KR102521218B1 - Apparatus and method for power saving for cellular internet of things devices - Google Patents

Abstract

The present disclosure relates to a communication technique and a system for converging a 5G communication system with Internet of Things (IoT) technology to support a higher data transmission rate after ^{a 4th} generation (4G) system. This disclosure provides intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, health care, digital education, retail, security) based on 5G ( ^5th generation) communication technology and IoT-related technology. and safety related services). A method of operating a terminal located within a designated area in a wireless environment includes transmitting registration information for registering in a network to a base station connected to the network, wherein the registration information indicates that the designated area is covered by the base station. It includes information indicating that it is included in the area, and includes a process of communicating with the base station based on the registration information.

Description

APPARATUS AND METHOD FOR POWER SAVING FOR CELLULAR INTERNET OF THINGS DEVICES

The present disclosure relates to a cellular Internet of Things (IoT) device, and more particularly, to an apparatus and method for power saving of a cellular IoT device with limited mobility.

Efforts are being made to develop an improved 5th generation ( ^5G ) communication system or a pre-5G communication system in order to meet the growing demand for wireless data traffic after the commercialization of a 4th generation (4G ⁾ communication system. For this reason, the 5G communication system or pre-5G communication system has been called a Beyond 4G Network communication system or a Post LTE system. In order to achieve a high data rate, the 5G communication system is being considered for implementation in a mmWave band (eg, a 60 gigabyte (60 GHz) band). In order to mitigate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-high frequency band, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used in 5G communication systems. ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, to improve the network of the system, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud RAN), and an ultra-dense network , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation etc. are being developed. In addition, in the 5G system, Advanced Coding Modulation (ACM) methods such as FQAM (Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation) and SWSC (Sliding Window Superposition Coding) and advanced access technology FBMC (Filter Bank Multi Carrier) ), Non Orthogonal Multiple Access (NOMA), and Sparse Code Multiple Access (SCMA) are being developed.

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

In this disclosure, both IoT devices and cellular IoT (CIoT) devices are referred to. However, the techniques described in this disclosure are not limited to the IoT devices and CIoT devices, and may be implemented in other user devices or terminal devices such as smart phones and tablet computers. The number of IoT devices may vary depending on the cost effectiveness of providing a means to charge/change the battery or mains power connection. Also, battery life of the IoT devices may not require frequent replacement. The cellular network of the CIoT devices requires some of the battery usage of the CIoT devices, and it is required to reduce power consumed by cellular communication in the CIoT devices.

Based on the above discussion, the present disclosure provides an apparatus and method for power saving using mobility indication information and a mobile communication network connection mode of a cellular internet of things (CIoT) device with limited mobility. provides

According to various embodiments of the present disclosure, a method of operating a terminal located within a designated area in a wireless environment includes transmitting registration information for registering in a network to a base station connected to the network, and the registration information includes the designated area and information indicating that the base station is included in the coverage area of the base station, and performing communication with the base station based on the registration information.

According to various embodiments of the present disclosure, a base station device connected to a network in a wireless environment includes a transmission/reception unit and a control unit functionally coupled to the transmission/reception unit, wherein the control unit controls the operation of the terminal from a terminal located within a designated area. configured to receive registration information for registration in a network, wherein the registration information includes information indicating that the designated area is included in a coverage area of the base station, and communicates with the terminal based on the registration information is configured to perform

According to various embodiments of the present disclosure, a terminal device located within a designated area in a wireless environment includes a transceiver unit that communicates with a base station connected to a network, and a control unit functionally coupled to the transceiver unit, wherein the control unit , configured to transmit registration information for registering in the network to the base station, wherein the registration information includes information indicating that the designated area is included in a coverage area of the base station, and based on the registration information , configured to perform communication with the base station.

Devices and methods according to various embodiments of the present disclosure may save power by using mobility indication information and a mobile communication network connection mode of a cellular internet of things (CIoT) device.

The effects obtainable in the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below. will be.

For a more complete understanding, the following descriptions are made with reference to the accompanying drawings. Like reference numerals in the drawings indicate like elements.
1 illustrates an example of a long term evolution (LTE) mobile communication network.
2 shows an example of a cooperative ultra-narrow band (C-UNB) communication network.
3 illustrates an example of a cooperative ultra-narrow band (C-UNB) communication network.
4 shows an example of a mobility management procedure in a 3GPP communication network.
5 illustrates an example of a flow of a network disconnected mode (NWDM) setup procedure according to an embodiment.
6 illustrates an example of a mobility management procedure according to an embodiment.
7 illustrates an example flow of an NWDM state transition procedure according to an embodiment.
8 shows an example of a functional block configuration of a terminal device.

Terms used in the present disclosure are only used to describe a specific embodiment, and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art described in this disclosure. Among the terms used in the present disclosure, terms defined in general dictionaries may be interpreted as having the same or similar meanings as those in the context of the related art, and unless explicitly defined in the present disclosure, ideal or excessively formal meanings. not be interpreted as In some cases, even terms defined in the present disclosure cannot be interpreted to exclude embodiments of the present disclosure.

In various embodiments of the present disclosure described below, a hardware access method is described as an example. However, since various embodiments of the present disclosure include technology using both hardware and software, various embodiments of the present disclosure do not exclude software-based access methods.

A mobile terminal (or user equipment (UE)), such as a mobile handset or terminal device, is connected to a base station network or other wireless access points connected to a telecommunications network. BACKGROUND OF THE INVENTION [0002] Wireless or mobile (cellular) communication networks that communicate through connections have been experiencing rapid growth over many generations. The early development of systems using analog signals has been replaced by second generation (2G) digital systems such as the global system for mobile communication (GSM). The 2G digital system generally uses a radio access technology known as GERAN (GSM/EDGE (enhanced data rates for GSM evolution) radio access network) in conjunction with an advanced core network.

The data service of the 2G system has been greatly replaced or increased by the third generation (3G) such as universal mobile telecommunications system (UMTS). 3G digital systems use a universal terrestrial radio access network (UTRAN) radio access technology and a core network similar to the GSM. UMTS has been specified as a standard by the 3rd generation partnership project (3GPP). The 3G standard provides more throughput than the data throughput provided by second generation systems. The trend continues as it moves to the fourth generation (4G) and fifth generation (5G).

3GPP designs, specifies and standardizes technologies for mobile wireless communication networks. More specifically, 3GPP provides a series of TRs (technical reports) and TSs (technical specifications) defining the technologies of the 3GPP. Currently, the interest of 3GPP is standardization beyond 3G, and more specifically, a standard for an advanced radio access network called "E-UTRAN" and an evolved packet core (EPC). E-UTRAN uses long term evolution (LTE) radio technology. The LTE radio technology offers greater capacity and additional features compared to previous standards. Although LTE is only mentioned for an air interface, LTE technology is used in all systems including EPC and E-UTRAN. In this sense, LTE is used in the remainder of this disclosure referring to LTE enhancements such as LTE Advanced. LTE is an evolution of UMTS and shares the higher level components and protocols of UMTS. LTE Advanced provides higher data rates compared to LTE. LTE Advanced is defined by 3GPP standards including 3GPP Release 10 to 3GPP Release 12. LTE Advanced is considered a 4G mobile communication system by the International Telecommunication Union (ITU).

