KR20130100716A - Methods for managing mobile equipment in heterogeneous network - Google Patents

Abstract

PURPOSE: A terminal managing method in a heterogeneous network environment is provided to improve performance of a mobile communications system and to efficiently control interference. CONSTITUTION: A base station (500) determines whether to control measurement of a terminal. The base station generates measurement information for the measurement of the terminal based on determination regarding whether to control the measurement of the terminal. The measurement information is generated by performing at least one measuring operation of channel state information (CSI) measurement, radio resource management (RPM) measurement, measurement for finding a device to device (D2D) terminal and measurement for D2D communications. The base station provides generated measurement information to the terminal through a control message.

Description

How to manage a terminal in a heterogeneous network environment {METHODS FOR MANAGING MOBILE EQUIPMENT IN HETEROGENEOUS NETWORK}

The present invention relates to a packet-based mobile communication system, and more particularly, to a terminal management method for supporting mobility management and low power operation of a terminal in a heterogeneous network environment.

In a packet-based cellular mobile communication system, mobility management is to maintain continuity of a connection of a radio bearer (RB), which is a logical channel established between a source base station and a terminal.

In the general mobility management method, the terminal establishes a connection to a control channel through preliminary information exchange between a source base station originally receiving a service and a target base station to provide a service through a new connection according to the movement of the terminal. After the terminal accesses the target base station and establishes a connection to the data channel, it uses a backward handover procedure of releasing the connection with the source base station.

In particular, various types of base stations, such as a macro base station, a narrow or micro base station, a home base station, a closed subscriber group (CSG) cell, or a remote radio head (RRH) In a heterogeneous network (Hetnet) environment in which a cell or transmission point coexists, ping-pong handovers frequently occur between adjacent base stations / cells, thereby increasing the load on the system and cell boundaries. There is a problem in that the quality of the wireless channel due to the interference in the radio wave and a radio link failure (RLF) occurs accordingly, thereby degrading the performance of the overall mobile communication system.

In addition, in order to improve the performance of a mobile communication system, a mechanical type communication that generates traffic such as a smart phone or an intermittent small amount of data such as IM (Instant Message) traffic or smart metering (MTC: Machine Type Communication) For terminals or terminals generating a small amount of data at long intervals, a signal according to a message transmission of the terminals or a state transition of the terminals (for example, a transition between a connected state and a dormant state). There is a need for a method that can reduce ring overhead and minimize power to the terminal.

In addition, terminals that support device-to-device communication (D2D) function are required to measure the presence or absence of communication with neighboring terminals, and thus, measurement setting and measurement for direct communication between terminals are required. Improvements in measurement procedures such as performance, measurement reporting, and methods and control procedures for measurement triggering are required.

Meanwhile, CoMP (Coordinated Multi Point Transmission and CoMP), in which a plurality of base stations, cells, or transmission nodes located at the same or different geopolitical point, cooperate to provide a service for improving performance of a terminal located at a cell boundary in a packet-based cellular mobile communication system. reception function is considered. CoMP is a CoMP function provided by one or more narrow base stations in a wide area base station with any relatively large service area, a CoMP function provided between two or more wide area base stations, and a CoMP provided by two or more wide area base stations and their narrow base stations. It can be divided into functions.

In addition, the CoMP function is a Joint Processing (JP) method in which a plurality of transmitting nodes transmit the same packet information together, and a coordinated CS / CB (CS / CB) that supports a plurality of transmitting nodes to minimize interference at one transmitting node. Scheduling / Beamforming).

In general, the JP method is a method in which a plurality of transmitting nodes transmit the same information using the same modulation and coding method using the same radio resource (meaning that a radio resource composed of the same frequency band and transmission time is allocated to a CoMP target terminal).

In the CS / CB method, a plurality of transmission nodes share information for radio resources, modulation and encoding, and transmit data to an arbitrary terminal through an optimal radio resource, modulation and encoding method, and provide a service and radio resources through interference control. Pre-coding matrix indicator considering the related information (e.g., the size of the interference signal, the signal size of the serving cell and the adjacent cell (s), and the adjacent cell (s) among the plurality of transmission nodes to be allocated. It is controlled by exchanging optimal transmission and encoding information).

The JP method may be classified into a joint transmission (JT) method from a downlink view from a base station to a terminal and a joint reception (JR) method from an uplink view from a terminal to a base station. In addition, the JP method may include a dynamic cell selection (DCS) or a dynamic point selection (DPS) method for dynamically selecting transmission nodes participating in CoMP.

In the DCS / DPS method, among a plurality of cells or points configured to participate in CoMP, at any transmission time in consideration of radio channel quality, load status of a base station, transmission or reception power of a base station and a terminal, and interference state, etc. Performance is improved by selecting an optimal point (or cell).

As described above, in order to improve the performance of a mobile communication system in a heterogeneous network environment in which a plurality of base stations cooperate to provide a service and support a carrier aggregation (CA) function, one or more base stations and terminals may be used. It is required to improve the measurement operation and DRX (Discontinuous Reception) operation control procedure required for the connection control of the. In addition, in order to improve the performance of the system, it is necessary to improve the mobility control procedure of the terminal, a machine type communication (MTC) terminal, a terminal for generating traffic having various profiles, and a terminal for supporting a direct communication function between terminals. Improvements in measurement methods and control procedures to minimize power consumption of the terminal are required.

An object of the present invention for solving the above problems is to improve the performance of the mobile communication system, to effectively control the interference, to ensure the continuity of services, and to improve the power consumption performance of the terminal It is to provide a terminal management method in a heterogeneous network environment.

Terminal management method in a heterogeneous network environment according to an aspect of the present invention for achieving the above object of the present invention, a terminal management method performed in a base station, the step of determining whether the measurement control of the terminal, and the determined measurement Generating measurement information for measurement of the terminal based on whether the control is performed; and providing the generated measurement information to the terminal through a control message.

The determining of the measurement control of the terminal may include determining whether the terminal is in a connected, idle, or limited connection state as a condition of determining whether the terminal is in measurement control, or collecting a carrier in the terminal. Aggregation) may determine whether to provide a service, determine the information or request content received from the terminal, determine the movement state of the terminal, or determine the type of the terminal.

The generating of the measurement information for the measurement of the terminal may include channel state information (CSI) measurement, radio resource management (RRM) measurement, measurement for discovery of a device to device (D2D) terminal, and measurement for D2D communication. Measurement information for performing at least one measurement operation may be generated.

The generating of the measurement information for the measurement of the terminal may include setting channel state information (CSI) measurement, radio resource management (RRM) measurement, measurement for discovery of a D2D terminal, and measurement for D2D communication for each frequency. Alternatively, measurement information may be set differently for each cell.

The generating of the measurement information for the measurement of the terminal may generate at least one measurement information of a measurement target device, a measurement target parameter, a measurement period, a measurement report period, a measurement event entry, and a measurement event release condition. .

The generating of the measurement information for the measurement of the terminal may generate the measurement information by linking the measurement report period of the terminal with the DRX (Discontinuous Reception) operation period of the terminal.

The determining of whether the measurement control is performed may be performed as a condition for changing the operation of the terminal, when there is no data exchange with the terminal for a preset first time, when a measurement related event does not occur during the preset second time. When the variation range of the measurement report value is within a preset range for a preset third time, when it is determined that the mobility management of the terminal is not necessary, when the terminal requests a change according to a manual setting of the user and the terminal It may be determined whether the measurement report value provided from the case satisfies at least one of the predefined reference values.

The generating of the measurement information may include at least one of measurement and measurement report operation change, measurement and measurement report parameter change, DRX operation change, and DRX operation parameter change of the terminal when at least one of the operation change conditions of the terminal corresponds. Measurement information for indicating one can be generated.

In the determining of whether the measurement control is performed, operation level information defining an operation of the terminal may be provided from the terminal. The generating of the measurement information may set a parameter for at least one of a measurement operation and a DRX operation of the terminal based on the provided operation level information of the terminal.

Here, the operation level information of the terminal is a first measurement mode in which the terminal performs the measurement and measurement report operation according to the set measurement parameters, the terminal at least satisfies the measurement and report operation while satisfying the service quality of the radio bearer is set A second measurement mode performed by the terminal, a third measurement mode in which the terminal selectively performs a measurement operation, a first DRX mode in which the terminal does not perform a DRX operation, and the terminal performs a DRX operation according to a set DRX parameter The terminal may indicate at least one of a second DRX mode and a third DRX mode in which the terminal performs a DRX operation to minimize power consumption of the terminal.

In addition, the terminal management method in a heterogeneous network environment according to another aspect of the present invention for achieving the object of the present invention is a management method of a terminal performed in the terminal, determining whether the measurement change request event occurs, and measuring If a change request event occurs, transmitting a message requesting a change of a measurement operation to a base station.

The determining of whether the measurement change request event occurs may include: when a user of the terminal changes a setting, when a set timer expires, or when at least one event occurs due to a movement state estimation. It may be determined that the measurement change request event has occurred.

In this case, when an event based on the movement state estimation occurs, when the strength of a signal transmitted from the base station is lower than a preset threshold or when the terminal moves out of a specific area based on location information of the terminal, the movement It may be determined that an event by state estimation has occurred.

Here, in the transmitting of the message requesting the change of the measurement operation to the base station, the request message requesting to stop the measurement and the measurement report, restart the measurement and the measurement report or change the measurement parameter may be transmitted.

Here, in the transmitting of the message requesting the change of the measurement operation to the base station, operation level information defining the operation of the terminal may be transmitted to the base station.

Here, the operation level information may be configured to define the operation level for the measurement and the measurement report of the terminal or the DRX (Discontinuous Reception) operation level of the terminal.

Here, the operation level information for the measurement and measurement report of the terminal, the measurement operation activation / deactivation information, the threshold for the measurement event entry and release conditions, the threshold for the timer for measurement management, the measurement event triggering threshold, It may include information on at least one of an adjustment value for adjusting measurement event triggering, a timer value for triggering measurement or measurement report performance, a measurement period, a measurement report period, a measurement target frequency, and measurement target cell shape information.

The information defining the DRX operation level of the terminal may include at least one of a DRX cycle, a period for monitoring control information, a timer for the DRX operation, and activation / deactivation information of the DRX operation.

According to the method for managing a terminal in a heterogeneous network environment as described above, in a heterogeneous network environment in which a plurality of base stations cooperate to provide a service and a CA, and a heterogeneous network environment supporting a CA, a measurement operation required for connection control between one or more base stations and a terminal is required. And DRX operation control procedures, thereby improving system performance.

In addition, by providing a control procedure for mobility management and low-power operation of the terminals in a network environment providing services to the MTC terminal, D2D terminal and the terminal generating the traffic having various profiles, it is possible to improve the transmission speed of the mobile communication system It is possible to improve the interference control or interference avoidance performance, to ensure the continuity of services, and to reduce the power consumption of the terminal.

1 is a conceptual diagram illustrating an example of a heterogeneous network to which a terminal management method according to an exemplary embodiment of the present invention is applied.
2 is a conceptual diagram illustrating another example of a heterogeneous network to which a terminal management method according to an exemplary embodiment of the present invention is applied.
3 is a message flow diagram illustrating a procedure for determining a measurement operation of a terminal in a terminal management method according to an embodiment of the present invention.
4 is a message flow diagram illustrating a procedure for determining a DRX operation of a terminal in a terminal management method according to an embodiment of the present invention.
5 is a conceptual diagram illustrating a network environment to which a terminal management method according to an exemplary embodiment of the present invention is applied.
6 is a message flow diagram illustrating an AP discovery procedure of a terminal in a terminal management method according to an embodiment of the present invention.
7 is a message flowchart illustrating a handover procedure when a terminal is in a logged-in state in the terminal management method according to an embodiment of the present invention.
8 is a conceptual diagram illustrating a configuration example of a heterogeneous network including a cloud base station to which a terminal management method according to an embodiment of the present invention is applied.
9 is a conceptual diagram illustrating mobility management of a terminal in a heterogeneous network environment considering a small cell in a terminal management method according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate the understanding of the present invention, the same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

In the embodiments of the present invention described below, a node or point is a base station, a wide area base station, a narrow base station, a NodeB, an eNodeB, a cell, a femto cell, a femto base station, a home cell, a home in a mobile communication system. It may mean one of a base station (Home (e) NB), a remote wireless node, a remote radio head (RRH), a CSG cell, and a relay. In addition, in the embodiments of the present invention, each node or point refers to a transmitting node or a transmission point in downlink (ie, a terminal receives a signal) according to a signal transmission viewpoint, even if not described separately in a CoMP operation situation. In terms of uplink (ie, a terminal transmits a signal), this means a receiving node or a receiving point.

