KR20190052465A - Apparatus and method for paging processing - Google Patents

Abstract

The present disclosure relates to a paging processing apparatus and a method thereof, capable of efficiently transmitting and receiving a paging signal in a mobile communication system. According to an embodiment of the present disclosure, the paging processing apparatus comprises: a control unit for calculating a period in which a user terminal in an idle state searches for a paging signal in consideration of a power save mode (PSM) period for transmitting and receiving data by using a radio resource control (RRC) connection release command message transmission time, an RRC connection release complete message reception time, and signaling for mobility management of the user terminal; and a storage unit for storing information of a cell where each user terminal is positioned, the RRC connection release command message transmission time for each terminal, the RRC connection release complete message reception time for each terminal, and PSM period information.

Description

[0001] APPARATUS AND METHOD FOR PAGING PROCESSING [0002]

The present disclosure relates to a paging processing apparatus and method capable of efficiently transmitting and receiving a paging signal in a mobile communication system.

Recently, due to the rapid development of communication, computer network and semiconductor technology, not only various services using wireless communication networks have been provided, but the demand of users has been increasing day by day, and the global wireless Internet service market has been exploding Trend. Accordingly, a service provided by a mobile communication system using a wireless communication network is being developed not only as a voice service, but also as a multimedia communication service for transmitting various data. Recently, with the increase of smart phones and the demand for data traffic, mobile operators are investing equipment and technology considering the system part and the influence to accommodate the increased data traffic in various ways.

Long Term Evolution (LTE) is a network for realizing requirements of high data rate, low-latency, and packet optimized radio access for an access network , And is designed to accommodate high-speed rich media while ensuring backward compatibility with existing 3GPP / non-3GPP access networks. LTE is an All-IP-based network that excludes existing circuit-switched based communications and enhances quality of service (OoS) management functions to provide real-time services (eg, voice communications, video communications) The quality of service (QoS) is differentiated for real-time services (e.g., web browsing, Store and Forward data transmission), thereby improving the efficiency of network resources. We also extended the bandwidth for wireless communications by introducing smart antenna technology (MIMO: multiple input multiple output).

In an EPC (Evolved Packet Core) network, which is an LTE core network, an eNodeB, an MME, a MME, a Serving Gateway, and an S-GW < -> P-GW (Packet Data Network-Gateway) to perform call processing for voice and data processing. In the EPC network, a control message such as call setup and release is recognized as an IP packet and transmitted to the P-GW or received from the P-GW and transmitted to the user equipment (UE).

The number of Internet of Things (IoT) terminals connected to the LTE mobile communication network has increased, and management of terminal and system load related functions due to increase in demand has become very important. The object Internet terminal requires a low power consumption and requires a small amount of data and has a small moving range.

This object Internet terminal uses DRX (Discontinuous Reception) / eDRX (extended DRX) and PSM (Power Save Mode) parameters to maintain the RRC (Radio Resource Control) CONNECTED state as much as possible even in the idle state, It is necessary to set the sleeping state time as long as possible.

The present disclosure provides a paging processing apparatus and method capable of efficiently transmitting and receiving a paging signal in a mobile communication system.

A paging processing apparatus of a mobile communication system according to an embodiment of the present disclosure includes a Radio Resource Control (RRC) connection release command message transmission time, an RRC Connection Release Complete message reception time, A controller for calculating a period during which a sleeping user terminal searches for a paging signal in consideration of a power saving mode (PSM) period for transmitting and receiving data using signaling for mobility management; And a storage unit for storing cell information on which each user terminal is located, an RRC connection release request message transmission time for each user terminal, an RRC connection release completion message reception time for each user terminal, and a PSM cycle information.

In addition, in the paging processing apparatus according to the embodiment of the present disclosure, the user terminal is an Internet of Things (IoT) terminal.

Also, in the paging processing apparatus according to the embodiment of the present disclosure, the signaling for mobility management includes at least one of an Attach Request of the user terminal or a Tracking Area Update Request (TAU) of the user terminal do.

Also, in the paging processing apparatus according to the embodiment of the present disclosure, the RRC connection release request message transmission time and the RRC connection release completion message reception time are received through the connection request of the user terminal.

Also, in the paging processing apparatus according to the embodiment of the present disclosure, the control unit may control the paging processing apparatus to transmit at least one of the RRC connection release request message transmission time, the RRC connection release completion message reception time, The user terminal recalculates the period for which the paging signal is searched.

In the paging processing apparatus according to the embodiment of the present disclosure, when the power saving mode is operated before the user terminal enters the sleep state, the control unit sets the RRC The period of the power save mode, and the period of time at which the user terminal searches for the paging signal in the sleep state, plus a time at which the user terminal retrieves the paging signal.

In addition, according to the embodiment of the present disclosure, the paging processing method in the mobile communication system includes information on the RRC Connection Release Command message transmission time and the RRC Connection Release Complete message reception time information ; Receiving information on a power save mode (PSM) cycle for transmitting and receiving data using signaling for mobility management of a user terminal; Calculating a period in which a sleeping user terminal searches for a paging signal in consideration of a RRC connection release request message transmission time, an RRC connection release completion message reception time, and a power save mode period; And transmitting to the user terminal a period in which the calculated user terminal searches for the paging signal.