1 shows an example of an LTE mobile communications network.

Referring to FIG. 1 , system 100 may correspond to an LTE mobile communication network structure. The system 100 includes higher level components. The higher level components include user equipment (UE) 102, E-UTRAN 104 and EPC 106. The EPC 106 or core network communicates with packet data networks (PDNs) servers 108 . For example, the PDNs server 108 may form the Internet.

Figure 1 shows some of the components of EPC 106 to simplify the system 100, and the implementation of the system 100 requires more components. 1 illustrates interfaces between different components of the system 100. Double-headed arrows shown in FIG. 1 indicate a radio interface between the UE 102 and the E-UTRAN 104. Other interfaces for user data appear as solid lines. Signaling procedures are represented by dashed lines.

The E-UTRAN 104 or radio access network (RAN) includes a single type of component. The component includes an eNB (E-UTRAN Node B). The eNB controls wireless communication between the UE 102 and the EPC 106 through a radio access interface. The eNB controls the UE 102 in one or more cells. The system 100 is a cellular system in which the eNB provides coverage for one or more cells corresponding to a geographical coverage area. In general, there are multiple eNBs in an LTE system. When a terminal performs LTE communication with one eNB through one cell at a predetermined time, the eNB may be referred to as a base station or a mobile base station.

1 shows the main components of the EPC 106. The system 100 includes one or more various components depending on the number of UEs 102, the geographic area of the network, and the amount of data transmitted over the network. Data traffic passes between the eNB and a serving gateway (S-GW) 110 corresponding to the eNB. The S-GW 110 routes data between the eNB and a PDN gateway (P-GW) 112. The P-GW 112 connects the terminal 102 to one or more servers, ie, the PDNs 108 . A mobile management entity (MME) 114 exchanges signaling messages with the UE 102 through the E-UTRAN 104 . The MME 114 controls higher level operations of the UE 102 using the signaling message. UE 102 is registered with a single MME. There is no direct signaling path between the MME 114 and the UE 102 (ie, the MME 114 communicates with the UE 102 through the E-UTRAN 104). The signaling message between the MME 114 and the UE 102 includes an EPS session management (ESM) protocol message and an EPS mobility management (EMM) protocol message. The ESM protocol message controls the flow of data transmitted from the UE 102 to the outside. In addition, the EMM message controls data flow and signaling rerouting when the UE 102 moves between a plurality of eNBs included in the E-UTRAN. The MME 114 exchanges signaling traffic with the S-GW 110 to assist in routing data traffic. The MME 114 also communicates with a home subscriber server (HSS) 116 . The HSS 116 stores user information registered in the network.

In addition to the structures described above, the system 100 further includes the concept of a bearer. In particular, the EPS bearer means a specific bearer through which data is transmitted and received from the UE 120 . The EPS bearer is formed from an e-radio access bearer (e-RAB) and an S5/S8 bearer. The e-RAB is formed between the UE 102 and the EPC 106 . The S5/S8 bearer is formed within the EPC 106. The EPS bearer defines a process by which user data transmitted and received in the system 100 is controlled. Also, when the user data passes through the system 100, the EPS bearer defines the user data. The system 100 may be expressed as a virtual data pipe formed through the core network. A bearer may have the quality of the service related to the service. For example, the quality of the service may mean bitrate. The bearer provides channel packet data to a packet data network (PDN, also called a public data network) outside the system 100 through the S-GW 110 and the P-GW 112 . A non-LTE external carrier requires the channel data to be transmitted from the EPC 106 to an external network. Therefore, each bearer is associated with a PDN, and all data associated with the bearer passes through a specific P-GW. Each bearer may be identified by a logical channel ID (LCID) at a medium access control (MAC) level. That is, one bearer corresponds to one logical channel.

In a 3GPP network based on LTE and LTE Advanced, a terminal device includes two operation modes. The first is RRC_Idle (radio resource control_Idle) mode, and the other is RRC_Connected mode. In the RRC_Idle mode, the terminal device does not communicate user plane data with the network. However, when downlink data is transmitted, the terminal device periodically monitors a paging channel to be notified by the network. As a result, there is no non-access stratum (NAS) signaling between the terminal device and the network in the RRC_Idle mode. However, a PDN connection exists between the terminal device and the network, and the terminal device is registered with the MME. In addition, the MME can know the location of the terminal device through area update tracking. Conversely, in the RRC_Connected mode, the terminal device is allocated resources for either uplink or downlink. The terminal device transmits/receives data in the allocated resource or is expected to transmit/receive data. Signaling performed by the terminal device in the RRC_Idle mode is reduced compared to the RRC_Connected mode. However, given the various and regular procedures required to be performed in the RRC_Idle mode, the battery life required for the CIoT device will not be satisfied using only the two operating modes.

Accordingly, various methods for reducing power consumption of electronic devices in a 3GPP network have been proposed. One of the proposed methods is discontinuous reception (DRX) or extended DRX (eDRX) and cooperative ultra-narrow band (C-UNB).

Discontinuous reception (DRX)

DRX is a technology for reducing power consumption of the terminal device by reducing the operating time of the receiver of the terminal device. As described above, in the RRC_Idle mode, the terminal device monitors the paging channel to connect to the network. However, continuously monitoring the paging channel consumes significant power. This is because the monitoring requires receiving signals on one or more channels for each subframe of the radio access interface provided by the network. Therefore, the receiver of the terminal device must be active periodically. In the DRX, the terminal device is configured to negotiate with the mobile communication network instead of monitoring a paging channel or other physical control channel of each frame or subframe. The terminal device enters a DRX cycle of a specific length through the negotiation. In other words, the terminal device monitors the paging or downlink control channel only during the active period of the DRX cycle. The network is configured to transmit a signal to the terminal device only during an active period of the DRX cycle. According to the method, the frequency at which the terminal device monitors the signaling of the network is reduced. For example, the terminal device is configured to monitor the paging channel once every 10 radio frames and enter a sleep-like state (deactivation state). In the sleep-like state, the LTE receiver of the terminal device reduces power between monitoring instances to reduce power consumption. When the network acquires data to be transmitted to the terminal device, the network waits until the next DRX activation period of the terminal device. And, the network transmits a paging message to the terminal device in a DRX activation period of the terminal device. The paging message instructs the terminal device to exit the DRX mode and switch to the RRC_Connected mode in order to receive downlink data.