In the heterogeneous network environment according to the embodiments of the present invention, the method for managing a terminal may include a plurality of geolocation base stations and various types of narrow base stations in a heterogeneous network environment. CoMP function of the base stations of the cooperation to provide services, and services in various types of terminals, such as MTC terminal or smart phone, and supports direct communication between the terminals, serving base station, neighboring base station or peripheral By providing measurement opportunities for terminal devices and providing parameters for mobility management and low power consumption operation of the terminal, it improves the transmission speed of the mobile communication system, improves interference control and interference avoidance performance, and continuity of service. To ensure the power consumption of the terminal It provides a way to reduce the.

1 is a conceptual diagram illustrating an example of a heterogeneous network to which a terminal management method according to an exemplary embodiment of the present invention is applied, and illustrates a configuration of an intra-eNB base station and a service scenario of a terminal in a heterogeneous network environment.

Referring to FIG. 1, the heterogeneous network may include a wide area base station (or eNB: Evolved-UTRAN Node B) 110, a plurality of narrow base station 120, and a plurality of remote wireless nodes 130. A service may be provided to a terminal that supports various functions such as the user terminals 151, 153, 155, and 157, the MTC terminals 161, 163, and 165.

Within the wide area base station 110, there may be one or more narrow base station 120 and one or more remote wireless nodes 130. Depending on the configuration of the network, the one or more narrow base station 120 or one or more remote wireless nodes 130 may be configured to have the same cell identifier as the wide area base station 110, or the cell of the wide area base station 110. It may be configured to operate using a cell identifier different from the identifier.

However, even when the at least one narrow base station 120 or the at least one remote wireless node 130 existing in the wide area base station 110 is configured to have the same cell identifier as that of the wide area base station 110, the DCS / For the purpose of DPS operation, interference control between the remote wireless nodes 130, or configuration and discrimination of feedback information from the terminal, it is necessary to identify the narrow base station 120 or the remote wireless node 130. Apply a separate identifier to the radio node 130, a reference symbol (RS) pattern for distinguishing the narrow base station 120 or the remote wireless node 130, a pattern or scramble for the pilot symbol (pilot symbol) Signal patterns and the like can be applied. For example, different patterns may be applied to the NRF 120 or the remote wireless node 130 using the transmission position, transmission frequency band, transmission interval or period, transmission repetition period, or masking signal sequence of the corresponding symbol or signal. can do.

The terminals may transmit and receive a single point and packet information in a heterogeneous network environment in which the regional base station 110, the narrow base station 120, and the remote wireless node 130 coexist, and transmit or receive data with a plurality of points. You may. Here, the point means one of the wide area base station 110, the narrow base station 120 or the remote wireless node 130, the transmission point, receiving point or transmission and reception according to connection management and parameter setting for packet information transmission. It can work as a point.

For example, in a heterogeneous network environment, a user terminal 151 may establish a logical connection (for example, an RRC (Radio Resource Control) connection of an LTE system) and exchange packet information with the wide area base station 110. have. In addition, there may be a user terminal 155 that establishes a connection with the global base station 110 and exchanges packet information through the remote wireless node 130. In addition, there may be a user terminal 153 that transmits or receives packet information through two points, which are composed of the regional base station 110 and the narrow base station 120 through the CoMP function, and the two narrow base station 120 or two. There may be a user terminal 157 that transmits or receives packet information through the two remote wireless nodes 130.

In the Intra-eNB environment as shown in FIG. 1, the user terminal basically controls the connection of a radio bearer regardless of the location or number of points that transmit or receive packet information. For example, it performs control and management for establishing a connection, maintaining and changing a connection with a wide area base station 110 or a primary transmission node having an RRC layer) function of the LTE system.

Meanwhile, the user terminal 153 may directly transmit and receive data to and from the adjacent user terminal 157 by using a direct communication function between terminals, and if necessary, the regional base station 110 or the narrow base station 120. Control information related to the direct communication between the terminal can be received from. In this case, the control information related to the direct communication between the terminals is, for example, radio resources (wireless subframe configuration information, modulation and encoding information, allocated frequency band and transmission timing information, etc.) used for direct communication between terminals, and adjacent terminals. May include discovery channel information, or configuration information and parameters for neighbor terminal measurement.

In addition, the MTC terminal 163 installed in the vehicle or supporting the mobility function includes a mobility function control, a parameter setting for performing measurement and a control function, and data transmission through the remote wireless node 130 or the wide area base station 110. You can get services. Here, some MTC terminal 161 may be capable of direct communication using the direct communication function between the user terminal 151 and the terminal, as well as the global base station 110. The direct communication between terminals between the MTC terminal 161 and the user terminal 151 may be configured to be limitedly applied only when the user sets in advance.

In addition, some MTC terminal 165 may be configured to receive a service by accessing an adjacent remote wireless node 130 instead of the global base station 110 to reduce power consumption of the terminal, the remote wireless node 130 is inactive (deactivate or disable), or barring (barring) or other reasons, if the service can not be provided through the adjacent remote wireless node 130, the adjacent user terminal (153, 155) using the direct communication function between the terminals It may be configured to be provided with a service through or directly connected to the regional base station 110.

2 is a conceptual diagram illustrating another example of a heterogeneous network to which a terminal management method according to an exemplary embodiment of the present invention is applied, and illustrates a configuration of an inter-eNB base station and a service scenario of a terminal in a heterogeneous network environment.

Referring to FIG. 2, the heterogeneous network may include a plurality of wide area base stations (or eNBs) 210 and 220, a plurality of narrow base station stations 231 and 233, and a plurality of remote wireless nodes 241 and 243. A service may be provided to a terminal supporting various functions such as the user terminals 251 to 256 and the MTC terminals 261 and 262.

In the inter-eNB environment as shown in FIG. 2, connection control for the user terminals 251 to 256 and the MTC terminals 261 and 262 is performed by each of the regional base stations 210 and 220 belonging to their own service area. Perform on terminals.

However, at the boundary point between points such as the user terminal 251 located at the boundary point of the service area of each of the regional base stations 210 and 220, and the narrow base station or the remote wireless node managed by each of the regional base stations 210 and 220, respectively. In case of supporting the CoMP function for the user terminals 254 located or the points managed by the respective regional base stations 210 and 220 and the user terminals 252, 253 and 255 at the boundary points with other eNBs, two wide areas are supported. The base stations 210 and 220 may exchange control information to determine the global base station to perform the connection control with the points to participate in the CoMP operation.

In addition, the determined primary eNB establishes or allocates a radio control channel for transmitting control signaling information such as control parameter setting, control information, and feedback information, and transmits radio bearer or signaling information for data transmission. A connection control such as connection establishment / maintenance / change of a signaling radio bearer for the like is performed. In addition, the master wide area base station can measure and report on points for CoMP operation, resource allocation and scheduling (including generation and transmission of physical downlink control channel (PDCCH) information, configuration of feedback information, etc.), and radio bearer connection control. Proactively determine and carry out such procedures.

Meanwhile, the MTC terminal 261 located at the boundary point of the service area of the two regional base stations 210 and 220 and having a mobility function or installed in an automobile (including an interface for connecting a terminal only) is the user terminal 251. In accordance with the two broadband base station (210, 220) or adjacent to the narrow base station 233 may be provided with the necessary services, using a direct communication function between the terminal using the adjacent user terminal 251 and the wireless channel data You can also send and receive.

In addition, the MTC terminal 262 located at the boundary point between the narrow base station 231, 233 or the remote wireless node managed by the wide area base station 210, 220 may be adjacent to the narrow base station (or remote) according to the user terminal 254. Wireless nodes) 231 and 233 or two wide area base stations 210 and 220, which are closer to the wide area base station 210, to transmit and receive data. Alternatively, the MTC terminal 262 may transmit / receive data using a wireless channel with an adjacent user terminal 252 using a direct communication function between terminals according to a network or a setting of the terminal.

Case consisting of a heteroaryl Genius network environment, the 3GPP (3 ^rd Generation Partnership Project) - based mobile communication system described through 1 and 2, a wide area base station (e) NB ((Evolved) Node B) or macro (macro) (e) NB, where a remote radio node is a radio protocol layer 3 (e.g., RRC layer of LTE system) such as a wide area or narrow base station, and a radio protocol layer 2 (e.g. RLC (Radio Link Control) of LTE system) / MAC (Medium Access Control (MAC) layer) functions include only some of the functions, or radio (node) radio module (RF) module function including the antenna, such as RRH, or even some of the baseband (baseband) area function It may mean.

In addition, the narrow base station illustrated in FIGS. 1 and 2 includes (e) an RRC layer function and an RLC / MAC layer function that manages the same radio resource allocation function as the NB or the wide area base station, and the connection control of the radio bearer established between the base station and the terminal. Although it has a wireless protocol function including a function, it means a micro cell or a pico cell having a small service area due to a relatively low transmission power, a femto cell, a home cell (Home (e) NB). ) May mean a Closed Subscriber Group (CSG) cell.

In heterogeneous network environments, there are various types of base stations such as wide area base stations, narrow base stations, remote wireless nodes, home base stations, CSG cells, etc., and various terminals such as MTC terminals, smart phones, and non-smart mobile terminals. Determine base station to lead connection control such as whether CoMP function is supported, whether direct communication between terminals is supported, type of service being provided or measurement / measurement report of terminal and parameter setting for DRX operation under network management .

The determined base station performs connection control such as connection establishment / maintenance / change of a data transmission radio bearer for providing a service or a signaling radio bearer for transmission of control signaling information.

In addition, the base station performs physical layer control channel allocation for transmission of control signaling information (resource allocation information for scheduling, transmission of feedback information, etc.), and modulation and coding according to a radio channel situation (MCS: Modulation and Coding Scheme). Measurement for channel quality indication (CQI) reporting for determining the level, serving cell for supporting mobility function and measurement for neighbor cells, and neighboring terminal for supporting direct communication function between terminals (e.g., user A terminal, an MTC terminal) may be configured to set various measurement functions such as measurement for searching or discovering for each frequency or for each cell.

In addition, the primary base station may activate or enable only some measurement functions among the various measurement functions described above, or perform control on deactivation or disable to stop the measurement functions. Function and parameter setting for the measurement operation (measurement measurement, measurement report) and DRX operation are determined according to a mechanism separate from the information obtained by the base station, or the request of the terminal (configuration parameter value and range, function activation / deactivation, or The primary base station may determine the information bit) indicating the combination of functions.

As described above, the functions of the measurement operation can be classified as follows.

-Channel State Information (CSI) measurement: A measurement for reporting Channel Quality Indication (CQI) .In data transmission, wireless data such as modulation and coding levels and retransmission methods such as HARQ (Hybrid Automatic Repeat reQuest) are transmitted. Measurement and measurement reporting to ensure transmission reliability

-RRM (Radio Resource Management) measurement: Measurement and measurement reporting function to support the mobility function, performs measurement and measurement report operation for the serving cell and neighbor cells (same frequency or different frequency as the serving cell), serving cell In addition, events for measurement of neighbor cells of the same frequency, neighbor cells of different frequencies, and base stations of different types may be independently set, and each event entry / release is a reference value (or threshold value) for a measurement parameter, a reference timer. Can be set and controlled using information.

D2D discovery measurement: A measurement for discovering a neighboring terminal to support a direct communication function between terminals. The existence of the terminal in a wireless channel environment regardless of whether information received from a base station or location information is used. Measurements and measurement reporting actions performed to check for availability.

-D2D communication measurement: In order to transmit and receive actual data between terminals using direct communication function between terminals, it estimates radio channel quality between terminals and modulates and encodes level based on radio channel quality estimated at data transmission, HARQ Measurement and measurement report operation to secure transmission reliability in a wireless section such as a retransmission scheme.

The network considers the capability of the terminal using the control signaling information transmitted by the base station or the initial (or basic) setting information of the terminal before the terminal first accesses the mobile communication network or before the terminal releases the connection with the network. By limiting the type of base station to which the terminal preferentially connects (a wide area base station, a narrow base station, a remote wireless node, a CSG cell, a home base station, etc.), it is possible to set.

In addition, a connection state in which the terminal establishes / maintains a logical connection for service or control signaling with any base station, a idle state in which the terminal does not establish a logical connection with the base station, or Although the terminal has not established a logical connection for service or control signaling with the base station, it is only valid for a limited connection (e.g., during a certain time interval (or period) or a condition that satisfies a restricted condition for direct communication between terminals). The measurement operation such as the CSI measurement, the RRM measurement, the D2D discovery measurement, the D2D communication measurement, etc. may be selectively set or in the form of some combination of measurements.

In addition, when the base station supports a carrier aggregation function using a plurality of frequencies, the measurement operation of the terminal may be set differently according to each frequency. That is, whether or not to activate / deactivate each measurement operation to be performed by the terminal may be configured differently for each frequency.

For example, in a heterogeneous network environment, when a wide area base station uses f1, f2, f3 frequencies and a narrow base station uses f1, f3, a terminal supporting CA function or CoMP function uses a CA function using f1 and f3 frequencies. Alternatively, the CoMP function can be used to provide services from regional base stations and / or narrow base stations. At this time, a terminal receiving a service from a wide area base station (or a narrow base station) in a connected state by using a CA function may use a frequency of a primary cell (for example, f1) and a secondary base station (Secondary cell) for a CA. The measurement operation may be performed on the frequencies (eg, f2 or f3).

