KR20140146819A - Apparatus and method for proceeding multi - rradio access technoligy in wireless communication system - Google Patents

Abstract

The present invention relates to a wireless communication system, and more specifically, to an apparatus and a method for wireless multiple access for efficiently supporting a request service of a terminal in a wireless communication system where one or more wireless accesses co-exist. In order to perform a wireless access to a network supporting a packet service or a network supporting a non-packet service in correspondence to a service of a user terminal, according to the present invention, disclosed is a method of updating a PLMN list, which is identification information for identifying each network in correspondence to a supportable service, in consideration of a support allowance result of a corresponding service, or checking USIM support information on a terminal for each corresponding service and controlling a terminal not to unnecessarily perform a cell reselection to a network that service support is refused to be allowed. Accordingly, the terminal does not perform an unnecessary wireless access process to a network where a service is not supported, but performs cell reselection to a network where the service is supported, thereby providing advantages that efficiency of cell reselection is ensured, and efficiency of handover between wireless access networks is also ensured since unnecessary signaling does not occur according to cell reselection between networks.

Description

[0001] APPARATUS AND METHOD FOR PROCESSING MULTI-RRADIO ACCESS TECHNOLOGY IN WIRELESS COMMUNICATION SYSTEM [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system, and more particularly, to a multiple wireless access apparatus and method for efficiently supporting a requested service of a terminal in a wireless communication system in which one or more wireless connections coexist.

Recently, LTE (Long Term Evolution) system, a next generation wireless communication system, has been commercialized in earnest. This LTE system is spreading more rapidly after recognizing the need to support high-quality services for voice services as well as high-capacity services for users' needs while ensuring the activity of terminal users. The LTE system provides low transmission delay, high data rate, system capacity and coverage improvement.

On the other hand, considering the needs of service providers providing services to users, LTE system can improve performance by improving existing radio access and network, (Universal Mobile Telecommunication System) based on a 2G communication system and a Wideband Code Division Multiple Access (W-CDMA) system, which are GSM (Global System for Mobile Communications) And is compatible with 3G communication systems and is being developed into a coexistence mode.

For example, LTE systems that support packet-based services offer more than 5 times higher data rates than existing wireless communication systems due to their flexibility and efficiency based on IP. There is an evaluation that the service quality is insufficient as compared with the voice service in the existing circuit domain.

Accordingly, there is a need for an efficient wireless connection to an appropriate network to satisfy a user's demand in a wireless communication system in which different wireless communication systems coexist. This means that a specific inter-network handover and a specific wireless connection processing operation for the terminal to apply the multiple access technology in the wireless communication system need to be presented. Accordingly, the wireless connection for the different wireless communication systems There is a need for concrete measures on how to do this.

SUMMARY OF THE INVENTION The present invention provides a wireless access apparatus and method for efficiently supporting a requested service of a multi-access terminal in a wireless communication system.

It is another object of the present invention to provide a wireless access apparatus and method for efficiently supporting packet service of a terminal in a wireless communication system supporting multiple wireless access.

It is another object of the present invention to provide a wireless access apparatus and method for efficiently supporting non-packet service of a terminal in a wireless communication system supporting multiple wireless access.

It is another object of the present invention to provide an apparatus and method for efficiently performing a handover between wireless communication network systems for a multi-radio access terminal in a wireless communication system.

It is another object of the present invention to provide an apparatus and method for supporting a registration procedure considering a service of a multi-radio access terminal in a wireless communication system.

The present invention also provides a network access apparatus and method suitable for service of a terminal in a wireless communication system supporting multiple wireless access technologies.

In addition, the present invention provides an apparatus and method for restricting wireless access in consideration of services of a terminal in a wireless communication system supporting multiple wireless access technologies.

The present invention also provides a radio access apparatus and method for maintaining service continuity of a terminal in a radio communication system supporting multi-radio access technology.

According to an aspect of the present invention, there is provided a method of performing multiple wireless access in a wireless communication system, the method comprising: transmitting a registration message requesting packet or non-packet service to a MME; Receiving a registration rejection message indicating that a packet service is not allowed in a network to which the terminal is wirelessly connected; and receiving, from a list including identification information (PLMN) for wireless access networks supported by the terminal, Updating the list by deleting at least one or more networks supporting the service, and performing cell reselection with reference to the updated list.

According to an aspect of the present invention, there is provided a terminal apparatus for performing multiple wireless connections in a wireless communication system, the terminal apparatus comprising: a MME for transmitting a registration message requesting packet or non-packet service to a MME, Receiving unit for receiving a registration rejection message indicating that packet service is not allowed in a wirelessly connected network; a registration rejection message transmitted from the transceiver unit and identifying identification information of wireless access networks supported by the terminal; (PLMN) management unit for updating the list by deleting at least one or more networks supporting the packet service in a list including a PLMN or a validity of a packet or non-packet service of a subscriber identity module (USIM) A service support confirmation unit including a USIM management unit, According to the switch control portion support check is characterized in that it comprises a cell selection to perform the cell reselection.

In a wireless communication environment in which different wireless communication systems coexist, updating the PLMN list, which is identification information for the network, corresponding to the service of the terminal, or checking the USIM support information of the terminal for each service, In order to prevent the connection between them. This is to provide the efficiency of the network connection by limiting whether the packet service domain or the circuit service domain can be accessed in response to the requested service of the terminal by allowing the network or validating the USIM of the terminal.

