KR20140073870A - Apparatus and method for paging in wireless communication system - Google Patents

Abstract

The present invention relates to a paging method in a wireless communication system and an apparatus supporting the same, and, more specifically, to a paging method and an apparatus supporting the same which retransmit a downlink data notification message if a serving gateway server receives a tracking area updating request message including location information of a terminal, and an apparatus supporting the same. The paging method of a terminal in a wireless communication system according to one embodiment of the present invention comprises: a step of in which a serving gate way (SGW) transmits a downlink data notification message to a first mobile management entity (MME) allocated to a first area for a terminal in an idle mode located in a second area; a step in which a second MME allocated to the second area receives a tracking area updating request message including location information of said terminal; a step in which the second MME transmits a bearer modifying request message including the location information to the SGW; and a step in which the SGW having received the bearer modifying request message retransmits the downlink data notification message to the second MME.

Description

TECHNICAL FIELD [0001] The present invention relates to a paging method in a wireless communication system,

The present invention relates to a paging method and a device supporting the paging method in a wireless communication system, and more particularly, to a paging method for retransmitting a downlink data notification message when a serving gateway server receives a tracking area update request message including location information of a terminal And a device for supporting the same.

Recently, mobile communication terminals are consuming more power as performance improves. Accordingly, various control techniques have been proposed in which the terminal can utilize the power efficiently.

As a control technique for efficiently using power, a paging technique can be mentioned. The terminal may reduce the power consumption by using idle mode state while the terminal is not in a call state or transmitting / receiving data. The terminal in the idle mode can be switched to the active mode according to a predetermined paging cycle or can be switched to the active mode upon receiving the paging message.

Disclosure of Invention Technical Problem [8] The present invention has been made in order to solve the above problems of the related art, and it is an object of the present invention to provide a method and system for retransmitting a downlink data notification message And a device for supporting the same.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. Lt; / RTI >

According to an aspect of the present invention, there is provided a wireless communication method for a mobile station in which a serving gateway server (SGW) downlinks to a first mobility management server (MME) Transmitting a link data notification message; Receiving, by the second mobility management server, a tracking area update request message including location information of the mobile station; The second mobility management server transmitting a bearer modification request message including the location information to the serving gateway server; And the serving gateway server having received the bearer modification request message retransmits the downlink data notification message to the second mobility management server.

The method may further include performing location registration through the first mobility management server in the first area before the terminal moves to the second area.

The method may further include transmitting, by the terminal, a location registration period message indicating a location of the terminal to a base station allocated to the terminal at each location transmission period.

The method further comprises transmitting, by the second mobility management server, the bearer modification request message if it is determined that the location of the terminal is changed from the first area to the second area based on the location registration period message .

The bearer modification request message may include a transport address of the second mobility management server.

The bearer modification request message may include a tunnel identifier (TEID) set to transmit packet data between the networks.

The method includes determining that the paging through the first mobility management server has failed if the serving gateway server does not receive a response message for the downlink data notification message transmitted to the first mobility management server for a reference time As shown in FIG.

In a paging method of a serving gateway server (SGW) for a mobile station in a idle mode in a wireless communication system according to another embodiment of the present invention, for a mobile station in a idle mode located in a second region, Transmitting a downlink data notification message to the first mobility management server (MME); Receiving a bearer modification request message including the location information from a second mobility management server that has received a tracking area update request message including location information of the terminal; And retransmitting the downlink data announcement message to the second mobility management server.

The method may further include determining that the paging through the first mobility management server has failed if the response message to the downlink data notification message transmitted to the first mobility management server is not received during the reference time have.

The method may further include, upon receiving the bearer modification request message, comparing the received bearer modification request message with a previously received bearer modification request message to determine a location change of the terminal.

The bearer modification request message may include a transport address of the second mobility management server.

The method may further include determining a location change of the terminal based on a transport address of the second mobility management server.

The bearer modification request message may include a tunnel identifier (TEID) set to transmit packet data between the networks.

The method may further include determining a location change of the terminal using a call identifier used for transmission of the packet data included in the tunnel ending identifier.

