KR102411643B1 - Method of QoS support for Data transfer in inactive state - Google Patents

Abstract

The present disclosure relates to a 5G or pre-5G communication system for supporting a higher data rate after a 4G communication system such as LTE. A method for processing a control signal in a wireless communication system, comprising: receiving a first control signal transmitted from a base station; processing the received first control signal; and applying a second control signal generated based on the processing to the base station Disclosed is a control signal processing method comprising the step of transmitting to.

Description

QoS determination and support method and apparatus for RRC INACTIVE state data transfer { Method of QoS support for Data transfer in inactive state }

The present invention is a technology for operating methods of a base station and a terminal for achieving Energy Efficiency KPI, which is being discussed in a wireless communication system. The standard defines energy-efficient operation with the main goal of improving the power efficiency [bit/J] of terminals and base station networks by more than 1000 times within the next 10 years. To this end, in order to solve the possibility of additional power consumption due to the beamforming transmission method, which is essential during mmW operation in the high frequency band, a discussion is being started on a control for reducing the active operation time of the terminal.

The technology proposed in the present invention relates to a method for controlling and maintaining an RRC connection based on three RRC states, Connected_Active, Connected_Inactive, and Idle, which are to be applied in a mobile communication system (5G or NR). In particular, a method for determining the RRC state (Inactive and (or) Active) for data transmission and a function to improve the spectral efficiency and channel access method for the case of efficiently performing transmission in the RRC Inactive state during traffic transmission of the UE How to support

Meanwhile, the present invention describes mobility in a connected inactive state (hereinafter, inactive state) discussed in 5G (5th Generation) communication or New Radio (NR), which is a next-generation mobile communication system. The inactive state is a technology proposed to achieve the Energy Efficiency KPI discussed in 3GPP RAN 5G SI. When the terminal operates in the inactive state, it is expected to bring the effects of power saving and battery life extension through energy-efficient operation.

In addition, the present invention relates to PHY/MAC/RLC layer operations of a terminal and a base station in a mobile communication system. More specifically, when performing handover that transfers the terminal's connection from one base station to another, support to maintain service continuity by measurement and handover procedures according to the service used by the terminal and the related PHY/MAC layer settings It is about a method and apparatus for doing it.

In addition, the present invention relates to an operation in which a terminal determines whether to measure signal strength with respect to a neighboring base station in a mobile communication system. More specifically, when the serving base station is transmitting NR-SS or CSI-RS, the UE measures the signal strength for it, and then determines whether s-Measure for NR-SS is satisfied and whether s-Measure for CSI-RS is satisfied. Therefore, an operation for determining whether to measure NR-SS or CSI-RS transmitted by a neighboring base station is proposed.

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 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 alleviate 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), an ultra-dense network (ultra-dense network) ), Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and reception interference cancellation ) and other technologies are being developed.

In addition, in the 5G system, advanced coding modulation (ACM) methods such as FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), and advanced access technologies such as Filter Bank Multi Carrier (FBMC), NOMA (non orthogonal multiple access), and sparse code multiple access (SCMA) are being developed.

Meanwhile, in the present invention, the need for a method for improving the function of a terminal in a wireless communication system has emerged.

The design of the RRC state for the wireless communication terminal to transmit and receive data was designed too conservatively with the design philosophy of the previous generation focusing on voice calls. For example, even if there is no traffic arrival for a certain period of time after traffic is received, the standby time such as RRC connected (Connected DRX) is maintained, and power consumption due to this is serious. In addition, in the case of smartphone users, keep alive messages, etc., which are not related to user QoS, are frequently generated as data.

Therefore, in this patent, the main content is to improve the method for supporting QoS of data transmission when the base station in which the terminal is located is changed in consideration of the method of supporting QoS in a situation where data transmission is performed in the RRC INACTIVE state and the mobility of the terminal.

On the other hand, the RAN notification area called the Tracking Area (TA) or the Paging Area (PA) of the UE is configured once and is not changed until reconnection. However, as a result of the theoretical experiment [ FIG. 2B ], it was confirmed that the number of RRC signaling and CN signaling including X2 and S1 varies according to the size of the RAN notification area. In particular, the tendency was conspicuous depending on the situation of the terminal, for example, the moving speed of the terminal or the frequency with which the terminal exchanges traffic.

Therefore, the present invention proposes a method of optimizing the RAN notification area in a direction to minimize the number of CN signaling messages according to the terminal situation (eg, terminal movement speed, terminal traffic pattern, etc.).

Meanwhile, mobile communication systems have evolved from 2G, which supports only voice, to 3G and 4G to support both voice and data. In particular, OFDMA was introduced to expand data capacity in 4G, and voice was supported as a packet system just like data. Therefore, in the existing 4G LTE, voice and data services were supported with one PHY/MAC. However, in LTE, in order to support additional new services, that is, broadcasting, D2D, V2V, etc., some of the frequency resources are separated and PHY and MAC operations of different structures are defined. However, in the future, it is difficult to satisfy a new standardization and implementation method that takes a long time because various services and an optimized communication system must be provided in a timely manner. Therefore, for the 5G New Radio mobile communication system, a communication standard in an expandable form is being discussed in 3GPP so that various services to be implemented in the future can be supported with one standard.

Meanwhile, to support various services, PHY/MAC must support various structures, mechanisms, and protocols. In particular, the PHY layer may have various physical layer structures (eg, subcarrier spacing, symbol length, CP length, subframe length, slot length, operating BW, reference signal, etc.). This physical layer structure is collectively called Numerology. In general, the terminal measures the channel performance of the target base station for a handover procedure for mobility support and reports it to the network. If the target base station has a plurality of different numerology and the communication range for each numerology, that is, the link performance, or the reception required performance is different, the terminal should be able to move to a base station suitable for each numerology. Also, even if the target base station supports the requested service of the terminal, a different numerology may be used in the support method. In this case, the UE may not be able to perform appropriate measurement due to the operation of the serving cell. Therefore, in the present invention, measurement, triggering condition, and RRM resource resetting and handover procedures divided by numerology are handled.

Also, when the serving base station is transmitting several types of reference signals, it is not clear on which reference signal strength the terminal should measure the neighboring base stations. One embodiment of the present invention is intended to solve this problem.

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 an embodiment of the present invention, through the present invention, when the communication system of the terminal and the base station selects the RRC state for data transmission and transmits data directly from the Inactive state while performing a procedure for this, it transitions to the RRC Connected_Active state. (Transition) is not performed, so standby time (C-DRX, radio tail) in the active state is kept to a minimum, so the power consumption saving effect of the terminal is expected. In addition, by transmitting data without an RRC release message for RRC state transition, when data is transmitted in the Inactive (Idle) state, the RRC state does not transition to Connected_active, so the delay required for related Control Signaling is eliminated and data transmission delay is reduced. It works. In addition, the reduction of the RRC release message for RRC state transition is expected to increase the efficiency of using radio resources through cost efficiency through reduction of power consumption of 5G base stations (RU/TRP) and reduction of peripheral interference between 5G cells.

According to another embodiment of the present invention, through the present invention, the terminal and the base station can reduce unnecessary RRC signaling or CN signaling including X2 and S1 by configuring a RAN notification area optimized for the terminal movement speed and terminal traffic pattern. By reducing CN signaling, the network can also expect unnecessary waste of resources and reduction of power consumption. In addition, it is possible to omit the RRC transition procedure for PA Update by proposing a method for the UE to perform PA Update while maintaining the inactive state, thereby reducing resource and UE power consumption.

According to another embodiment of the present invention, according to the measurement and triggering conditions divided for each numerology proposed in the present invention, the terminal or the base station may determine the decision for handover or the RRM resource reset according to the measurement result divided by the numerology. . According to the measurement result divided by service and mapped numerology, the UE can reduce unnecessary reporting, and the base station can accurately perform a handover decision or an RRM resource resetting decision. RRM resource reconfiguration can be reset to enable normal measurement and reporting when measurement is impossible, performance is not obtained properly, or there is a delay in reporting of the UE due to a difference in RRM resource configuration with a neighboring base station.

In addition, using the method proposed in the present invention, when the serving base station is transmitting several types of reference signals, it is possible to determine whether to perform a measurement operation on a neighboring base station based on the received signal strength of a certain signal.

1A is a diagram schematically showing the structure of a (5G, NR) communication system according to an embodiment of the present invention;
1b is a diagram showing an example of operation of three RRC states, Connected_Active, Connected_Inactive, and Idle, which are scheduled to be applied in a (5G, NR) communication system according to an embodiment of the present invention;
1c is a view showing an example of the state of the terminal and the base station MME in an inactive state in a (5G, NR) communication system according to an embodiment of the present invention;
1d is a diagram illustrating an example of state transition between C-IoT, NB-IoT, UE context and RRC state (idle, Connected_Active, Connected_Inactive) in the previous standard 3GPP Rel 13;
FIG. 1E is a diagram illustrating UE context (information addition) transmission and DRB reconfiguration operation for data transmission operation in INACTIVE state in an NR system according to an embodiment of the present invention; FIG.
1F is a diagram illustrating UE context (information addition) transmission and DRB reconfiguration operation for data transmission operation in consideration of terminal movement in an INACTIVE state according to an embodiment of the present invention; FIG.
1G is a diagram schematically illustrating reflective QoS operation in an NR system;
1H is a diagram illustrating an example of an operation of data transmission after an initial transmission inactive state and subsequent RRC active state transition for supporting QoS of URLLC traffic according to an embodiment of the present invention; FIG.
1I is a diagram illustrating an example of an operation of transmitting an initial transmission and subsequent data transmission within an RRC Inactive state for supporting QoS of URLLC traffic according to an embodiment of the present invention; FIG.
2A is a diagram schematically showing the structure of a (5G, NR) communication system according to an embodiment of the present invention;
Figure 2b is a diagram showing the effect of the present invention as a theoretical experimental result. When FTP1 traffic is transmitted, the number of X2 and S1 signaling messages according to the terminal speed and PA size is shown. Specifically, Figure 2b-01 is 10 seconds Results when FTP traffic is transmitted once, FIG. 2b-02 is a result when FTP traffic is transmitted once in 30 seconds, and FIG. 2b-03 is a diagram showing results when FTP traffic is transmitted once in 60 seconds
Figure 2c is a diagram showing a PA optimization time according to the change of the terminal PA of the present invention
Figure 2d is a diagram showing a PA optimization trigger time in the terminal PA of the present invention;
Figure 3a is a view showing the existing LTE Measurement and Handover procedure;
Figure 3b is a diagram showing a plurality of Numerologies support example-I of the FDM method
Figure 3c is a view showing a plurality of Numerologies support example-II of the FDM method
3D is a diagram showing an example of supporting multiple Numerologies of the TDM method
3e is a diagram showing an example of dynamic service support of a 5G NR communication network
3f is a diagram showing the Measurement Framework of LTE
3G is a diagram showing an example of a Carrier-specific Measurement Framework with sub-objects;
Figure 3h is a diagram showing an example of Numerology-specific Measurement Framework;
Figure 3i is a diagram showing an example measurement and reporting procedure -I
Figure 3j is a diagram showing an example measurement and reporting procedure -II
Figure 3k is a diagram showing an example measurement and reporting procedure -III
Figure 3l is a diagram showing an example measurement and reporting procedure -IV
Figure 3m is a diagram showing an example when there is no resource and numerology change for RRM Measurement
3n is a diagram showing an example of a case where there is a resource and numerology change for RRM Measurement
3O is a diagram illustrating Example-I of base station control RRM measurement reconfiguration
3p is a diagram showing Example-II of base station control RRM measurement reconfiguration
3q is a diagram illustrating Example-I of terminal control RRM measurement reconfiguration
3r is a diagram illustrating Example-II of terminal control RRM measurement reconfiguration
3S is a diagram illustrating Example-III of terminal control RRM measurement reconfiguration
3t is a diagram illustrating an example-IV of terminal control RRM measurement reconfiguration
Figure 3u is a view showing a measurement method applied to the existing serving base station ABS indication
Figure 3v is a view showing a measurement method applying the serving base station and the neighbor base station ABS indication
3w is a diagram illustrating a measurement method to which a numerology pattern of a serving base station and a neighboring base station is applied;
3x is a diagram illustrating a configuration diagram of a terminal.
3Y is a diagram illustrating an operation of a terminal according to various examples of the present invention.
3z is a flowchart of a part of measurement setup and operation of the base station. FIG. 4a is an example in which the NR base station transmits NR-SS and CSI-RS, wherein NR-PSS/NR-SSS corresponds to NR-SS and MRS ( Mobility RS) corresponds to the CSI-RS.
Figure 4b corresponds to a flowchart of a method of operating s-Measure when the base station is operating both NR-SS and CSI-RS.
4C shows an operation in which the LTE base station provides information necessary for measuring the NR base station to the terminal for NR cell measurement of the terminal.
4D shows a method for the UE to derive the cell quality of a base station using a plurality of beams.
4E shows a method for the UE to derive cell quality from a plurality of beam signal strength measurement results.
4F shows a method for the UE to derive cell quality from measurement results of a plurality of beam signal strengths using an absolute threshold value.
4G shows a method in which the UE derives cell quality from measurement results of a plurality of beam signal strengths by using a relative offset value.
4H is a diagram illustrating the structure of a terminal according to an embodiment of the present invention.
4I is a diagram illustrating the structure of a base station according to an embodiment of the present invention.

<First embodiment>

The present invention is a technology for operating methods of a base station and a terminal to achieve Energy Efficiency KPI discussed in 3GPP RAN 5G SI. The standard defines energy-efficient operation with the main goal of improving the power efficiency [bit/J] of terminals and base station networks by more than 1000 times within the next 10 years. To this end, in order to solve the possibility of additional power consumption due to the beamforming transmission method, which is essential during mmW operation in the high frequency band, a discussion is being started on a control for reducing the active operation time of the terminal.

The technology proposed in the present invention relates to a method for controlling and maintaining an RRC connection based on three RRC states, Connected_Active, Connected_Inactive, and Idle, which are to be applied in a mobile communication system (5G or NR). In particular, a method for determining the RRC state (Inactive and (or) Active) for data transmission and a function to improve the spectral efficiency and channel access method for a case where transmission is efficiently performed in the RRC Inactive state during traffic transmission of the UE How to support

The design of the RRC state for the wireless communication terminal to transmit and receive data was designed too conservatively with the design philosophy of the previous generation focusing on voice calls. For example, even if there is no traffic arrival for a certain period of time after traffic is received, the standby time such as RRC connected (Connected DRX) is maintained, and power consumption due to this is serious. In addition, in the case of smartphone users, keep alive messages, etc., which are not related to user QoS, are frequently generated as data.

Therefore, the main contents of this patent are the RRC state (Inactive and (or) Active) determination method for data transmission and the improvement of the spectral efficiency and the channel access method for efficiently transmitting the traffic of the UE in the RRC Inactive state.

1A, the gNBs are connected to the UE through a radio channel to the base stations and perform more complex roles than the existing (UMTS) NodeB and LTE eNodeB base stations.

In the mobile communication system, all user traffic including real-time services such as VoIP (Voice over IP) service through Internet protocol are serviced through a shared channel, so buffer status of UEs, available transmission power status, channel status, etc. A device for scheduling by collecting the state information of the gNBs is required, and the gNBs are responsible for this. One gNB usually controls multiple cells. The S-GW is a device that provides a data bearer, and creates or removes a data bearer under the control of the MME. The MME 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 FIG. 1A, the structure of a (5G, NR) communication system according to an embodiment of the present invention has been described. Next, with reference to FIG. 2, a 5G, NR) communication system according to an embodiment of the present invention will be applied to 3 The RRC states of Connected_Active, Connected_Inactive, and Idle will be described.

As shown in FIG. 1B, 3GPP NR operates three RRC states by adding an inactive state to the existing two RRC states, and the UE has decided to operate with one RRC state at a time.

1c (5G, NR) is a diagram showing an example of the state of the terminal and the base station MME in the Inactive state in the communication system. In the new RRC state, Inactive, the air interface between the terminal and the base station is in a non-connected state, but the core network of the base station and the MME is connected. It is assumed that the base station and the MME are stored in the ECM Connected state, and the terminal context is stored by the base station and the MME even if the UE maintains the RRC Connected_Active state with the base station and releases the RRC Connected_Active state. In the last 3GPP RAN2#95 meeting, RAN2 agreed as shown in Table 1 below and discussed data transmission and related issues in the new Inactive state.

Agreements:
1: RRC states with significantly overlapping characteristics should be avoided.
2: At least one RRC state for low activity should meet the NR control plane latency requirement and must be capable of achieving a comparable power efficiency to that of LTE's IDLE state.

1D is a diagram illustrating an example of state transition between C-IoT, NB-IoT, UE context, and RRC state (Idle connected state) in the previous standard 3GPP Release 13.

