WO2014171699A1

WO2014171699A1 - Method for performing idle mode operation with particular communication system in network including multiple communication systems interworking with each other, and apparatus for same

Info

Publication number: WO2014171699A1
Application number: PCT/KR2014/003239
Authority: WO
Inventors: 이은종; 고현수; 최혜영; 한진백; 조희정; 정재훈
Original assignee: 엘지전자 주식회사
Priority date: 2013-04-15
Filing date: 2014-04-15
Publication date: 2014-10-23

Abstract

A method for performing an idle mode operation with a particular communication system by a terminal in a network including multiple communication systems interworking with each other according to the present invention comprises the steps of: transmitting, to an interworking entity of a first communication system, a result of scanning a base station of a second communication system in a state where the terminal is radio resource control (RRC)-connected with the first communication system and is in a deregistration mode with the second communication system; transmitting a first message from the interworking entity of the first communication system to the terminal, the first message including a first indicator instructing the terminal to perform an association process with the base station of the second communication system and a second indicator instructing the terminal to operate in a power saving mode with the second communication system; performing the association process with the base station of the second communication system on the basis of the first indicator of the first message; and entering the power saving mode from the deregistration mode with the second communication system on the basis of the second indicator of the first message.

Description

【Specification】

[Name of invention]

Method for performing idle mode operation with a specific communication system in a network interworking with a plurality of communication systems and apparatus therefor

Technical Field

The present invention relates to wireless communication, and more particularly, to a method for performing a specific ^I communication system and an idle mode operation and a device therefor in a network interworking with a plurality of communication systems.

Background Art

[002] In a wireless communication system, there may be two or more radio access technologies (RAAT) or a Multi-RAT terminal having a capability of accessing a communication system (capabi Hty). In order to access a specific RAT, a connection ion is set to a specific RAT based on a terminal request and data transmission and reception are performed. However, even though a multi-RAT terminal has a capability of accessing two or more RATs, the multi-RAT terminal cannot simultaneously access multiple RATs. That is, even if the current UE has a Multi-RAT capabi Hty, data transmission and reception are not possible at the same time through different RATs. .

Since the conventional multi-AT technology does not require interworking between the WLAN and the cellular network, overall system efficiency is low. In addition, even if the UE can simultaneously access the multiple RATs, simultaneous access to the multiple RATs is possible by supporting only the flow mobility / IP-flow mapping at the network level without control at the radio level. For this reason, the prior art did not require any control connection between the AP and the saller network, and has been progressed based on the request of the terminal.

However, such a conventional technology does not grasp the exact situation of the network, there is a limit to increase the overall network efficiency by selecting the terminal-oriented RAT. In particular, as a terminal becomes accessible to a plurality of communication systems, methods for efficiently converting data from one communication system to another communication system have been needed. However, such research has not been conducted. [Detailed Description of the Invention]

[Technical problem]

The technical problem to be achieved in the present invention is to provide a method for a terminal to perform an idle mode operation with a specific communication system in a network interworking a plurality of communication systems.

Another object of the present invention is to provide a terminal performing an idle mode operation with a specific communication system in a network in which a plurality of communication systems interoperate.

Technical problems to be achieved in the present invention to the above technical problem. Other technical problems which are not limited and not mentioned will be clearly understood by those skilled in the art from the following description.

Technical Solution

In order to achieve the above technical problem, a method in which a terminal performs an idle mode operation with a specific communication system in a network interworking with a plurality of communication systems, is connected to a Radio Resource Control (RC) with a first communication system Transmitting a scanning result of a base station of the second communication system to an interworking entity of the first communication system in a state of delegistration with the second communication system; A first indicator instructing the terminal to perform an association process with a base station of the second communication system from an interworking entity and a second indicator instructing the terminal to operate in a power saving mode with the second communication system _claim, including the step of transmitting the first message; wherein the second communication on the basis of the first indication of the first message, Performing an association process with a base station of the system, and entering the power saving mode from the disconnected mode with the C2 communication system based on the second indicator of the first message.

In the method, pre-association with the interworking entity of the first communication system and the terminal performs an association process with the base station of the second communication system and enters the power saving mode. Whether the procedure supports The method may further include negotiating. The first message is identifier information for the second communication system base station to perform an association process with the terminal, the terminal performs an association process with a base station of the second communication system and the power saving mode. The apparatus may further include at least one of information on a deadline time of a pre-association process and information on a listening interval with a base station of the second communication system. The base station of the second communication system may be a preferred base station of the terminal in the second communication system.

The method may further include starting a time limit timer of a pre-association process when the terminal receives the first message. The method may further include transmitting, by the terminal, a third indicator for notifying the base station of the second communication system to enter the power saving mode. The interworking entity of the first communication system may be one of an eNode B, a Mobility Management Entity ()), and an InterWorking Management Entity (I 觀 E). When there is no downlink data to be transmitted to the second communication system, the first message including the second indicator may be transmitted from an interworking entity of the first communication system.

The information on the listening interval may indicate that the power saving mode is switched to the power saving mode immediately after completing the association, and the terminal may receive a paging message from the first communication system.

[0012] The method may further include a second message including an indicator indicating that the procedure for entering the power saving mode and association with a base station of the second communication system is completed as an interworking entity of the first communication system. Transmitting; And receiving a voice response message for the second message from the interworking entity of the first communication system.

The method may further include notifying that a periodic broadcast signal of the second communication system is to be received from an interworking entity of the first communication system when there is downlink data to be transmitted through the second communication system. 2 receiving a fourth indicator indicating that there is downlink data to be transmitted through the communication system

3 step; And receiving a periodic broadcast signal of the second communication system based on the fourth indicator to switch to an awake state with the base station of the second communication system or receiving the fourth indicator of the second communication system. The method may further include operating in an awake state with the base station. The first communication system may be a cellular communication system and the second communication system may be a wireless LAN communication system.

In order to achieve the above technical problem, a terminal performing an idle mode operation with a specific communication system in a network interworking with a plurality of communication systems is connected with a first RRC (Radio Resource Control) with a first communication system. And transmits a scanning result for the base station of the second communication system to an interworking entity of the first communication system in a degistration mode with the second communication system, and interworks with the first communication system. A first indicator instructing the terminal to perform an association process with a base station of the second communication system from a working entity and a second indicator instructing the terminal to operate in a power saving mode with the second communication system A transmitter configured to transmit a first message comprising: and a phase based on the first indicator of the first message; And a processor configured to perform an association process with a base station of a second communication system and to enter the power saving mode from the disconnected mode with the second communication system based on the second indicator of the first message. have.

[015] The processor may pre-associate an interworking entity of the first communication system with the terminal to perform an association process with a base station of the second communication system and enter the power saving mode. You can control to negotiate whether or not a procedure is supported.

The terminal may further include a receiver configured to receive the first message from an Internet ¾ entity of the first communication system when there is no downlink data to be transmitted to the second communication system. The transmitter is configured to send a second message to the interworking entity of the first communication system including an indicator indicating that the procedure for entering the power saving mode and the association with the base station of the second communication system has been completed; The receiver answers the second message. And receive a message from the interworking entity of the first communication system.

