KR101748246B1 - Communication supporting method and apparatus using non-access stratum protocol in mobile telecommunication system - Google Patents

Abstract

The embodiments of the present invention are directed to a method and system for solving and managing a mobile communication network using a non-connection layer protocol that enables a mobile station to perform communication by searching for an appropriate node of a network in performing communication. A communication method in a network node of a mobile communication system according to an embodiment of the present invention includes receiving, from a terminal, a first message including identification information on a terminal and related to an attach request or a tracking area update request; Identifying a type of the old network node based on the terminal related identification information; And transmitting, to the old network node, a second message for requesting context information of the UE based on the type of the old network node identified. Therefore, the present invention has an advantage in that a delay in communication with a network node can be solved in performing communication or performing communication while moving from another RAT such as EUTRAN or UTRAN / GERAN to EUTRAN.

Description

Technical Field [0001] The present invention relates to a communication method and apparatus for supporting communication using a non-layer protocol in a mobile communication system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to a mobile communication system, and more particularly, to a mobile communication system in which a terminal is connected to another Radio Access Technology (RAT) such as Evolved Universal Terrestrial Radio Access Network (EUTRAN) or Universal Terrestrial Radio Access Network (UTRAN) / GERAN (GSM / EDGE Radio Access Network) When a network node identifies an identifier of a mobile station and performs a communication with a mobile station that may occur in an environment in which the mobile station moves from the wireless access technology to the EUTRAN region or performs mobile communication after performing the communication, (NAS) protocol between the MS and the Mobility Management Entity (MME) to efficiently support a problem that may occur in a procedure for receiving information about the MS from the node ≪ / RTI >

In a typical 3rd Generation Partnership Project (3GPP) among general mobile communication systems, EPS (Evolved Packet System) is defined for next generation communication and MME is introduced as a mobility management entity of the network.

In the above mobile communication system, improvement of the NAS protocol used in the conventional mobile communication system, particularly 3G in 3GPP, has been suggested to provide a high-speed communication service in the next generation mobile communication. On the other hand, we sought to perform communication to be compatible with the conventional 3GPP 2G and 3G network nodes. In this case, when the terminal accesses the network or the terminal updates the location, the terminal identifies the network node to which the terminal has previously connected by using the node identification information of the terminal identifier.

However, to construct a network in some existing service providers, the network is composed by using bit information that represents network node identification information. To support the network mobility management node and EUTRAN in the existing business network, It is difficult to distinguish a node when searching for a corresponding node when requesting and receiving the UE-related information because it can not distinguish the introduced mobility manager (MME). Accordingly, by providing the information for appropriately searching for the previous network node corresponding to the communication between the terminal and the network through improvement of the NAS protocol or some procedures in the terminal and the mobility management node, It is necessary to propose a method of efficiently supporting the communication without delay by efficiently receiving the terminal related information.

The present invention relates to a method and apparatus for supporting a layer 2 AS (Access Stratum) and a NAS protocol in an advanced mobile communication system including 3GPP EPS, a case where a mobile station moves in an idle mode, Provided is a method and system for efficiently supporting communication between a terminal and a network node without delay in the case of accessing, performing a location update, or moving from EUTRAN or another RAT, that is, UTRAN, GERAN or the like to EUTRAN do. Further, the present invention specifies the operation of the terminal, the MME, and the SGSN using the NAS protocol, which is a protocol between the terminal and the mobility manager (MME), so that not only 3GPP EPS but also other wireless access technologies other than 3GPP EPS, Even when moving from the technology GERAN, UTRAN, EUTRAN or other access network to EUTRAN, there is no delay in communication between the terminal using the NAS and the entity acting as the terminal and the mobility manager (MME) And the like.

The present invention relates to a non-access-stratum (or non-access-stratum) network in a mobile communication network in which a terminal searches for a suitable node to be generated when performing communication with a network node, A method for performing communication between a terminal and a network using NAS protocol messages and operations according to the present invention is a method and system for solving and managing a network using a NAS (Old MME) or a previous SGSN (old SGSN) to which the UE has previously connected, and a MME (mobility management entity) In carrying out the communication process, in performing the method of receiving information on the terminal from the previous mobility manager or the previous SGSN, By supporting the method of finding the determined node, it is possible to prevent the occurrence of a delay in communication between the terminal and the network node, and to perform efficient communication. Therefore, the present invention can advantageously solve the problem of delaying communication by successfully performing the communication procedure even when moving from another RAT such as EUTRAN or UTRAN / GERAN to EUTRAN or accessing it.

