WO2014003355A1 - Method and device for transmitting and receiving interference information in a mobile communication network - Google Patents

Abstract

The present invention relates to a wireless communication system and a terminal, and a method and device for transmitting and receiving data between a base station and a terminal. A method for enabling a terminal to transmit interference information in a mobile communication network, according to one embodiment of the present invention, comprises the steps of: checking an in-device coexistence (IDC) interference problem and transmitting a message including first interference state information to a base station; operating a first prohibit timer when a cell in which the IDC interference problem occurs is a serving cell; and checking the IDC interference problem of the serving cell and transmitting a message including second interference state information after the first prohibit timer expires, wherein if the cell in which the IDC interference problem occurs includes a non-serving cell, the first prohibit timer is enabled or a second prohibit timer different from the first prohibit timer is enabled, or no prohibit timers are enabled for the non-serving cell.

Description

Method and apparatus for transmitting and receiving interference information in mobile communication network

The present invention relates to a wireless communication system and a terminal, and to a method and apparatus for transmitting and receiving data between a base station and a terminal. More particularly, the present invention relates to a method and apparatus for transmitting and receiving interference information in a mobile communication network.

As communication systems have evolved, consumers, such as businesses and individuals, have used a wide variety of wireless terminals. Mobile communication systems such as LTE (Long Term Evolution) and LTE-A (LTE-Advanced) of the current 3GPP series are high-speed, high-capacity communication systems that can transmit and receive various data such as video and wireless data, beyond voice-oriented services. As such, there is a demand for technology development capable of transmitting large amounts of data comparable to wired communication networks. As a method for efficiently transmitting a large amount of data, there is a transmission method using a plurality of cells. On the other hand, the base station receives the information on the interference situation of the signal from the terminal to adjust the parameters of the cell (carrier) used by the terminal to maintain the communication environment of the terminal. The terminal may transmit the interference information to the base station to solve the interference caused by using several wireless devices at the same time, in this case, there is a problem that the interference information does not need to be transmitted.

The present invention is intended to prevent unnecessary transmission of interference information by the terminal in transmitting the interference information to the base station to solve the interference between the radio modules caused by the simultaneous use of several wireless devices.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system and a terminal, and more particularly, to a method and an apparatus for transmitting and receiving data between a base station and a terminal. The base station uses interference information to solve interference between wireless modules generated by the terminal using several wireless devices simultaneously. The present invention relates to a more efficient transmission method and apparatus by preventing interference information from unnecessary terminals.

In a method for transmitting interference information in a mobile communication network by a terminal according to an embodiment of the present invention, identifying an in-device coexistence interference (IDC) interference problem and transmitting a message including first interference situation information to a base station; If the cell in which the IDC interference problem occurs is a serving cell, operating a first prohibit timer, and checking the IDC interference problem of the serving cell after the first prohibit timer expires. And transmitting a message including the interference situation information, wherein the first prohibit timer is operated on the non-serving cell when the cell having the IDC interference problem includes a non-serving cell. Or operate the second prohibit timer different from the first prohibit timer or do not operate the prohibit timer.

According to another embodiment of the present invention, a method for receiving interference information in a mobile communication network includes: receiving a message including first interference situation information from a terminal which identifies an in-device coexistence interference (IDC) interference problem; And if the cell in which the IDC interference problem occurs is a serving cell, receiving a message including second interference situation information from the terminal after a first period expires, wherein the IDC interference problem occurs. When the cell in which is generated includes a non-serving cell, the third interference situation information is received from the terminal after the first period or a period distinct from the first period for the non-serving cell. It is done.

In a terminal for transmitting interference information in a mobile communication network according to an embodiment of the present invention, a receiver for receiving a message from a base station, an IDC (in-device coexistence interference) interference problem, and a cell in which the interference problem occurs And a transmitter for transmitting a message including the interference situation information generated by the controller, wherein the controller checks an IDC interference problem and the cell where the IDC interference problem occurs is a serving cell. Operate a first prohibit timer, and the control unit checks an IDC interference problem of the serving cell after the first prohibit timer expires and controls the transmitter to transmit a message including second interference situation information; The controller may be configured to inform the non-serving cell if the cell having the IDC interference problem includes a non-serving cell. To the claim 1 characterized in that to operate the prohibition timer or the first to operate the second timer prohibits distinct from the first prohibition timer or not to prohibit the operation timer.

