WO2016114424A1

WO2016114424A1 - Communication method based on radio access level bearer splitting between plurality of communication systems in network linking plurality communication systems, and apparatus for same

Info

Publication number: WO2016114424A1
Application number: PCT/KR2015/000375
Authority: WO
Inventors: 최혜영; 조희정; 고현수; 변일무; 박경민
Original assignee: 엘지전자 주식회사
Priority date: 2015-01-14
Filing date: 2015-01-14
Publication date: 2016-07-21

Abstract

A method for a terminal communicating based on radio access level bearer splitting between a plurality of communication systems in a network in which the plurality of communication systems are linked, according to the present invention, may comprise the steps of: transmitting, to a base station of a first communication system, measurement information related to at least one base station of a second communication system, and an indicator indicating whether the radio access level bearer splitting is supported by the terminal; and receiving, from the base station of the first communication system, configuration information related to the radio access level bearer splitting, when determination has been made to split, on the radio access level, a bearer for allowing the base station of the first communication system to communicate with the second communication system and the terminal, according to the measurement information and the indicator.

Description

【Specification】

[Name of invention]

Method and apparatus for performing communication based on a bearer split of a wireless level between the plurality of communication systems in a network interworking with a plurality of communication systems

Technical Field

The present invention relates to a zone wireless communication, and more particularly, to a method and apparatus for performing communication based on a radio level bearer split between a plurality of communication systems in a network interworking with a plurality of communication systems. It is about.

Background Art

[002] In a wireless communication system, there may be a multi-RAT terminal having two or more radio access technology (RAT) or black (capabi 1ity) access to a communication system. To access a specific RAT, a connection to a specific RAT is established based on a terminal request and data transmission and reception are performed. However, even if 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 terminal has a multi-RAT capability, data transmission and reception are not possible at the same time through different RATs.

Since the conventional multi-RAT technology does not require interworking between the WLAN and the seller network, there is a problem in that the overall system efficiency is low. In addition, even if the terminal 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 cellular 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, In the case of Cel lular / Wi-Fi Radio level converged networks, no solution has been proposed to solve the problems related to cellular security and WLAN wireless security.

[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 communication based on a radio level bearer split (bearer spl it) between the plurality of communication systems in a network interworking with a plurality of communication systems. There is.

Another object of the present invention is to provide a base station of a first communication system in a network in which a plurality of communication systems interoperate to perform communication based on a radio level bearer split between the plurality of communication systems. To provide a way to do it.

Another technical problem to be achieved in the present invention is to provide a terminal for performing a communication based on a radio level bearer split (bearer spl it) between the plurality of communication systems in a network interworking with a plurality of communication systems. There is.

Another technical problem to be achieved in the present invention is a first communication system for performing communication based on a radio level bearer split between the plurality of communication systems in a network interworking with a plurality of communication systems To provide a base station of

Technical problems to be achieved in the present invention are not limited to the above technical problems, and other technical problems not mentioned may be clearly understood by those skilled in the art to which the present invention pertains. There will be.

Technical Solution

In order to achieve the above technical problem, a method in which a terminal performs communication based on a radio level bearer split between a plurality of communication systems in a network interworking with a plurality of communication systems, Transmitting to the base station of the first communication system measurement information for at least one base station of the second communication system and an indicator indicating that the terminal supports the bearer split of the radio level; And the first according to the measurement information and the indicator. If the base station of the communication system is determined to split the bearer for communication with the base station of the second communication system and the terminal at the radio level, bearer split configuration information of the radio level is received from the base station of the first communication system. Receiving may include. The radio level bearer split configuration information may include a logical channel identifier (LCID) for identifying a bearer that is split for communication with a base station of the second communication system and the terminal by the base station of the first communication system. Or, it may include a Data Radio Bearer DRB index and a traffic stream identifier corresponding to the LCID or the DRB index. The method includes encrypting data to be transmitted to the second communication system using a user-plane (U-plane) encryption key of a base station of the first communication system in a Packet Data Convergence Protocol (PDCP) layer; And transmitting the encrypted data to a base station of the second communication system. The MAC format field of the data includes the LCID value.

[011] The method includes receiving data including the LCID from a base station of the second communication system; And integrating the data in a radio link control (RLC) layer after confirming that the data is transmitted by bearer split based on the LCID. Even when the terminal does not form an association with the base station of the second communication system, the association may be omitted and the data may be received.

The method may further include receiving, from a base station of the second communication system, an indicator indicating that the base station of the second communication system supports the bearer split of the radio level.

The first communication system may be a cellular communication system, and the second communication system may be a wireless LAN (WLAN) communication system. .

In order to achieve the above technical problem, a base station of a first communication system communicates based on a radio level bearer split between the plurality of communication systems in a network interworking with a plurality of communication systems. Method for performing, measurement information for at least one base station of the second communication system from the terminal And receiving an indicator indicating that the terminal supports the bearer split of the radio level; Determining, by the base station of the first communication system, to split, at the radio level, a bearer for communication with the base station of the second communication system and the terminal based on the measurement information and the indicator; And transmitting the bearer split configuration information of the radio level to the terminal according to the determination. Bearer split configuration information of the radio level is the first logical channel identifier is a base station of a communication system that identifies the ^second, split the bearer to the base station and the communication with the terminal of the communication system (Logical Channel ID, LCID Or a Data Radio Bearer DRB index and a traffic stream identifier (TSID) for the LCID or DRB index. The method includes receiving data from a base station of the second communication system; And when the LCID is included in the data, integrating the data in a radio link control (RLC) layer to release encryption.

