KR20140148286A - Methods for reporting the connection failure information of a wireless LAN and Apparatuses thereof - Google Patents

Abstract

The present invention relates to a method and apparatus for interworking between a mobile communication network and a wireless LAN of a terminal, and more particularly, to a method and apparatus for a terminal reporting information related to wireless LAN connection with a wireless LAN to a base station. Specifically, the method includes the steps of storing information related to wireless LAN connection including at least one of wireless LAN connection failure information and wireless LAN connection quality information in a method of reporting information related to wireless LAN connection to a base station Transmitting a first signal including indication information on wireless LAN connection related information to a base station, receiving a request signal for requesting wireless LAN connection related information from the base station, and transmitting the wireless LAN connection related information to the base station 2 < / RTI > signal.

Description

[0001] The present invention relates to a wireless LAN access failure information reporting method and apparatus,

The present invention relates to a method and apparatus for interworking between a mobile communication network and a wireless LAN of a terminal, and more particularly, to a method and apparatus for a terminal reporting information related to wireless LAN connection with a wireless LAN to a base station.

As communications systems evolved, consumers, such as businesses and individuals, used a wide variety of wireless terminals. BACKGROUND ART Mobile communication network systems such as LTE (Long Term Evolution) and LTE-Advanced of the current 3GPP series are high-speed and large-capacity communication systems capable of transmitting and receiving various data such as video and wireless data beyond voice- It is required to develop a technology capable of transmitting large-capacity data in accordance with a network. Also, as a plurality of terminals transmit and receive a large amount of data to and from one base station, the data throughput of the base station rapidly increases and the service quality is deteriorated. Therefore, a technique for partially or completely dispersing the data throughput of the base station is required .

Meanwhile, a wireless local area network (WLAN) is a technology for performing data communication using a radio frequency within a predetermined distance around a place where a wireless access point (access point) is installed. As the introduction and dissemination of wireless LANs increase, it is required to develop a technology for distributing data through a mobile communication network to a wireless LAN, thereby reducing the amount of communication in a mobile communication network system and providing high-quality services to users.

As the data traffic of the terminal increases, it is necessary to distribute using the mobile communication network and the wireless LAN network.

However, it is required that the connection switching between the mobile communication network and the wireless LAN should be performed smoothly, and the user is required to have no interruption or problem in data transmission / reception.

In order to solve the above-mentioned demand, when the terminal performs interworking between the base station and the wireless LAN, when the connection with the wireless LAN terminates or fails, it is necessary to report information related to the wireless LAN connection to the base station.

In addition, when the terminal is connected to the wireless LAN, the wireless LAN-related information such as the connection quality information is recorded, and the information is recorded when the terminal is connected or periodically recorded so that the base station can efficiently communicate with the mobile communication network and the wireless LAN coverage It is necessary to provide information for management.

According to an aspect of the present invention, there is provided a method for reporting information related to wireless LAN connection to a base station, the method comprising: receiving a wireless LAN connection request including at least one of wireless LAN connection failure information and wireless LAN connection quality information; Transmitting a first signal including information related to wireless LAN connection related information to a base station, receiving a request signal for requesting wireless LAN connection related information from the base station, And transmitting a second signal including connection related information.

According to another aspect of the present invention, there is provided a method of controlling reporting of information related to a wireless LAN connection of a terminal by a base station, the method comprising: displaying a wireless LAN connection related information including at least one of wireless LAN connection failure information and wireless LAN access quality information Receiving a first signal including information related to a wireless LAN connection, transmitting a request signal requesting wireless LAN connection related information, and receiving a second signal including wireless LAN connection related information.

According to another aspect of the present invention, there is provided a terminal for reporting wireless LAN connection related information to a base station, the terminal including a controller for storing wireless LAN connection related information including at least one of wireless LAN connection failure information and wireless LAN access quality information, A transmitting unit for transmitting a first signal including indication information on wireless LAN connection related information to a base station and transmitting a second signal including information related to wireless LAN connection to a base station, And a receiving unit for receiving the terminal apparatus.

According to another aspect of the present invention, there is provided a base station for controlling reporting of information related to a wireless LAN connection of a terminal, the base station comprising: display information on wireless LAN connection related information including at least one of wireless LAN connection failure information and wireless LAN access quality information; And a transmitter for transmitting a request signal for requesting wireless LAN connection related information, wherein the receiver further comprises a base station device for receiving a second signal including wireless LAN connection related information do.

As described above, according to the present invention, when a terminal performs interworking between a base station and a wireless LAN, when the connection with the wireless LAN terminates or fails, the terminal reports the wireless LAN connection related information to the base station, It is effective to acquire information related to the wireless LAN connection.

In addition, when the terminal is connected to the wireless LAN, the wireless LAN related information such as the connection quality information is recorded, and the information is recorded at the time of connection to the base station or periodically, thereby enabling the base station to efficiently transmit the mobile communication network and the wireless LAN coverage As shown in FIG.

1, An example of a network scenario to which the present invention can be applied FIG.
FIG. 2 is a diagram illustrating an example of a procedure in which a terminal to which the present invention can be applied measures and reports a signal quality.
3 is a diagram illustrating an example in which a UE to which the present invention can be applied performs a RRC connection reset procedure with a base station.
4 is a diagram illustrating an example of an interworking procedure of a terminal to which the present invention can be applied.
5 is a diagram illustrating another example of an interworking procedure of a terminal to which the present invention can be applied.
6 is a diagram illustrating an example in which a terminal of the present invention accesses a wireless LAN and transmits a wireless LAN connection status information message.
7 is a diagram illustrating an example of a procedure for a terminal to transmit information related to wireless LAN connection to a base station according to an embodiment of the present invention.
8 is a diagram illustrating another example of a procedure for a terminal to transmit information related to wireless LAN connection to a base station according to another embodiment of the present invention.
9 is a diagram illustrating an example of a second signal information element including information related to wireless LAN connection transmitted to a base station according to another embodiment of the present invention.
10 is a diagram illustrating an example of an RLF report information element including information related to WLAN connection transmitted to a base station according to another embodiment of the present invention.
11 is a diagram illustrating an example of a first signal information element transmitted from a mobile station to a base station according to another embodiment of the present invention.
12 is a diagram illustrating an example of a request signal information element transmitted to a mobile station by a base station according to another embodiment of the present invention.
13 is a diagram illustrating another example of a second signal information element including information related to WLAN connection transmitted to a base station according to another embodiment of the present invention.
14 is a diagram illustrating an example of a WLAN failure report information element including WLAN connection related information transmitted to a base station according to another embodiment of the present invention.
15 is a view showing another example of information elements that can be further included in a WLAN failure report information element including information related to WLAN connection transmitted to a base station according to another embodiment of the present invention.
16 is a diagram illustrating another example of a procedure for a terminal to transmit information related to wireless LAN connection to a base station according to another embodiment of the present invention.
17 is a diagram illustrating another example of a procedure for a terminal to transmit information related to wireless LAN connection to a base station according to another embodiment of the present invention.
18 is a diagram illustrating an example of a first signal including indication information of a WLAN measurement measurement message according to another embodiment of the present invention.
FIG. 19 is a flowchart illustrating an operation of a terminal according to another embodiment of the present invention.
20 is a flowchart illustrating an operation of a base station according to another embodiment of the present invention.
21 is a diagram illustrating a configuration of a terminal according to another embodiment of the present invention.
22 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a base station (BS, or eNB). The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.

A base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.

That is, the base station or the cell in this specification is interpreted as a comprehensive meaning indicating a partial region or function covered by BSC (Base Station Controller) in CDMA, NodeB in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.

Herein, the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in this specification, and are not limited by a specific term or word. The user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-Advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In systems such as LTE and LTE-Advanced, the uplink and downlink are configured on the basis of one carrier or carrier pair to form a standard. The uplink and the downlink are divided into a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel, a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH) Transmits control information through the same control channel, and is configured with data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel), and transmits data.

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

The wireless communication system to which the embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-point transmission / reception system in which two or more transmission / reception points cooperatively transmit signals. antenna transmission system, or a cooperative multi-cell communication system. A CoMP system may include at least two multipoint transmit and receive points and terminals.

The multi-point transmission / reception point includes a base station or a macro cell (hereinafter referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >

Hereinafter, a downlink refers to a communication or communication path from a multipoint transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiple transmission / reception point. In the downlink, a transmitter may be a part of a multipoint transmission / reception point, and a receiver may be a part of a terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH and PDSCH are transmitted and received'.