[017] The receiver informs the reception of the periodic broadcast signal of the second communication system from the interworking entity of the first communication system when there is downlink data to be transmitted through the second communication system or the first communication signal. Receiving a fourth indicator indicating that there is downlink data to be transmitted through a second communication system, and the processor receives a periodic broadcast signal of the second communication system based on the fourth indicator to communicate with a base station of the second communication system; The controller may switch to an awake state or receive the fourth indicator to operate in an awake state with a base station of the second communication system.

Advantageous Effects

In order to efficiently use a secondary system (eg, WLAN / WiFi) by a mult i ᅳ RAT terminal in a broadband wireless communication system, it is proposed to minimize the operation of the secondary system idle mode of the terminal. It was. In particular, according to the technique of the present invention, in the case of a mult i-RAT terminal connected to WiFi in advance by the instruction of the cellular network, it is possible to use the minimum power according to the proposed new WiFi idle mode procedure.

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

[Brief Description of Drawings]

The accompanying drawings, which are included as a part of the detailed description to help understand the present invention, provide an embodiment of the present invention and together with the description, describe the technical idea of the present invention.

1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100;

2 is a diagram illustrating a network structure of an Evolved Universal Mobile Telecommunications System (E-UMTS).

3A shows a general structure of a general E-UTRAN and a general EPC It is a block diagram.

[024] FIG. 3B is a block diagram illustrating a user-plane protocol stack for an E—UMTS network.

3C is a block diagram illustrating a control plane protocol stack for an E—UMTS network.

4 is an exemplary diagram for explaining IP flow based WiFi mobility.

FIG. 5 is a diagram illustrating a network structure for explaining an interworking structure between a first communication system (ie, a cellular communication system) and a second communication system (wireless LAN communication system).

6 is a diagram illustrating a network structure of WiFi-Cellular interworking according to the present invention.

FIG. 7 is an exemplary diagram for describing a scenario of WiFi—cellular convergence network. FIG.

8 is a diagram illustrating Reassociat ion Procedures in an IEEE 802.11 WLAN system.

9 is a diagram illustrating a attach and Mult i -RAT capability negotiation process of the Muhi -RAT terminal ⁰ i.

FIG. 10 is an example for explaining a process of allowing an interworking entity to perform a WiFi connection (or association) of a Mult i-RAT terminal in advance (WiFi pre association procedure) and a new power saving mode of WiFi. Drawing.

11 is a diagram illustrating an example of a new WiFi pre—association procedure proposed by the present invention.

[Best form for implementation of the invention]

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art

6 It is understood that the present invention may be practiced without these specific details. For example, the following detailed description will be described in detail assuming that the mobile communication system is a 3GPP LTE, LTE-A system, except for the specific matters of 3GPP LTE, LTE ᅳ A other arbitrary mobile communication system Applicable ·

In some cases, well-known structures and devices may be omitted or shown in block diagram form centering on the core functions of the structures and devices in order to avoid obscuring the concepts of the present invention. In addition, the same components will be described with the same reference numerals throughout the present specification.

In addition, in the following description, it is assumed that a terminal collectively refers to a mobile or fixed user terminal device such as a UE Jser Equipment (MS), a Mobile Station (MS), an Advanced Mobile Station (AMS), etc. It is assumed that an arbitrary node of a network terminal that communicates with a terminal, such as an eNode B, a base station, and an access point (AP), is collectively assumed. Although described herein based on the IEEE 802.16 system, the contents of the present invention can be applied to various other communication systems.

In a mobile communication system, a user equipment (UE) may receive information from downlink (downlink) from a base station, and the terminal may also transmit information through uplink (UpHnk). Information transmitted or received by the terminal includes data and various control information, and various physical channels exist according to the type and purpose of the information transmitted or received by the terminal.

[038] The following techniques are code division multiple access (CDMA), frequency division multiple access (FDMA), time .division multiple access (TDMA), orthogonal frequency division multiple access (0FDMA), and single carrier frequency division multiple (SC-FDMA). It can be used in various wireless access systems such as access). CDMA may be implemented by a radio technology such as UTRAOJniversal Terrestrial Radio Access) or CDMA2000. TDMA may be implemented in a wireless technology such as Global System for Mobile Communication (GSM) / Gener a 1 Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). 0FDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTR Evolved UTRA. UTRA UMTS J versal Mobile It is part of Telecommunications System. The 3rd Generation Partnership Project (3GPP) LTEdong term evohi on (E-UMTS) using E JTRA and part of the 3GPP employ 0FDMA in downlink and SC—FDMA in uplink. LTE-A (Advanced) is an evolution of 3GPP LTE.

In addition, specific terms used in the following description are provided to help the understanding of the present invention, and the use of such specific terms may be modified in other forms without departing from the technical spirit of the present invention. .

1 is a block diagram illustrating the configuration of a base station 105 and a terminal 110 in a wireless communication system 100.

[041] Simplify wireless communication system 100. Although one base station 105 and one terminal (including 110KD2D terminal) are shown for illustration, the wireless communication system 100 may include one or more base stations and / or one or more terminals.

Referring to FIG. 1, the base station 105 includes a transmit (Tx) data processor 115, a symbol modulator 120, a transmitter 125, a transmit / receive antenna 130, a processor 180, a memory 185. And a receiver 190, a symbol demodulator 195, and a receive data processor 197. And, the terminal 110 transmits (Tx) data processor 165, symbol modulator 175, transmitter 175, transmit and receive antenna 135, processor 155, memory 160, receiver 140, symbol Demodulator 155 and receive data processor 150. Although the transmit and receive antennas 130 and 135 are shown as one at the base station 105 and the terminal 110, respectively, the base station 105 and the terminal 110 are provided with a plurality of transmit and receive antennas. Accordingly, the base station 105 and the terminal 110 according to the present invention support the MIMXMu ™ tiple Input Multiple Output (System) system. In addition, the base station 105 according to the present invention may support both the SU-MIM0 (Single User-MIMO) MU-MIM0 (Mul t User-MIMO) scheme.

On the downlink, the transmit data processor 115 receives the traffic data, formats the received traffic data, codes it, interleaves and modulates (or symbol maps) the coded traffic data, and modulates symbols. ("Data symbols"). The symbol modulator 120 receives and processes these data symbols and pilot symbols to provide a stream of symbols.

[044] The symbol modulator 120 multiplexes the data and pilot symbols and sends it to the transmitter.

8 Send to 125. In this case, each transmission symbol may be a data symbol, a pilot symbol, or a signal value of zero. In each symbol period, pilot symbols may be sent continuously. The pilot symbols may be frequency division multiplexed (FDM), orthogonal frequency division multiplexed (OFDM), time division multiplexed (TDM), or code division multiplexed (CDM) symbols.

Transmitter 125 receives the stream of symbols and converts it into one or more analog signals, and further adjusts (eg, amplifies, filters, and upconverts) these analog signals. Also, a downlink signal suitable for transmission over a wireless channel is generated, and then, the transmit antenna 130 transmits the generated downlink signal to the terminal.