In order to reduce the RRC transition delay in the existing RRC idle state, it is necessary to omit the S1 connection setup & security procedure. For this, Anchor eNB stores UE context including resume ID for UE confirmation. When the terminal moves in the idle state, when accessing a new base station (gNB), the terminal transmits the corresponding ID to check the identity of the terminal, and the base station to which the terminal is connected (when the terminal is stopped or located within the same cell, the existing base station, when moving In this case, the new base station) retrieves the UE context based on the UE ID and then performs an access procedure. However, since C-IoT and NB-IoT 向 transmission in the previous standard 3GPP Release 13 transmits (RRC resume) data after transitioning to the RRC connected state, a separate DRB setting for the idle state is not set and the corresponding setting is not required.

FIG. 1E is a diagram illustrating UE context (information addition) transmission and DRB reconfiguration operations for data transmission in an INACTIVE state in an NR system according to an embodiment of the present invention.

Same as C-IoT and NB-IoT 向 operation in the previous standard 3GPP Release 13, it operates so that S1 connection establishment & security procedure can be omitted through Resume_ID confirmation for Anchor eNB / UE confirmation.

However, since data transmission is considered in the RRC_Inactive state newly introduced in NR, data transmission is required in the INACTIVE state without transitioning to the RRC Connected_active state (RRC Suspend message transmission and reception). Therefore, a separate DRB configuration for the INACTIVE state is additionally required.

For this purpose, additional information needs to be transmitted as shown in FIG. 1E .

For this, a method of storing and transmitting each or a combination of QoS_ID, QoS_ID to DRB mapping, and NSSAI in addition to resumeID, resumeCause, shortResumeMAC-I, etc. in the existing UE context field

UE context
resumeID, shortResumeMAC-I,
QoS_ID, QoS_ID to DRB mapping, NSSAI

* The resumeID is a unique identity within the paging area of the terminal, and the UE context is stored in the anchor eNB and used (reuse) (Anchor gNB- current gNB) information for checking the UE in forwarding and retrieval operations between the base stations

* QoS_ID is the QoS Flow ID of the traffic to be transmitted by the terminal, and the corresponding information is transmitted to the base station and used as additional information in the DRB configuration

* Based on the DRB mapping rule corresponding to the DL data QoS ID during the active state recorded until recently, the QoS_ID to DRB mapping information stores the corresponding information on which DRB the QoS Flow ID of the traffic to be transmitted by the UE is mapped to the UE context. action to do

* NSSAI is network slice selection assistance information, which is information related to network slice corresponding to the terminal, and transmits the information to the base station and uses it as additional information in the DRB configuration

As an example, when the UE starts data transmission in the Inactive state along with the UE ID and transmission for retrieving the UE context stored in the anchor gNB

How to piggyback the following information as a payload when transmitting RRC connection request or RRC Resume request,

RRC connection request
resumeID, resumeCause (Inactive_data, Active_data),
shortResumeMAC-I, QoS_ID, QoS_ID to DRB mapping, NSSAI

* The resumeID is a unique identity within the paging area of the terminal, and the UE context is stored in the anchor eNB and used (reuse) (Anchor gNB - current gNB) Information for checking the UE in forwarding and retrieval operations between the base stations

* When data transmission starts in the Inactive state, additionally among the resumeCause items, the terminal transmits a resumeCause that transmits data by transitioning to the Inactive state (Inactive_data) or Connected_active state to the base station.

* How to transmit or not to transmit additional information such as QoS_ID and NSSAI according to this resumeCause

- In an embodiment, if resumeCause = Inactive_data, QoS_ID and NSSAI are additionally transmitted

- Alternatively, when resumeCause = Active_data, additionally, a method of operating without transmitting QoS_ID and NSSAI is included.

* QoS_ID is the QoS Flow ID of the traffic to be transmitted by the terminal, and the corresponding information is transmitted to the base station and used as additional information in the DRB configuration

* Based on the DRB mapping rule corresponding to the DL data QoS ID on the active state and the inactive state recorded until recently, the QoS_ID to DRB mapping information is the information on which DRB the QoS Flow ID of the traffic to be transmitted by the terminal is mapped to the base station. operation to transmit to and use as additional information in the DRB configuration

* NSSAI is network slice selection assistance information, which is information related to network slice corresponding to the terminal, and transmits the information to the base station and uses it as additional information in the DRB configuration

As shown below, it is information decided to be supported by the RAN (transmitted to the Core network) according to the SA2 decision.

Study for the Next Generation Architecture [TR23.799] have recently completed in SA2. Some of the agreements on the support of network slicing are presented below:

Agreements:
2. A UE may provide network slice selection assistance information (NSSAI) consisting of a set of parameters to the network to select the set of RAN and CN part of the network slice instances (NSIs) for the UE.
a) The NSSAI can have standard values or PLMN specific values. The NSSAI (which is used to select the CCNF) is a collection of SM-NSSAIs.
b) The UE may store a Configured and/or Accepted NSSAI per PLMN.
- The Configured NSSAI is a NSSAI configured by default in a UE to be used in a PLMN before any interaction with the PLMN ever took place.
- The Accepted NSSAI is the NSSAI used by the UE after the PLMN has accepted an Attach Request from the UE. The Attach Accept message includes the Accepted NSSAI. The accepted NSSAI may be updated by MM procedures (see below).
c) If the UE has been provided a Configured or Accepted NSSAI for the ID of the PLMN that the UE accesses, the UE provides this NSSAI in RRC and NAS as described below.
Each SM-The NSSAI in the NSSAI may include:
Slice/Service type (SST), which refers to the expected network behavior in terms of features and services.
Information that complements the Slice/Service type(s) to allow further differentiation for selecting from the potentially multiple network slice instances that all comply with the indicated slice/service type(s). This information is referred to as Slice Differentiator (SD).
An SM-NSSAI can include both a Slice/Service Type and Slice Differentiator or just the Slice/Service Type.
The RAN routes the initial access to a CCNF using the NSSAI.
NOTE 3: Whether NSSAI in RAN and NAS are exactly the same, is to be determined during normative phase.
..
i) In order for RAN to select a proper resource for supporting network slicing in RAN, RAN may need to be aware of the network slices. How the RAN is aware of this is up to RAN WGs to determine.

This includes a method of performing a DRB setting operation when transmitting data in the RRC Inactive state through a method of transmitting each or a combination of resumeCause (Inactive_data, Active_data), QoS_ID, and NSSAI of the UE context extension.

1F is a diagram illustrating UE context (information addition) transmission and DRB reconfiguration operations for data transmission operation in consideration of terminal movement in an INACTIVE state according to an embodiment of the present invention.

In order to reduce the RRC transition delay in the inactive state, it is necessary to omit the S1 connection establishment & security procedure. For this purpose, Anchor eNB stores UE context including resume ID for UE confirmation. When the terminal moves from Connected_Inactive to a new base station (gNB), the terminal transmits the ID to check the identity of the terminal, and the base station to which the terminal is connected (when the terminal is stopped or located within the same cell, the existing base station, when moving new base station) retrieves the UE context based on the terminal ID and then performs an access procedure.

When the mobile station occurs in the inactive state section and the base station (Anchor gNB) storing the UE context is different from the base station (current gNB) that the current terminal requests data transmission from, this UE context is retrieved from the anchor gNB and then the access procedure is performed. will perform

That is, the UE context is stored in the anchor eNB, which is the last connected_active cell, but there is a possibility that the UE may move in the inactive state after that. Since there is a possibility of being different, the DRB configuration for data transmission in the inactive state includes a method of operating in the following two steps.

Step 1] Storing UE context in Anchor eNB, which is the last connected_active cell, and using it (reuse) (Anchor gNB- current gNB) Forwarding and Retrieve operations between eNBs

When storing UE context in Anchor eNB, which is a recently connected_active cell, UE context content (field)

resumeID, shortResumeMAC-I,

QoS_ID, QoS_ID to DRB mapping, NSSAI

How to set DRB information in the UE context storage and retrieve procedure in step 1 is

* Includes static DRB parameter configuration. In one embodiment, QoS ID to DRB mapping (from recent active state or NSSAI (Network slice selection assistance information) information and combinations are included.

Step 2] When the terminal starts data transmission in the Inactive state

When sending RRC connection request or RRC Resume request

Together with the UE ID and transmission for retrieving the UE context stored in the anchor gNB

How to piggyback the following information as a payload and send it,

resumeID, resumeCause (Inactive_data, Active_data),

shortResumeMAC-I, QoS_ID, QoS_ID to DRB mapping, NSSAI

In response to the RRC connection request or RRC Resume request, the base station

It includes a method of configuring the DRB of the terminal in the operation of transmitting the RRC connection response.

The method of setting DRB information through RRC connection request/response signaling in this step 2 is

* Includes Dynamic DRB parameter configuration. In one embodiment, it includes AMBR and information and combination of DRB based on NW Loading information, which is a time/channel varying parameter.

1G is a diagram schematically illustrating reflective QoS operation in an NR system;

In the last 3GPP RAN2#96 meeting, RAN2 agreed as follows, agreed to reflect Reflective QoS, and discussed related operations.

Agreements
1 For reflective QoS, the UE determines QoS Flow ID to DRB mapping in the uplink based on the downlink packets received within a DRB and applies those filters for mapping uplink Flows to DRBs.
2 The UE "continuously" monitors the QoS Flow ID in downlink PDCP packets and updates the reflective QoS Flow ID to DRB mapping in the uplink accordingly.
3 RRC can configure an uplink mapping
FFS The precedence of the RRC configured mapping and reflective QoS (eg can reflective QoS update an RRC configured mapping)
Working assumptions:
If an incoming UL packet does not match a QoS Flow ID to DRB mapping (neither a configured nor a determined via reflective QoS), the UE shall map that packet to the default DRB of the PDU session.

An example of QoS support operation during data transmission in the inactive state will be described.

Below, the option regarding the QoS support operation during data transmission in the Inactive state includes the operation of setting and transmitting by the base station according to the following method.

* How to store and transmit QoS support operation options when data is transmitted in the inactive state of the corresponding terminal in the UE context

* RRC connection response to RRC connection request How the base station determines and transmits whether the RRC state to be applied when transmitting data (transmitting from Inactive or Transitioning to Active) and the corresponding QoS support operation option

- The base station stores (or retrieved by forwarding from the anchor gNB) UE context and

Based on each and combination of QoS_ID and NSSAI information included in the transmitted RRC connection request message, it determines whether the RRC state to be applied when data is transmitted (either inactive to transmit or to transmit by transitioning from active to active)

How to determine and transmit a corresponding QoS support operation option (in one embodiment, RRC connection response is loaded and transmitted)

* Or new field of System information The options regarding the QoS support operation when transmitting data in the inactive state supported by the corresponding base station include the operation and

and setting or updating (updating) each and a combination of the above methods.

Option 1] Operate as Default DRB (or Operate as Dedicated DRB)

1-1] Transmission is performed with Default DRB for data transmission in the entire RRC Inactive state

The operation of transmitting the corresponding data to the fixed Default DRB (or to the Dedicated DRB) regardless of the QoS_ID of the UE and the previous reflective QoS rule (QoS_ID to DRB mapping)

1-2] Separate DRB creation operation for each QoS ID through (RRC resume message) when the UE switches to RRC Active state

When it is determined that the RRC state transition is necessary from the initial transmission to the active state in addition to the initial transmission to satisfy the performance requirements based on QoS_ID and NSSAI information as a condition for switching the active state

* Based on UE context, QoS_ID, NSSAI information

* Based on QoS_ID and NSSAI information transmitted by the terminal loaded in the RRC connection request

Judging by each and in combination

8. As shown in FIG. 1H, as shown in a diagram showing an example of an operation of data transmission after an initial transmission Inactive state and subsequent RRC active state transition to support QoS of URLLC traffic according to an embodiment of the present invention

In one embodiment, for the traffic flow corresponding to QoS_ID requiring low delay

The initial transmission is transmitted by piggybacking on the RRC connection request (resume request) to the fixed Default DRB (or to the Dedicated DRB).

For subsequent transmission, data is transmitted by creating a separate DRB for each QoS ID based on the DRB configuration set through (RRC reconfiguration) in the RRC connection response.

The UL QoS_ID to DRB mapping of the UE for the DRB configuration configured through (RRC reconfiguration) in this RRC connection response is

A method of initializing and monitoring the PDCCH of DL traffic from the beginning, or

* Based on the UE context, QoS_ID to DRB mapping information

* Based on the QoS_ID to DRB mapping information transmitted by the terminal loaded in the RRC connection request, the UL QoS_ID to DRB mapping rule can be reused and operated.

Option 2] Transfer to Default (or dedicated) DRB after maintaining QoS ID to DRB mapping rule

2-1] Transmission of data in the entire Inactive state with Reflective QoS

* Based on QoS_ID to DRB mapping information stored in UE context

* Based on QoS_ID to DRB mapping information transmitted by the terminal loaded in the RRC connection request

When the UE transmits data in the Inactive state, the operation of transmitting by applying the QoS ID to DRB mapping rule from the initial data transmission

2-2] After that, transfer to Default (fixed dedicated) DRB

The operation of transmitting data in this inactive state with reflective QoS is

* Operates before the validity timer of Reflective QoS expires

- Reflective QoS (QoS ID to DRB mapping) validity Timer (Timer_RQ) is set by the base station

- When switching to RRC inactive, it is loaded in RRC suspend message or

- Operation of broadcasting and update transmission as System Information and

- Timer_RQ is reset when new DL/UL traffic is created and transmitted

* Or, if the corresponding terminal performs data transmission with the connected anchor base station in the last connected_active state, it is transmitted by applying Reflective QoS.

- When the terminal moves to another base station and transmits data in the inactive state, it is then transmitted to the Default (fixed dedicated) DRB

- Or, when the terminal moves to another base station and transmits data in the inactive state, the reflective QoS (QoS ID to DRB mapping rule) transmitted by the terminal through the UE context and/or RRC connection request is applied or updated in the same way in the current base station to correspond A method of transmitting and applying reflective QoS (QoS ID to DRB mapping rule) to the UE as an RRC connection response is included.

Option 3] Transmission method by switching to QoS ID to DRB mapping rule even within inactive state after initial fixed Default (dedicated) DRB transmission

3-1] Initial fixed Default (dedicated) DRB transmission (RRC connection resume request message, based on UE Context)

3-2] Requirement of newly generated DL/UL QoS ID while maintaining RRC inactive state (For example, when Delay is shorter than the threshold value) Separate DRB creation operation for each QoS ID through RRC resume response message

9. As shown in FIG. 1I, as shown in a diagram showing an embodiment of an operation for transmitting an initial transmission and subsequent data transmission within an RRC Inactive state to support QoS of URLLC traffic according to an embodiment of the present invention.

How to preconfigure and apply special DRB for low-latency performance support

In one embodiment, for the traffic flow corresponding to QoS_ID requiring low delay

The initial transmission is transmitted by piggybacking on the RRC connection request (resume request) to the fixed Default DRB (or to the Dedicated DRB).

For subsequent transmission, data is transmitted by creating a separate DRB for each QoS ID based on the special DRB configuration set through (RRC reconfiguration) in the RRC connection response.

<Second embodiment>

The present invention describes mobility in a connected inactive state (hereinafter, inactive state) which is being discussed in 5G (5th Generation) communication or New Radio (NR), which is a next-generation mobile communication system. The inactive state is a technology proposed to achieve the Energy Efficiency KPI discussed in 3GPP RAN 5G SI. When the terminal operates in the inactive state, it is expected to bring the effects of power saving and battery life extension through energy-efficient operation.

The present invention describes a method of designing by optimizing the size of the Paging Area (PA) of the terminal. Although the subject mentioned in the present invention is PA, it may be extended to a RAN notification area including a Tracking Area (TA). In addition, in PA optimization, the PA size is set to be fixed and can be set commonly for a corresponding base station or cell or a terminal belonging to a network through a base station broadcast. We propose an operation that optimizes setting by reflecting the individual characteristics of the terminal.

PA optimization, that is, the PA size determination criterion may be determined by the following factors.

1) UE Mobility: The PA size may be set differently according to the speed at which the UE moves. Terminal mobility may be defined as the absolute speed of the terminal. Alternatively, it may be the number of handovers per reference time or the number of PA updates per reference time. In this case, in order to avoid duplication, only handover or PA update for a new base station/cell may be limited to be effective. The mobility of the UE may be defined as a new parameter (ex. timeMobility…) or calculated using an existing field value. For example, the time spent in a recently visited cell can be known with the timeSpent value in VarMobilityHistoryReport defined as a UE variable. By accumulating this value, a new field can be defined for the time spent in a specific number of cells (ex. timeSpent16) …). The information can be continuously tracked and processed by the terminal itself even when the connection with the base station is cut off.