According to another aspect of the present invention, there is provided a method for communicating in a network node of a mobile communication system, the method comprising: receiving a first message for identifying an attach request or a tracking area update request, Identifying a type of the old network node based on the terminal related identification information; And transmitting, to the old network node, a second message for requesting context information of the UE based on the type of the old network node identified.

According to another aspect of the present invention, there is provided a method of communicating at a terminal of a mobile communication system, the method comprising: transmitting a first message to the network node for attach request or tracking area update request including the terminal related identification information; And receiving a response message for the first message from the network node, wherein the type of the old network node of the terminal is identified based on the terminal-related identification information, and the type of the identified old network node is A second message for requesting context information of the UE is transmitted from the network node to the old network node.

According to another aspect of the present invention, a network node of a mobile communication system includes a transceiver for transmitting and receiving signals; Receiving a first message from the terminal for attach request or tracking area update request, including the terminal-related identification information, identifying the type of the old network node based on the terminal-related identification information, And a controller for transmitting a second message for requesting the context information of the UE to the old network node based on the type of the old network node identified.

The terminal of the mobile communication system according to another embodiment of the present invention includes a transmitting / receiving unit for transmitting / receiving signals; And a controller for controlling the transceiver to transmit a first message to the network node for attach request or tracking area update request including the terminal related identification information and receiving a response message for the first message from the network node, Wherein the type of the old network node of the terminal is identified based on the terminal related identification information and a second message for requesting the context information of the terminal based on the identified type of the old network node is transmitted to the network Node to the old network node.

The present invention provides a non-access-stratum (WLAN) network in a situation where a mobile station attempts to access a mobile station after moving from an EUTRAN or another RAT (GERAN, UTRAN, etc.) to an EUTRAN region, The present invention relates to a method and system for solving the problem of communication delay due to failure to acquire terminal related information from an appropriate network node in communication using a protocol (Layer: hereinafter referred to as NAS) protocol. Or by changing the operation of the terminal or the mobility manager, the terminal can smoothly perform communication with the network node, thereby achieving an efficient communication between the terminal and the network node.

1 is a block diagram illustrating a communication environment in a mobile communication system according to a preferred embodiment of the present invention.
FIG. 2 is a message flow diagram illustrating a procedure of searching for a previous access network node in a terminal access process according to an embodiment of the present invention; FIG.
FIG. 3 is a message flow diagram illustrating a process of searching for a previous access network node in a location update procedure of a terminal according to an embodiment of the present invention;
FIG. 4 is a message flow diagram illustrating a process of searching for a previous access network node in a terminal access process according to another embodiment of the present invention; FIG.
FIG. 5 is a message flow diagram illustrating a procedure of searching for a previous access network node in a location update procedure of a terminal according to another embodiment of the present invention;
FIG. 6 is an operation flow diagram of an MME for supporting a procedure of searching for a network node in performing communication according to an embodiment of the present invention; FIG.
7 is a flowchart illustrating a UE operation procedure for supporting a procedure of searching for a network node in performing communication according to another embodiment of the present invention, and
FIG. 8 is an operation flowchart of an MME for supporting a procedure of searching for a network node in performing communication according to another embodiment of the present invention.

The operation principle of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention and may be changed according to the intention or custom of the user and the operator. Therefore, the definition should be based on the contents throughout this specification.

A method for reducing a communication delay when a terminal communicates with a network node using a NAS protocol, which is a protocol between a terminal and an MME, for a mobile communication system will be described with reference to FIG. To provide a method for supporting the same. Hereinafter, an EPS system, UTRAN, and GERAN based on 3GPP will be used to describe the present invention in detail, and the present invention may be used in other mobile systems using NAS.

As shown in FIG. 1 of the present invention, the embodiment of FIG. 1 differs from the embodiment of FIG. 1 in that a terminal, which is a basic purpose of the present invention, moves from EUTRAN or another RAT to EUTRAN, This method is similar to that of other mobile communication systems having a similar technical background and channel type, or a network architecture or similar protocol or protocol, 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 by the appended claims.

1 is a block diagram illustrating a communication environment in a mobile communication system according to a preferred embodiment of the present invention. Here, the 3GPP EPS system structure is shown as an example. In the case of the present invention, a problem that may occur when moving from EUTRAN or another RAT to EUTRAN or connecting to another RAT and then connecting to EUTRAN is mainly described, and this method can also be used in other similar mobile communication systems.

