WO2014054883A1 - Mobile communication system providing cellular service in heterogeneous networks, and user equipment using service in mobile communication system - Google Patents

Description

Mobile communication system providing cellular service in heterogeneous network and terminal using service in mobile communication system

The present invention relates to a mobile communication system providing a cellular service in a heterogeneous network and a terminal using a service in the mobile communication system.

Recently, with the development of a Long Term Evolution (LTE) network system and a smart phone, various services can be provided to a user. At the same time, with the explosive increase in the amount of wireless data used in the terminal, the telecommunications operators are examining and introducing various technologies to solve this problem.

In this regard, when a terminal, which has recently been connected to an LTE network and received a service, moves to a heterogeneous network such as WLAN or WiMAX, terminates the connection with the network where the service was previously provided, When attempting to connect to the network, there is a need for the introduction of technology that can provide a seamless service.

In particular, the wireless LAN that many users use to receive data service does not affect network operation because there is no signal interference with 3G / LTE, and it is easy to secure total data capacity for service provider at low cost, Because they are so limited, service providers are further looking at solutions such as small cells.

Therefore, when a terminal performs a handover between a heterogeneous network such as an LTE network and a wireless LAN, a research on a supporting technique for seamlessly performing a handover is required.

The present invention provides a mobile communication system and a terminal that can be provided to the existing cellular service seamlessly through a heterogeneous network when a terminal equipped with a wireless LAN modem or a WiMAX modem is connected to a wireless LAN system or a WiMAX system.

In a mobile communication system providing a service to a terminal according to an embodiment of the present invention, when the terminal hands over from a first network area to a second network area, a base station located in the first network area providing a service to the terminal A first function, which is an interworking function between the base station and an Evolved Packet Core (EPC), among the functions of, provides a service provided by the plurality of first base stations located in the first network area to the terminal on the second network. And a second network processing unit provided to the terminal through interworking with the EPC of one network, the EPC for controlling services to be provided to the terminal in cooperation with the plurality of first base stations and the second network processing unit, respectively. The first network is a Long Term Evolution (LTE) network, and the second network is a wireless LAN network or Any one of a WiMAX network, and the terminal includes a component for performing a second function of the function of controlling the terminal to interwork with the EPC of the function of the first base station through the second network processing unit. .

In addition, a terminal for providing a service to a user through a first network and a second network different from the first network according to an embodiment of the present invention, the first protocol processing unit for providing an LTE service to a terminal located in a first network area And a second protocol processor configured to provide a service through a wireless LAN or WiMAX to a terminal located in a second network area, implemented in the terminal, and processing a function of interworking with an EPC of the first network through a gateway on the second network. A terminal base station and a management unit for transmitting and receiving a signal for controlling or monitoring the terminal base station, wherein the first network area is an LTE area, the second network area is a wireless LAN or WiMAX area.

According to the present invention, when a terminal equipped with a modem accesses a wireless LAN system or a WiMAX system so that a communication service can be used in a heterogeneous network, the terminal may be provided with the existing cellular service without a break through the wireless LAN or WiMAX. have.

1 is an exemplary diagram of a mobile communication system according to an embodiment of the present invention.

2 is a diagram illustrating a construction of a mobile communication system according to an embodiment of the present invention.

3 is an exemplary view comparing a general base station and a CnW base station according to an embodiment of the present invention.

4 is an exemplary diagram illustrating a concept of a CnW base station according to an embodiment of the present invention.

5 is an exemplary diagram comparing a protocol structure of a user plane and a protocol structure of a general user plane according to an embodiment of the present invention.

6 is an exemplary diagram comparing a protocol of a control plane and a protocol of a general control plane according to an embodiment of the present invention.

7 is a structural diagram of a terminal according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

In the present specification, a terminal is a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user device (User). It may also refer to an Equipment (UE), an Access Terminal (AT), or the like, and may include all or some functions of a mobile terminal, a subscriber station, a portable subscriber station, a user device, and the like.

In the present specification, a base station (BS) may include an access point (AP), a radio access station (RAS), a node B (Node B), an eNB, a base transceiver station (BTS), MMR (Mobile Multihop Relay) -BS, etc. may be referred to, and may include all or part of the functions of an access point, a radio access station, a Node B, a base transceiver station, an MMR-BS, and the like.

Hereinafter, a mobile communication system and a terminal provided with a service in a mobile communication system according to an embodiment of the present invention will be described with reference to the drawings. That is, when the terminal 700 equipped with the wireless LAN modem is connected to the wireless LAN network from the LTE network, a mobile communication system and a terminal which can be provided without any existing service through the wireless LAN network will be described.