2) UE traffic pattern: The PA size may be set differently according to the traffic pattern of the UE. Specifically, the terminal traffic pattern may be defined as an average inter-arrival time within the reference time, and may also be considered as the ratio of the inactive state operation time within the reference time of the terminal. In this case, the reference time may be fixed, but may be variably changed according to a terminal or network condition. The terminal traffic pattern information may be defined as a new parameter or calculated using an existing field value. Corresponding information can be tracked by the terminal, but can be identified and processed by a connected base station/cell or anchor base station/cell.

3) Network loading: The PA size may be set differently according to the network load. The network unit may be a cell or a base station, or a RAN notification area including a TA or PA, and the network load may be a size or ratio of a downlink transmission data load or a paging load for each network. This can be defined as a new parameter or calculated using an existing field value.

The PA size determination criteria elements are determined by a base station or a terminal, and may be transmitted to a network including a PA allocation base station or an MME as information for PA optimization design. In this case, the network may request the terminal first, and in this case, the terminal may share the corresponding information with the network in the form of a response. Alternatively, a terminal in a connected or inactive state may share a corresponding content for a specific event. Alternatively, when the terminal in the idle state transitions to the connected state for data transmission/reception, the corresponding content may be transmitted to the network.

Next, the PA optimization procedure according to the PA optimization time will be described. 1) First, the optimization procedure at the time of the PA Update procedure due to the PA change is described [Fig. 2c]. The PA change occurs when the UE moves out of the existing PA and allocates a new PA. In this case, the following options are possible for the UE to perform PA Update.

1-1) The first option is when the terminal transitions to the Connected state, establishes a connection with the base station, and performs PA Update. 1-1-1) At this time, the above-mentioned PA optimization selection element, Mobility information and/or Traffic Pattern information and/or Mobility information and Traffic Pattern merged information of the UE are shared uplink. Data required for uplink transmission may be included in the RRC connection (resume) request message and/or included in the RRC connection resume complete message and/or transmitted in the form of a response to a request from the base station. 1-1-2) Alternatively, the mobility information tracked by the terminal is shared uplink, and the traffic pattern information can be received from the anchor cell or camped cell of the previous TA. Mobility information requiring uplink sharing is included in the RRC connection (resume) request message and/or included in the RRC connection resume complete message in the above-mentioned manner and/or in the form of a response to a request from the base station can be transmitted to Traffic pattern information can be received in the form of a response by requesting the Anchor Cell or Camped Cells of the previous TA. Alternatively, it can be requested only from the Anchor Cell of the previous TA. For this purpose, data traffic information (transmission/reception frequency, etc.) transmitted and received while the terminal is camping in the cell, not the anchor cell, is processed in the Camped Cells and delivered to the anchor cell. . In this case, the delivery time may be periodic, or may be triggered when the terminal leaves the Camped Cells. In order to grasp long-term information, the traffic pattern information of the terminal identified by the anchor cell of the past TA may also be accumulated. Accordingly, the anchor cell of the new PA may request traffic pattern information of the terminal only from the anchor cell of the previous PA and receive it in the form of a response.

1-2) The second option may include a case in which the PA update is performed while the UE maintains an inactive state. For this option, it is assumed that the UE can support data transmission/reception in the inactive state. When a PA change occurs and the UE performs PA Update, the UE performs PA Update without transitioning to the Connected state. 1-2-1) At this time, the above-mentioned PA optimization selection element, Mobility information and/or Traffic Pattern information and/or information obtained by merging Mobility information and Traffic Pattern of the UE, is shared uplink in the inactive state. Data required for uplink transmission may be transmitted while being included in the PA Update message. Alternatively, data required for uplink transmission may be included in the RRC connection (resume) request message and/or included in the RRC connection resume complete message and/or transmitted in the form of a response to the request of the base station. . 1-2-2) Alternatively, the mobility information tracked by the terminal is shared uplink, and the traffic pattern information can be received from the anchor cell or camped cell of the previous TA. The necessary mobility information shared in the uplink is included in the RRC connection (resume) request message and/or included in the RRC connection resume complete message in the inactive state in the above-mentioned manner and/or in response to the request of the base station ( Response) can be transmitted. Traffic pattern information can be received in the form of a response by requesting the Anchor Cell or Camped Cells of the previous TA. Alternatively, it can be requested only from the Anchor Cell of the previous TA. For this purpose, data traffic information (transmission/reception frequency, etc.) transmitted and received while the terminal is camping in the cell, not the anchor cell, is processed in the Camped Cells and delivered to the anchor cell. . In this case, the delivery time may be periodic, or may be triggered when the terminal leaves the Camped Cells. In order to grasp long-term information, the traffic pattern information of the terminal identified by the anchor cell of the past TA may also be accumulated. Accordingly, the anchor cell of the new PA may request traffic pattern information of the terminal only from the anchor cell of the previous PA and receive it in the form of a response.

Next, a case in which an optimization procedure is induced in the PA is described [Fig. 2d]. While the terminal belongs to the existing PA, the PA optimization procedure may be performed by a specific terminal event or a base station event. This procedure can be performed under the assumption that the terminal can transmit and receive data in an inactive state. When the terminal cannot transmit and receive data in the inactive state, it is limitedly applicable to the case where the terminal transitions to the connected state.

1) The UE transmits a PA optimization request first, so that the optimization procedure can be performed. In this case, related terminal-related information for the above-mentioned optimized PA determination may be transmitted together with the request or before and after the request. That is, when the following event occurs, the terminal may transmit information for determining PA optimization together with the PA optimization request, or may receive the corresponding information in the form of a response to the request of the base station that has received the PA optimization request. The UE may transmit a PA optimization request for the following situations.

1-1) A request can be transmitted according to a periodic event. For this option, a UE operation timer for the PA optimization request may be newly defined or an existing timer may be used. 1-2) When the mobility pattern of the terminal changes, the PA optimization request may be triggered. For example, it can be triggered when the absolute speed of the terminal is changed above or below a specific limit, or when the number of handovers to the base station/cell or the number of PA updates within the reference time increases or decreases by a specific number and/or a specific ratio. . 1-3) or when the traffic pattern of the terminal changes, the PA optimization request may be triggered. For example, it may be triggered when the average inter-arrival time within the reference time or the time ratio operating in the inactive state that the terminal understands increases or decreases by a specific time size and/or a specific ratio. 1-4) It can also be triggered when factors affecting the state change of the terminal are changed, such as terminal configuration information, for example, the size of the inactivity timer of the terminal is changed.

2) The network may first optimize the PA and transmit the corresponding information to the UE. The network refers to a network entity such as a base station or an MME. When an event occurs, the base station may request information for determining PA optimization from the terminal in advance, and the terminal may transmit the information in the form of a response to the request of the base station.

2-1) For this option, the network may periodically update the PA of the terminal. To this end, an operation timer may be newly defined in the base station or network, or an existing timer may be used. 2-2) A PA optimization procedure may be performed for a specific event occurring in a network unit. For example, an event may occur when the amount and/or ratio of paging load in the current PA is changed above or below a specific threshold, or when the amount and/or ratio of downlink data load of the base station is changed above or below a specific threshold. have. Alternatively, the corresponding event may occur according to the active time ratio of the network. 2-3) When the terminal configuration information is changed from the network, PA optimization can be performed even when factors affecting the state change of the terminal are changed, for example, the size of the inactivity timer of the terminal is changed. 2-4) The UE may transmit information for determining PA optimization to the network when transitioning to the connected state. When the network determines that PA optimization is necessary based on the information, this may be performed.

With respect to the operations 1) and 2), the PA optimization procedure in the case where the cell in which the terminal is currently camped is not the anchor cell is described as follows.

1) Existing Anchor Cell decides everything and Camped Cell can only relaying.

Regarding the operation of option 1), that is, when a PA optimization request is transmitted from the terminal, the following operation is performed.

- Step 1: Transmits a PA optimization request to the Camped Cell according to the occurrence of events 1-1) to 1-4) of the terminal. In this case, information of the terminal necessary for the PA optimization decision may be transmitted together with the request. In this case, the following two steps can be omitted.

- Step 2: Upon receiving the PA optimization request from the terminal, the Camped Cell requests the necessary information from the terminal and receives it in the form of a response.

- Step 3: The Camped Cell transmits the PA optimization request of the UE to the Anchor Cell. In this case, the terminal information received in step 1 or step 2 may be transmitted together.

- Step 4: Anchor Cell additionally collects information for PA optimization decision based on the requesting terminal information and network information. At this time, in addition to the current Camped Cell, the terminal may request terminal-related information from the previously camped Cells and receive it in the form of a response. Alternatively, terminal information necessary for PA optimization may be requested from an upper network entity and received.

- Step 5: Anchor Cell performs optimal PA decision based on the received terminal operation. In this case, the decision operation may be directly performed or a request may be made to the network including the MME. The optimally determined PA of the terminal may be processed in the form of a list. If there is no change, resource waste may occur in transmitting the list, so a field for whether or not there is a change may be set and transmitted.

- Step 6: The optimally determined PA information is transmitted to the requested current Camped Cell again. If there is no PA change, it can be transmitted in advance by marking the field containing the relevant information.

- Step 7: The Camped Cell transmits PA change information and/or PA change information received from the Anchor Cell to the terminal. Upon receiving this, the terminal deletes the previous PA list information and updates it with the newly received information.

Regarding the operation of option 2) above, that is, when a PA change is requested from the network, the following operation is performed.

- Step 1: Step 1 - Option 1) Event 2-1) ~ 2-4) When this occurs in the Camped Cell, Step 1 - Option 1-1) The Camped Cell provides information to determine PA optimization in advance may request, and the terminal may transmit the corresponding information in the form of a response to the request of the base station. The Camped Cell can transmit the information together while sending the PA optimization request to the Anchor Cell. Step 1-Option 1-2) The Camped Cell transmits a PA optimization request to the Anchor Cell according to the occurrence of the above event. At this time, the terminal information possessed by the Camped Cell may be transmitted to the Anchor Cell together without a request from the terminal. If the anchor cell requires additional terminal information for PA optimization determination, it may request the terminal through the camped cell and receive it in the form of a response. Alternatively, terminal information necessary for PA optimization may be requested from an upper network entity and received. Step 1 - Option 2) If events 2-1) ~ 2-4) occur in the anchor cell, information for determining PA optimization can be requested from the terminal through the camped cell, and the terminal responds to the request of the base station The information can be transmitted in the form of a response. Alternatively, terminal information necessary for PA optimization may be requested from an upper network entity and received. Step 1 - Option 3) If events 2-1) ~ 2-4) occur in a network entity higher than the base station, a PA optimization command is transmitted to the anchor cell. In this case, network information related to PA optimization may be transmitted together. For example, when the maximum PA size is changed, the corresponding information may be transmitted together.

- Step 2: Anchor Cell performs PA optimization decision based on the received terminal information and network information. At this time, in addition to the current Camped Cell, the terminal may request terminal-related information from the previously camped Cells and receive it in the form of a response. Anchor Cell may request the network including the MME for PA optimization. The optimally determined PA of the terminal may be processed in the form of a list. If the PA optimization decision is the same as the previous PA and there are no changes, the above procedure is terminated.

- Step 3: Anchor Cell transmits PA changes determined as a result of Step 2 to the current Camped Cell.

- Step 4: The Camped Cell transmits the PA change information received from the Anchor Cell to the UE. Upon receiving this, the terminal deletes the previous PA list information and updates it with the newly received information.

2) The new Camped Cell can optimize and set the new PA, and notify the changed PA information to the Anchor Cell and the terminal.

Regarding the operation of option 1), that is, when a PA optimization request is transmitted from the terminal, the following operation is performed.

- Step 1: Transmits a PA optimization request to the Camped Cell according to the occurrence of events 1-1) to 1-4) of the terminal. In this case, information of the terminal necessary for the PA optimization decision may be transmitted together with the request. In this case, the following two steps can be omitted.

- Step 2: Upon receiving the PA optimization request from the terminal, the Camped Cell requests the necessary information from the terminal and receives it in the form of a response.

- Step 3: Camped Cell additionally collects information for PA optimization decision based on the information of the requesting terminal and network information. In this case, the terminal-related information may be requested from the anchor cell or from the previously camped cells and received in the form of a response. Alternatively, terminal information necessary for PA optimization may be requested from an upper network entity and received.

- Step 4: The Camped Cell performs the optimal PA decision based on the received terminal information. The optimally determined PA of the terminal may be processed in the form of a list. If there is no change, resource waste may occur in transmitting the list, so a field for whether or not there is a change may be set and transmitted.

- Step 5: The finally determined PA change information and/or PA change information is transmitted to the terminal. Upon receiving this, the terminal deletes the previous PA list information and updates it with the newly received information. At the same time, the decision information is transmitted to the anchor cell. Anchor Cell updates the information and refers to it when paging later. Anchor Cell may deliver the corresponding information to the MME.

Regarding the operation of option 2) above, that is, when a PA change is requested from the network, the following operation is performed.

- Step 1: Step 1 - Option 1) Event 2-1) ~ 2-4) When this occurs in the Camped Cell, the Camped Cell may request information for determining PA optimization from the terminal, and the terminal may request information from the base station The information can be transmitted in the form of a response to Alternatively, the Camped Cell may receive information for determining PA optimization in the form of a response by requesting the Anchor Cell or Cells that the UE has previously camped for. Alternatively, terminal information necessary for PA optimization may be requested from an upper network entity and received. Step 1 - Option 2) If Event 2-1) ~ 2-4) occurs in Anchor Cell, transmit PA optimization request/command to Camped Cell. In this case, terminal information necessary for PA optimization may be transmitted together. Alternatively, the Camped Cell that has received the PA optimization request/command may request the corresponding information from the Anchor Cell and receive it in the form of a response. Alternatively, the Camped Cell may receive information for determining PA optimization in the form of a response by requesting the information for determining the PA optimization to the Cells that the terminal has previously camped. Alternatively, terminal information necessary for PA optimization may be requested from an upper network entity and received. Step 1 - Option 3) If events 2-1) ~ 2-4) occur in a network entity higher than the base station, a PA optimization command is transmitted to the Camped Cell. In this case, network information related to PA optimization may be transmitted together. For example, when the maximum PA size is changed, the corresponding information may be transmitted together. The Camped Cell may, if necessary, request information for determining PA optimization from the Anchor Cell or the cell that the terminal was previously camped for and may receive it in the form of a response.

- Step 2: The Camped Cell performs a PA optimization decision based on the received terminal information and network information. The optimally determined PA of the terminal may be processed in the form of a list. If the PA optimization decision is the same as the previous PA and there are no changes, the above procedure is terminated.

- Step 3: The Camped Cell transmits the finally determined PA change information to the terminal. Upon receiving this, the terminal deletes the previous PA list information and updates it with the newly received information. At the same time, the decision information is transmitted to the anchor cell. Anchor Cell updates the information and refers to it when paging later. Anchor Cell may deliver the corresponding information to the MME.

3) The new Camped Cell can be set to be changed to a new Anchor Cell, the new Anchor Cell can optimize the PA, and the changed PA information can be notified to the UE and the previous Anchor Cell.

Regarding the operation of option 1), that is, when a PA optimization request is transmitted from the terminal, the following operation is performed.

- Step 1: Change and set the Anchor Cell of the terminal. This operation proceeds according to the PA optimization request of the terminal. Upon receiving the PA optimization request, the Camped Cell transmits an Anchor Cell change request to the Anchor Cell. Upon receiving this, the Anchor Cell delivers the terminal context information it had to the Camped Cell. In addition, it informs the upper network entities including the MME of the change to establish a new S1 connection with the existing Camped Cell. At this time, the ID information of the existing Camped Cell is delivered together with the change, and the Anchor Cell can relaying the message required when establishing the S1 connection between the MME and the Camped Cell.

- Step 2: New Anchor Cell collects necessary information before proceeding with PA optimization changes. Before step 1, the UE may transmit information necessary for determining PA optimization together when requesting PA optimization. Alternatively, necessary information may be requested from the terminal in this step. Alternatively, the terminal may request the corresponding information from the previously camped Cells and receive it in the form of a response. Alternatively, it can request the corresponding information from the upper network entity and receive it in the form of a response.

- Step 3: The new anchor cell determines the optimal PA based on the collected terminal information. The optimally determined PA of the terminal may be processed in the form of a list. If there is no change, resource waste may occur in transmitting the list, so a field for whether or not there is a change may be set and transmitted.

- Step 4: Transmits the finally determined PA change information and/or PA change information to the terminal. Upon receiving this, the terminal deletes the previous PA list information and updates it with the newly received information. At the same time, X2 and S1 are transmitted to the previous anchor cell and MME of the decision information.

Regarding the operation of option 2) above, that is, when a PA change is requested from the network, the following operation is performed.