The eNB performs downlink transmission to the UEs. The eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of a PDSCH, A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

1 is a diagram illustrating an example of a network scenario to which the present invention can be applied.

Interworking is a method in which a terminal distributes a part or all of data through a wireless LAN (WLAN) and a base station in a network environment in which a base station of a mobile communication network and a WLAN AP are overlapped . That is, a terminal in communication with the base station moves some or all of the data traffic to the wireless LAN, or a terminal in communication with the wireless LAN processes some or all of the data traffic to the base station.

Referring to FIG. 1, there are several scenarios depending on the relationship between the operator who manages the mobile communication network and the operator who manages and operates the AP 120 of the WLAN.

That is, when the operator of the mobile communication network operates the AP 120 of the WLAN, information is not exchanged between the two networks, but a certain level of integration is performed between the 3GPP CN (Core Node) and the WLAN network , There is a method of performing authentication using SIM (Subscriber Identification Module) information or the like as an embodiment thereof.

In addition, an operator of a mobile communication network can contract with a provider that provides WLAN service so that mobile communication subscribers can use the WLAN. In this case, integration between the 3GPP CN (Core Node) and the WLAN network can be selectively implemented, and information is not exchanged between the two networks.

In addition, the same operator may provide a service combining a base station and a WLAN. In this case, there is a certain level of integration between the 3GPP CN (Core Node) and the WLAN network. Information can also be exchanged between these two networks. This can be performed using a predetermined interface. This scheme can be considered as a combination between the WLAN and the home base station (Home eNB, HeNB).

The operator may also off-load possible data traffic to the WLAN to avoid loading the macrocell.

Alternatively, data traffic may be offloaded to a WLAN in a hotspot area while maintaining communication quality on the user side.

On the other hand, in the above cases, the subject may be different or the same. There may be a situation where mobile communication and WLAN coexist within a certain area in a state where a predetermined contract is established between them. In this case, it is necessary to provide a way for the user terminal to access the network more efficiently. That is, a technique for efficiently selecting a network is required.

That is, a method of efficiently selecting whether the terminal 121 is connected to the mobile communication base station 110 to perform communication through the mobile communication network or to be connected to the WLAN AP 120 and perform communication via the WLAN Is required.

For example, the terminal 122 outside the coverage of the WLAN among the terminals 121 and 122 belonging to the service area of the base station 110 transmits and receives data with the base station 110, and the terminal 121, which is within the coverage of the WLAN, Lt; RTI ID = 0.0 > 110 < / RTI > At this time, the terminal 121 may terminate the communication with the base station 110, transmit / receive data through the WLAN AP 120, or process only a part of data traffic through the WLAN AP 120. And vice versa, may communicate with the WLAN AP 120 and process some or all of the data traffic through the base station 110. This has the effect of reducing data load of the base station 110 and distributing data traffic in an area such as a hot spot and providing the user with a pleasant communication environment.

In mobile communication systems, support for mobility of a terminal is essential. In order to support mobility, the UE continuously measures the signal quality of the serving cell currently serving and the neighboring cells neighboring the serving cell. The measured result is transmitted to the base station under a special condition, and the base station supports the mobility of the mobile station in a manner of instructing the mobile station to hand over to the neighboring cell based on the measurement result reported by the mobile station.

If the UE supports measurements on a heterogeneous network, measurements may be made on the cells of a heterogeneous network by setting up a base station. Such measurements on a heterogeneous network are referred to as inter-RAT (Radio Access Technology) measurements. Here, the RAT may include a UTRAN (UMTS Terrestrial Radio Access Network), a GERAN (GSM EDGE Radio Access Network) conforming to the 3GPP standard, and may also include a CDMA 2000 system conforming to the 3GPP2 standard.

FIG. 2 is a diagram illustrating an example of a procedure in which a terminal to which the present invention can be applied measures and reports a signal quality.

In performing interworking between a base station of a mobile communication network and a WLAN, for example, the terminal measures the signal quality of the WLAN and performs interworking according to the result.

Referring to FIG. 2, the terminal 209 receives measurement configuration information set by the base station 201 (S210). The terminal 209 determines an object to be measured based on measurement configuration information received from the base station 201 and performs measurement (S220). Here, the measurement object may be the signal quality of the WLAN which is a heterogeneous network.

The terminal 209 may transmit the measurement report including the measured signal quality information and the WLAN information to the base station 201 (S230). That is, the terminal 209 receiving the message including the measurement configuration information performs the signal quality measurement of the heterogeneous network and reports the measurement result.

For example, the measurement configuration information that the base station 201 transmits to the terminal 209 may include the following parameters.

- Measurement objects: Contains information about the object of the signal quality to be measured by the terminal. Each of the measurement objects set in the terminal may be one of an intra-frequency measurement object, an inter-frequency measurement object, or an inter-RAT measurement object. For intra-frequency and inter-frequency measurements, the measurement target is one LTE carrier frequency.

Reporting configuration: Includes configuration information about when to report to the base station about the measurement result of the terminal. As an example, it can be set to periodically report the measured result. Alternatively, the terminal may be configured to determine the occurrence of a specific event and report the occurrence of a specific event.

Measurement identities: Include ID information that links a specific measurement object to a specific reporting configuration.

- Quantity configurations: Includes configuration information for filtering measurement quantities and measurement results.

- Measurement gaps: The measurement gaps include information on the time allocated to the terminal so that the terminal can only measure the signal quality without transmitting and receiving data of the terminal. Inter-frequency, inter-RAT measurement operations can be performed during this period.

At least one parameter among the parameters described above may be included in the measurement configuration information and transmitted to the terminal.

The terminal 209 reports the measurement result based on the measurement configuration information based on the reporting configuration information of the measurement configuration (S230). The reporting operation of the terminal 209 can be performed periodically or according to the occurrence of an event.

As an example, an event that triggers a reporting operation of the terminal may be defined as follows.

Event A1: If the quality of the measured serving cell is better than a certain threshold, the UE transmits the measurement result to the base station. Here, a specific threshold may be preset through measurement configuration information. Alternatively, it may be a value stored in advance in the terminal.

Event A2: If the quality of the measured serving cell is worse than a certain threshold, the UE transmits the measurement result to the base station. Here, a specific threshold may be preset through measurement configuration information. Alternatively, it may be a value stored in advance in the terminal.

Event A3: If the quality of the neighboring cell measured is better than the offset value of the serving cell, the terminal transmits the measurement result to the base station. The offset value may be preset through the measurement configuration information. Alternatively, it may be a value stored in advance in the terminal.

Event A4: If the quality of the measured neighboring cell is better than a certain threshold, the terminal transmits the measurement result to the base station. Here, a specific threshold may be preset through measurement configuration information. Alternatively, it may be a value stored in advance in the terminal.

Event A5: If the quality of the measured serving cell is worse than the threshold 1 and the quality of the neighboring cell is better than the threshold 2, the UE transmits the measurement result to the base station. Specific values 1 and 2 (thresholds 1 and 2) can be preset through measurement configuration information. Alternatively, it may be a value stored in advance in the terminal.

Event A6: If the quality of the measured neighboring cell is better than the offset of the quality of SCell, the terminal transmits the measurement result to the base station. The offset value can be preset through the measurement configuration information. Alternatively, it may be a value stored in advance in the terminal.

Event B1: If the quality of the measured Inter RAT neighbor cell is better than a certain threshold, the terminal transmits the measurement result to the base station. The specific threshold can be preset through the measurement configuration information. Alternatively, it may be a value stored in advance in the terminal.

Event B2: If the measured quality of the serving cell is worse than the threshold 1 and the quality of the Inter RAT neighbor cell is better than the threshold 2, the UE transmits the measurement result to the base station. Specific values 1 and 2 (thresholds 1 and 2) can be preset through measurement configuration information. Alternatively, it may be a value stored in advance in the terminal.

Meanwhile, the MS can perform an RRC connection re-establishment procedure to solve a problem in a wireless connection with a BS.

Hereinafter, a specific procedure and method for performing the RRC connection re-establishment procedure with the base station of the present invention will be described with reference to the drawings.

3 is a diagram illustrating an example of an RRC connection reset procedure to which the present invention can be applied.

The RRC connection re-establishment procedure is a process for solving a problem and restoring a connection with a base station when a terminal having an RRC connection state has a problem in wireless connection with the base station.