In the configuration of the terminal 110, the receiving antenna 135 receives the downlink signal from the base station and provides the received signal to the receiver 140. Receiver 140 adjusts the received signal (eg, filtering, amplifying, and frequency downconverting), and digitizes the adjusted signal to obtain samples. The symbol demodulator 145 demodulates the received pilot symbols and provides them to the processor 155 for channel estimation.

[047] The symbol demodulator 145 also receives a frequency equal answer estimate for the downlink from the processor 155, performs data demodulation on the received data symbols, and performs the data (which are estimates of the transmitted data symbols). Obtain symbol estimates and provide data symbol estimates to receive (Rx) data processor 150. Receive data processor 150 demodulates (ie, symbol de-maps), deinterleaves, and decodes the data symbol estimates to recover the transmitted traffic data.

The processing by symbol demodulator 145 and receive data processor 150 are complementary to the processing by symbol modulator 120 and transmit data processor 115 at base station 105, respectively.

The terminal 110 is on the uplink, the transmit data processor 165 processes the traffic data to provide data symbols. The symbol modulator 170 may receive and multiplex data symbols, perform modulation, and provide a stream of symbols to the transmitter 175. Transmitter 175 receives and streams of symbols

9 Processing to generate an uplink signal. The transmit antenna 135 transmits the generated uplink signal to the base station 105.

In the base station 105, an uplink signal is received from the terminal 110 through the receiving antenna 130, and the receiver 190 processes the received uplink signal to obtain samples. The symbol demodulator 195 then processes these samples to provide the received pilot symbols and data symbol estimates for the uplink. The received data processor 197 processes the data symbol estimates to recover the traffic data sent from the terminal 110.

Processors 155 and 180 of the terminal 110 and the base station 105 respectively instruct (eg, control, coordination, management, etc.) operation at the terminal 110 and the base station 105, respectively. . Respective processors 155 and 180 may be connected with memory units 160 and 185 that store program codes and data. The memory 160, 185 is coupled to the processor 180 to store the operating system, the application, and the genera files.

The processors 155 and 180 may also be referred to as controllers, microcontrollers' microprocessors, microcomputers, or the like. Meanwhile, the processors 155 and 180 may be implemented by hardware or firmware, software, or a combination thereof. When implementing an embodiment of the present invention using hardware, ASICsUppHcation specific integrated circuits (DSICs), digital signal processors (DSPs), DSPDs (digital signal processing devices), programmable logic devices (PLDs), FPGAs (field) progr mmable gate arrays and the like may be provided in the processors 155 and 180.

On the other hand, when implementing embodiments of the present invention using firmware or software, firmware or software may be configured to include a module, procedure, or function that performs the functions or operations of the present invention. Firmware or software configured to perform the above may be provided in the processors 155 and 180 or stored in the memory 160 and 185 to be driven by the processor 155 and 180.

[054] The layers of the air interface protocol between a terminal and a base station in a wireless communication system (network) are well known OSKopen system in a communication system.

10 can be classified into a first layer (L1), a second layer (L2), and a third layer (L3) based on the lower three layers of the interconnection model. The physical layer belongs to the first layer and provides an information transmission service through a physical channel. A Radio Resource Control (RRC) layer belongs to the third layer and provides control radio resources between the UE and the network. The terminal and the base station may exchange RRC messages through the wireless communication network and the RRC layer.

In the present specification, the processor 155 of the terminal and the processor 180 of the base station process signals and data except for a function of receiving or transmitting a signal and a storage function of the terminal 110 and the base station 105, respectively. For the convenience of description, the processor 155 and 180 will not be specifically described below. Although not specifically mentioned by the processors 155 and 180, it may be said that a series of operations such as a function of receiving or transmitting a signal and a data processing other than a storage function are performed.

FIG. 2 is a diagram illustrating a network structure of an Evolved Universal Mobile Telecommunications System (E-UMTS). E—UMTS may be called as LTE system. The system may be widely deployed to provide various communication services, such as voice ALV packet data, and is generally configured to function based on various techniques to be described and described in detail with reference to the following figures.

2, the E-UMTS network includes an Evolved UMTS terrestrial radio access network (E-UTRAN), an Evolved Packet Core (EPC), and one or more terminals 10. The E-UTRAN includes one or more base stations 20. In connection with the EPC, 讓 E / SAE gateway 30 provides the terminal 10 with endpoint and mobility management functions of the session. The base station 20 and the E / SAE gateway may be connected via an S1 interface.

Terminal 10 is a device carried by a user and may also be referred to as a mobile station (MS), user ^' terminal (UT), subscriber station (SS) or wireless device.

Base station 20 is generally a fixed station that communicates with terminal 10. In addition to being called a base station, a base station may be called an access point (AP). Base station user to terminal

11 Provide end points of the user plane and the control plane. In general, a base station includes a transmitter and a processor, among other components, and is configured to operate in accordance with the various techniques described herein. .

A plurality of terminals 10 may be located in one cell. One base station 20 is generally arranged per cell. An interface for transmitting user traffic or control traffic may be used between the base stations 20. In this specification, "downlink ¹ " indicates communication from the base station 20 to the terminal 10, and "uplink" indicates communication from the terminal to the base station.

廳 E / SAE gateway 30 is a cipher of distribution of paging messages, security control, idle mobility control, SAR bearer control and non-access stratum (NAS) signaling to base stations 20 ing) and integrity (integrity protection). The SAE gateway 30 provides various functions including termination of U ^ plan packets for paging reasons, switching of the Q-plan to support terminal mobility. For convenience of description, the 薩 E / SAE gateway 30 may be referred to herein simply as a “gateway”. However, it can be understood that such a structure may include both a VE gateway and a SAE gateway.

[062] A plurality of nodes may be connected between the base station 20 and the gateway 30 via the S1 interface. The base stations 20 may be connected to each other via a χ2 interface, and neighboring base stations may have a meshed network structure with a χ2 interface.

3A is a block diagram showing a general structure of a general E—UTRAN and a general EPC. Referring to Figure 2a, the base station is selected for the gateway 30, routing to the gateway when Radio Resource Control (RRC) active, scheduling and transmission of paging messages, scheduling and transmission of broadcast channel (BCCH) information downlink And dynamic allocation of resources to the terminals 10 in uplink, configuration and provisioning of base station measurements, radio bearer control, radio permission control (RAC), and connection mobility management functions in the LTE_ACTIVE state. can do.

12 In the EPC, as described above, the gateway 30 is responsible for paging initiation, LTE_IDLE state management, user plane calculation, SAE bearer management, and non-access stratum (NAS) signaling. It can perform the functions of integrity protect ion.

3B and 3C are block diagrams illustrating a user-plane protocol and control plane protocol stack for an E—UMTS network. 3B and 3C, the protocol layers are divided into a first layer (L1), a second layer (L2), and a third layer (L3) based on three lower layers of the open system interconnect (0SI) standard model. Can be divided.