1 is an exemplary diagram of a mobile communication system according to an embodiment of the present invention.

As shown in FIG. 1, a mobile communication system according to an exemplary embodiment of the present invention generally includes a first network processing unit that provides a service to a terminal 700 through a first network, and a terminal 700 through a second network. And a second network processing unit for providing a service.

Here, it is assumed that the first network is an LTE network, and the second network is assumed to be a wireless LAN network or a WiMAX network.

The first network processor includes a plurality of LTE base stations 100, and the second network processor supports the gateway 500 and the terminal 700 to access and communicate with the second network. Point 600.

In addition, the mobile communication system according to an embodiment of the present invention includes an Evolved Packet Core (EPC) network interworking with the first network processor and the second network processor. The EPC includes a mobility management entity (MME) 200, a Serving Gateway (S-GW) 300, and a PDN Gateway (P-GW) 400 that interoperate with one or more LTE base stations 100 included in the first network processor. ).

The MME 200 is connected to the LTE base station 100 and the S-GW 300 to perform a mobility management function for authenticating the terminal 700 or managing the location or state of the terminal 700. That is, the terminal 700 processes a signal necessary for interworking with the EPC network, and confirms whether the terminal 700 is a subscriber of the operator. In addition, the MME 200 determines which base station the terminal 700 is currently connected to, and when the user tries to use the data service using the terminal 700, also serves to wake up the terminal 700. do.

The MME 200 relays a non-access stratum (NAS) message to the gateway 500 in place of the LTE base station 100. Information contained in the NAS is already known, and detailed descriptions thereof will be omitted in the embodiments of the present invention.

The S-GW 300 interworks with the P-GW 400 and performs an anchoring role when the terminal 700 performs handover between LTE base stations. In connection with the gateway 500, the terminal 700 transmits and receives user data to and from the terminal 700 entering the second network area.

The P-GW 400 not only performs an anchoring role when the terminal 700 performs handover between the S-GWs 300, but also allocates an IP address to the terminal 700 and manages a quality of service (QoS). . Functions of the S-GW 300 and the P-GW 400 are already known, and detailed descriptions thereof will be omitted in the embodiments of the present invention.

The gateway 500 interworks with the terminal 700, the S-GW 300, the LTE base station 100, the MME 200, and the wireless access point 600, and is a part of the functions of the general LTE base station 100. Perform the function. Here, the first function means a function required for interworking with the MME 200, the LTE base station 100, and the S-GW 300, that is, the EPC interworking function.

That is, the first function includes a function of routing or transmitting user plane data between the terminal 700 and the S-GW 300, and termination processing of the PDCP layer of the terminal 700. It will be described later in detail. Meanwhile, the second function, which is a part of the functions of the general LTE base station 100, is performed by a component mounted in the terminal 700, which will be described in detail later.

In addition, when the gateway 500 receives the target base station information from the MME 200 for the terminal 700 to handover from the second network area to the macro area of the LTE area, the gateway 500 transmits the information to the terminal 700 to the target. Inform information of the base station.

The wireless access point 600 interworks with the terminal 700 and the gateway 500 to perform a relay function through a wireless interface. To this end, the wireless access point 600 relays data transmitted and received through the Simple Radio Resource Control (SRRC) layer and the Packet Data Convergence Protocol (PDCP) layer through a wireless interface. These layers are layers for transmitting and receiving data to process control plane data or to process user plane data.

Here, the control plane data is data necessary for processing a control signal for controlling the establishment, maintenance, and release of a communication connection on a network, and the user plane data is data that a user wants to send or receive. The control plane and the user plane are already known and detailed descriptions thereof will be omitted in the embodiments of the present invention.

In such a mobile communication system, a service is provided according to a CnW (Cellular network over WLAN) technology according to an embodiment of the present invention. Here, the CnW is connected to a second network providing a service through a wireless LAN or a WiMAX from a first network providing a service through the LTE, when the terminal 700 equipped with the wireless LAN modem or the WiMAX modem is connected to the second network. By providing a cellular-based service for the terminal 700, a technology that enables the terminal 700 to provide a communication service without interruption even in the process of performing a handover between heterogeneous networks from the first network to the second network Refers to. In an embodiment of the present invention, this is referred to as CnW, but does not necessarily use such a limited term. The terminal 700 is equipped with a SeNB (Simple Evolved Node B) for processing a CnW function, which is called a terminal base station.