Referring to FIG. 3, the UE 309 detects that a problem with a radio connection with the BS 301 has occurred, and transmits a request message for RRC connection re-establishment to the BS 301 (S310).

For example, the terminal 309 performs an RRC connection re-establishment procedure with the base station when the following situation occurs.

- When a Radio Link Failure (RLF) is detected: The terminal can perform the RRC connection reset procedure with the base station for RLF processing when the RLF is detected on the radio link with the base station.

When a handover failure occurs: When a handover is performed from one base station to a target base station, the UE may recover the handover failure and perform an RRC connection re-establishment procedure to perform communication .

- Mobility Failure from Evolved Universal Terrestrial Radio Access (E-UTRA): If the mobile terminal fails to move to another RAT, it can perform the RRC connection reset procedure to recover it and resume communication.

- When integrity check failure occurs from the PDCP (Packet Data Convergence Protocol) layer: The UE can perform the RRC connection re-establishment procedure when the integrity check failure is detected from the PDCP layer.

When the RRC connection reconfiguration process fails: The UE can perform the RRC connection reconfiguration procedure to recover the communication failure and to resume communication when a failure occurs during the reconfiguration of the RRC connection with the base station.

The terminal 309 transmits an RRC connection re-establishment request message to the base station 301 when any one of the above cases occurs (S310).

Then, the base station 301 transmits an RRC connection re-establishment message to the terminal 309 (S320), and proceeds to the RRC connection re-establishment procedure.

For example, in performing the RRC connection re-establishment procedure, the terminal 309 does not enter the RRC idle state. Therefore, it does not initialize all connection settings (for example, radio bearer setting, etc.). Instead, the UE 309 suspends another radio bearer except the Signaling Radio Bearer 0 (SRB0) when starting the RRC connection reset process. Thereafter, if the RRC connection reconfiguration process is successful, the UE resumes use of the discontinued radio bearers.

When the RRC connection re-establishment procedure is completed, the terminal 309 transmits a completion message to the base station 301 (S330).

Meanwhile, the operator of the mobile communication network needs to collect the coverage of the cell provided by each base station and the signal quality information at a specific point, and to optimize each base station coverage and deployed base station coverage.

For this purpose, the signal quality of a specific point can be measured through Minimization of Drive Test (MDT).

Specifically, there was a drive test in which a carrier measures the quality of a cell using a car for conventional coverage optimization. MDT aims at minimizing the time and cost of optimizing the coverage by measuring the cell quality and reporting the results using the terminals of the users existing in the sal instead of the drive test. Because coverage varies with changes in the surrounding environment, operators must periodically measure and manage coverage through drive testing. This results in additional time and cost requirements. Therefore, in order to reduce the time and cost, the MDT is used by the mobile station to perform cell coverage optimization by allowing the mobile station to measure and report the cell quality.

MDT can be divided into logged MDT and immediate MDT. Logged MDT means that the terminal performs MDT operation in the RRC idle state. When the UE performs the cell quality measurement in the RRC idle state and stores the result, when the UE goes to the RRC connected mode, it reports the stored MDT record to the network.

On the other hand, the Immediate MDT performs an MDT operation in the RRC connected mode. In the RRC connected mode, the UE performs the cell quality measurement. If the reporting condition is satisfied, .

In general, coverage of a mobile communication network (e. G., LTE or UMTS) can be optimized through techniques such as MDT and SON (Self Organizing Network).

However, there is no optimization work in the case of the terminal switching the connection between the mobile communication network and the wireless LAN, such as a movement from a wireless LAN (WLAN) or a wireless LAN to a mobile communication network in a mobile communication network (for example, LTE) It is not true. Therefore, when there is a problem in connection switching between the WLAN and the LTE due to a change in the surrounding environment, there is a problem that a large amount of time and cost are required to periodically perform a drive test using the vehicle .

In order to solve such a problem, the present invention proposes a procedure for recording a problem and reporting the problem to a base station when a problem occurs in connection switching between LTE and WLAN. Thus, the base station can efficiently manage a mobile communication network (e.g., LTE) and wireless LAN (WLAN) coverage.

Hereinafter, an interworking (WLAN / 3GPP Radio inter-working) procedure between a wireless LAN (WLAN) and a mobile communication network to which the present invention is applied will be described in further detail.

4 is a diagram illustrating an example of an interworking procedure of a terminal to which the present invention can be applied.

Referring to FIG. 4, the terminal 409 receives parameter information used in performing interworking from the mobile communication network base station 401 (S410). The parameter information may include at least one of measurement information, radio access network (RAN) rule information, policy information, and access network discovery and selection function (ANDSF) information required for signal quality measurement .

The terminal 409 determines and performs interworking with the WLAN based on the received parameter information, the RAN rule, and the ANDSF information (S420). For example, the terminal 409 may measure the signal quality of the WLAN and determine interworking with the WLAN if the measured signal quality is greater than or equal to a reference value and the measured signal quality of the measured base station is less than another reference value. Alternatively, even when the terminal 409 is connected to the WLAN AP 402, the interworking with the base station 401 can be determined based on the measurement result of the signal quality and the RAN rule or the like.

For example, when the terminal 409 succeeds in performing interworking for processing some or all of the traffic communicating with the base station 401 through the WLAN, the terminal 409 transmits some or all of the data traffic to the WLAN AP 402 (S430).

In FIG. 4, the terminal 409 decides to determine off-loading, but the present invention is not limited thereto. Thus, Fig. 5 illustrates an example of another scenario of interworking to which the present invention may be applied.

5 is a diagram illustrating another example of an interworking procedure of a terminal to which the present invention can be applied.

In the scenario of FIG. 5, the terminal 509 receives the measurement control information from the base station 501 and transmits the measurement result to the base station 501. The base station 501 controls the interworking of the terminal 509.

Referring to FIG. 5, a step of offloading the terminal 509 to the WLAN AP 502 will be described in detail. It should be noted that the terminal 509 may be offloaded from the WLAN AP 502 to the base station 501 only if the terminal 509 offloads the WLAN AP 502 to the WLAN AP 502, The present invention can also be applied.

The terminal 509 receives measurement control information from the base station 501 (S510). The measurement control information may include all of the measurement configuration information described with reference to FIG. 2, and may include RAN rule information and information transmitted from the ANDSF. Also, the measurement control information may be included in the MeasConfig information element of the existing RRC reconfiguration message or may be composed of a new information element.

The terminal 509 measures the WLAN frequency and the signal quality of the base station based on the received measurement control information (S520). That is, the signal quality measurement operation described with reference to FIG. 2, for example, can be performed.

The terminal 509 determines whether to report the measurement result in consideration of the signal quality measurement result and the event condition included in the information transmitted from the RAN rule or the ANDSF (S530).

As described above, the measurement control information may include measurement configuration information for measuring quality of signals of the WLAN and the base station.

Specifically, for example, the measurement control information transmitted by the base station 501 to the terminal 509 includes the following information.

- WLAN frequency information: Contains information related to the WLAN frequency (channel) to be measured.

- SSID (Service Set Identifier) information: Includes the SSID information of the WLAN to be measured.

- Report setting information: Includes setting information about when the terminal should report to the base station about the result of measuring the WLAN frequency.

- WLAN location information: Contains information related to the location of the WLAN APs.

- Beacon message information: Includes the period and timing information of the beacon message transmitted by the corresponding WLAN AP. For example, the terminal can receive a beacon message directly from the WLAN AP by scanning the WLAN frequency at the correct time through the corresponding beacon message information, thereby minimizing the scan time of the WLAN frequency.

Specifically, for example, the report setting information included in the measurement control information or the measurement configuration information may include report period information of the measurement result and event information as follows.

- If the measured WLAN quality is above a certain threshold, the terminal transmits the measurement result to the base station. The specific threshold may be set through the report setting information, or may be a value stored in advance in the terminal.

- If the measured WLAN quality is better than the offset value of the current serving cell quality, the terminal transmits the measurement result to the base station. The offset value may be set through the report setting information or may be a value stored in advance in the terminal.

If the quality of the measured serving cell is worse than the threshold 1 and the WLAN quality is better than the threshold 2, the UE transmits the measurement result to the base station. The specific values 1 and 2 (thresholds 1 and 2) may be set through the report setting information or may be a value pre-stored in the terminal.

The terminal 509 determines whether or not a report event is triggered based on the information described above (S530). When an event reporting the measurement result to the base station 501 is triggered based on the measured signal quality of the base station and the WLAN and the report setting information, the terminal 509 transmits a measurement report (measurement report) (S540).