The first layer (L1) (or physical layer (PHY)) provides the information transmission service to the upper layer using a physical channel. The physical layer is connected to a MAC layer located at a higher level through a transport channel, and data between the MAC layer and the physical layer is transmitted through a transport channel. Data is transmitted over the physical channel 21 between different physical layers, i.e., between the physical layers of the transmitting side and the receiving side (for example, between the physical layers of the terminal 10 and the base station 20).

The MAC layer of Layer 2 (L2) provides a service to the RLC layer, which is a higher layer, through the logical channel. The MAC layer of Layer 2 (L2) supports reliable data transmission. The RLC layer shown in FIGS. 3B and 3C is shown that if the MAC RLC functions are implemented and performed in the MAC layer, the RLC layer itself is not needed. Referring to FIG. 3B, the PDCP layer of Layer 2 employs Internet Protocol (IP) packets, such as IPv4 or IPv6, which can be efficiently transmitted over a wireless interface with relatively small bandwidth, thereby providing unnecessary control information to the transmitted data. Header compression is performed to reduce.

Referring to FIG. 3C, the RRC layer located at the lowest part of the third layer (L3) is defined only in the control plane and configures, reconstructs, and carries radio channels (RBs) of logical channels, transport channels, and physical channels. Control in the release relationship. Here, the radio bearers refer to a service provided to the second layer (L2) for data transmission between the terminal (terminal) and the E-UTRAN.

Referring to FIG. 3B, the RLC and MAC layers (terminated at base station 20 on the network side) are scheduled, ARC Autoinatic Repeat reQuest),

13 Performs functions such as Hybrid Automatic Repeat reQuest (HARQ). The PDCP layer (terminated at base station 102 on the network side) may perform user plane functions such as header compression, integrity protection, and ciphering.

Referring to FIG. 3C, the RLC and MAC layers (terminated at base station 20 on the network side) perform the same functions as the control plane. As illustrated, the RRC layer (terminated at base station 20 on the network side) may perform functions such as broadcast, paging, RRC connection management, radio bearer (RB) control, mobility functions, and terminal measurement reporting and control. Can be. The NAS control protocol terminated at the 画 E gateway 30 on the network side may perform functions such as SAE bearer management, authentication, LTE_IDLE mobility handling, paging start in LTEJDLE, and security control for signaling between the gateways and the terminal 10. Can be.

[071] The NAS control protocol may use three different states: first if there is no RRC entity, LTE_DETACHED state, second if there is no RRC connection but the minimum terminal information is stored. LTE 一 IDLE state. Third, RRC connection is established, LTE_ACTIVE state.

In addition, the RRC state may be divided into two different states, such as RRCJDLE and RRC—CONNECTED. In the RRC—IDLE state, the terminal 10 may receive a broadcast of paging information and system information while the terminal 10 specifies a discontinuous reception (DRX) configured by the NAS, and the terminal 10 Is assigned an identifier (ID) for uniquely identifying the terminal in the tracking area. In addition, in the RRC_IDLE state, there is no RRC context stored in the base station 20.

In the RRC_IDLE state, the UE 10 specifies a paging DRX cycle. In particular, the terminal 10 monitors a paging signal in a specific paging case of every terminal specific paging DRX cycle.

In the RRC_C0NNECTED state, the terminal 10 has an E—UTRAN R C connection and context in the E ᅳ UTRAN to transmit and / or receive data from / to a network (base station) that is enabled. In addition, the terminal 10 receives the channel quality information and the feedback information.

14 Report to base station 20.

RRC—In the CONNECTED state, the E-UTRAN knows the cell to which the terminal 10 belongs. Thus, the network can transmit and / or receive data to / from the terminal 10, the network can control the mobility (handover) of the terminal 10, and the network performs cell measurements for neighboring cells. can do.

4 is an exemplary diagram for explaining IP flow based WiFi mobility.

IFOM (IP Flow Mobility): 3GPP (Rel-10) standard describes 3G / WiFi Seamless Off load, WLAN offloading technology of DSMIPv6 based IP Flow unit, DSMIPv6 (Dual Stack Mobile IPv6) terminal and network It provides a solution that supports IPv4 and IPv6 simultaneously. As the adoption of IPv6 has expanded due to the diversification of mobile communication networks, and mobility support has emerged as a core technology, even existing IPv4 networks require DSMIPv6 because mobility support is required. In addition, the client-based device detects its movement and informs the agent. Provide MIP technology. HA is an agent that manages mobility of mobile node, and there exists Flow Binding Table and Binding Cache table. In case of using PMIPv6, IF0M uses only DSMIFV6 because of technical problem that IP flow unit is difficult to manage.

MAPC0N (Multi Access PDN Connectivity): Simultaneous multiple PDN connectivity to different APNs, and can be used as a protocol independent technology, PMIFV6, GTP, DSMIPv6. All data flows that were being transmitted through one PDN are moved. ^'

[079] A network structure in which a plurality of communication systems interwork or interwork is described.

FIG. 5 is a diagram illustrating a network structure for explaining an interworking structure between a first communication system (ie, a seller communication system) and a second communication system (wireless LAN communication system).

In the present invention, an LTE system, which is one of the cellular communication systems corresponding to the first communication system, and a WiFi system, which is one of the WLAN communication systems corresponding to the second communication system, will be described as an example.

In the network structure ^ shown in FIG. 5, a backbone network (eg, P ᅳ

15 Alternatively, there may be a backhaul control connection between the AP and the eNB through an Evolved Packet Core (EPC), or there may be a wireless control connection between the AP and the eNB. For peak throughput and data traffic of f-loading, a first communication system (or first communication) using a first wireless communication scheme through interworking between a plurality of communication networks Network) and a second communication system (black or second communication network) using a second wireless communication method can be simultaneously supported. Herein, the first communication network or the first communication system is referred to as a primary network or a primary system, respectively, and the second communication network or the second communication system is referred to as a secondary network or a secondary system, respectively. (Secondary system) can be called. For example, the UE may be configured to simultaneously support LTE (or LTE ᅳ A) and WiFi (local area communication systems such as WLAN / 802.11). Such a terminal (UE) may be referred to herein as a multi-system capability UE.

[083] Fig. In the network structure shown in FIG. 5, the primary system has wider coverage and may be a network for transmitting control information. An example of a primary system may be a WiMAX or LTE (LTE-A) system. Meanwhile, the secondary system is a network having a small coverage and may be a system for data transmission. The secondary network may be, for example, a WLAN system such as WLAN or WiFi.

In the present invention, the following matters are assumed.

The entity that manages interworking assumes that the cell is an entity in the network and assumes that interworking functions are implemented in the following three entities.

[086] e-NB -reuse existing entity

Mobility Management Entity (MME)-Reuse existing entity

[088] Ivor E (Intervorking Management Entity)-define new entity

[089] Interworking function is interworking that can occur between eNB—UE or eNB-AP.

16 Related to the related procedure, the entity managing interworking stores / manages AP information. The eNB / 醒 E / IWME stores / manages information of APs under its coverage.