In other words, in order to provide CnW LTE technology according to an embodiment of the present invention as shown in FIG. 1, the terminal 700 supporting the CnW function is connected to the wireless access point 600, the MME 200, and the S-GW 300. The service is provided by interworking with the gateway 500 interworking like the LTE base station 100. In this case, the wireless access point 600 and the gateway 500 may be connected to a dedicated line of a service provider or a general Internet line. That is, if the network is performed IP routing from the terminal 700 to the gateway 500, it can provide a service according to an embodiment of the present invention.

While supporting the CnW terminal 700 is provided with the LTE service through the LTE base station 100, the wireless LAN modem or WiMAX modem mounted on the terminal 700 is turned on, and the wireless access point 600 If it is possible to connect to the second network, the IP line quality to the gateway 500 is measured through the wireless access point 600. If the measurement results confirm that the IP circuit quality is good, even if the UE moves to the CnW zone through the TAU or handover procedure of the S1-MME Control Plane Protocol, continuous LTE service can be provided.

A construction example of the mobile communication system described above will be described with reference to FIG. 2.

2 is a diagram illustrating a construction of a mobile communication system according to an embodiment of the present invention.

As shown in FIG. 2, in the LTE network, at least one CnW service area 900 may exist in the macro zone 800, such as an umbrella zone. In addition, the LTE base station 100 and the gateway 500, which are macro eNBs, provide LTE services to the terminal 700 under the same MME 200.

That is, the macro region 800 and the CnW service region 900 perform S1 handover for the terminal 700 through the same MME 200. The LTE base station 100 in the macro region 800 manages the gateway 500 as a general neighbor cell. In addition, since the CnW service area 900 formed in a specific area, such as a subway, moves the macro area 800, the terminal 700 must periodically collect and manage macro cell information for immediate handout processing.

In the embodiment of the present invention, in order to provide a CnW LTE service, the terminal 700, when the terminal 700 performs a handover from the LTE base station 100 to the wireless access point 600, as if the LTE base station 100 S1 through the gateway 500 and the first module that processes the control plane data, such as radio resource allocation with the gateway 500 to interlock with the MME 200 through the gateway 500 as if S1 handover is performed between A second module for controlling transmission and reception of user plane data to the GW 300 is mounted.

In addition, the gateway 500 may handover from the LTE base station 100 to the wireless access point 600 through the MME 200 in association with the first module mounted in the terminal 700. The first gateway module and the terminal 700 for processing the control plane data to transmit and receive the user plane data with the S-GW 300 through the second module mounted in the terminal 700, A second gateway module interoperating with the second module is mounted.

That is, in the embodiment of the present invention, even if the terminal 700 accesses the wireless access point 600 that does not provide the LTE service, the terminal 700 continues to operate as if the LTE service is continuously provided. In order to interoperate with the EPC through the wireless access point 600, the terminal 700 and the gateway 500 may be equipped with the same module as the functional module included in the general LTE base station.

Here, according to an embodiment of the present invention, for convenience of description, the functional module of the general LTE base station mounted in the terminal 700 and the gateway 500 is referred to as a CnW base station, which will be described with reference to FIG. 3.

3 is an exemplary view comparing a general base station and a CnW base station according to an embodiment of the present invention.

As shown in FIG. 3, the LTE network is a form in which the terminal 700 accesses the MME 200 and the S-GW 300 through the LTE base station 100. However, in order to provide a service through the CnW LTE technology according to an embodiment of the present invention, the LTE base station 100 is divided into three parts as follows to implement as an example.

First, the air interface portion of the LTE base station 100 is implemented by separating the radio access point 600 part. In this case, a wireless LAN repeater using IEEE 802.11 technology will be described as an example. And the interworking management part with the terminal of the function of the LTE base station 100 to be mounted to the terminal 700 as a component of the terminal base station to be performed. The LTE base station 100 and the S-GW 300 and the MME 200 interworking part are divided and processed by the gateway 500.

That is, the main functions of the existing LTE base station 100 are implemented by dividing the terminal base station and the gateway 500 mounted on the terminal 700, and the radio interface technology to use IEEE 802.11. This uses part of the wireless LAN frequency band, not LTE frequency, and part of RRC (Radio Resource Control) except LTE radio resource management functions such as LTE Physical (HY), Medium Access Control (MAC), and Radio Link Control (RLC). Only PDCP and NAS (Non-Access Stratum) processing functions are performed in the terminal 700 for the CnW function.

As described above, the concept of the CnW base station for performing the function of the existing LTE base station 100 through the base station separated by the terminal 700 and the gateway 500 will be described with reference to FIG. 4.

4 is an exemplary diagram illustrating a concept of a CnW base station according to an embodiment of the present invention.