The first communication system may be a cellular communication system, and the second communication system may be a wireless LAN (WLAN) communication system.

The method further includes the step of transmitting the message requesting the bearer split of the radio level to the base station of the second communication system according to the determination, wherein the message requesting the bearer split of the radio level Is a logical channel identifier (LCID) or data radio bearer for identifying a split bearer for communication with a base station of the second communication system and the terminal by a base station of the first communication system; DRB) index may be included. The method further comprises receiving a message confirming a radio level bearer split from a base station of the second communication system as a response to the message requesting a bearer split of the radio level, wherein the radio level is received. The message identifying the bearer split of may include a traffic stream identifier (TSID) for the LCID or the DBR index.

In order to achieve the above another technical problem, a plurality of communication systems A terminal performing communication based on a radio level bearer split between the plurality of communication systems in an interworking network is a base station of a first communication system and measures at least one base station of a second communication system. A transmitter configured to transmit information and an indicator indicating that the terminal supports the bearer split of the radio level; And when the base station of the first communication system is determined to split a bearer for communication with the base station of the second communication system and the terminal at the radio level according to the measurement information and the indicator. The base station may include a receiver for bearer split configuration information of the radio level from the base station. The radio level bearer split configuration information includes a logical channel identifier (LCID) for identifying a splitter bearer for communication with a base station of the second communication system and the terminal by a base station of a first communication system. Or it may include a Data Radio Bearer (DRB) index and the traffic stream identifier (Traf f Stream Ident if ier, TSID) to the LCID or DRB index. The terminal further includes a processor configured to encrypt data to be transmitted to the second communication system using a user-plane (U-lane) encryption key of a base station of the first communication system in a Packet Data Convergence Protocol (PDCP) layer. However, the transmitter may be configured to further transmit the encrypted data to a base station of the second communication system. 8] In order to achieve the above another technical problem, the transmitter may be configured in a network interworking with a plurality of communication systems. A base station of a first communication system that performs communication based on a radio level bearer split between a plurality of communication systems includes: measurement information for at least one base station of a second communication system from a terminal; A receiver configured to receive an indicator indicating that the radio level bearer split is supported; And a processor configured to determine, based on the measurement information and the indicator, a base station of the first communication system to split at a radio level a bearer for communication with a base station of a second communication system and the terminal; And a transmitter configured to transmit the radio level bearer split configuration information to the terminal according to the determination. The bearer split configuration information of the radio level is determined by the base station of the first communication system. 2 Logical Channel ID (LCID) or Data Radio Bearer (DRB) index for identifying the split bearer for communication with the base station and the terminal of the communication system and the LCID or DRB index A traffic stream identifier may include a traffic stream identifier (TSID). In the terminal, the receiver is configured to further receive data from a base station of the second communication system, and the processor integrates the data in a Radio Link Control (RLC) layer when the LCID is included in the data. It may be configured to decrypt the encryption.

Advantageous Effects

In the Cel lular / Wi-Fi Radio level converged network, the wireless security used in the cellular network may be applied to data transmitted through the WLAN, thereby solving the problem of no wireless security of the WLAN.

[020] The effects that can be obtained in the present invention are 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 part of the detailed description to help understand the present invention, provide an embodiment of the present invention and together with the detailed 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.

FIG. 2 is a diagram illustrating a network structure of an E—UMTS (Evolved Universal Mobility Telecommunicat ions System).

FIG. 3 is a diagram illustrating a network structure for explaining an interworking structure between a first communication system (eg, a cellar communication system) and a second communication system (eg, a wireless LAN communication system).

FIG. 4 is an exemplary diagram for explaining a concept of security in an LTE / LTE-A system.

5 shows Reassociat ion Procedures in an IEEE 802.11 WLAN System Illustrated drawing.

6 is a diagram illustrating examples of a structure of a WiFi-Cel lular converged communication system.

[028] FIG. 7 is a diagram illustrating examples without bearer splitting as radio level integrat ion-radio protocol architectures.

FIG. 8 is a diagram illustrating examples of bearer split as radio level integrat ion-radio protocol architectures.

9 is an exemplary diagram for explaining a data split procedure according to 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, one of ordinary skill in the art appreciates 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-A, any other 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 Mob le Stat ion (MS), an Advanced Mobility Stat ion (AMS), an STA, and the like. In addition, it is assumed that the base station collectively refers to any node of the network terminal that communicates with the terminal such as Node B, eNode B, Base Stat ion, and AP (Access Point). 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 a base station through downlink ink, and the terminal may also transmit information through uplink ink. 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.