In addition, in the paging processing method according to the embodiment of the present disclosure, the user terminal is an Internet of Things (IoT) terminal.

Also, in the paging processing method according to the embodiment of the present disclosure, the signaling for mobility management includes at least one of an Attach Request of the user terminal or a Tracking Area Update Request (TAU) of the user terminal do.

Also, in the paging processing method according to the embodiment of the present disclosure, the RRC connection release request message transmission time and the RRC connection release complete message reception time are received through the connection request of the user terminal.

Also, in the paging processing method according to the embodiment of the present disclosure, when at least one of the RRC connection release request message transmission time, the RRC connection release completion message reception time, the user terminal location update request message reception time, and the power save mode cycle is changed Recalculating a period during which the user terminal searches for a paging signal; And transmitting to the user terminal a period during which the re-computed user terminal retrieves the paging signal.

In addition, in the paging processing method according to the embodiment of the present disclosure, the step of calculating the period in which the user terminal searches for the paging signal may include transmitting the RRC connection release request message when the power saving mode is operated before the user terminal enters the sleep state The user terminal searches the paging signal for a period from the time added with the period of the power save mode to the time when the RRC connection release completion message reception time, the power save mode period, and the period when the user terminal searches for the paging signal in the sleep state Period.

According to embodiments of the present disclosure, various data are transmitted and received using a required signaling procedure between a user terminal and an LTE (Long Term Evolution) core network, and a paging process is performed based on transmitted and received data The system efficiency can be increased.

1 is a diagram illustrating an exemplary configuration of a mobile communication system according to an embodiment of the present disclosure.
FIG. 2 is a diagram illustrating an exemplary configuration of an EPC network according to an embodiment of the present disclosure.
3 is an exemplary diagram showing a configuration of a phasing apparatus according to an embodiment of the present disclosure.
4 and 5 are exemplary diagrams illustrating a signaling procedure between a user terminal and a core network according to an embodiment of the present disclosure.
6 and 7 are exemplary diagrams illustrating a signaling procedure between a user terminal and a core network according to an embodiment of the present disclosure.
Figure 8 is a flow diagram illustrating a procedure in which a user terminal according to an embodiment of the present disclosure is switched to a dormant state.
9 is a flowchart illustrating a time checking procedure in which a user terminal transitions to a dormant state according to an embodiment of the present disclosure.
10 is an exemplary diagram illustrating a paging buffering function according to an embodiment of the present disclosure;
FIG. 11 is a diagram illustrating paging standby and user terminal status according to an embodiment of the present disclosure; FIG.
12 to 14 are exemplary diagrams for calculating a paging search cycle according to the embodiment of the present disclosure.
FIG. 15 is a flowchart illustrating a procedure for determining a paging permitted area after transition to a sleep state by a user terminal according to an embodiment of the present disclosure.
16 is a flow chart illustrating the procedure of a paging processing method according to an embodiment of the present disclosure.

The embodiments of the present disclosure are illustrated for the purpose of describing the technical idea of the present disclosure. The scope of the claims according to the present disclosure is not limited to the embodiments described below or to the detailed description of these embodiments.

All technical and scientific terms used in the present disclosure have the meaning commonly understood by one of ordinary skill in the art to which this disclosure belongs unless otherwise defined. All terms used in the disclosure are selected for the purpose of more clearly illustrating the disclosure and are not chosen to limit the scope of the rights under the present disclosure.

As used in this disclosure, the terms "comprising", "having", "having", "having", and the like are to be construed as including the possibility of including other embodiments, unless the context requires otherwise Should be understood as open-ended terms.

The expressions of the singular forms described in this disclosure may include plural meanings unless the context clearly dictates otherwise, and the same applies to the singular expressions set forth in the claims.

As used in this disclosure, expressions such as " first ", " second ", and the like are used to distinguish a plurality of components from each other and do not limit the order or importance of the components.

The term " part " as used in this disclosure refers to hardware components such as software or an FPGA (field-programmable gate array), ASIC (application specific integrated circuit). However, " part " is not limited to hardware and software. &Quot; Part " may be configured to reside on an addressable storage medium, and may be configured to play back one or more processors. Thus, by way of example, and not limitation, " part (s) " may include but are not limited to elements such as software components, object oriented software components, class components and task components, Microcode, circuitry, data, databases, data structures, tables, arrays, and variables of program code. The functions provided within the component and the " part " may be combined into a smaller number of components and " parts " or further separated into additional components and " parts ".

As used in this disclosure, the expression " based on " is used to describe one or more factors affecting an action or an action of a decision, judgment, as described in the phrase or sentence in which the expression is contained, It does not exclude any additional factors that affect the decision, act of judgment or action.

In the present disclosure, it is to be understood that when an element is referred to as being "connected" or "connected" to another element, it is to be understood that any element may be directly connected to or connected to another element, Or &lt; / RTI &gt; can be connected to each other.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the accompanying drawings, the same or corresponding components are denoted by the same reference numerals. In the following description of the embodiments, description of the same or corresponding components may be omitted. However, even if the description of the components is omitted, such components are not intended to be included in any embodiment.