[090] An AP that is an access point of a secondary system (eg, WiFi) and a base station (eNB) that is an access point of a primary system (eg, a cellular communication system such as an LTE system or a WiMAX system) are connected to each other wirelessly. Assume that a connection is established on the phase. In the present invention, an AP having a radio interface with an eNB is also called an eAP. In other words, the eAP should support not only 802.11 MAC / PHY, but also LTE protocol stack or WiMAX protocol stack for communication with the eNB, and act as a terminal with the eNB and can communicate with the eNB.

6 is a diagram illustrating a network structure of WiFi-Cel hilar interworking according to the present invention.

The technology of the present invention allows a dual mode or multi-RAT terminal to use a WiFi-ceiluIar convergence network more efficiently in an environment where a terminal capable of simultaneously transmitting and receiving WiFi and cellular networks exists. The network can manage the AP's information in the following four ways.

[093] Method 1. Use of air interface between eNB and AP

The eNB means controlling the AP similarly to a general UE using a wireless control connection with the AP.

Method 2. Using the backhaul interface between the eNB and the AP

[096] eNB means controlling the AP using a radio control connection with the AP.

Method 3. Using a control interface between the MME and the AP

098 means controlling the AP using a control connection between E and an AP (ie, a secondary system).

[099] Method 4. Using the Control Interface between I \ E and AP

I 麵 E means to control the AP by using a control connection between the AP (that is, secondary system).

7 is an exemplary diagram for explaining a scenario of a WiFi-Cel lular converged network.

17 The scenario ① of FIG. 7 is a cell-only access scenario of a terminal, and for the automatic WiFi switching / simultaneous transmission in a state in which the terminal is connected only to a cell network, a definition of a prior technology is necessary. AP information management for interworking is performed at the network level (cellular-WiFi), and WiFi discovery and WiFi network access are performed at the device level (cellular-device-WiFi). ② -1 to ②— 3 respectively indicate the WiFi automatic switching of the user plane (U-Plane), the WiFi automatic switching of the flow, the WiFi automatic switching of the bearer, and the WiFi automatic switching of data. As a result, when the mobile is automatically switched to the WiFi-WiFi U ᅳ plane, all data is transmitted only to WiFi. ②— 2, ② ᅳ 3 According to the scenario, when the cell-Wireless U-plane is switched to be transmitted at the same time, data can be simultaneously transmitted to the WiFi and the seller-network using the bandwidth segregation or aggregation technique. Here, bandwidth segregation is automatic switching for each flow (service / IP flow), such as ② -2, and different flows are transmitted through different RATs. In 2), flow-by-flow automatic switching can be one or more service / IP flow (s). That is, the conversion may be a flow unit (② -2-1) or a data radio (or EPS) bearer switching (② -2-2). Bandwidth aggregation enables transmission through different RATs in data units even with the same flow as in ② ᅳ 3.

② After WiFi automatic switching is performed as in the scenario ③, the cellular link control is possible based on WiFi as in the scenario. Control of paging or radio link failure (RLF) associated with a cell link can be received through a WiFi link.

Hereinafter, a description will be given of the connection procedure (Connect ion Procedures of IEEE 802.11 WLAN) in the IEEE 802.11 WLAN system.

In the connection procedure, the scanning step is divided into passive scanning and active scanning, and the terminal (for example, the STA) searches for the neighbor AP in the scanning step to store information and receives the beacon frame of the neighbor AP. And transmit and receive probes and probe response frames. The next step is a join step.

Select APs from the AP list, synchronize them, and collect information about them. Then, a beacon frame of the selected AP is received. Next, as an authentication step, the terminal is authenticated. Open system authentication process

18 In the authentication request of the terminal, the AP performs authentication unconditionally, and the shared key authentication procedure performs authentication by checking the shared secret key. Send and receive an authentication frame. Next, in the Association step, the UE is assigned an Association IDUdentif ier) through an Association Response frame, and transmits and receives an Association Request and Response frame.

Reassociat ion occurs when a terminal (STA) moves to another AP coverage. The terminal transmits the information about the MAC address of the current AP to the New AP through the reassociation request frame. Thereafter, IAP (Inter 一 AP Protocol) messages are exchanged between the New AP and the Old AP. The new AP requests the IAPP to relay the information of the old AP, and the old AP deletes the AKKAssociation Id) of the terminal. IAPP (Inter-AP Protocol) 802.1Π is a protocol for exchanging context between APs through a DS in a WLAN system. The AP caches the exchanged PMK information and uses an identifier (keylD) of a key used by the terminal in the old AP. When reassociation request is made, the AP skips the authentication process using the cached PMK and performs key exchange.

[0108] The Disassociation Procedures of IEEE 802.11 WLAN will be briefly described. Disassociation is a notification, not a request. The AP needs to disassociate the STAs to enable the AP to be removed from the network for service or for other reasons. When the STAs leave the network, the STAs attempt to disassociate. The disassociation frame is transmitted, which contains a reason code.

[0109] Scanning / join related frames in an IEEE 802.11 WLAN system will be described.

Beacon frame (Beacon frame): The transmission may be delayed if the channel is busy at the time to be transmitted periodically but only in the AP. The frame control includes Duration, DA, SA, BSSID, Fragment number, Sequence information, and the frame body includes Time stamp, beacon interval, capability information, {SSID, Supported rates, DS parameter Set, TIM} IEs. TIM is Traffic Indication MAP, Doze It is used as an indication (indicat ion as AID) to wake up the terminal in mode.

[0111] Probe request frame: used in active scanning. Frame contrc) l includes Duration = 0x0000, DA = broadcast, SA, BSSID = any AP, Fragment number, Sequence. The frame body contains {SSID, Supported Rates} IEs.

[0112] Probe response frame: A probe response is sent to the probe. Frame control includes Duration, DA, SA, BSSID, fragment number, Sequence, and frame body includes Time stamp, beacon interval, capability information, {SSID, supported rate, DS parameter Set} IEs.

[0113] Association related frames in an IEEE 802.11 WLAN system will be described.

[0114] Authentication frame (Authentication frame): used in authentication request and response, and is divided into Authentication transaction Sequence because the format is the same. Frame control includes Duration, DA, SA, BSSID, Fragment number, Sequence, and Frame body contains Authentication Algorithm Number, Status code, challenge text IE. Authentication Algorithm Number ： Open System, Shared Key, Fast BSS Transition

Association request frame: includes a listen interval that specifies how long to stay in power saving mode when requesting association. Frame control includes Duration, DA, SA, BSSID, Fragment number, Sequence, and frame body contains Capability information, Listen Interval, {SSID, Supported Rates} IEs.

Association response frame: transmitted in response to an association request and assigned an AID value. Frame control includes Duration, DA, SA, BSSID, fragment number, Sequence, and frame body contains Capability information, Status Code, Association ID, Supported rates IE.

[0117] Re / Disassociation related frames in IEEE 802.11 WLAN will be described.