The following techniques are code division mult iple access (CDMA), frequency division mult iple access (FDMA), time division mult iple access (TDMA), orthogonal frequency division mult iple access (0FDMA), SC-FDMA (single single) carrier frequency division mult iple access). CDMA may be implemented with radio technologies such as UTRA Jniversal Terrestrial Radio Access) or CDMA2000. TDMA may be implemented in a wireless technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolut ion (EDGE). 0FDMA may be implemented with a radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRAC Evolved UTRA (etc.). UTRA is part of the UMTSOJniversal Mobile Telecommuni- cation Systems. 3GPP (3rd Generat ion Partnership Project) LTEdong term evolut ion is part of Evolved UMTS (E-UMTS) using E-UTRA and employs 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 the specific terms may be modified in other forms without departing from the technical spirit of the present invention. .

Although one base station 105 and one terminal (including 110XD2D terminal) are shown to simplify the wireless communication system 100, the wireless communication system 100 may include one or more base stations and / or one or more base stations. It may include a terminal.

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, and a memory 185. ， The receiver 190 may include a symbol demodulator 195 and a receive data processor 197. Then, 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 145, 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 a MIMC Mult iple Input Mult iple Output (MIC) system. In addition, the base station 105 according to the present invention may support both a single user-MIMO (SU-MIM0) and a multi-user-MIMO (MU-MIM0) scheme.

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

The symbol modulator 120 multiplexes the data and pilot symbols and sends it to the transmitter 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 transmitted one continuously. Pilot symbols may be frequency division multiplexed (FDM) or orthogonal frequency division multiplexed (OFDM), time division multiplexed (TDM), or code division multiplexed (CDM) symbols.

[042] 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. In order to generate a downlink signal suitable for transmission through a wireless channel, the transmission 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, filters, amplifies, and frequency downconverts), and digitizes the adjusted signal to obtain samples. Symbol demodulator 145 receives received pilot symbols. Demodulate them for channel estimation To the processor 155.

[044] The symbol demodulator 145 also receives a frequency response estimate for the downlink from the processor 155, performs data demodulation on the received data symbols, and estimates 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 is a data symbol. The estimates are demodulated (ie, symbol de-mapped), deinterleaved, and decoded to recover the transmitted traffic data.

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

Terminal 110 is on the uplink, the transmit data processor 165 processes the traffic data, and provides data symbols. The symbol modulator 170 may receive and multiplex data symbols and perform modulation to provide a stream of symbols to the transmitter 175. Transmitter 175 receives and processes the stream of symbols 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 reception antenna 130, and the receiver 190 processes the received uplink signal to obtain samples. The symbol demodulator 195 then processes these samples to provide 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 each of terminal 110 and base station 105 instruct (eg, control, coordinate, manage, etc.) operation at terminal 110 and base station 105, respectively. Respective processors 155 and 180 may be connected with memory units 160 and 185 that store program codes and data. Memory 160, 185 is coupled to processor 180 to store operating systems, applications, and general files.

[049] Processors 155, 180 are controllers, micro It may also be called a microcontroller, a microprocessor, a microcomputer, or the like. Meanwhile, the processor 155 (180 may be implemented by hardware or firmware (f irmware), software, or a combination thereof. When implementing an embodiment of the present invention using hardware, it is possible to implement the present invention, such as ASICs (digital signal processors), DSPDs (digital signal processing devices), Programmable logic devices (PLDs), yield programmable gate arrays (FPGAs), and the like may be included 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 modules, procedures or functions for performing the functions or operations of the present invention. The firmware or software configured to perform the operation may be provided in the processor 155 180 or may be stored in the memory 160 and 185 to be driven by the processors 155 and 180.

The layers of the air interface protocol between the terminal and the base station in the wireless communication system (network) are based on the first three layers (L1), based on the lower three layers of the open system interconnect ion (OS I) model well known in the communication system. And may be classified into a second layer L2 and a third layer L3. 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 storing function of the terminal 110 and the base station 105, respectively. For convenience of description, the processor 155 and 180 are not mentioned 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 mobility telecom systems system (E-UMTS). [054] The E-UMTS may be called like an 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. Referring to FIG. 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. The E-UTRAN includes one or more base stations. In terms of EPC, the MME / SAE gateway provides the endpoint's endpoint and mobility management functionality for the terminal. The base station and the MME / SAE gateway may be connected via the S1 interface. A base station is generally a fixed station that communicates with the terminal. In addition to being called a base stat ion, a base station may also be called an access point (AP). The base station provides end points of a user plane and a control plane to the terminal.

[055] A plurality of terminals may be located in one cell. One base station is generally arranged per cell. An interface for transmitting user traffic or control traffic may be used between the base stations. In this specification, "downl ink" refers to communication from a base station to a terminal, and "upl ink" refers to communication from a terminal to a base station.

The MME / SAE gateway provides ciphering and integrity of the distribution of paging messages to the base stations, security control, idle mobility control, SAR bearer control and non-access stratum (NAS) signaling. It provides various functions including protect ion. The SAE gateway provides several functions including terminating ion of U-plan packets for paging reasons, switching of U-plan to support terminal mobility. For convenience of description, the MME / 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 醒 E gateway and a SAE gateway.

[057] A plurality of nodes may be connected between the base station and the gateway through the S1 interface. Base stations may be connected to each other via an X2 interface, and neighboring base stations may have a meshed network structure with an X2 interface. [058] A network structure in which a plurality of communication systems using different wireless communication schemes interoperate with each other will be described.