Accordingly, the present invention has an advantage of supporting handover between heterogeneous networks adaptively to user services based on a packet-based optimized network structure, thereby maximally ensuring user service. In addition, since unnecessary wireless connection of the terminal is prevented and an unnecessary wireless connection procedure with the network is not performed, effective handover efficiency between the wireless access network for the terminal as well as efficient wireless connection is maximally ensured I have.

1 is a diagram schematically illustrating a structure of a next generation wireless communication system to which the present invention is applied.
2 is a block diagram illustrating a radio protocol architecture for a user plane to which the present invention is applied.
3 is a block diagram illustrating a wireless protocol structure for a control plane to which the present invention is applied.
4 is a diagram schematically illustrating a radio access procedure of a UE supporting multiple access in a wireless communication system to which the present invention is applied.
5 is a diagram schematically illustrating a procedure for supporting a requested service of a terminal in a wireless communication system including various radio access networks according to a first embodiment of the present invention.
6 is a diagram schematically illustrating a procedure for supporting a requested service of a terminal in a wireless communication system including various radio access networks according to a second embodiment of the present invention.
7 is a diagram schematically illustrating a procedure for supporting a requested service of a terminal in a wireless communication system including various radio access networks according to a third embodiment of the present invention.
FIG. 8 is a flowchart illustrating an operation of a terminal that performs multiple wireless connections using a Public Land Mobile Network (PLMN) list according to the present invention.
FIG. 9 is a block diagram illustrating a structure of a terminal for performing a multiple access connection by checking whether a subscriber identity module (USIM) supports service according to the present invention.
10 is a block diagram briefly showing a structure of a terminal according to the present invention.

Hereinafter, some embodiments will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments 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 disclosure rather unclear.

The present invention will be described with reference to a communication network. The work performed in the communication network may be performed in a process of controlling the network and transmitting data by a system (e.g., a base station) that manages the communication network, The work can be done.

The present invention provides an improved Evolved Packet System (EPS) service in consideration of service of a terminal in a wireless communication system in which an access network supporting the next generation wireless communication and an access network supporting 2G / 3G wireless communication coexist, Here, a concrete operation of a specific terminal that performs cell selection to a network supporting a packet service or a network supporting a non-packet service is started. I want to.

1 is a schematic view illustrating a structure of a next generation wireless communication system to which the present invention is applied. This discloses the network structure of an E-UMTS (Evolved-Universal Mobile Telecommunications System). The E-UMTS system is called a LTE (Long Term Evolution) or LTE-A (advanced) system and is a packet-based system for providing various communication services such as voice and packet data.

Referring to FIG. 1, an E-UTRAN includes a base station 20 (eNB) that provides a control plane and a user plane to a user equipment (UE) 10. The terminal 10 may be fixed or mobile and may be referred to by other terms such as a mobile station (MS), an advanced MS (MS), a user terminal (UT), a subscriber station (SS) .

The base station 20 generally refers to a station that communicates with the terminal 10 and includes a base station (BS), a base transceiver system (BTS), an access point, a femto-eNB, A pico-eNB, a home eNB, a relay, or the like. The base station 20 can provide services to the terminal through at least one cell. The cell may mean a geographical area where the base station 20 provides communication services, or may refer to a specific frequency band. A cell may denote a downlink frequency resource and an uplink frequency resource. Or a cell may mean a combination of a downlink frequency resource and an optional uplink frequency resource. In this regard, in the LTE system, it is possible to provide an effect similar to the use of one large band band logically by bundling a plurality of physically continuous or non-continuous bands in the frequency domain, To provide high data rate.

The base stations 20 may be interconnected via an X2 interface. The base station 20 is connected to an S-GW (Serving Gateway) through an MME (Mobility Management Entity) and an S1-U through an EPC (Evolved Packet Core) 30, more specifically, an S1-MME through an S1 interface. The S1 interface exchanges OAM (Operation and Management) information to support the movement of the terminal 10 by exchanging signals with the MME.

The EPC 30 includes an MME, an S-GW, and a Packet Data Network-Gateway (P-GW). The MME has information on the connection information of the terminal 10 and the capability of the terminal 10. This information is mainly used for managing the mobility of the terminal 10. [ The S-GW is a gateway having an E-UTRAN as an end point, and the P-GW is a gateway having a PDN (Packet Data Network) as an end point.

The E-UTRAN and the EPC 30 may be combined to form an EPS (Evolved Packet System), and the traffic flow from the wireless link to the base station 20 to the PDN connecting the terminal 10 to the service entity (Internet Protocol).

The wireless interface between the terminal and the base station is called a Uu interface. The layers of the radio interface protocol between the UE and the network are classified into L1 (first layer), L1 (second layer), and the like based on the lower three layers of the Open System Interconnection (OSI) A physical layer belonging to a first layer provides an information transfer service using a physical channel, and a physical layer (physical layer) An RRC (Radio Resource Control) layer located at Layer 3 controls the radio resources between the UE and the network. To this end, the RRC layer exchanges RRC messages between the UE and the BS.

2 is a block diagram illustrating a radio protocol architecture for a user plane. 3 is a block diagram illustrating a wireless protocol structure for a control plane. The user plane is a protocol stack for transmitting user data, and the control plane is a protocol stack for transmitting control signals.