- Step 1: Step 1 - Option 1) In case of occurrence in Camped Cell, Camped Cell sends Anchor Cell change request to Anchor Cell. Upon receiving this, the Anchor Cell delivers the terminal context information it had to the Camped Cell. In addition, it informs the upper network entities including the MME of the change to establish a new S1 connection with the existing Camped Cell. At this time, the ID information of the existing Camped Cell is delivered together with the change, and the Anchor Cell can relaying the message required when establishing the S1 connection between the MME and the Camped Cell. Step 1 - Option 2) In case of occurrence in Anchor Cell, Anchor Cell sends Anchor Cell change request to Camped Cell. In addition, the Anchor Cell delivers the terminal context information it had to the Camped Cell. In addition, it informs the upper network entities including the MME of the change to establish a new S1 connection with the existing Camped Cell. At this time, the ID information of the existing Camped Cell is delivered together with the change, and the Anchor Cell can relaying the message required when establishing the S1 connection between the MME and the Camped Cell. Step 1 - Option 3) In case of occurrence in a network entity higher than the base station, the Anchor Cell change request is transmitted to the Camped Cell through the Anchor Cell. Upon receiving this, the Anchor Cell delivers the terminal context information it had to the Camped Cell. In addition, it informs the upper network entities including the MME of the change to establish a new S1 connection with the existing Camped Cell. At this time, the ID information of the existing Camped Cell is delivered together with the change, and the Anchor Cell can relaying the message required when establishing the S1 connection between the MME and the Camped Cell.

- Step 2: New Anchor Cell collects necessary information before proceeding with PA optimization changes. In this case, it is possible to request necessary information from the terminal and receive it in the form of a response. Alternatively, the existing anchor cell or the terminal may request the corresponding information from the previously camped cells and receive it in the form of a response. Alternatively, it can request the corresponding information from the upper network entity and receive it in the form of a response. With respect to step 1 - option 2), the corresponding information can be received from the existing anchor cell together with the request to change the anchor cell. With respect to step 1 - option 3), it is possible to receive related terminal and network information together with an anchor cell change request.

- Step 3: The new anchor cell determines the optimal PA based on the collected terminal information. The optimally determined PA of the terminal may be processed in the form of a list. If the PA optimization decision is the same as the previous PA and there are no changes, the above procedure is terminated.

- Step 4: Transmits the finally determined PA change information to the terminal. Upon receiving this, the terminal deletes the previous PA list information and updates it with the newly received information. At the same time, X2 and S1 are transmitted to the previous anchor cell and MME of the decision information.

There are the following options for maintaining/changing the relationship between the network and the anchor cell when transmitting and receiving DL/UL data in the inactive state.

1) Relationship maintenance plan Option 1: Maintain Anchor Cell. The terminal's new Camped Cell is simple relaying

2) Relationship maintenance plan Option 2: Maintain Anchor Cell. The terminal's new Camped Cell collects and relays the terminal context from the anchor cell.

3) Relationship change plan: Change Anchor Cell to New Camped Cell

<Third embodiment>

The present invention proposes an overall HO procedure and method including RRM measurement, HO triggering condition, measurement report, and HO determination in a 5G New Radio-based mobile communication system. In particular, consider measurement and reporting, HO triggering and determination by numerology in consideration of base stations supporting one or more numerology. Various services (or slices) such as enhanced Mobile BroadBand (eMBB), Ultra Reliable and Low Latency Communication (URLLC), and enhanced Machine Type Communication (eMTC) are expected to be supported in the 5G mobile communication system. This can be understood in the same context that the 4G mobile communication system, LTE, supports voice-specific services such as VoIP (Voice over Internet Protocol) and BE (Best Effort) services. In addition, it is expected that various numerologies will be supported in the 5G mobile communication system. This specifically means subcarrier spacing, etc., which directly affects the Transmission Time Interval (TTI). Therefore, it is expected that TTI of various lengths will be supported in the 5G mobile communication system. This can be seen as one of the characteristics of the 5G mobile communication system, which is very different from the support of only one type of TTI (1 ms) in LTE standardized so far. If the 5G mobile communication system supports a much shorter TTI (eg 0.1 ms) than the 1 ms TTI of LTE, it is expected to be of great help in supporting URLLC that requires a short delay time. Note that in this document, numerology is used as a generic term for subcarrier spacing, subframe/slot length, symbol/sequence/CP length, subcarrier spacing, operating BW, reference signal type, etc. In addition, according to context, numerology also refers to related transmit time interval (TTI), BW (band), MCS, and transmit power information. The base station may be represented for various abbreviations such as gNB, eNB, NB, BS, and the communication area provided by the base station is called a Cell. Cells become smaller in the order of macro cell, pico cell, and femto cell according to the size of the area. The terminal may be represented for various abbreviations such as UE, MS, and STA.

In order to support the mobility of the terminal in the existing mobile communication system including LTE, a handover (HO) procedure is defined. When the UE receives a paging message from the network or wants to send data through uplink (UL), it switches from the RRC_IDLE state to the RRC_CONNECTED state and performs an operation equivalent to the CONNECTED mode UE. The base station prepares the CONNECTED mode UE for HO, that is, configures for measurement and report. Since the UE continues to monitor the cell quality (base station quality) of the serving cell in the CONNECTED state, the base station instructs the UE to measure and report channels for neighboring base stations with an RRC connection reconfiguration message. The RRC connection reconfiguration message includes at least one of a measurement configuration, a report configuration, a neighbor cell list (neighbor cell list), and a measurement and/or report target frequency carrier. In the neighbor cell list, the neighbor base station is indicated by PCI (Physical Cell ID). The UE performs base station quality measurement for neighboring base stations according to the RRC connection reconfiguration message. Since the base station informs the measurement object for one carrier in the measurement configuration, the terminal performs synchronization signal (PSS/SSS) reception on the carrier and when PCI included in the neighbor cell list is obtained, the synchronization signal corresponding to the PCI is displayed. BW information is acquired through a decodable PBCH (Physical Broadcast Channel). Since LTE can know the CRS (Cell-specific RS) structure and location for the base station from BW information and cell ID, that is, PCI, the UE can receive the CRS and measure the base station quality (RSRP, RSRQ). The measured base station quality value is obtained for one base station every 40 ms, and the obtained base station quality value within 200 ms is averaged and reported as a measurement report procedure. The base station makes the HO decision based on the measurement report of the terminal. As shown in Figure 3a, the first base station (gNB1), which has made a decision to HO the terminal to the second base station, directly or through a gateway through a network interface such as X2, S1, or Xn to the second base station (gNB2) causes HO , send a HO request message including target cell ID, GUMMEI ID, and UE context information. Base station 2 sends a HO response message to base station 1 in response to this. Upon receiving the HO response message, the first base station instructs the terminal to move the connection to the target cell, that is, the second base station through RRC connection reconfiguration. The UE performs an RA procedure starting from random access (RA) preamble transmission in order to obtain uplink synchronization with base station 2 . When the UE acquires uplink synchronization, that is, Timing Advanced (TA) and UL resources as an RA response, it sends an RRC connection reconfiguration complete message to terminate the HO procedure.

According to the physical layer design of the 5G New Radio-based mobile communication system, different numerologies are operated in the FDM method as shown in Figs. 3b or 3c in the frequency band operated by one base station, or different numerologies are implemented in the TDM method as shown in Fig. 3d. can operate. The structure of the control channel shown in dark color is also different for each numerology. According to the FDM method, frequency resources are divided and operated with different numerology, but the synchronization signal (SS) can be operated with numerology 0, which is the default numerology. If there is no separate setting, the Default Numerology is determined in advance per carrier and is regarded as a value that the terminal has in advance. Since the location of the center frequency of one carrier is determined in the standard, the UE may perform a scanning operation for receiving a synchronization signal for a location of a carrier within a predetermined range. When a synchronization signal is received with a certain quality or higher on a certain carrier, the terminal may receive the PBCH to obtain system information (SI). That is, the UE may perform idle mode operations such as synchronization signal, PBCH, SI, and paging based on the default numerology. Since the PRACH setting is an uplink (UL) signal, it is possible to set a separate numerology for PRACH in the SI. According to the embodiment, other numerology additionally set for the service, for example, a resource (frequency offset, used band, number of RB (Resource Block)) for at least one numerology among Numerology 1 and 2, and a reference signal (Reference Signal - RS) information can be 1) obtained by receiving SI in the structure shown in FIG. 3b, or 2) can be obtained through an RRC message after establishing a connection based on Numerology 0 in the structure shown in FIG. 3c. Numerology 0 in the present invention is also called basic numerology, and is a numerology that can be obtained by receiving a synchronization signal (SS) and a broadcast channel (PBCH). It may be determined according to predetermined information, or may be set by the base station as System Information (SI) in the PBCH. The UE receives the Numerology required for transmission and reception of control and data channels explicitly or implicitly from the eNB through the RRC Connection Setup procedure. The base station may set a numerology other than Numerology 0 (default/Default) 1) together with the subband/band part configuration in which the terminal operates, or 2) together with the CSI-RS configuration of the terminal. When it is set to a partial band, the configuration of the CSI-RS and other signals in the set partial band follows the set Numerology. The base station may also include Numerology 0 (basic) when configuring the partial band or CSI-RS. According to an embodiment, unless there is a separate explicit setting, the control channel/data channel transmission/reception may be performed with the same settings as the band and numerology used for reception of the synchronization signal and PBCH.

In the structure shown in FIGS. 3B and 3C , according to an embodiment, the network may transmit the SS at a frequency other than the center frequency among the entire band. This is used because the synchronization performance for a wide band cannot be guaranteed with only the SS transmitting at the center frequency in the ultra-wideband. When the SS is transmitted at another frequency, the Sync offset for the center frequency may be transmitted with the SS sequence or the PBCH transmitted together. When notifying the sync offset, you can add a field that informs the state of the target whether it is the center of the entire BW or not. This field may be substantially the same as information on whether the SS received by the UE is the center. The UE may determine whether to continue to observe the currently received Non-center Sync Signal (SS) or to move and observe the non-center Sync Signal (SS) to the Center SS based on whether the center of the transferable SS candidate signal. For example, the resource set by the serving base station A terminal operating in , receives the non-center SS of the neighboring base station, determines the location of the center SS of the neighboring base station, and can observe the center SS of the neighboring base station for RRM measurement if necessary.

On the other hand, in the case of operating in TDM as shown in FIG. 3D , the terminal additionally sets other dedicated numerology for service after acquiring a synchronization signal, for example, a resource (time offset, use band) for at least one numerology among Numerology 1 to N. , RB (Resource Block) location and number) and reference signal (Reference Signal - RS) information is obtained by 1) receiving SI, or 2) RRC after establishing a connection based on at least one numerology among Dedicated Numerology 1 to N. It can be acquired through a message or a message (RRC or MAC) exchanged during the random access process. In order to support the operation as in 2) above, a) the relationship between Default Numerology 0 and Dedicated Numerology is determined in advance, or b) SI informs the It is possible to reduce the overhead of the RRC message. In the case of a), it can be specified that the terminal uses the same numerology as the basic numerology 0 used for the synchronization signal/PBCH with numerology 1.

Meanwhile, according to an embodiment, the network may support communication of the terminal with a specific numerology set for a service/slice subscribed to by the terminal. For example, a terminal subscribed to the eMBB service may communicate with the network through Numerology 0 or 1, and a terminal subscribed to the URLLC service may communicate with the network through Numerology 1 or 2. However, since a one-to-one relationship between a service and numerology is not determined, the network may inform the numerology set used by the network to support a specific service/slice when establishing a connection of the terminal or by using an SI message.

The 5G NR communication system and network should support various services in various deployment environments. A mobile communication operator provides a number of services, including services A and B, to its subscribers or to subscribers of a VPN (Virtual Private Network) or slicing operator. , and the amount of available resources, in reality, the types of services currently provided by each base station may be different. When a mobile operator's network is leased to a third party, such as VPN, the number, location, and communication area required for base stations may vary depending on the type of service. Therefore, mobile communication service providers require communication technology that enables flexible deployment.

In a network where the numerology of service and operation dynamically changes like this, RRM measurement and HO procedure of the terminal are important technologies to evaluate its performance. RRM Measurement is mainly performed to measure the Cell Quality of the neighboring base station (Neighboring Cell) and report the measurement value (Measurement Quantity) to the serving base station (Serving Cell). However, when measuring the base station to which service A and service B are provided simultaneously, the terminal receiving service A receives the measurement values for Numerology and RS for service A and the measurement values for Numerology and RS for service B. If it cannot be distinguished, the terminal has no choice but to report the measurement values for all RSs of the base station regardless of the service. According to this procedure, for the terminal, although the overall quality of a specific base station is good, the quality of partial resources for a service used may not be good. Alternatively, the overall quality of the base station and the reception quality of the partial resources for each service may be different due to a difference in the transmission power of the base station with respect to the partial resource for the service to be used. Alternatively, even if the overall quality of a specific base station and the quality of partial resources for each service used are similar, there must be a difference in the quality value set by the terminal for measurement report or HO determination according to differences in network facilities and services provided by base station do. Alternatively, even if the requirements for mobility for each service are the same, the accuracy of the measurement value for RS according to different numerology for each service may be different. In addition, when the difference between the measurement quality for Default Numerology and the Measurement Quality for Dedicated Numerology is large, the UE must report it separately. Alternatively, if there is a large difference between the measurement quality for Default Numerology that can be grasped by SS reception of the base station and the measurement quality for Dedicated Numerology that can be grasped by CSI-RS reception, the UE must report it separately. Alternatively, since there may be a large difference between the measurement quality that can be recognized by the SS reception of the base station and the measurement quality that can be understood by the CSI-RS reception, the UE must report it separately.

In addition, there may be a limitation in measuring the quality of a neighboring base station while communicating with the serving base station according to the capability of the terminal or the limitation of the transmission/reception operation. That is, the terminal takes a certain amount of time delay to switch from one numerology to another or has to switch numerology and measure it at a time not used in the numerology being communicated with. For example, a terminal communicating with a serving base station using Numerology 0 resources can easily measure Numerology 0 resources operated by neighboring base stations in the same frequency band, whereas Numerology 1 resources operated by neighboring base stations are in communication with the serving base station. Since measurement is possible only when there is a spare, it can be seen that the measurement result for the Numerology 0 resource is more accurate based on more samples. On the other hand, it may be possible to combine and average the measurement results for the Numerology 0 resource and the Numerology 1 resource. However, if the linear average is taken as before, the result with a smaller number of samples may be reflected in the overall result.

According to some scenario, the network may inform the terminal of a list of base stations that the terminal wants or supports the service/slice configured for the terminal. Alternatively, when the UE performs Tracking Area Update (TAU) for paging, if a list of services/slice available within the TAU area is required, the network may inform the UE in association with a carrier frequency, RAT, and cell. This information is called slice availability and informs the terminal of service/slice information that can be supported in one mobile communication network. However, when measuring for HO, it may be difficult to separately measure and report numerology changes due to dynamic service/slice changes using only the static slice availability information.

According to some scenarios, the HO requirements for each service/slice of the UE may be different. In this case, unnecessary reporting can be reduced by making the reporting period different instead of applying the same to one base station. For example, the cycle of measurement report for mMTC may be longer than the cycle of measurement report for URLLC. This period may be set in the terminal by the base station, but in the event-based case, since it is a result according to the triggering condition, control variables (timer, hysteresis margin, etc.) used for event determination must be set differently for each service/slice or numerology.

Interference in a radio channel affects a measure of base station quality. That is, if the received power value of the desired signal from the base station is the same, a low base station quality value is obtained in an environment with high interference, and a high base station quality value is obtained in an environment with low interference. A terminal that receives and operates with a specific numerology is not detected unless it is a signal transmitted with the same numerology, so it is reflected as interference. For example, when terminal 1 operating as numerology 1 with base station 1 as a serving base station receives and measures the signals from base station 2 operating in numerology 1 and base station 3 operating in numerology 2, for base station 2, signal strength / A quality measure is obtained, but no signal strength/quality measure is obtained for base station3. On the other hand, in the same environment, when terminal 2 operating as Numerology 2 with base station 1 as a serving base station receives and measures the signals of base station 2 operating as Numerology 1 and base station 3 operating as Numerology 2, signal strength for base station 3 /Quality measurements are obtained, but no signal strength/quality measurements are obtained for base station 2. However, if it is assumed that the base station closest to the base station 1 is actually the base station 2, although terminal 1 can properly HO to the base station 2, the terminal 2 cannot HO to the nearby base station 2 and the failure probability is high or a delay may occur. HO is done. In this case, the base station 1 should inform the terminal 2 of the RRM measurement resource for the base station 2 and Numerology 2 information used in order to obtain an accurate signal strength/quality measurement value for the base station 2 of the terminal 2 . Alternatively, one or more RRM measurement resources and numerology information to be used for observing serving and neighboring base stations to UE2 should be able to be configured as needed.

Therefore, in order to solve the various problems raised above, it is also necessary to measure partial resources for each service, ie, service-specific or numerology-specific resources, to be numerology-specific. In L1 (Layer 1, physical layer), since services are not recognized and only numerology is distinguished, terms such as numerology-specific measurement, numerology-specific triggering condition, and numerology-specific measurement quantity will be used in the measurement procedure. In contrast, the existing LTE can be viewed as carrier-specific measurement, carrier-specific triggering condition, and carrier-specific measurement quantity. In the present invention, according to an embodiment, the RRM measurement procedure may be performed as a combination of each of the above-described procedures, either carrier-specific or numerology-specific.