In one embodiment, the mobile communication network includes a wireless network such as a Global System for Mobile communication (GSM), a 2G wireless communication network such as CDMA, an LTE network, a wireless Internet such as WiFi, a Wireless Broadband Internet (WiBro), and a World Interoperability for Microwave Access (E.g., 3G mobile communication network such as WCDMA or CDMA2000), 3.5G mobile communication network such as HSDPA (High Speed Downlink Packet Access) or HSUPA (High Speed Uplink Packet Access) Or 4G mobile communication network currently in service, and any other mobile communication network including a macro base station (macro eNodeB), a micro base station (Pico eNodeB, Home eNodeB) and a user terminal (UE: User Equipment) But is not limited thereto. Hereinafter, an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) as a radio access network of LTE will be mainly described.

As shown in FIG. 1, the mobile communication network may include one or more network cells, and may include a Heterogeneous Network (HET) environment in which different kinds of network cells may be mixed in a mobile communication network. The mobile communication network includes miniature base stations (Pico eNodeB, Home-eNodeB, relay, etc.) 11 to 15, 21 to 23, and 23, which manage small-sized network cells (e.g., 'small cells' such as picocells, femtocells, (Macro eNodeBs) 10, 20 and 30 for managing a wide range of cells (for example, 'macro cells' (MSS) 60, an S-GW (Serving Gateway) 80, a P-GW (Packet Data Network) gateway 90 and an HSS (Home Subscriber Server) (100). Each component shown in Fig. 1 is illustrative, and the components of the mobile communication network in which the present disclosure can be implemented are not limited to those shown in the drawings.

For example, the macro base stations 10, 20 and 30 can be used in an LTE network, a WiFi network, a WiBro network, a WiMax network, a WCDMA network, a CDMA network, a UMTS network, But is not limited to, the characteristics of the macro cell base station that manages the base station.

The micro base stations 11 to 15 and 21 to 23 and 31 to 33 can be used in an LTE network, a WiFi network, a WiBro network, a WiMax network, a WCDMA network, a CDMA network, a UMTS network, but is not limited to, the features of a pico base station, an indoor base station or a femto base station, or a relay that manages a cell having a radius of about m to several tens of meters.

The micro base stations 11 to 15 and 21 to 23 and 31 to 33 and the macro base stations 10 and 20 and 30 independently control the SON server 50, the MME 60, the S-GW 80, (90), HSS (100), and the like.

The user terminal 40 may be a mobile Internet network such as a GSM network, a 2G wireless communication network such as a CDMA network, a wireless Internet network such as an LTE network and a WiFi network, a WiBro network, and a WiMax network, A terminal, a feature of an Internet of Things (IOT) terminal that requires low power consumption and requires a small amount of data and has a small range of movement.

The management server (O & M server) 70, which is a network management apparatus of the micro-base station, is responsible for configuration information and management of the micro base stations 11 to 15, 21 to 23 and 31 to 33 and the macro base stations 10, 20 and 30 . The management server 70 can perform all the functions of the SON server 50, the MME 60, and the HSS 100. [ SON server 50 may include any server that performs macro / micro base station installation and optimization and functions to provide basic parameters or data necessary for each base station. The MME 60 may include any entity used to manage the mobility of the user terminal 40 and the like. In addition, the MME 60 performs a function of a base station controller (BSC), and performs resource allocation, call control, handover control, and handover control on base stations (pico eNodeB, Home- eNodeB, macro eNodeB, Voice and packet processing control, and the like. The HSS 100 is a kind of database for service / authentication of the subscriber.

In one embodiment, one management server 70 can perform all the functions of the SON server 50, the MME 60, and the HSS 100, and the SON server 50, the MME 60, The base station 100 may manage one or more macro base stations 10, 20 and 30 and one or more micro base stations 11 to 15, 21 to 23 and 31 to 33.

Although it is assumed that a macro cell, a pico cell, and a femtocell are mixed in the mobile communication network, the network cell may be composed of a macro cell, a pico cell, and a macro cell.

Specifically, the micro-base stations 11 to 15, 21 to 23, and 31 to 33 can broadcast SIB (System Information Block), which is system information, to the femtocell area managed by itself. And a CSG indicator (Closed Subscriber Group indicator) indicating whether or not it is restricted. SIB is a message that a base station (HeNB, macro eNB) broadcasts information about its own cell to all the user terminals 40. The SIB includes a CGI (Cell Global Identity) (a unique cell identifier in the network), a CSG indication A factor indicating the base station), a CSG ID (an ID for a specific subscriber group), and the like.

When the mobile communication network is assumed to be an LTE network, the LTE network is interworked with an inter-RAT network (WiFi network, WiBro network, WiMax network, WCDMA network, CDMA network, UMTS network, GSM network, etc.). (LTE network, WiFi network, WiMax network, WCDMA network, CDMA network, UMTS network, GSM network, etc.) when one of the inter-RAT networks (e.g., WiBro network) is the mobile communication network. (WiFi network, WiMax network, WCDMA network, CDMA network, UMTS network, GSM network, etc.) are shown apart from one another in the drawing, it is assumed that it is overlaid.