2 and 3, a physical layer (PHY) layer 210 provides an information transfer service to an upper layer using a physical channel. The physical layer is connected to a medium access control (MAC) layer, which is an upper layer, through a transport channel. Data is transferred between the MAC layer and the physical layer through the transport channel. The transport channel is classified according to how the data is transmitted through the air interface. Data is transferred between the different physical layers, that is, between the transmitter and the physical layer of the receiver through a physical channel. The physical channel can be modulated by an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and uses time and frequency as radio resources. There are several physical control channels. The physical downlink control channel (PDCCH) informs the UE of resource allocation of a paging channel (PCH), a downlink shared channel (DL-SCH), and hybrid automatic repeat request (HARQ) information related to the DL-SCH. The PDCCH may carry an uplink scheduling grant informing the UE of the resource allocation of the uplink transmission. A physical control format indicator channel (PCFICH) informs the UE of the number of OFDM symbols used for PDCCHs and is transmitted every subframe. PHICH (Physical Hybrid ARQ Indicator Channel) carries HARQ ACK / NAK signal in response to uplink transmission. A physical uplink control channel (PUCCH) carries uplink control information such as HARQ ACK / NAK, scheduling request and CQI for downlink transmission. A physical uplink shared channel (PUSCH) carries an uplink shared channel (UL-SCH).

The function of the MAC layer 220 is to perform mapping / demultiplexing to a transport block provided on a physical channel on a transport channel of a MAC SDU (service data unit) belonging to a logical channel and a mapping between a logical channel and a transport channel . The MAC layer provides a service to a Radio Link Control (RLC) layer through a logical channel. The logical channel can be divided into a control channel for transferring control area information and a traffic channel for transferring user area information.

The function of the RLC layer 230 includes concatenation, segmentation and reassembly of the RLC SDUs. In order to guarantee various QoS (Quality of Service) required by a radio bearer (RB), the RLC layer includes Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode , And AM). AM RLC provides error correction via automatic repeat request (ARQ).

The functions of the Packet Data Convergence Protocol (PDCP) layer 240 in the user plane include transmission of user data, header compression and ciphering. The function of the Packet Data Convergence Protocol (PDCP) layer in the user plane includes transmission of control plane data and encryption / integrity protection.

The RRC layer 250 of FIG. 3 performs functions such as broadcast, paging, RRC connection management, RB control, mobility, and UE measurement of system information related to the NAS / AS. In particular, temporary ID assignment and radio resource setting for RRC connection are performed for setting up, managing, and releasing RRC connection between UE and E-UTRAN. That is, it is responsible for the control of the logical channels, the transport channels and the physical channels in connection with the configuration, re-configuration and release of the RBs. RB means a logical path provided by a first layer (PHY layer) and a second layer (MAC layer, RLC layer, PDCP layer) for data transmission between a UE and a network. The configuration of the RB means a process of defining characteristics of a radio protocol layer and a channel to provide a specific service, and setting each specific parameter and an operation method. The RB may be further classified into an SRB (Signaling RB) and a DRB (Data RB). The SRB is used as a path for transmitting the RRC message and the NAS message in the control plane, and the DRB is used as a path for transmitting the user data in the user plane.

In addition, the RRC layer 250 may perform mobility measurement between UEs and RAT (Radio Access Technology), UE handover, UE cell selection and reselection, context transmission between eNBs, UE measurement report, .

The NAS (Non-Access Stratum) layer located at the top of the RRC layer performs functions such as session management and mobility management.

When there is an RRC connection between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in an RRC connected state. Otherwise, the UE is in an RRC idle state do.

4 is a diagram schematically illustrating a procedure for supporting a requested service of a terminal in a wireless communication system including various radio access networks to which the present invention is applied.

Referring to FIG. 4, a terminal 400 supports a Multi-Radio Access Technology (hereinafter referred to as 'Multi-RAT' or 'Multiple Access Mode'). The UE supporting the Multi-RAT includes the E-UTRAN 410, the GERAN (Enhanced Data Rates for GSM Evolution) / UTRAN (Enhanced Data Rates for GSM Evolution) The terminal 400 is connected to the UMTS Terrestrial Radio Access Network 430 and can support the EPS service provided in the packet domain and the non EPS provided in the circuit domain. The terminal 400 is located in the E-UTRAN 410 I suppose.

In order to support EPS (non-EPS) / non-EPS (hereinafter referred to as non-EPS) service, the AT 400 transmits a registration request (Attach Request) to the MME 420, , 450). The registration request message includes EPS / non-EPS registration request information, which is information on whether the terminal 400 supports the packet / non-packet service. Also, the registration request message is performed through a combined access procedure, and the terminal 400 attempts to register its location in the MME 420.

Here, the MME 420 is an evolved packet core (EPC) network, and includes NAS signaling (NAS signaling), AS security control (AS signaling), and mobility control (UE in idle and active mode), SGSN selection for handover to a 2G / 3G access network, roaming, and the like. That is, the MME 420 controls a wireless link and a wired link, and controls the terminal 400 to access a network of another communication system or a network under the network management of the corresponding system. 400) and control functions necessary for efficient operation of frequency resources.

