-30): RRCReconfiguration message includes measurement configuration (MeasConfig), and in particular includes add/change and remove information for a specific measurement object (Measurement Object, MO), and if there is.

3. Handover configuration (1f-45~1f-40): RRCReconfiguration message includes cell group configuration (CellGroupConfig), and in particular, configuration information related to handover and PSCell (primary secondary cell) change in ReconfigurationWithSync configuration information if it contains .

The base station 1f-02 corresponding to the serving base station and the terminal 1f-01 in a connected state receive a request for a terminal capability report from the base station 1f-02 through the UECapabilityEnquiry message in step 1f-05, and in response to this, 1f In step -10, the UECapabilityInformation message is delivered to the base station 1f-02 by receiving its own terminal capability information. In particular, the corresponding terminal capability information message may include capability information of a terminal that dynamically requests a measurement gap and applies a setting. This may be transmitted as 1 bit for each terminal, or 1 bit may be transmitted for each specific band for each band combination. The base station 1f-02, which has confirmed the terminal information, can determine that the corresponding terminal 1f-01 can dynamically request a measurement gap and perform dynamic measurement gap setting accordingly, and perform an operation according to each scenario. different

Looking at the CA setting situation of Scenario 1, the base station 1f-02 may configure a plurality of serving cell carriers to the corresponding UE 1f-01 to perform CA operation. In this case, configuration information for specific serving cells may be transmitted in step 1f-15. The configuration information may be delivered through an RRCReconfiguration message. That is, SCell Addition and Release settings may be delivered, and the corresponding SCell settings may include configuration information necessary for operation in each serving cell. The terminal 1f-01 receiving this may change the physical performance of the terminal 1f-01 by applying the configuration for the cell configured according to the CA configuration. For example, the RF performance of the terminal 1f-01, that is, the number of transmit/receive antennas and transmit power may change, and accordingly, the measurement performance of neighboring cells may also be changed. In step 1f-20, the terminal 1f-01 may or may not need a request for a measurement gap for a specific frequency according to a change in measurement performance, and may transmit this information to the base station. For example, the terminal 1f-01 may dynamically transmit information on whether a measurement gap for a specific frequency is required according to a change in measurement performance to the base station 1f-02 in an RRCReconfigurationComplete message. Corresponding information is auxiliary information required to set and update a measurement gap, and is defined as gap setup auxiliary information (GapAssistanceInfo) in various embodiments of the present invention, but this is for convenience of description and auxiliary information required to set and update a measurement gap The terminology of information is not limited thereto. This may be a 1-bit indicator indicating a request for and release of a measurement gap, such as NeedForGap in LTE, or information including generalized gap pattern information (gap period, gap length, gap offset, etc.). The detailed gap setting assistance information (GapAssistanceInfo) content and application method will be described in detail below.

Looking at the measurement setup situation of scenario 2, the base station 1f-02 transmits a plurality of MOs and measurement setup information to the corresponding terminal 1f-01 so that the terminal can smoothly measure the neighboring cells (RAT/frequency). let it be In this case, in step 1f-25, configuration information for a specific MO may be transmitted through an RRCReconfiguration message. MO can be set for each frequency, and unlike the previous setting, when a new MO is added or removed, it means that frequency information of a measurement object to be measured by the terminal 1f-01 is added or removed. This directly affects the measured RAT and frequency of the terminal 1f-01, and changes in RF performance of the terminal, ie, the number of transmit/receive antennas and transmit power, may occur. In step 1f-30, the terminal 1f-01 may or may not need a request for a measurement gap for a specific frequency according to a change in measurement performance according to the MO setting included in the RRCReconfiguration message, -02) to be included in the RRCReconfigurationComplete message and delivered dynamically. The corresponding information is auxiliary information necessary for setting and updating the measurement gap, and is called gap setting auxiliary information (GapAssistanceInfo). This may be a 1-bit indicator indicating a request for and release of a measurement gap, such as NeedForGap in LTE, or information including generalized gap pattern information (gap period, gap length, gap offset, etc.). The detailed gap setting assistance information (GapAssistanceInfo) content and application method will be described in detail below.