In the case of a machine type communications (MTC) device, in order to further reduce the power consumption, an extended DRX (eDRX) mode in which the period of the DRX cycle is significantly increased has been proposed in 3GPP TR 45.820 v 1.4.0. Table 1 below shows the eDRX cycles with cycle lengths up to 52 minutes. In other words, in the eDRX, the terminal device monitors the paging channel or other specific channel every 52 minutes. The required eDRX cycle is indicated using a 4-bit EXTENDED_DRX code. An additional code not shown in Table 1 is used to indicate an eDRX cycle with a length not included in Table 1.

eDRX Cycle Value
(EXTENDED_DRX) Target eDRX
Cycle Length Number of 51-MF per eDRX Cycle
(EXTENDED_DRX_MFRMS) eDRX Cycled per TDMA FN Space 0000 ~1.9seconds 8 6656 0001 ~3.8seconds 16 3328 0010 ~7.5seconds 32 1664 0011 ~12.2seconds 52 1024 0100 ~24.5seconds 104 512 0101 ~49seconds 208 256 0110 ~1.63minutes 416 128 0111 ~3.25minutes 832 64 1000 ~6.5minutes 1664 32 1001 ~13minutes 3328 16 1010 ~26minutes 6656 8 1011 ~52minutes 13312 4 Note1: 53248 51-multiframes occur with the TDMA FN space (2715648 TDMA frames)
Note2: All remaining EXTENDED_DRX values are reserved

cooperative ultra narrow band (C-UNB)

Another method of reducing power consumption of Sai terminal devices and CIoT devices is called C-UNB radio access technology (RAT). In the method, the terminal device does not synchronize with the network or the base station (or does not access the network or the base station) before it is permitted to transmit packets to the network. As a result, control signals required to be monitored by the terminal device are reduced. Instead, network access is based on random transmission by the terminal device. The network access is substantially the same as the known ALOHA scheme in a very simple way. The ALOHA method is a wireless transmission protocol, and in the ALOHA method, a terminal device can transmit a packet at any time. However, when the terminal device collides with a message generated from another terminal device, the packet is retransmitted after a predetermined time. However, the packet collision reduces the overall efficiency when the load of the network increases. To solve the above problem, the C-UNB RAT implements two mitigation techniques. The two mitigation techniques are respectively frequency diversity and spatial diversity.

2 shows an example of a C-UNB communication network.

Referring to FIG. 2 , a network 200 includes additional software and servers to implement the C-UNB. For example, the network 200 includes, in addition to the base stations 202, 204, and 206, base station controllers (BSCs) and packet control units (PCUs) 208 and 210, serving HPRS support node (SGSN) 212, and gateway GPRS support node (GGSN) 214 is further included. The network 200 also includes a C-UNB server 216 in the core net. The C-UNB 216 is used to control C-UNB communication in the base stations 202, 204, and 206. More specifically, the C-UNB 216 is configured to combine various data received by spatial diversity and/or frequency diversity.

To provide the spatial diversity, coverage areas of the base stations 202, 204, and 206 must overlap each other. In the overlapped coverage area, the radio access network may receive the same radio packet multiple times from different base stations.

3 shows an example of a C-UNB communication network. 3 illustrates a method of using multiple base stations to achieve spatial diversity.

Referring to FIG. 3 , a terminal device 302 transmits packets to a base station 306 and a base station 310 . To apply the advantage of spatial diversity, the received packets are combined at the C-UNB server 312. Similarly, the terminal device 304 transmits packets to the base station 302 and the base station 310 . The received packets are combined and duplicated in the C-UNB server 312. In order to apply the advantage of the spatial diversity, the C-UNB network structure requires higher complexity. In addition, since the C-UNB network structure does not include an acknowledgment procedure for uplink data packets, reliability of data transmitted to the core network is not high. Moreover, there is no facility for transmitting downlink data to the terminal device using only C-UNB.

Although the use of the eDRX and C-UNB reduces power consumption of the CIoT devices, due to the above problems, it is not easy for the eDRX and the C-UNB to achieve power savings for battery life. For example, in the case of eDRX, the maximum cycle length is not sufficient to transmit data that the terminal device reports every week. In addition, DRX can only reduce a frequency used in a specific procedure such as paging, but cannot change the procedure performed by the terminal device. For example, eDRX can reduce the frequency used in the paging channel, but other procedures of the terminal device, such as mobility management procedures, must still be performed.

4 shows an example of a mobility management procedure in a 3GPP communication network. More specifically, FIG. 4 illustrates the mobility management protocol set forth in 3GPP standard TS 24.008.

For example, referring to FIG. 4 , the terminal device may initiate the MM connection by requesting the network to establish a mobility management (MM) connection. More specifically, the terminal device may request a radio resource (RR) connection by transmitting an MM-connection request message to the network (refer to the upper left protocol of FIG. 4). For another example, after the MM connection is activated, if the connection fails in the lower layer, the terminal device may transmit a connection management (CM) service request message for reconfiguration to the network (lower left of FIG. 4). see protocol). For another example, the terminal device may notify the network of the latest location information of the terminal device by transmitting location update information of the terminal device to the network (refer to the protocol on the right of FIG. 4 ).

Although this disclosure describes some of the overall mobility management protocol procedures, other procedures of the mobility management protocol are also apparent from FIG. 4 . Also, after initial registration of the terminal device, some of the procedures shown in FIG. 4 may not be performed because information is not changed. For example, when the location of the terminal device does not change, regular location information update need not be performed.

In order to reduce resources consumed by mobility management of low mobility devices, high mobility functions as well as MTC low mobility functions are defined in 3GPP TS 22.368. In TR 45.820 v1.4.0, the low mobility is defined as a maximum speed of less than 30 km/h, and the high mobility is defined as a maximum speed of 30 km/h or more. MTC function Low mobility is used for the MTC devices that do not move, do not move often, or move within a specific radius. The MTC function low mobility makes the network operator change the frequency of the mobility management procedure or simplify the mobility management of each MTC device. In addition, the MTC function low mobility allows the network operator to define the frequency of location information updates performed by the MTC devices in order to reduce power consumption and signaling overhead used by user devices.

However, in a manner similar to eDRX and paging or control channel monitoring, the low mobility function only allows location information updates and frequency changes of mobility management procedures, but does not allow completely removing mobility management for low mobility MTC devices. don't As a result, since the mobility management procedure is performed even when the CIoT devices do not move or move only within a certain radius, the unnecessary mobility management procedure consumes radio resources and reduces the battery life of the CIoT devices.

Limited Mobility of IoT Devices

As described above, in a mobile network based on the current 3GPP standard, mobility management assumes that electronic devices connected to the network have mobility and can be classified into low mobility and high mobility. However, the above classification does not consider stationary terminal devices. In addition, the classification does not consider a terminal device that does not move between cells (ie, a geographic coverage area of a base station to which the terminal devices are connected). Therefore, the functions of the mobility management of the 3GPP network do not reflect efficient use of non-mobile terminal devices (eg, CIoT devices in a smart home). In the present disclosure, devices newly classified as “limited mobility” refer to devices initially registered with the network. The CIoT devices (or other devices) indicate to the network that the CIoT devices have "limited mobility", which is an alternative to low mobility or high mobility. In addition, the CIoT devices indicate to the network that the location of the CIoT devices (ie, location relative to a cell) does not change or does not change relatively frequently. In other words, the CIoT devices move within the same cell as the cell of the current base station and do not change the cell communicating with the network. In addition, the limited mobility may mean that a designated area where the CIoT devices are located is included in the coverage area of the base station. According to the mobility indicator indicating the "limited mobility", the terminal device and the network may perform various procedures. For example, the terminal device and the network may perform mobility management in consideration of a non-changing state of the terminal device. Mobility management considering the non-changing state of the terminal device can reduce unnecessary overhead and power consumption generated by the terminal device.