Reassociat ion request frame: includes a listen interval that specifies the length of time to stay in the power saving mode in the reassociation request. Frame control includes Duration, DA, SA, BSSID, Fragment number, Sequence, Frame body is Capability Information, Listen Interval, Current AP address, {SSID, Supported Rates} IES.

[0119] Reassociation response frame: Association response ^{■ The} same frame as the frame is used and an AID value to be used in the new AP is allocated. Frame control contains Duration DA, SA, BSSID, fragment number, Sequence, and frame body includes Capability information, Status Code, Association ID, and Supported rates IE. In Di sassoc i at i on / Deaut hent i cat i on frame, the Fr me control includes Duration, DA, SA, SSID IE, fragment number, Sequence, and frame body contains Reason Code.

[0120] The power saving mode in the IEEE 802.11 system will be described.

Doze mode: Farway of the terminal; In order to save power, this mode stops the transceiver for a certain time when it does not transmit or there is no data to be transmitted to it.

[0122] The transition method from the awake mode to the Doze mode transitions to the Doze state by specifying a Listen interval of an initial 'association request frame. Or, if necessary, transmit a null data frame set to PM = 1. After receiving the ACK for this, it may enter the doze mode. In the doze mode, the traffic indication control information (eg, Traffic Indication MAP IE message) is checked, and the signal wakes up around the time when the beacon frame is transmitted to confirm the beacon frame.

In the transition method from the Doze mode to the Awake mode, when the bit corresponding to its AID is set to 1 in the TIM, the UE wakes up and transmits its AID in the duration region of the PS-Poll message. Receiving the PS-Poll frame, the AP delivers buffering data to the terminal. If more than one buffered frame is set, the data bit may be set to 1 to inform the UE that there are more frames.

[0124] The description of the IEEE 802.11 WLAN described above may be applied in the context of the present invention. The conventional inter RAT technology is designed based on a request of a terminal, does not require interworking between the WLAN and the cell network, and a specific network server manages the WLAN information. Enable inter RAT handover. In addition, the terminal can be connected to multiple RATs simultaneously.

21 Even if possible, it supports simultaneous access to multiple RATs by supporting only flow mobility / IP-flow snapping at the control network level at the radio level. For this reason, the prior art does not require any control connection between the AP and the cellular network, and enables connection to the multiple RAT based on the request of the UE. Such a prior art does not accurately grasp the situation of the network, there is a limit to increase the overall network efficiency by selecting the terminal-oriented RAT.

In order to improve the overall network efficiency as well as improve the QoS of the terminal through the use of Mult i-RAT, it is necessary to provide a network-based tightly-coupled MultiRAT management technology rather than the terminal request base. This requires more efficient and faster inter-RAT interworking by setting up direct control connection between different RATs at the network level. You should be able to transfer it. Before the Multi RAT terminal accesses two different RATs simultaneously, the network may help the terminal select an optimal RAT or AP, and for this purpose, the network may request information of a secondary system such as WiFi from the terminal. In the present invention, a terminal that simultaneously accesses two different RATs is called a Mu i-RAT terminal.

9 is a diagram illustrating an attach and multi-RAT capability negotiation process of a Multi—RAT terminal.

Referring to FIG. 9, a Multi—RAT UE (Multi—RAT UE) performs an attach process with an eNB, a UE E, and an IWE of a cellular network (attach request, attach accept, etc.). After completing the attach process, the Multi-RAT terminal may generate a UL / DL data tunnel (EPS bearers-default EPS bearers).

[0128] The Multi-RT RAT terminal may then perform a MULTI-RAT capability negotiation process with the cellular network (eg, IWE). That is, IWE is sent to the terminal Multi- RAT MULTI ^¬ RAT capability request request message, In response, the Multi-RAT Multi RAT mobile station sends a capability response message including the preferred AP list. After that, the IWE transmits a Multi-RAT capability complete message to the UE.

22 Complete the MT capability negotiation process. The preferred AP list may be transmitted in advance in the initial connection with the IWE (eg, WiFi capability negotiation during or after connect ion (re) estabnshment) as one of the WiFi-related capabilities of the UE.

[0129] The Multi-RAT terminal may scan the APs and transmit information on the detected AP list (or Preferred AP list among the detected AP list) to the IWE. The information on the Preferred AP may be AP ID such as SSHKService Set IDentif ier / Basic Service Set IDentif ier (BSSID) for AP that Multi-RAT terminal frequently accesses or stays for a long time. It may be an SSID / BSSID of a public AP or an SSID / BSSID of a private AP. The IWE may determine the WiFi network access based on the preferred AP list received from the MLII RAT terminal. As such, FIG. 9 illustrates a WiFi capability negotiation process and a decision of accessing a Preferred AP based WiFi network.

As described above, although the Multi-RAT terminal has completed the connection to the WiFi in advance, it is proposed to instruct to switch to the WiFi power saving mode while instructing the pre-association in order to minimize the terminal battery consumption. In the case of the pre association, it is preferably performed when a preferred AP (Preferred AP) of the Multi-RAT terminal is detected.

[0131] In the present invention, when the network supports the cellular-WiFi convergence technology, the WiFi pre-associat ion of the Multi-RAT terminal is indicated, and at this time, a new WiFi idle for minimizing the power of the Multi-RAT terminal. We will suggest a mod procedure. Hereinafter, the newly proposed WiFi pre-associat ion and the new power saving mode of WiFi will be described.

10 is a process for allowing an interworking entity (eg, eNB, 應 E, new entity in cellular network) to perform Wi-Fi connection of a UE in advance (WiFi pre association procedure) and new power saving of Wi-Fi. It is an exemplary diagram for explaining the mode. ^'

As shown in FIG. 10, the Multi-RAT terminal is connected with the cell network.

RRC_Connected status and WiFi network and WiFi-Deregistrat ion status (ie WiFi

23 In the case of being deregistered from the network and operating in the disconnected mode, the beacon signal, which is a signal that is periodically broadcasted, may be received from at least one AP. The Mult i-RAT terminal may perform WiFi scanning to detect an AP and transmit a WiFi scanning result to a cellular network (eg, IWE). Then, when the saller network (for example, IWE) decides to perform Wi-Fi connection of the multi-RAT terminal in advance (for example, it is determined by the detection of a preferred AP), the preferred AP to the multi-RAT terminal A WiFi pre-attach request message indicating a WiFi pre-attach to the network can be transmitted.

In addition, since the cellarer network knows that there is no downlink data to be transmitted to WiFi to the Multi-RAT terminal, when there is no downlink data to be transmitted to WiFi to the Multi-RAT terminal, the WiFi pre-attach request message is provided. Multi—In order to minimize the power of the RAT terminal, the WiFi pre-attach may be instructed, and upon completion of the pre-attach, the Multi-RAT terminal may instruct to enter the WiFi power saving mode. In the present invention, such a process is referred to as WiFi pre-associat ion of the Multi-RAT terminal.

In addition, the IWE of the cellular network instructs to enter the WiFi power saving mode of the Multi-RAT terminal, and when the terminal enters the WiFi power saving mode by such an instruction, a listening interval (listening interval) is different from the conventional method. We propose a procedure to perform power saving mode without). Multi— The RAT terminal may transmit an indicator (PM = 1) indicating that the AP intends to enter a WiFi power saving mode.