3 is a diagram illustrating a network structure for explaining an interworking structure of a first communication system (eg, a seller communication system) and a second communication system (eg, a wireless LAN communication system).

In the present invention, an LTE / LTE-A system and a WiFi system are used as examples of the first communication system.

In the network structure shown in FIG. 3, a backhaul control connect ion is established between an AP and an eNB through a backbone network (for example, P-GW or Evolved Packet Core (EPC)). Or, there may be a wireless control connect ion between the AP and the eNB. For peak throughput and data traffic off-loading, the UE uses a first wireless communication scheme (eg, LTE / LTE-A) through interworking between a plurality of communication networks. It is possible to simultaneously support both a first communication system (or a first communication network) using a second communication system (or a second communication network) using a second wireless communication scheme (for example, WiFi). 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 / LTE-A and WiFi (local area communication system such as WLAN / 802.11). Such a terminal (UE) may be referred to herein as a multi-system support UE.

In the network structure shown in FIG. 3, the primary system has a wider coverage and may be a network for transmission of control information. An example of a primary system may be an 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. APs and primary systems that are access points for secondary systems (e.g. WiFi) It is assumed that base stations (eNBs) that are access points of (e.g., cellular communication systems such as LTE / LTE-A systems) are connected to each other on a radio link. In the present invention, an AP having a radio interface with an eNB should support not only 802.11 MAC / PHY but also an LTE protocol stack or a WiMAX protocol stack for communication with the eNB, and serve as a terminal and communicate with the eNB. Can be.

FIG. 4 is an exemplary diagram for illustrating a concept of security in a LTE / LTE-A system.

[064] LTE certification

When the UE (UE) requests access to the LTE network, mutual authentication between the user and the network is performed using the AKA procedure. The HSS transmits an authentication vector consisting of {RAND, XRES, AUTH _HS s, K _ASME } to 腿 E, which performs mutual authentication with UE (UE).醒 E stores the authentication vector and sends the RAND and AUTN _HSS values to the UE, and the UE generates the RES, AUTNUE, and K _ASME using the AKA algorithm and then sends the RES values to the MME. . The UE (UE) authenticates the network by comparing the AUTNUE value generated by the UE and the AUTNHSS value received from the E, and the E authenticates the user by comparing the XRES received from the HSS and the RES * received from the UE. If the password is 1, the terminal and E share the K _ASME .

[066] A security relationship of two layers is defined between a UE (UE) and an E-UTRAN black CN (Core Network), and the first layer is described as an access stratum (AS), which is an RRC between a user and a base station. Protect signaling and UP (User Plane) data. The second tier is described as non-access stratum (NAS), which is the distance between the user and E

Protect CP (Control Plane) signaling.

[067] NAS Secur i ty

After mutual authentication and sharing the K _ASME , the UE and the MME are NAS.

Perform the NAS Secur i ty Setup procedure to create a Secur i ty key. NAS Secur i ty

Setup is performed through a Securi ty Mode Command I Secury Mode Complete message, which is a NAS signaling message, and is initiated by 匪 E sending a Securi ty Mode Command message to the UE. [069] First, E selects the NAS Security algorithm and obtains the integrity key ^^ and the encryption key from K _ASME . Thereafter, a Security Mode Co 麵 and message including a NAS message authentication code (NAS-MAC) generated using a _{pre-integrated} integrity and encryption algorithm and K _NASint is transmitted to the UE.

After receiving the Security Mode Command message, the UE checks the integrity of the received message using a NAS Security algorithm selected by E and generates NAS Security keys (^ and ¾ _ASenc ). After that, NAS Security Setup is completed by sending Security Command Complete message to MME. The Security Mode Complete message is encrypted using ¾ ^ _∞ and then sent with the message authentication code NAS-MAC generated by ^^. After completing NAS Security Setup, NAS signaling messages between the UE and E are sent with integrity check and encryption.

[071] AS Security

[072] The UE (UE) and 丽 E that have completed mutual authentication calculate ΐ _ΝΒ from K _ASME , and ΜΜΕ sends it to eNB so that UE and eNB perform AS Security Setup procedure for generating AS Security key. . The AS Security Setup is performed through the Security Mode Command I Security Mode Complete message, which is an RRC signaling message, and is started by the eNB transmitting a Security Mode Command message to the UE.

[073] First, the eNB selects the AS Security algorithm, and then obtains the integrity key ¾ »(： ^ and encryption key！ ^ _사용할 to be used for the RRC signaling message from the K _eNB , and then obtains the encryption key！ ^^ to be used in the user plane. A Security Mode Command message including a message authentication code for integrity (MAC-I) generated using an integrity and encryption algorithm and KRRCint is transmitted to the UE.

After receiving the Security Mode Co 画 and message from the eNB, the UE checks the integrity of the received message using the AS Security algorithm selected by the eNB and receives AS Security keys (KRR _Cint , ½ _Cenc , p _enc ). Create After that, the AS Security Setup is completed by sending a Security Co Complete and Complete message to the eNB. This Security Mode Complete message is a message authentication code generated using ¾ «; ^ It is transmitted including MAC-I. After completing the AS Security Setup, the RRC signaling message between the UE and the eNB performs integrity check and encryption, and user plane data is transmitted with encryption.