Referring to FIG. 1, an evolved Node B (hereinafter, referred to as an eNB or an RNC) 112 and 133 is connected to a mobile station (Hereinafter referred to as UE or UE) 110 and performs communication. The UE 110 refers to a terminal accessing a packet data network such as the Internet through a Serving Gateway (hereinafter referred to as SGW) In this specification, a Packet Data Network GateWay (hereinafter referred to as PDN GW) 118 serves as a home agent (HA) as a main network entity of a packet data network. Meanwhile, a Mobility Management Entity (hereinafter referred to as MME), Serving GPRS Support Node (SGSN) (hereinafter referred to as SGSN) (hereinafter referred to as an SGSN) is used for management of mobility of the UE 110, location management, 135). Also, a home subscriber server (HSS) 121 is connected to the MME / SGSNs 114 and 135 via an interface to manage authentication information and service information for a user and a terminal.

Between the eNB / RNC 133 and the Serving GW 116, between the MME / SGSN 135 and the Serving GW 116 is an interface for managing a data path and mobility of the UE. The UE 110 and the MME / SGSN 135 in the present invention perform mobility management and session management by communicating with each other using the NAS protocol stack.

In the present invention, the UE 110, which is connected to the old network (hereinafter referred to as a source network) as described above, focuses on the situation where the UE 110 moves or updates its location or location. In the source network, it is assumed that a new network (hereinafter referred to as a target network) to which the UE 110 moves can support EUTRAN, which can be various RAT types such as EUTRAN, UTRAN, and GERAN. Therefore, when moving to the target network, the UE 110 is connected to the target eNB 112, the MME 114, and the HSS 121 to receive the service. Meanwhile, the MME 114 of the new network and the MME / SGSN 135 of the old network can be connected to each other to obtain necessary information. Therefore, the present invention will be described with reference to FIG. 2 through FIG. 8 with reference to the network so that the UE 110 and the MME 114 can operate efficiently based on the NAS protocol. That is, upon receiving a request message from the terminal in the mobile communication system according to the present invention, the network node determines the previous network node of the terminal by analyzing the request message. Then, the network node requests the terminal-related information of the terminal to the previous network node. Then, when receiving the information related to the UE from the previous network node, the UE transmits a response message to the UE using the UE related information.

In this case, in the mobile communication system according to the present invention, the terminal constructs a request message. Here, the terminal analyzes the request message at the network node and constructs a request message so as to determine the previous network node of the terminal. Then, the terminal sends a request message to the network node. The terminal then receives a response message corresponding to the request message from the network node.

Here, the request message includes an access request message for accessing a network node in the terminal and a location update request message for updating the location in the terminal in the network node. And the network node may be an MME, and the previous network node may be an SGSN or an MME.

2 is a message flow diagram illustrating a procedure of a terminal access procedure according to an embodiment of the present invention.

Referring to FIG. 2, step 201 is a process in which the UE 110 makes a network connection request. The Attach Request message includes identification related information for confirming the identity of the UE 110 as a P-TMSI (Packet-Temporary Mobile Subscriber Identity) signature. The P-TMSI (Packet-Temporary Mobile Subscriber Identity) signature is information that the UE 110 has for use in a subsequent connection when the UE 110 has previously connected to the SGSN and successfully performed the communication. The ATTACH REQUEST message transmitted by the UE 110 is transmitted to the MME 114 via the eNB 112 as in step 203. [

Next, the MME 114 determines the previous network node if there is an MME / SGSN 135, which is a node to which the UE 110 has previously connected, as in step 205. [ The most significant bit (MSB) of the LAC or MMEGI in identifying the location code (LAC) or MMEGI (MME group identity) in the Globally Unique Temporary Identity (GUTI) bit). In other words, if the most significant bit is 1, it recognizes EUTRAN as the connected network and UTRAN / GERAN if the most significant bit is 0, and finds MME or SGSN in each network. At this time, in some carriers, the MSB is allocated to the conventional UTRAN / GERAN as shown in FIG. 1 in some cases. Therefore, in this case, the MME 114 transmits an ATTACH REQUEST message If P-TMSI SIGNATURE is present, it can be determined that the UE 110 that sent the information has previously connected to the GERAN / UTRAN.