When the MME 420 confirms that there is a problem in the terminal 400 regarding the provision of the EPS service, the MME 420 transmits a registration rejection request including an EPS mobility management (EMM) ATTACH REJECT, 460) message to the terminal 400. In the present invention, the registration rejection message is described as '# 7 EPS Service not allowed', which means that the EPS service is not authorized. Accordingly, the terminal 400 can not support the EPS service of the terminal 400 through the registration rejection message transmitted from the MME 420, and recognizes that the location registration in the MME 420 fails. This confirms that any operation for providing the EPS service is impossible using the current USIM installed in the terminal 400. [

Meanwhile, the terminal 400 selects an access network other than the E-UTRAN 410 (Inter-RAT Reselection) as a multi-RAT terminal and transmits a non-EPS service in addition to the EPS service It is a UE that can support. The terminal 400 selects a cell (re-selection) to the GERAN 430 through a measurement procedure and then transmits a location update message to the Mobile Switching Center (MSC) , 480) request message. The MSC 430 notifies the location registration to the terminal 400 is successfully performed for the non-EPS service through a LOCATION UPDATING ACCEPT message. Therefore, the terminal 400 performs wireless connection to one (selected) cell 430 of the GERAN and the UTRAN, and supports the non-EPS service through the wireless connection.

In order to support the EPS service in step 460, the terminal 400 turns off the power of the terminal and newly starts the wireless setup procedure with the E-UTRAN, There is a restriction to remove the loaded Universal Subscriber Identity Module (USIM). These constraints are as follows. This is an operation of the terminal defined in the wireless communication system, and the terminal must comply with the following operation.

1. Combined attach not accepted by the network; If the terminal performs a combined ATTACH procedure in the LTE network for location registration but is rejected by the network,

2. Combined tracking area updating procedure not accepted by the network; If the terminal performs a combined TAU procedure on the network for location registration and circuit switch service but is rejected by the network

3. Network initiated detach procedure completion by the UE; When the LTE network performs the MT Detach procedure to release the location registration of the UE

If the EPS service is not permitted in steps 1, 2, and 3 (# 7 (EPS services not allowed)), the UE sets the EPS update state to the roaming- status to EU3 ROAMING NOT ALLOWED), the EPS service is deemed to be invalid until the USIM is removed, or the USIM is removed (the UE shall consider consider the USIM) as invalid for EPS services until switching off or the UICC (Universal Integrated Circuit) containing the USIM is removed.

- or the UE can not perform cell reselection to the E-UTRAN until the UE is powered off or the USIM is removed (The UE shall not reselect the U-RTR radio access technology until switching off or the UICC containing the USIM is removed ).

In the case where the terminal is deprived of the EPS service from the network in the location registration process, the terminal is no longer able to receive the EPS service unless the power is turned off or the USIM is replaced, There is a problem that the wireless connection can not be smoothly performed by the network according to the supportable service.

Accordingly, the present invention provides a cell reselection method of a UE capable of maximally providing a service requested by a user according to the above constraint, and a method of quickly performing Inter-RAT (IRAT) reselection for cell reselection of a UE between networks . In other words, if the terminal that is registered in the E-UTRAN to provide the EPS service is unable to provide the EPS service, a wireless access procedure that can provide the service requested by the user and other supportable services is proposed do.

5 is a diagram schematically illustrating a procedure for supporting a requested service of a terminal in a wireless communication system including various radio access networks according to a first embodiment of the present invention.

Referring to FIG. 5, the UE 501 is located in the E-UTRAN, the 4G EM Mobility Management 502 is in the active state and the 3G 503 / 2G 504 is in the inactive state (INACTIVE) state. Here, the active state means that the terminal 501 is allocated a radio resource from the current network to receive the service, that is, a radio access (RAT) is performed with the corresponding network. This means that the UE 501 is configured with a radio resource control (RRC) connection with the E-UTRAN.

Meanwhile, the 4G EMM 502, which is the active state, is in the EMM-DEREGISTERE_NORMAL state, and the state of the terminal 501 is not yet registered (ATTACH) to the upper network. That is, there is no information related to the mobility support of the UE 501, that is, there is no UE context related to the mobility. Here, the registration / connection state of the 4G EMM 502 can be transitioned to an idle state or a connected state (Connected) with respect to the mobility of the terminal according to the PLMM cell selection procedure of the terminal 501, It is also related to the state.

The 4G EMM 502 includes a registration procedure (ATTACH) with a procedure related to Global Unique Temporary Identifier (GUTI) assignment, authentication, UE identification, security mode control, and user mobility Update (TAU) procedure. That is, the 4G EMM 502 supports PLMN cell selection to support a service requested by the UE and UE registration process in a specific network supporting the UE to support wireless connection to the UE in the corresponding network.

In step 510, the AT 501 transmits an ATTACH REQUEST message including information for supporting the EPS / non-EPS service to the MME 506. The MME 506 may be configured to authenticate the wireless connection to the terminal, secure the communication to the abnormal user using the encryption key and the random protection key for the terminal 506 and the mobility of the terminal 506 Recording and tracking are performed. The MME 506 confirms whether the terminal is capable of supporting the EPS and the non-EPS service by checking the related information of the terminal 501, for example, the capability information of the terminal, And determines whether or not to permit the registration request by confirming whether the terminal is allowed to register for the terminal, mobility and radio access for setting the resource in the corresponding network.

Table 1 below is an example of terminal related information that can be included in the registration request message.