Hereinafter, a description will be given of connection ion procedures of the IEEE 802.11 WLAN system.

In the connection procedure, the scanning step is divided into passive scanning and act ive scanning, and the terminal (for example, the STA) searches for the neighbor AP in the scanning step to store information, and stores the beacon frame of the neighbor AP. Receives and sends and receives probe and probe response frames. Next, as a join step, the UE selects and synchronizes an AP among discovered neighbor APs and collects information on the AP. Then, a beacon frame of the selected AP is received. Next, as an authentication step, the terminal is authenticated. In the open system authentication procedure, the AP performs authentication unconditionally upon the authentication request of the terminal, and the Shared Key authentication procedure performs authentication by confirming the shared secret key. Sends and receives an authentic icat ion frame. Next, in the associat ion step, the terminal is assigned an associat ion ID (Ident i fier) through an associat ion response frame, and transmits and receives an associat ion request and response frame.

5 illustrates Reassociat ion Procedures in an IEEE 802.11 WLAN system.

Reassociat ion occurs when a terminal (STA) moves to another AP cover age. A terminal (STA) transmits information on a medium access control (MAC) address of a current AP to a new AP through a reassociat ion request frame. Thereafter, IAPP (Inter-AP Protocol) messages are exchanged between the New AP and the Old AP. The new AP requests IAPP to relay the information of the old AP, and the old AP deletes the association ion id (AID) of the terminal. IAPP (Inter-AP Protocol) 802.11f is a protocol for exchanging context between APs through DS in a WLAN system, which caches PM information exchanged by the AP and uses an identifier (keylD) of a key used by the terminal in the old AP. When the reassociat ion request is made, the AP uses the cached PMK to skip the eye authentication and perform key exchange. [079] Briefly Describe Disassociation Procedures of IEEE 802.11 WLAN Disassociation is a notification, not a request. The AP needs to disassociate the terminals (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, including a reason code.

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

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

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

[083] Probe response frame: transmitted in response to the probe. Frame contn> l contains the Durat ion, DA, SA, BSSID, fragment number, Sequence, and frame and body are Time stamp, beacon interval, capability information, {SSID, supported rate, DS parameter set} IEs.

[084] Association related frames in the IEEE 802.11 WLAN system will be described.

Authentication frame (Authentication frame): Used in authentication request and the male and female, it is divided into the authentication transaction sequence because the format is the same. Frame contr contains 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 the power saving mode in the association request. Frame contr contains 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 contr contains Duration, DA, SA, BSSID, fragment number, Sequence, and frame body contains Capability information, Status Code, Association ID, Supported rates IE.

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

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

Reassociation response frame: The same frame as the Association response frame is used and the AID value assigned to the new AP is allocated. The Fr_ai ^ _c ltrol contains the Du a on DA, SA, BSSID, fragment number, Sequence, and the frame body contains Capability information, Status Code, Association ID, and Supported rates IE.

In the disassociat ion / Deauthent icat ion frame, the frame contr includes a Duration, DA, SA, SSID IE, fragment number, and sequence, and the frame body includes a reason code.

The above description of the IEEE 802.11 WLAN can be applied in the context of the present invention. The conventional inter RAT technology is designed based on the request of the terminal, does not require interworking between the WLAN and the cell network, a specific network server manages the WLAN information, and requests the inter Enable RAT handover. In addition, even if the terminal can simultaneously access the multiple RATs, simultaneous access to the multiple RATs can be achieved by supporting only the flow mobility / IP-flow mapping at the control network level at the radio level. It was made possible. For this reason, the prior art did not require any control connection between the AP and the cell network, and made it possible to access the Mult iple 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 not only the QoS of the UE through the use of Mult i-RAT, but also the overall network efficiency, it is necessary to provide a network-based tightly-coupled Mult iRAT management technology rather than the UE request. At the network level, more efficient, faster inter-RAT interworking is required by establishing direct control connect ion between different RATs. The advantages of the radio level convergence network are 1) enabling unified control and management of the mult i-RAT by the operator, and 2) radio resource management according to real-time channel and load conditions. 3) Rel iable Cel lular network can be used as control-mobi li ty anchor to improve QoE, minimize service interrupt ion, and more operator control. Radio level convergence networks are available in both col located and non-col located deployments.

However, in the conventional WLAN system, since the security method in the wireless section is not applied, it is more vulnerable to wireless security than the cellular communication system. In case of applying the radio level split (Wi-Fi) interworking between the cellular communication system and the WLAN system (Wi-Fi), the wireless security method of the cellular communication system can be applied. Improve the security of vulnerable WLAN. To apply this, when applying the wireless section security method of the saller communication system, a procedure for data security in the wireless section of the WLAN and a paron connection process in which a terminal connected to the saller communication system connects to the AP Is needed. In the present specification, splitting data (or bearers) at a radio level may be abbreviated as a radio level split.