On the other hand, the validity period of the RRM measurement resource and numerology information may be set together by the base station. The terminal operates by trusting this information within the validity period, and when the validity period has passed, the terminal may ignore the measurement and report or request a reset from the base station. As another embodiment, the RRM measurement resource and numerology information may be requested to be set/reconfigured by the base station, and the terminal may set the RRM measurement resource and numerology information according to the configuration or reset request of the base station.

In the present invention, the base station quality can be expressed in RSRP, RSRQ, SINR, SE (Spectral Efficiency), and the like. When Numerology-specific information is transmitted as SI, it may be transmitted as Other SI instead of Minimum SI. According to the on-demand SI procedure, the base station may receive the SI request information of the UE (transmitted as Message 1 (RA preamble) or Message 3 of the random access procedure) and transmit the Numerology-specific SI corresponding to the request. According to the type of procedure, the information transmitted from the on-demand SI may include SS or CSI-RS information for RRM measurement, that is, RS type, transmission resource (period, band, offset), and numerology.

<Measurement Framework>

Here, the Measurement Framework among the entire RRM Measurement procedure of the present invention will be described.

As shown in FIG. 3F, the Measurement Framework of the existing LTE communication system binds one Measurement Object (measurement target) and one Reporting Configuration (report configuration) into one Measurement ID. Measurement ID is a standard for triggering and measurement report for the UE's measurement report. Measurement Object includes information such as carrier frequency location (f0, f1, etc.) and system type (LTE, WCDMA, etc.). Reporting Configuration includes variables (offset, threshold) related to event types and conditions used for triggering. According to the LTE Measurement Framework, multiple events are bundled for one carrier so that relatively free measurement settings are possible, and they can be managed with different Measurement IDs.

On the other hand, in 5G NR, the measurement framework considering measurement resources for each numerology can consider various methods as follows.

Method 1) Reflect the measurement result in the measurement object and triggering condition according to the measurement resource setting for one numerology set for one carrier

Method 2) For the measurement object set for one carrier, the measurement results are stored separately for at least one numerology used by the terminal for measurement, and reflected in the triggering condition for one numerology

Method 3) One measurement object set for one carrier and the measurement result for at least one sub-object are reflected in the triggering condition

Method 4) Reflecting the measurement result for the measurement object set for at least one resource area for each numerology set for one carrier in the triggering condition

According to method 1, it is possible to operate without changing the existing measurement framework. For example, if the serving base station sets the numerology for RRM measurement to the UE as a Layer1 (L1, physical layer) signal, as a MAC message, or as an RRC message, and informs the UE of the location (time/frequency) and RS type of the resource to be observed The UE may reflect the results measured in the set measurement period and resources in the calculation of the triggering condition for each measurement object. The problem of method 1 is that since the UE does not have information on which time/frequency resource the neighboring base station will operate in which numerology, the UE sends all measurement objects within the RRM measurement resource set with the L1 signal, MAC message, or RRC message. measurement should be attempted. In addition, the neighbor base station quality value, which is measured differently according to the set numerology of the terminal, needs to be updated for one measurement object, which causes reduction in measurement accuracy. Therefore, Method 1 may be useful when a common resource having the same numerology is set between the serving base station and the neighboring base station.

According to method 2, operation is possible without significantly changing the existing measurement framework. For example, when the UE receives the Measurement Gap or RRM Measurement resource set, the UE performs measurement with one of Numerology currently used or Numerology Set linked to service/slice. The UE separates and stores the base station quality value for the measurement object for each numerology used for measurement. In general, the L1 sample value measured every 40 ms is weighted averaged during the L3 filtering process and reported once every 200 ms. If it is left to the terminal implementation, the L1 sample values measured every 40 ms are also stored separately for each numerology and weighted average is performed during the L3 filtering process. However, if it is left to the terminal implementation, the values separated by numerology are averaged during L3 filtering, so the influence of different interference by numerology disappears. On the other hand, when L3 filtering for each numerology is introduced, the terminal manages the base station quality for each numerology at L3 for one measurement object, and reports one representative base station quality value for the target base station when the triggering condition is satisfied. A method of obtaining a representative base station quality value from base station quality for each numerology will be described in detail later.

According to method 3, the serving base station informs the location of partial resources (time/frequency) and the numerology to be measured as well as the carrier of the measurement object when setting the settings for measurement and report with the RRC connection reconfiguration message. The measurement resource may be cell-specific, RS-specific, UE group-specific, UE-specific, BW-specific or Numerology-specific. To this end, as shown in FIG. 3G , a measurement sub-object may be introduced to bind partial resource locations (offset, BW, etc.) and numerology information to be set. Measurement sub-object can be bound to the same Reporting Configuration as Measurement Object. Therefore, the base station quality value measured for the measurement sub-object is reflected in the triggering condition along with the base station quality value measured for the measurement object. How to reflect on the triggering condition based on the measurement value of the measurement object and sub-object will be described in detail later. According to an embodiment, the Measurement sub-object may be represented by an index indicating at least one configuration for SS, CSI-RS, or BW in consideration of a separate configuration that does not belong to the Measurement Framework. For the configuration of the separate SS or CSI-RS, at least one of RS type, subframe/slot index, transmission period, offset for the transmission period, and BW may be configured in the terminal. Although FIG. 3G is illustrated assuming that the Measurement object is SS, the Measurement object may also be configured as CSI-RS. In this case, if the Numerology of the CSI-RS set in the Measurement object is the same Default numerology as the SS, it can be omitted, but if it is not the Default numerology, Numerology must be included in the Measurement object setting.

As an embodiment of the method 3, a table shows a case in which the Measurement Object and the sub-object are configured for SS and CSI-RS, respectively. Numerology and BW for SS can be omitted in the settings. It is understood that the UE performs measurement and reporting on the serving cell and neighbor cells for the measurement object, that is, the SS. Also, one white cell list can be additionally set for the measurement object. Numerology and BW for CSI-RS should be included for each Measurement sub-object configuration. One white cell list can be additionally set for all Measurement sub-objects, one white cell list can be additionally set for each Measurement sub-object, or one white cell list can be additionally set for each BWP. . Alternatively, one white cell list can be additionally set for all measurement objects and sub-objects. If only the serving cell ID is listed in the white cell list, the UE performs measurement on the corresponding Measurement object or Measurement sub-object only for the serving cell. However, according to different settings, the UE may compare measurement results for different measurement objects and sub-objects and report when an event occurs.

MO/MS ID RS settings Numerology Allowed measurement BW MO#0 SS Numer#0 (Default) BWP#0 (Default) MO#0 / MS#0 CSI-RS#0 Numer#1 BWP#1 MO#0 / MS#1 CSI-RS#1 Numer#1 BWP#2 MO#0 / MS#2 CSI-RS#2 Numer#2 BWP#3

Meanwhile, when setting the measurement BW for the measurement object and the sub-object, the existing LTE indicated only the bandwidth of the BW for measuring the CRS in the Allowed measurement BW. That is, the following Enumeration was used.

This is because in the previous CRS, the center frequency of the carrier was determined from the specification and SS reception, and the only variable was the bandwidth. However, in 5G NR, the SS measurement BW has a fixed center frequency and even a bandwidth may be preset as in LTE, but the CSI-RS resource and measurement BW may be configured for each UE. Therefore, the degree to which the center frequency of the measured BW differs from the carrier center frequency should be reported as a variable such as offset. The base station may set at least one of offset, BW, BW start and end, numerology to be used, and control channel to the terminal as one unit called BW part as RRC. Therefore, if the BW part is used, the above variables are grouped and expressed as one, which helps to simplify the measurement setting. The base station directs the BW for RRM measurement by using the BWP index directly on the premise of setting a plurality of BWPs, or similarly to LTE, all or part of the set BWP is reconfigured in a List format and indicated using the index. have. If you want to further instruct the measurement operation related to BWP, you can use the index to reconfigure the BWP ID and related variables (at least one of period, time offset, opportunity, and interval) in a sequence format to indicate.

As another embodiment of the method 3, the case where both the measurement object and the sub-object are configured for CSI-RS is shown in a table. Numerology and BW for CSI-RS should be included for each Measurement Object and sub-object configuration. One white cell list is additionally set for all Measurement Objects and sub-objects, or one white cell list is additionally set for each Measurement Object and all Measurement sub-objects, or Measurement objects and each Measurement sub-object One white cell list may be additionally set for each, or one white cell list may be additionally set for each BWP. If only the serving cell ID is listed in the white cell list, the UE performs measurement on the corresponding Measurement object or Measurement sub-object only for the serving cell. However, according to different settings, the UE may compare measurement results for different measurement objects and sub-objects and report when an event occurs.

MO/MS ID RS settings Numerology Allowed measurement BW MO#0 CSI-RS#0 Numer#1 BWP#1 MO#0 / MS#0 CSI-RS#1 Numer#1 BWP#2 MO#0 / MS#1 CSI-RS#2 Numer#2 BWP#3 MO#0 / MS#2 CSI-RS#3 Numer#2 BWP#4

As an example of the CSI-RS configuration in the above example, when the port ID is fixed, preset, or configured in the measurement configuration IE, other variables as follows may be configured.

Alternatively, you can set variables as follows, including port ID.

Alternatively, you can include Numerology information and set it up as follows.

Numerology information for measuring CSI-RS in the setting of the Measurement object and the Measurement sub-object may be explicitly indicated by the Measurement object/sub-object setting, or may be indicated by the BW part or the measurement CSI-RS setting. In general, the CSI-RS configuration may be defined for the entire system band of the base station regardless of the BW part. If the numerology is different, the base station may instruct the UE to set the CSI-RS resource for each numerology. On the other hand, the base station may instruct the terminal for numerology for transmission/reception of the control/data channel by setting SI (System Information) or BW part. RRC Idle UE is instructed Numerology for control/data channel through SI, but RRC Connected UE is instructed Numerology for control/data channel from the base station through BW part setting. If the numerology set in the BW part currently actively operating does not have the same numerology included in one or more CSI-RS settings, the UE determines one of the CSI-RS settings arbitrarily or according to the set priority to receive CSI-RS operation carry out In this case, the UE must perform an RF retuning process to change the numerology prior to measuring the CSI-RS. When the CSI-RS measurement at this time is finished, the UE again performs an RF retuning process to change the numerology according to the BW part setting. Unlike the previous case requiring the RF retuning process, if the Numerology set in the BW part currently actively operating is the same in the Numerology included in one or more CSI-RS settings, the Numerology selects the same CSI-RS setting and selects the CSI -RS Receive operation is performed. At this time, the UE does not need to perform the RF retuning process for changing the numerology prior to the measurement of the CSI-RS.

According to Scheme 4, when the serving base station sets the settings for Measurement and Report with the RRC connection reconfiguration message, the carrier can also be indicated as the conventional measurement object, but it can also indicate partial resources (time/frequency) within any carrier. can As shown in FIG. 3h, when the measurement object is indicated, if the offset compared to the center carrier frequency or DC (direct current) component carrier is 0, it indicates the existing carrier. corresponds to You need to know the BW of the resource for RRM measurement to accurately measure it, so you can additionally inform the BW information. As in method 2 above, it also informs the numerology to measure the measurement object. The carrier-specific, RS-specific, UE group-specific, UE-specific, BW-specific, or numerology-specific base station quality value measured for the measurement object is reflected in the triggering condition tied to the measurement ID. When a plurality of measurement objects and triggering conditions are set for one carrier or base station, the terminal may configure a plurality of MO sets for the same base station based on only the carrier or the carrier and the PCID. How the MO set is reflected in the triggering condition for one HO determination will be described later in detail.

According to an embodiment of the method 4, a series of RS lists may be configured in the one Measurement object. However, offset, BW, and numerology information, which are measurement band information, are commonly applied to one or more RSs. A table shows a case in which one or more CSI-RSs in the Measurement Object are configured. Numerology and BW settings are commonly applied to all CSI-RSs. One white cell list can be additionally set for all Measurement Objects. If only the serving cell ID is listed in the white cell list, the UE performs measurement on the corresponding Measurement object or Measurement sub-object only for the serving cell. However, according to different settings, the UE can compare measurement results for different measurement objects and report when an event occurs.

MO ID RS settings Numerology Allowed measurement BW MO#0

CSI-RS#0 Numer#1


BWP#1


CSI-RS#1 CSI-RS#2 CSI-RS#3

According to another embodiment of the method 4, a series of RS lists may be configured in the one Measurement object. However, Numerology information is commonly applied to one or more RSs. A table shows a case in which one or more CSI-RSs in the Measurement Object are configured. Numerology settings are commonly applied to all CSI-RSs, but BWP settings can be set separately for each CSI-RS. One white cell list can be additionally set for all Measurement Objects, or one white cell list can be additionally set for each BWP. If only the serving cell ID is listed in the white cell list, the UE performs measurement on the corresponding Measurement object or Measurement sub-object only for the serving cell. However, according to different settings, the UE can compare measurement results for different measurement objects and report when an event occurs.

MO ID RS settings Numerology Allowed measurement BW MO#0


CSI-RS#0 Numer#1


BWP#1 CSI-RS#1 BWP#2 CSI-RS#2 BWP#3 CSI-RS#3 BWP#4

In the above embodiments, at least one of a Measurement object, a Measurement sub-object, and BWP information that is effective for setting a white cell list may be connected and configured. In this case, there is no need to set the white cell list in duplicate for each measurement object, measurement sub-object, and BWP setting.

According to an embodiment, when at least one or more of 4 in the above method 1 is operated together in one network, at least an indicator indicating whether the RRM resource measured from the viewpoint of the terminal is common to the serving base station and the neighboring base station. The base station may inform the terminal. Upon receiving the common RRM resource indicator, the terminal does not perform an operation to acquire additional RRM measurement resources (RS, numerology, band, etc.) for the neighboring base station. According to a specific scenario in the Measurement Framework, time information (period, length, etc.) of a resource that does not change frequently may be informed together.

<Overall Measurement and Reporting Procedures>

Various measurement and reporting procedures may be considered for the various Measurement Framework methods described above. Procedure Example-I shown in FIG. 3I is applicable to methods 2 and 3. The UE separates and has the result of measuring one or more Numerology-specific RS for one MO (Measurement Object). In some cases, the terminal may reflect only some measurement results in the overall cell quality according to the numerology selection information. That is, according to the Numerology instruction of the base station or based on the service (slice)-Numerology mapping information possessed by the UE, the UE performs averaging on the selected Numerology-specific RS. The averaging method may be predetermined or set according to a network instruction. The terminal performs the procedure of checking the triggering condition based on the representative quality of one cell obtained according to the result of averaging. When the triggering condition is satisfied, the UE reports one or more Measurement Quantities according to the setting of the base station.

Meanwhile, the UE may perform a measurement operation only on cells specified in the white cell list set for each Measurement ID, Measurement object, Measurement sub-object, and BW part. If specified in Measurement ID, the terminal applies the white cell list to all Measurement objects and Measurement sub-objects belonging to Measurement ID for measurement. If specified in the measurement object, the terminal applies the white cell list to the measurement object and all measurement sub-objects belonging to the measurement object for measurement. If specified in the Measurement sub-object, the UE applies the white cell list to each Measurement sub-object for measurement. If the white cell list is set separately for the Measurement object and the Measurement sub-object, the white cell list set for the object is not applied to the sub-object for which the white cell list is set separately. When the white cell list for each BW part is set, the white cell list set for the SS, CSI-RS, object or sub-object associated with the corresponding BW part is applied. According to an embodiment, when the UE measures neighbor cells in a serving cell, the base station may configure the UE to restrict measurement by applying a different white cell list for each BWP. For this operation, the base station exchanges information between the base stations in order to know which BWP the neighbor cell has set as the RRM BW.

MO ID RS settings Numerology Allowed measurement BW white cell list MO#0
CSI-RS#0 Numer#1
BWP#1 Cell 1,3,5 CSI-RS#1 BWP#2 Cells 2, 4, 6

In the present invention, the Numerology-specific RS may correspond to at least one of a cell-specific RS, a UE-specific RS, or a UE group-specific RS. The cell-specific RS may include a common RS and/or a dedicated RS. The UE-specific RS or UE group-specific RS may include a dedicated RS. The configuration information of the Numerology-specific RS may be transmitted to the UE using at least one of dedicated RRC signaling, L1 signaling, and MAC signaling. The Numerology-specific RS is SS (synch signal), CSI-RS (channel status indication reference signal), CRS (cell reference signal), BRS (beam reference signal), MRS (mobility reference signal), DRS (discovery reference signal) , and may include at least one of a demodulation reference signal (DMRS).