Meanwhile, the main base station of the terminal may separately set the CSI measurement for scheduling resource allocation and the RRM measurement operation for mobility management. For example, the RRM measurement and the CSI measurement may be performed together with respect to the frequency of the primary base station, and the CSI measurement may be configured only with respect to the frequency of the secondary base station.

In addition, the primary base station may control the RRM measurement or the CSI measurement operation in the activated or deactivated mode as determined to be necessary or at the request of the terminal. For example, it may be activated to perform the RRM measurement for the frequency of the primary base station, and may be deactivated to stop performing the CSI measurement for the frequency of the primary or secondary base station.

The base station may control to stop (deactivate) RRM measurement on the frequency of the base station of the base station, if necessary, by using a request from the terminal or information received from the terminal. In particular, when a terminal accesses a narrow base station and receives a service, a request of the terminal using the mobility state estimation information of the terminal or determining that the terminal has little mobility (or manual setting of the user) Accordingly, the RRM measurement can be deactivated and only the CSI measurement can be activated to minimize the measurement operation of the terminal for mobility management, thereby reducing the power consumption of the terminal. Activating or deactivating each CSI, RRM, D2D discovery or D2D communication measurement operation according to the mobile state estimation information of the terminal can be applied without limitation according to the type of accessing base station. Each measurement operation can be controlled according to the determination.

In particular, the fixed MTC device (eg, MTC device for metering) without mobility can be controlled to operate by deactivating the RRM measurement operation by default. In addition, the fixed MTC device may be configured to disable CSI measurement and transmit by applying a preset modulation and coding scheme.

For example, when installing a fixed MTC device or registering a fixed MTC device to a network, measurement or reporting among RRM or CSI measurement operation and reporting operation procedures using control messages (eg, RRC message or MAC message). You can selectively disable the operation and procedure for.

On the other hand, the terminal while maintaining a logical connection (for example, RRC connection) for service or control signaling between the terminal and the base station, the serving base station and the neighboring base station (the same frequency or neighboring frequency as the serving base station to support the mobility function) Perform measurements). The terminal performs measurement according to the measurement target (for example, frequency, measurement signal) and measurement report parameters set by the base station through a separate control message, and then reports the measurement result to the base station. In this case, the measurement signal may be a pilot symbol or a reference signal (RS) which is periodically transmitted on a physical channel. For example, the measurement signal may include a cell-specific reference signal (CRS), a channel state information-RS (CSI-RS), a remote radio head-RS (RSH) defined to distinguish the RRH, and a UE-specific-RS. (RS defined to distinguish terminals), and the like, and the frequency of occurrence (eg, sub-frame interval, number of transmission sub-frames) and frequency on the time axis in consideration of the number of antennas. Location (eg, sub-carrier interval, number of transmission sub-carriers), the number of RS symbols, and the like.

The base station notifies the terminal of parameters of the measurement target base station (or measurement frequency), measurement parameters, measurement period, measurement report period, measurement event entry and release conditions through a control message, and the terminal measures measurement related parameters provided from the base station. Perform the measurement according to the report and report the measurement result.

The base station may display the measurement target base station using a base station identifier, and the measurement target frequency may be displayed using a frequency index (or identifier) defined in the system for setting a parameter for a measurement operation of the terminal. The result measured by the terminal may be expressed as a reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), channel state information (CSI) field information, or channel quality indicator (CQI) field information. Can be.

In addition, the base station determines a reference value, a threshold value or an offset value for a separate measurement target, a threshold value for at least one timer for measurement management, and a measurement according to each measurement operation to set a measurement event entry and release condition. Thresholds for event triggering or adjustment values associated with measurement event triggering, timer values for triggering measurement or measurement reporting, and the like.

Also, the base station sets the measurement period and the measurement report period in units of sub-frame, radio frame, ms (millisecond), or sec (second) when the measurement period and the measurement report period are periodic. Can be. Here, the base station can improve the DRX operation performance by setting the measurement report period to align the multiple of the DRX operation period and the measurement report period in association with the DRX (Discontinuous Reception) operation period. In addition, the measurement period and the measurement reporting period, when the conditions for entering and / or releasing the measurement event for mobility management are satisfied, the ratio of performing the measurement and / or measurement report when the event occurs regardless of the set measurement period or measurement reporting period It may be set in an aperiodic manner.

The terminal in the RRC connected state that requires the DRX operation and the measurement operation for measurement and measurement report has no data exchange between the base station and the terminal for a predetermined time or the base station determines that the RRC connection is not necessary for the operation efficiency. The RRC connection may be released and the terminal may be controlled to transition to the idle state. In addition, as described above, the base station selectively deactivates each measurement operation and DRX operation performed by the terminal without using the terminal transition to the idle state by using the terminal request or the measurement report result provided from the terminal, or measures and DRX operations. It can be controlled to lower the power consumption of the terminal through a level change or a related parameter change. Such control may be determined by the base station in consideration of a terminal request (or user manual setting), information collected from the terminal, a load state of the base station, and the like.

For example, when a terminal transitions from a connected state to a dormant state, new data is generated, a base station update (cell update), routing area (RA) / local area (LA) update, or measurement report (SON (Self Optimization Network) / MDT ( In order to avoid the overload of the signaling procedure required when performing the transition from the dormant state to the RRC connected state for reasons such as minimization driving test (measurement information, location information), the base station performs a DRX operation and a measurement / measurement report operation. By deactivating or changing related parameters, the terminal can be controlled to maintain the RRC connection state while minimizing the power consumption of the terminal without transitioning to the idle state.

That is, in order to efficiently utilize radio resources such as a control channel occupied for minimizing power consumption of the terminal and reporting a measurement, the base station switches to DRX operation when the base station satisfies at least one of the following conditions. -Switch between DRX operation and DRX operation) and stop / disable measurement / measurement reporting operation or change the relevant parameters.

-If there is no data exchange between the base station and the terminal for a preset time,

-If no measurement related event occurs during the preset time,

-If the variation (or deviation) of the measurement report value is within the preset level for a preset time,

-If it is determined that the mobility management of the terminal is not necessary according to the estimation result of the mobile state,

-When the user requests a change through manual setting of the terminal,

-The measurement report value satisfies a predefined level (eg threshold)

On the other hand, in addition to the conditions described above, the base station and the terminal according to the preset method DRX operation cycle (for example, DRX cycle or on-duration timer, inactivity timer, DRX operation related timers such as retransmission timer) and measurement It can also be configured to extend the measurement reporting cycle.

That is, when the above conditions are met or the conditions set separately are met, the DRX operation period and the measurement / measurement reporting period may be set longer than before. For this purpose, the base station transmits a separate control message to the terminal to switch the DRX operation. And to stop (or deactivate) measurement / measurement reporting or to extend the DRX cycle or measurement / measurement reporting period.

The base station and the terminal do not exchange the data between the base station and the terminal to determine the measurement report suspension (or deactivation) or the measurement report period extension as described above, and the time that the RRC connection is maintained or the measurement related event does not occur. You can define a timer that defines a time interval and set its value variably.

In addition, in order to determine a measurement report stop or a measurement report period extension, a measurement report value variation range (or deviation) reported from the terminal, a measurement report level, a measurement report threshold value, and the like may be defined and variably set. The timer value, deviation, and threshold values used as parameters for determining the measurement report stop or measurement report period extension may be set through a control message and may be used as a triggering criterion for the measurement report stop or extension operation. In addition, the control message for signaling that informs the measurement report stop or measurement report cycle extension or indicates the measurement report stop operation or measurement report cycle extension may be, for example, an RRC control message or a MAC control message (control PDU). Alternatively, a physical layer control channel may be used.

On the other hand, even if the terminal is instructed to stop the measurement report or extended measurement report period through the above-described method, even if the RRC connection is maintained, the measurement operation or the measurement report operation is stopped or the measurement report according to the extended measurement report period Can be performed. However, while the terminal stops the measurement operation or the measurement report operation or performs the measurement report operation according to the extended measurement report period, the terminal receives a control message indicating data reception from the base station or generates information to be transmitted from the terminal to the base station. In this case, the measurement and measurement report operation may be set based on a control message (eg, measObjectToAddModList, reportConfigToAddModList) previously set. In other cases, a reset procedure through a control message for a measurement and measurement report period may be applied at the time of exchanging data between the base station and the terminal.

In addition to the method of deactivating the measurement operation as described above, a method for reducing power consumption of the terminal. When the operation level of the terminal is defined and the terminal reports information on the operation level to the base station, the base station measures according to the operation level reported from the terminal. A method for reducing power consumption of a terminal may be applied by setting and transmitting a parameter for an operation or a DRX operation to a terminal and performing a measurement operation or a DRX operation corresponding to a parameter received by the terminal.

For example, when the terminal is receiving power from an external source such as charging or the like, the relevant parameter may be set without a limitation on the measurement operation or the DRX operation. Alternatively, when the battery of the terminal is low or when the terminal (or user's setting) request is made, parameters related to the measurement operation and the DRX operation may be set to operate the terminal with minimum power. That is, it can be set to perform different measurement operation and DRX operation according to the operation level of the terminal.

The operation level of the terminal may be set separately from the measurement operation and the DRX operation level, or may be set to one operation level by combining the measurement operation and the DRX operation level.

First, in the case of setting the measurement operation and the DRX operation can be set as follows.

[Measurement operation level]

-Normal measurement mode: Measures and reports according to measurement parameters set to efficiently support the quality of service or mobility management provided by the terminal.

-Power optimization measurement mode: The quality of service of a wireless bearer with a connection established at a level that allows the occurrence of a handover failure (HOF) or a radio link failure (RLF). Perform minimal measurement and reporting actions with minimal satisfaction.

Minimum measurement mode: cell (e.g., primary cell (Pcell), secondary cell (Scell), adjacent cell, etc.) or frequency (same frequency, different frequency, co-band frequency, adjacent in CA environment) Depending on the band frequency, whether the frequency band is concatenated, etc., the overall operation of the RRM measurement or the CSI measurement or the actual operation is disabled even if some of the measurements are not selectively set or set.

 [DRX operation level]

-Non-DRX mode: The terminal does not perform the DRX operation because the terminal is receiving power from the charging device or the battery of the terminal is low enough that low power consumption is not required.

-Normal DRX mode: Performs DRX operation according to the DRX parameter set according to the quality of service of the radio bearer to which the connection is established.

Power optimization DRX mode: DRX operation is performed by setting the DRX parameter to maintain the connection while minimizing the quality of service of the configured radio bearer and to minimize the power consumption of the terminal.

On the other hand, the operation level of the terminal can be set as follows in the case of setting the operation level without distinguishing between the measurement operation and the DRX operation level to set as one operation level.

-Normal operation mode: Operates according to measurement and DRX parameters set to efficiently support the quality of service or mobility management provided by the terminal.

Power sub-optimization mode of operation: connection of radio bearers established at a level that allows the occurrence of handover failure (HOF) or radio link failure (RLF) while minimizing power consumption of the terminal. Perform an action to keep it.

Power optimization operation mode: In order to minimize the power consumption of the terminal, selectively limit the RRM measurement or CSI measurement operation in whole or in part, if necessary, while minimizing the quality of service of the set radio bearer. Deactivate) to operate. For example, a combination of the minimum measurement mode of the aforementioned measurement operation level and the power optimized DRX mode of the DRX operation level.

In addition, the RRM measurement or D2D related measurement function for mobility management of the terminal may be configured to be activated or deactivated by changing a user's manual setting, and the terminal notifies the base station of information related to the user's manual setting change. A separate RRC control message can be defined for this purpose. For example, when a user accesses an arbitrary base station and is provided with a service or camps on an arbitrary base station in a dormant state, the terminal measures a serving base station, a camping base station, or a neighbor base station for mobility management. When the user sets to deactivate the RRM measurement operation to be performed, the terminal may request such configuration information from the base station through a control message, and the base station may approve it and deactivate the corresponding RRM measurement operation. As described above, when the RRM measurement operation of the terminal is deactivated, the base station may control to activate the RRM measurement operation when it is determined that mobility management is necessary to move the terminal or when there is a manual request from the user. As described above, the D2D-related measurement may also apply a method of activating or deactivating according to a user's manual setting or request.

3 is a message flow chart illustrating a procedure for determining a measurement operation of a terminal in a method for managing a terminal according to an embodiment of the present invention, in which a base station 330 and a terminal 310 negotiate a measurement operation, a measurement operation level, or a measurement; It shows the procedure of making decisions in consultation with related parameters.

Referring to FIG. 3, the terminal 310 first establishes a connection with the base station 330, performs data exchange and measurement, and reports the measurement result to the base station 330 (S301).