Looking at the measurement setup situation of scenario 3, the base station 1f-02 receives the measurement information reported by the terminal 1f-01 to the corresponding terminal 1f-01 to instruct handover to a specific cell or change the PSCell. action can be directed. In this case, in step 1f-35, the handover instruction to a specific target cell (eg, the cell of the base station 1f-03) and PSCell change configuration information may be transmitted as reconfigurationWithSync information through the RRCReconfiguration message. That is, in the case of handover, since configuration information in the target cell is transmitted, when the terminal 1f-01 receives the corresponding configuration, the operation of the terminal 1f-01 is changed so that it can connect to the target cell and operate, This may be preceded by a change in the physical performance of the terminal 1f-01. For example, changes in RF performance of the terminal, ie, the number of transmit/receive antennas and transmit power, may occur, and accordingly, measurement performance of neighboring cells may also be changed. In addition, the MO to be measured after handover to the corresponding target cell may be changed, and the measurement configuration may be changed, thereby requiring a measurement gap change. In step 1f-40, the terminal 1f-01 may or may not need a request for a measurement gap for a specific frequency according to a change in measurement performance, and it is included in the RRCReconfigurationComplete message to the base station 1f-02. It can be passed dynamically. The corresponding information is auxiliary information necessary for setting and updating the measurement gap, and is called gap setting auxiliary information (GapAssistanceInfo). This may be a 1-bit indicator indicating a request for and release of a measurement gap, such as NeedForGap in LTE, or information including generalized gap pattern information (gap period, gap length, gap offset, etc.). The detailed gap setting assistance information (GapAssistanceInfo) content and application method will be described in detail below.

As a result of the above three scenarios, the base station 1f-02 may determine whether to update the measurement gap according to the information transmitted by the terminal 1f-01. For example, the base station 1f-02 determines whether to update the measurement gap according to the GapAssistanceInfo transmitted from the terminal 1f-01 through the RRCReconfigurationComplete message (1f-45). That is, the base station 1f-02 determines whether the measurement gap update request information of the terminal 1f-01 is necessary, and includes the measurement configuration information (measConfig) that has updated the measurement gap configuration information in step 1f-50 in the RRCReconfiguration message. can be transmitted. The above measurement gap setting information may include all operations such as setting new measurement gaps (perUE, perFR1, perFR2), changing the measurement gap, and releasing the set measurement gap. Upon receiving this, the terminal 1f-01 may transmit an RRCReconfiguration message informing the base station 1f-01 that reception and application of the RRC message has been completed to the base station 1f-01 in step 1f-55. If, in the above step, the terminal 1f-01 determines that it is necessary to change the measurement gap again, the terminal 1f-01 may include and transmit the corresponding information again. In step 1f-60, the terminal 1f-01 applies measurement configuration information including the measurement gap reset from the base station 1f-02 to perform measurements on neighboring cells. In the case of scenario 3, the operations 1f-50 and 1f-55 may be performed between the terminal 1f-01 and the base station 1f-03.

FIG. 1G is a diagram illustrating an overall operation in which the terminal dynamically transmits measurement gap request information through a specific RRC message and the base station updates the measurement gap information by reflecting it, according to Embodiment 2 to which the present invention is applied. In this embodiment, in consideration of the case where the UE configuration change through MAC CE and DCI (downlink control information) as well as response to RRCReconfiguration delivered by the base station affects the measurement capability of the UE, a measurement gap through a specific RRC message Describes the overall action for requesting a change. The following scenarios can be considered.

1. RRC setting (1g-15, 1g-20): CA setting (1f-15~1f-20), measurement setting (1f-25~1f-30), handover setting (1f-45~1f-40) and the like, the scenario of FIG. 1F.

2. MAC CE configuration: When changing or instructing the configuration of the UE through the MAC CE, such as SCell activation/deactivation indication, CSI or SRS (sounding reference signal) transmission activation/deactivation, etc.

3. DCI configuration: When DCI information is delivered through a physical downlink control channel (PDCCH), and in particular, when instructing BWP (bandwidth part) switching and L1 parameter control, etc.

The terminal 1g-01 in a connected state with the base station 1g-02 receives a request for a terminal capability report from the base station 1g-02 in step 1g-05 through the UECapabilityEnquiry message, and in response to this, in step 1g-10, itself The UECapabilityInformation message is transmitted to the base station 1g-02 by receiving the terminal capability information of In particular, the corresponding terminal capability information message may include capability information of a terminal that dynamically requests a measurement gap and applies a setting. This may be transmitted as 1 bit for each terminal, or 1 bit may be transmitted for each specific band for each band combination. Having confirmed the terminal information, the base station 1g-02 can determine that the corresponding terminal 1g-01 can dynamically request a measurement gap and perform dynamic measurement gap setting accordingly, and perform an operation according to each scenario. different

The measurement gap change request procedures 1g-15 and 1g-20 according to the RRC setting of Scenario 1 correspond to the first embodiment described with reference to FIG. 1F above, and further description is not provided in this embodiment.