The base station 501 determines the WLAN connection of the terminal 509 based on the measurement report received from the terminal 509 and transmits a control command signal to the terminal 509 to instruct the connection to the WLAN (S550). The control command signal may include a WLAN access request message.

In addition, the WLAN access request message included in the control command signal transmitted from the base station 501 to the terminal 509 includes information necessary for connection such as channel information of the WLAN, SSID value, encryption method, WEP-Key, (SSID, signal strength, location, channel load information, etc.).

The content to be reported can be obtained by receiving a beacon message or a probe response message in a WLAN scanning process. The WLAN access request message may request to communicate with the WLAN for the entire traffic or specific traffic of the corresponding terminal. When the specific traffic is moved to the WLAN, the unit may be a radio bearer unit. That is, by including drb-identity or eps-bearerIdentity in the WLAN access request message, the mobile terminal can request the terminal to transmit the data communicated to the DRB (Data Radio Bearer) through the WLAN. When moving a plurality of DRBs to WLAN, a list of drb-identities may be included.

As another example, a request to communicate with the WLAN for the above-described traffic may first be provided after a WLAN Access Request message is sent to the terminal, and a message is received from the terminal indicating successful access to the WLAN. That is, a WLAN access request and a traffic WLAN movement request of a radio bearer unit can be provided in two steps. That is, the base station may request a traffic movement after the terminal succeeds in the WLAN connection.

As another example, the WLAN connection access request message may include information indicating whether the terminal has previously transmitted WLAN support (for example, information such as 2.4 GHz or 5 GHz, 802.11a / b / g / n and the like) , Terminal battery information, etc.), only the information about the WLAN system that can be supported by the terminal can be transmitted.

As another example, the WLAN connection state information may include WLAN signal strength, WLAN channel load information, number of terminals accessing the WLAN, terminal location information such as a WLAN signal strength obtained by receiving a beacon message of a WLAN, a probe response message, Information, and throughput information.

The terminal 509 may cause the WLAN AP 502 to process all or some of the data traffic of the base station based on the control command signal of the base station 501 (S560). That is, data traffic can be controlled and transmitted / received through a wireless LAN.

6 is a diagram illustrating an example in which a terminal of the present invention accesses a wireless LAN and transmits a wireless LAN connection status information message.

If the off-loading procedure is successful with the WLAN of the MS as described above, the MS may transmit a message including information on the connection state with the WLAN to the BS.

Referring to FIG. 6, the process of offloading data traffic to the WLAN by the terminal 609 and transmitting the connection state information when the offloading is successful will be described in detail.

The base station 601 transmits a WLAN access request message to the terminal 609. The WLAN access request message may be transmitted according to a measurement result report on the WLAN frequency previously transmitted by the terminal 609. [

The WLAN access request message may be an RRC Connection Reconfiguration message, a RRC Connection Release, or a new RRC message. The above-mentioned RRC messages may include priority information by WLAN system (for example, type information such as 802.11a / b / g / n) or WLAN channel (frequency). The priority information allows the terminal 609 to select and access the WLAN system according to the priority information when the terminal 609 accesses the WLAN in the IDLE state. It is assumed that the terminal 609 receives the control command of the base station 601 and performs the interworking. However, as described above, the terminal 609 receives the control command from the base station 601 based on the parameter information received from the base station 601, You may decide to work. In this case as well, the present invention can be similarly applied.

The terminal 609 attempts to access the WLAN according to the received WLAN connection request message (S610). For example, the terminal 609 may attempt to connect to the WLAN AP 602 for some or all of the data traffic (S610).

When the terminal 609 successfully accesses the WLAN (S620), the terminal 609 reports the WLAN connection status related information to the base station (e.g., the LTE base station 601) (S630, S640, S650).

The transmission of the WLAN connection status information message may be established by a previously received WLAN connection request message or may be established by a previously set measurement control information or measurement configuration information message.

The WLAN connection status information message may be repeatedly transmitted over a plurality of times when the terminal 609 is connected to the WLAN. As an example, the WLAN connection status information message may be transmitted periodically, and may be transmitted based on a specific situation. The WLAN connection status information message may include at least one of WLAN signal strength, WLAN channel load information, terminal location / speed information, and throughput information.

If the quality status of the WLAN is higher than a threshold value, the BS 601 transmits an RRC Connection Release message to the UE 609 to control the UE in an IDLE state .

The terminal 609 can establish an RRC connection with the LTE / UMTS base station again if the following specific conditions are satisfied.

For example, the terminal 609 may establish an RRC connection with the base station and transmit and receive data through the base station if the following case occurs.

If the quality of the WLAN is less than the reference value, the UE measures the signal quality of the WLAN and can perform interworking with the base station again if the signal quality is below the reference value. For example, the UE receives the Received Channel Power Indicator (RCPI) ), An RSNI (Received Signal to Noise Indicator), and the like.

- When the terminal moves to a certain speed value or more: When the terminal moves at a high speed based on a parameter value indicating the moving speed of the terminal, interworking can be performed to the base station for stable data communication of the terminal. For example, if the state value of the mobility state information of the UE is in a high mobility state, the RRC connection with the base station can be established and communication can be resumed.

- If the load of the WLAN is greater than the threshold value: If the load of the WLAN increases above a certain reference value according to the load of the WLAN, the terminal resumes the RRC connection with the base station for data communication through the base station .

The base station 601 may determine whether to off-load the terminal 609 back to the mobile communication network based on the WLAN connection status information message described above.

As described with reference to FIGS. 1 to 6, the terminal and the base station of the present invention can perform communication by performing interworking in various ways.

Hereinafter, embodiments in which a terminal of the present invention reports wireless LAN connection related information including information related to connection to a wireless LAN to a base station so that the base station can perform coverage optimization will be described.

First Embodiment: A method for transmitting wireless LAN connection related information including a wireless LAN connection failure or termination information when a terminal fails to connect to a wireless LAN or a connection to a wireless LAN is terminated.

The terminal records the information of the moment when the wireless LAN connection fails or the connection is disconnected during the connection. Thereafter, the terminal transmits the information stored when the terminal is connected to the mobile communication network (for example, LTE) to the base station.

7 is a diagram illustrating an example of a procedure for a terminal to transmit information related to wireless LAN connection to a base station according to an embodiment of the present invention.

Referring to FIG. 7, the terminal 709 may attempt to access the wireless LAN. Or may attempt to access the wireless LAN and be connected.

When the terminal 709 fails to connect with the WLAN AP 702 or when the connection is terminated (S710), the wireless LAN connection related information is stored (S720).

For example, the WLAN access-related information includes location information (locationInfo-r10) of a failed connection (or disconnected), a WLAN AP service set identifier (SSID) to which the terminal last connected, a basic service set identifier (BSSID) (LTE Cell ID and frequency information), information on one or more LTE cell IDs and frequency information (or WLAN AP SSID and WLAN channel information) ), The quality information (RSSI (Received Signal Power Indicator), RSNI (Received Signal to Noise Indicator), RSRP / RRSQ) of each cell or AP, neighbor AP information (Access Point SSID, quality information, (Cell ID, quality information, location information, etc.), WLAN Load information, period of time when the connection is disconnected, and absolute time information. And may further include various information for wireless LAN access, wireless LAN coverage, and mobile communication network coverage verification. Hereinafter, the WLAN AP SSID information in this specification may be used to mean one or more of the SSID, BSSID, and HESSID described above.

The terminal 709 transmits a first signal including indication information indicating that the wireless LAN connection related information is held to the base station 701 (S730).

Upon receiving the first signal from the terminal 709, the base station 701 can transmit a request signal for requesting the wireless LAN connection related information stored in the terminal 709 (S740).

The terminal 709 may transmit the second signal including the wireless LAN connection related information stored in the base station 701 (S750).

For example, the first signal may be one of an RRC connection setup complete message, an RRC connection reconfiguration complete message, an RRC connection reset complete message, and an RRC connection setup complete message. Also, for example, the second signal may be an RLF report, a WLAN failure report.

Hereinafter, the operations of the terminal and the base station according to the first embodiment of the present invention will be described in detail with reference to the drawings, by way of example, with respect to the first signal, the second signal, and the request signal.

Example 1-1; A method for including information related to a wireless LAN connection in an RLF report (Radio Link Failure Report) .