In a wireless communication system according to another embodiment of the present invention, a serving gateway server (SGW) connected to a mobility management server (MME) for a terminal in a idle mode mode includes a transmission module; Receiving module; And a processor for controlling the serving gateway server including the transmitting module and the receiving module. Here, the processor may transmit a downlink data notification message to a first mobility management server (MME) allocated to a first area for a terminal in a dormant mode located in a second area, Receiving the bearer modification request message including the location information from the second mobility management server that has received the tracking area update request message and retransmitting the downlink data notification message to the second mobility management server.

The processor may be configured to determine that the paging through the first mobility management server fails if the response message to the downlink data notification message transmitted to the first mobility management server is not received during the reference time.

Upon receiving the bearer modification request message, the processor may compare the received bearer modification request message with the previously received bearer modification request message to determine the location change of the terminal.

The bearer modification request message may include a transport address of the second mobility management server.

The processor may be configured to determine a location change of the terminal based on a transport address of the second mobility management server.

The bearer modification request message may include a tunnel identifier (TEID) set to transmit packet data between the networks.

The processor may be configured to determine a location change of the terminal using a call identifier used for transmission of the packet data included in the tunnel ending identifier.

A computer-readable recording medium recording a paging method according to another embodiment of the present invention includes a first mobility management server (MME) allocated to a first area and a second mobility management server A command for transmitting a link data notification message; Receiving a bearer modification request message including the location information from a second mobility management server that has received a tracking area update request message including location information of the terminal; And a command for retransmitting the downlink data notification message to the second mobility management server.

The foregoing general description and the following detailed description of the invention are illustrative and are for further explanation of the claimed invention.

According to each embodiment of the present invention as described above, when the serving gateway server receives the tracking area update request message including the location information of the terminal, it provides a paging method for retransmitting the downlink data notification message and a device supporting the paging method can do.

In addition, according to each embodiment of the present invention, the terminal can receive the downlink data generated before performing the location registration in the second area after the location registration in the second area without delay time.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. It is to be understood, however, that the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.
1 shows an example of a paging method for transmitting a paging message.
2 shows an example of transmitting a paging message to a mobile station moving from a first area to a second area.
3 is a diagram showing an example of a paging method according to the present invention.
4 is a block diagram illustrating a serving gateway server according to an embodiment of the present invention.

The following embodiments are a combination of elements and features of the present invention in a predetermined form. Each component or characteristic may be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, some of the elements and / or features may be combined to form an embodiment of the present invention. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments.

In the description of the drawings, there is no description of procedures or steps that may obscure the gist of the present invention, nor is any description of steps or steps that can be understood by those skilled in the art.

The embodiments of the present invention have been described herein with reference to a data transmission / reception relationship in a wireless communication system including a base station. Herein, the base station is a terminal node of a network that directly communicates with the terminal. The particular operation described herein as performed by the base station may be performed by an upper node of the base station, as the case may be.

That is, various operations performed for communication with a mobile station in a network consisting of a plurality of network nodes including a base station may be performed by a base station or other network nodes other than the base station. At this time, the 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an Advanced Base Station (ABS) or an access point.

In addition, in the present invention, a terminal refers to a terminal to be subjected to a paging method in a wireless communication system according to the present invention, and may be referred to simply as a device. Also, the terminal may be a mobile station (MS), a user equipment (UE), a subscriber station (SS), a mobile subscriber station (MSS), a mobile terminal, Terminal or a device.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of IEEE 802 systems, 3GPP systems, 3GPP LTE and LTE-Advanced (LTE-Advanced) systems, and 3GPP2 systems, which are wireless communication systems. That is, the self-explanatory steps or parts of the embodiments of the present invention which are not described in order to clearly illustrate the technical idea of the present invention can be supported by the documents. In addition, all terms disclosed in this document may be described by the standard document.

The following description is to be understood as illustrative and non-limiting, such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access And can be used in various wireless communication systems. CDMA may be implemented in radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. The TDMA may be implemented in a wireless technology such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented in wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is a part of E-UMTS (Evolved UMTS) using E-UTRA, adopting OFDMA in downlink and SC-FDMA in uplink. LTE-A (Advanced) is the evolution of 3GPP LTE.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same parts are denoted by the same reference numerals throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the terms " part, "" module," and " module ", etc. in the specification mean a unit for processing at least one function or operation and may be implemented by hardware or software or a combination of hardware and software have.