<UE related Information>
EPS capability: Enabled
Supported RAT: E-UTRAN, UTRAN, GERAN
UE support EPS / non-EPS service

Meanwhile, the terminal 501 has information on a network identification number (Public Land Mobile Network (PLMN)) of each provider in the form of a list, and identifies the provider of the list in association with the EPS / non-EPS service support Is distinguished by PLMN ID. This can be in the form of Table 2 below.

Through the PLMN list, the terminal 501 can select a corresponding PLMN to perform wireless connection and perform cell selection with respect to its own EPS / non-EPS service support. That is, considering the support of the service requested by the user by using the PLMN list, that is, whether EPS / non-EPS service is supported, it is possible to attempt wireless connection to the corresponding network.

<PLMN List>
Plmn Id: Supported RAT
111 222: E-UTRAN
222 333: E-UTRAN, UTRAN
333 444: UTRAN
444 555: UTRAN, GERAN
555 666: E-UTRAN, GERAN

Upon receipt of the registration request message in step 510, the MME 506 confirms that the EPS service can not be supported in the E-UTRAN wirelessly connected by the terminal 501. In step 520, REJECT message to the terminal 501. This means that the EPS service support for the terminal 501 is not allowed, which means that the terminal 501 has to support another service by performing wireless connection to another network.

The UE 501 confirms the reason for the service rejection in the ATTACH REJECT message and updates the PLMN list managed by the UE 501 with reference to the reason. In the present invention, the case where the refusal reason is '# 7 EPS service is not allowed' will be described.

Therefore, the terminal 501 updates the network identification number that can not support the EPS service by referring to the # 7 EPS service is not allowed. For example, the UE 501 updates the PLMN list by deleting '111 222: E-UTRAN' supporting only the EPS service as shown in Table 3, or '111 It is possible to manage the PLMN list in such a manner that all the PLMNs that can support the EPS service are deleted, such as '222: E-UTRAN', '222 333: E-UTRAN, UTRAN', '555 666: E-UTRAN, GERAN'

<PLMN List>
Plmn Id: Supported RAT
222 333: E-UTRAN, UTRAN
333 444: UTRAN
444 555: UTRAN, GERAN
555 666: E-UTRAN, GERAN

<PLMN List>
Plmn Id: Supported RAT
333 444: UTRAN
444 555: UTRAN, GERAN

That is, the UE 501 deletes the PLMN ID that can not support the EPS service, and updates the PLMN list. And updates the range of the PLMN list for cell reselection to perform cell reselection only for PLMNs in the updated PLMN list (560). Accordingly, when the UE 501 reselects a cell, it tries to prevent a network connection attempt to unnecessary candidate cells in advance.

In step 532, the 4G EMM 502 requests the 4G-RRC layer 506 to delete the PLMN list, and the EPS service of the terminal 501 And prevents cell reselection to the E-UTRAN according to the impossibility of support. In step 534, an initial PLMN selection procedure for service recovery of the UE is requested. In the PLMN selection procedure, it is controlled whether there is no PLMN selection request to the 4G-RRC layer 506 for which the EPS service support is not allowed (step 536). Only the 3G RRC 508 or the 2G RR The procedure controls the PLMN selection procedure so that there is a PLMN selection request to the PLMN selection procedure 509 (step 538).

In step 530, the UE 501 that has updated the PLMN list identifies PLMNs for supporting non-EPS services, that is, cells of the network that can support the service. For example, 'PLMN ID: 555 666' having a relatively good channel status in the updated PLMN list of Table 3 can be selected as a network for supporting non-EPS service. At this time, the UE 501 determines that the E-UTRAN of the 'PLMN ID: 555 666' is INVALID and the GERAN is in the VALID state.

In step 560, the UE 501 performs cell reselection from the E-UTRAN 502 to the GERAN 504 and receives radio resources from the GERAN 504. Accordingly, the 2G 504 that has completed the wireless connection to support the non-EPS service transitions to the active state (ACTIVE), and the 4G EMM 502 / 3G 503 transitions to the inactive state (INACTIVE RAT). In step 570, the UE 501 transmits a Location Update Request message to the GERAN 504 to request approval of the service support for supporting the Non-EPS service.

As described above, according to the present invention, when a UE supporting a multi-RAT mode can not provide a user-requested service in a currently located RAT, it performs a PLMN list update for a service-denied network To prevent wireless connection to an unnecessary PLMN network at the time of cell reselection. That is, the PLMN ID is deleted from the PLMN list, which is a reference when reselecting a cell in the UE, and Equivalent PLMN list update 534 is performed when performing an initial PLMN selection procedure between networks, To prevent the inter-RAT change procedure from being performed.

In another example of the present invention, a method for updating a USIM equipped with a terminal with an 'Invalid USIM' that is not valid for an EPS service and managing the EPS when the EPS service is not allowed by the network is explained. This will be described in steps 550, 552, 554, and 556.

In step 520, the 4G EMM 502 confirms that the USIM of the terminal can not support the EPS service, and notifies the terminal 501 of the request including the ATTACH REJECT message. The terminal 501 confirms the reason for the EMM in the ATTACH REJECT message (see Table 5) and confirms that the EPS service is not supported. Also, the terminal 501 updates information on its USIM.