Looking at the measurement gap change request procedure (1g-25, 1g-30) according to the MAC CE configuration of Scenario 2, the base station 1g-02 delivered basic terminal configuration information in the RRC configuration information of step 1g-15, The base station 1g-02 may transmit an indication of a specific function through the MAC CE in steps 1g-25. As an example, the case of changing or instructing the configuration of the UE through MAC CE, such as SCell activation/deactivation indication, CSI or SRS transmission activation/deactivation, etc. may be included, and the UE 1g-01 must measure according to the MAC CE configuration. It directly affects the RAT and frequency, and the actual RF performance of the terminal, that is, the number of transmit/receive antennas and transmit power may be changed. In step 1g-30, the terminal 1g-01 includes measurement gap request auxiliary information (auxiliary information required for setting and updating a measurement gap, called gap configuration auxiliary information (GapAssistanceInfo)) in an RRC message such as UEAssistaqnceInformation. and can be transmitted to the base station 1g-02. The above message may be a separate new RRC message, and a prohibit timer may be introduced to prevent the corresponding message from being requested again for a specific time. Related settings for the Prohibit timer and the like may be included in the previous RRCReconfiguration. GapAssistanceInfo may be a 1-bit indicator indicating request and release of a measurement gap, such as NeedForGap in LTE, or information including generalized gap pattern information (gap period, gap length, gap offset, etc.). The detailed gap setting assistance information (GapAssistanceInfo) content and application method will be described in detail below.

Looking at the measurement gap change request procedure (1g-35, 1g-40) according to the DCI configuration of Scenario 3, the base station 1g-02 transmits basic terminal configuration information from the RRC configuration information of steps 1g-15 to the terminal 1g- 01), and the base station 1g-02 may transmit an indication of a specific function through DCI in steps 1g-35. For reference, the DCI is a downlink control signal transmitted through the PDCCH. As an example, BWP (bandwidth part) switching, L1 parameter control and indication (CSI measurement full red type and resource, SRS transmission type and resource, resource scheduling, etc.) may be included, and the RAT and It directly affects the frequency, and the actual RF performance of the terminal, that is, the number of transmit/receive antennas and transmit power may change. In step 1g-40, the terminal 1g-01 includes measurement gap request auxiliary information (auxiliary information required for setting and updating the measurement gap, called gap configuration auxiliary information (GapAssistanceInfo)) in an RRC message such as UEAssistaqnceInformation. and can be transmitted to the base station 1g-02. The above message may be a separate new RRC message, and a prohibit timer may be introduced to prevent the corresponding message from being requested again for a specific time. Related settings for the Prohibit timer and the like may be included in the previous RRCReconfiguration. GapAssistanceInfo may be a 1-bit indicator indicating request and release of a measurement gap, such as NeedForGap in LTE, or information including generalized gap pattern information (gap period, gap length, gap offset, etc.). The detailed measurement gap setting assistance information (GapAssistanceInfo) content and application method will be described in detail below.

According to the above three scenarios, the base station 1g-02 receives measurement gap configuration assistance information (GapAssistanceInfo) from the terminal 1g-01 through an RRC message, and based on this, what measurement is performed to the terminal in step 1g-45. Decide whether to set the gap. In step 1g-50, the base station 1g-02 receives the measurement gap configuration information determined to the terminal 1g-01 in the RRCReconfiguration message and delivers it to the terminal 1g-01. This corresponds to measGapConfig in measConfig of the RRCReconfiguration message, and the detailed ASN.1 structure was described in FIG. 1E. In this step, the base station 1g-02 sets the appropriate gap information for the terminal capability information and measurement among the measurement gap for each terminal, the measurement gap for each FR1, and the measurement gap for each FR2 to the terminal 1g-01, and the set gap is It is set by referring to possible gap patterns. In step 1g-55, the terminal 1g-01 generates and transmits an RRCReconfigurationComplete message in order to notify that the application of the configuration information and the response to the received RRCReconfiguration message is complete. In step 1g-60, the UE 1g-01 applies the RRC configuration information set in step 1g-50, and in particular, applies the newly set measurement gap configuration to perform neighbor cell measurement.

FIG. 1H is a diagram illustrating an overall operation in which a terminal dynamically transmits measurement gap request information through a MAC CE and a base station updates measurement gap information by reflecting it, according to a third embodiment to which the present invention is applied. In this embodiment, considering not only the response to the RRCReconfiguration delivered by the base station, but also the case where the terminal configuration change through MAC CE and DCI affects the measurement capability of the terminal, the entire requesting for a measurement gap change through the new MAC CE Describe the action. The following scenarios can be considered.

1. RRC setting (1h-15, 1h-20): CA setting (1f-15~1f-20), measurement setting (1f-25~1f-30), handover setting (1f-45~1f-40) and the like, the scenario of FIG. 1F.

2. MAC CE configuration (1h-25, 1h-30): When changing or instructing the configuration of the UE through the MAC CE, such as SCell activation/deactivation indication, CSI or SRS transmission activation/deactivation, etc. Scenario in Fig. 1G.