Next, in step 207, the new MME 114 transmits to the corresponding MME / SGSN 135 among the network nodes determined in step 205 a node that has previously performed communication with the UE 110 by using the terminal identifier IMSI (International Mobile Subscriber Identity), and an MM context (mobility management context). In step 209, the new MME 114 receives the UE-related information from the previous MME / SGSN 135. Thereafter, the authentication process and the security process of the 211 process are performed and the bearer generation process of the process 213 is performed. If a registration response (hereinafter referred to as ATTACH ACCEPT) message is transmitted from the new MME 114 to the new eNB 112 in step 215, the ATTACH ACCEPT message is retransmitted from the eNB 112 to the UE 110 in step 217 And the registration process is completed.

3 is a message flow diagram illustrating a procedure of a terminal location update process according to an embodiment of the present invention.

Referring to FIG. 3, a process 301 is a process in which the UE 110 performs a tracking area update request (TAU request) on the network. The TAU Request message includes identification related information for confirming the identity of the UE 110 as a P-TMSI signature, and information related to the UE 110 before the GERAN / And a Cipher Key Sequence Number (CKSN) for referring to a cipher key when the UTRAN is connected. If there is such a valid CKSN, P-TMSI (Packet-Temporary Mobile Subscriber Identity) signature, the UE 110 has already been connected to the SGSN and successfully performs communication. Information. The TAU REQUEST message transmitted by the UE 110 is then transmitted to the MME 114 via the eNB 112 as in step 303.

Next, the MME 114 must determine the previous network node if there is an MME / SGSN 135, which is a node to which the UE 110 has previously connected, as in step 305. [ The most significant bit (MSB) of the LAC or MMEGI in identifying the location code (LAC) or MMEGI (MME group identity) in the Globally Unique Temporary Identity (GUTI) bit). In other words, if the most significant bit is 1, it recognizes EUTRAN as the connected network and UTRAN / GERAN if the most significant bit is 0, and finds MME or SGSN in each network. At this time, in some carriers, the MSB is allocated to the conventional UTRAN / GERAN as shown in FIG. 1. In this case, the MME 114 transmits a TAU REQUEST message If there is a valid P-TMSI SIGNATURE, CKSN, it can be determined that the UE 110 that transmitted the information has previously connected to the GERAN / UTRAN.

Next, in step 307, the new MME 114 transmits to the corresponding MME / SGSN 135 among the network nodes determined in step 305 a node that has previously performed communication with the UE 110 by using the terminal identifier IMSI (International Mobile Subscriber Identity), and an MM context (mobility management context). In step 309, the new MME 114 receives the UE-related information from the previous MME / SGSN 135. Thereafter, the authentication process and the security-related process of 311 are performed, and the process of changing the Serving GateWay of the bearer in step 315 and the UE location related information is performed. In step 313, the new MME 114 acknowledges to the previous MME / SGSN 135 that the UE-related information is well received. If the location update acceptance (TAU ACCEPT) message is transmitted from the new MME 114 to the UE 110 as in step 317, the location update procedure is completed.

That is, according to an embodiment of the present invention, when a request message for a registration request or a location update request is received from a terminal, the network node checks a most significant bit of a location code or MMEGI in a temporary identifier of the terminal in a request message. If the most significant bit is 0, the network node determines the previous network node as SGSN. On the other hand, if the most significant bit is 1, the network node determines whether the request message includes at least one of a P-TMSI signature and a CKSN. Also, if the request message includes at least one of P-TMSI signature or CKSN, the network node determines the previous network node as SGSN. Or if the request message does not include a P-TMSI signature and a CKSN, the network node determines the previous network node as an MME. Then, the network node requests the terminal related information of the terminal to the previous network node, and transmits a response message to the terminal using the terminal related information.

4 is a message flow diagram illustrating a procedure of a terminal access procedure according to another embodiment of the present invention.