Referring to FIG. 6A, a WiFi-Cel lular converged communication system may be configured. Including a base station (eel hilar BS) and WiFi APs, WiFi APs may be connected to the cell through the core network. Referring to FIG. 6B, a WiFi-Cel hilar converged communication system includes a cellular base station (Cell lular BS) and WiFi APs, and wirelessly communicates between the cellular base station and the WiPi AP through a radio access network (RAN) interface. Connection is possible. Referring to FIG. 6C, the WiFi-Cel lular converged communication system includes a cellar base station (eel hilar BS) and WiFi APs. The connected eAP may access the S-GW Mobility Management Entity (MME) through a core network interface. 6 (refer to 1, the WiFi-Cel lular converged communication system includes a mult i-RAT BS that supports both cel lular and WiFi communication, mult i-RAT BS can be connected to the S-GW \ E through .

Bearer Spl i t refers to the ability to split (black split) one bearer on a mult iple eNB, in dual connect ivity. When the UE performs dual access to the saller network and the WLAN network, the saller or the AP may configure the bearer of the terminal so that the bearer and the AP may simultaneously transmit / receive data of one bearer.

[098] FIG. 7 shows examples of no bearer split as radio level integrat ionr radio protocol architectures.

FIG. 7 illustrates a case in which the eNB does not split a bearer for data to be transmitted to the UE and the AP when transmitting data to the UE and the AP. In Alt 1, Alt 2, Alt 3, and Alt 4 shown in FIG. 7, the AP and the eNB do not have a bearer in which data is simultaneously transmitted through each RAT. . In Alt 1 and 2, the bearer transmitted through the AP is branched through the upper layer of the CN (Core Network) or the PDCP (Packet Data Convergence Protocol) to transmit data to the MAC layer of the AP.In Alt 3, the eNB transmits the PDCP layer. In the AU 4, the eNB transmits data to the MAC side of the AP through an RNC (Radio Link Control) layer.

In the case of a non-col located scenario, the Xn interface between the eNB and the AP is It needs to be defined. For col located scenarios (physically or logically), the Xn interface is not needed. The adapt ion layer needs to interwork the LTE protocol and WLAN protocol in each option (al t).

FIG. 8 is a diagram illustrating examples of bearer split as radio level integral ion-radio protocol architectures.

For communication in a dual connect ivi ty situation, the eNB may additionally configure a bearer for WLAN communication in addition to the bearer for data transmission to the terminal through the cell network. That is, the eNB uses separate bearers for data to be transmitted to the terminal and data to be transmitted to the AP through the cell network. FIG. 8 illustrates a case in which the eNB splits bearers for data to be transmitted to the UE and the AP when the eNB transmits data to the UE and the AP. In Al t 5, Al t 6 Al t 7, and Al t 8 shown in FIG. 8, the eNB has a separate bearer for data to be transmitted to the AP. Al t 5 is the eNB transmits data to the MAC layer of the AP through the upper layer of Packet Data Convergence Protocol (PDCP), Al t 6 is eNB transmits data to the MAC layer of the AP through the Xn interface in the PDCP layer , Alt 7 transmits data from the RNC (Radio Link Control) layer of the eNB to the MAC of the AP through the Xn interface. Al t 8 transmits the data to the MAC side of the AE via the MAC Rayon interface of the eNB. As such, when spl it data at the radio level (Radio level), the terminal is not applied in WLAN (e.g., Wi-Fi), but is applied in a wireless communication system (e.g., LTE). The data security method in the section can be applied, which has the advantage of transmitting / receiving more secure data. Cellular—In order to apply the security benefits of Wi-Fi radiolevel split, you must define a procedure for it. An initial connection is made when a terminal connected to the cellular communication system connects to an AP for radiolevel split. You can make the process faster.

[0103] The present invention proposes a procedure for data security in a wireless section of a WLAN and a procedure for fast connection in which a UE connected to a cellular network connects to an AP.

9 is a view for explaining a data split procedure according to the present invention. Exemplary drawing.

Referring to FIG. 9, the AP informs the terminal whether it supports radio level spoollets through a beacon signal (S910) or through the probe response message (probe response message). UE may be informed (S920). For example, the capability information element may be informed by adding a field indicating whether the radio level split is supported or the cellular -WiFi (cellular-wiFi) data split. The terminal may request whether to support radio level split through a probe request message, and in this case, only an AP supporting the radio level split may transmit a probe response message to the terminal (S920).

The terminal may perform channel measurement of the AP and may transmit a measurement report including an indicator indicating whether the AP supports the radio level split to the eNB of the cellular network (S930). In addition, the measurement report may include Capability information, Listen Interval information, {SSID (Service Set Identifier), Supported Rates} IEs (Information Elements) of the terminal. Although it is described that the measurement report includes an indicator indicating whether to support the radio level split, otherwise, the UE may transmit to the eNB separately from the measurement report.