As shown in FIG. 4, the general LTE base station 100 processes all functions required for the control plane and the user plane in the base station. However, the base station for the CnW function according to an embodiment of the present invention is separated into a terminal base station mounted in the terminal 700 and a gateway 500 installed on a network to process each function separately. To this end, the terminal base station and the gateway 500 include SRRC and PDCP, respectively, which process some of the functions of the RRC.

That is, the terminal 700 includes SRRC and PDCP for the base station to perform some functions of the base station in addition to the RRC and PDCP mounted on the existing terminal. In addition, the gateway 500 includes SRRC and PDCP to process some of the functions of the general LTE base station 100.

Here, PDCP, which is one of the layers of the radio traffic stack, encrypts data transmitted and received in addition to a function of compressing or decompressing an IP header, transmitting user data, and maintaining a sequence number for a radio bearer. It also performs integrity checking. Therefore, the security function, which was somewhat weak when using the WLAN service, is included in the terminal 700 so that the PDCP function part of the base station can provide the security function.

A terminal base station and a gateway having this concept perform the following functions, respectively.

First, the terminal base station transmits and receives user plane data between the terminal 700 and the gateway 500 through a data radio bearer (DRB) which is a data radio bearer. And performs a radio bearer control function between the terminal 700 and the gateway 500 through a signaling radio bearer (SRB). The user plane data is data that a user wants to send or receive.

In addition, the terminal base station updates the tracking area (TAU: Tracking Area Update) to the CnW service area, or hand-in or hand-out the terminal 700 to the CnW service area. It performs connection mobility control function for. That is, the main base station processes main decisions such as TAU, hand in, and handout processing instead of the base station.

In addition, the terminal base station reports the macro cell information in which the terminal 700 is located to the gateway 500 through a periodic automatic neighbor relation function (ANRF) for immediate handout processing. In addition, the terminal base station measures the radio quality of the wireless access point 600 according to the period set by the operator policy. In addition, the terminal base station exchanges a heartbeat message to the gateway 500 according to the period set by the operator policy, measures the round trip time (RTT) of the message, and measures the overall line quality.

Meanwhile, the gateway 500 routes and transmits and receives user plane data between the terminal 700 and the S-GW 300, and performs PDCP layer termination processing of the terminal 700. The gateway 500 controls the radio bearer between the terminal 700 and the gateway 500 and controls the S1 bearer between the gateway 500 and the S-GW 300.

In addition, the gateway 500 manages a connection state of the terminal 700 moved to the CnW service area. In addition, not only one or more terminals 700 may be managed according to the capacity of the gateway 500 system, but one or more terminals 700 may perform CnW services according to radio quality or line quality in the same wireless access point 600. Manage to help. In addition, TAU, hand-in or hand-out processing is performed for the terminal 700 through the MME 200 and the S-GW 300 interworking.

In addition, the gateway 500 transmits a paging message to a specific terminal located in the CnW region, and allows the MME 200 to be recognized as one base station. The gateway 500 interworks with the S-GW 300 and controls other base stations to interoperate with the MME 200 and the S-GW 300.

In the following, the protocol structure is divided into the user plane protocol and the control plane protocol and the comparison is made with the user plane protocol and the control plane protocol in the general 3GPP E-UTRAN. This will be described with reference to FIGS. 5 and 6.

5 is an exemplary diagram comparing a protocol structure of a user plane and a protocol structure of a general user plane according to an embodiment of the present invention.

First, FIG. 5A illustrates a user plane protocol structure in a general 3GPP E-UTRAN, and FIG. 5B illustrates a user plane protocol structure according to an embodiment of the present invention.

According to the protocol structure of the user plane to which the CnW LTE technology is applied, the PDCP layer of the terminal 700 is divided into two according to the position of the terminal 700. That is, when the terminal 700 is located in the macro area instead of the CnW service area, as shown in FIG. 5 (a), the UE 700 processes the user plane data by interworking with the LTE base station in the macro area through the RLC, MAC, and LTE PHY. do. A method of processing user plane data according to FIG. 5A is already known, and detailed descriptions thereof are omitted in the exemplary embodiment of the present invention.

However, when the terminal 700 is located in the CnW service area, as shown in FIG. 5B, the PDCP layer is connected to the gateway 500 through the wireless access point 600 via UDP / IP, and user plane data. To process That is, the PDCP layer of the terminal 700 transmits and receives data transparently with the gateway 500, and the PDCP PDU is terminated at the gateway 500. Thereafter, the user plane data is transmitted and received with the S-GW 300 through the GTP-U on the S1-U interface.

6 is an exemplary diagram comparing a protocol of a control plane and a protocol of a general control plane according to an embodiment of the present invention.