8 is a diagram illustrating another example of a procedure for a terminal to transmit information related to wireless LAN connection to a base station according to another embodiment of the present invention.

Referring to FIG. 8, a terminal 809 according to another embodiment of the present invention may attempt to access a WLAN AP 802. Or may be in connection with the WLAN AP 802.

If the terminal 809 fails to connect to the WLAN AP 802 (S810), the terminal 809 can store the wireless LAN connection related information at the time of the failure occurrence (S820). As another example, when the connection with the wireless LAN is terminated (S810), the terminal 809 can store the wireless LAN connection related information at the end point (S820). Hereinafter, the case where the terminal 809 attempts to connect to the wireless LAN but fails, and the case where the terminal 809 has performed connection with the wireless LAN but the connection is terminated, is referred to as a wireless LAN connection failure. Therefore, the wireless LAN connection failure in this specification should be construed to mean both the failure of the wireless LAN connection attempt of the terminal 809 and the termination of the connection.

The terminal 809 performs an RRC connection procedure with the base station 801 when a connection failure with the wireless LAN occurs. For example, the terminal 809 may transmit an RRC connection request message to the base station 801 (S830). The base station 801 may transmit an RRC connection setup message including information necessary for establishing an RRC connection with the terminal 809 (S850).

The terminal 809 performs an RRC connection procedure with the base station 801, and may transmit an RRC Connection Setup Complete message when the RRC connection procedure is completed (S850). In this case, the terminal 809 can transmit the first signal including the indication information indicating that it has the wireless LAN connection related information to the base station 801.

For example, if the UE 809 stores WLAN connection related information including information on the failure of the WLAN connection, the UE 809 sets the RLF-InfoAvailable field of the RRC connection setup complete message to true, Lt; / RTI > As another example, the terminal 809 may transmit the RRC-Connection Reconfiguration Complete message to the base station 801 by setting the RLF-InfoAvailable field to true. As another example, the terminal 809 may transmit the RLC-Connection Reestablishment Complete message to the base station 801 by setting the RLF-InfoAvailable field to true in the RRC Connection Reestablishment Complete message. That is, the first signal illustrated in FIG. 7 may be any one of an RRC connection setup complete message, an RRC connection reconfiguration complete message, an RRC connection reset complete message, and an RRC connection setup complete message. As another example, the terminal 809 may transmit an indication message that it is storing the WLAN connection related information using the connEstFailInfoAvailable field instead of the RLF-InfoAvailable field. As another example, the terminal 809 may define and use a new field for WLAN connection failure.

The base station 801 receiving the display information from the terminal 809 transmits a request signal for requesting the wireless LAN connection related information (S860). For example, the request signal may be a UE Information Request message. That is, the base station 801 can request the RLF report including the wireless LAN connection related information based on the display information.

The terminal 809 can receive the request signal from the base station 801 and transmit the RLF report including the wireless LAN connection related information. For example, in transmitting the RLF report including the WLAN connection related information, the UE 809 may transmit a UE Information Response message including the RLF report field (S870).

9 is a diagram illustrating an example of a second signal information element including information related to wireless LAN connection transmitted to a base station according to another embodiment of the present invention.

Referring to FIG. 9, for example, the terminal can transmit an RLF report to a second signal including information related to wireless LAN connection according to a request signal of a base station. The RLF report may be transmitted in the UE Information Response message 900.

Specifically, for example, the terminal can receive a request signal including information requesting wireless LAN connection related information from the base station. For example, the request signal may be a terminal information request message.

The terminal receives the request signal from the base station and transmits the RLF report-related information storing the related information at the time of the failure of the wireless LAN connection to the base station by including it in the RLF report. For example, as shown in FIG. 9, the RLF report may be included in the terminal information request message 900 and transmitted. Or may be included in a new message that is not a terminal information request message, for example.

10 is a diagram illustrating an example of an RLF report information element including information related to WLAN connection transmitted to a base station according to another embodiment of the present invention.

The above-described RLF report 1000 may include information related to wireless LAN connection. For example, referring to FIG. 10, the RLF report 1000 may include the following information.

For example, the RLF report 1000 includes information on a terminal location (locationInfo-r10) when a terminal has failed to connect, event (or rule) information (e.g., a WLAN connection rule, the WLAN channel information (or the LTE cell ID and frequency information), the WLAN connection information, and the WLAN access information, (WLAN AP SSID and WLAN channel information), quality information of each cell or AP (Received Channel Power Indicator (RSSI), Received Signal to Noise Indicator (RSNI), RSRP / RRSQ At least one of neighbor AP information (AP SSID, quality information, location information), neighbor cell information (Cell ID, quality information, location information, etc.), WLAN load information, The above information may be included.

That is, the UE can transmit the RLF report field including the WLAN connection related information in the RLF report field in the UE information request message as shown in FIG. 9 and FIG.

In the foregoing, the case where the wireless LAN connection related information according to the 1-1th embodiment of the present invention is included in the RLF report and transmitted is described with reference to the drawings. Hereinafter, the case where the WLAN connection related information of the present invention is transmitted in a new field will be described.

Embodiment 1-2: A method in which WLAN connection related information is included in a WLAN Failure Report and transmitted.

As described with reference to FIG. 8, if the wireless LAN connection failure occurs, the terminal stores the wireless LAN connection related information. The terminal then performs an RRC connection procedure to perform communication with the base station.

For example, the terminal transmits an RRC connection request message to the base station and receives an RRC connection setup message including information necessary for the RRC connection.

The UE can complete the RRC connection procedure with the base station and transmit the RRC connection setup complete message.

If the terminal includes wireless LAN connection related information including information on the failure of the wireless LAN connection, the terminal may transmit indication information indicating that wireless LAN connection related information is stored in the RRC connection setup complete message have. For example, if the terminal has wireless LAN connection related information, the terminal can transmit a first signal including indication information indicating that the wireless LAN connection related information is stored in the RRC Connection Setup Complete message have. As an example, the indication information may be communicated by sending a new wLANFailure-Info field to the base station with set to true. In another example, the terminal may be communicated with indication information using an existing RLF-InfoAvailable field. As another example, the terminal may use the connEstFailInfoAvailable field. As another example, the terminal may use the existing RLF-InfoAvailable field and the connEstFailInfoAvailable field. As another example, the indication information may be included in the RRC Connection Reconfiguration Complete message or the RRC Connection Reset Complete message or the RRC Connection Establishment Complete message.

The base station receiving the message can transmit the request information including the request for the wireless LAN connection related information stored in the terminal information request message to the terminal. The terminal may transmit a second signal including information related to wireless LAN connection based on the request signal received from the base station. For example, WLAN connection related information may be included in a WLAN failure report and transmitted.

11 is a diagram illustrating an example of a first signal information element transmitted from a mobile station to a base station according to another embodiment of the present invention.

11, the UE may complete the RRC connection procedure with the base station and may transmit the RRC connection setup complete message 1100. FIG.

For example, the RRC connection setup complete message 1100 may include indication information indicating that the terminal is storing WLAN connection related information. Specifically, the UE may transmit the WLANFailure-InfoAvailable field to the RRC connection setup complete message 1100 as shown in FIG. If the value of the wLANFailure-InfoAvailable field is set to true, it can indicate that wireless LAN connection related information including information related to the wireless LAN connection failure is stored. The display information may be included in the RRC Connection Reconfiguration Complete message or the RRC Connection Reestablishment Complete message or the RRC Connection Establishment Complete message as described above.

12 is a diagram illustrating an example of a request signal information element transmitted to a mobile station by a base station according to another embodiment of the present invention.

Referring to FIG. 12, for example, the BS may transmit a request signal for requesting a WLAN failure report including information related to the WLAN connection to the MS. In one example, the request signal may be a UE Information Request message 1200.

For example, the terminal information request message 1200 may include a wLANFailReportReq field. If the wLANFailReportReq field is set to true, the UE can recognize that the base station requests the wireless LAN connection related information.

When the UE receives the WLANFailReportReq field set to true, it can transmit the WLAN-related connection information stored in the base station. In this case, the terminal may transmit the WLAN connection related information to the WLAN failure report.

13 is a diagram illustrating another example of a second signal information element including information related to WLAN connection transmitted to a base station according to another embodiment of the present invention.