[0107] Upon receiving the AP and the indicator indicating whether the terminal supports the radio level split from the terminal, the eNB may determine whether to split the bearer of the terminal (S940). More specifically, the eNB may determine whether to split the bearer and the bearer of the UE based on whether the UE supports the radio level split and the measurement report (S940). For example, when the value of RSSI (Received Signal Strength Intensity / Indication) of the AP that the UE has performed the measurement report is greater than or equal to a predetermined threshold, or when the load of the AP is less than or equal to a predetermined threshold, the eNB may perform the UE. It may be determined to split the bearer of (S940). When the eNB determines to split a specific bearer of the UE, it may transmit a data split request message to the AP (S950). The data split request message may include a terminal identifier (UE ID) and a Logical Channel ID (LCID) (5 bits) (each bearer may be identified by an LCID in a MAC) or a data radio bearer (DRB) index. Additionally Information received from the terminal (capability information, Listen Interval information), quality of service (QoS) information of a specific bearer (eg, GBR (Guaranteed Bit Rate), MBR (Maximum Bit Rate), etc.) in S930 You can,

As a response to the data split request message, it is possible to support a data spool for the terminal among the AP receiving the data split request message from the eNB _. The AP may transmit a data split response message to the eNB (S960). In this case, the AP may transmit information for configuring a TSCT traffic stream for the LCID for the data transmitted through the eNB to the eNB (S960). Information for setting the traffic stream includes a traffic stream identifier (TSID), the terminal identifier, the received LCID (5bits) or DRB index, Capability information, Status Code, Association ID, Supported rates, etc. Can be.

[0109] The eNB receiving the data split voice answer message from the AP may transmit a data split configuration message to the UE (S970). The data split configuration message may include an LCID (5 bits) received from the AP or a DRB index, Capability information, Status Code, Association ID, Supported rates, and a TSID based on the LCID. If a terminal that is not associated with the AP receives a data split configuration message, the terminal must connect to the AP in the past, but the process of connecting to the AP for data split is omitted. can do. In addition, the ADDTS The Add Traffic Stream process may be omitted.

[0110] The UE encrypts (or secures) a user-plane (U-lane) encryption key (eg, ciphering key) of the eNB in the PDCP layer even when transmitting data for the LCID informed by the eNB to the AP. To perform In addition, the terminal inserts the LCID value (or the existing Traffic Identifier) into the MAC format field of the data transmitted through the AP and transmits it. Receiving a data split request message from the eNB and responding to the data split, the AP sending the message to the eNB may know that the data is split with the eNB through an LCID value transmitted through a MAC frame of data received from a specific terminal. Extensible Authentication Protocol (EAP) After recognizing that the data is encrypted using the U-plane security key of the eNB without security, the data is bypassed to the eNB. Receiving data from the AP, the eNB integrates this in the PDCP / RLC (Radio Link Control) / MAC layer. The encrypted data can be decrypted (decryption) using the encryption key (eg, ciphering key) of the eNB in PDCP.

When the eNB receiving the data spoolit response message from the AP transmits data to a specific UE through the AP, the eNB performs encryption in the PDCP and inserts an LCID value into the MAC format and transmits the data to the AP. Upon receiving this, the UE confirms that the data received through the AP from the eNB is the bearer split data using the LCID value and integrates the data in the PDCP / RLC / MAC layer. Encrypted data can be solved using an encryption key (eg ciphering key).

As discussed above, in a Cel lular / Wi-Fi Radio level convergence network. The wireless security used in the network can be applied to the data transmitted through the WLAN to solve the problem of lack of wireless security of the LAN.

Embodiments described above are 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 of the components and / or features to form an embodiment of the invention. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit 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 is defined by the reasonable interpretation of the appended claims. It should be determined that all changes within the equivalent scope of the invention are included in the scope of the invention.

Industrial Applicability

115] A method for performing communication based on a bearer split of a radio level between a plurality of communication systems in a network interworking with a plurality of communication systems, and an apparatus therefor include an LTE, which is an example of a wireless communication system. Industrially available in / LTE-A systems and the like.

Claims

[0116] [claims]

[Claim 1]

In a network in which a plurality of communication systems interworking, the terminal performs communication based on a radio level bearer split between the plurality of communication systems,

Transmitting to the base station of the first communication system measurement information for at least one base station of the second communication system and an indicator indicating that the terminal supports the bearer split of the radio level; And

The base station of the first communication system according to the measurement information and the indicator determines to split a bearer for communication with the base station of the second communication system and the terminal at the radio level; Receiving the radio level bearer split configuration information from a base station, wherein the terminal performs communication based on the radio level bearer split.

[Claim 2]

The method of claim 1,

The radio level bearer split configuration information may include a logical channel identifier (ID) for identifying, by the base station of the first communication system, a split bearer for communication with a known terminal of the second communication system. Terminal based on radio level bearer split, including a Data Radio Bearer (LCID) or Data Radio Bearer (DRB) index and a Traffic Stream Identifier (TSID) for the LCID or DRB index. How to carry out communication by.

[Claim 3]

The method of claim 2,

Receiving data including the LCID from a base station of the second communication system; And

Further comprising integrating the data in a radio link control (RLC) layer after confirming that the data is transmitted by bearer split based on the LCID. How to do it.