6 (a) shows a control plane protocol in a general 3GPP E-UTRAN, and FIG. 6 (b) shows a control plane protocol according to an embodiment of the present invention.

According to the protocol structure of the control plane to which the CnW LTE technology is applied, the RRC layer of the terminal 700 is divided into two according to the position of the terminal 700. That is, when the terminal 700 is located in the macro area instead of the CnW service area, as shown in FIG. 6 (a), the terminal 700 interworks with the LTE base station 100 in the macro area through PDCP, RLC, MAC, and LTE PHY. Process control plane data. A method of processing control plane data according to FIG. 6A is already known, and detailed descriptions thereof will be omitted in the embodiments of the present invention.

However, when the terminal 700 is located in the CnW service area, as shown in FIG. 6B, the RRC interworks with the gateway 500 through the SRRC and the wireless access point 600 to control the control plane data. Process. Here, the RRC message is converted for the CnW function in the Simple Radio Resource Control (SRRC) layer and transmitted to the gateway 500, and the NAS message is transparently transmitted and received to the MME 200 through the RRC, SRRC, and PDCP.

As shown in FIG. 5 and FIG. 6, all messages in the user plane and the control plane use the same PDCP layer used in the existing LTE network, thereby ensuring data encryption and integrity and transmitting and receiving with the gateway 500. Therefore, even in networks that provide services through WLAN, data encryption and data integrity guarantees are continuously provided without any additional equipment (eg, SeGW (Security G / W)).

As described above with reference to FIG. 7, a structure of a terminal 700, in which a part of a base station function is mounted and interoperates with the gateway 500 and seamlessly processes an LTE service even through a wireless LAN, will be described.

7 is a structural diagram of a terminal according to an embodiment of the present invention.

As shown in FIG. 7, the terminal 700 includes a first protocol processor 710, a second protocol processor 720, a terminal base station 730, and a manager 740.

When the terminal 700 is located in a macro region that provides an LTE service, the first protocol processor 710 processes the LTE protocol and provides an LTE service to the terminal 700. To this end, the first protocol processing unit 710 includes a NAS processing unit for controlling the terminal 700 as a top protocol, an RRC processing unit for controlling a radio resource, and a PDCP processing unit for compressing or encrypting transmitted / received data or confirming data integrity. . In addition, the first protocol processor 710 is a Radio Link Control (RLC) processor that performs segmentation and reassembly and ARQ functions, and allocates radio resources according to priority to each bearer, It includes a MAC processor for multiplexing data received from several logical channels and LTE PHY processing unit for connecting the physical protocol of the terminal 700.

When the terminal 700 is located in an area for providing a wireless LAN service, the second protocol processor 720 provides a service to the terminal 700 using a wireless LAN protocol. To this end, the second protocol processor 720 includes a PDCP processor, a TCP processor, a UDP processor, an IP processor, an LLC / MAC processor, and a WLAN PHY (eg, 802.11 PHY) processor.

Here, the TCP processing unit for processing the TCP interworks with the terminal base station 730 through the PDCP processing unit, and the UDP processing unit for processing the UDP interworks with the terminal base station 730. The LLC / MAC processing unit for processing the LLC / MAC also checks whether the wireless access point for the terminal 700 is on or off in cooperation with the terminal base station control unit 733 of the terminal base station 730. It performs along with functions such as measuring the quality of wifi. The WLAN protocols processed by the second protocol processor 720 are already known, and detailed descriptions thereof will be omitted in the exemplary embodiment of the present invention.

In the exemplary embodiment of the present invention, the first protocol processor and the second protocol processor are respectively described as including a PDCP processor. However, the first protocol processor 710 processes or processes the first protocol processor 710 according to whether the CnW function is activated. 2 may be processed through the protocol processor 720. In the embodiment of the present invention, for convenience of description, the first and second protocol processing units 710 and 720 may include the processing units, respectively, but may also mean each protocol.

Here, when the terminal 700 is located in the macro region, the control plane data is transmitted and received through the NAS processing unit, RRC processing unit, PDCP processing unit, RLC processing unit, MAC processing unit and LTE PHY processing unit. In addition, when the terminal 700 is located in the macro region, the UE 700 transmits and receives user plane data through an application, a PDCP processor, an RLC processor, a MAC processor, and an LTE PHY processor.