Referring to FIG. 13, a WLAN failure report including WLAN connection related information may be included in the terminal information response message 1300 and transmitted. For example, according to another embodiment of the present invention, the WLAN connection related information may be included in the WLAN failure report and transmitted. The WLAN failure report may refer to a report newly defined to transmit wireless LAN connection related information including related information when a wireless LAN connection failure occurs. That is, although the 1-1 RLF report includes the WLAN connection related information in the existing RLF report, a new report for transmitting the WLAN connection related information can be defined in this embodiment. Here, the newly defined report is described as an example of a WLAN failure report.

The terminal information response message 1300 may include a wLANFailReport field including wireless LAN connection related information. Accordingly, the UE receives the request signal for the WLAN connection related information from the BS, and transmits the WLANFailReport field including the corresponding information.

14 is a diagram illustrating an example of a WLAN failure report information element including WLAN connection related information transmitted to a base station according to another embodiment of the present invention.

Referring to FIG. 14, the WLAN failure report 1400 may include WLAN connection related information including related information when a WLAN access failure occurs.

Specifically, for example, the WLAN Failure Report 1400 may include the following information. That is, the terminal information response message including the WLAN failure report field 1400 may include the following information.

For example, the WLAN failure report 1400 may include information on location (locationInfo-r10) of a terminal, event (or rule) information (e.g., a WLAN connection rule, (Or a reference value of a rule), WLAN AP SSID, BSSID, and Homogeneous Extended Service Set Identifier (HESSID), WLAN channel information (or LTE Cell ID and frequency information) (Received Signal Power Indicator), RSNI (Received Signal to Noise Indicator), and RSRP / RSNP information for each cell or AP of the base station. RRSQ), neighboring AP information (AP SSID, quality information, location information), neighboring cell information (Cell ID, quality information, location information, etc.), WLAN load information, And may include one or more pieces of information. Or may further include information such as a wireless LAN state and a mobile communication state when a wireless LAN connection failure occurs.

15 is a view showing another example of information elements that can be further included in a WLAN failure report information element including information related to WLAN connection transmitted to a base station according to another embodiment of the present invention.

Referring to FIG. 15, the WLAN failure report 1500 may include the WLAN connection related information described above. As shown in FIG. 15, the WLAN failure report 1500 may include information related to the mobile communication network. Alternatively, the WLAN failure report may further include information elements associated with the mobile communication network and / or the WLAN.

As described above, the WLAN failure report may include wireless LAN connection related information. For example, the information related to the WLAN connection includes information related to the signal quality of each cell of the WLAN or the mobile communication network and the WLAN connection. In addition, it may include information related to the failure of the wireless LAN connection such as information for identifying the wireless LAN and the number of terminals connected to the wireless LAN. Some of the information that can be included in the wireless LAN connection related information is shown in Table 1 below.

As described above, the UE stores information related to the WLAN connection and transmits the information to the BS when the WLAN access attempt fails or the connection with the WLAN is terminated. Through this, the base station can acquire information related to the wireless LAN connection, and can perform a mobile communication network coverage optimization operation considering the signal quality and coverage of the wireless LAN.

However, the method described in the above-described embodiment transmits information related to the wireless LAN connection when the wireless LAN connection attempt fails or when the connection with the wireless LAN is terminated. Therefore, even when the terminal is connected to the wireless LAN AP and is performing communication, it is necessary to store and transmit wireless LAN connection-related information.

Hereinafter, a method of storing the above-described WLAN-related information and transmitting the WLAN-related information to the base station when the terminal is performing communication via the wireless LAN according to another embodiment of the present invention will be described.

Second Embodiment: A method in which a terminal records wireless LAN connection related information including wireless LAN connection quality information while accessing a wireless LAN, and transmits the information to the base station (Logged WLAN measurement).

A terminal according to another embodiment of the present invention can access a wireless LAN by attempting to access the wireless LAN. The terminal can measure the signal quality of the wireless LAN or the neighboring wireless LAN while accessing the wireless LAN. In addition, the terminal can store / record the wireless LAN connection quality information including the measured signal quality result. When the terminal accesses the mobile communication network, the terminal can transmit the wireless LAN connection related information including the wireless LAN connection quality information to the base station. Accordingly, the base station can acquire connection-related information in the case where the terminal fails to connect to the wireless LAN, and when the terminal is connected to the wireless LAN and normally performs communication.

16 is a diagram illustrating another example of a procedure for a terminal to transmit information related to wireless LAN connection to a base station according to another embodiment of the present invention.

Referring to FIG. 16, the base station 1601 may transmit logged measurement configuration information to the terminal 1609 (S1610). The record measurement configuration information includes related information for the wireless LAN signal quality measurement of the terminal 1609 when the terminal 1609 accesses the wireless LAN access point 1602. [

For example, the record measurement configuration information may be stored in the memory 1609 in a certain area (Region Configuration), a certain period (Logging Interval), a certain period (Logging Duration) (Received Channel Power Indicator), RSNI (Received Signal to Noise Indicator), and RSRP / RRSQ) for WLAN (AP SSID / BSSID / HESSID or channel information) . ≪ / RTI >

The terminal 1609 accesses the WLAN AP 1602 and measures the quality of the wireless LAN connection based on the recording measurement configuration information (S1620). The object, period, position, criterion, etc. of the connection quality measured by the terminal may be included in the recording measurement configuration information described above.

The terminal 1609 may log and store the wireless LAN connection quality information including the measured signal quality (S1630). Then, the terminal 1609 may transmit indication information on the WLAN connection related information including the WLAN quality information to the BTS 1601 (S1640).

The base station 1601 transmits a request signal for requesting wireless LAN connection related information based on the display information received from the terminal 1609 (S1650).

The terminal 1609 transmits the second signal including the wireless LAN connection related information based on the request signal of the base station 1601 (S1660).

As in the first embodiment, the first signal transmission / reception may be performed through an RRC connection procedure, an RRC connection reconfiguration procedure, or an RRC connection reset procedure. Also, as described in the first embodiment, the request signal and the second signal may be a terminal information request message or a terminal information response message.

Hereinafter, the operation according to the second embodiment of the present invention will be described by way of an RRC connection procedure.

17 is a diagram illustrating another example of a procedure for a terminal to transmit information related to wireless LAN connection to a base station according to another embodiment of the present invention.

Referring to FIG. 17, a terminal 1709 according to another embodiment of the present invention receives recording measurement configuration information from a base station 1701 (S1710).

That is, the base station 1701 transmits the logged measurement configuration information to the terminal 1709 (S1710). For example, the record measurement configuration information may include a certain WLAN (AP SSID / ID) for an Area Configuration, a Logging Interval, a Logging Duration, (Received Channel Power Indicator (RSSI), Received Signal to Noise Indicator (RSNI), RSRP / RRSQ) on the BSSID / HSSID or channel information .

Specifically, for example, each information included in the Logged Measurement Configuration information will be described below.

- Logging Area Information

   ■ Cell ID list (or TA (Tracking Area) / RA (Routing Area) / LA (Location Area) list): Performs quality measurement and logging operation only in the cell ID (TA / RA / LA) can do.

   SSID / BSSID / HESSID: You can perform quality measurement and logging operation only for the SSID.

- Logging Interval information

   Logging period: Contains information about the interval for recording the measured connection quality information. That is, the configuration information on how to store the measurement results at certain intervals. For example, period values such as 1280 ms, 2560 ms, 5120 ms, 10240 ms, 20480 ms, 30720 ms, 40960 ms, and the like may be included.

- Logging Duration information

   ■ Logging period: Includes information on how long to perform quality measurements. Or information on how long to perform the recording. For example, values of 10 min, 20 min, 40 min, 60 min, 90 min, 120 min, etc. may be included.

- Logging Trigger information

   ■ Periodic: Includes information on periodic recording performance.

   ■ Event: Contains information triggered when a specific event occurs. For example, the event may include information such as when the RSSI / RSNI of the WLAN is above a certain threshold value or when the RSSI / RSNI of the WLAN is below a certain threshold value have.

- Logging Target WLAN information

   (1) information of at least one of SSID information, BSSID information, HESSID information and wireless LAN channel information of a wireless LAN to be recorded; and the like.

   ■ Quality measurement (RSSI, RSNI): Contains information about the value that is the quality measurement reference. That is, it includes information on how to measure and record signal quality among various signal quality methods. For example, it may include information on whether to measure based on the receiving channel power of the signal or on the signal to noise ratio.

- Record status information (IDLE or Both)

(2) Includes setting information on whether the terminal is to be logged only when it is in the RRC idle state or to be logged even in the RRC connected state.