Procedure Example-II shown in FIG. 3J is applicable to Scheme 4. Similar to the existing LTE, this method takes L1 averaging and L3 filtering for each measurement object to obtain a measurement result, and also applies a triggering condition based on the quality determined by each measurement result. However, when one or more triggering conditions are simultaneously operated for one base station, the HO decision must be unified into one, so the base station must make one HO decision based on one or more Measurement Reports. Depending on the implementation, the base station further considers the service/slice or QoS information used by the terminal, and when conflicting results between one or more triggering conditions are found, one HO decision should be obtained. For example, if the terminal is receiving URLLC and eMBB services, priority may be given to a base station using Numerology used for URLLC. The priority between Service/Slice/Numerology may be set by the base station to the terminal by at least one of RRC signaling, MAC signaling, and L1 signaling.

Procedure Example-III shown in FIG. 3K is applicable to Scheme 4. Similar to existing LTE, this method takes L1 averaging and L3 filtering for each measurement object to obtain a measurement result, and also applies a triggering condition based on the quality determined by each measurement result. However, when one or more triggering conditions are simultaneously operated for one base station, the HO decision must be unified into one, so the terminal must make one triggering decision for one or more triggering conditions. To this end, the UE can obtain one conclusion in the manner of a logical function for each Triggering Condition (TC). For example TC = TC#0 AND TC#1 or TC = (TC#0 OR TC#1) AND TC#2; is in the same way as This logical function can be used by setting table and index information from the base station. Additionally, based on the Numerology Set set by the base station or the Numerology Set information associated with the service/slice being used, the Triggering Condition not included in the Numerology Set may be operated assuming that no event has occurred. Alternatively, if there is priority information in the Numerology Set, the UE operates according to when all possible TCs are satisfied, that is, TC = TC#0 AND TC#1 AND TC#2; According to the change of the indicator due to For example, when the condition TC_all = TC#0 AND TC#1 AND TC#2 is not satisfied and the condition TC_some = TC#0 AND TC#1 is satisfied, if the T312 timer for determining RLF has progressed by about X%, TC_all Instead, TC_some can be used as a judgment condition. However, it is necessary to report the Measurement Report transmitted as a result of TC_some to the base station together.

Procedure Example-IV shown in FIG. 3L is applicable to methods 3 and 4. According to this method, a measurement result is obtained by taking L1 averaging and L3 filtering for each measurement object, but only one triggering condition is applied. The triggering condition follows the TC of a measurement object in the case of method 3, and in the case of method 4, the terminal follows the TC of one measurement object according to a rule set by the base station. In order to obtain one measurement result for one TC, a weight is assigned among a plurality of measurement results and filtered. For example, a normalized value may be determined as the final measurement result by multiplying and adding a weight to each measurement result according to the frequency for each numerology used when the UE performs measurement. Alternatively, the determination may be made based on the Numerology Set set by the base station or the Numerology Set linked to the service/slice being used and the priority (or weight) information. The terminal transmits the final Measurement Report to the base station if it is satisfied by reviewing it as a TC for one numerology determined according to the rule/priority information instructed by the base station or set by the base station.

In the description of the overall Measurement Framework, Measurement Resource is generally carrier-specific, but may be cell-specific, UE-specific, or UE group-specific according to a scenario. That is, in the case of carrier-specific, the measure object is a carrier, and time/frequency resources common to the carrier are set. In case of cell-specific, if the measurement object is a carrier, at least one measurement resource index or cell ID must be included in the measurement configuration so that the measurement resource for each cell having a separate index or cell ID has a relationship with the measurement object. In case of cell-specific, if the measurement object is a cell, one cell ID per measurement configuration is sufficient. When UE-specifically configured measurement resources, the base station should inform the relationship between UE-specific measurement resources and measurement configuration. The UE operates the measurement filtering and triggering condition according to the setting of the measurement configuration connected to the measurement resource.

A measurement object may be set for each numerology-specific reference signal, and a type of numerology-specific reference signal may be set to the terminal based on separate indicator information or preset information.

According to an embodiment, the CSI-RS configuration among the measurement object or sub-object configuration can be dynamically configured by the base station to be dedicated, so that the duration of the configuration can be indicated to the UE. The validity period is expressed by a combination of at least one of a frame number, a subframe index, and a slot index. In addition, the range of the setting may be limited to one of a serving base station, a TRP list, a base station list, a RAN paging area, and a CN paging area.

According to an embodiment, the UE should basically perform RRM measurement for the SS configured in one carrier. The SS setting includes at least one variable of the SS transmission period, the period and length of the SS group (or burst), the SS transmission frequency offset, and the SS transmission band index, separately from the setting for the RRM measurement. can be set. When SS is specified in the measurement object or sub-object to additionally set information corresponding to the information of the SS configuration, the terminal operates by overriding the existing SS configuration with the SS measurement configuration included in the Measurement object/sub-object configuration. .

<Report Configuration>

In the case of methods 3 and 4, the RRM measurement report configuration indicated by the base station to the terminal may be different for each numerology. This is to support a case where HO requirements for each service/slice are different. For method 3, variables such as a different reporting period, offset, and threshold can be set for each measurement sub-object. For method 4, variables such as a different reporting period, offset, and threshold can be set for each measurement object as in LTE. On the other hand, when reviewing a plurality of triggering conditions for efficient use of resources, when a report message according to one report setting is transmitted, another report setting, that is, a report on another measurement object/sub-object is piggybacked together can be sent. The terminal determines at least one report to be piggybacked according to at least one of a priority according to the urgency of the report, a priority set by the base station, or a priority according to a service/slice. The base station may set the maximum amount of reports to be sent by the terminal piggybacking.

When reporting according to the Report configuration, the UE may report using the Measurement resource index instead of the Cell ID, or may send the Cell ID and the Measurement resource index together. In the case of SS, the measurement resource index may be at least one of an SS time index, an SS burst index, and an SS measurement interval index. In the case of CSI-RS, it may be at least one of a physical resource port number, a CSI-RS resource index, and a BW part index.

The report configuration may be configured for each numerology-specific reference signal, and a type of numerology-specific reference signal may be configured to the terminal based on separate indicator information or preset information.

According to an embodiment, if there is a measurement result for one or more RSs for one or more BW parts in one measurement object in a measurement report, the terminal determines and reports one representative measurement value for each BW part, or a measurement value for each RS It can be reported along with BW part index information.

<Selection for Measurement Object/sub-object>

When the UE measures the RRM resource previously determined based on the Measurement object or the sub-object, the UE may select a target to be used for measurement according to at least one of the following methods. In the following, the Numerology Set may be set by the base station to an SI or RRC signal, an L1 signal, or a MAC signal according to service/slice information or/and UE capability information or/and mobility type (L1/L2 mobility or L3 mobility).

Option 1) The UE selects the Measurement (sub-)object corresponding to the Numerology or Numerology Set indicated by the BS by the L1 or RRC (L3) or MAC (L2) signal.

Option 2) The UE selects a Measurement (sub-)object corresponding to the numerology associated with RS that can be detected from the resource indicated by the base station by the L1 or RRC (L3) or MAC (L2) signal. The terminal may receive a Numerology Set for blind detection set from the base station according to an example.

Option 3) The UE selects the upper Nth Measurement (sub-)object according to the Numerology Set indicated by the BS by the L1, RRC (L3) or MAC (L2) signal and its priority/weight. N may be determined by the terminal according to UE capability or operation restrictions, or may be set in the terminal by the network obtained by the UE capability information through the RRC connection establishment procedure.

<Averaging/Filtering for Measurement RS>

When a priority or selection among the following is used, the priority or selection may be set by the network or may be set by the terminal according to a rule given by the network. The priority is service/slice priority, numerology priority, measurement (sub-)object priority, QoS priority, power consumption priority, delay priority, RS detection time It is determined according to at least one of a priority according to the priority, a priority according to the urgency of the report, a priority according to the mobility type, and a priority according to the RS type. The selection is determined according to at least one of whether to use service/slice, whether to use numerology, whether to satisfy TC, whether to RS detection, and whether to support according to UE capability.

When the UE has a plurality of measurement resources for each numerology configured, at least one of which numerology or RS is used to the base station, or associated measurement (sub-)object or measurement ID information, must be sent together in the measurement report. .

A. Additional examples of averaging in L1

A-1) Linear Average value for all Detected RS

A-2) The largest value among the Linear Average values for all Detected RSs in each resource by Numerology

A-3) Linear Average value for all Detected RSs in the Numerology resource with the highest priority

A-4) Weighted Average value according to priority for all Detected RS

A-5) The largest value among the Weighted Average values for all Detected RSs in the resource by Numerology

A-6) Filtering value according to priority/weight for Linear Average value for all Detected RS in resource by Numerology

B. Additional examples of filtering in L3

B-1) Input all L1 sample values to L3 filter.

B-2) According to the priority, the L1 sample corresponding to the kth priority among the L1 sample acquisition period (eg 40 ms) is input to the L3 filter. k may be set by the base station.

B-3) When operating a plurality of L3 measurement results, the L3 filter corresponding to the kth priority of the L3 reporting period (eg 200 ms) is reported according to the priority. k may be set by the base station.

B-4) According to the selection rule, input the L1 sample corresponding to the selected measurement (sub-)object during the L1 sample acquisition period (eg 40 ms) to the L3 filter.

B-5) When operating multiple L3 measurement results, the L3 filter corresponding to the selected measurement (sub-)object is reported during the L3 reporting period (eg 200 ms) according to the selection rule.

B-6) Leave the existing measurement framework as it is and give additional filtering information according to the numerology of each cell in L1. L3 is agnostic about filtering in L1.

<Triggering Condition>

Here, the triggering condition among the entire RRM measurement procedure of the present invention will be described in detail.

For a measurement framework in which a plurality of triggering conditions are set for one carrier or base station (group) or measurement object, a method for determining one TC among a plurality of TCs is required for HO stability. For example, a combination of various conditions may be considered as follows. This condition may be determined as one in the network/cell, or the network may set UE-specifically to the UE.

When a priority or selection among the following is used, the priority or selection may be set by the network or may be set by the terminal according to a rule given by the network. The priority is service/slice priority, priority between numerology, priority between measurement (sub-)objects, priority according to QoS, priority according to power consumption, priority according to delay, priority according to mobility type It is determined according to at least one of a priority and a priority according to the RS type. The selection is determined according to at least one of whether to use service/slice, whether to use numerology, whether to satisfy TC, whether to RS detection, and whether to support according to UE capability.

C-1: When all TCs are satisfied

C-2: When one TC is satisfied

C-3: when the selected K TCs are satisfied; K may be the size of the numerology set directly set by the base station to the terminal or set by the base station to the terminal.

C-4: when the TCs of the K highest priorities are satisfied; K may be the size of the numerology set directly set by the base station to the terminal or set by the base station to the terminal.

C-5: when the TCs of the K lowest priorities are satisfied; K may be the size of the numerology set directly set by the base station to the terminal or set by the base station to the terminal.

As an example of the triggering condition and reporting procedure, the base station may set whether the measurement result for each measurement sub-object or BW part is reflected as a target of the triggering condition to the terminal. In addition, it is possible to set whether to reflect this for a specific event rather than all events. With this operation, the base station sets the UE to trigger only the A3 event (A3 compares the serving cell and the neighbor cell) for a certain measurement sub-object or BW part, and sets the A1 event (for other measurement sub-objects or BW parts) A1 can be set to trigger only for the absolute value of serving). This method has the advantage of being able to express more diverse cases than the method using the white cell list above.

<Measurement Reconfiguration>

Here, measurement reconfiguration among the entire RRM measurement procedure of the present invention will be described.

The advantage of the numerology-specific measurement framework described so far is that, since the measurement report is classified by numerology, the base station or the terminal can detect a measurement problem and adjust the RRM measurement settings. 3M and 3N show how the numerology of an observation target base station operates. And the blue rectangle indicates the resource in which the terminal is operating in the serving base station. According to FIG. 3M, (a) is a case in which the terminal operates on a resource including a center carrier with numerology 0 in the serving base station and is set to measure the resource corresponding to numerology 0 of the neighboring base station, (b) is the case in the serving base station This is a case in which the UE operates on a resource that does not include a center carrier with numerology 1 and is configured to measure a resource corresponding to numerology 1 of a neighboring base station. In both cases (a) and (b), since numerology and measurement resources are the same, there is no loss in measurement results.

On the other hand, according to FIG. 3N, (c) is a case in which the terminal operates on a resource including a center carrier with numerology 0 in the serving base station and is configured to measure the resource corresponding to numerology 1 of the neighboring base station, (d) is the serving This is a case in which the UE operates on a resource that does not include a center carrier with numerology 2 in the base station and is configured to measure the resource corresponding to numerology 1 of a neighboring base station. In both cases (c) and (d), since numerology and measurement resources are not the same, loss of measurement results may occur. In case (c), for example, the network identifies a problem in the measurement report for numerology 0 of the terminal and resets the terminal to measure the resource of numerology 1. In case (d), for example, the network identifies a problem in the measurement report for numerology 1 of the terminal, and resets the terminal to first measure the resource of numerology 0. If the TC is satisfied as a result of the UE's measurement report for numerology 0, it is reset to measure the resource of numerology 2 related to the service/slice. As for the reset method, the base station sends the terminal to 1) resets numerology and resource information with the L1 signal, 2) resets the measurement (sub-)object with the RRC connection reconfiguration message, or 3) the terminal sends the cell-specific signal of the neighboring base station (eg PBCH, SI) or UE-specific signals (eg RRC messages) may reconfigure the measurement (sub-)object.

On the other hand, in order to measure another RRM resource in the case shown in FIG. 3N, the base station may configure a measurement gap and/or a measurement resource to the terminal. According to the measurement gap operation used in LTE, every 40 ms or 80 ms, for a maximum of 6 ms, it gives an opportunity to search for another base station without monitoring the serving base station during continuous subframes. In 5G NR, since resources by numerology of neighboring base stations can be changed dynamically, a short measurement gap spread at intervals of several ms can be rather useful. Alternatively, the UE may add an explicit and temporary measurement gap setting in the response message of the base station to the measurement measurement report. The base station may further set numerology and resource information to be observed when setting the measurement gap.

FIG. 3y shows a terminal operation according to various examples of the above-described Measurement Configuration, Measurement Object/sub-object, L1/L3 Filtering, Triggering Condition, and Measurement Report. The UE receives RRM measurement configuration for RRM resource and report by the base station. RRM resource can be set for each Numerology, RS-type, and RRM resource type (Common/Dedicated). In addition, the terminal receives the setting for measurement restriction from the base station. The terminal performs measurement on a measurement resource other than the resource for which the measurement restriction is set. The measurement procedure is largely divided into four steps: L1 filtering (or averaging), L3 filtering, triggering condition, and measurement report. Each step may proceed in different ways depending on the option. The L1 filtering step is performed separately by (a) measurement object and measurement sub-object, (b) separately by numerology or RS-type, (c) separately by RRM resource type, or (d) or perform without separation for all RRM resources; It can operate according to one of the In the L3 filtering step, for the result of the L1 filtering step, (i) separately performed by measurement object and measurement sub-object, (ii) performed separately by Numerology or RS-type, or (iii) by RRM resource type Performed separately, or (iv) performed without separation for all RRM resources; It can operate according to one of the The triggering condition step may include (1) checking each triggering condition, or (2) checking only one triggering condition for the filtering result value performed separately in the L3 filtering step; It can operate according to one of the In (1), additionally, there may be a procedure to confirm that one or N triggering conditions are satisfied. The Measurement Report step is performed when the Condition is satisfied in the Triggering Condition step, and for the Triggering Condition result, (A) a separate measurement result for each measurement resource is reported, or (B) an integrated one for each measurement resource report a representative value of; It works according to one of the (A), (B) in operation, only the measurement resource for which the Triggering Condition is satisfied according to the terminal implementation or the base station setting is considered in the report, or all of the maximum N measurement resources are considered in the report; It can operate according to one of the

3z is a flowchart of a part of measurement setting and operation of a base station. The base station gives measurement settings and measurement restriction settings to the terminal. The base station receives the measurement report from the terminal. If necessary, the base station grants reconfiguration according to the changed RRM resource and the changed reporting method to the terminal. When the base station receives the RRM measurement report from the terminal, it checks whether the HO condition is satisfied and initiates the HO procedure. On the other hand, when the terminal determines whether the HO condition is satisfied and the terminal-based HO procedure is configured to initiate HO under the delegation of the base station, the terminal performs the HO procedure with the selected neighboring base station first, and the serving base station receives the necessary procedure from the neighboring base station HO setup message for . The serving base station performs the HO procedure in which the terminal information (HO context, etc.) and remaining data are transferred to the neighboring base station.

<Handover Procedure>

Here, we describe how the HO procedure is performed based on Numerology-specific RRM Measurement.

HO procedure method 1. When there is one mobility decision for one terminal:

In the present invention, it is assumed that most of the HO procedure method 1, that is, there is one mobility decision for one terminal. This means that the terminal cannot perform HO to a plurality of different base stations at the same time. In the main text, a flow chart for several cases corresponding to HO procedure method 1 is described.