3. DCI setting (1h-35, 1h-40): In case of transmitting DCI information through PDCCH, especially instructing BWP switching and L1 parameter control, etc.

The terminal 1h-01 in a connected state with the base station 1h-02 receives a request for a terminal capability report from the base station 1h-02 in step 1h-05 through the UECapabilityEnquiry message, and in response to this, in step 1h-10, itself The UECapabilityInformation message is delivered to the base station 1h-02 by receiving the terminal capability information of In particular, the corresponding terminal capability information message may include capability information of a terminal that dynamically requests a measurement gap and applies a setting. This may be transmitted as 1 bit for each terminal, or 1 bit may be transmitted for each specific band for each band combination. The base station 1h-02, which has confirmed the terminal information, can determine that the corresponding terminal 1h-01 can dynamically request a measurement gap and perform dynamic measurement gap setting accordingly, and perform an operation according to each scenario. different

The measurement gap change request procedures 1h-15 and 1h-20 according to the RRC setting of Scenario 1 correspond to the first embodiment described with reference to FIG. 1F above, and further description is not provided in this embodiment.

Looking at the measurement gap change request procedure (1h-25, 1h-30) according to the MAC CE configuration of Scenario 2, the base station 1h-02 delivered basic terminal configuration information in the RRC configuration information of step 1h-15, The base station 1h-02 may transmit an indication of a specific function through the MAC CE in steps 1h-25. For example, the case of changing or instructing the configuration of the terminal 1h-01 through the MAC CE such as SCell activation/deactivation indication, CSI or SRS transmission activation/deactivation, etc. may be included, and according to the MAC CE configuration, the terminal 1h- 01) directly affects the RAT and frequency to be measured, and changes in RF performance of the actual terminal, ie, the number of transmit/receive antennas and transmit power, may occur. In step 1h-30, the terminal 1h-01 introduces a new MAC CE, and includes measurement gap request auxiliary information (auxiliary information required to set and update a measurement gap, which is called gap configuration assistance information (GapAssistanceInfo)). and can be transmitted to the base station 1h-02. The above message may be a separate new MAC CE message, and a prohibit timer may be introduced to prevent the corresponding message from being requested again for a specific time. Related settings for the Prohibit timer and the like may be included in the previous RRCReconfiguration. GapAssistanceInfo may be a 1-bit indicator indicating request and release of a measurement gap, such as NeedForGap in LTE, or information including generalized gap pattern information (gap period, gap length, gap offset, etc.). The detailed gap setting assistance information (GapAssistanceInfo) content and application method will be described in detail below.

Looking at the measurement gap change request procedure (1h-35, 1h-40) according to the DCI configuration of Scenario 3, the base station 1h-02 delivered basic terminal configuration information in the RRC configuration information of steps 1h-15, and the base station (1h-02) may transmit an indication of a specific function through DCI in steps 1h-35. For reference, the DCI is a downlink control signal transmitted through the PDCCH. As an example, BWP (bandwidth part) switching, L1 parameter control and indication (CSI measurement full red type and resource, SRS transmission type and resource, resource scheduling, etc.) may be included, and according to the corresponding DCI configuration information, the terminal 1h-01 It directly affects the RAT and frequency to be measured, and changes in the RF performance of the actual terminal, ie, the number of transmit/receive antennas and transmit power, may occur. In step 1h-40, the terminal 1h-01 introduces a new MAC CE and includes measurement gap request auxiliary information (auxiliary information necessary for setting and updating a measurement gap, which is called gap configuration assistance information (GapAssistanceInfo).) and can be transmitted to the base station 1h-02. The above message may be a separate new MAC CE, and a prohibit timer may be introduced to prevent the message from being requested and re-requested for a specific time. Related settings for the Prohibit timer and the like may be included in the previous RRCReconfiguration. GapAssistanceInfo may be a 1-bit indicator indicating request and release of a measurement gap, such as NeedForGap in LTE, or information including generalized gap pattern information (gap period, gap length, gap offset, etc.). Detailed measurement gap setting auxiliary information (GapAssistanceInfo) content and application method will be described in detail below.