The terminal 1709 receives the recording measurement configuration information that may include the above-described information and performs wireless LAN connection quality measurement (S1720).

That is, the terminal 1709 performs wireless LAN quality measurement and recording based on the recording measurement configuration information. Measurement and recording based on the recording measurement configuration information can be applied when the terminal 1709 is in the RRC idle state. Or the terminal 1709 may be applied to the RRC Connected state.

For example, if the terminal 1709 is in the RRC idle state, it is measured and recorded based on the record measurement configuration, and in the case of the RRC connection state, the WLAN quality measurement can be performed according to the measurement configuration information. The terminal 1709 measures the WLAN quality according to the measurement configuration information and reports the measurement result to the base station 1701. The measurement report operation depends on the reporting configuration of the measurement configuration information.

As another example, the terminal 1709 can measure and record the quality of the WLAN based on the recording measurement configuration information in the idle state and the connected mode (Connected mode). The terminal 1709 may perform WLAN quality measurement and logging operations on logged measurement configuration information even though it is in the RRC Connected state. That is, the terminal 1709 measures WLAN quality according to a logged measurement configuration and logs measurement result information (S1730).

The terminal 1709 can record / store the wireless LAN connection quality information based on the recording measurement configuration information. The wireless LAN connection quality information may be transmitted through a reporting operation to the base station 1701. [

To be more specific, for example, the terminal 1709 transmits an RRC connection request message to establish an RRC connection with the base station 1701 (S1740). That is, when the connection with the wireless LAN is terminated, the terminal 1709 establishes an RRC connection with the base station and transmits the recorded quality information of the wireless LAN connection to the base station 1701.

The base station 1701 transmits an RRC connection setup message to the terminal 1709 (S1750). The RRC connection setup message may include information needed to establish an RRC connection between the terminal and the base station.

The terminal 1709 completes the RRC connection setup procedure with the base station 1701 and transmits an RRC connection setup complete message to the base station 1701 (S1760). In this case, the terminal 1709 may transmit the RRC connection setup complete message including indication information indicating that there is recorded WLAN connection quality information based on the record measurement configuration information described above. For example, the terminal 1709 can indicate that there is wireless LAN connection quality information by transmitting the display information in the RRC connection setup complete message with the logWLANMeasAvailable-r12 field or the existing logMeasAvailable-r10 field set to true.

An example in which the UE performs the RRC connection setup procedure with the base station and the indication information is included in the RRC connection setup complete message is described above.

As another example, the indication information may be included in the last completion message of each procedure when performing the RRC connection establishment / reestablishment / reconfiguration procedure. That is, the RRC connection establishment completion message or the RRC connection reset completion message or the RRC connection reconfiguration completion message may be included and transmitted.

Upon receiving the display information, the base station 1701 may transmit a request signal requesting the wireless LAN connection related information stored in the terminal 1709 (S1770). For example, the request signal may be a terminal information request message.

Upon receiving the request signal, the terminal 1709 transmits a second signal including the wireless LAN connection related information to the base station 1701 (S1780). In one example, the second signal may be a terminal information response message. For example, the WLAN connection related information including the WLAN connection quality information may be transmitted and included in the WLAN measurement record message field.

The wireless LAN connection related information transmitted from the terminal 1709 to the base station 1701 may include the above-described wireless LAN connection quality information.

As another example, the wireless LAN connection related information may further include the wireless LAN connection failure related information described in the first embodiment. That is, the terminal records the quality information of the wireless LAN connection during the wireless LAN connection and stores the wireless LAN connection failure information at the end time when the connection with the wireless LAN is terminated. The UE may transmit the WLAN connection related information including the recorded WLAN quality information and the WLAN connection failure information to the BS. The wireless LAN connection quality information and the wireless LAN connection failure information may be included in separate fields and transmitted.

18 is a diagram illustrating an example of a first signal including indication information of a WLAN measurement measurement message according to another embodiment of the present invention.

The RRC connection setup complete message may include indication information indicating that there is WLAN connection related information including WLAN connection quality information, as described in FIG. 17, for example.

Referring to FIG. 18, the RRC connection setup message 1800 may include the logWLANMeasAvailable-r12 field to transmit indication information. For example, if the value of the logWLANMeasAvailable-r12 field is set to true, the base station can confirm that the WLAN access quality information is recorded. In this example, the RRC connection setup message includes the logWLANMeasAvailable-r12 field as display information. As another example, the logWLANMeasAvailable-r12 field may be included as the indication information in the RRC connection establishment completion message or the RRC connection reset completion message or the RRC connection reconfiguration completion message. Alternatively, as an example, the display information on the recording of the wireless LAN connection quality information may be transmitted using the value of the existing logMeasAvailable-r10 field. That is, if the value of the existing logMeasAvailable-r10 field is set to true, the BS can confirm that the WLAN quality information is recorded. Also, as described above, the logMeasAvailable-r10 field may be included as display information in the RRC connection setup complete message, the RRC connection reset complete message, or the RRC connection reconfiguration complete message.

As described above, according to the present invention, a base station can receive wireless LAN connection related information including at least one of wireless LAN connection failure information and wireless LAN connection quality information from a terminal. Accordingly, the base station can grasp the wireless LAN connection problem and the information on the wireless LAN access quality based on the received information. The BS may change the threshold values used in the rule or rule for the wireless LAN connection of the UE to an appropriate value so that the wireless LAN connection failure problem does not occur in the corresponding region.

As described above, the wireless LAN connection related information may include the wireless LAN connection failure information and the wireless LAN connection quality information. Accordingly, each embodiment may be performed integrally or separately. For example, the terminal records the quality information of the wireless LAN connection during the connection with the wireless LAN, stores the wireless LAN connection failure information when the connection ends, and reports the failure information to the base station.

Hereinafter, the operation of each of the terminal and the base station to which the present invention can be performed will be described with reference to the drawings.

FIG. 19 is a flowchart illustrating an operation of a terminal according to another embodiment of the present invention.

In accordance with another aspect of the present invention, there is provided a method of reporting information related to wireless LAN connection to a base station, the method comprising: receiving information on at least one of wireless LAN connection failure information and wireless LAN access quality information, Transmitting a first signal including indication information on wireless LAN connection related information to a base station, receiving a request signal for requesting wireless LAN connection related information from the base station, And transmitting a second signal comprising information.

Referring to FIG. 19, the terminal may store WLAN connection related information including at least one of WLAN access failure information and WLAN access quality information (S1910). As described above, the terminal can store the wireless LAN related information at the time when the wireless LAN connection attempt has failed or the connection is terminated. Alternatively, the terminal may record and store the wireless LAN connection quality information based on the recording measurement configuration information during connection with the wireless LAN.

For example, the wireless LAN connection related information includes terminal position information, time information, wireless LAN AP information, access attempt wireless LAN AP information, access attempt mobile communication cell information, The wireless LAN AP signal quality information, and the signal quality information recorded during the wireless LAN connection by the terminal.

The terminal performs an RRC connection procedure with the base station and may transmit a first signal including indication information indicating that the wireless LAN connection related information is stored to the base station in step S1920. For example, the first signal may be one of an RRC connection setup complete message, an RRC connection reconfiguration complete message, an RRC connection reset complete message, and an RRC connection setup complete message.

The terminal can receive a request signal for requesting stored wireless LAN connection related information from the base station (S1930). For example, the request signal may be a terminal information request message.

The MS receives the request signal and transmits the second signal including the WLAN connection related information to the BS in step S1940. For example, the second signal may be either an RLF report, a WLAN failure report, and a WLAN measurement record message.

In the case of the above-described second embodiment, the terminal can further receive recording measurement configuration information for wireless LAN connection quality measurement from the base station.

20 is a flowchart illustrating an operation of a base station according to another embodiment of the present invention.

In accordance with another aspect of the present invention, there is provided a method for controlling reporting of a wireless LAN connection related information of a terminal in a base station, the method comprising the steps of: Receiving a first signal including indication information on information, transmitting a request signal requesting wireless LAN connection related information, and receiving a second signal including wireless LAN connection related information have.

Referring to FIG. 20, a base station can receive a first signal including indication information on wireless LAN connection related information from a terminal (S2010). For example, the first signal may be one of an RRC connection setup complete message, an RRC connection reconfiguration complete message, an RRC connection reset complete message, and an RRC connection setup complete message.