On the other hand, when the terminal 700 is located in the CnW service area, the NAS processing unit, the RRC processing unit, the SRRC processing unit, PDCP processing unit, TCP processing unit, IP processing unit, LLC / MAC processing unit, included in the terminal base station 730 to be described later, The controller transmits and receives control plane data through the WLAN PHY processor. When the terminal 700 is located in the CnW service area, an application, a PDCP processing unit, a DRB relay unit, a UDP processing unit, an IP processing unit, an LLC / MAC processing unit, a WLAN PHY processing unit included in the terminal base station 730 to be described later. Through the user plane data transmission and reception through.

The terminal base station 730, which enables the terminal 700 to perform a terminal interworking function that is a part of the function of the base station, is an SRRC processing unit 731, a DRB relay unit 732, a terminal base station control unit 733, and an interface unit 734. It includes.

The SRRC processing unit 731 is used for the control plane interface between the terminal 700 and the gateway 500. The SRRC processing unit 731 interoperates with the TCP processing unit and the RRC processing unit of the first protocol processing unit 710 via the PDCP processing unit of the second protocol processing unit 720 to control data radio resources. The terminal 700 performs a function of maintaining and managing generation of a data radio bearer (DRB) for transmitting and receiving user plane data through a wireless LAN. The SRRC processing unit 731 may be implemented as an SRRC layer, and performs an abbreviation function by removing only the LTE radio management function from the RRC layer. That is, the control plane message required for the CnW function is processed to replace the LTE-Uu interface between the terminal 700 and the gateway 500.

Through this, the NAS message is transparently transmitted and received between the terminal 700 and the gateway 500, the SRRC message is extracted from the RRC message only the portion necessary for the CnW function from the prototype to send and receive. In addition, the SRRC processing unit 731 processes a function message added for stable CnW service.

The SRRC layer section transmits and receives a message through TCP communication. The main messages used in the SRRC layer section are as follows.

First, the CnW service information request / response message is a message used when the terminal 700 requests various information from the gateway 500 to start the CnW service. Transmission information transmitted from the terminal 700 to the gateway 500 includes identification information of the LTE base station 100 to which the terminal 700 is currently connected and globally unique MME identifier (GUMMEI), which is unique information identifying the MME 200. For example, the location information of the current terminal 700 and the Mobile Subscriber Integrated Services Digital Network-Number (MSISDN) or the International Mobile Subscriber Identity (IMSI) information of the terminal are included. The information transmitted from the gateway 500 to the terminal 700 includes IP, CnW service area service policy, handover threshold, and WLAN QoS threshold information of the gateway 500 to be accessed for the actual service. The service information request / response message is processed only in the macro cell of LTE before the CnW service is activated in the terminal 700, and the terminal 700 periodically requests the service information from the gateway 500 according to the CnW service policy. .

The CnW connection request message among the CnW Attach Request / Response messages is a message for the terminal 700 to request registration to start the CnW service to the gateway 500. This message includes integrity check information, S-TMSI, IMSI, GUMMEI, and macro base station ID information. In addition, the CnW connection response message is a message that the gateway 500 responds to the registration state to the terminal 100, and includes gateway base station ID, TAI, service policy of the CnW service area, handover threshold, and WLAN QoS threshold information. have.

The CnW detach report message is a message informing the gateway 500 of the CnW service termination and the LTE service termination when the terminal 700 is powered off in the CnW service area.

The CnW Initial UE Message is a message in which the terminal 700 relays a NAS message to the MME 200 for providing a CnW service to a user through a wireless LAN network in an idle state. The NAS message may include a connection request, a TAU request, a service request, and the like.

The CnW Downlink NAS transport message is a message used by the gateway 500 to relay a NAS message received by the MME 200 to the terminal 700.

The CnW Uplink NAS transport message is a message used by the terminal 700 to relay NAS messages to the MME 200 through the wireless access point 600 and the gateway 500.

The CnW E-RAB Setup Request / Response message is a message used for allocating one or more E-RAB resources between the terminal 700 and the gateway 500. In this case, the gateway 500 requests CnW E-RAB setup to the terminal 700, and the terminal 700 transmits a response message to the setup request after allocating an E-RAB resource to the gateway 500.

The CnW E-RAB Release Command / Complete message is a message used for releasing an E-RAB resource allocated between the terminal 700 and the gateway 500. At this time, the gateway 500 requests the terminal 700 to release the CnW E-RAB resource, and the terminal 700 releases the E-RAB resource to the gateway 500 and then transmits a response message to the request.

The CnW paging message is a message used to wake the terminal 700 in the idle state in the CnW service area, and is transmitted by the gateway 500 to the terminal 700.

The CnW Release Command / Complete message is a message used for releasing all resources allocated between the terminal 700 and the gateway 500. At this time, the gateway 500 requests the terminal 700 to release the resource, and the terminal 700 releases the resource to the gateway 500 and then transmits a response message to the request.