According to the above three scenarios, the base station 1h-02 receives measurement gap configuration assistance information (GapAssistanceInfo) from the terminal 1h-01 through a new uplink MAC CE, and based on this, the terminal 1h-45 receives the terminal. Decide which measurement gap to set for (1h-01). In step 1h-50, the base station 1h-02 receives the measurement gap configuration information determined to the terminal 1h-01 in the RRCReconfiguration message and delivers it to the terminal 1h-01. This corresponds to measGapConfig in measConfig of the RRCReconfiguration message, and the detailed ASN.1 structure was described in FIG. 1E. In this step, the base station 1h-02 sets the appropriate gap information for the terminal capability information and measurement among the measurement gap for each terminal, the measurement gap for each FR1, and the measurement gap for each FR2 to the terminal 1h-01, and the set gap is It is set by referring to possible gap patterns. In step 1h-55, the terminal 1h-01 generates an RRCReconfigurationComplete message in order to inform that the application of the configuration information and the response to the received RRCReconfiguration message is completed, and transmits the generated RRCReconfigurationComplete message to the base station 1h-02. In step 1h-60, the terminal 1h-01 applies the RRC configuration information set in step 1h-50, and in particular, applies the newly set measurement gap configuration to perform neighbor cell measurement.

1i is a view showing the overall operation of a terminal applied to various embodiments of the present invention, applied to Embodiments 1, 2, and 3, and dividing the drawings for each embodiment into FIGS. 1iA, 1iB, and 1iC Explain.

FIG. 1iA is a diagram illustrating an overall operation in which the terminal dynamically transmits measurement gap request information through an RRCReconfigurationComplete message and the base station updates the measurement gap information by reflecting the terminal operation according to the first embodiment. In particular, in this embodiment, after the terminal applies the configuration to the RRCReconfiguration message set by the base station, it is determined that a change in the measurement gap is necessary, and the auxiliary information required for updating and reconfiguring the measurement gap is described in the RRCReconfigurationComplete message.

The terminal in the connected state receives a request for a terminal capability report through the UECapabilityEnquiry message in step 1iA-05, receives its own terminal capability information in response to this, and delivers the UECapabilityInformation message to the base station. In particular, the corresponding terminal capability information message may include capability information of a terminal that dynamically requests a measurement gap and applies a setting. This may be transmitted as 1 bit for each terminal, or 1 bit may be transmitted for each specific band for each band combination. Thereafter, in step 1iA-10, the terminal receives the RRCReconfiguration message delivered by the base station, and the message may include CA configuration, measurement configuration, handover configuration, and the like. In step 1iA-15, the terminal determines whether a measurement gap update is necessary based on the information set in step 1iA-10, and if it is determined that a measurement gap update is necessary, generates gap configuration assistance information (GapAssistanceInfo), and 1iA-20 The contents generated in step are received in the RRCReconfigurationComplete message and delivered to the base station. Instead of the RRCReconfigurationComplete, the UE may transmit the UEAssistanceInformation message or the new RRC message by including the gap configuration assistance information (GapAssistanceInfo).

Hereinafter, an RRC structure of gap configuration assistance information (GapAssistanceInfo) applied to an embodiment of the present invention will be described.

First, the gap configuration assistance information (GapAssistanceInfo) reported by the terminal may include at least one of the following information.

- Whether the UE needs a measurement gap (NeedForGap)

- What type of measurement gap is required (per UE gap or per FR1 gap or per FR2 gap)

- Whether a gap pattern is required (gap patterns 0~23 and corresponding detailed settings)

- Whether a measurement gap is required for which MO, that is, an indication of the MO that cannot be measured with the currently set measurement gap

From the ASN.1 code point of view, the GapAssistanceInfo signaling method can be defined as follows.

First, it is setting information related to whether or not a measurement gap is required.

1. First NeedForGap (Measurement Gap Needed) Signaling Method

- In the case of a terminal that does not support independentGapConfig reporting, perUEgapRequirement is set

- In the case of a terminal supporting independentGapConfig reporting, set perFRgapRequirement

For reference, independentGapConfig is a terminal capability indicating whether the terminal can configure two independent measurement gaps (per FR1 and per FR2).

2. Second NeedForGap (Measurement Gap Needed) Signaling Method

- For terminals that do not support independentGapConfig reporting, set both or Not Required

- Any value can be set for terminals supporting independentGapConfig reporting

3. Third NeedForGap (Measure Gap Needed) Signaling Method

- For terminals that do not support independentGapConfig reporting, set none or ue

- Any value can be set for terminals supporting independentGapConfig reporting

The following is how to request a gap pattern. This means that the UE actually reports the required gap pattern in the form of a bitmap, and other fields are supplemented when explicitly requested rather than a part or bitmap that requires additional configuration. As an example, measGapConfig parameters may be included.

The following is a method of signaling whether a measurement gap is needed for which MO. That is, it is a method of reporting MOs that cannot be measured with the currently set measurement gap in the form of a list. At this time, the size of NeedForGapList　 is the number of currently set MOs and may be in the form of a bitmap, or an explicit ID may be requested. In the case of a bitmap, each bit is a request that a measurement gap is required for the index of the corresponding MO. The measurement gap may be determined in association with the frequency included in the MO and the independentGapConfig capability of the UE.