The terminal 310 manually changes the setting of the terminal 310, a timer for managing the remaining time set by the base station 330 expires, or an event trigger occurs according to a threshold value set by the movement state estimation. In this case, it is possible to determine a measurement report stop (or deactivate) request or a measurement parameter change request (S303).

When the user's manual setting change or event trigger occurs, the terminal 310 transmits a control message to the base station 330 to request measurement stop or measurement parameter change (S305).

In operation S305, the terminal 310 may transmit operation level information of the desired terminal 310 to the base station 330. The operation level of the terminal 310 may be configured to define the operation level for the measurement and the measurement report, or may be configured to define the DRX operation level, unlike the measurement operation. When the operation level of the terminal 310 is operation level information on the measurement operation, the operation level information of the terminal 310 includes measurement operation activation / deactivation information, and includes the measurement event entry and release conditions, which are the aforementioned measurement related parameters. Separate thresholds or offset values for each measurement operation, thresholds for timer (s) for measurement management, measurement event triggering thresholds or related offset values, triggering measurement or measurement reporting performance. Parameters including timer values, measurement periods, measurement report periods or measurement target frequencies, measurement cell types, or the like may be directly defined or separately defined and may include defined operation level parameters.

Alternatively, when the operation level information of the terminal 310 is operation level information on the DRX operation of the terminal 310, the operation level information of the terminal 310 includes a period for monitoring a DRX cycle and control information (for example, separately define and define operational level parameters that directly include, or are expressed as a combination of parameters, such as on-duration), a timer for DRX operation (e.g., reactivity timer, inactivity timer), DRX operation activation / deactivation, etc. Parameters may be included.

In addition, the operation level of the terminal 310 may be defined in consideration of the measurement operation and the DRX operation. In this case, the related control message may optionally include the measurement operation or the DRX parameters, and the operation level parameter expressed as a combination of parameters. Define and define parameters can be included.

Referring back to FIG. 3, the base station 330 stops or measures the measurement report based on the measurement report stop or measurement parameter change request (operation level information desired by the terminal 310) received from the terminal 310 in step S305. If the parameter change is determined, or if an event trigger occurs by a timer or threshold value set by itself, measurement stop or measurement parameter change is determined (S307).

Thereafter, the base station 330 transmits a control message indicating the determined measurement / measurement report stop or change of measurement parameter to the terminal 310 (S309). In step S309, the base station 330 may notify the operation level information of the terminal 310 in response to the operation level information of the terminal 310 provided from the terminal 310 in step S305.

The terminal 310 receives a control message indicating stop of measurement / measurement report or change of measurement parameter from the base station 330, and performs a measurement operation or stops measurement / measure report in response to the received control message (S311). ).

On the other hand, while the terminal 310 performs a measurement operation according to the stopped state of the measurement / measurement report or the changed measurement parameter, an event is triggered by the user's manual setting change, the end of a set timer, or the threshold value set by the movement state estimation. If occurs, it is possible to determine the measurement / measurement report restart (or activation) request or the measurement parameter change request (S313).

In step S313, the manual setting of the user is performed at any place where the measurement / measurement report stop timer set by the user of the terminal 310 has expired or the measurement / measure report stop (disabled) is set. It may mean that the setting is performed while moving to instruct the measurement / measurement report restart.

In addition, in step S313, the event trigger by setting the threshold value by the movement state estimation may use the signal transmitted from the serving cell by the terminal 310 or the position information of the terminal 310. Here, when the terminal 310 uses the signal of the serving cell, for example, when the signal of the serving cell is lower than the preset reference value, it means an event defined to request measurement / measurement report restart (activation) or change a measurement parameter. do. Signals transmitted from the serving cell may include a cell specific reference signal (CRS), a channel state information reference signal (CSI-RS), a data modulation-reference signal or a UE-specific reference signal (DM-RS), and a positioning reference signal (PRS). Alternatively, it may be defined as RSSI, RSRP, RSRQ or SIR of a reference signal for estimating a received signal from another cell (base station or transmission node).

Accordingly, the event trigger based on the threshold setting based on the movement state estimation may be performed by the terminal 310 leaving the serving cell or moving more than a predetermined distance from the center of the serving cell by using the signal as described above. Control message to perform measurement, report measurement or change measurement parameter when it recognizes that it is located in the boundary area of the serving cell and satisfies the condition of the event set to restart (activate) or request to change measurement parameter. It may be configured to transmit to the base station 330. In this case, when the preset event condition is satisfied, the base station 330 performs the measurement on the serving cell or the neighbor cells in the terminal 310, in addition to the terminal 310 transmitting the control message to the base station 330. It can also be controlled or set.

When location information is used as an event trigger by threshold setting based on the movement state estimation, the terminal 310 leaves the serving cell that the terminal 310 requests (or sets) to stop the measurement / measurement report using the location information applied by the system. It may be configured to trigger a measurement / measurement report restart (activation) or measurement parameter change request procedure when it is recognized that the user has moved more than a predetermined distance from the center of the serving cell or is located at a boundary area of the serving cell.

In step S313, after determining the measurement / measurement report restart (or activation) request or the measurement parameter change request, the terminal 310 requests the measurement / measurement report restart (activation) or the measurement parameter change according to a user setting or an event trigger. The control message for transmitting to the base station 330 (S315).

In operation S315, the terminal 310 may transmit operation level information of the terminal 310 desired by the terminal 310 or selectively transmit a measurement result.

The base station 330 uses the measurement / measurement report restart (activation) request or the measurement parameter change request (or the operation level information desired by the terminal 310) received from the terminal 310 in step S315, or the base station 330 When an event occurs according to a timer and / or a threshold value set in FIG. 6 or when the base station 330 recognizes a change in the moving state of the terminal 310 according to information estimated by the separate state of the moving state of the terminal 310. If so, it may be determined to restart (activate) the measurement / measurement report or change the measurement parameter (S317).

Thereafter, the base station 330 transmits a control message for instructing measurement / measurement report restart or measurement parameter change to the terminal 310 (S319). In step S319, the base station 330 may notify the operation level information of the terminal 310.

The terminal 310 receives a control message indicating that the measurement / measurement report is stopped or the measurement parameter is changed from the base station 330, and performs the measurement / measurement report operation according to the change information indicated by the received control message (S321). ).

Steps S301 to S321 may not be sequentially performed in the measurement operation determination procedure of the terminal illustrated in FIG. 3. For example, the base station 330 may perform steps S307 and S309 without performing step S303 or step S305 in FIG. 3. In addition, even when step S313 or step S315 is not performed in FIG. 3, the base station 330 may perform step S317 or step S319.

As shown in FIG. 3, in the measurement operation determination procedure of the terminal according to an embodiment of the present invention, the base station 330 and the terminal 310 may perform measurement operation, measurement operation level, or measurement operation at the request of the terminal 310. By determining the parameters by negotiating with each other, unnecessary signaling overhead can be prevented, power consumption of the terminal can be reduced, and overall performance of the mobile communication system can be improved in a heterogeneous network environment.

Meanwhile, the measurement operation procedure as shown in FIG. 3 may apply mutatis mutandis to the DRX operation procedure of the terminal 310. That is, the base station 330 and the terminal 310 may determine whether the terminal 310 performs DRX operation, the DRX operation level, or the DRX operation related parameter at the request of the terminal 310.

4 is a message flow diagram illustrating a procedure for determining a DRX operation of a terminal in a terminal management method according to an embodiment of the present invention, and whether the base station 430 and the terminal 410 negotiate DRX operation, DRX operation level, or DRX. The procedure for determining relevant parameters is shown.

Referring to FIG. 4, first, the terminal 410 establishes a connection with the base station 430 and exchanges data without performing a DRX setting (S401). Alternatively, the terminal 410 may perform a DRX operation after establishing a connection with the base station 430.

The terminal 410 determines a DRX operation switching request according to an event triggered by a user manually changing a setting, a remaining time timer managed by an arbitrary base station 430, or setting a threshold by a mobile state estimation. It may be (S403). In step S403, the DRX operation switch means that the DRX operation is started when the terminal 410 does not perform the DRX operation (non-DRX operation), and the DRX operation when the terminal 410 is currently in the DRX operation. To switch the operation to disable (ie non-DRX).

Thereafter, the terminal 410 transmits a control message to the base station 430 to request a DRX operation switch request (ie, DRX operation start or DRX operation stop) or DRX parameter change according to a user's manual setting or an event trigger ( S405).

In step S405, the terminal 410 may transmit its desired DRX operation level information to the base station 430.

The base station 430 uses the DRX operation switch request (ie, DRX operation start or DRX operation stop) or DRX parameter change request (or terminal 410 operation level information) information received from the terminal 410 in step S405. Alternatively, the DRX operation change (ie, the DRX operation start or the DRX operation stop) or the DRX parameter change is determined according to the event trigger by the timer or the threshold value of the base station 430 (S407).

Thereafter, the base station 430 transmits a message indicating the determined DRX operation change (ie, DRX operation start or DRX operation stop) or DRX parameter change to the terminal 410 (S409). In step S409, the base station 430 may notify the operation level information of the terminal 410.

The terminal 410 receives a message indicating a DRX operation change or a DRX parameter change from the base station 430, and switches the DRX operation according to the change indicated by the received control message (starting the DRX operation or stopping the DRX operation). Or perform a DRX operation according to the changed DRX parameter (S411).

Thereafter, the terminal 410 may determine a DRX operation stop (or restart) request or a DRX parameter change request according to a user's manual setting or a result of an event triggered by a threshold setting by a movement state estimation (S413).

In step S413, the manual setting of the user may mean a DRX operation start or DRX stop timer set by the user of the terminal 410 directly, or the terminal at any place where the DRX operation start or DRX operation stop is set. It may mean that the user directly sets the DRX operation to stop the DRX operation or restart the DRX operation while the 410 moves.

In addition, in step S413, the event trigger by setting the threshold value by the movement state estimation may be configured such that the terminal 410 uses a signal transmitted from the serving cell or uses location information.

When the terminal 410 uses the signal transmitted from the serving cell, the terminal 410 receives the signal transmitted from the serving cell, compares the received signal with a preset reference value, and stops the DRX operation based on the comparison result. Alternatively, this may mean an event defined to transmit a DRX restart request to the base station 430 or to perform a DRX parameter change request. Here, the signal transmitted from the serving cell may be, for example, a reference capable of estimating a received signal from a CRS, CSI-RS, DM-RS (or UE-specific RS), PRS or other cell (base station or transmitting node). It may be defined as RSSI, RSRP, RSRQ or SIR of a signal.

Therefore, the event trigger by setting the threshold value by the movement state estimation Recognizing that the terminal 410 has left the serving cell, moved more than a certain distance from the center of the serving cell using the signal transmitted from the serving cell, or is located in the boundary area of the serving cell, stops (or restarts) the DRX operation. ) When the request or DRX parameter change request satisfies the condition of the event, the terminal 410 transmits a DRX operation stop (or restart) request or a control message for changing the DRX parameter to the base station 430. it means.

In addition, when the location information is used as an event trigger by the threshold setting according to the movement state estimation, the serving cell that the terminal 410 requests (or sets) the measurement / measurement report stop using the location information applied by the system. When it is determined that the user has left, moved more than a certain distance from the center of the serving cell, or is located in the boundary region of the serving cell, it may be controlled to trigger a DRX operation stop (or restart) request or a DRX parameter change request procedure.

Referring to FIG. 4 again, as described above, when the user's direct setting or an event trigger occurs based on a timer or a threshold value in step S413, the terminal 410 sets DRX according to the user's setting or the contents of the generated event trigger. A control message for requesting operation stop (or DRX restart request) or DRX parameter change is transmitted to the base station 430 (S415). Here, the terminal 410 may transmit operation level information of the desired terminal 410 or selectively transmit battery information of the terminal 410.

The base station 430 requests to switch the DRX operation received from the terminal 410 (that is, when the DRX is in operation, the operation is switched to deactivation of the DRX operation (non-DRX) or when the non-DRX operation is switched to the DRX operation restart). Or determine whether to stop (or restart) or change the DRX parameter by using a DRX parameter change request (or terminal 410 desired operation level information) or an event occurrence by a timer or a threshold value of the base station 430. It may be (S417).

Thereafter, the base station 430 transmits a control message to the terminal 410 instructing to stop (or restart) the DRX operation or change the DRX parameter (S419). Here, the base station 430 may notify the operation level information of the terminal 410.

The terminal 410 receives a control message indicating stop (or restart) of DRX operation or change of the DRX parameter from the base station 430, and stops (or performs) DRX operation or DRX parameter according to the information indicated by the received control message. The change is performed to perform a DRX operation (S421).

In the DRX operation determination procedure of the terminal illustrated in FIG. 4, steps S401 to S421 may not be sequentially performed. For example, the base station 430 may perform step S407 or step S409 without performing step S403 or step S405 in FIG. 4. In addition, even when step S413 or step S415 is not performed in FIG. 4, the base station 430 may perform step S417 or step S419.