If the micro base stations 11 to 15, 21 to 23 and 31 to 33 and / or the macro base stations 10, 20 and 30 are collectively referred to as a 'base station device', the LTE base station device (eNB in FIG. The Evolved UMTS Terrestrial Radio Access Network (E-UTRAN), which is composed of a plurality of base stations 25-1 to 25-n, has an IP-based flat structure and processes data traffic between the user terminal 40 and the core network. The signal control between them is performed by the MME 60. The MME 60 takes charge of signal control between the eNB 25-n and the S-GW 80 and determines where to route the incoming data from the user terminal 40. [ The S-GW 80 performs an anchor function between the eNBs 25-n and the user terminal between the 3GPP network and the E-UTRAN and transmits the anchor function to the IP network 110 via the P- . The MME 60 / S-GW 80 as a core network equipment manages a plurality of eNBs 25-n, and each eNB 25-n is composed of a plurality of cells. (S1-MME and S1-U in FIG. 2) are used between the eNB 25-n and the MME 60 / S-GW 80, An X2 interface (not shown) is used for over and SON functions.

The setup of the network interface is performed by setting the S1 interface connecting with the MME 60 at the center of the system and the X2 interface which is a network line for direct communication with the eNBs 25-n of other cells existing on the present system. The S1 interface exchanges operation and management (OAM) information to support the movement of the user terminal 40 by exchanging signals with the MME 60. [ Also, the X2 interface exchanges signals for fast handover, load indicator information, and information for self-optimization among the eNBs 25-n.

FIG. 2 is a diagram illustrating an exemplary configuration of an EPC network according to an embodiment of the present disclosure.

The E-UTRAN 25 is an LTE radio access network composed of eNBs 25-1, ..., 25-n, ..., and is based on IP and is connected between the UE 40 and a wireless communication core network And transmits data and control information. In addition, when a terminal using the LTE system moves to an existing 2G / 3G mobile communication network using a voice service, a paging request for a circuit switch (Fallback) to receive voice service, an SMS message to the UE 40 ) And a direct connection to a target cell capable of a CS service.

2, " LTE-Uu " represents an air interface between the E-UTRAN 25 and the UE 40, " S1-MME " represents an interface between the MME 60 and the E-UTRAN 25, "S1-U" represents an interface between the S-GW 80 and the E-UTRAN 25, "S11" represents an interface between the S-GW 80 and the MME 60, "S5 / SGI "represents the interface between the P-GW 90 and the S-GW 90, and" SGi "represents the interface between the IP network 110 and the P-GW 90. And " S6a " may represent the interface between the HSS 100 and the MME 60.

The UE 40 and the eNBs 25-1 to 25-n of the E-UTRAN 25 communicate via the RRC (Radio Resource Control) protocol and the eNB 25- A broadcasting message to a cell area to be controlled by the RRC message is defined as an RRC message. The RRC message may include control messages from the Non-Access Stratum (NAS) protocol, which control messages are transparently transferred to the UE 40 or the core network without being read in the E-UTRAN 25 .

The eNB 25-n is an end point for the radio signal of the E-UTRAN 25 and the control signal is interlocked with the MME 60 via the S1-MME interface and the data traffic is transmitted to the S- (80). The S-GW 80 performs a buffering function for the anchor and downlink traffic for mobility in the E-UTRAN 25. [ The P-GW 90 is a connection point of the external IP network 110, performs IP allocation and billing for a mobile subscriber, and traffic control functions for user data.

The IP network 110 provides an IMS (IP Multimedia Subsystem) service for the UE 40 in the EPC network, a Policy & Charging Rule Function (PCRF), an IMS nodes (for example, a Proxy Call Session Control Function , An Interrogating Call Session Control Function (I-CSCF), a Serving Call Session Control Function (S-CSCF), and an Application Function Function (AF)).

UE 40 sends and receives a call control message for multimedia services using IMS nodes and the Gm interface through an EPC bearer (provided by E-UTRAN / S-GW / P-GW).

The E-UTRAN 25 provides a radio communication function to the UE 40 and performs a function of managing radio resources for the radio communication function.