Referring to FIG. 4, a process 401 is a process in which a UE 110 makes a network connection request. This connection, that is, the Attach Request message, indicates that when the UE 110 transmits a temporary identifier (GUTI) of the UE 110 to the network, the identifier is allocated when the MME is connected to the MME or if a P-TMSI (Packet-Temporary Capability information indicating that the UE 110 has an ability to distinguish in advance that the network can distinguish whether it is generated from a mobile subscriber identity (RAID) or a routing area identity (RAI). One way to send this capability information is to send the information element (hereinafter referred to as IE), called UE network capability, to the parameter, or some other method. Meanwhile, the UE 110 distinguishes whether the identifier is allocated when accessing the MME or generated from information such as a Packet-Temporary Mobile Subscriber Identity (P-TMSI) and a routing area identity (RAI) through an ATTACH REQUEST message Information can be sent. Information on how the identifier is generated may be transmitted through an identifier type (ID type) of the temporary identifier of the UE 110 or may be transmitted through another information element , Or may transmit the information by distinguishing the location code (LAC) or MMEGI (MME group identity). The ATTACH REQUEST message transmitted by the UE 110 is then transmitted to the MME 114 via the eNB 112 as in step 403.

Next, the MME 114 must determine the previous network node if there is an MME / SGSN 135, which is a node to which the UE 110 has previously connected, as in step 405. [ The most significant bit (MSB) of the LAC or MMEGI is used in identifying the LAC or MMEGI in the globally unique temporary identity (GUTI) of the UE 110 in determining the previous node. In other words, if the most significant bit is 1, it recognizes EUTRAN as the connected network and UTRAN / GERAN if the most significant bit is 0, and finds MME or SGSN in each network. In this case, the MME 114 may transmit the ATTACH REQUEST message sent from the UE 110 to the MS 110. In this case, if the capability related information is set, it is determined that the UE 110 is capable of sending an identity type when sending GUTI-related information. The MME 114 refers to the identifier type field or the IE related to the identifier type information transmitted from the UE 110 and transmits the information to the MME 114. The UE 110, / UTRAN or EUTRAN.

Next, in step 407, the new MME 114 transmits to the MME / SGSN 135 among the network nodes determined in step 405 a node that has previously performed communication with the UE 110 by using the terminal identifier IMSI (International Mobile Subscriber Identity), and an MM context (mobility management context). In step 409, the new MME 114 receives the UE-related information from the previous MME / SGSN 135. Thereafter, the authentication process and the security process of the 411 process are performed and the bearer generation process of the process 413 is performed. If a registration response (hereinafter referred to as ATTACH ACCEPT) message is transmitted from the new MME 114 to the new eNB 112 as in step 415, the ATTACH ACCEPT message is retransmitted from the eNB 112 to the UE 110 in step 417 And the registration process is completed.

5 is a message flow diagram illustrating a procedure of a terminal location update process according to another embodiment of the present invention.

Referring to FIG. 5, step 501 is a process in which the UE 110 performs a tracking area update request (TAU request) on the network. This TAU REQUEST message indicates that when the UE 110 transmits a temporary identifier (GUTI) of the UE 110 to the network, the identifier is allocated when accessing the MME or a Packet-Temporary Mobile Subscriber Identity (P-TMSI) and capability information indicating that the UE 110 has the ability to preliminarily distinguish whether it is generated from a routing area identity. One way to send this capability information is to send it in the IE network capability capability parameter, or some other way. Meanwhile, the UE 110 distinguishes whether the identifier is allocated when accessing the MME or generated from information such as Packet-Temporary Mobile Subscriber Identity (P-TMSI) and routing area identity (RAI) through a TAU request message have. Information on how the identifier is generated may be conveyed via the type of identity of the temporary identifier of the UE 110 or via another information element, , Or may transmit the information by distinguishing the location code (LAC) or MMEGI (MME group identity). The TAU REQUEST message transmitted by the UE 110 is then transmitted to the MME 114 via the eNB 112 as in step 503.

Next, the MME 114 must determine the previous network node if there is an MME / SGSN 135, which is a node to which the UE 110 has previously connected, as in step 505. [ The most significant bit (MSB) of the LAC or MMEGI is used in identifying the LAC or MMEGI in the globally unique temporary identity (GUTI) of the UE 110 in determining the previous node. In other words, if the most significant bit is 1, it recognizes EUTRAN as the connected network and UTRAN / GERAN if the most significant bit is 0, and finds MME or SGSN in each network. At this time, in some carriers, the MSB is allocated to the conventional UTRAN / GERAN as shown in FIG. 1. In this case, the MME 114 transmits a TAU REQUEST message If the capability related information is set, it is determined that the UE 110 is capable of sending an identity type when sending GUTI related information. The MME 114 refers to the identifier type field or the IE related to the identifier type information transmitted from the UE 110 and transmits the information to the MME 114. The UE 110, / UTRAN or EUTRAN.