In addition, the specific terms used in the embodiments of the present invention are provided to facilitate understanding of the present invention, and the use of such specific terms can be changed to other forms without departing from the technical idea of the present invention .

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 shows an example of a paging method for transmitting a paging message.

Referring to FIG. 1, when downlink data is generated for a mobile station in step S101, a Serving Gateway Server (SGW) transmits a downlink data notification message to a mobility management entity (MME) (S103).

The SGW is a gateway server for managing the mobility of a terminal between a plurality of MMEs or a plurality of base stations, and can perform a session control function for processing generation of downlink data. In addition, the SGW supports handover between heterogeneous systems (for example, a 3GPP system and a 3GPP LTE system) in cooperation with a base station, and transmits a PDU (Packet Data Unit) using tunneling . In an embodiment of the present invention, the SGW can transmit a downlink data notification message to the MME when downlink data is issued to the terminal.

Next, the MME transmits a paging request message to the base station (S105).

The MME is a mobile communication switching center that controls signals between the SGW and the base station, and manages the mobility of the terminals. Specifically, the MME determines the routing of data to be transmitted to the mobile station, and can perform not only the mobility of the mobile station but also a subscriber authentication function, a paging function, and the like. In the embodiment of the present invention, when the MME receives the downlink data announcement message from the SGW, it transmits a paging request message to the base station.

The paging request message is a message for requesting paging to change the idle mode terminal into the active mode state because downlink data is generated in the terminal.

Next, the base station transmits a paging message to the mobile station (S107).

A paging message is a message for paging a terminal, and a base station can transmit a paging message through a paging channel.

The terminal receiving the paging message can change paging state to receive the downlink data.

2 shows an example of transmitting a paging message to a mobile station moving from a first area to a second area.

Referring to FIG. 2, the terminal moves from the first area to the second area (S201). Here, the first area indicates the area allocated to the first MME, and the second area indicates the area allocated to the second MME. Also, although the terminal moves from the first area to the second area, the location registration for the movement to the second area is not performed.

Next, when the downlink data is generated (S203), the SGW transmits a downlink data notification message to the first MME (S205). Since the location registration is not performed with respect to the UE that has moved to the second zone, the SGW transmits a downlink data notification message to the first MME.

Next, the first MME having received the downlink data announcement message transmits a paging request message to the first base station of the first area (S207).

Next, the first base station of the first area transmits a paging message through the paging channel (S209). However, since the mobile station has moved from the first area to the second area, it can not receive the paging message transmitted by the first base station. Therefore, the paging for the terminal fails and the paging fails even though the first base station transmits the paging message again.

That is, when the UE moves from the first region allocated to the first MME to the second region allocated to the second MME and the downlink data is generated before performing the location registration for the second region, the UE performs paging I can not. In this case, if the UE performs location registration for the second area and generates downlink data again, the UE can perform paging to receive downlink data. However, there is a problem that a delay occurs in reception of downlink data during such a procedure.

3 is a diagram showing an example of a paging method according to the present invention.

Referring to FIG. 3, the terminal moves from the first area to the second area (S301). Here, the first area indicates the area allocated to the first MME, and the second area indicates the area allocated to the second MME. Also, although the terminal moves from the first area to the second area, the location registration for the movement to the second area is not performed.

Next, when the downlink data is generated (S303), the SGW transmits a downlink data notification message to the first MME (S305). Since the location registration is not performed with respect to the UE that has moved to the second zone, the SGW transmits a downlink data notification message to the first MME.

Next, the first MME having received the downlink data announcement message transmits a paging request message to the first base station in the first area (S307).

Next, the first base station of the first area transmits a paging message through the paging channel (S309). However, since the mobile station has moved from the first area to the second area, it can not receive the paging message transmitted by the first base station. Therefore, the paging for the terminal fails and the paging fails even though the first base station transmits the paging message again.

At this time, if the SGW that transmitted the DL data notification message does not receive the paging response message for a predetermined time, it can determine that the paging has failed (S311).