In addition, in the steps illustrated in FIGS. 3 and 4, the control information may be configured as one control message or may be divided into two or more control messages and transmitted. When the control message is composed of two or more messages, an RRC layer (an RRC control message using a signaling dedicated channel, a MAC control PDU) or a physical layer (physical layer control channel, physical downlink control channel (PDCCH), PUCCH ( Physical Uplink Control Channel) may be configured to control messages by different radio protocol layers.

For example, the RRC layer control message may be used to (re) configure related functions and parameters for DRX operation or measurement / measurement reporting operation, and may include information on MAC layer or physical layer control message (MAC control PDU, physical layer control channel). Field bits or indication bits, feedback information bits, etc.) to enable (deactivate) each DRX operation or measurement operation, and to perform a parameter change request or parameter change instruction.

That is, the MAC layer or the physical layer sends information bits (s) indicating activation (deactivation), parameter change, and specific parameter value or range desired for the DRX operation or each measurement operation configured through the RRC layer control message. When the control message is transmitted to the base station, the base station determines whether to activate (deactivate) or change the parameter based on the control information (or bit) received from the terminal, and then the RRC control message, the MAC layer or the physical layer. The control message may be used to instruct the terminal of activation (deactivation) or parameter change for each operation.

On the other hand, the terminal may have a complex function. For example, a user terminal may be a terminal having a general voice and data service function, a terminal supporting an MTC function, a base station or a terminal that exchanges voice or data through direct communication between terminals without passing through a node of a mobile communication network. There may be a terminal supporting a communication function, a terminal supporting a wireless LAN function such as WiFi, or a terminal supporting all the above functions.

As described above, as a terminal supporting a complex function performs various functions, power consumption of the terminal may increase. For example, a terminal supporting a WLAN function continuously searches for an access point (AP) to access a WLAN, and a terminal supporting direct communication between terminals performs direct communication between terminals. For example, power consumption may be increased by performing discovery or monitoring to confirm the existence of another terminal or the existence of a direct communication service between terminals. In addition, the terminal supporting the Global Positioning System (GPS) function may increase power consumption by performing an operation for searching for a GPS signal. That is, a terminal having a complex function increases power consumption by performing various functions, thereby reducing the usage time of a battery included in the terminal.

As a method for reducing power consumption of the terminal, a method of controlling various functions included in the terminal to selectively operate through a user setting, an implicit method, or an autonomous method may be used.

FIG. 5 is a conceptual diagram illustrating a network environment to which a terminal management method according to an exemplary embodiment of the present invention is applied. In case an AP 510 of a wireless LAN exists in a service area 501 of a predetermined base station 500, FIG. It is a conceptual diagram for explaining an AP discovery scenario.

Referring to FIG. 5, the terminals 511 and 513 may receive necessary services through the AP 510 for the WLAN service in the service area 501 of the base station 500. However, the terminals 511 and 513 do not always need to keep the AP 510 search function activated to receive the WLAN service.

That is, to reduce the power consumption of the terminals 511 and 513 and to enter the service area 501 of the base station 500 where the AP 510 is located in order to search for the necessary AP 510, the terminals 511 and 513 May be configured to discover or monitor the AP 510.

In the mobile communication system, the terminal 511 that establishes a connection with the base station 500 or the terminal 513 that does not establish a connection with the base station 500 is connected to the base station 500 through system information broadcast from the base station 500. Information such as a unique identifier (eg, a cell identifier) or an identifier indicating a service area (eg, a local area ID and a routing area ID) may be obtained.

Accordingly, the user may designate a specific base station and search for an AP for WLAN service only when entering a service area of the designated specific base station.

For example, if it is determined that the terminal is a service area of a school, a company, a home, a user-specified area or a home base station or a CSG cell, the terminal may start an AP discovery or monitoring operation when entering the service area of the base station or the corresponding area. The terminal may be configured to stop the AP discovery or monitoring operation when leaving the service area of the corresponding base station or the corresponding region.

The setting of the terminal as described above may be configured such that the user does not need to recognize or confirm the identifier of the corresponding base station or the corresponding region, but only by selecting a corresponding region through the user interface of the terminal. For example, simply selecting or touching a button, icon, or graphic object that allows AP discovery or monitoring on the monitor screen of the terminal can be configured to set the region or base station to a base station or region that allows AP discovery or monitoring. have. When a specific region or a specific base station is selected through the above method, the terminal stores the identifier for the specific base station or the specific region by using the system information of the mobile communication system, and then the terminal services the specific region or the specific base station. When entering the area, the WLAN AP may be controlled to perform discovery or monitoring operation, and the user may access the WLAN AP through pop-up or separate signaling (for example, sound and vibration) on the monitor of the terminal. Alternatively, a procedure may be introduced to reconfirm whether to allow the monitoring operation to be performed.

On the other hand, as described above, the activated WLAN AP discovery or monitoring function is deactivated so as not to perform the AP discovery or monitoring operation implicitly or automatically when the user leaves the service area of a specific region or a specific base station set up or user. Introduces the reconfirmation procedure to determine whether to perform AP discovery or monitoring according to the user's reconfirmation.

6 is a message flow diagram illustrating an AP discovery procedure of a terminal in a terminal management method according to an embodiment of the present invention.

Referring to FIG. 6, when the terminal 610 is located in a service area of an arbitrary base station 630, the terminal 610 receives system information broadcast from the base station 630 (S601), and receives the received system information. By using the identifier of the base station 630 and / or the terminal 610 may recognize the region identifier for the current location.

When the user wishes to activate the AP 650 discovery or monitoring operation for the WLAN when the user is located in the region where the base station 630 or the base station 630 belongs (S603). Here, the terminal 610 may be configured to provide the user interface as described above so that the user adds the base station 630 or the region information to the AP 650 search allow list through the user interface.

As described above, after a specific base station 630 or a specific region is set as an allowable target of activation of the AP 650 discovery or monitoring operation, the terminal 610 is included in the system information broadcast from the base station 630 when the mobile station moves. In operation 605, the controller determines the region identifier and determines whether the region identifier corresponds to the identifier set to allow activation of the discovery or monitoring operation of the AP 650 (S605).

 If the base station 630 or the area identifier obtained from the system information broadcast from the base station 630 matches the identifier set to enable the AP 650 discovery or monitoring operation, the terminal 610 transmits the information from the AP 650. Receiving beacon information or advertisement information (S607), and searching for an AP 650 capable of serving a wireless LAN service using the received information or searching for an AP 650 capable of serving by performing a monitoring operation. If the wireless LAN service is activated (S609).

Meanwhile, after step S605 of FIG. 6, a procedure for re-confirming whether to allow activation of a WLAN AP discovery or monitoring operation in a specific base station or a specific region may be added.

In addition, in the AP discovery procedure of the terminal illustrated in FIG. 6, when the WLAN AP discovery or monitoring operation is activated, the terminal 610 checks the system information of the mobile communication system to identify the base station 630 or the region identifier in the system information. Determines whether it matches the identifier set to allow activation of the AP discovery or monitoring operation (S605), and if it does not match, may implicitly disable the WLAN AP discovery or monitoring operation.

In the hybrid terminal having various functions, the terminal may apply the procedure as shown in FIGS. 5 and 6 to not only activate the above-described WLAN AP discovery or monitoring operation but also activate various functions. It can be controlled to activate only when entering a specific area.

For example, a terminal having a complex function is a terminal capable of direct communication between terminals, a terminal separately registered for a direct communication service between terminals (for example, a specific terminal such as a family member or an acquaintance), or an MTC supporting terminal. In accordance with a procedure as shown in FIGS. 5 and 6, a terminal of a base station to which a terminal is specified may be applied to a procedure of activating (or deactivating) a search or monitoring operation of a service signal related to direct communication between terminals or activating (or deactivating) an MTC function. Alternatively, it may be controlled to activate (or deactivate) when entering the area.

In addition, the hybrid terminal having a GPS function may be configured to always receive a GPS signal when the terminal is connected to an external power source, and to not receive a GPS signal when the external power source is disconnected. Or, if it is determined that the composite terminal with GPS function is implicitly located indoors such as a home or a company (for example, the terminal with GPS function is located in a service area of a home base station or CSG cell). In this case, the above-described method and procedure may be applied in order to deactivate the reception operation of the GPS signal.

Meanwhile, the measurement and measurement reporting operation activation / deactivation procedure described with reference to FIGS. 3 and 4 and the DRX operation activation / deactivation procedure are based on the activation and deactivation procedures of the WLAN AP discovery or monitoring operation described in FIG. 6. It may be activated when entering the service area of the base station, and may be configured to deactivate when leaving the service area of the preset base station.

For example, the procedures related to the AP discovery operation activation setting performed in steps S603, S605, and S609 of FIG. 6 may be applied to the measurement and measurement report operation activation / deactivation procedure or the DRX operation activation / deactivation procedure. That is, the trigger of the step S303, step S313 of FIG. 3 or step S403 of FIG. 4, step S413 of FIG. 3 is not based on a timer or a threshold value for the measurement and measurement report operation activation / deactivation procedure or DRX operation activation / deactivation. By comparing and confirming the identifier information of the 330 or 430 with a preset base station identifier (or region identifier), the base station may be configured to request an operation change to activate or deactivate the measurement / measurement report operation or the DRX operation. . In this case, the base station identifier (or region identifier) that is preset in order to trigger the measurement / measurement report operation or the activation or deactivation of the DRX operation may be set by the user or a specific base station (or group) such as a home base station, a CSG, a company, a school, or the like. It may be configured to set the area identifier or through a separate message at the time of service subscription or connection establishment in the mobile communication network.

Recently, a terminal such as a smart phone or a pad-type terminal is always connected to a mobile communication network or a wireless LAN to provide a service of 'always-on' concept and provides various services such as messenger and mail transmission and reception. do.

However, when the terminal continuously maintains a connection with the base station to provide the service as described above, control signaling for the measurement operation or the measurement result report in the connected state (eg, RRC_Connected state) is increased. In addition, a problem may occur in a mobility management procedure such as a handover, an increase in power consumption of a terminal, and an occupation of physical layer control channel resources such as feedback information, a sounding symbol, or a reference symbol. This increases the efficiency of the system.

In order to solve the problem caused by the terminal continuously maintaining the connection with the base station, when the terminal providing a service that generates a burst data such as messenger, mail transmission and reception in the idle state (idle state), Alternatively, the state transition from the idle state to the connected state frequently occurs in order to transfer a small amount of data to the terminal, and the control signaling necessary for the connection establishment due to such frequent state transitions increases, resulting in increased system efficiency. Degrades.

In order to overcome the inefficiency of the system as described above, as in the existing Universal Mobile Telecommunications System (UMTS), a method of introducing a dormant state corresponding to an intermediate stage between a connected state and an idle state may be considered. In this case, there is a disadvantage that it is practically difficult to apply because the standard procedure needs to be changed according to the introduction of the doping state.

Therefore, when the terminal transitions from the connected state to the dormant state rather than introducing an additional state such as a dormant state, the base station and the terminal maintain the information of the terminal (for example, RRC context information) for a certain time after disconnection. May be considered.

That is, when all data stored in the transmission buffer of the terminal or the base station is transmitted and new transmission data does not occur for a preset time, the terminal is controlled to transition from the connected state to the idle state. However, at this time, the information of the terminal (for example, RRC context information) is not immediately deleted at the same time of disconnection, but is maintained for a predetermined time or for a time set in the disconnection procedure. In this case, since the terminal is disconnected from the base station, the terminal does not have to perform the measurement operation and the measurement result report in the connected state, and the physical layer control channel such as feedback information, sounding symbol, and reference symbol. Occupation of resources can also be avoided.

In addition, the mobility management procedure of the terminal can be controlled to operate according to the idle state rather than the connected state, thereby reducing the power consumption of the terminal.

On the other hand, even if the terminal is disconnected from the base station, when new data is generated within the time to maintain the information of the terminal and transition from the dormant state to the connected state, the information of the terminal (for example, RRC context information) is maintained It can be applied to reduce the signaling overhead required in the connection establishment procedure.

The terminal information maintained by the terminal for a predetermined time after disconnection from the base station includes information related to the mobility of the terminal, terminal identifier information, information on services provided by the terminal, security information, data information, and retransmission information. It means information necessary for the base station and the terminal to maintain the connection and provide services, such as configuration information of the MAC layer and the RLC layer, physical layer control channel configuration information, management information on the established connection, and the like. Here, the information to be maintained at the information holding time may be selectively set from the above information, and the terminal information to be maintained may be configured to be separately set by the base station and the terminal.

The time for maintaining the terminal information can be set in milliseconds, seconds, minutes, and hours, and can be managed through a timer. When the information retention time (or terminal information deletion time) timer expires, the stored terminal information is deleted and thus cannot be used in the connection establishment procedure.

The information holding time (or timer) of the terminal may be set for each base station or for any terminal. When the terminal information holding time is set for each base station, the base station may transmit a parameter for transmitting the terminal information holding time to the terminals by using the system information broadcast by the base station or indicating the terminal information holding time at the time of connection establishment (or release).