The MME 60 may receive authentication information for authenticating the UE 40 from the HSS 100 and perform authentication of the UE 40. [ The MME 60 also manages the mobility of the UE 40 and the eNB 25-n at the upper level of the eNB 25-n and controls the setting and release of an Evolved Packet System (EPS) session and a bearer The same call control function can be performed. Mobility and session control with the UE 40 is handled by the NAS protocol at the NAS (Non-Access Stratum) layer located in the control plane of the UE 40 and the MME 60, And the MME 60 communicate with each other through the NAS message. The NAS function is largely divided into EMM (EPS Mobility Management) and ESM (EPS Session Management) functions. In addition, the MME 60 may be directly connected to the IP network 110 through the S-GW 80 and the P-GW 90. The call processing control signal of the eNB 25-n is transmitted to the S-GW 80 via the MME 60 and is transmitted to the P-GW 90 in response to the call processing control signal, Lt; / RTI &gt; The EMM is a sublayer located in the NAS layer, and the EMM procedure is performed, so that the UE 40 has seven EMM states and the MME 60 has four EMM states. In order for the UE 40 and the MME 60 to send and receive NAS messages, a signaling connection must be created between the UE 40 and the MME 60 so that the NAS message can be transmitted. This is called an ECM (EPS Connection Management) connection . The ECM connection is a logical connection and consists essentially of an RRC connection established between the UE 40 and the eNB 25-n and an S1 signaling connection established between the eNB 25-n and the MME 60. That is, the ECM connection is turned on / off means that the RRC connection and the S1 signaling connection are both turned on / off. When an ECM connection is established, an RRC connection is seen from the UE 40, and an S1 signaling connection is established from the MME 60. [ The ECM connection has ECM-Connected and ECM-Idle status depending on whether the NAS signaling connection, ECM connection, or not. According to the EMM procedure, the ECM-Connected state and the ECM-Idle state are frequently moved. This change process is referred to as a state transition.

The S-GW 80 acts as a gateway between the 3GPP network and the E-UTRAN 25 and performs the handover between the eNBs 25-n and the UE 40 between the 3GPP network and the 3GPP network (inter-3GPP) And can perform a mobility anchor function for providing the service. The S-GW 80 can transmit to the P-GW 90 a job necessary for call processing according to the control signal of the eNB 25-n.

The P-GW 90 may allocate an IP address to the UE 40 and apply different QoS policies to the UE 40. [ In addition, the P-GW 90 acts as a gateway to a PDN (Packet Data Network), allowing the UE 40 to access a data network such as the Internet or the Internet to receive services.

Although the S-GW 80 and the P-GW 90 are illustrated as being separated and communicating at the S5 / S8 interface as an embodiment, the S-GW 80 and the P- single gateway).

The HSS 100 may manage authentication information for authenticating the UE 40, location information of the UE 40, and the profile of the UE 40. [ The profile of the UE 40 may include QoS rating information (e.g., priority, maximum available bandwidth, etc.) for each service item to which each UE 40 subscribes. In one embodiment, the authentication information for authenticating the UE 40 and the profile of the UE 40 may be transferred from the HSS 100 to the MME 60 when the UE 40 connects to the network.

The PCRF (not shown) manages policies and rules for charging and allows the P-GW 90 and the S-GW 80 to provide appropriate QoS for the UE 40 and use Allows you to perform the billing function for the bearer.

The IMS node (not shown) is made up of nodes such as P-CSCF, I-CSCF, S-CSCF, and AF in detail and the UE 40 provides multimedia services such as VoIP give.

3 is an exemplary diagram showing a configuration of a phasing apparatus according to an embodiment of the present disclosure.

3, the fading processing apparatus 300 may include a control unit 310, a storage unit 320, a transmission / reception unit 330, and a system bus 340. The control unit 310, the storage unit 320, and the transmission / reception unit 330 may be connected to each other via the system bus 340 so that they can communicate with each other. In addition, the fading processing apparatus 300 may be included in the MME 60 or may be configured separately from the MME 60.

The control unit 310 transmits an RRC connection through an Attach Request message transmitted from the eNBs 25-1, ..., 25-n, ... of the E-UTRAN 25 to the MME 60, A power saving mode for transmitting and receiving data using signaling for a Radio Resource Control (RRC) Release Command message transmission time, a RRC Connection Release Complete message reception time, and signaling for mobility management of a user terminal A period during which the user terminal of the idle state searches for the paging signal may be calculated in consideration of the PSM (Power Save Mode) period. According to one embodiment, the signaling for mobility management of the user terminal 40 includes at least one of a connection request of the user terminal 40 or a tracking update request (TAU) of the user terminal 40 can do.

Also, if at least one of the RRC connection release request message transmission time, the RRC connection release completion message reception time, the user terminal location update request message reception time, and the power save mode period is changed, the control unit 310 controls the paging The period of searching for the signal can be recalculated.

When the power saving mode is activated before the user terminal 40 enters the sleep state, the control unit 310 calculates the period of the RRC connection release request message transmission time, From the time when the period of the power save mode is added to the time when the RRC connection release completion message reception time, the power save mode period, and the period when the user terminal searches for the paging signal in the sleep state are added, . That is, when the transmission time of the RRC connection release request message is T1, the reception time of the RRC connection release completion message is T2, the period of the power save mode is T3, and the period preset by the user terminal 40 to retrieve the paging signal is T4, The controller 310 may calculate the period for which the user terminal 40 searches for the paging signal as T1 + T3 to T2 + T3 + T4.

When the power saving mode is operated after the user terminal 40 enters the sleep state when the user terminal 40 calculates the period for searching for the paging signal, the control unit 310 determines the transmission time of the RRC connection release request message From the time when the RRC connection release completion message is received to the time at which the user terminal searches for the paging signal in the sleep state, plus a period during which the user terminal searches for the paging signal. That is, when the RRC connection release request message transmission time is T11, the RRC connection release completion message reception time is T12, and the user terminal 40 is set in advance to retrieve the paging signal, the control unit 310 controls the user terminal 40 ) The cycle for searching for the paging signal can be calculated from T11 to T12 + T13.