Next, the UE located in the second area transmits a tracking area update request message to the second base station in the second area (S313).

The tracking area update request message is a message informing that the tracking area in which the terminal is located has changed.

The Tracking Area (TA) is information used by the cellular network to manage the UE in the idle mode. The TA may comprise a plurality of cells. When a paging message is transmitted to a terminal, all base stations included in the corresponding TA transmit a paging message. If the terminal is present in the corresponding TA, the terminal can receive the paging message.

Next, the second base station receiving the tracking area update request message transmits a tracking area update request message to the second MME (S315).

Next, the second MME having received the tracking area update request message transmits a bearer modification request message including location information to the SGW (S317). As a remedy, the bearer modification request message may include the transport address of the second MME and a Tunnel Endpoint Identifier (TEID). The TEID is information set for transmitting packet data between network nodes. Generally, the TEID is set to include a number of a user traffic module to be used for transmission of packet data and a call_ID (Call_ID) in the corresponding traffic module.

That is, the SGW can know that the UE has moved from the first region to the second region allocated to the second MME through the bearer modification request message.

Next, the SGW transmits a downlink data notification message to the second MME immediately after receiving the bearer modification request message (S319). Since the SGW has determined that the paging of the UE has failed after the generation of the downlink data, the SGW immediately transmits the downlink data notification message to the second MME after receiving the bearer modification request message so that the downlink data can be transmitted .

Next, the second MME transmits a paging request message to the second base station (S321), and the second base station transmits a paging message to the mobile station (S323).

Since the terminal is located in the second area allocated to the second base station, the terminal can receive the paging message and pause to receive the downlink data out of the dormant mode state.

4 is a block diagram illustrating a serving gateway server 400 (MME: Mobility Management Entity) according to an embodiment of the present invention.

4, a serving gateway server 400 according to an exemplary embodiment of the present invention may include a transmission module 401, a reception module 403, a memory 405, and a processor 407. The transmission module 401 can transmit various signals, data, and information to other servers or terminals. The receiving module 403 can receive various signals, data, and information from other servers or terminals. The processor 407 can control the operation of the entire serving gateway server 400.

The serving gateway server 400 according to an embodiment of the present invention may be configured as follows.

The processor 407 of the serving gateway server 400 determines whether the serving gateway server SGW is downlinked to the first mobility management server (MME) assigned to the first area, for the terminal in the idle mode, Link data notification message. In addition, the processor 407 can be configured to receive a tracking area update request message, in which the second MME assigned to the second area includes location information of the terminal. In addition, the processor 407 may be configured to send a bearer modification request message to the SGW in which the second MME includes location information. The SGW that has received the bearer modification request message may be configured to retransmit the downlink data notification message to the second MME. In addition, the processor 407 may be configured to implement the procedures and / or methods suggested by the present invention.

Also, the processor may be configured to determine that the paging through the first mobility management server fails if the response message to the downlink data notification message transmitted to the first mobility management server is not received during the reference time.

In addition, the processor may be configured to compare the bearer modification request message with the previously received bearer modification request message to determine a change in the location of the terminal.

In addition, the bearer modification request message may include a transport address of the second mobility management server.

Also, the processor may be configured to determine a location change of the terminal based on the transport address of the second mobility management server.

The bearer modification request message may also include a tunnel termination identifier (TEID) set to transmit packet data between the networks.

Also, the processor may be configured to determine a location change of the terminal using a call identifier used for transmission of packet data included in the tunnel ending identifier.

The embodiments described above are those in which the elements and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

Embodiments in accordance with the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) field programmable gate arrays, processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, a procedure, a function, or the like which performs the functions or operations described above. The software code can be stored in memory and driven by the processor. The memory is located inside or outside the processor and can exchange data with the processor by various means already known.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the foregoing detailed description is to be considered in all respects illustrative and not restrictive. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

400: Mobility management server
401: transmission module
403: receiving module
405: Memory
407: Processor

Claims (22)