In other words, the 4G-EMM 502 updates the USIM validity of the UE 501 to a USIM that is only CS domain service (552). Accordingly, the PLMN entity 505 controls the PLMN selection procedure and the network-to-network RRC procedure to check the validity of the USIM before performing the PLMN search so as not to occur in the unnecessary network (554). Through the USIM validation, the E-UTRAN is regarded as a non-conforming cell in the RAT handover procedure in the network (USIM_VALID_FOR_CS_ONLY means E-UTRAN is not considered as RAT Check). The USIM information updated in the UE 501, the network 502, and the PLMN 505 are shown in Table 6 below.

Update
UsimValidity
to USIM_VALID_FOR_CS_ONLY

Update UsimValidity according to received emm cause
1) USIM_VALID_FOR_PS_ONLY
=># 2 IMSI unknown in HSS
2) USIM_VALID_FOR_CS_ONLY
=># 7 EPS service not allowed
3) USIM_INVALID_FOR_CS_AND_PS
=># 3 Illegal UE
# 6 Illegal ME
# 8 EPS services and non-EPS services not allowed
4) USIM_VALID_FOR_CS_AND_PS
=> other causes

As described above, the UE 501 updates and maintains USIM validity according to the service domain. When the PLMN is selected, the UE 501 refers to the USIM validity to determine the range of the PLMN search, that is, . Therefore, the efficiency of inter-RAT between the networks is improved by preventing cell search reflecting the unnecessary PLMN.

6 is a diagram schematically illustrating a procedure for supporting a requested service of a terminal in a wireless communication system including various radio access networks according to a second embodiment of the present invention.

Referring to FIG. 6, in step 610, the terminal 601 performs a registration request (ATTACH REQUEST) to support the EPS / non-EPS service to the MME 606, Confirm that the registration request is rejected.

In step 630, the UE 601 confirms that the EPS service can not be supported in the currently wirelessly connected E-UTRAN through the registration request rejection message, and updates the PLMN list managed by the E-UTRAN. That is, the range of the candidate networks for the initial PLMN selection is adjusted by confirming the IDs of the PLMNs supporting the EPS service, deleting the PLMNs selectively from the PLMN list, and eliminating them in advance in the cell reselection of the terminal. Thereby allowing the cell reselection to be performed quickly only for the PLMN in the updated PLMN list.

In addition, unnecessary signaling for the request / search result of the inter-RAT procedure between the E-UTRAN and the GERAN / UTRAN is prevented by updating the PLMN list, thereby providing promptness and efficiency of Inter-RAT change (632, 634, 636 , 638).

In step 660, the UE decides to reselect the cell due to the failure of the EPS service. However, as a result of the interference with the GERAN and the UTRAN supporting the non-EPS service, the UE can not find a suitable cell for cell reselection It is determined not to perform cell reselection. Accordingly, it is determined that the inter-RAT handover procedure is not performed between the networks.

In another exemplary embodiment of the present invention, if the USIM of the MS is notified of an 'Invalid USIM' that is not valid for the EPS service as a result of checking whether the USIM is valid from the MME 606 in step 620, To update information about the user's USIM.

Therefore, the signaling between the networks in the PLMN selection procedure and the signaling with the UE 501 allow signaling between the USIM-validated networks, i.e., only the CS domain service-only networks. Nevertheless, the PLMN search and the inter-RAT handover procedure are performed with reference to the validity value, but the UE does not check the appropriate GERAN / UTRAN supporting the Non-EPS service, and the UE does not perform the cell selection procedure at all (660).

7 is a diagram schematically illustrating a procedure for supporting a requested service of a terminal in a wireless communication system including various radio access networks according to a third embodiment of the present invention.

Referring to FIG. 7, in step 730, the UE 701 can not support the EPS service in the currently wirelessly connected E-UTRAN through the registration request rejection message, and updates the PLMN list managed by the UE 701 itself. That is, PLMNs supported by the EPS service are identified, the corresponding PLMNs are selectively deleted from the PLMN list, and the PLMN selection range for cell reselection of the terminal is adjusted later. It has prevented unnecessary signaling of the request / search result of the Inter-RAT procedure between E-UTRAN and GERAN / UTRAN. Nevertheless, the terminal 701 determines to support the EPS emergency service through the emergency attendance procedure (760) in order to support the EPS service according to the user's needs.

For example, as shown in Table 7 below, although the E-UTRAN confirms that the EPS service support is not allowed through the PLMN list update, it tries to support the user's request as much as possible through the emergency registration procedure.

Found PLMN ID: 111 222
Supported RAT:
E-UTRAN (INVALID)

Accordingly, the terminal 701 is located in the E-UTRAN and the registration / connection state of the 4G EMM (EPS Mobility Management) 502 is in an active state (ACTIVE RAT), and the 3G 503 / 2G 504 is inactivated And the AT 701 transmits an ATTACH REQUEST message including information for supporting the EPS emergency service to the MME 706.

The present invention provides a method for requesting a wireless connection to the MME 706 through a currently located E-UTRAN when the terminal is wirelessly connected to a network that can not support the EPS service, .

Accordingly, when the emergency EPS service is required, the terminal provides an advantage of performing an emergency service through a currently connected wirelessly connected network without searching for an unnecessary PLMN cell.

FIG. 8 is a flowchart illustrating an operation of a terminal performing multiple wireless connections through updating of a PLMN list according to the present invention. Meanwhile, FIG. 9 is a block diagram illustrating a structure of a terminal for performing a multiple access connection by confirming whether a subscriber identity module supports a service according to the present invention.