[Claim 4]

The method of claim 3,

If the terminal does not form an association (associat ion) with the base station of the second communication system to skip the association (associat ion) process and receive the data,

[Claim 5]

The method of claim 1,

Receiving an indicator from the base station of the second communication system indicating that the base station of the second communication system supports the bearer split of the radio level;

[Claim 6]

The method of claim ² wherein

Encrypting data to be transmitted to the second communication system using a user-plane (U-plane) encryption key of a base station of the first communication system in a packet data convergence protocol (PDCP) layer; And

And transmitting the encrypted data to the last ⁷ times of the second communication system. 6. The method of the terminal, wherein the terminal performs communication based on a radio level bearer split.

[Claim 7]

The method of claim 6,

And wherein the MAC format field of the data includes the LCID value, wherein the terminal performs communication based on a radio level bearer split.

[Claim 8]

The method of claim 1,

And wherein the first communication system is a cellular communication system and the second communication system is a wireless local area network (WLAN) communication system.

[Claim 9] A method in which a base station of a first communication system performs communication based on a radio level bearer split between a plurality of communication systems in a network interworking with a plurality of communication systems, the method comprising:

Receiving measurement information for at least one base station of a second communication system from the terminal and an indicator indicating that the terminal supports the bearer split of the radio level;

Determining, by the base station of the first communication system, to split, at the radio level, a bearer for communication with the base station of the second communication system and the terminal based on the measurement information and the indicator; And

And transmitting the radio level bearer spoollet configuration information to the terminal according to the determination. The method of claim 1, wherein the base station of the first communication system performs communication based on the radio level bearer split.

[Claim 10]

The method of claim 9,

The radio level bearer split configuration information may include a logical channel identifier (LCID) for identifying a splitter bearer for communication with a base station of the second communication system and the terminal by the base station of the first communication system. Or a base station of a first communication system including a data radio bearer (DRB) index and a traffic stream identifier (TSID) for the LCID or the DRB index. A method of performing communication based on a flit.

[Claim 11]

The method of claim 9,

Sending a message requesting the bearer split of the radio level to a base station of the second communication system according to the determination;

The message for requesting the bearer split of the radio level may include a logical channel ID for identifying a bearer split by the base station of the first communication system for communication with the base station of the second communication system and the terminal. LCID) or Data Radio Bearer (DRB) indexes, And wherein the base station of the first communication system performs communication based on a radio level bearer split.

[Claim 12]

The method of claim n,

Receiving a message confirming a radio level bearer split from a base station of the second communication system as a response to the message requesting the radio level bearer split;

The message confirming the bearer split of the radio level includes a traffic stream identifier (TSID) for the LCID or the DBR index. A method for performing communications based on bearer splits.

[Claim 13]

The method of claim 10,

Receiving data from a base station of the second communication system; And converting the data into RLC (Radio Link) when the LCID is included in the data.

And integrating at the control layer to release the encryption, wherein the base station of the first communication system performs communication based on a radio level bearer split.

[Claim 14]

The method of claim 9,

And wherein the first communication system is a cellular communication system and the second communication system is a wireless local area network (WLAN) communication system, wherein the base station of the first communication system performs communication based on a radio level bearer split.

[Claim 15]

A terminal for performing communication based on a radio level bearer split between a plurality of communication systems in a network interworking with a plurality of communication systems,

Measurement information about at least one base station of the second communication system and the terminal to the base station of the first communication system and the terminal to the bearer split of the radio level A transmitter configured to send an indicator indicating support; And

The base station of the first communication system when the base station of the first communication system is determined to split a bearer for communication with the base station of the second communication system and the terminal according to the establishment information and the indicator; And a receiver for receiving bearer split configuration information of the radio level from the terminal.

[Claim 16]

The method of claim 15,

The radio level bearer split configuration information may include a logical channel identifier (LCID) for identifying a bearer split by a base station of the first communication system for communication with a base station of the second communication system and the terminal. Or a Data Radio Bearer (DRB) index and a Traffic Stream Identifier (TSID) corresponding to the LCID or DRB index.

[Claim 17]

The method of claim 16,

The second data to be transmitted to the communication system in the PDCP (Packet Data Convergence Protocol) layer, further comprising the document ^processor, configured to encrypt, using the first user- plane (U-plane) of the base station of the first communication system, the encryption key,

The transmitter is configured to further transmit the encrypted data to a base station of the second communication system.

[Claim 18]

A base station of a first communication system for performing communication based on a bearer split of a radio level between a plurality of communication systems in a network interworking with a plurality of communication systems,

A receiver configured to receive, from a terminal, measurement information for at least one base station of a second communication system and an indicator indicating that the terminal supports the bearer split of the radio level; And

Of the first communication system based on the measurement information and the indicator A processor configured to determine a base station to split a bearer for communication with a base station and a terminal of a second communication system at the radio level; And

And a transmitter configured to transmit the radio level bearer split configuration information to the terminal according to the determination.

[Claim 19]

The method of claim 18,

The radio level bearer split configuration information may include a logical channel identifier (LCID) for identifying a splitter bearer for communication with a base station of the second communication system and the terminal by the base station of the first communication system. Or a Data Radio Bearer (DRB) index and a Traffic Stream Identifier (TSID) for the LCID or DRB index.

[Claim 20]

The method of claim 19,

The receiver is configured to further receive data from a base station of the second communication system,

And the processor is configured to unencrypt the data by integrating the data in a Radio Link Control (RLC) layer when the LCID is included in the data.