The storage unit 320 may store cell information on which each user terminal is located, an RRC connection release request message transmission time for each user terminal, an RRC connection release completion message reception time for each user terminal, and PSM cycle information. According to one embodiment, the storage unit 320 may include a read only memory (ROM), a random access memory (RAM), a compact disc (CD) -ROM, a magnetic tape, a floppy disc, But is not limited to, an optical data storage device or a carrier wave (for example, transmission over the Internet).

The transceiver 330 may transmit and receive signals for performing the paging processing method. According to one embodiment, the transceiver 330 receives a connection request, a location update request (TAU (Tracking Area Update) Request), an RRC Connection Release Complete (RRC Connection Release Complete) message from the user terminal 40, RRC &lt; / RTI &gt; connection release request message to the user terminal 40. The RRC &lt; Desc / Clms Page number 11 &gt; The transmission / reception unit 330 transmits a signal for setting a basic bearer, and transmits / receives packets transmitted / received between the user terminal 40 and the IP network 110 through the basic bearer.

4 and 5 are exemplary diagrams illustrating a signaling procedure between a user terminal and a core network according to an embodiment of the present disclosure.

4, the embodiment of the present disclosure uses the signal transmitted / received between the user terminal 40 / eNB 25-n and the core network to determine whether the user terminal 40 is active in the idle state, The time to transition to the active state can be calculated. When the user terminals 40 make an Attach Request to the core network, the paging processing apparatus 300 transmits information on the RRC connection release request message transmission time (Time 1), the RRC connection release complete message reception time (Time 2) (EDRX (Extended Discontinuous Reception) period), a power save mode period, and TAC (Tracking Area Code) information in which the sleeping user terminal 40 searches for a paging signal. The information stored in the paging processor 300 can be utilized as paging buffering time and time information for transmitting paging to the eNB 25-n. When the periodic TAU (Tracking Area Update) operation is performed in the user terminal 40, the starting point of the eDRX / PSM timer can be reset when the sleep state of the user terminal 40 is reset.

As shown in FIG. 5, the operations of TAU, eDRX, and PSM are correlated. It is necessary to accurately calculate the time for the user terminal 40 to transition from the active state to the dormant state or the paging state in the dormant state in the core network and the calculated time is required for paging buffering and DDN (Downlink Data Notification) Can be used for treatment.

6 and 7 are exemplary diagrams illustrating a signaling procedure between a user terminal and a core network according to an embodiment of the present disclosure.

As shown in FIG. 6, in the case of the user terminal 40 supporting the eDRX / PSM, the user terminal 40 can maintain the dormant state for a preset time. A function of buffering paging from the core network to the user terminal 40 in the core network may be added. In the case of the core network, buffering according to each function in the MME (60) / S-GW (80) / P-GW (90) can increase the system efficiency.

As shown in FIG. 7, the user terminal 40 transmits the initial access request and the TAC information at the time of TAU to the MME 60. Since the mobility of the IoT terminal is small, it is not necessary to set the paging area to be wide. TAC information for each user terminal is stored in the MME 60 and used as target area information during paging.

Embodiments of the present disclosure may include eDRX / DRX / PSM related timer operations and association, paging area management, which are used to reduce battery consumption of the user terminal 40.

Timer values such as T3324, T3412 Extended Value, and T3324 Extended Value are transmitted from the user terminal 40 to Attach Accept / TAU permission in the Attach Request / TAU request, and the transmitted timer values are transmitted to the RRC- After the release, the user terminal 40 can be used as a time value for searching for paging.

Figure 8 is a flow diagram illustrating a procedure in which a user terminal according to an embodiment of the present disclosure is switched to a dormant state.

8, the time when the user terminal 40 is changed to the sleep state is the time point when the RRC-Release message is delivered from the core network to the eNB 25-n / UE 40, ) May be changed to the dormant state at the time of the RRC-Release. It is possible to maintain the sleep state until the TAU / DRX / eDRX / PSM proceeds. The paging search period in the state where the user terminal 40 is kept in the sleep state is calculated by referring to the TAU period, the DRX period, the eDRX period, and the PSM period values. Only the user terminal 40 can be changed from the dormant state to the active state.

The calculation of the paging detection period of the user terminal 40 in the paging processing apparatus 300 may be performed as follows. The time at which the UE 40 changes to the sleep state is determined by the UE Context Release Command message (Time 1) and UE Context Release Complete (Time 2) transmitted from the MME 60 to the eNB 25- In which the user terminal 40 is changed to the sleep state and the user terminal 40 can remain in the sleep state until the next paging search time.

9 is a flowchart illustrating a time checking procedure in which a user terminal transitions to a dormant state according to an embodiment of the present disclosure.

As shown in FIG. 9, by using a time difference of a section receiving T3324 (Extended Value), T3412 Extended Value, UE Context Release Command (Time 1), and UE Context Release Complete (Time 2) The paging search time of the terminal 40 can be calculated. The paging processor 300 stores the UE Context Release Command (Time 1) and the UE Context Release Complete (Time 2), and the user terminal 40 is changed to the sleep state in the middle of the time 1 and the time 2, When the terminal 40 is changed to the sleep state, eDRX is started.