On the other hand, when setting the information holding time of the terminal for each terminal, the base station may transmit the information holding time parameter to the terminal at the time of connection establishment (or release). Whether the information retention time parameter or the information retention time parameter is applied may be determined according to a service type, a traffic type or a UE capability.

As described above, in the information holding time, when the connection between the base station and the terminal is released, it stores information or partial information necessary for establishing the connection, and then, when the connection is reset within the information holding time, the stored information is applied to the signal of the resetting procedure. The ring overhead can be reduced, and the information of the held terminal is deleted when the information holding time ends.

On the other hand, if the base station to which the terminal attempts to connect within the information holding time due to the movement of the terminal is changed, the terminal informs the base station to which the terminal attempts to establish a connection, and informs the terminal of the information of the terminal. Can be configured to receive through.

The base station and the terminal may also consider a method of releasing the connection after the base station and the terminal disconnect timer expires by introducing a disconnect timer (eg, RRC release timer) parameter.

In the case of using the disconnection timer, since the connection state is before the expiration of the disconnection timer, control signaling for the measurement operation and measurement result reporting in the aforementioned connection state (eg, RRC_Connected state) increases, and handover is performed. This may cause an obstacle in the mobility management procedure, increase the power consumption of the terminal, and increase the occupation of physical layer control channel resources such as feedback information, sounding symbol, and reference symbol. exist.

However, the signaling overhead required in the connection establishment procedure due to frequent state transitions can be avoided. The disconnection timer can also be set in milliseconds, seconds, minutes and hours in the same manner as the information retention reference time parameter, and can be set for each base station or for any terminal. . In addition, whether to apply the disconnect timer parameter may be determined according to a service type, a traffic type, or a UE capability.

The terminal may request the setting of the information holding time parameter or the connection timer parameter when the connection is requested, or may request the application of the information holding time or the application of the connection timer. When the base station receives the request as described above from the terminal in executing the disconnection procedure, the base station transmits the information retention time parameter or the disconnection timer parameter to the terminal before disconnection, or whether the information retention time is applied or the disconnection timer is applied. Can be set or instructed.

On the other hand, the user manually sets the screen of the terminal, which maintains the connection for the service, such that the screen lock function or the screen saver function is executed by the user's key or touch operation or a preset timer. If yes, the introduction of the 'log-in' concept, which maintains the connection of the service being provided regardless of screen switching, stops (deactivates) measurement / measurement report as described above, requests for change of measurement parameters, DRX It may be configured to request an operation change or a DRX parameter change.

In addition, the manual setting of the user may be applied even when the 'screen lock function' or the 'screen saver function' is released by the user. That is, if the screen lock function or the screen saver function is released by the user's key or touch operation or a preset timer, and the display screen of the terminal is switched, the terminal restarts (activates) the measurement / measurement report. The base station may be configured to request a parameter change request, a DRX operation change, or a DRX parameter change, and the like.

The manual setting of the user may change the measurement operation or DRX operation of the terminal by setting the relevant parameter directly by the user, or by setting the operation change through a key or touch operation, in addition to the case of the screen switching function of the terminal as described above. That means every way.

The manual setting change of the user, including the screen switching function of the terminal or the direct related parameter setting or the operation change setting by the user, is recognized through the function of the control software provided in the terminal and the corresponding function in the terminal is operated. By implementing, the event for executing an operation change of the terminal may be triggered according to the manual setting change of the user.

The concept of 'log-in' is that the screen of the terminal is blocked by the 'screen lock function', 'screen saver function' or other method while the terminal maintains the connection for the base station and the service, or the terminal for a predetermined time. When the user does not provide any input through the input means, it may mean a state of minimizing or deactivating the measurement operation of the terminal and minimizing power consumption of the terminal by applying the DRX function to the same level as the idle state.

When the terminal is in the 'log-in' state, the terminal may apply a handover procedure different from the mobility procedure in a general connected state (ie, RRC_connected state). For example, instead of performing a handover procedure every time a cell changes due to the movement of a terminal, the handover procedure is performed only when the level of the cell is changed, or only when the cell leaves a preset region. The method of performing can be applied. Here, when the level of the cell is changed, it may mean a movement between a macro cell and a micro cell (or pico cell, CSG cell, home cell) having different power levels or sizes of service areas.

That is, the terminal may be configured to perform the handover procedure only when the terminal in the 'log-in' state moves from the macro cell to the small cell such as the pico cell, the CSG cell, or the home cell. In addition, the terminal may be configured to perform a handover procedure even when the terminal in the 'log-in' state moves between different pico cells, CSG cells, or home cells having similar power levels but different cell attributes. For example, the terminal may be configured to perform a handover procedure when the terminal in the 'log-in' state moves from the CSG cell to the pico cell or the home cell.

Alternatively, when the terminal leaves a preset region, even if the same level of inter-cells leaves a plurality of cell areas included in a predetermined range, such as a tracking area (TA) and a routing area (RA), or a 'log-in' state The UE may be configured to perform the handover procedure only when the UE moves through a predetermined number of cells or more.

Or, if a terminal in a general connection state other than the above-mentioned 'log-in' state is also required, the handover procedure is performed only when the cell level is changed to reduce the system overload or signaling overhead according to the handover procedure. Or, the method of performing the handover procedure may be applied only when leaving the preset area.

7 is a message flowchart illustrating a handover procedure when a terminal is in a logged-in state in the terminal management method according to an embodiment of the present invention.

Referring to FIG. 7, the base station 710 presets whether to allow entry of a 'log-in' state to an arbitrary terminal 750 (S701). The terminal 750 may transmit a control message to the base station requesting whether to enable or disable the 'log-in' status function. The base station 710 receives a control message requesting whether to enable or disable the 'log-in' status function transmitted by the terminal and determines whether to allow it, and then 'log-in' as a result of the determination. A control message may be transmitted to the terminal 750 to set whether to allow or disable the state. In addition, even when there is no request from the terminal 750, the base station 710 may transmit a control message to enable or disable the 'log-in' state to the terminal 750.

The terminal 750 receives a control message allowing a 'log-in' state from the base station 710, determines an event condition for entering the 'log-in' state, and then enters the 'log-in' state. If the event condition is satisfied, it is determined whether to request to enter the 'log-in' state (S703).

When the terminal 750 determines to enter the 'log-in' state, the terminal 750 transmits a control message requesting entry to the 'log-in' state to the base station 710 (S705). Here, the control message for requesting to enter the 'log-in' state is the event according to the operation level of the terminal 710 or the measurement / measurement report stop (deactivation) according to the user's manual setting, the measurement parameter change request as described above. The control message may be transmitted together with a control message requesting a DRX operation change or a DRX parameter change, or a control message requesting entry into a 'log-in' state. Or vice versa, control messages requesting measurement / measurement reporting stop (deactivation), measurement parameter change request, DRX behavior change or DRX parameter change are sent in place of a control message requesting entry into the 'log-in' state. May be

The base station 710 receives a control message for requesting entry into the 'log-in' state from the terminal 750, and determines whether the terminal 750 enters the 'log-in' state (S707).

Thereafter, the base station 710 transmits a control message indicating whether to enter the 'log-in' state according to the result determined in step S707 to the terminal 750 (S709). At this time, the base station 710 transmits a control message only when allowing entry into the 'log-in' state, and does not transmit a control message when not allowing entry into the 'log-in' state. It may be. In addition, in order for the terminal 750 to operate according to the operation of the base station 710, the terminal 750 transmits a control message requesting entry into the 'log-in' state for a preset time. If a control message for allowing entry into the 'log-in' state is not received, the base station 710 implicitly recognizes that the entry into the 'log-in' state is not allowed and does not enter the 'log-in' state, and is preset. It can be configured to send a control message requesting to enter the 'log-in' state only when an hour passes or a separate condition is satisfied.

The terminal 750 receives an explicit control message allowing entry into the 'log-in' state from the base station 710 through step S709, or permits entry into the 'log-in' state through the implicit method described above. Recognizing and performing a measurement and reporting operation, DRX operation, etc. according to the parameter setting for the 'log-in' state (S711).

In an embodiment of the present invention, the base station 710 may control the terminal 750 such that the terminal 750 in the 'log-in' state follows a limited handover method and procedure. That is, even if the cell is changed in the connected state, the terminal 750 in the 'log-in' state does not perform the handover, and provides system information when necessary, such as a camping procedure of the terminal in the idle state in another adjacent cell. It can be configured to acquire and stay. When the terminal in the 'log-in' state is configured to follow the limited handover method and procedure, the terminal does not perform the handover every time the cell is changed, as described above. Only handover may be performed, or the handover may be performed only when leaving a preset area.

Accordingly, the terminal 750 in the 'login' state determines whether there is data to be transmitted in the uplink and whether handover is performed in the 'login' state (S713), and there is data to be transmitted in the uplink. If it is recognized that the level of the cell is changed or if it is out of the preset area, a random access (RA) procedure is performed to the base station 730 of the cell currently located (S721). In this case, the terminal 750 transmits a random access preamble to the base station 730 for a random access procedure, receives a random access response message from the base station 730, and then provides a serving cell (the serving cell that has established a connection). The base station 730 transmits the information of the terminal, the terminal identifier, the connected radio bearer information, etc. to the base station 730 and requests a limited handover or a control message requesting uplink resource allocation for uplink data transmission. ) Can be sent. The information on the serving cell may include a cell type, a cell ID, a physical layer cell identifier (PCI), and RAT information (Radio Access Technology information) of the cell. have. In addition, the terminal identifier may include identifier information for uniquely identifying the terminal at a base station such as a Cell-Radio Network Temporary Identifier (C-RNTI) assigned by the serving cell 710. In addition, the connected radio bearer information may include control parameter information for logical connection and physical connection established between the serving cell and the terminal for the service being provided.

The base station 730 receives a handover request or an uplink resource allocation request from the terminal 750 in the 'log-in' state through step S721, and receives the serving cell information, the terminal identifier, and the connected radio bearer received from the terminal 750. On the basis of the information and the handover request or uplink resource allocation request information, a control message for requesting information confirmation or handover of the corresponding terminal 750 is transmitted to the serving cell base station 710 using the network ( S723).

The serving cell base station 710 receives a control message for requesting information confirmation or handover for the terminal 750 in the 'log-in' state, which is maintaining a connection with the base station 730, and the corresponding base station. The target base station 730 is set to deliver the control information necessary for the handover procedure and / or information on the corresponding terminal 750 stored therein (S725).

The target base station 730 is a response message for the information confirmation request of the terminal 750 from the serving cell 710, a response message for the handover request, or of the corresponding terminal 750 stored in the serving cell base station 710 After receiving the information and storing the received information on the corresponding terminal 750, complete the handover procedure by setting a new control parameter required for handover, if necessary by assigning uplink resources for data transmission Data is received from the terminal 750 (S727).

Meanwhile, when the base station 710 generates downlink data to be transmitted to the terminal 750 in the 'log-in' state, downlink data is generated to the corresponding terminal 750 to the adjacent base station (s) 730. Request to notify (S717).

The base station 730 that has received the downlink data generation notification of the terminal 750 in the 'log-in' state from the adjacent base station 710 through step S717 notifies the downlink data generation using the paging information (S719). ).

When the terminal 750 in the 'log-in' state acquires system information of the cell 730 in which it is staying and checks paging information indicating a downlink data generation notification to the cell during monitoring paging information, the corresponding cell In step 730, a random access procedure is performed (S721).

The base station 730, which has confirmed the response to the paging information through the random access procedure from the terminal 750 in the 'log-in' state through step S721, informs the serving cell base station 710 of the information of the corresponding terminal 750; A message for requesting handover may be transmitted together (S723).

The serving cell base station 710 receives a request for information from the base station 730 for the terminal 750 in the 'log-in' state, forwards downlink data with a response message, or changes the data path between the base station and the network. The control message may be transmitted to the target base station 730 and the network.

The base station 730 receives the downlink data to be transmitted from the serving cell 710 to the terminal 750, and after completing the handover procedure with the corresponding terminal, may transmit the downlink data to the terminal (S727).

In the handover method and procedure for the terminal 750 in the 'log-in' state illustrated in FIG. 7, the control message between the base stations 710 and 730 and the terminal 750 is a layer 3 message (eg, RRC control information). Or in the form of a Layer 2 message (eg, a MAC control PDU or MAC control element). In addition, the control message between the serving cell base station 710 and the target cell base station 730 may use a conventional handover request and handover response message or a method of constructing and transmitting a separate control message.

Hereinafter, an example in which a terminal management method according to an embodiment of the present invention is applied to a heterogeneous network environment including a cloud base station will be described.

The mobility management of the terminal of the above-described 'log-in' state can be more efficiently applied in a heterogeneous network environment including a cloud base station.