When the terminal device performs registration with the network for the first time, registration information representing various parameters is sent to the network. The registration information may include a classmark. The classmark represents expected mobility of the terminal device. The registration information may be transmitted every hour according to the current 3GPP standard. However, according to the present disclosure, the classmark may additionally indicate "limited mobility" meaning that the terminal device has fixedness within the same cell in addition to the above information. For example, the classmark may include bit information shown in Table 2 below.

Bits Mobility class 00 Limited Mobility 01 Low mobility (=< 30km per hour) 10 High mobility (> 30 km per hour) 11 Reserved for future use

Unlike low mobility and high mobility, the limited mobility indicator indicates mobility associated with a cell. In other words, the limited mobility indicator indicates the coverage area and cell boundary of the base station rather than the speed of the terminal device. Accordingly, the network can know whether the terminal device will perform inter-cell movement. The method may be applied to a scenario in which the terminal device moves around the house regardless of speed and does not change cells. Also, the method can be applied to a terminal device having a generally fixed moving speed.

Through the additional mobility information, since the network presupposes that the terminal device does not change cells, the network can more simply perform a mobility management procedure and a paging procedure.

In the present disclosure, a new operation mode (other than RRC_Idle and RRC_Connected modes) may be defined in the terminal device with the limited mobility. The new operation mode may be referred to as network disconnected mode (NWDM). The NWDM may appear in the RRC_Idle mode, and it is assumed that the terminal device is currently not registered with the network. The NWDM mode is preferentially used for electronic devices that communicate with the network relatively infrequently. However, the NWDM mode may also be used for other arbitrary electronic devices.

In the NWDM mode, the terminal device may be On (NWDM-On state) or Off (NWDM-Off state). In the NWD-On state, the terminal device may not communicate with the network. Conversely, in the NWDM-OFF state, the terminal device can communicate with the network and transmit/receive data. Since switching between the NWDM-On state and the NWDM-Off state can be coordinated with the network, the network may not attempt communication with the terminal device when the terminal device is in the NWDM-On state. When the terminal device is switched to the NWDM-Off state, the receiver of the terminal device is in a power-on state, and the terminal device starts communication with the network. When the terminal device with limited mobility transitions from the NWDM-On state to the NWDM-Off state, fewer signaling procedures are required than when switching from the DRX to the RRC_Connected mode. For example, when the terminal device switches from the NWDM-On state to the NWDM-Off state, location information update is not required. Accordingly, power consumption of the terminal device is reduced compared to power consumption of the terminal device in the DRX. In addition, when the terminal device is in the NWDM-Off state, the terminal device is disconnected from the network, but the core network determines the connection context (PDN connection, IP address, etc.) of the terminal device and the maintain registration. Accordingly, when the terminal device attempts to reconnect with the network, the terminal device may perform fewer procedures.

When the terminal device switches from the NWDM-On state to the NWDM-Off state, a plurality of alternative formats may be applied to communication between the terminal and the network. For a first example, the terminal device may be pre-allocated with uplink resources in a specific frame. The assignment is performed before the terminal device enters the NWDM-On state. The network may recognize that the terminal device is scheduled to switch between the NWDM-On state and the NWDM-Off state. Accordingly, when the terminal device enters the NWDM-Off state, the terminal device can transmit/receive data with the network in the pre-allocated resources.

For a second example, the terminal device may be pre-allocated with downlink resources in a specific frame. The assignment is performed before the terminal device enters the NWDM-On state. The network may recognize that the terminal device is scheduled to switch between the NWDM-On state and the NWDM-Off state. Accordingly, when the terminal device enters the NWDM-Off state, the terminal device can transmit/receive data with the network in the pre-allocated resources.

For a third example, instead of the terminal device directly transmitting/receiving data with the network after the terminal device switches to the NWDM-Off state, the terminal device uses downlink or uplink resources allocated from the network. It is possible to receive indication information and transmit and receive the data. The terminal device may receive a signal from a broadcast channel or other control channel after switching to the NWDM-Off state in order to obtain indication information of the allocated resources. The method may make more resource concentration due to increased signaling, but since the method allows resource allocation to be determined close to the utilization of the resource, the method can provide flexible resource allocation.

For a fourth example, when the terminal device transmits a relatively small volume of data in uplink, the terminal device may use a smart meter. The uplink data may be transmitted on a random access channel such as a physical random access channel (PRACH) of a 3GPP radio access interface. Therefore, since resource allocation signaling is not required before or after switching from the NWDM-On state to the NWDM-Off state, the method does not need to allocate resources dedicated to the terminal device and can reduce overhead. there is.

The use of the NWDM is that the terminal device enters a sleep-type state or a reduced power state (NWDM-On state) while the receiver of the terminal device is turned off and periodically communicates with the network (NWDM-Off state). entails doing For example, a utility smart meter may be required to report to the network on a daily or weekly basis. Also, due to the state of many IoT devices, data usage patterns of the IoT devices can be relatively predictable and periodic. Also, the amount of data transmitted in each communication event may be relatively constant. For example, the utility smart meter may transmit only 5 bits of data representing a reading and an error code.

Therefore, in order for the NWDM to be efficiently configured by the network and the resources to be allocated efficiently, resource use of the terminal device and data transmission frequency indication information are required before the terminal device enters the NWDM. There are advantages offered to

Therefore, according to embodiments of the present disclosure, when the terminal device registers with the network for the first time, in addition to providing mobility indication information as part of registration information to the network, when the terminal device indicates limited mobility , the terminal device may provide a data transmission frequency indicator and/or a resource usage indicator. The resource use indicator indicates data transmission frequency and/or resource use of the terminal device.

The data transmission frequency indicator indicates a specific frequency transmission class or period. The class represents a temporal transmission frequency (eg, minute, hourly, daily, or weekly). The indicator may be transmitted together with the limited mobility indicator included in the classmark (registration information) or may be transmitted after the classmark or other registration information.

Table 3 below provides a plurality of code information representing data transmission frequency classes of CIoT devices. The code information may consist of a larger number of bits or a smaller number of bits, and the time periods may also vary.