Information/parameters including all of the above or some parameters may be set as GapAssistanceInfo and delivered as an RRC message (RRCReconfigurationComplete, UEAssistanceInformation, or a new RRC message).

FIG. 1iB is a terminal operation according to the second embodiment, illustrating an overall operation in which the terminal dynamically transmits measurement gap request information through a UEAssistaanceInformation RRC message and the base station updates the measurement gap information by reflecting it. In particular, this embodiment is characterized in that the UE can transmit the measurement gap request even when receiving a configuration instruction through MAC CE or DCI as well as the RRCReconfiguration message configured by the base station.

The terminal in the connected state receives a request for a terminal capability report through the UECapabilityEnquiry message in step 1iB-05, receives its own terminal capability information in response to this, and delivers the UECapabilityInformation message to the base station. In particular, the corresponding terminal capability information message may include capability information of a terminal that dynamically requests a measurement gap and applies a setting. This may be transmitted as 1 bit for each terminal, or 1 bit may be transmitted for each specific band for each band combination. Thereafter, in step 1iB-10, the terminal receives the RRCReconfiguration message delivered by the base station, and the message may include CA configuration, measurement configuration, handover configuration, and the like. In step 1iB-15, the UE determines whether a measurement gap update is necessary based on the information set in the above step. If it is determined that the measurement gap update is necessary, the UE generates gap configuration assistance information (GapAssistanceInfo) in step 1iB-20, stores the content generated in step 1iB-25 in the RRCReconfigurationComplete message, and delivers it to the base station. Instead of the RRCReconfigurationComplete, the UE may transmit the UEAssistanceInformation message or the new RRC message by including the gap configuration assistance information (GapAssistanceInfo).

In step 1iB-15, the UE determines whether the measurement gap update is necessary based on the configured RRCReconfiguration information, and if it is determined that the measurement gap update is not necessary, the UE applies the corresponding configuration information to transmit/receive data. In step 1iB-30, when the UE receives a new configuration instruction through MAC CE or DCI, in step 1iB-35, based on the information received in step 1iB-35, it is determined whether a measurement gap update is necessary, and information requesting a measurement gap is generated. can The information follows the RRC message structure described in 1iA above, and the difference is that it is received as a UEAssistanceInformation message. In step 1iB-40, the terminal transmits the UEAssistanceInformation message including the generated measurement gap information to the base station.

FIG. 1iC is an operation of the terminal according to the third embodiment, showing an overall operation in which the terminal dynamically transmits measurement gap request information through a new MAC CE message and the base station updates the measurement gap information by reflecting it. In particular, this embodiment is characterized in that the UE can transmit the measurement gap request even when receiving a configuration instruction through MAC CE or DCI as well as the RRCReconfiguration message configured by the base station.

The terminal in the connected state receives a request for a terminal capability report through the UECapabilityEnquiry message in step 1iC-05, receives its own terminal capability information in response to this, and delivers the UECapabilityInformation message to the base station. In particular, the corresponding terminal capability information message may include capability information of a terminal that dynamically requests a measurement gap and applies a setting. This may be transmitted as 1 bit for each terminal, or 1 bit may be transmitted for each specific band for each band combination. Thereafter, in step 1iC-10, the UE receives the RRCReconfiguration message delivered by the base station, and the message may include CA configuration, measurement configuration, handover configuration, and the like. In step 1iC-15, the UE determines whether a measurement gap update is necessary based on the information set in the above step. If it is determined that the measurement gap update is necessary, the UE generates gap configuration assistance information (GapAssistanceInfo) in step 1iC-20, stores the content generated in step 1iC-25 in the RRCReconfigurationComplete message, and delivers it to the base station. Instead of the RRCReconfigurationComplete, the UE may transmit the UEAssistanceInformation message or the new RRC message by including the gap configuration assistance information (GapAssistanceInfo).

In step 1iC-15, the UE determines whether a measurement gap update is necessary based on the configured RRCReconfiguration information. If it is determined that the measurement gap update is not necessary, the UE performs data transmission/reception by applying the corresponding configuration information. In step 1iC-30, when the UE receives a new configuration instruction through MAC CE or DCI, in step 1iC-35, based on the information received in step 1iC-35, it is determined whether a measurement gap update is necessary, and information requesting a measurement gap is generated. can In step 1iC-40, the UE transmits the new MAC CE including the generated measurement gap information to the base station.

The structure of the MAC CE applied to the third embodiment is as follows.