[0136] After entering the WiFi power saving mode, the Multi-RAT terminal may transmit a WiFi pre—attach complete message indicating the completion of the WiFi pre-attach to the IWE. Then, the IWE may recognize that the Multi-RAT terminal is WiFi attached but has entered the WiFi power saving mode. In response to the WiFi pre-attach complete message, the IWE may send an AC message (eg, a WiFi pre-attach complete ACK message) to the Multi-RAT terminal.

Next, referring to FIG. 11, the case of instructing the switch to the WiFi power saving mode while instructing the pre-associat ion will be described in more detail. FIG.

24 11 is a diagram illustrating an example of a new WiFi pre-association procedure proposed by the present invention.

Referring to FIG. 11, a Mul — RAT terminal may perform a MULTI-RAT capability negotiation process with a cellar network (eg, IWE). In the Mult i -RAT UE capability neat iat ion for pre-associat ion, the capability of pre-association can be set during the process by which the multi-RAT UE neut iat ionizes the IWE and its MultiRAT related capability. . That is, when the Multi-RAT terminal sends a MULT I -RAT capability negotiation request message to the IWE, the IWE sends a Multi-RAT capability negotiation response message to the Multi-RAT terminal in response. If a pre-association proposed in the technique of the present invention is defined, it is preferable to exchange in advance between the Multi-RAT terminal and the IWE whether the procedure can be performed. When both the Multi-RAT terminal and the Cellular network are transmitted and received, and both support pre-association, a pre-association related procedure may be performed.

[0140] The following parameters should be defined in a message related to Multi AT Capability Negotiation.

[0141] WiFi Pre-Association support (1 bit) should be defined, for example, if a 1-bit value of 0 indicates that pre-association cannot be performed, and if 1 indicates that pre-association can be performed. It is. In addition, the Multi-RAT terminal and the IWE may transmit information including a preferred AP in a MultiRAT Capability Negotiation related message. The multi-RAT terminal may inform that the pre-association is supported by transmitting by setting the WiFi pre-associat ion support (1 bit) to 1 in the multi-RAT capability negotiation request message.

Subsequently, Mult i— The RAT terminal may receive a beacon signal, which is a signal that is periodically broadcasted from at least one AP, and perform WiFi scanning to perform a WiFi scanning result with a cellular network (eg, IWE). Can transmit Then, when the cellular network (for example, IWE) decides to perform the WiFi connection of the terminal in advance ((pre-attach to WiFi)), the WiFi indicating the WiFi pre-attach to the preferred AP to the multi-RAT terminal A pre-attach request message can be sent. fiFi pre-

25 The attach request message may include the following parameters.

1) BSSID / SSID for Pre association AP

2) indicator indicating to enter the WiFi Power Saving mode

3) Information on the WiFi Listening interval section

4) Pre 一 associat ion deadline timer

Pre01 associat ion deadline timer may be set to a time value thereafter in consideration of the time required for the Multi-RAT terminal to complete the switching between the AP and the associat ion and power saving mode. Upon receiving the WiFi pre-attach request message, the Multi-RAT terminal performs pre-associat ion to the AP for the corresponding BSSID / SSID. And, when receiving the WiFi pre-attach request message, the Multi-RAT terminal is a pre-associat ion deadline timerline Λ] 2] -Λ ¾υ.

[0148] The Multi-RAT terminal receiving the WiFi pre-attach request message is an Association.

It establishes the connection with the AP transmitted from the IWE through the REQ / RSP message.

[0149] If the Multi-RAT terminal receives a WiFi pre-attach request message with a WiFi Listening interval set, the listening interval of the Association request message may be set during the association process with the AP with reference to the corresponding WiFi listening interval value. If the WiFi listening interval is set to "0" or a reserved value pre-appointed with the IWE, there is no listening interval to WiFi by sending the Association request message and receiving the Association response message from the AP (i.e., the cellular Receive paging via network) You can switch to WiFi power saving mode.

[0150] If a WiFi power saving (PS) mode indication is received with a message set to 1, PS mode is transferred to the PS mode to the AP through a WiFi PS mode switching method such as transmitting a null data frame set to '1'. You can immediately announce the transition. When the WiFi PS mode indication is 1, by specifying the WiFi listening interval, the Multi-RAT terminal can more efficiently use the power saving mode to WiFi.

[0151] If the WiFi pre-attach request message is used, transmission of the BSSID / SSID for the association AP is implicitly (implicit ly) power with the corresponding AP. saving mode indication and WiFi listening interval ⁰ ] "0" or a message indicating that the cell is set to a reserved value for receiving paging through the network. The mult i ᅳ RAT terminal completes the association when the message is received. Afterwards, it can mean switching to WiFi power saving mode without listening interval. That is, when the WiFi pre-attach request message is defined, only the BSSID / SSID for the pre-associat ion AP may be transmitted, or the WiFi listening interval may be explicitly transmitted as necessary.

As described above, when the Multi-RAT terminal receives the indicator indicating the power saving mode entry through the WiFi pre-attach request message, the multi-RAT terminal enters the power saving mode and enters the power saving mode to the AP. PM = 1).

[0153] The Multi-RAT terminal transmits a WiFi (pre) attach response message or a WiFi (pre) attach complete message to the IWE when both the previously defined AP and pre-association are successfully performed. Must be sent before is expired, and if the pre-association deadline timer expires, the pre-association is considered a failure.

[0154] The WiFi (pre) attach response message black or WiFi (pre) attach complete message may include the following parameters.

1) (Pre) ID of AP such as BSSID / SSID of association AP

2) Status result: Information indicating whether (pre) Association succeeded or failed.

3) If (pre) ᅳ associat ion fails, the cause of the failure is included.

4) indicator indicating whether the PS mode has entered (or transitioned): if the PS mode entry through the pre-association is defined as a new WiFi PS mode that does not receive a beacon message every listening interval, May not be transmitted, and in this case, the indication of whether the device enters or transitions to the PS mode may mean entering a new WiFi PS mode.

5) WiFi Listening interval

[0160] If a WiFi Listening interval value is transmitted,

1. The Multi-RAT terminal is a value set in actual WiFi, the value is "0" or

27 When set to a reserved value promised with I WE, the IWE may know that the UE enters a new WiFi PS mode.

2. If the corresponding value is not set to "u" or a reserved vaiue promised with IWE, the IWE may know that the terminal enters the existing WiFi PS mode.

6) Association Id (AID), IP address configured with the AP

In the new WiFi PS mode operation, the ilti-RAT terminal does not monitor the periodic broadcast signal (eg, beacon signal) of the AP that has completed the association until the instructions of the salary network are instructed. And, the mi ti-RAT terminal may receive the paging through the cellular network whether data can be transmitted from the associated AP.