Bits Data Transmission Frequency Class 000 10 Mins 001 30 Mins 010 1 Hour 011 6 Hours 100 12 Hours 101 One Day 110 One Week 111 Reserved for Future Use

After the indicator of the data transmission frequency is provided to the network, when the terminal device switches to the NWDM-Off state, the network may allocate the resources and instruct the terminal device a timer value. . The timer value expires when the preallocated resources occur. As a result, the terminal device and the network may have a synchronized timer set at an appropriate period. When the terminal device enters the NWDM-On state, the timer starts, and when the terminal device switches to the NWDM-Off state, the timer expires. Similarly, the core network may include a corresponding timer so that the terminal device can know when the terminal device switches from the NWDM-On state to the NWDM-Off state.

Although Table 3 and the foregoing mention frequency transmission indicators related to time, and it has been described that the timer is used in the terminal device and the network to adjust the NWDM state transition, the NWDM conversion is performed in various ways depending on the implementation method. can be triggered. For example, a change in an environmental parameter such as a climate environment or an alarm message instead of the time indicator may trigger the transition of the NWDM state. Also, a change in the frequency parameter of the network can be used to initiate a transition between the NWDM states. Both the terminal device and the network can recognize and synchronize changes in conditions related to the parameters. In the case of a parameter change not recognized by the network, the terminal device may switch between the NWDM states based on the environmental condition and the parameter change, and then the terminal device informs the network of the change. can tell you The network may maintain a connection context of the terminal devices and provide signaling for the terminal devices until the terminal devices learn that the terminal devices have switched to the NWDM-Off state.

A resource usage indicator (ie, a data volume indicator) may indicate a specific resource usage class. Each class corresponds to the amount of user plane data transmitted and received by the terminal device when the terminal device enters the NWDM-Off state. Based on the indicator, the network can efficiently allocate resources to the terminal device in advance. The terminal device may be provided with resource indication information before entering the NWDM-On state, and reduce transceiver power of the terminal device.

As a data transmission frequency indicator, a number of different classes can be defined based on the amount of data being transmitted. For example, referring to Table 4 below, four different classes are defined. Table 4 shows only four classes, but depending on the implementation method, a number of different classes can be defined based on the amount of data.

Bits data Volume (Bytes) 00 Up to 20 01 Up to 50 10 Up to 200 11 Not Applicable/Variable

In addition to providing a relatively accurate data transmission amount indicator, as shown in the code '11' included in Table 4, the indicator may indicate that the transmission data request amount of the terminal device may vary. Therefore, the resource request will not be negotiated before the terminal device enters the NWDM-On state, but before each data transmission. As the data transmission frequency indicator, the data quantity indicator may be transmitted together with the limited mobility indicator included in the classmark or may be transmitted after the classmark in response to a request received from the network.

Through the data transmission frequency indicator and the data amount indicator, the network can configure the terminal device and NWDM by setting an appropriate timer (or other parameter) and allocating an appropriate amount of resources. Also, the network may inform the terminal device of the parameters. The terminal device may start a synchronized timer and store resource allocation information. Also, the terminal device may enter the NWDM-On state and maintain the NWDM-On state until the timer expires.

When the timer expires, the terminal device may switch to the NWDM-Off mode and use the allocated resources. The allocated resources may be one time allocation. In this case, the allocated resource is provided to the terminal device before the terminal device enters the NWDM-On state. The allocated resources may be the same resources as those allocated whenever the terminal device enters the NWDM-Off state. Although the persistent resource allocation may reduce flexibility in resource allocation, since the persistent resource allocation is required once by the terminal device, the resource allocation may cause signaling overhead reduction.

Device registration and NWDM settings

5 shows an example of the flow of NWDM setup procedure.

Referring to FIG. 5 , in step 502, the terminal device registers with the network according to a suitable method among methods described in the 3GPP standard. For example, the terminal device may receive one or more signals including information related to the base station connected to the network from the base station. Information related to the base station may include information identifying the base station. In addition, the terminal device may receive information required for registration in the network from the base station. The registration procedure assumes that the terminal device is turned on for the first time, but the procedure is performed when synchronization related to NWDM switching between the terminal device and the network is lost, or the terminal device moves to another coverage area. In one case, the terminal device may occur to access the network.

In step 504, the terminal device determines whether the terminal device is a CIoT device with limited mobility. In other words, the terminal device determines whether the terminal device is stationary or does not move to another cell within the coverage area of the current base station. Whether the terminal device is the CIoT device with limited mobility may be determined in various ways according to an implementation method. For example, the terminal device may include the information in advance. For another example, the terminal device may include the information according to a user's input. For another example, the terminal device may determine the information by monitoring a coverage area in which the terminal device is located.

In step 506, when the terminal device does not have the limited mobility, the terminal device may perform a mobility management procedure and a resource allocation procedure as described in the existing 3GPP. In this case, the registration information does not include restricted mobility indication information.

In step 508, if the terminal device has the limited mobility, the terminal device transmits information indicating that the terminal device has the limited mobility to the network. For example, the terminal device may include the indication information in a classmark signal transmitted to the network. Based on the indication information, the network may perform a registration procedure in consideration of limited mobility of the terminal device.

In step 510, the terminal device transmits a transmission data frequency class indicator or other parameters to the network.

In step 512, the terminal device transmits a resource use class to the network. In addition, the terminal device may transmit a clock/timing accuracy class or indication information to the network in step 513 according to an implementation method. The clock/timing accuracy class is used by the network to determine the NWDM timer value.

Although FIG. 5 shows steps 508 to 513 as separate operations, steps 508 to 513 may be performed as one continuous operation or may be performed after being requested by the network. For example, if the terminal device is determined to have limited mobility, all of the various indicators may be included in the classmark signal. In addition, as shown in Tables 2 to 4, the various indicators are formed by relatively small bit information, and the small bit information may be bit information not used in the claamark signal defined in the existing 3GPP standard.

In step 514, the terminal device configures the network and NWDM. In other words, the terminal device receives NWDM parameters from the network. The NWDM parameters are determined by the network based on the data transmission class indicator and the resource use class indicator. The terminal device configures the NWDM mode by initiating and starting a timer. Also, the terminal device stores or records previously allocated resources. Connection parameters of the terminal device may be configured by the network and the terminal device. For example, at least one of authentication, identification, context establishment, PDN connection establishment, and IP address allocation may be performed in step 514 . To generate the NWDM configuration parameters, in step 514, the network may perform a number of decisions. For example, the network may determine resource allocation based on the data resource and the data transmission frequency indicator. For another example, the network may determine a timer value based on the data transmission frequency period and/or the determined resource allocation. The network may also provide other information to the terminal device. For example, the network may provide the terminal device with a synchronization indicator used for synchronizing the timer.

When the NWDM is configured, in step 516, the terminal device determines whether the terminal device is in the NWDM-On state or the NWDM-Off state by checking expiration of a timer. For example, when the terminal device is in the NWDM-On state, the terminal device disconnects from the network in step 516 and does not transmit/receive data with the network. Also, when the terminal device transmits data and starts the timer, the terminal device may enter the NWDM-On state.