The Handover request / Request Ack message is used by the terminal 700 to hand in to a CnW service area providing a second network service in an LTE network providing a first network service. In this case, the gateway 500 operates as a target base station in the first network service. When the gateway 500 receives the handover request message from the MME 200, the terminal 700 generates and allocates connection information and bearer information for use when handing in the gateway 500 to the MME 200. .

The CnW handover notify message is a message used by the terminal 700 in the process of handing in from the macro area to the CnW service area, and the gateway 500 operates as a target base station. The terminal 700 uses the CnW handover notification message to notify the gateway 500 that the handover starts when the handover is started after the preparation for handover to the CnW service area is completed. In this case, the terminal 700 is connected to both the LTE network and the wireless LAN network.

The CnW Handover Complete message is a message used during the UE 700 handing in from the macro area to the CnW service area, and the gateway 700 operates as a target base station. When downlink traffic is generated from the S-GW 300, the gateway 700 transmits a CnW handover complete message to inform the terminal 700 of the completion of the handover.

The CnW Handover Required message is a message used when the terminal 700 performs a handout from the CnW service area to the macro area, and the gateway 500 operates as a source base station in the first network service. When the terminal 700 determines that the state of the WLAN network is bad or the line quality to the gateway 500 is bad, the terminal 700 requests a handover to the gateway 500 to move to the LTE network. In this case, the terminal base station 730 selects an optimal macro base station as a target base station.

The CnW Handover Command message is a message used when the terminal 700 performs a handout from the CnW service area to the macro area, and the gateway 500 receives target base station information for handover from the MME 200. This is a message used to receive and transmit to the terminal 700.

The CnW hearbeat message starts after a normal CnW connection request / response message, and according to the CnW service policy cycle until the CnW end announcement message or the CnW requested handover message is processed, the terminal 700 and the gateway 500. This message is used to check the connection status for the entire line.

In addition to the above-described message, additional control messages may be newly defined to provide a CnW service, and embodiments of the present invention are not limited to any one control message. In addition, the function of the above-described message is not necessarily limited to the above-mentioned.

Meanwhile, in FIG. 7, the DRB relay unit 732 relays the user plane data to the terminal 700 entering the CnW service area in association with the UDP processor and the PDCP processor of the second protocol processor 720. At this time, the DRB relay unit 732 checks the location of the gateway 500 and relays the messages to the gateway 500. The PDCP PDU generated between the terminal 700 and the gateway 500 is not changed during the relay process. That is, header compression and ciphering functions, which are the main functions of PDCP, remain unchanged.

In the CnW service area, user plane data transmits and receives a message through UDP communication in the interval between PDCP, checks PDCP Sequence Number (SNCP) parameter of PDCP Protocol Data Unit (PDU), and performs overall circuit state management including wireless LAN interval. do. The PDCP layer of the terminal 700 requires RLC termination processing for CnW service and seamless PDCP function processing.

In the PDCP and PDCP relay sections of the CnW-UE, there is a method in which a PDCP relay performs RLC termination or PDCP directly processes an RLC termination. That is, the RLC termination processing is processed by the PDCP processing unit or the DRB relay unit 732 of the terminal 700 according to the implementation method.

The terminal base station controller 733 interworks with the NAS, RRC, and PDCP processing units, and when the terminal 700 enters a CnW service area that is a wireless LAN area and the CnW function is turned on or enters the wireless LAN area, and the CnW function is turned off. To control the flow of data. In addition, the terminal base station control unit 733 controls to monitor and control the wireless LAN through the second protocol processing unit 760 in cooperation with the LLC / MAC processing portion of the second protocol processing unit 760.

The interface unit 734 interworks with the management unit 740 of the terminal 700 to transmit and receive a signal for controlling or monitoring the terminal base station 730.

The management unit 740 transmits and receives a signal for controlling or monitoring the terminal base station 730 in cooperation with the interface unit 734. Then, in conjunction with the PDCP processing unit through the CnW service request / response message, when the first terminal 700 is driven, it requests information for service start. Since the components for providing the CnW service are inactive when the terminal 700 is initially driven, the terminal 700 requests information for service initiation through the first protocol processor 710 for providing the LTE service.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (11)