A method for paging a terminal in a wireless communication system,
Transmitting, by the serving gateway server (SGW), a downlink data notification message to a first mobility management server (MME) allocated to a first area, for a terminal in a idle mode located in a second area;
Receiving, by the second mobility management server, a tracking area update request message including location information of the mobile station;
The second mobility management server transmitting a bearer modification request message including the location information to the serving gateway server; And
The serving gateway server having received the bearer modification request message retransmits the downlink data notification message to the second mobility management server
/ RTI > The method according to claim 1,
Further comprising performing location registration through the first mobility management server in the first area before the terminal moves to the second area. The method according to claim 1,
Further comprising the step of the terminal transmitting a location registration period message indicating the location of the terminal to the base station assigned to the terminal every location transmission period. The method of claim 3,
Further comprising the step of the second mobility management server transmitting the bearer modification request message if it is determined that the location of the terminal is changed from the first area to the second area based on the location registration period message. Paging method. The method according to claim 1,
Wherein the bearer modification request message includes a transport address of the second mobility management server. The method according to claim 1,
Wherein the bearer modification request message comprises a tunnel termination identifier (TEID) set to transmit packet data between the networks. The method according to claim 1,
Further comprising the step of determining that the paging through the first mobility management server has failed if the serving gateway server does not receive a response message for the downlink data notification message transmitted to the first mobility management server for a reference time The paging method. A paging method of a serving gateway server (SGW) for a terminal in a pause mode in a wireless communication system,
Transmitting a downlink data notification message to a first mobility management server (MME) allocated to a first region for a terminal in a idle mode located in a second region;
Receiving a bearer modification request message including the location information from a second mobility management server that has received a tracking area update request message including location information of the terminal; And
And retransmitting the downlink data notification message to the second mobility management server
/ RTI > 9. The method of claim 8,
Further comprising the step of determining that the paging through the first mobility management server has failed if the response message to the downlink data notification message transmitted to the first mobility management server is not received during the reference time. 9. The method of claim 8,
And upon receiving the bearer modification request message, comparing the received bearer modification request message with the previously received bearer modification request message to determine a location change of the terminal. 9. The method of claim 8,
Wherein the bearer modification request message includes a transport address of the second mobility management server. 12. The method of claim 11,
Further comprising determining a location change of the terminal based on a transport address of the second mobility management server. 9. The method of claim 8,
Wherein the bearer modification request message comprises a tunnel termination identifier (TEID) set to transmit packet data between the networks. 14. The method of claim 13,
Further comprising determining a location change of the terminal using a call identifier used for transmission of the packet data included in the tunnel ending identifier. A serving gateway server (SGW) connected to a mobility management server (MME) in a wireless communication system for a terminal in a idle mode,
The serving gateway server
Transmission module;
Receiving module; And
And a processor for controlling the serving gateway server including the transmitting module and the receiving module,
The processor
Transmitting a downlink data notification message to a first mobility management server (MME) allocated to a first area for a terminal in a dormant mode located in a second area,
Receiving a bearer modification request message including the location information from a second mobility management server that has received a tracking area update request message including location information of the terminal,
And to retransmit the downlink data notification message to the second mobility management server. 16. The method of claim 15,
Wherein the processor is configured to determine that paging through the first mobility management server has failed if the response message to the downlink data notification message transmitted to the first mobility management server is not received during a reference time, server. 16. The method of claim 15,
Wherein the processor is configured to, when receiving the bearer modification request message, determine a change in location of the terminal by comparing the received bearer modification request message with a previously received bearer modification request message. 16. The method of claim 15,
Wherein the bearer modification request message includes a transport address of the second mobility management server. 19. The method of claim 18,
Wherein the processor is configured to determine a location change of the terminal based on a transport address of the second mobility management server. 16. The method of claim 15,
Wherein the bearer modification request message comprises a tunnel termination identifier (TEID) set to transmit packet data between the networks. 21. The method of claim 20,
Wherein the processor is configured to determine a location change of the terminal using a call identifier used for transmission of the packet data included in the tunnel ending identifier. Instructions for transmitting a downlink data notification message to a first mobility management server (MME) allocated to a first area for a terminal in a dormant mode located in a second area;
Receiving a bearer modification request message including the location information from a second mobility management server that has received a tracking area update request message including location information of the terminal; And
And for retransmitting the downlink data notification message to the second mobility management server
And a computer readable recording medium recording the paging method.

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