8 is a conceptual diagram illustrating a configuration example of a heterogeneous network including a cloud base station to which a terminal management method according to an embodiment of the present invention is applied.

Referring to FIG. 8, the cloud base station 800 may include a virtual cell 810 performing a function of a base station and a remote wireless node performing a radio frequency (RF) function (for example, an RRH or an RU). (Radio Unit) 821, 823. The connection between the cloud base station 800 and the remote wireless nodes 821 and 823 may be connected by a wired or wireless interface and is not limited to a specific connection method.

The cloud base station 800 may be composed of one or more virtual cells 810 and one or more remote wireless nodes 821, 823, and may efficiently convert one or more virtual cells 810 and one or more remote wireless nodes 821, 823. It may include a separate control entity performing a control function to operate as.

The control entity of the cloud base station 800 uses a plurality of virtual cells 810 and remote wireless nodes 821 and 823 to support interference control, CoMP function support, RRM function support, mobility management, and heterogeneous network function support. It can perform the required co-ordinated operation, function distribution functions and control related functions.

In addition, the cloud base station 800 generally includes radio protocol functions of the physical layer (Layer 1), Layer 2 (Layer 2) and Layer 3 (Layer 3) supported by the base station, the virtual cell 810 and the remote wireless nodes ( 821 and 823 can be distributed. Here, the layer 2 function may include Radio Link Control (RLC), Medium Access Control (MAC), and Packet Data Convergence Protocol (PDCP) functions, and the layer 3 function may include a Radio Resource Control (RRC) function. can do. The remote wireless nodes 821 and 823 of the cloud base station 800 are responsible for some of the functions of the radio and the physical layer, and the virtual cell 810 performs functions of the remaining physical layer, the functions of the layer 2 and the layer 3. Or the remote wireless nodes 821 and 823 are responsible for the radio and physical layer functions, part of the MAC function at layer 2, and the virtual cell 810 is configured to perform the functions of the remaining layer 2 and layer 3 functions. It can be configured to take charge.

In addition, the cloud base station 800 may serve as a macro base station having all the functions of the general base station to directly provide a service to the general user terminal 855 in the service area.

In addition, the cloud base station 800 may include narrow base stations 831 and 833 including small cells such as a pico cell, a CSG cell, and a home base station having a small service area in its service area. The remote wireless node 823 and the narrow base station 833 of the cloud base station 800 may provide a service to the user terminal 852 using a CA or CoMP function.

In the heterogeneous network environment including the cloud base station 800 as described above, the mobility management for the terminal of the above-mentioned 'log-in' state may be more efficiently applied.

That is, the terminal transitions to the idle state in order to support a function of transmitting a small amount of data generated intermittently from an IM (Instant Message) traffic or a terminal such as a smartphone, which has a long data generation cycle and generates a small amount of data. If the mobility management procedure is performed while keeping the 'log-in' state, the ultimate 'always-on' service can be supported.

For example, when a cloud base station 800 is installed in a building, the terminal 853 generating IM traffic is provided with a service from the remote wireless node 821, and then the remote wireless node 821 is logged in. When moving out of the service area of the building and moving to the service area of another remote wireless node 823, the mobility management procedure according to the change of the remote wireless node (for example, handover or remote wireless node change) It can be configured not to perform.

In the case of performing the general mobility management procedure, although there is no data to transmit and receive, the terminal and the base station transmit and receive information for transmitting a control message for mobility management and perform DRX operation or enter the 'log-in' state again. The control messages must be exchanged to carry out the procedures.

However, in the exemplary embodiment of the present invention, the terminal in which the terminal is located is a service area only when IM traffic is generated or paging information is transmitted from the network while the terminal in the 'log-in' state moves inside the building configured as the cloud base station. The service can be restarted by using the wireless node 823 and the procedure described with reference to FIG. 7.

On the other hand, in the cloud base station environment when the terminal of the 'log-in' state restarts the service due to the generation of uplink or downlink, to perform the procedure shown in Figure 7 only to the remote wireless node constituting the cloud base station Can be configured. At this time, if the terminal is located in the service area of the narrow base stations 831 and 833 in the cloud base station service area, and the remote wireless node constituting the cloud base station is not found, the service restarts to the cloud base station 800 supporting the macro service. Can be configured to attempt a connection.

As described above, when the cloud base station 800 manages mobility of a terminal having a 'log-in' state, the handover / terminal confirmation procedure of steps S723 and S725 may not be performed in the procedure shown in FIG. 7. In step S717, the downlink data generation notification procedure may not be performed. In addition, without performing a handover procedure in step S727 of FIG. 7, data transmission and reception may be performed only by confirming the connection of the remote wireless node of the terminal.

In a heterogeneous network environment including the cloud base station 800 as shown in FIG. 8, if the limitations described above are not provided, the terminal may access the terminal through the narrow base station existing in the service area of the cloud base station. You can try to restart the service by following the procedure shown.

However, when the terminal in the 'log-in' state leaves the service area of the cloud base station, it may be configured to perform a general handover procedure.

In the heterogeneous network environment including the various types of base stations or transmission nodes described above, in order to efficiently manage the mobility of the terminal and improve the efficiency of the system, when the terminal in the idle state transitions to the connected state, the terminal transmits information to the base station in the mobile state. You can consider how to report.

For example, in a heterogeneous network environment as illustrated in FIGS. 1 and 2, a service area may be divided into a macro layer service area and a micro layer service area. Here, the macro layer service area may mean an area provided by a wide area base station such as an eNB or a normal cell, and the micro layer service area may be a micro cell, a pico cell, a femto cell, a home cell, a CSG cell. The narrow base station may provide an area for providing a service.

In addition, in the case of a remote wireless node (eg, RRH) or a relay, a service may be provided by selectively including a macro layer service area or a micro layer service area through a corresponding base station connected in a network system.

In the heterogeneous network environment as described above, the terminal in the connected state (RRC_connected state) is provided with a service through the cell constituting the macro layer service area when the moving speed is high through the RRM measurement and the CSI measurement report. When the speed is slow, the service quality can be maintained according to the mobile state of the terminal by configuring the service to be provided through a cell constituting the microlayer service area.

On the other hand, the terminal in the idle state (idle state) that the connection is not established can not perform the efficient RRC connection control because the mobile state is not known.

However, if the terminal provides Mobility State Estimation (MSE) information and mobility history information to the corresponding cell in the connection establishment process, the connection control of the terminal can be efficiently performed.

For example, in an embodiment of the present invention, in order to obtain the mobility history information of the terminal, information, cell selection, or cell of a cell or node in which the terminal has camped within a preset time interval in the idle state. It can be configured to report information about reselection. Here, the camping cell information may include identifier information such as a physical cell ID (PCI), a global cell ID (GCI), a transmission point ID, and the like, and the terminal may camp. It may include information about the number of cells performed and the time (eg, time of stay) stayed in the cell camped by the terminal. In addition, the cell selection / reselection information may include the number of cells that the terminal has performed cell selection / reselection for camping, and identifier information of the corresponding cell.

Table 1 shows the types of parameters of the mobility history information that can be used for mobility management of the terminal and the meaning of each parameter.

Among the parameters shown in Table 1, parameters for time that can be set in ms (millisecond), sf (sub-frame), rf (radio frame), s (second), m (minute), h (hour), etc. are applicable. It can be set as a unit time or expressed as a certain time range.

For example, parameters that can be set in units of time are expressed as {0.5m, 1m, 5m, 10m}, or as shown in Table 2, preset time units and time ranges, and parameter values indicating each of the set time ranges. Can be configured to represent different bits.

In addition, the mobility history information of the terminal may be configured so that the terminal selectively configures and reports among the parameters shown in Table 1 and Table 2 according to its mobility state (for example, MSE) estimated by the terminal.

For example, if the terminal determines that the MSE information or the movement state information estimated through various methods is included in a predetermined low speed range, the current cell information (identifier or dwell time) or previous camping cell information (identifier, or Residence time) and the like.

Or, if it is determined that the mobile state is included in a preset high speed range, information (number, identifier) of cells camped within a preset time interval (eg, mobility history information valid time), cell selection / reselection It may be configured to report the number of cells that have performed the selection, identifier information of the corresponding cell (s) or mobility history information valid time.

In the heterogeneous network environment, for the efficient management of the connected terminals, the number of cells, handover counts, ping-pong handover counts, ping-pong handover cell information (identifier or duplicate count), and cell staying by the terminal within an arbitrary time period Considering the time (dwell time or average dwell time per cell), the number of handovers or cell switching between the macro and the microlayers, the terminal is provided with a service in a cell in the macro layer service area (or a cell in the micro layer service area), or It may be configured to provide a service in a plurality of cells by using a Co-ordination Multi-Point transmission / reception (CoMP) function.

At this time, the number of cells, handover count, ping-pong handover count, ping-pong handover cell information (identifier or duplicate count), cell dwell time (dwell time or average dwell time per cell), macro Corresponding parameters such as the number of handovers or cell switching between microlayers may be configured by the base station or reported by the terminal to the base station using its own storage information.

In particular, the number of cells or handovers passed by the terminal within a preset time is greater than the reference value (or threshold value) of the corresponding parameter that is preset, or the cell residence time (retention time per cell or average residence time) is preset parameter. A terminal shorter than a reference value (or threshold value) of may be configured to provide a service in a macro layer cell.

Alternatively, the number of ping-pong handovers performed by the terminal within a preset time is greater than the preset reference value (or threshold value) of the corresponding parameter, or the cell dwell time (retention time per cell or average residence time) is set to the preset reference value of the parameter ( Or, the terminal longer than the threshold value may be configured to provide a service in a micro-layer cell or to provide a service in a plurality of cells using a CoMP function.

9 is a conceptual diagram illustrating mobility management of a terminal in a heterogeneous network environment considering a small cell in a terminal management method according to an embodiment of the present invention.

9, in a heterogeneous network including a plurality of macro cells 910 and a plurality of micro cells 930, when the frequencies of the macro cells 910 and the micro cells 930 are configured differently, RRM By minimizing the measurement, the mobility management efficiency of the terminal can be improved.

That is, when the macro cells 910 using the first frequency and the micro cells 930 using the second frequency configure the same frequency domain by using different frequencies, the terminal in the connected state may transmit and receive data. Or when the terminal is performing the DRX operation in the connected state, by applying the concept of the above-described 'log-in' state, the terminal does not trigger or perform a handover procedure every time the cell is changed, and leaves the preset area. In this case, only the handover procedure may be performed or only the frequency of the serving cell may be measured without measuring other frequency resources for RRM measurement. Here, the preset area may mean a geopolitical area such as a building interior 950 or a school / large shopping mall 950 in which the small cell (s) are installed, and may include a routing area and a tracking area. ) May mean an arbitrary area set in advance for management of a local area or the like.

Also. The macro cell 910 and the micro cell 930 may provide a service by applying the concept of the cloud base station 900.

Accordingly, the terminal according to the embodiment of the present invention can minimize the power consumption of the terminal by measuring only the frequency of the layer to which the cell to which it is connected belongs, and the load of the system by not performing a frequent handover procedure ( overload) can be reduced.

In addition, in the case of a Scell (Secondary Cell) having only a downlink frequency in a base station environment supporting a carrier aggregation (CA) function (for example, New Carrier Type), the downlink of the corresponding SCell for low power consumption operation of the base station It may be operated in a mode of stopping transmission (off mode) and a mode of transmitting data in downlink of the SCell (on mode). That is, when there is no terminal connected to the corresponding cell and receiving a service, an off mode operation in which the base station does not transmit any signal in downlink other than the minimum downlink signal for measuring the SCell operating in the interrupt mode. And a terminal that is receiving a service or requires a service through a corresponding cell, and is divided into an on mode operation of transmitting control information and traffic information necessary for providing a service in downlink.

The minimum downlink signal for SCell measurement in the suspended mode may assume a synchronization channel or a separately defined probing channel, and these signals occupy discrete radio resources in the time domain and the frequency domain to occupy the corresponding cell. It can be discontinuously transmitted according to the Discontinuous Transmission (DTX) operation cycle of.

On the other hand, in order to efficiently manage mobility in a heterogeneous network environment consisting of a regional base station and a narrow base station, the network may control the terminal to maintain a connection to only a base station belonging to a specific layer among the wide area base station layer or the narrow base station layer. A connection may be established to maintain a connection with a plurality of base stations belonging to a layer to receive a service. For example, in FIG. 1, the terminal 153 maintains a connection with both the wide area base station 110 and the narrow base station 120 to receive a service.

As described above, in the case of a terminal that maintains connection with both the regional base station and the narrow base station, mobility management is performed so as not to perform handover due to the movement between the narrow base stations even when the service area of the narrow base station is moved within the wide base station. can do. For example, in FIG. 1, the terminal 153 maintaining a connection with both the regional base station 110 and the narrow base station 120 moves another adjacent base station 120 in the area of the narrow base station 120. do. In this case, the handover procedure may be performed only when the regional base station is changed, and when the narrow base station is changed, it may be performed by using a connection reconfiguration procedure.