In a mobile communication system providing a service to a terminal, When the terminal hands over from the first network area to the second network area, a first function that is an interworking function between the base station and an Evolved Packet Core (EPC) among the functions of the base station located in the first network area providing the service to the terminal. A second network processor configured to provide a service provided by the plurality of first base stations located in the first network area to the terminal through interworking with the EPC of the first network on the second network; ; And The EPC which controls to provide a service to the terminal by interworking with the plurality of first base stations and the second network processing unit, respectively. Including; The first network is a Long Term Evolution (LTE) network, and the second network is either a wireless LAN network or a WiMAX network. The terminal includes a component for performing a second function, which is a function of controlling the terminal to be interoperable with the EPC through the second network processing unit among the functions of the first base station. The method of claim 1, The second network processing unit, A gateway interworking with the plurality of first base stations and the EPC and processing the first function through a Simple Radio Resource Control (SRRC) layer and a Packet Data Convergence Protocol (PDCP) layer; And A wireless access point that transmits and receives a signal through an air interface so that the gateway and the terminal process control plane data and user plane data through the SRRC layer and the PDCP layer in association with the gateway and the terminal. Mobile communication system comprising a. The method of claim 2, A mobile communication system transmitting and receiving a signal between the terminal and the wireless access point through a wireless LAN frequency band or WiMAX frequency band. The method of claim 2, The EPC, In connection with the gateway, for the terminal handing over from the area of the first network to the second network area, receiving the target base station information from the gateway, and delivers a Non-Access Stratum (NAS) message to the gateway; MME for delivering a handover request message; A Serving Gateway (S-GW) for managing a service provided to a terminal entering the second network area in association with the gateway; And P-GW (PDN Gateway) for allocating an IP address to the terminal in association with the S-GW Mobile communication system comprising a. The method of claim 4, wherein The gateway, Route and transmit user plane data between the terminal and the S-GW; Performs termination processing of the PDCP layer of the terminal, Performs a radio bearer control function with the terminal, To control the S1 bearer with the S-GW, Manage the terminal moved to the second network area, Process handover for the UE in conjunction with the MME and S-GW, A mobile communication system for delivering a paging message to a terminal located in the second network area. The method of claim 5, The gateway processes the control plane data and the user plane data through interworking with the terminal. The method of claim 4, wherein At least one second network area exists within the first network area, And the terminal performs handover between the first network region and the second network region through the MME. A terminal providing a service to a user through a first network and a second network different from the first network, A first protocol processor that provides an LTE service to a terminal located in a first network area; A second protocol processor that provides a service through a wireless LAN or WiMAX to a terminal located in a second network area; A terminal base station implemented in the terminal and processing a function of interworking with the EPC of the first network through a gateway on the second network; And A management unit for transmitting and receiving a signal for controlling or monitoring the terminal base station Including; The first network area is an LTE area, and the second network area is a wireless LAN or WiMAX area. The method of claim 8, The terminal base station, A Simple Radio Resource Control (SRRC) processing unit interworking with the PDCP processing unit of the first protocol processing unit and the second protocol processing unit and processing a control plane message by controlling radio resources; A data radio bearer (DRB) relay unit which interoperates with a PDCP processor of the first protocol processor and a second protocol processor to relay a user plane message to a gateway forming the second network; In conjunction with the PDCP processing unit of the first protocol processing unit and the second protocol processing unit, when the terminal enters the second network area, the control so that the communication function is turned on to receive a service through a wireless LAN or WiMAX, or from the second network area A terminal base station controller for controlling the communication function to be turned off when entering; And Interface unit for transmitting and receiving a signal for controlling or monitoring the terminal base station with the management unit Terminal comprising a. The method of claim 9, The SRRC processing unit is implemented as an SRRC layer for transmitting and receiving a message through TCP communication, The SRRC layer is a terminal for processing a control plane message required for the remaining functions of the radio management function is removed from the Radio Resource Control (RRC) layer. The method of claim 9, The first protocol processor includes a NAS processor, an RRC processor, a PDCP processor, a Radio Link Control (RLC) processor, a MAC processor, and an LTE PHY processor, The second protocol processing unit includes a PDCP processing unit, a TCP processing unit, a UDP processing unit, an IP processing unit, an LLC / MAC processing unit, and a wireless LAN or WiMAX PHY processing unit. If the terminal is located in the second network area, Control plane message through the NAS processing unit, the RRC processing unit, the SRRC processing unit of the terminal base station, the PDCP processing unit, the TCP processing unit, the IP processing unit, the LLC / MAC processing unit, and the wireless LAN or WiMAX PHY processing unit of the first protocol processing unit. Send and receive, Terminal for transmitting and receiving user plane messages through the PDCP processing unit of the first protocol processing unit, the DRB relay unit of the terminal base station, the UDP processing unit of the second protocol processing unit, the IP processing unit, LLC / MAC processing unit and a wireless LAN or WiMAX PHY processing unit.

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