The paging search time based on the eDRX / PSM setting value may be from UE Context Release Command (Time 1) setting time to UE Context Release Complete (Time 2) + eDRX period. When the PSM is added, the PSM cycle can be added to calculate the paging search time. The paging-related buffering operation can be performed in the MME 60 / S-GW 80 / P-GW 90 until the paging search time.

10 is an exemplary diagram illustrating a paging buffering function according to an embodiment of the present disclosure;

As shown in FIG. 10, even if the paging is applied to the time when the eDRX / PSM mode operates in the time zones 1 and 3, the MME 60 performs buffering until the paging search time, May be buffered or ignored. 2, and 4, when the DDN is input to the time when the eDRX / PSM mode operates, the MME 60 delivers the paging search time calculated by the MME 60 to the gateway 80/90, The incoming DDN can perform buffering. That is, the paging processing apparatus 300 can calculate the next period paging search time by operating the eDRX timer from the time when the user terminal 40 performs RRC Release. The paging search time can be calculated using the eDRX period, the TAU period, and the PSM period.

FIG. 11 is a diagram illustrating paging standby and user terminal status according to an embodiment of the present disclosure; FIG.

As shown in FIG. 11, when at least one of the TAU / eDRX / PSM proceeds, the eDRX timer can be calculated again and initialized. The initialized eDRX timer can be transmitted to the MME 60 and the gateway 80/90 based on the individual signal information.

12 to 14 are exemplary diagrams for calculating a paging search cycle according to the embodiment of the present disclosure.

As shown in FIG. 12, when at least one of the TAU / eDRX / PSM proceeds, the eDRX timer (4) can be recalculated. It is possible to calculate by dividing the number of cases in the state that PSM or eDRX is not known first.

As shown in FIG. 13, when the PSM operates later than the eDRX, the paging search time can be calculated from the UE Context Release Command (Time 1) to the UE Context Release Complete (Time 2) + eDRX period.

As shown in FIG. 14, when the PSM operates before the eDRX, the paging can be buffered or ignored during the time when the PSM operates. Thereafter, the eDRX operates after the PSM operation, and the paging search can be performed at the eDRX operation time. The paging search time can be shared by the MME 60 and the gateway 80/90. The PSM operation time can be calculated from the UE Context Release Command (Time 1) to the UE Context Release Complete (Time 2) + PSM period, and the paging search time can be calculated from the UE Context Release Command (Time 1) Release Complete (Time 2) + PSM cycle + eDRX cycle.

Since the mobility of the IoT terminal is small or limited, it is not necessary to set a wide area according to the paging application. Therefore, the TAC information received by the MME 60 when the access request / TAU is granted can be stored for each user terminal 40, and the number of stored TAC information can be changed by the administrator. The TAC information is continuously updated as much as the number set by the administrator. If the number exceeds the set number, the old TAC information can be deleted and stored as the latest information. The TAC information stored for each user terminal 40 may be transmitted to the eNB 25-n when paging is applied.

FIG. 15 is a flowchart illustrating a procedure for determining a paging permitted area after transition to a sleep state by a user terminal according to an embodiment of the present disclosure.

As shown in FIG. 15, the paging device 300 stores TAC information for each user terminal and can apply the paging area using the stored TAC information.

16 is a flow chart illustrating the procedure of a paging processing method according to an embodiment of the present disclosure. Although process steps, method steps, algorithms, and the like have been described in this flowchart in a sequential order, such processes, methods, and algorithms may be configured to operate in any suitable order. In other words, the steps of the processes, methods and algorithms described in the various embodiments of the present disclosure need not be performed in the order described in this disclosure. Also, although some of the steps are described as being performed asynchronously, some of these steps may be performed concurrently in other embodiments. Also, an illustration of a process by way of illustration in the drawings is not intended to imply that the illustrated process excludes other variations and modifications thereto, and that any of the illustrated processes or steps thereof may be used in various embodiments of the present disclosure Does not imply that it is necessary for more than one, and does not mean that the illustrated process is preferred.

As shown in FIG. 16, in step S1610, information on a RRC connection release command message transmission time and an RRC Connection Release Complete message reception time is received . 1 to 15, the transmitting / receiving unit 330 of the paging processing device 300 receives the eNBs 25-1, ..., 25-n, ... of the E-UTRAN 25, The RRC connection release request message transmission time and the RRC connection release completion message reception time through the Attach Request message transmitted to the MME 60 as the core network. The received information may be transmitted to the control unit 310 via the system bus 340.

In step S1620, information on a power save mode (PSM) cycle for transmitting and receiving data using signaling for mobility management of the user terminal may be received. For example, referring to FIGS. 1 to 15, the transmitting and receiving unit 330 transmits and receives data using signaling for mobility management of the user terminal 40 through an Attach Request message And can receive information about a power save mode (PSM) cycle. The received information may be transmitted to the control unit 310 via the system bus 340.