Next, in step 507, the new MME 114 transmits to the corresponding MME / SGSN 135 among the network nodes determined in step 505 a node that has previously performed communication with the UE 110 by using the terminal identifier IMSI (International Mobile Subscriber Identity), and an MM context (mobility management context). As in step 509, the new MME 114 receives the UE-related information from the previous MME / SGSN 135. Thereafter, authentication and security related processes are performed in step 511, and a process of changing the Serving GateWay of the bearer in step 515 and the UE location related information is performed. In step 513, the new MME 114 acknowledges to the previous MME / SGSN 135 that the UE-related information is well received. If the location update acceptance (TAU ACCEPT) message is transmitted from the new MME 114 to the UE 110 as in step 517, the location update procedure is completed.

That is, according to another embodiment of the present invention, when configuring a request message for a registration request or a location update request to a network node, the terminal sets an identifier type discrimination indicator for identifying a previous network node corresponding to the temporary identifier. Then, the terminal sends a request message to the network node. After that, the terminal receives a response message corresponding to the request message at the network node.

According to another embodiment of the present invention, when a request message for a registration request or a location update request is received from a terminal, the network node transmits an identifier type identification indicator for identifying a previous network node corresponding to the temporary identifier, It is determined whether or not the message is set in the message sent from the mobile terminal. This is done by confirming at the network node whether the request message includes an identifier type identification indicator. If an identifier type identifier is set in the terminal, the network node identifies the previous network node as either SGSN or MME. At this time, the network node analyzes the identifier type related information of the temporary identifier corresponding to the previous network node in the request message, and identifies the previous network node as either SGSN or MME. Then, the network node requests the terminal related information of the terminal to the previous network node, and transmits a response message to the terminal using the terminal related information.

6 is a flowchart illustrating an operation of an MME for supporting communication between a terminal and a network node according to an exemplary embodiment of the present invention.

Referring to FIG. 6, in step 701, the MME 114 receives an ATTACH REQUEST / TAU REQUEST from the UE 110. After that, the MME 114 checks the information element of the UE 110 in step 703. At this time, if the MSB of the LAC / MMEGI is 0 as in step 721, the MME 114 searches for a corresponding node among the SGSNs because the node that the UE 110 previously connected to is the SGSN as in step 723, You will be asked.

If the MSB of the LAC / MMEGI is 1 as in step 711, the MME 114 may be the MME or SGSN node to which the UE 110 previously connected. In this case, as in step 713, It checks whether the ATTACH REQUEST message contains a valid P-TMSI signature or whether the TAU REQUEST message contains at least one of CKSN or P-TMSI signature. If there is a valid CKSN or P-TMSI signature, the MME 114 proceeds to step 715 and determines that the previously communicating node is the SGSN. On the other hand, if there is no valid P-TMSI signature or CKSN information, the MME 114 determines that the node that has previously connected and communicated with is an MME as in step 717, .

At this time, the network node according to an embodiment of the present invention includes a determination unit and a control unit.

Upon receiving the request message from the terminal, the determining unit determines the previous network node of the terminal by analyzing the request message. The determination unit includes a determination unit and an identification unit. The determination unit checks the most significant bit of the location code or MMEGI in the temporary identifier of the terminal of the request message. If the most significant bit is 1, the determination unit determines whether the request message includes at least one of P-TMSI and CKSN. If the most significant bit is 0, the identification unit determines the previous network node as the SGSN. If the request message includes at least one of P-TMSI and CKSN, the identification unit determines the previous network node as the SGSN. Also, if the request message does not include P-TMSI and CKSN, the identification unit determines the previous network node as the MME.

The control unit requests the terminal-related information of the terminal to the previous network node. The control unit transmits a response message to the terminal using information related to the terminal when receiving the terminal-related information from the previous network node.

7 is a flowchart illustrating an operation of a UE for supporting a procedure of a communication process according to another embodiment of the present invention.

Referring to FIG. 7, operations may be defined differently depending on whether the UE 110 supports version release (hereinafter referred to as rel) 8 or rel 8 or rel 9, 10 or the like in step 801. In the case of the Rel 8 version, the UE 110 transmits an ATTACH / TAU REQUEST message as shown in step 819, without information or an identifier capable of indicating UE network capability or other indication as to whether it is a GUTI / Message.