- Serving cell identifier (1iC-45): an index indicating a serving cell with a size of 5 bits

- BWP identifier (1iC-50): an index indicating a specific BWP of the corresponding serving cell with a size of 2 bits (not essential, may be included if necessary for intra-frequency measurement)

- Measurement Object Identifier (1iC-55): 6 bits, variable depending on the maximum MO size. Alternatively, it can be in the form of a bitmap having a length of 8 bytes and each bit indicating one MO.

- Measurement gap pattern information (1iC-60): 3 bytes of BITMAP (consisting of 24 entries) or parameter information necessary for measurement gap setting can be added.

1J is a diagram illustrating an operation of a base station according to various embodiments of the present disclosure.

In step 1j-05, the base station requests the terminal capability report from the connected terminal through the UECapabilityEnquiry message, and in response thereto receives the terminal capability information from the terminal through the UECapabilityInformation message. In particular, the corresponding terminal capability information message may include capability information of a terminal that dynamically requests a measurement gap and applies a setting. This may be transmitted as 1 bit for each terminal, or 1 bit may be transmitted for each specific band for each band combination. Thereafter, in step 1j-10, the base station generates and transmits an RRCReconfiguration message in consideration of the capability of the terminal, and the message may include CA configuration, measurement configuration, handover configuration, and the like. In step 1j-15, the base station may receive a message including gap configuration assistance information (GapAssistanceInfo) from the terminal. This may be contained in the RRCReconfigurationComplete message, and may be a new RRC message, for example, a UEAssistanceInformation message or a new MAC CE message. In step 1j-20, the base station determines whether to reflect it based on the received measurement gap request information, and when it is determined that an update of the measurement gap is necessary, RRC reset including configuration information for the updated measurement gap forwarded to the terminal.

1K is a diagram illustrating a configuration of a Tamar according to various embodiments of the present disclosure.

Referring to the drawings, the terminal includes a radio frequency (RF) processing unit 1k-10, a baseband processing unit 1k-20, a storage unit 1k-30, and a control unit 1k-40. .

The RF processing unit 1k-10 performs a function for transmitting and receiving a signal through a wireless channel, such as band conversion and amplification of the signal. That is, the RF processor 1k-10 up-converts the baseband signal provided from the baseband processor 1k-20 into an RF band signal, transmits it through an antenna, and receives the RF band signal through the antenna. down-converts to a baseband signal. For example, the RF processing unit 1k-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), an analog to digital converter (ADC), and the like. can In the figure, only one antenna is shown, but the terminal may include a plurality of antennas. Also, the RF processing unit 1k-10 may include a plurality of RF chains. Furthermore, the RF processing unit 1k-10 may perform beamforming. For the beamforming, the RF processing unit 1k-10 may adjust the phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements. In addition, the RF processing unit 1k-10 may perform MIMO, and may receive multiple layers when performing MIMO operation.

The baseband processing unit 1k-20 performs a function of converting between a baseband signal and a bit stream according to a physical layer standard of the system. For example, when transmitting data, the baseband processing unit 1k-20 generates complex symbols by encoding and modulating a transmitted bit stream. Also, when receiving data, the baseband processing unit 1k-20 restores a received bit stream by demodulating and decoding the baseband signal provided from the RF processing unit 1k-10. For example, in the case of orthogonal frequency division multiplexing (OFDM), when transmitting data, the baseband processing unit 1k-20 encodes and modulates a transmitted bit stream to generate complex symbols, and convert the complex symbols to subcarriers. After mapping to , OFDM symbols are constructed through inverse fast Fourier transform (IFFT) operation and cyclic prefix (CP) insertion. In addition, upon data reception, the baseband processing unit 1k-20 divides the baseband signal provided from the RF processing unit 1k-10 into OFDM symbol units, and sends them to subcarriers through a fast Fourier transform (FFT) operation. After reconstructing the mapped signals, the received bit stream is reconstructed through demodulation and decoding.

The baseband processing unit 1k-20 and the RF processing unit 1k-10 transmit and receive signals as described above. Accordingly, the baseband processing unit 1k-20 and the RF processing unit 1k-10 may be referred to as a transmitter, a receiver, a transceiver, or a communication unit. Furthermore, at least one of the baseband processing unit 1k-20 and the RF processing unit 1k-10 may include a plurality of communication modules to support a plurality of different radio access technologies. In addition, at least one of the baseband processing unit 1k-20 and the RF processing unit 1k-10 may include different communication modules to process signals of different frequency bands. For example, the different wireless access technologies may include a wireless LAN (eg, IEEE 802.11), a cellular network (eg, LTE), and the like. In addition, the different frequency bands may include a super high frequency (SHF) (eg, 2.NRHz, NRhz) band and a millimeter wave (eg, 60GHz) band.