In step S1630, a period in which the idle user terminal searches for the paging signal may be calculated in consideration of the transmission time of the RRC connection release request message, the reception time of the RRC connection cancellation message, and the power save mode period have. For example, referring to FIG. 1 to FIG. 15, the controller 310 determines whether a user terminal (idle) is idle in consideration of the transmission time of the RRC connection release request message, the reception time of the RRC connection release complete message, 40) can search the paging signal.

In step S1640, a period in which the calculated sleep state idle user terminal retrieves the paging signal may be transmitted to the user terminal. For example, referring to FIG. 1 to FIG. 15, the controller 310 determines whether a sleep state (idle state) calculated in consideration of the RRC connection release request message transmission time, the RRC connection release complete message reception time, May control the transceiver 330 to transmit a period of time during which the user terminal of the base station 30 searches for the paging signal to the user terminal 40. [

Although the method has been described through particular embodiments, the method may also be implemented as computer readable code on a computer readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the computer-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like. In addition, the computer-readable recording medium may be distributed over network-connected computer systems so that computer readable codes can be stored and executed in a distributed manner. And, functional programs, codes, and code segments for implementing the above embodiments can be easily inferred by programmers in the technical field to which this disclosure belongs.

Although the present disclosure has been described in connection with some embodiments herein, it should be understood that various modifications and changes may be made thereto without departing from the spirit and scope of the present disclosure as will be apparent to those skilled in the art to which this disclosure belongs. something to do. It is also contemplated that such variations and modifications are within the scope of the claims appended hereto.

11 ~ 15, 21 ~ 23, 31 ~ 33: micro base stations 10, 20, 30: macro base station
40: User terminal 50: SON server
60: MME 70: management server
80: S-GW 90: P-GW
100: HSS 110: IP network
300: Paging device 310:
320: Storage unit 330: Transmitting /
340: System bus

Claims (12)

A paging processing apparatus of a mobile communication system,
A power for transmitting and receiving data using signaling for RRC connection release command message transmission time, RRC Connection Release Complete message reception time and signaling for mobility management of a user terminal A control unit for calculating a period in which a sleeping user terminal searches for a paging signal in consideration of a power saving mode (PSM) cycle; And
And a storage unit for storing cell information on which each user terminal is located, transmission time of the RRC connection release request message for each user terminal, reception time of the RRC connection release completion message for each user terminal, and the PSM cycle information,
A paging device. The method according to claim 1,
The user terminal comprises:
Internet &lt; / RTI &gt; of Things (IoT)
A paging device. The method according to claim 1,
The signaling for mobility management includes:
(ATU) request of the user terminal or an ATU (Tracking Area Update) request of the user terminal.
A paging device. The method of claim 3,
The RRC connection release request message transmission time and the RRC connection release completion message reception time may be,
Receiving, via a connection request of the user terminal,
A paging device. The method of claim 3,
Wherein,
When the at least one of the RRC connection release request message transmission time, the RRC connection release completion message reception time, the location updating request message reception time of the user terminal, and the power save mode cycle is changed, the user terminal searches for a paging signal Recalculating the cycle,
A paging device. 6. The method of claim 5,
Wherein,
When the power save mode is activated before the user terminal enters a sleep state, the RRC connection release request message transmission time and the power save mode transmission time are added to the RRC connection release completion message reception time, And a period of time during which the user terminal searches for the paging signal in a sleep state,
A paging device. A paging processing method in a mobile communication system,
Receiving information on a RRC Connection Release Complete message transmission time and a RRC Connection Release Complete message reception time;
Receiving information on a power save mode (PSM) cycle for transmitting and receiving data using signaling for mobility management of a user terminal;
Calculating a period during which the idle user terminal searches for a paging signal in consideration of the RRC connection release request message transmission time, the RRC connection release completion message reception time, and the power save mode period;
And transmitting to the user terminal a period in which the calculated user terminal searches for a paging signal.
Paging processing method. 8. The method of claim 7,
The user terminal comprises:
Internet &lt; / RTI &gt; of Things (IoT)
Paging processing method. 8. The method of claim 7,
The signaling for mobility management includes:
(ATU) request of the user terminal or an ATU (Tracking Area Update) request of the user terminal.
Paging processing method. 10. The method of claim 9,
The RRC connection release request message transmission time and the RRC connection release completion message reception time may be,
Receiving, via a connection request of the user terminal,
Paging processing method. 10. The method of claim 9,
When the at least one of the RRC connection release request message transmission time, the RRC connection release completion message reception time, the location updating request message reception time of the user terminal, and the power save mode cycle is changed, the user terminal searches for a paging signal Recalculating the period; And
Further comprising transmitting to the user terminal a period in which the re-computed user terminal searches for a paging signal.
Paging processing method. 12. The method of claim 11,
Wherein the step of calculating the period in which the user terminal searches for the paging signal comprises:
When the power save mode is activated before the user terminal enters a sleep state, the RRC connection release request message transmission time and the power save mode transmission time are added to the RRC connection release completion message reception time, Calculating a period of time during which the user terminal searches for the paging signal from a period of the paging signal to a time of adding the period in which the user terminal searches for a paging signal in a sleep state,
Paging processing method.

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