On the other hand, in the case of REL 8 or later, such as REL 9, 10, etc., the UE 110 sets valid UE network capability or the like as in step 811, and in step 813, (identity type) related information is a GUTI or a MAPPED GUTIT. If the GUTI is a GUTI, the UE 110 proceeds to step 815 and informs the MME 114 of an GUTI indication through an IE associated with an identifier type field or an identifier type. If the GUTI is a mapped GUTI, The UE 110 may proceed to step 817 to inform the MME 114 of an indication of MAPPED GUTIS through an IE associated with an identifier type field or an identifier type. After that, the UE 110 transmits ATTACH / TAU REQUEST information to the network so that the related network node can be selected as in step 819.

In this case, the terminal according to another embodiment of the present invention includes a control unit and a communication unit. The control unit sets an identifier type discrimination indicator for discriminating the previous network node corresponding to the temporary identifier in the request message for the network node. Then, the control unit indicates the identifier type related information of the temporary identifier corresponding to the previous network node in the request message. The communication unit transmits a request message to the network node under the control of the control unit. The communication unit also receives a response message corresponding to the request message from the network node. 8 is a flowchart illustrating an operation of an MME for supporting communication between a terminal and a network node according to another embodiment of the present invention.

Referring to FIG. 8, in step 901, the MME 114 receives an ATTACH REQUEST / TAU REQUEST and the like from the UE 110 in step 901. In step 903, the MME 114 checks the UE network capability of the UE 110. At this time, if information related to the identifier type discrimination capability is set in the TAU REQUEST or attach request message sent from the UE, the MME 114 transmits the GUTI related information to the UE 110 You can see that you have the ability to send an identity type. The MME 114 then transmits an IE associated with the identifier type field or the identifier type in the identity type related information sent by the UE 110 based on the identifier type distinguishing capability of the UE 110 in step 911 The UE 110 that has transmitted information can determine a network node that was previously connected to the GERAN / UTRAN or EUTRAN. If the identifier type related information is GUTI, the MME 114 moves to step 917. If the identifier type related information is a GUTI, the MME 114 moves to step 917. If the identifier type related information is GUTI, And requests terminal related information. On the other hand, if it is determined as MAPPED GUTI, the MME 114 proceeds to step 913 and requests UE-related information by referring to the SGSN that previously performed communication among the SGSNs.

If the MME 114 receives the ATTACH REQUEST / TAU REQUEST message in step 903 without setting the identifier type distinguishing capability of the UE 110, the MME 114 transmits a MMTI or LAC The MSB of the SGSN is selected from among the SGSNs, and if it is 1, the SGSNs may be selected from the MMEs according to the network configuration of the provider network. In such a case, the MME 114 may utilize other separate information, such as a CKSN or a P-TMSI signature, to determine whether it is the network node from which the UE 110 previously communicated among the SGSNs.

At this time, the network node according to another embodiment of the present invention includes a determination unit and a control unit.

Upon receiving the request message from the terminal, the determining unit determines the previous network node of the terminal by analyzing the request message. The determination unit includes a determination unit and an identification unit. The determination unit determines whether an identifier type identification indicator for identifying a previous network node is set in the terminal in response to the temporary identifier. If the identifier type identification indicator is set in the terminal, the identification unit identifies the previous network node as either SGSN or MME. In this case, the identifier identifies the previous network node as either SGSN or MME by analyzing the identifier type related information of the temporary identifier corresponding to the previous network node in the request message.

The control unit requests the terminal-related information of the terminal to the previous network node. The control unit transmits a response message to the terminal using information related to the terminal when receiving the terminal-related information from the previous network node.

In order for the UE and the MME to operate as described above with reference to FIG. 2 to FIG. 8, a message IE (information element: hereinafter referred to as IE) . Hereinafter, this will be described. [Table 1] includes an information element included in a message according to the present invention to indicate whether the UE can inform the network node whether or not it has information on the identity type. I.e., octect 7 of the UE network capability IE.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by equivalents to the appended claims, as well as the appended claims.

In the present invention that operates as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

The present invention provides a non-access-stratum (WLAN) network in a situation where a mobile station attempts to access a mobile station after moving from an EUTRAN or another RAT (GERAN, UTRAN, etc.) to an EUTRAN region, The present invention relates to a method and system for solving the problem of communication delay due to failure to acquire terminal related information from an appropriate network node in communication using a protocol (Layer: hereinafter referred to as NAS) protocol. Or by changing the operation of the terminal or the mobility manager, the terminal can smoothly perform communication with the network node, thereby achieving an efficient communication between the terminal and the network node.