Accordingly, the wide area base station is in charge of a control plane such as mobility management and RRC connection control of the corresponding terminal, and the narrow base station is in charge of a user plane such as traffic data transmission of the corresponding terminal. The manner in which the plane is divided between the regional base station and the narrow base station can be applied. As such, when an arbitrary terminal maintains a connection with both a wide area base station and a narrow base station (hereinafter, referred to as 'multiple connections'), the wide area base station may also be responsible for transmitting traffic data in the user plane. In particular, data transmission of voice services such as Voice over Internet Protocol (VoIP) or services of which quality of service (QoS) is required and real-time services can be controlled so that they can also be transmitted from wide area base stations.

The multiple connectivity can be performed by the terminal to establish a connection with an arbitrary base station or while the connection is already maintained. At this time, the capability of the terminal and the characteristics of the connection service (for example, jitter change) The base station may determine the base station according to jitter variance, latency, backhaul property between base stations, and load status of the base station. In addition, the multi-connection system may determine a base station having a priority for supporting the multi-connection between the base station and the narrow base station. The determined priority base station (eg, PCell or Anchor Cell) may dominantly perform a control procedure for establishing multiple connectivity. Accordingly, the priority base station may instruct to perform a plurality of connections through a connection establishment or connection reestablishment message, and may transmit information such as radio resources, a base station identifier having a priority, a scheduling identifier, an encryption key, and the like, necessary to the terminal. . At this time, if necessary, the system may transmit a multiple connection request message for confirming whether the multiple connection is necessary or whether the multiple connection is agreed to the corresponding terminal through a control message. In addition, the terminal may notify capability information indicating the possibility of multiple connectivity or transmit multiple connectivity activation / deactivation information indicating whether multiple connectivity is necessary when registering with the network or establishing a connection. Therefore, even if the terminal is capable of multiple connectivity, if the terminal transmits or sets information indicating the multiple connectivity deactivation, the system may be configured not to attempt the multiple connectivity procedure for the corresponding terminal.

In case of using the multiple connectivity function, the scheduling identifier and the encryption key used for the corresponding terminal by the base stations supporting the multiple connectivity can be equally applied. In order to apply the same encryption key, the encryption key (e.g., eNB key, KeNB, etc.) of the base station having the priority among the global base station and the narrow base station is shared with other base stations participating in a plurality of connections to encrypt the corresponding terminal ( ciphering, integrity check (integrity check) can be configured to perform.

Therefore, if a regional base station has a priority, packet data (for example, PDCP PDU (Protocol Data Unit)) in which the regional base station performs an encryption procedure is transferred to a narrow base station by using an interface between base stations. The RLC / MAC / PHY layer of the base station is used to send the terminal to the terminal or the base station notifies the base station by using a signaling message to the base station. PDCP / RLC / MAC / PHY process can be performed or transmitted using the encryption key. Alternatively, if the priority is a partner base station, the above procedure is performed using the encryption key of the partner base station. Accordingly, the terminal may transmit and receive data using one encryption key even when maintaining a connection with both the wide area base station and the narrow base station.

As described above, even when maintaining multiple connections with the wide area base station and the narrow base station, the terminal may be configured to share the same scheduling identifier in order to improve the complexity of detecting the scheduling identifier in the physical layer control channel (eg, PDCCH, ePDCCH). Can be. For example, all of the scheduling identifiers for the Semi-Persistent Scheduling (SPS) service (for example, SPS C-RNTI) and the scheduling identifiers for the dynamic scheduling service (for example, C-RNTI). The base station (or cell) may be configured to use the same scheduling identifier. To this end, a scheduling identifier (for example, C-RNTI, Semi-Persistent Scheduling C-RNTI, TPC (Transmit Power Control) -PUCCH-RNTI) is transmitted to a corresponding terminal in a control message of a procedure in which a wide area base station and a narrow base station perform a connection simultaneously. , TPC-PUSCH-RNTI) may be allocated. Alternatively, the scheduling identifier assigned by the base station (wide or narrow base station) that has established a connection may be used. Alternatively, the C-RNTI may be additionally allocated to each base station and the SPS C-RNTI may be configured to apply the same scheduling identifier. In this case, the terminal operates by receiving a plurality of C-RNTIs and one SPS C-RNTI. That is, the terminal receives the SPS service from a plurality of base stations or one base station using one SPS C-RNTI, which is the same scheduling identifier, and schedules allocated services that require dynamic allocation of other packet data and control messages. The service is provided using a plurality of C-RNTIs which are identifiers. That is, a separate C-RNTI may be allocated and operated for each base station connected for multiple connectivity. For example, if a terminal is connected to two base stations, one of each C-RNTI is allocated to each base station, and one of the C-RNTIs having two is a scheduling identifier that uniquely identifies the terminal at the global base station, and the other is at the narrow base station. Scheduling identifier that uniquely identifies the terminal.

The regional base station and the narrow base station supporting multiple connections may use radio resource allocation information of a corresponding base station, for example, channel state information (CSI), channel state information reference signal (CSI-RS), DM-RS, UE specific RS, The state of allocation information such as a sounding reference signal (SRS) and a physical uplink control channel (PUCCH) resource should be transmitted to a base station having a priority at least whenever a plurality of connections are established. Each base station selects a corresponding radio resource (CSI, CSI-RS, DM-RS, UE Specific RS, SRS, PUCCH) to support a terminal receiving a service by using a connection of a regional base station or a narrow base station without multiple connections. In order to support multiple connections, radio resource allocation status information should be transmitted to a base station (for example, PCell or Anchor Cell) having priority in order to avoid collisions when allocating related radio resources.

In order to support multiple connections such as inter-site CAs that are provided with services by maintaining a connection with both the regional base station and the narrow base station, the RRC function in charge of connection control is performed by a base station (PCell or Anchor Cell) having priority. Alternatively, one may consider how each base station shares the RRC function.

Therefore, a procedure for setting a base station having priority among base stations in a process of establishing multiple connections is required, wherein radio resources such as CSI, CSI-RS, DM-RS, UE Specific RS, SRS, PUCCH, etc. Control information such as SPS C-RNTI, C-RNTI, and encryption key may be signaled as a control message between base stations, and the corresponding terminal may be notified using a control message in a connection reconfiguration procedure.

In addition, when the multiple connectivity is released and only one base station maintains the connection, a duplicate or multiple allocated resource for the multiple connectivity (for example, when two C-RNTIs are allocated or a PUCCH resource allocated for each base station) In case of, release information of the resource or allocation information for a single connection is informed to the terminal through a control message.

That is, when the terminal receives the release information, the terminal releases the corresponding resource. When receiving the allocation information for the single connection, the terminal ignores the resource allocated in the multiple connection and allocates the radio resource or scheduling allocated through the control message for the single connection. Maintain a single connection using an identifier.

As described above, in the case of providing a service by maintaining a plurality of connections, the HARQ operation may follow the following procedure. In order to support HARQ of downlink transmission data from a base station to a terminal, PUCCH resources are allocated to respective terminals separately for each base station to perform HARQ operation for each base station, or HARQ operation by allocating PUCCH resources for all base stations in one base station. Can be done.

Meanwhile, in order to support uplink transmission data HARQ from a terminal to a base station, one base station may transmit a physical hybrid-ARQ indicator channe (PHICH) and perform a HARQ operation in the corresponding base station.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

110: regional base station 120: narrow base station
130: remote wireless node 151, 153, 155, 157: user terminal
161, 163, 165: MTC terminal 210, 220: metropolitan base station
231, 233: Base for Cooperation Base 241, 243: Remote Wireless Node
251, 252, 253, 254, 255, 256: user terminal
261, 262: MTC terminal 310: terminal
330: base station 410: terminal
430: base station 500: base station 500
501: service area 510: AP
511, 513: terminal 610: terminal
630: base station 650: AP
710, 730: base station 750: terminal
800: cloud base station 810: virtual cell
821, 823: Remote wireless node 831, 833: narrow base station
851, 852, 853, 854, 855: terminal
900: cloud base station 910: macro cell
930: micro cell 950: inside the building

Claims (19)

In the terminal management method performed in the base station,
Determining whether the terminal controls measurement;
Generating measurement information for measurement of the terminal based on the determined measurement control; And
And providing the generated measurement information to the terminal through a control message. The method according to claim 1,
The determining of the measurement control of the terminal,
As a condition for determining whether the terminal controls the measurement, it is determined whether the state of the terminal is connected, idle or limited connection state, whether or not to provide a carrier aggregation service to the terminal, or received from the terminal And determining the information or the request content, the moving state of the terminal, or the type of the terminal. The method according to claim 1,
Generating measurement information for measurement of the terminal,
Generating measurement information for performing at least one measurement operation among channel state information (CSI) measurement, radio resource management (RRM) measurement, measurement for discovery of a device to device (D2D) terminal, and measurement for D2D communication. Terminal management method characterized in that. The method according to claim 1,
Generating measurement information for measurement of the terminal,
Terminal management, characterized in that the CSI (Channel State Information) measurement, RRM (Radio Resource Management) measurement, measurement for the discovery of D2D terminal, measurement for D2D communication is set differently for each frequency or measurement information is set for each cell differently Way. The method according to claim 1,
Generating measurement information for measurement of the terminal,
And at least one measurement information of a measurement target device, a measurement target parameter, a measurement period, a measurement report period, a measurement event entry, and a measurement event release condition. The method according to claim 1,
Generating measurement information for measurement of the terminal,
And generating measurement information by linking a measurement report period of the terminal with a DRX (Discontinuous Reception) operation period of the terminal. The method according to claim 1,
The determining of the measurement control,
If the measurement-related event does not occur during the second preset time when there is no data exchange with the terminal during the preset first time as an operation change condition of the terminal, the variation range of the measurement report value during the third preset time If it is within the preset range, if it is determined that the mobility management of the terminal is not necessary, when the terminal requests a change according to the manual setting of the user and the measurement report value provided from the terminal satisfies a predefined reference value The terminal management method characterized in that it determines whether it corresponds to at least one. The method of claim 7,
Generating the measurement information
Generating measurement information for indicating at least one of a measurement and measurement report operation change, a measurement and measurement report parameter change, a DRX operation change, and a DRX operation parameter change of the terminal when at least one of the operation change conditions of the terminal is met; Terminal management method, characterized in that. The method according to claim 1,
Determining whether or not the measurement control
And receiving operation level information defining an operation of the terminal from the terminal. The method according to claim 9,
Generating the measurement information,
And setting a parameter for at least one of a measurement operation and a DRX operation of the terminal based on the provided operation level information of the terminal. The method according to claim 9,
The operation level information of the terminal
A first measurement mode in which the terminal performs a measurement and measurement report operation according to a set measurement parameter, a second measurement mode in which the terminal performs measurement and report operation to a minimum while satisfying a service quality of a set radio bearer at least; A third measurement mode in which the terminal selectively performs a measurement operation, a first DRX mode in which the terminal does not perform a DRX operation, a second DRX mode in which the terminal performs a DRX operation according to a set DRX parameter, and the terminal in the terminal And instructing at least one of the third DRX modes to perform a DRX operation to minimize power consumption of the terminal. In the terminal management method performed in the terminal,
Determining whether a measurement change request event has occurred; And
And when a measurement change request event occurs, transmitting a message requesting a change of a measurement operation to a base station. The method of claim 12,
Determining whether the measurement change request event occurs,
When the user of the terminal changes the setting, when the set timer expires, or when at least one of the events caused by the movement state estimation occurs, it is determined that the measurement change request event has occurred. How to manage your terminal. The method according to claim 13,
If an event by the movement state estimation occurs,
When the strength of the signal transmitted from the base station is lower than a predetermined threshold value or when the terminal moves out of a specific region based on location information of the terminal, it is determined that an event by the movement state estimation has occurred. How to manage your terminal. The method of claim 12,
The step of transmitting a message requesting a change in the measurement operation to the base station,
And a request message for requesting to stop measurement and measurement report, restart measurement and measurement report, or change measurement parameter. The method of claim 12,
The step of transmitting a message requesting a change in the measurement operation to the base station,
And transmitting operation level information defining the operation of the terminal to the base station. 18. The method of claim 16,
The operation level information
And information defining an operation level for the measurement and measurement report of the terminal or a DRX (discontinuous reception) operation level of the terminal. 18. The method of claim 17,
The operation level information about the measurement and the measurement report of the terminal
Measurement action activation / deactivation information, thresholds for entering and releasing measurement events, thresholds for timers for measurement management, measurement event triggering thresholds, adjustments to adjust measurement event triggering, and performing measurement or measurement reporting. And at least one of a triggering timer value, a measurement period, a measurement report period, a measurement target frequency, and a measurement target cell type information. 18. The method of claim 17,
The information defining the DRX operation level of the terminal,
And at least one of a DRX cycle, a period for monitoring control information, a timer for the DRX operation, and activation / deactivation information of the DRX operation.

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