If the timer does not operate, in step 518, the terminal device connects to the network and transmits/receives data according to the connection parameters set in step 514.

The configuration of the NWDM requires performing a number of procedures, but FIG. 5 does not show all of the plurality of procedures. For example, after the network receives the frequency indicator and resource use indicator, the network may determine an absolute time value at which the terminal device should exit the NWDM-On state. Also, the network may provide the absolute time value to the terminal device without providing the timer value. The network can determine the NWDM status only for interested terminal devices. For example, since the IoT is made up of many devices, a single cell may contain 100 or 1000 CIoT devices. In this case, in order to reduce potential network congestion and perform load balancing, the network may adjust resource allocation of terminal devices with limited mobility. Due to the adjusted resource allocation, the limited mobility terminal devices may not simultaneously transmit and receive data. For example, it is assumed that a specific cell includes 10 smart meters, and each of the smart meters reports data once a day. In this case, the network can make the 10 smart meters not report the data at the same time by starting the NWDM timer having a period of 1 minute at intervals during the day. In addition, resources for terminal devices that do not transmit and receive time-critical data may be allocated during off-peak hours (eg, evening hours) with relatively low traffic.

As shown in Table 3, the duration of the terminal device in the NWDM-On state may vary depending on the implementation method. For example, when a thermostat reports temperature data every hour, the duration of the NWDM timer may be one hour. As another example, if the smart utility meter reports data every week, the smart utility meter may not transmit/receive a signal to/from the network while the smart utility meter is in the NWDM-On state. For another example, synchronization between the clock of the terminal device and the network may be lost due to clock drift. More specifically, when the terminal device is in the NWDM-On state having a long cycle, each NWDM timer in the terminal device and the network may expire at different times (ie, synchronization may be lost). there is). In this case, the likelihood of a terminal device losing pre-allocated resources due to the synchronization loss may decrease. To reduce the likelihood reduction, a margin of error may be provided when the network and the terminal device set the NWDM timer or when the network provides an absolute time value to the terminal device. For example, if the resource for the terminal device is allocated once a week, the value of the timer may be set to less than 7 days, and the terminal device has a transmission/reception window, so that the NWDM- It can be configured to monitor multiple radio frames when entering the Off state. In the method, as long as possible resources are pre-allocated to the window, the terminal device can access the resources. The method may provide a margin for an NWDM state transition timing error such as deviation of synchronization between the network and the terminal device, and provide an opportunity to reduce the loss of the pre-allocated resource.

Although the term network disconnected mode is used in this disclosure, there are a number of differences between the CIoT device in the NWDM-On state and the conventional device with unlimited mobility disconnected from the network. .

First, when the CIoT device enters the NWDM-On state, the CIoT device retains the context (ie, IP address, PDN connection, assigned S-GW information, etc.) of the CIoT device. On the other hand, since a terminal device disconnected from the network is considered to be no longer registered with the network, the terminal device does not retain the context. Second, when the CIoT device switches from the NWDM-On state to the NWDM-Off state, the CIoT device does not require identification, authentication, or RRC connection request procedures. Instead, the CIoT device performs initial registration procedures with the network, and the procedures are performed when the NWDM mode is set for the first time.

A CIoT device that transitions from the NWDM-On state to the NWDM-Off state performs fewer signaling operations compared to a completely disconnected device. Therefore, the CIoT device can consume less power compared to devices that perform DRX and devices that are disconnected between communication instances.

mobility management signaling

6 illustrates an example of a mobility management procedure according to an embodiment. More specifically, FIG. 6 shows an overview of mobility management signaling occurring in the 3GPP network described with reference to FIG. 1 and 3GPP standard TS24.008. Although FIG. 6 shows all procedures beyond the scope of the present disclosure, matters relevant to the content of the present disclosure correspond to a location tracking procedure indicated by shaded reference numeral 602 on the right side of FIG. 6 .

Referring to FIG. 6 , 3GPP devices and networks are required to perform a mobility management protocol to locate the terminal devices. For example, a paging message is provided to a specific base station, and handover occurs.

In conventional 3GPP devices, the location tracking procedure is performed at regular intervals so that the network knows the current locations of the terminal devices. However, if the terminal device does not move and is stationary, the regular location tracking and updating are unnecessary. In the present disclosure, when the CIoT device has limited mobility, the network may recognize that the CIoT device is stationary and suspend some mobility management procedures. In other words, since the regular location tracking and update signaling described in FIG. 6 is postponed, the communication burden between the network and the CIoT device can be reduced and power consumption can be reduced. However, in order for the network to know the location of the CIoT device, when the CIoT device performs a registration procedure with the network, when the NWDM is configured, or when the CIoT device changes a base station coverage area, the CIoT device The location information of should be provided to the network.

When NWDM-On

As described above, the CIoT device with limited mobility transmits and receives data to and from the network with reduced overhead. When the CIoT device switches from the NWDM-On state to the NWDM-Off state (ie, when reconnecting with the network), a number of signaling procedures are omitted.

7 illustrates an example of a NWDM state transition procedure flow according to an embodiment. More specifically, FIG. 7 illustrates procedures performed when the terminal device switches from the NWDM-On state to the NWDM-Off state.

7 shows a process in which the terminal device communicates with the network, the terminal device communicates with the network through a base station providing a coverage area in which the terminal device is located.

Referring to FIG. 7 , in step 702, the terminal device is in the NWDM-On state and disconnected from the network. The terminal device does not transmit/receive data with the network, but has been registered (eg, authentication, context setting, etc.) with the network. The state of the terminal device in step 702 corresponds to step 520 of FIG. 5 .

In step 704, the terminal device determines whether the NWDM-On timer has expired. If the timer has not expired, the terminal device maintains the NWDM-On state. When the timer expires, in step 706, the terminal device switches to the NWDM-Off state. In step 705, the terminal device may trigger switching to the NWDM-Off state using an external environmental condition without using a difference timer.

In step 706, the terminal device turns on a receiver of the terminal device and monitors (or listens) to at least one channel to acquire synchronization information and downlink signaling transmitted by the network. For example, the terminal device may listen to a broadcast channel (BCCH) and/or a synchronization channel (SCH).

In step 708, the terminal device uses the received synchronization information and broadcast information to synchronize a clock with the network and receive downlink data from the network. The synchronization information and the broadcast information are used to identify the location of an uplink control channel for the terminal device to request uplink resources. The time value for the synchronization may be variously determined according to situations in which the synchronization may be lost. For example, assume that the terminal device has a high-accuracy clock and is in the NWDM-On state of a relatively short cycle. In this case, since the probability of synchronization loss is low, the terminal device can quickly receive the synchronization information and signaling data. As another example, assume that the terminal device has a low accuracy clock and is in the NWDM-On state of a relatively long cycle. In this case, since synchronization loss is highly likely to occur, the terminal device will take a longer amount of time to receive synchronization information and signaling data.