[0165] Upon receiving the above WiFi (pre) attach response message or WiFi (pre) attach complete message from the Multi-RAT terminal, the IWE recognizes that the Multi-RAT terminal is attached to WiFi but enters a new WiFi PS mode. can do. The IWE may transmit a WiFi pre—attach complete ACK message to the Multi-RAT terminal. While the multi-RAT terminal is operating in the new WiFi PS mode, when the IWE receives data from the cellular network, the IWE may decide to transmit the data through the WiFi. The IWE may instruct the multi-RAT terminal to receive a WiFi beacon signal or transmit a message or indicator indicating that AID data has arrived. Accordingly, based on the indicator, the multi-channel RAT terminal may receive a beacon signal from the AP, switch to the Awake state with the AP, or operate in the awake state with the AP. The multi-RAT terminal can inform the IWE that it is a WiFi awake state.

As described above, in the new WiFi PS mode, the Multi-RAT terminal does not monitor the beacon of the AP which has completed the association until the cell tells the network to receive an instruction to receive the WiFi beacon signal from the cell network. By entering the WiFi awake state, the power saving effect of the Ui-RAT terminal is significantly improved.

As described above, in order to enable a multi-RAT terminal to efficiently use a secondary system (eg, WLAN / WiFO) by controlling a cellular network in a broadband wireless communication system, the secondary system idle mode operation of the terminal is performed. In particular, in the case of a multi-RAT terminal connected to WiFi in advance by the indication of the cellular network, the proposed new WiFi is proposed.

28 Minimal power usage is achieved by following the idle mode procedure.

Embodiments described above are those in which the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some components and / or features to constitute an embodiment of the invention. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of one embodiment may be included in another embodiment or may be substituted for any other configuration or feature of another embodiment ᅳ an embodiment is constructed by combining claims that are not expressly cited in the claims. It is obvious that the present invention may be incorporated into a new claim by a post-application correction.

It is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims _. All changes within the equivalent scope of the invention are included in the scope of the invention.

29

Claims

[Range of request]

[Claim 1]

In a method in which a terminal performs an idle mode operation with a specific communication system in a network in which a plurality of communication systems work together,

Interworking of the first communication system with the scanning result of the base station of the second communication system in a state of being connected to the RRC (Radio Resource Control) with the first communication system and in a disconnection mode with the second communication system Transmitting to an interworking entity;

A first indicator for instructing the terminal to perform an association process with a base station of the second communication system from an Internet ¾ entity of the first communication system and the terminal in a power saving mode with the second communication system; Sending a first message comprising a second indicator instructing to operate;

Performing an association process with a base station of the second communication system based on the first indicator of the first message; And

Entering the power saving mode from the disconnected mode with the second communication system based on the second indicator of the first message.

[Claim 2]

The method of claim 1,

Whether the interworking entity of the first communication system and the terminal support a pre-association procedure for performing an association process with a base station of the second communication system and entering the power saving mode; The method further comprises the step of negotiating.

[Claim 3]

The method of claim 1,

The first message is identifier information for the second communication system base station to perform an association process with the terminal, the terminal performs an association process with a base station of the second communication system and the power saving mode. To advance into _. The deadline time of the pre-association process

30 And at least one of information on information about a listening interval with a base station of the second communication system.

[Claim 4]

'As defined in claim 1,

And the base station of the second communication system is the preferred base station in the second communication system.

[Claim 5]

The method of claim 3, wherein

The terminal further includes starting a time limit timer of a pre-association process in advance when the terminal receives the first message.

[Claim 6]

The method of claim 1,

And transmitting, by the terminal, a third indicator to inform the base station of the second communication system to enter the power saving mode.

[Claim 7]

The method of claim 1,

An interworking entity of the first communication system is an eNode

B, 匪 E (Mobility Management Entity) and IWME (Inter orking Management Entity) any one of, the idle mode operation method of the terminal.

[Claim 8]

The method of claim 1,

If there is no downlink data to transmit to the second communication system,

1. A method of operating an idle mode of a terminal in which a first message including the second indicator is transmitted from an interworking entity of a communication system.

[Claim 9]

The method of claim 3, wherein The information about the listening interval indicates that the switching to the power saving mode without a listening period immediately after the association is completed, the idle mode operation method of the terminal.

[Claim 10]

The method of claim 9,

The terminal further comprises the step of receiving a paging message from the first communication system, the idle mode operation method of the terminal.

[Claim 111]

The method of claim 1,

Sending a second message to the interworking entity of the first communication system, the indicator including an indicator indicating that the procedure for entering a power saving mode and association with a base station of the second communication system has been completed; And

Receiving an answer message for the second message from the interworking entity of the first communication system;

[Claim 12]

The method of claim 11,

In case there is downlink data to be transmitted through the second communication system, it is notified that the periodic broadcast signal of the second communication system is to be received from the interworking entity of the first communication system or is transmitted downward through the second communication system. Receiving a fourth indicator indicating that there is link data; And

Receiving a periodic broadcast signal of the second communication system based on the fourth indicator to switch to an awake state with a base station of the second communication system or a base station of the second communication system based on the fourth indicator And operating in an awake state, the idle mode operation of the terminal

O H ·

[Claim 13]

The method of claim 1,

The first communication system is a cellular communication system and the second communication The system is a wireless LAN communication system, UE idle mode operation method.

[Claim 14]

In a terminal performing an idle mode operation with a specific communication system in a network interworking with a plurality of communication systems,

An interworking entity of a first communication system that scans a result of a base station of the second communication system in a radio resource control (RRC) connection state with a first communication system and in a connection mode with a second communication system. the first indicator and the terminal, the first indicator for instructing the terminal to perform an association process with the base station of the second communication system from an interworking entity of the first communication system. A transmitter configured to transmit a first message with a system, the first message comprising a second indicator instructing to operate in a power saving mode; and

Perform an association process with a base station of the second communication system based on the first indicator of the first message and in the disconnected mode with the second communication system based on the second indicator of the first message; And a processor for controlling to enter a power saving mode.

[Claim 15]

The method of claim 14,

The processor may include a pre-association procedure in which the interworking entity of the first communication system and the terminal perform an association process with a base station of the second communication system and enter the power saving mode. A terminal that controls to negotiate whether to support.

[Claim 16]

The method of claim 14,

And a receiver configured to receive a first message comprising the second indicator from an internet ¾ entity of the first communication system when there is no downlink data to send to the second communication system.

[Claim 17]

The method of claim 14,

33 The transmitter a second message including an indicator that the it indicates the procedure have completed the low gain entry to the association and, and a power saving mode of the base station and the ^first inter Wars King elementary tee and the second communication system of the first communication system And the receiver is configured to receive a response message to the second message from an interworking entity of the first communication system.

[Claim 18]

The method of claim 17,

The receiver notifies or receives the periodic broadcast signal from the interworking entity of the first communication system when there is downlink data to be transmitted through the second communication system or the _second communication. Receiving a fourth indicator indicating that there is downlink data to be transmitted through the system, and the processor receives a periodic broadcast signal of the second communication system based on the fourth indicator and the base station of the second communication system Transitioning to an awake state or receiving the fourth indicator and controlling to operate in an awake state with a base station of the second communication system.

34