Claims (20)

A communication method in a network node of a mobile communication system,
Receiving from the terminal a first message including terminal related identification information and for an attach request or a tracking area update request;
Identifying a type of the old network node based on the terminal related identification information; And
And sending a second message to the old network node to request context information of the terminal based on the identified old network node type. The method according to claim 1,
Wherein the terminal related identification information includes an explicit identifier for indicating the old network type. The method according to claim 1,
The UE-related identification information includes a mobility management entity (MME) group identified or a location area code (LAC)
Wherein identifying the type of the old network node comprises:
Identifying a type of the old network node based on a specific bit of the MME group identifier or a specific bit of the LAC. The method of claim 3,
If the most significant bit (MSB) of the MME group identifier is 1, the old network node type is identified as an MME, and if the MSB of the MME group identifier is 0, the type of the old network node is SGSN packet radio service support node. The method according to claim 1,
Wherein the type of the old network node is identified as an SGSN when a valid packet-temporary mobile subscriber identity (P-TMSI) signature allocated from the old network node is included in the UE-related identification information. A communication method in a terminal of a mobile communication system,
Transmitting a first message including the UE-related identification information and requesting an attach request or a tracking area update request to a network node; And
Receiving a response message for the first message from the network node,
The type of the old network node of the terminal is identified based on the terminal related identification information,
And a second message for requesting context information of the terminal based on the identified type of the old network node is transmitted from the network node to the old network node. The method according to claim 6,
Wherein the terminal related identification information includes an explicit identifier for indicating the old network type. The method according to claim 6,
The UE-related identification information includes a mobility management entity (MME) group identified or a location area code (LAC)
Wherein the type of the old network node is identified based on a specific bit of the MME group identifier or a specific bit of the LAC. 9. The method of claim 8,
If the most significant bit (MSB) of the MME group identifier is 1, the old network node type is identified as an MME, and if the MSB of the MME group identifier is 0, the type of the old network node is SGSN packet radio service support node. The method according to claim 6,
Wherein the type of the old network node is identified as an SGSN when a valid packet-temporary mobile subscriber identity (P-TMSI) signature allocated from the old network node is included in the UE-related identification information. A network node of a mobile communication system,
A transmitting and receiving unit for transmitting and receiving signals; And
Receiving a first message including the terminal-related identification information and requesting an attach request or a tracking area update from the terminal, identifying a type of the old network node based on the terminal-related identification information, And transmitting a second message for requesting the context information of the terminal to the old network node based on the type of the identified old network node. 12. The method of claim 11,
And the UE-related identification information includes an explicit identifier for indicating the old network type. 12. The method of claim 11,
The UE-related identification information includes a mobility management entity (MME) group identified or a location area code (LAC)
Wherein the controller identifies the type of the old network node based on a specific bit of the MME group identifier or a specific bit of the LAC. 14. The method of claim 13,
If the most significant bit (MSB) of the MME group identifier is 1, the old network node type is identified as an MME, and if the MSB of the MME group identifier is 0, the type of the old network node is SGSN packet radio service support node. 12. The method of claim 11,
Wherein the type of the old network node is identified as SGSN when a valid packet-temporary mobile subscriber identity (P-TMSI) signature allocated from the old network node is included in the UE-related identification information. A terminal of a mobile communication system,
A transmitting and receiving unit for transmitting and receiving signals; And
Receiving a response message for the first message from the network node, the control message transmitting the first message for attach request or tracking area update request to the network node, Including,
The type of the old network node of the terminal is identified based on the terminal related identification information,
Wherein a second message for requesting context information of the terminal based on the identified type of the old network node is transmitted from the network node to the old network node. 17. The method of claim 16,
Wherein the terminal related identification information includes an explicit identifier for indicating the old network type. 17. The method of claim 16,
The UE-related identification information includes a mobility management entity (MME) group identified or a location area code (LAC)
Wherein the type of the old network node is identified based on a specific bit of the MME group identifier or a specific bit of the LAC. 19. The method of claim 18,
If the most significant bit (MSB) of the MME group identifier is 1, the old network node type is identified as an MME, and if the MSB of the MME group identifier is 0, the type of the old network node is SGSN packet radio service support node. 17. The method of claim 16,
Wherein the type of the old network node is identified as SGSN when a valid packet-temporary mobile subscriber identity (P-TMSI) signature allocated from the old network node is included in the UE-related identification information.

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