In some embodiments, a margin of error regarding NWDM state transition timing may be provided. The margin is provided to a terminal device having a low accuracy clock and low data transmission frequency. The terminal device may have an increased time period for synchronization and may receive signaling indicating allocated resource information. The margin of error is provided by setting another timer value by the network. According to the above method, the timer may properly expire before a resource allocated to the terminal device is generated.

In step 710, when synchronization is performed, the terminal device determines whether uplink resources have been pre-allocated when configuring the NWDM or based on information obtained from the network in step 708.

If the uplink resource is not pre-allocated, in step 718, the terminal device determines whether to transmit data to the network using a random access channel (RACH). The decision is based on parameters set during the NWDM setup. Also, the determination may be based on the amount of data being transmitted. For example, when a relatively small amount of data is transmitted, in step 720, the terminal device may transmit the relatively small amount of data through the random access channel. On the other hand, when a relatively large amount of data is transmitted, in step 722, the terminal device may request a dedicated resource from the network. Although not shown in FIG. 7, the CIoT may receive the dedicated resource information from the network. The CIoT may transmit the uplink data using the dedicated resource.

In step 724, if the terminal device determines that all uplink data is transmitted through the requested resource, the terminal device performs step 716 if necessary.

When the terminal device determines in step 710 that the uplink resource has been allocated in advance, in step 712, the terminal device transmits data to the network through the allocated resource.

In step 714, the terminal device determines whether all uplink data has been transmitted through the allocated resource. The process of determining whether the uplink data has been transmitted may include a process in which the terminal device receives an ACK/NACK for the transmitted data from the network. When all of the uplink data is transmitted, the terminal device may perform step 716 if necessary.

In step 716, the terminal device determines whether all data transmission and reception have been completed. When all data transmission and reception are completed, the terminal device resets the NWDM timer and enters the NWDM-On state. Here, the timer setting and allocated resources are the same as the timer setting and allocated resources determined when the NWDM is configured. Additionally, when the terminal device and the network re-synchronize the timer, and the terminal device learns the new timer value or parameter and an allocated resource to be newly used after the terminal device switches to the NWDM-Off state , additional negotiation procedures may occur.

In step 726, the terminal device determines whether there is downlink data received based on the signal received in step 708. When it is determined that there is the received downlink data, in step 728 the terminal device receives the downlink data from the network. If the terminal device determines that the downlink data reception is complete in step 730, the terminal device waits for the completion of the uplink data transmission by performing step 716, if necessary. When it is determined that there is no downlink data received, the terminal device performs step 716 and waits for completion of the uplink data transmission.

As shown in FIG. 7 , a procedure for switching from the NWDM-On state to the NWDM-Off state has a lower complexity than when the terminal device registers with the network. Thus, the procedure may provide power savings compared to a terminal device that completely disconnects from the network after each data transmission. In addition, the procedure can provide power savings compared to DRX and eDRX because DRX, location information update, RRC connection request, and paging channel check procedure are not required.

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기" 등의 용어는 적어도 하나의 기능 또는 동작을 처리하는 단위를 의미하며, 상기 용어는 하드웨어, 소프트웨어, 또는 하드웨어와 소프트웨어의 결합을 의미할 수 있다. 8 shows an example of a functional block configuration of a terminal device. used below "

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A term such as "group" means a unit that processes at least one function or operation, and the term may mean hardware, software, or a combination of hardware and software.

Referring to FIG. 8 , a terminal device 800 includes a transmission/reception unit 810, a control unit 820, a storage unit 830, and at least one antenna. For convenience of description, FIG. 8 illustrates the terminal device 800 including only the components, but components may be deleted or new components may be added according to various implementation methods. In addition, for convenience of explanation, although FIG. 8 shows that each component includes one element, at least two or more components may be included according to various implementation methods. For example, the terminal device 800 may include two or more transmission/reception units 810, two or more control units 820, or two or more storage units 830.

The transceiver 810 is configured to perform a function of processing signals transmitted and received. In some embodiments, the transceiver 810 is configured to perform various operations for processing a transmission signal in a baseband. For example, the transceiver 810 may be configured to perform modulation based on a modulation method according to a communication system. The modulation scheme is a code division multiple access (CDMA), a wideband code division multiple access (WCDMA), an orthogonal scheme (eg, orthogonal frequency division multiplexing (OFDM)), a non-orthogonal scheme ( For example, in addition to filter bank multi-carrier (FBMC), Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), Filter Bank Multi Carrier (FBMC), Non Orthogonal Multiple Access (NOMA) , and sparse code multiple access (SCMA).

In some other embodiments, the transceiver 810 is configured to perform various operations for transmitting the transmission signal processed in the baseband as a radio frequency (RF) signal. For example, the transceiver 810 may be configured to filter an RF signal processed in the baseband and converted into an analog signal by a digital analog converter (DAC) based on a transmission band. For another example, the transceiver 810 may be configured to up-convert the RF signal. Signal power of the up-converted RF signal is amplified by a power amplifier (PA). The amplified RF signal is transmitted through an antenna included in the terminal device 800 .

Depending on the implementation method, the transceiver 810 is configured to perform an operation for receiving a signal. When the terminal device 800 performs an operation for receiving a signal, the transceiver 810 may be configured to filter and down-convert a signal received through an antenna, and transmit the down-converted signal to a base It can be configured to demodulate in band.

The controller 820 may include a single processor core or may include a plurality of processor cores. In some embodiments, the controller 820 may include a multi-core such as a dual-core, quad-core, or hexa-core. In some other embodiments, the controller 820 may further include an internal or external cache memory.

The controller 820 may be functionally combined with other components to perform various functions of the terminal device 800 . In some embodiments, the controller 820 is configured to control the transceiver 810 to process a signal to be transmitted. In some other embodiments, the controller 820 is configured to store, read, or load the received signal or data in the storage 830 .

In some other embodiments, the control unit 820 is configured to transmit registration information for registering in the network to the base station, wherein the registration information is information indicating that the designated area is included in a coverage area of the base station Including, based on the registration information, it may be configured to perform communication with the base station.

The storage unit 830 may include at least one of volatile memory and nonvolatile memory. The non-volatile memory includes read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM), flash memory, phase-change RAM (PRAM), magnetic RAM (MRAM), and RRAM. (resistive RAM), ferroelectric RAM (FRAM), and the like. The volatile memory includes various types such as dynamic RAM (DRAM), static RAM (SRAM), synchronous DRAM (SDRAM), phase-change RAM (PRAM), magnetic RAM (MRAM), resistive RAM (RRAM), and ferroelectric RAM (FRAM). It may include at least one of the memories. In addition, the storage unit 830 may include a nonvolatile medium such as a hard disk drive (HDD), a solid state disk (SSD), an embedded multimedia card (eMMC), or a universal flash storage (UFS). there is.

Although FIG. 8 shows functional building blocks of the terminal device 800, the components shown in FIG. 8 may perform overall operations of a base station connected to the mobile communication network depending on an implementation method. In some embodiments, the control unit 820 is configured to receive, from a terminal located within a designated area, registration information for registering the terminal in the network, wherein the registration information indicates that the designated area is covered by the base station ( coverage) area, and may be configured to perform communication with the terminal based on the registration information.

Methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software. When implemented in software, a computer readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in a computer-readable storage medium are configured for execution by one or more processors in an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

Such programs (software modules, software) may include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM. (EEPROM: Electrically Erasable Programmable Read Only Memory), magnetic disc storage device, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other forms of It can be stored on optical storage devices, magnetic cassettes. Alternatively, it may be stored in a memory composed of a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

In addition, the program may be performed through a communication network such as the Internet, an Intranet, a Local Area Network (LAN), a Wide LAN (WLAN), or a Storage Area Network (SAN), or a communication network composed of a combination thereof. It can be stored on an attachable storage device that can be accessed. Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port. In addition, a separate storage device on a communication network may be connected to a device performing an embodiment of the present disclosure.

In the specific embodiments of the present disclosure described above, elements included in the disclosure are expressed in singular or plural numbers according to the specific embodiments presented. However, the singular or plural expressions are selected appropriately for the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components, and even components expressed in plural are composed of the singular number or singular. Even the expressed components may be composed of a plurality.

Meanwhile, in the detailed description of the present disclosure, specific embodiments have been described, but 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 not be defined by the scope of the claims described below as well as those equivalent to the scope of these claims.

Claims (20)

In the operating method of a terminal located within a designated area in a wireless environment,
identifying a mobility class of the terminal among limited mobility, low mobility, and high mobility;
If the checked mobility class is limited mobility, first information used for registration of the terminal and indicating the limited mobility and second information for determining at least one parameter for NWDM (network disconnected mode) are transmitted to the core network and Transmitting to a connected base station;
receiving at least one parameter for NWDM determined based on the second information; and
Controlling the connection with the base station according to the state of the NWDM identified based on the at least one parameter,
The limited mobility is selected when the terminal is stationary in the cell of the base station regardless of the speed of the terminal,
The low mobility indicates that the speed of the terminal is lower than a threshold value,
The high mobility indicates that the speed of the terminal is higher than the threshold value,
The connection with the base station is connected while NWDM is off, and disconnected while NWDM is on,
While the terminal is disconnected from the base station according to the NWDM, registration of the terminal is maintained in the core network,
Wherein the first information allows the base station to configure NWDM for the terminal.
delete The method of claim 1,
The second information indicates at least one of a transmission frequency of uplink data, a resource available to the terminal, or a clock/timing accuracy of the terminal,
The at least one parameter includes at least one of a transmission period of the uplink data, a timer value for changing a state of the NWDM, or an allocation resource for the uplink data.
The method of claim 1,
The process of controlling the connection with the base station,
In response to expiration of a timer that starts when the NWDM enters the on state, switching from the on state of the NWDM in which the terminal is disconnected from the base station to the off state of the NWDM in which the terminal is connected to the base station. .
The method of claim 1,
The process of controlling the connection with the base station,
Further comprising using resources to transmit uplink data to the base station while the terminal is in an off state of NWDM connected to the base station,
The resource is identified by the at least one parameter or allocated by a request of the terminal after entering the off state.
The method of claim 1,
The process of controlling the connection with the base station,
The method further comprises transmitting uplink data to the base station by using a random access channel (RACH) while the terminal is in an off state of NWDM connected to the base station.
delete delete In a base station device connected to a network in a wireless environment,
transceiver and
including at least one processor functionally coupled to the transceiver;
The at least one processor,
If the terminal identifies the mobility class of the terminal among limited mobility, low mobility, and high mobility, first information used for registration of the terminal and indicating limited mobility, and at least one for network disconnected mode (NWDM), from the terminal Receiving second information for determining a parameter of
Transmitting at least one parameter for NWDM determined based on the second information;
The limited mobility is selected when the terminal is stationary in the cell of the base station device regardless of the speed of the terminal,
The low mobility indicates that the speed of the terminal is lower than a threshold value,
The high mobility indicates that the speed of the terminal is higher than the threshold value,
The connection with the terminal is controlled to be connected or disconnected according to the state of the NWDM identified based on the at least one parameter,
The connection with the terminal is connected while NWDM is off, and disconnected while NWDM is on,
While the terminal is disconnected from the base station device according to the NWDM, registration of the terminal is maintained in the core network,
The first information causes the base station device to configure NWDM for the terminal.
delete The method of claim 9,
The second information indicates at least one of a transmission frequency of uplink data, a resource available to the terminal, or a clock/timing accuracy of the terminal,
The at least one parameter includes at least one of a transmission period of the uplink data, a timer value for changing a state of the NWDM, or an allocation resource for uplink data.
delete The method according to claim 9, wherein the at least one processor,
Using resources, configured to receive uplink data from the terminal while the terminal is in an off state of NWDM connected to the base station device,
The resource is identified by the at least one parameter or allocated by a request of the terminal after entering the off state.
The method according to claim 9, wherein the at least one processor,
An apparatus configured to receive uplink data from a terminal using a random access channel (RACH) while the terminal is in an off state of NWDM connected to the base station apparatus.
delete In a terminal located within a designated area in a wireless environment,
transceiver and
including at least one processor functionally coupled to the transceiver;
The at least one processor,
Checking the mobility class of the terminal among limited mobility, low mobility and high mobility;
If the checked mobility class is limited mobility, first information used for registration of the terminal and indicating the limited mobility and second information for determining at least one parameter for NWDM (network disconnected mode) are transmitted to the core network and transmit to the connected base station,
Receiving at least one parameter for NWDM determined based on the second information;
Depending on the state of the NWDM identified based on the at least one parameter, controlling the connection with the base station;
The limited mobility is selected when the terminal is stationary in the cell of the base station regardless of the speed of the terminal,
The low mobility indicates that the speed of the terminal is lower than a threshold value,
The high mobility indicates that the speed of the terminal is higher than the threshold value,
The connection with the base station is connected while NWDM is off, and disconnected while NWDM is on,
While the terminal is disconnected from the base station according to the NWDM, registration of the terminal is maintained in the core network,
The first information causes the base station to configure NWDM for the terminal.
delete The method of claim 16
The second information indicates at least one of a transmission frequency of uplink data, a resource available to the terminal, or a clock/timing accuracy of the terminal,
The at least one parameter includes at least one of a transmission period of the uplink data, a timer value for changing a state of the NWDM, or an allocation resource for the uplink data.
The method of claim 16
The at least one processor,
A terminal that switches from an on state of NWDM in which the terminal is disconnected from the base station to an off state of NWDM in which the terminal is connected to the base station in response to expiration of a timer that is started when the terminal enters the on state of the NWDM.
The method according to claim 19, wherein the at least one processor,
Using resources, the terminal transmits uplink data to the base station while the terminal is in an off state of NWDM connected to the base station,
The resource is identified by the at least one parameter or allocated by a request of the terminal after entering the off state.

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