The base station can generate and transmit a request signal for requesting wireless LAN connection related information stored in the terminal (S2020). For example, the request signal may be a terminal information request message. When the BS receives the indication information through the final completion message of the RRC connection procedure with the MS, the BS can request information related to the WLAN connection stored in the MS through the MS information request message.

The base station can receive a second signal including information related to wireless LAN connection from the terminal (S2030). For example, the second signal may be either an RLF report, a WLAN failure report, and a WLAN measurement record message. Also, the second signal is a terminal information request message, and the RLF report, the WLAN failure report, and the WLAN measurement record message may be included in the terminal information request message and transmitted.

In the above-described second embodiment, the base station may further include transmitting recording measurement configuration information for wireless LAN connection quality measurement to the terminal before receiving the first signal. The terminal can measure and record the wireless LAN connection quality information based on the recording measurement configuration information.

The configuration of a terminal and a base station in which the present invention described above can be all performed will be described.

21 is a diagram illustrating a configuration of a terminal according to another embodiment of the present invention.

21, a user terminal 2100 according to another embodiment of the present invention includes a receiving unit 2130, a control unit 2110, and a transmitting unit 2120.

The terminal 2100 reporting the WLAN connection related information according to another exemplary embodiment of the present invention includes a wireless LAN connection related information including at least one of wireless LAN connection failure information and wireless LAN access quality information A transmission unit 2120 for transmitting a first signal including information on the connection to the base station including indication information on wireless LAN connection related information and a second signal including wireless LAN connection related information to the base station, And a receiving unit 2130 for receiving a request signal for requesting wireless LAN connection related information from the base station.

The controller 2110 can control the operation of measuring and storing the wireless LAN connection failure information and the wireless LAN connection quality information. For example, the control unit 2110 can control to measure and record the wireless LAN connection quality based on the recording measurement configuration information.

In addition, the control unit 2110 controls the overall operation of the terminal 2100 according to the connection switching between the mobile communication network and the wireless LAN and the wireless LAN connection related information required to perform the above-described present invention to the base station .

The receiving unit 2130 may further receive a signal including recording measurement configuration information for the wireless LAN connection quality measurement from the base station.

The receiver 2130 can receive downlink control information, data, and messages through the corresponding channel through the base station and the wireless LAN.

The transmitting unit 2120 transmits uplink control information, data, and messages through the corresponding channel through the base station and the wireless LAN.

22 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.

22, a base station 2200 according to another embodiment of the present invention includes a control unit 2220, a transmission unit 2230, and a reception unit 2210.

The base station 2200, which controls the reporting of the wireless LAN connection related information of the terminal according to another embodiment of the present invention, may include a wireless LAN connection related information including at least one of wireless LAN connection failure information and wireless LAN connection quality information And a transmitting unit 2230 for transmitting a request signal for requesting wireless LAN connection related information. The receiving unit 2210 includes a receiving unit 2210 for receiving a first signal including information on display of information, Lt; RTI ID = 0.0 > information. ≪ / RTI >

The control unit 2220 controls the overall operation of the base station 2200 according to the terminal connection switching control between the mobile communication network and the wireless LAN and the wireless LAN connection related information required for performing the above-described present invention from the terminal .

The transmitter 2230 may further transmit a signal including recording measurement configuration information for measuring the quality of a wireless LAN connection to the terminal.

The transmitting unit 2230 and the receiving unit 2210 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

As described above, according to the present invention, when a terminal performs interworking between a base station and a wireless LAN, when the connection with the wireless LAN terminates or fails, the terminal reports the wireless LAN connection related information to the base station, It is effective to acquire information related to the wireless LAN connection.

In addition, when the terminal is connected to the wireless LAN, the wireless LAN related information such as the connection quality information is recorded, and the information is recorded at the time of connection to the base station or periodically, thereby enabling the base station to efficiently transmit the mobile communication network and the wireless LAN coverage As shown in FIG.

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

Claims (20)

A method for a terminal to report wireless LAN connection related information to a base station,
Storing wireless LAN connection related information including at least one of wireless LAN connection failure information and wireless LAN access quality information;
Transmitting a first signal including indication information on the WLAN connection related information to the base station;
Receiving a request signal for requesting the wireless LAN connection related information from the base station; And
And transmitting a second signal including the WLAN connection related information to the base station. The method according to claim 1,
The wireless LAN connection-
Time information, wireless LAN AP information, access attempt wireless LAN AP information, access attempt mobile communication cell information, the mobile communication cell or the wireless LAN AP signal quality information, Further comprising at least one of the signal quality information recorded during the wireless LAN connection. The method according to claim 1,
Wherein the first signal comprises:
The RRC connection setup complete message, the RRC connection reconfiguration complete message, the RRC connection reset complete message, and the RRC connection setup complete message. The method according to claim 1,
Wherein the second signal comprises:
An RLF report, a WLAN failure report, and a WLAN measurement record message. The method according to claim 1,
Before storing the WLAN connection related information,
Further comprising receiving from the base station a signal including record measurement configuration information for the wireless LAN connection quality measurement,
And measuring and storing the wireless LAN connection quality based on the recording measurement configuration information. A method for a base station to control reporting of a wireless LAN connection related information of a terminal,
Receiving a first signal including indication information on wireless LAN connection related information including at least one of wireless LAN connection failure information and wireless LAN connection quality information;
Transmitting a request signal for requesting the wireless LAN connection related information; And
And receiving a second signal including the WLAN connection related information. The method according to claim 6,
The wireless LAN connection-
Time information, wireless LAN AP information, access attempt wireless LAN AP information, access attempt mobile communication cell information, the mobile communication cell or the wireless LAN AP signal quality information, Further comprising at least one of the signal quality information recorded during the wireless LAN connection. The method according to claim 6,
Wherein the first signal comprises:
The RRC connection setup complete message, the RRC connection reconfiguration complete message, the RRC connection reset complete message, and the RRC connection setup complete message. The method according to claim 6,
Wherein the second signal comprises:
An RLF report, a WLAN failure report, and a WLAN measurement record message. The method according to claim 6,
Before the first signal reception step,
Further comprising transmitting a signal comprising record measurement configuration information for the wireless LAN connection quality measurement. A terminal for reporting wireless LAN connection related information to a base station,
A wireless LAN connection failure information including at least one of wireless LAN connection failure information and wireless LAN connection quality information;
A transmitter for transmitting a first signal including indication information on the WLAN connection related information to the base station and transmitting a second signal including the WLAN connection related information to the base station; And
And a receiver for receiving a request signal for requesting the wireless LAN connection related information from the base station. 12. The method of claim 11,
The wireless LAN connection-
Time information, wireless LAN AP information, access attempt wireless LAN AP information, access attempt mobile communication cell information, the mobile communication cell or the wireless LAN AP signal quality information, And signal quality information recorded during the wireless LAN connection. 12. The method of claim 11,
Wherein the first signal comprises:
An RRC connection setup completion message, an RRC connection reconfiguration completion message, an RRC connection reset completion message, and an RRC connection setup completion message. 12. The method of claim 11,
Wherein the second signal comprises:
An RLF (Radio Link Failure) report, a WLAN failure report, and a WLAN measurement record message. 12. The method of claim 11,
The receiver may further comprise:
Further receiving a signal including recording measurement configuration information for the wireless LAN connection quality measurement from the base station,
Wherein the controller measures and stores the quality of the wireless LAN connection based on the recording measurement configuration information. A base station for controlling reporting of a wireless LAN connection related information of a terminal,
Receiving a first signal including display information on wireless LAN connection related information including at least one of wireless LAN connection failure information and wireless LAN connection quality information; And
And a transmitter for transmitting a request signal for requesting the WLAN connection related information,
Wherein the receiving unit further receives a second signal including the WLAN connection related information. 17. The method of claim 16,
The wireless LAN connection-
Time information, wireless LAN AP information, access attempt wireless LAN AP information, access attempt mobile communication cell information, the mobile communication cell or the wireless LAN AP signal quality information, And signal quality information recorded during the wireless LAN connection. 17. The method of claim 16,
Wherein the first signal comprises:
The RRC connection setup complete message, the RRC connection reconfiguration complete message, the RRC connection reset complete message, and the RRC connection setup complete message. 17. The method of claim 16,
Wherein the second signal comprises:
An RLF report, a WLAN failure report, and a WLAN measurement record message. 17. The method of claim 16,
The transmitter may further comprise:
Wherein the base station further transmits a signal including recording measurement configuration information for the wireless LAN connection quality measurement.

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