HO procedure method 2. When there are multiple Mobility Decisions for one UE:

This is a case where one terminal performs HO to a plurality of different base stations according to a plurality of triggering conditions. However, in this case, it is possible only when the terminal supports DC (Dual Connectivity) or MC (Multi Connectivity).

FIG. 3o shows a procedure in which a serving base station updates RRM measurement information to a CONNECTED UE by periodically exchanging RRM measurement information (at least one of resources, RS, SS, and numerology) between base stations. When the serving base station gNB1 sends an RRM measurement reconfiguration request to the target base station gNB2, it includes at least one of service/slice/Numerology information and Numerology specific RS type. gNB2 provides RRM measurement resource information to gNB1 in an RRM reconfiguration response message based on the resource used by gNB2 for at least one of the requested service/slice/Numerology information and Numerology specific RS type. Referring to FIG. 3O , the terminal does not differ from the existing HO procedure. However, this method can create a significant load on the network interfaces such as X2, S1, and Xn between base stations.

3p is similar to the method of FIG. 3o, but the base station does not periodically reconfigure the RRM measurement, but reconfigures it in an event-driven manner based on the UE's measurement report. That is, if the base station quality for the neighboring base station in the terminal's measurement report is less than a certain value, the base station recognizes the problem and requests RRM measurement reconfiguration with the base station gNB2, which can be known by the PCI and ECGI information included in the terminal's measurement report. and exchanging response messages to update information.

More specifically, this method can be applied to a case where the network is operated with a common RS and a dedicated RS. The common RS may correspond to a cell-specific RS. The dedicated RS may correspond to a cell-specific RS or may correspond to a UE-specific RS. For example, the UE first measures and reports only the common RS (numerology 0) of the neighboring base station. The base station may additionally set dedicated RS (numerology 1) and related RRM resource information to the terminal when the common RS-based result indicates reliable base station quality according to the report of the terminal. The terminal separately measures numerology 0 and numerology 1 according to one of the methods proposed in the present invention and reviews one triggering condition based on this, or reports on a plurality of triggering conditions and the network obtains one mobility decision pay

FIG. 3q shows a method in which the UE directly acquires RRM measurement information from the target base station (gNB2), and also determines measurement reconfiguration accordingly. To support this, the serving base station (gNB1) sets a measurement gap to the terminal (including at least one of the resource to be observed, the type of RS, and numerology if necessary), and the terminal sets the signal of the neighboring base station (in the example) according to the set measurement gap. Sync signal (SS) and/or SI) is searched. The UE may acquire at least one of service/slice/Numerology provided by gNB2 and corresponding resources and RRM measurement information from SS or/and SI. The UE performs measurement according to the obtained RRM measurement information of gNB2 and determines whether to reconfigure the RRM measurement. When the UE determines that measurement reconfiguration is necessary, it sends an RRM measurement reconfiguration request message to the serving base station (gNB1). In this message, at least one of PCI/ECGI, numerology-specific resource information, and base station quality for indicating gNB2, which is the target of the determination, may be transmitted. The base station may decide whether to perform RRM measurement reconfiguration with gNB2 reported according to the request of the terminal, and may exchange related information as in the previous procedure, or may directly send an RRM connection reconfiguration response message to the terminal according to information already known.

FIG. 3r is a procedure in which the terminal directly accesses the target base station (gNB2) in addition to FIG. 3q to update the RRM resource through the exchange of RRM reconfiguration request/response message and to perform accurate measurement accordingly. Meanwhile, when accessing a specific base station based on a common RS, the terminal may request service/slice availability information to check whether the target base station provides a necessary service/slice. The common RS may correspond to a cell-specific RS.

The terminal acquires 1) service (slice)-numerology mapping information or 2) information for each base station of slice availability from the network. 1) corresponds to the case where the target cell provides only numerology information, and 2) corresponds to the case where the base station list (white/black list) is received through the serving cell. If one cell does not support the service desired by the terminal, filtering is possible through the white/black list. When a cell uses only some resources to provide a service desired by the UE, the UE measures the resources of the target cell that can be measured within the operating conditions of RF/PHY/MAC according to the control in the serving cell. If measurement is possible, a report is raised, and if measurement is impossible or the performance of the best cell falls below a certain level, an RRM resource reconfiguration request is raised.

The examples below show the case where the above procedure is advantageous.

Example 1) If the measurement result of the eMBB/URLLC terminal for the base station (cell1) supporting both eMBB and URLLC and the base station (cell2) supporting only URLLC (cell2) is better, Triggering Condition for Numerology-specific RS connected to a certain service You have to decide whether to trigger or not. For example, if the URLLC priority is high, you can trigger on cell2 first. In this case, the eMBB may be access barred or RLF processed. Example 2) The measurement result of the URLLC terminal for a base station supporting both eMBB and URLLC (cell1) and a base station supporting only URLLC (cell2). If there is no numerology distinction, the measurement result for cell1 may be better, but the numerology distinction is not If there is, the measurement result for cell2 is better obtained. Example 3) In one base station, frequency resources are divided into TRP1 and TRP2, but common resources are shared by TRPs. In this case, a specific service may be provided only with a specific frequency resource. Even if the measurement performance for one base station, the performance for the TRP can also be classified by reporting it separately for each RS/Numerology.

The base station may inform a performance index for serviceable carrier/numerology-specific cell quality. If there is a measurement result corresponding to the performance suggested by the base station, the terminal may report the measurement result without performing additional measurement. This method is particularly effective in preventing a long delay due to UE beam sweeping in a beamforming system.

3s is a procedure using a 2-way RA procedure instead of a 4-way RA procedure compared to FIG. 3r.

3T is a procedure using grant-free access compared to FIG. 3R/ FIG. 3S using an RA procedure.

According to an embodiment, the UE may simultaneously measure common RRM resources (Common RS, SS, or Default Numerology-specific RS) of at least two base stations for one of the HO procedures. When the UE satisfies at least one TC among the triggering conditions for the at least two or more base stations, the UE reports a Measurement Report for the measured Common RRM resource. Based on the report of the UE, the base station may configure additional RRM resources (Dedicated RS, CSI-RS, or Dedicated Numerology-specific RS) to the UE according to one of the various HO procedures.

According to an embodiment, the UE may simultaneously measure common RRM resources (Common RS, SS, or Default Numerology-specific RS) of at least two base stations for one of the HO procedures. When the terminal satisfies at least one TC among the triggering conditions for the at least two or more base stations, an additional RRM resource (Dedicated RS, CSI-RS, or Dedicated Numerology-specific RS) for the target base station that satisfies the TC is provided to the serving base station or target You can request it from the base station.

<Measurement Restriction Procedure>

In the existing LTE, Time-domain Measurement Resource Restriction was introduced to eliminate measurement errors that may occur when measuring ABS (Almost Blank Subframe) for PCell. ABS is a subframe in which the base station can lower transmit power or transmit only a control channel. The base station using ABS informs the connected terminal of ABS in a subframe unit as a bitmap, and controls the terminal not to perform RRM or RLM measurement in the subframe corresponding to the ABS.

On the other hand, assuming that Measurement Resource Restriction based on the existing ABS indication is applied to 5G communication in which Numerology can be dynamically set, even if the UE indicates ABS for the serving base station as shown in FIG. Since the incoming interference cannot be clearly distinguished, it is measured in the form of on/off of the signal of the serving base station. Such indistinguishable fluctuations in the interfering signal make it difficult to accurately measure the channel quality of the serving base station. Therefore, when the ABS indication information of the neighboring base station is instructed to the terminal, the terminal can apply to the triggering condition by distinguishing the case where there is no interference of the neighboring base station, and can also report separately in the measurement result and report.

On the other hand, for a mixed scenario in which a plurality of numerologies are used in a neighboring base station in 5G communication, the UE can acquire not only RSRP but also RSRQ in a subframe in which the serving base station and the neighboring base station use the same numerology, but sub using different numerology Only RSRP acquisition is possible in a frame. In existing LTE, there is an MBSFN subframe having a different RS/channel structure for broadcasting, and the serving base station may inform the UE of MBSFN subframe information of a neighboring base station. The UE does not measure the measurement resource in the MBSFN subframe of the neighboring base station.

Therefore, as shown in FIG. 3w, when the subframe configuration for each numerology of the serving base station and the neighboring base station is informed to the terminal in a bitmap, the terminal is set to measure the RSRQ of the serving base station, the subframe using Numerology 1 of the serving base station and the neighboring base station In the case of the same subframe using Numerology 1 of , it can be reported based on the measured RSRQ.

The operation illustrated in FIG. 3u-w can be similarly applied to the channel quality of the neighboring base station as well as the serving base station. According to an embodiment, the ABS per base station or the subframe pattern per numerology may be a separately set time/frequency measurement resource unit, not a subframe unit.

The resource pattern for the Measurement Restriction may be configured for each time/frequency resource and/or for each numerology. The serving base station may set at least one resource pattern for the measurement restriction in the terminal. The base station may set the resource pattern for the Measurement Restriction in the terminal in connection with the Measurement Object or Sub-object of the Measurement Framework, or may be configured in connection with the RRM resource configuration or RS configuration other than the Measurement Framework.

The terminal checks Numerology or RS type information or RS resource or BW part information for at least one or more resource patterns for the Measurement Restriction, and matches the Numerology or RS type or RS resource or BW part information currently used for RRM measurement. Based on the resource pattern, the RRM measurement operation is performed by classifying resources not to be used for measurement. According to an embodiment, the index of the Measurement Restriction resource pattern or the index for the configuration including the resource pattern is given to the terminal, and when the terminal makes a Measurement Report, the index for the resource pattern or the configuration including the resource pattern You can report the index together.

According to an embodiment, one measurement restriction configuration includes the resource pattern (meaSubframePatternNeigh), a base station list to which this pattern is applied (meaSubframeCellList), and a BW part index to which this pattern is applied. Instead of BWP ID, RS format, or CSI-RS configuration index or numerology index may be replaced.

3X is a diagram illustrating a configuration of a terminal device according to an embodiment of the present disclosure.

<Fourth embodiment>

In this document, we propose a method for the UE to determine whether to perform signal strength measurement on neighboring cells according to the signal strength of the serving cell. In LTE, if the idle mode UE measures the cell-specific reference signal (CRS) and satisfies the following conditions, intra-frequency measurement, that is, signal strength measurement for neighboring cells operating at the same frequency as the serving cell is not performed. .

「Following rules are used by the UE to limit needed measurements:

- If the serving cell fulfils Srxlev > SIntraSearchP and Squal > SIntraSearchQ, the UE may choose not to perform intra-frequency measurements.

- Otherwise, the UE shall perform intra-frequency measurements.」

Here, Srxlev and Squal are defined as follows, and SIntraSearchP and SIntraSearchQ are parameters that the base station informs the terminal.

Srxlev = Q _rxlevmeas - (Q _rxlevmin + Q _{rxlevminoffset} ) - Pcompensation - Qoffset _temp

Squal = Q _qualmeas - (Q _qualmin + Q _{qualminoffset} ) - Qoffset _temp

It is based on the following parameters.

In addition, in LTE, the connected mode terminal measures the signal strength of the CRS received through the PCell (primary cell) and, if the result is greater than the s-Measure parameter informed by the base station, intra-frequency, inter-frequency, inter-RAT neighbor cell There is no need to perform signal strength measurement for To this end, the base station informs the terminal of the s-Measure value through a measurement configuration message. These contents are described as follows in document 36.331, the RRC layer standard of LTE.

As we have seen so far, in LTE, the idle mode and connected mode terminals measure the CRS transmitted from the camping base station or the serving base station, and when the signal strength meets a specific condition, that is, the signal strength of the camping base station or serving base station increases. If it is determined that it is high enough, it operates so as not to perform signal strength measurement for a neighboring base station. The purpose of this operation is to save power of the terminal. If the terminal is close to the serving base station, it is unlikely to suddenly move to the neighboring base station within a short time. In this case, it may not be necessary to measure the signal strength of the terminal to the neighboring base station. Therefore, the serving base station provides the terminal with specific conditions such as a threshold value of signal strength, so that when the likelihood of the terminal's mobility occurring is low, it operates regardless of the need to perform signal strength measurement on the neighboring base station. Of course, even if this condition is satisfied, it is allowed for the terminal to measure the signal strength of the neighboring base station.

In LTE, both idle mode and connected mode terminals can determine whether to measure signal strength for neighboring cells based on the CRS measurement result. However, in NR (New Radio), which is currently being discussed in 3GPP, CRS disappeared and NR-SS (NR Synchronization Signal) and CSI-RS were introduced instead. [Fig. 4a] shows an example in which the base station transmits NR-SS and CSI-RS.

NR-SS may be transmitted through a wider beam than CSI-RS. Therefore, there is an advantage that beam sweeping can be performed for a short time in transmitting a signal to the entire cell area. However, transmission through a wide beam means that the beamforming gain is reduced that much. Therefore, the UE is highly likely to receive the NR-SS with a lower signal strength compared to the CSI-RS.

On the other hand, CSI-RS may be transmitted through a narrow beam compared to NR-SS. Therefore, there is a disadvantage that beam sweeping needs to be performed for a long time in transmitting a signal to the entire cell area. However, transmission through a narrow beam means that the beamforming gain is increased that much. Therefore, the UE is highly likely to receive the CSI-RS with a higher signal strength than the NR-SS.

According to the NR design currently in progress, the idle mode UE can receive NR-SS, but cannot receive CSI-RS. This is because, in order to receive the CSI-RS, the UE needs to receive a CSI-RS related configuration from the base station after establishing a connection with a specific base station, but the idle mode UE cannot perform this operation. Unlike this, the connection mode terminal may receive both NR-SS and CSI-RS. In this situation, there is a problem in how the terminal can determine whether to perform signal strength measurement for a neighboring base station.

First, since idle mode terminals can receive only NR-SS, it is not necessary to measure the signal strength of neighboring cells by measuring the signal strength of the NR-SS transmitted by the base station currently camping and satisfying conditions similar to LTE. That is, Q _rxlevmeas and Q _qualmeas in the following equations are the results obtained by the UE measuring the NR-SS. Therefore, in the case of the idle mode UE, the type of RS measured by the UE in NR compared to LTE is changed from CRS to NR-SS.

Srxlev = Q _rxlevmeas - (Q _rxlevmin + Q _{rxlevminoffset} ) - Pcompensation - Qoffset _temp

Squal = Q _qualmeas - (Q _qualmin + Q _{qualminoffset} ) - Qoffset _temp

Next, the connected mode UE may receive both NR-SS and CSI-RS. Therefore, if the signal strength of the NR-SS transmitted from the PCell of the serving base station is greater than or equal to s-Measure, it is not necessary to measure the signal strength of the neighboring base station, and the signal strength of the CSI-RS transmitted from the PCell of the serving base station is s -Measure or more, it is not necessary to measure the signal strength of the neighboring base station.

However, NR-SS and CSI-RS may be transmitted through beams having different beamforming gains. Therefore, even if the positions of the base station and the terminal are fixed, that is, even when the distance between the base station and the terminal is set to a single value, the signal strength of the NR-SS measured by the terminal and the signal strength of the CSI-RS measured by the terminal may be different. have.

Therefore, the s-Measure, which is the threshold value of the signal strength of the serving cell that determines whether the UE measures signal strength for the neighboring base station, has different values depending on whether the UE has measured NR-SS or CSI-RS. should be applied That is, s-Measure _NR-SS and s-Measure _CSI-RS must be defined separately.

Therefore, the base station provides the following information to the terminal through the measurement configuration information element. The changed part is underlined.

After the terminal receives the above information, that is, s-Measure _NR-SS and s-Measure _CSI-RS from the base station, the terminal operates as in [Fig. 4b].

As another example, the following cases may occur according to the NR-SS and CSI-RS measurement results of the UE. And in each case, the terminal operates as follows.

Case 1) RSRP _NR-SS > s-Measure _NR-SS & RSRP _CSI-RS > s-Measure _CSI-RS

- In this case, the applicable UE operation is not to measure both the NR-SS and the CSI-RS transmitted by the neighboring base station because the signal strength of both the NR-SS and the CSI-RS is greater than s-Measure.

- In this case, another applicable operation of the terminal is to continuously measure the NR-SS transmitted by the neighboring base station despite the case 1 situation in order to continuously maintain synchronization with the serving base station.

Case 2) RSRP _NR-SS > s-Measure _NR-SS & RSRP _CSI-RS < s-Measure _CSI-RS

- In this case, the applicable operation of the UE is to measure both the NR-SS and the CSI-RS transmitted by the neighboring base station because the signal strength of the CSI-RS is smaller than s-Measure.

- In this case, another applicable operation of the UE is to measure only the CSI-RS transmitted by the neighboring base station because the signal strength of the CSI-RS is smaller than s-Measure.