8 and 9, the terminal is a terminal capable of performing wireless connection to the GSM, UMTS, and LTE systems, and wirelessly accesses the LTE system to support the EPS service, or wirelessly accesses the GSM / . The terminal supporting the wireless connection of the LTE system and the GSM / UMTS system starts the registration procedure with the MME managing the wireless connection of the LTE system.

Referring to FIG. 8, the MS transmits an ATTACH REQUEST message to the MME. In this case, the MME confirms the subscription information about itself and confirms whether the EPS service can be supported in the service area of the presently located E-UTRAN (S810, S910).

 The terminal receives the response message for the registration request from the MME (S820, S920). At this time, the terminal which has confirmed that the response message is the registration rejection, the reason why the rejection reason is '# 7 EPS service is not allowed' Confirm whether it is. This may occur when a large number of terminals temporarily fail to manage the registration request in the network supporting the EPS service or it is determined that the EPS service is impossible as a result of checking the subscription information of the terminal.

The UE confirms the PLMN list managed by the EPS / non-EPS service support by referring to the registration rejection reason indicating that the EPS service of the response message is not supported, Selectively delete the corresponding PLMN that supports the EPS service. At this time, in step S830, the UE deletes the PLMN ID determined to be impossible to support the specific service from the list by considering the reason for rejection in the received ACK message, and updates the PLMN list.

The UE performs cell reselection based on the updated PLMN list (S840). At this time, PLMNs that can not support a specific service are already deleted in the PLMN list, and the UE does not perform a wireless connection to a network for which a specific service is not supported. In case of inter-RAT handover support, unnecessary handover procedure does not occur to a network of a system in which services are not supported between networks. Therefore, the present invention has an advantage of providing not only the signaling efficiency for cell reselection of the UE but also the efficiency of a handover procedure between networks.

In addition, the UE, which has confirmed that the EPS service is not supported, selects a cell from a GSM or UMTS system supporting a non-EPS service and has a good channel state to perform wireless connection. The non-EPS service is supported in the selected cell in which the wireless connection is completed. In accordance with the present invention, a terminal receiving the registration rejection including the '# 7 EPS service not allowed' is powered on after the power is turned off, or after the USIM is removed, the terminal for the EPS service using the same USIM / You may try a new registration.

Meanwhile, the terminal may regard the EPS capability related to its own EPS service as being enabled (enabled), disabled (disabled), and may prevent the cell selection to the E-UTRAN in advance. It may update the UE related information as shown in Table 8. [

<UE related Information>
EPS capability; Enabled → disabled
Supported RAT: E- UTRAN , UTRAN, GERAN → UTRAN, GERAN
UE support EPS / non-EPS service → UE support non-EPS service only

[0040] To be more specific, the terminal receiving the registration rejection from the network that can not support the high-speed packet service in the E-UTRAN performs wireless connection with the GSM or UMTS channel in good channel state, (See FIG. 5). In addition, according to the present invention, a terminal that receives registration rejection from a network that can not support high-speed packet service in the E-UTRAN fails to perform a wireless connection to any system , The power supply may be turned off, or a new wireless connection may be performed by replacing the USIM (see FIG. 6). In addition, according to the present invention, a terminal that has received a registration rejection from a network that can not support high-speed packet service in the E-UTRAN may request wireless terminal registration by requesting emergency EPS service registration from the rejected E-UTRAN (refer to FIG. 7) .

Referring to FIG. 9, the MS performs a registration request with the MME and receives a registration reject message including service validity information for its USIM from the MME (S920). And updates information about service domains that satisfy the validity based on the received USIM validity information. For example, the MS updates its USIM validity to the CS domain only (S930). The cell reselection is performed in consideration of the confirmed validity information (S940). Performs wireless connection to the selected cell, and receives a supported service (S940).

According to the present invention, the terminal can not support the EPS service with the USIM which is not valid in the normal mode, but supports the EPS service in the emergency mode. Therefore, the terminal may perform cell selection in the same form as shown in FIG.

10 is a block diagram briefly showing a structure of a terminal according to the present invention.

10, the terminal 1000 may include a transceiver 1100, a service support confirmation unit 1200, and a cell re-selection unit 1300. [

The transceiver 1100 transmits and receives the location of the terminal or the registration request / response (rejection) message to the service support confirmation unit 1200.

The service support confirmation unit 1200 includes a PLMN management unit 1210 for managing identification information of networks supporting a specific service, a USIM management unit 1250 for managing USIM effectiveness for each service of a terminal, And a UE information management unit 1270 that manages the UE. The PLMN management unit 1210, the USIM management unit 1250, and the UE information management unit 1270 may be configured as separate physical entities, and may be configured as one entity, It is possible.

The service support confirmation unit 1200 checks whether the EPS service is supported based on the rejection reason and the reason for rejection in the received response (rejection) message, and controls the cell selection of the terminal.

For example, the PLMN management unit 1210 of the service support confirmation unit 1200 confirms that the rejection reason is '# 7 EPS service is not allowed', and selectively deletes the PLMN ID including the E-UTRAN from the PLMN list . The PLMN management unit 1210 may update the PLMN list in the form of Table 3 or Table 4. [ Therefore, in order to prevent Inter-RAT reselection with E-UTRAN supporting EPS service, it is possible to delete or partially delete all of the maintained equivalent PLMN lists. In addition, the PLMNs in the Equivalent PLMN list are lists of PLMNs considered to have the same priority as the PLMN currently selected in the PLMN (re-selection). Therefore, the fact that the UE does not exist in the Equivalent PLMN list means that it is impossible to select a cell (re-selection) between the currently selected PLMN and its corresponding PLMN, and thus the cell (re-) selection and IRAT can do.