The storage unit 1k-30 stores data such as a basic program, an application program, and setting information for the operation of the terminal. In particular, the storage unit 1k-30 may store information related to a second access node that performs wireless communication using a second wireless access technology. In addition, the storage unit 1k-30 provides stored data according to the request of the control unit 1k-40.

The controller 1k-40 controls overall operations of the terminal. For example, the control unit 1k-40 transmits and receives signals through the baseband processing unit 1k-20 and the RF processing unit 1k-10. In addition, the control unit 1k-40 writes and reads data in the storage unit 1k-30. To this end, the control unit 1k-40 may include at least one processor. For example, the controller 1k-40 may include a communication processor (CP) that controls for communication and an application processor (AP) that controls an upper layer such as an application program. Also, the control unit 1k-40 may further include a multi-connection processing unit 1k-42. The controller 1k-40 may control the operation of the terminal according to various embodiments of the present invention.

11 is a diagram illustrating a configuration of a base station according to various embodiments of the present invention.

As shown in the figure, the base station includes an RF processing unit 11-10, a baseband processing unit 11-20, a backhaul communication unit 11-30, a storage unit 11-40, and a control unit 11-50. is comprised of

The RF processing unit 11-10 performs a function for transmitting and receiving a signal through a wireless channel, such as band conversion and amplification of the signal. That is, the RF processor 11-10 up-converts the baseband signal provided from the baseband processor 11-20 into an RF band signal, transmits it through an antenna, and receives the RF band signal through the antenna. down-converts to a baseband signal. For example, the RF processing unit 11-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like. Although only one antenna is shown in the drawing, the first access node may include a plurality of antennas. Also, the RF processing unit 11-10 may include a plurality of RF chains. Furthermore, the RF processing unit 11-10 may perform beamforming. For the beamforming, the RF processing unit 11-10 may adjust the phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements. The RF processing unit may perform a downlink MIMO operation by transmitting one or more layers.

The baseband processing unit 11-20 performs a function of converting between a baseband signal and a bit stream according to the physical layer standard of the first radio access technology. For example, when transmitting data, the baseband processing unit 11-20 generates complex symbols by encoding and modulating a transmitted bit stream. Also, upon data reception, the baseband processing unit 11-20 restores a received bit stream by demodulating and decoding the baseband signal provided from the RF processing unit 11-10. For example, in the OFDM scheme, when data is transmitted, the baseband processing unit 11-20 generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then IFFT OFDM symbols are constructed through operation and CP insertion. Also, upon data reception, the baseband processing unit 11-20 divides the baseband signal provided from the RF processing unit 11-10 into OFDM symbol units, and restores signals mapped to subcarriers through FFT operation. After that, the received bit stream is restored through demodulation and decoding. The baseband processing unit 11-20 and the RF processing unit 11-10 transmit and receive signals as described above. Accordingly, the baseband processing unit 11-20 and the RF processing unit 11-10 may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

The backhaul communication unit 11-30 provides an interface for communicating with other nodes in the network. That is, the backhaul communication unit 11-30 converts a bit string transmitted from the base station to another node, for example, an auxiliary base station, a core network, etc. into a physical signal, and converts the physical signal received from the other node into a bit string. convert to

The storage unit 11-40 stores data such as a basic program, an application program, and setting information for the operation of the base station. In particular, the storage unit 11-40 may store information on a bearer allocated to an accessed terminal, a measurement result reported from the accessed terminal, and the like. In addition, the storage unit 11-40 may store information serving as a criterion for determining whether to provide or stop multiple connections to the terminal. In addition, the storage unit 11-40 provides the stored data according to the request of the control unit 11-50.

The controller 11-50 controls overall operations of the base station. For example, the control unit 11-50 transmits and receives signals through the baseband processing unit 11-20 and the RF processing unit 11-10 or through the backhaul communication unit 11-30. In addition, the control unit 11-50 writes and reads data in the storage unit 11-40. To this end, the controller 11-50 may include at least one processor. In addition, the control unit 11-50 may further include a multi-connection processing unit 11-52. The controller 11-50 may control the operation of the base station according to various embodiments of the present invention.

In the specific embodiments of the present invention described above, elements included in the invention are expressed in the singular or plural according to the specific embodiments presented. However, the singular or plural expression is appropriately selected for the context presented for convenience of description, and the present invention is not limited to the singular or plural element, and even if the element is expressed in plural, it is composed of the singular or singular. Even an expressed component may be composed of a plurality of components.

Meanwhile, although specific embodiments have been described in the detailed description of the present invention, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments and should be defined by the claims described below as well as the claims and equivalents.

Claims (1)

A control signal processing method in a wireless communication system, comprising:
receiving a first control signal transmitted from a base station;
processing the received first control signal; and
and transmitting a second control signal generated based on the processing to the base station.

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