- In this case, another applicable operation of the terminal is not to measure both the NR-SS and the CSI-RS transmitted by the neighboring base station because the signal strength of the NR-SS is greater than s-Measure.

Case 3) RSRP _NR-SS < s-Measure _NR-SS & RSRP _CSI-RS > s-Measure _CSI-RS

- In this case, the applicable operation of the UE is to measure both the NR-SS and the CSI-RS transmitted by the neighboring base station because the signal strength of the NR-SS is smaller than s-Measure.

- In this case, another applicable operation of the terminal is to measure only the NR-SS transmitted by the neighboring base station because the signal strength of the NR-SS is smaller than s-Measure.

- In this case, another applicable operation of the UE is not to measure both the NR-SS and the CSI-RS transmitted by the neighboring base station because the signal strength of the CSI-RS is greater than s-Measure.

Case 4) RSRP _NR-SS < s-Measure _NR-SS & RSRP _CSI-RS < s-Measure _CSI-RS

- In this case, the applicable operation of the UE is to measure both the NR-SS and the CSI-RS transmitted by the neighboring base station because the signal strengths of both the NR-SS and the CSI-RS are smaller than s-Measure.

Next, consider a situation in which the terminal performs handover from the LTE base station to the NR base station. The biggest difference between LTE and NR in the UE deriving cell quality is that in the case of LTE, a reference signal for deriving cell quality, that is, CRS, is transmitted in a single beam, whereas in the case of NR, a reference signal for deriving cell quality, i.e., NR- The SS or CSI-RS may be transmitted in a single beam or may be transmitted in a plurality of beams.

If the NR base station transmits NR-SS or CSI-RS using a single beam, the UE receives the NR-SS or CSI-RS transmitted with a single beam, measures the received signal strength, and transmits it to the NR base station. It is determined by cell quality.

If the NR base station transmits NR-SS or CSI-RS using a plurality of beams, the UE first receives the NR-SS or CSI-RS transmitted through each beam and then measures the received signal strength. Next, one or N beams are selected in the order of the highest measured received signal strength. And the cell quality for the NR base station is determined by the average value of the received signal strength of the NR-SS or CSI-RS transmitted through the selected beam.

In deriving the cell quality of the NR base station in which the terminal operates a plurality of beams, the LTE base station or the NR base station needs to inform the terminal how many beams should be selected to derive the cell quality of the NR base station. Most basically, the following choices are possible.

(1) The LTE or NR base station instructs the terminal to derive the cell quality of the NR base station in consideration of one beam.

A. For this, the LTE base station or the NR base station provides the UE with the fact that the number of beams for deriving the cell quality of the NR base station is 1.

(2) LTE or NR base station instructs the terminal to derive the cell quality of the NR base station in consideration of N beams. where N is greater than 1.

A. For this, the LTE base station or the NR base station provides the UE with the fact that the number of beams for deriving the cell quality of the NR base station is N.

(3) The LTE or NR base station instructs the terminal to derive the cell quality of the NR base station in consideration of the maximum N beams. where N is greater than 1.

A. For this, the LTE base station or the NR base station provides the UE with the fact that the maximum number of beams for deriving the cell quality of the NR base station is N.

(4) The LTE or NR base station instructs the terminal to derive the cell quality of the NR base station in consideration of a beam having a received signal strength of NR-SS or CSI-RS equal to or greater than a threshold.

A. For this, the LTE base station or the NR base station provides a threshold value of the beam received signal strength for deriving the cell quality of the NR base station to the terminal.

(5) The LTE or NR base station instructs the terminal to derive the cell quality of the NR base station by considering up to N beams having the received signal strength of the NR-SS or CSI-RS equal to or greater than the threshold. Here, N may be greater than or equal to 1.

A. To this end, the LTE base station or the NR base station provides the terminal with the fact that the maximum value of the number of beams considered and the threshold value of the beam received signal strength for deriving the cell quality of the NR base station is N.

(6) The LTE or NR base station instructs the terminal to derive the cell quality of the NR base station in consideration of a beam in which the received signal strength of the NR-SS or CSI-RS is within the offset value compared to the maximum measured value.

A. For this, the LTE base station or the NR base station provides an offset value used to derive the cell quality of the NR base station to the terminal.

B. It provides the fact that the threshold value of the beam received signal strength and the maximum value of the number of beams to be considered are N.

(7) The LTE or NR base station instructs the terminal to derive the cell quality of the NR base station by considering up to N beams in which the received signal strength of the NR-SS or CSI-RS is within a predetermined value compared to the maximum measured value. Here, N may be greater than or equal to 1.

A. For this purpose, the LTE base station or the NR base station provides the terminal with the fact that the offset value used to derive the cell quality of the NR base station and the maximum value of the number of beams considered is N.

(8) The terminal itself determines the number of beams from which the cell quality of the NR base station is derived.

A. For this purpose, the LTE base station or the NR base station provides an indicator instructing the terminal to derive the cell quality of the NR base station by itself.

The information described above, that is, the number of beams, the maximum number of beams, a threshold value, an offset value, etc. may be applied to each frequency to be measured or applied to each cell. In addition, some information may be applied to each frequency to be measured, and some information may be applied to each cell.

An example of the information element transmitted by the LTE base station or the NR base station below shows an example in which the information described above is applied to each frequency.

In addition, an example of the information element transmitted by the LTE base station or the NR base station below shows an example in which the information described above is applied to each cell.

[Fig. 4c] shows a procedure in which the LTE base station transmits the above-described measurement configuration information element to the terminal and the terminal performs measurement on the NR base station according to the received measurement configuration. If the NR base station satisfies a specific condition specified in the measurement configuration, the terminal transmits a measurement report to the LTE base station.

As an additional embodiment of the present invention, a detailed operation in which the terminal derives a single cell signal quality measurement result from a plurality of beam signal quality measurement results is proposed. This corresponds to the operation of the “cell-level value derivation” block in option 1, option 2, and option 3 of [Fig. 4d]. That is, it can be applied to all of option 1, option 2, and option 3, and in this document, it is assumed that the proposed operation is applied to option 2 will be described. Here, “cell-level value derivation” may be used as the same meaning as “beam consolidation”.

In this document, for convenience of explanation, option 2 of [Fig. 4d] has been described as the basis. However, the present invention can be applied to option 1 and option 3 in the same principle. Only in option 1, the input value of cell-level value derivation becomes an L1 measurement sample that has not undergone L1/L3 filtering, and in option 2, the input value of cell-level value derivation becomes the output of the L1 filter. Also, in option 3, the input value of cell-level value derivation becomes the output of the L3 filter.

The operation proposed in the embodiment of the present invention is shown in [Fig. 4e]. This is (1) the output of the previous step, that is, selecting the N beams having the highest filtered signal strength and the corresponding signal strength among the layer 1 filtering results for each M base station beams, (2) selecting these N beams from among the selected N beams. Selecting unnecessary beams and their corresponding signal strengths in order not to consider unnecessary beams and corresponding signal strengths in derivation of cell quality based on the signal strength of It consists of determining the average value, sum, or weighted average value of the signal strength as the cell quality.

Let's learn more about [Fig. 4e] and the above-described operation.

(1) The terminal selects the N beams having the highest filtered signal strength among the output of the previous step, that is, among the layer 1 filtering results for each M base station beams, and identifies the signal strengths for the N beams

A. Here, the information about N may be notified by the base station to the terminal through an RRC message, system information, PBCH (Physical Broadcast Channel), and the like. In addition, information about M may be specified in the standards on which the base station and the terminal are based.

B. In addition, N may be directly selected by the UE instead of being notified by the base station to the UE.

(2) In step (1), the UE selected N beams. However, there is a possibility that a beam that is not suitable for deriving cell quality is included among the selected N beams. Therefore, the UE selects a beam unnecessary for deriving cell quality based on their signal strength from among the selected N beams.

A. Here, the UE may determine a beam that is not suitable for deriving cell quality based on a threshold. That is, the UE may determine that a beam having a signal strength smaller than a threshold among the N beams selected in step (1) is not suitable for deriving cell quality.

i. That is, when the signal strength of a specific beam a is expressed as RSRPa, if beam a satisfies RSRPa < threshold, it is determined that beam a is not suitable for deriving cell quality.

ii. Here, the threshold information may be informed by the base station to the terminal through an RRC message, system information, PBCH, and the like. In addition, information on thresholds may be specified in standards based on the base station and the terminal.

B. As another method, the UE may determine a beam that is not suitable for deriving the cell quality based on the offset. That is, the UE compares the RSRP of the beam having the largest signal strength among the N beams selected in step (1) with the RSRP of the remaining beams. As a result of the comparison, it can be determined that beams having RSRP smaller than offset dB compared to RSRP of the beam having the largest signal strength are not suitable for deriving cell quality.

i. That is, when the signal strength of beam x having the largest signal strength is expressed as RSRPx and the signal strength of beam y selected in step (1) is expressed as RSRPy, beam y satisfying RSRPx - RSRPy > offset dB is cell quality It is determined that the beam is not suitable for deriving .

ii. Here, the information on the offset may be informed by the base station to the terminal through an RRC message, system information, PBCH, and the like. In addition, information about the offset may be specified in the standard based on the base station and the terminal.

(3) In step (1), N beams with high signal strength were selected, and in step (2), unnecessary beams were excluded in determining cell quality based on threshold or offset. In step (3), among the beams selected in step (1), averaging, summing, or weighted averaging of signal strengths is performed on the remaining beams except for the beam selected in step (2) to determine cell quality. That is, if there are a total of r beams excluding the beam selected in step (2) among the beams selected in step (1), the derived cell quality is as follows.

A. When cell quality is derived through average

i. RSRPcell = (RSRP1 + RSRP2 + RSRP3 + … + RSRPr)/r

B. When cell quality is derived through summation

i. RSRPcell = RSRP1 + RSRP2 + RSRP3 + … + RSRPr

C. When cell quality is derived through weighted sum

i. RSRPcell = w1*RSRP1 + w2*RSRP2 + w3*RSRP3 + … + wr*RSRPr

[Fig. 4f] and [Fig. 4g] show a flowchart of a method in which the UE selects some of a plurality of base station beams using an absolute threshold value and a relative offset value to derive cell quality.

4H is a diagram illustrating the structure of a terminal according to an embodiment of the present invention.

Referring to FIG. 4H , the terminal may include a transceiver 4h-01, a controller 4h-02, and a storage 4h-03. In the present invention, the controller may be defined as a circuit or an application specific integrated circuit or at least one processor.

The transceiver 4h-01 may transmit/receive a signal to/from another network entity. The transceiver 2510 may receive, for example, system information from a base station, and may receive a synchronization signal or a reference signal.

The controller 4h-02 may control the overall operation of the terminal according to the embodiment proposed in the present invention. For example, the controller 4h-02 may control a signal flow between blocks to perform an operation according to the above-described flowchart.

The storage unit 4h-03 may store at least one of information transmitted/received through the transmission/reception unit 4h-01 and information generated through the control unit 2520 .

4I is a diagram illustrating the structure of a base station according to an embodiment of the present invention.

Referring to FIG. 4I , the base station may include a transceiver 4i-01, a controller 4i-02, and a storage 4i-03. In the present invention, the controller may be defined as a circuit or an application specific integrated circuit or at least one processor.

The transceiver 4i-01 may transmit/receive signals to and from other network entities. The transceiver 4i-01 may transmit, for example, system information to the terminal, and may transmit a synchronization signal or a reference signal.

The controller 4i-02 may control the overall operation of the base station according to the embodiment proposed in the present invention. For example, the controller 2620 may control a signal flow between blocks to perform an operation according to the above-described flowchart.

The storage unit 4i-03 may store at least one of information transmitted/received through the transmission/reception unit 4i-01 and information generated through the control unit 4i-02.

The terminal device may include a transceiver for transmitting and receiving signals with other terminals, and a control unit for controlling all operations of the terminal device. It may be understood that all operations for synchronization support described above in the present disclosure are performed by the controller. However, the controller and the transceiver do not necessarily have to be implemented as separate devices, and may be implemented as a single component in the form of a single chip.

It should be noted that the configuration diagram of a terminal, an example of a control/data signal transmission method, an example of an operation procedure of a terminal, and a configuration diagram of a terminal device exemplified in the drawings are not intended to limit the scope of the present disclosure. That is, all components, entities, or steps of operation described in the drawings should not be construed as essential components for the implementation of the disclosure, and even including only some components will be implemented within a range that does not impair the essence of the disclosure. can

The operations of the base station or the terminal described above can be realized by providing a memory device storing the corresponding program code in an arbitrary component in the base station or the terminal device. That is, the control unit of the base station or the terminal device may execute the above-described operations by reading and executing the program code stored in the memory device by a processor or a central processing unit (CPU).

The various components and modules of the entity, base station or terminal device described in this specification include a hardware circuit, for example, a complementary metal oxide semiconductor-based logic circuit, and firmware. and software and/or hardware circuitry, such as a combination of hardware and firmware and/or software embedded in a machine-readable medium. As an example, various electrical structures and methods may be implemented using electrical circuits such as transistors, logic gates, and application-specific semiconductors.

Meanwhile, although specific embodiments have been described in the detailed description of the present disclosure, various modifications are possible without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure 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 (12)

In the method of a terminal in a communication system,
Receiving, from the base station, measurement configuration information including at least two or more pieces of neurology information, at least two pieces of bandwidth information, information on a threshold, and information on a maximum number of reference signals used to acquire cell quality;
measuring a plurality of reference signals based on the at least two pieces of neurology information and the at least two pieces of bandwidth information;
obtaining the cell quality based on a priority of a neurology and an average of one or more measurement results equal to or greater than the threshold value among a plurality of measurement results for the plurality of reference signals; and
Transmitting a measurement report including the cell quality to the base station,
and a number of the one or more measurement results averaged to obtain the cell quality is less than or equal to the maximum number. According to claim 1,
The method of claim 1, wherein the one or more measurement results are associated with a pneumology having a highest priority. According to claim 1,
Each of the at least two pieces of bandwidth information includes information on a size of a measurement bandwidth and information on a starting point of the measurement bandwidth. A method of a base station in a communication system, comprising:
Transmitting, to the terminal, measurement configuration information including at least two or more pieces of neurology information, at least two pieces of bandwidth information, information on a threshold, and information on the maximum number of reference signals used to acquire cell quality;
transmitting a plurality of reference signals to the terminal based on the at least two or more pieces of neurology information and the at least two pieces of bandwidth information; and
Receiving, from the terminal, a measurement report including the cell quality,
wherein the cell quality is obtained based on a priority of the numerology and an average of one or more measurement results equal to or greater than the threshold value among a plurality of measurement results for the plurality of reference signals.
and a number of the one or more measurement results averaged to obtain the cell quality is less than or equal to the maximum number. 5. The method of claim 4,
The method of claim 1, wherein the one or more measurement results are associated with a pneumology having a highest priority. 5. The method of claim 4,
Each of the at least two pieces of bandwidth information includes information on a size of a measurement bandwidth and information on a starting point of the measurement bandwidth. In the terminal of a communication system,
transceiver; and
connected to the transceiver,
Receive, from the base station, measurement configuration information including at least two or more pieces of numerology information, at least two or more bandwidth information, information about a threshold, and information on the maximum number of reference signals used to obtain cell quality,
Measuring a plurality of reference signals based on the at least two or more of the neurology information and the at least two or more of the bandwidth information,
obtaining the cell quality based on the priority of the neurology and the average of one or more measurement results equal to or greater than the threshold value among a plurality of measurement results for the plurality of reference signals,
At least one processor for transmitting a measurement report including the cell quality to the base station,
The terminal, characterized in that the number of the one or more measurement results averaged to obtain the cell quality is less than or equal to the maximum number. 8. The method of claim 7,
The one or more measurement results are terminal, characterized in that it is associated with a numerology having the highest priority. 8. The method of claim 7,
The at least two pieces of bandwidth information each include information on a size of a measurement bandwidth and information on a starting point of the measurement bandwidth. In a base station of a communication system,
transceiver; and
connected to the transceiver,
At least two or more pieces of numerology information, at least two or more bandwidth information, information on a threshold value, and measurement configuration information including information on the maximum number of reference signals used to obtain cell quality are transmitted to the terminal,
Transmitting a plurality of reference signals to the terminal based on the at least two or more neurology information and the at least two or more bandwidth information,
At least one processor for receiving, from the terminal, a measurement report including the cell quality,
The cell quality is obtained based on a priority of the numerology and an average of one or more measurement results that are equal to or greater than the threshold value among a plurality of measurement results for the plurality of reference signals,
and a number of the one or more measurement results averaged to obtain the cell quality is less than or equal to the maximum number. 11. The method of claim 10,
The base station, characterized in that the one or more measurement results are associated with a pneumatology having the highest priority. 11. The method of claim 10,
The at least two pieces of bandwidth information each includes information on a size of a measurement bandwidth and information on a starting point of the measurement bandwidth.

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