On the other hand, the USIM management unit 1024 checks the validity of the USIM according to the service domain by referring to the rejection reason of the rejection message. For example, by checking USIM_VALID_FOR_CS_ONLY and # 7 EPS service not allowed, it is confirmed that the invalidated USIM can not be EPS service but non-EPS service is possible. Therefore, when performing PLMN selection, cell reselection is performed with a valid UTRAN / GERAN, except for E-UTRAN which is an invalid RAT. That is, the USIM management unit 1024 maintains / updates the validity of USIMs for each service domain, and when the PLMN selection is performed by the cell reselecting unit 1300, the PLMNs existing in the E-UTRAN Prevent selection and allow the service to perform reselection with a valid IRAT that is supported.

Also, the PLMN list management unit 1210 and the USIM validity management unit 1250 transmit updated service information in each entity to the UE information management unit 1270. The UE information management unit 1270 uses the updated service support information as the capability information of the updated terminal when exchanging information for wireless connection between the terminal and the upper network. Accordingly, it is possible to update whether the EPS service is supported by referring to the PLMN list, or to update whether the EPS service is supported based on the USIM validity information.

The cell reselecting unit 1300 refers to the updated PLMN list of the PLMN list management unit 1210 or checks USIM information for each updated service domain of the USIM validity management unit 1250, And performs wireless connection to the serviceable network by referring to the service support information of the terminal of the terminal 1270. Thereby preventing unnecessary cell reselection to the network.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

Claims (15)

A method for performing multiple wireless connections of a terminal in a wireless communication system,
Transmitting a registration message requesting a packet or non-packet service to a mobility management entity (MME)
Receiving, from the MME, a registration rejection message indicating that packet service is not allowed in a network wirelessly connected to the terminal;
Updating the list by deleting at least one or more networks supporting the packet service from a list including identification information (PLMN) of wireless access networks supported by the terminal,
And performing cell reselection with reference to the updated list.
The method of claim 1, wherein updating the list comprises:
And deleting a PLMN ID including a first network supporting the packet service, or selectively deleting a PLMN ID including a second network supporting the first network and non-packet service, from the list The method comprising the steps of:
2. The method of claim 1, wherein the step of performing the cell reselection comprises:
Further comprising the step of not transmitting a request message for a cell reselection procedure to a first network supporting the packet service according to the updated list.
2. The method of claim 1, wherein the step of performing the cell reselection comprises:
And supporting a non-packet service by performing a wireless connection to a second network supporting the non-packet service according to the updated list.
5. The method of claim 4, wherein the step of performing the cell reselection comprises:
Performing a measurement on at least one second network supporting the non-packet service, checking that there is no suitable cell for cell reselection as a result of the measurement, Further comprising the steps of: &lt; Desc / Clms Page number 12 &gt;
2. The method of claim 1, wherein the step of performing the cell reselection comprises:
And performing a wireless connection to the first network through an emergency service procedure to support the packet service.
2. The method of claim 1, wherein the step of performing the cell reselection comprises:
Further comprising the step of checking the validity of the packet or non-packet service of the Subscriber Identity Module (USIM) of the subscriber station.
8. The method of claim 7, wherein the step of performing the cell reselection comprises:
If it is confirmed that the USIM is invalid for the packet service as a result of checking the validity, performing a wireless connection to a second network supporting the non-packet service to support a non-packet service A method for performing multiple wireless connections.
A terminal apparatus for performing multiple wireless connections in a wireless communication system,
A transceiver for transmitting a registration message for requesting packet or non-packet service to a mobility management entity (MME), receiving a registration rejection message indicating that a packet service is not allowed in the network to which the terminal is wirelessly connected from the MME,
Receiving a registration rejection message transmitted from the transceiver, deleting at least one network supporting the packet service from a list including identification information (PLMN) of radio access networks supported by the terminal, And a USIM management unit for checking the validity of the packet or non-packet service of the Subscriber Identity Module (USIM) of the subscriber station,
And a cell reselecting unit for performing cell reselection under the control of the service support checking unit.
10. The apparatus of claim 9, wherein the PLMN manager comprises:
Deleting at least one PLMN ID including a first network supporting the packet service or selectively deleting at least one PLMN ID including a first network and a second network supporting non-packet service from the list And updating the list according to a result of the comparison.
10. The method according to claim 9,
And controls the cell reselecting unit not to transmit a request message for a cell reselection procedure to a first network supporting the packet service with reference to the updated list.
10. The method according to claim 9,
And controls the cell reselecting unit to perform wireless connection to a second network supporting the non-packet service by referring to the updated list.
13. The method according to claim 12,
Performing a measurement on a second network supporting the non-packet service, confirming that there is no suitable cell for cell reselection as a result of the measurement, And controlling the selection unit based on the received information.
13. The method according to claim 12,
Wherein the cell reselecting unit controls the cell reselecting unit to perform wireless connection to the first network through an emergency service procedure to support the packet service.
10. The method according to claim 9,
And controls the cell reselecting unit to perform wireless connection to a second network supporting the non-packet service by verifying that the USIM is invalid for the packet service as a result of checking the validity. Terminal device.

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