In the base station for receiving interference information in a mobile communication network according to another embodiment of the present invention, a transmitting unit for transmitting a message to the terminal, a receiving unit for receiving a message including the interference status information from the terminal, and the transmitting unit and the receiving unit And a control unit, wherein the receiving unit receives a message including the first interference situation information from the terminal confirming the in-device coexistence interference (IDC) interference problem, and then the serving cell is the serving cell. cell, after the first period expires, a message including the second interference situation information is received from the terminal, and the receiver includes a non-serving cell in which the IDC interference problem occurs. The third interference situation is determined from the terminal after the first period or a period distinct from the first period for the non-serving cell. Characterized in that the receiving.

By implementing the present invention, when transmitting interference information to the base station to solve the interference between the radio module generated by the simultaneous use of several wireless devices, the terminal can prevent unnecessary interference transmission of the terminal.

1 illustrates a mutual interference problem between wireless modules in a terminal.

2 shows a procedure for solving an IDC interference problem.

3 and 4 show prohibit timer operations (procedures).

5 shows an IDC procedure.

6 is an operation procedure in a terminal according to an embodiment of the present invention.

7 is an operation procedure in a terminal according to another embodiment of the present invention. The entire procedure of an embodiment having a prohibit timer for each carrier frequency.

8 is an operation procedure in a terminal according to another embodiment of the present invention.

9 is an embodiment of an IDC indication message.

10 is an embodiment of an IDC Context.

11 is an operation procedure in a terminal according to an embodiment of the present invention.

12 is an operation procedure at a base station according to an embodiment of the present invention.

13 is a diagram illustrating a configuration of a base station according to an embodiment of the present invention.

14 is a view showing the configuration of a user terminal according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB). In the present specification, a user terminal is a comprehensive concept of a terminal in wireless communication. In addition to user equipment (UE) in WCDMA, LTE, and HSPA, as well as MS (Mobile Station), UT (User Terminal), SS in GSM, It should be interpreted as a concept that includes a 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, an Sector, a Site, and a BTS. It may be called other terms such as Base Transceiver System, Access Point, Relay Node.

That is, in the present specification, a base station or a cell is interpreted in a comprehensive sense to indicate some areas or functions covered by a base station controller (BSC) in CDMA, a NodeB in WCDMA, an eNB or a sector (site) in LTE, and the like. It is meant to cover various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node communication range.

In the present specification, the user terminal and the base station are used in a comprehensive sense as two entities (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 the terms or words specifically referred to. Do not. Here, the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal, the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.

There is no limitation on the multiple access scheme applied to the wireless communication system. Various multiple access techniques 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-TDMA, OFDM-CDMA Can be used. One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB. The present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.

The uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.

In addition, in a system such as LTE or LTE-A, a standard is formed by configuring uplink and downlink based on one carrier or a pair of carriers. Uplink and downlink transmit control information through control channels such as Physical Downlink Control CHannel (PDCCH), Physical Control Format Indicator CHannel (PCFICH), Physical Hybrid ARQ Indicator CHannel (PHICH), and Physical Uplink Control CHannel (PUCCH). A data channel is configured such as PDSCH (Physical Downlink Shared CHannel), PUSCH (Physical Uplink Shared CHannel) and the like to transmit data.

In the present specification, a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.

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

The multiple transmit / receive point is at least one having a base station or a macro cell (hereinafter referred to as an eNB) and a high transmission power or a low transmission power in a macro cell region, which is wired controlled by an optical cable or an optical fiber to the eNB. RRH (Remote Radio Head) may be.

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

Hereinafter, a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, and a PDSCH may be described in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, and a PDSCH.'

The eNB performs downlink transmission to the terminals. The eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required to receive the PDSCH. For example, a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted. Hereinafter, the transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel.

In this case, the first terminal UE1 may transmit an uplink signal to the eNB and the second terminal UE may transmit an uplink signal to the RRH.

Measurement in LTE Systems

In a mobile communication system, mobility support of a terminal is essential. For mobility support, the UE continuously measures the signal quality of a serving cell that is currently being serviced and the signal quality of neighboring cells around 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 terminal by instructing the terminal to handover to a neighbor cell based on the measurement result reported by the terminal.

 The terminal determines the measurement target according to the measurement configuration set by the base station and reports the corresponding result. Upon receiving the message including the measurement configuration, the UE performs the measurement and reports the measurement result.

Measurement configuration includes the following parameters.

Measurement objects : Objects to be measured by the terminal. The measurement object set in the terminal position is one of an intra-frequency measurement object, an inter-frequency measurement object, or an inter-RAT measurement object, respectively. In the case of intra-frequency and inter-frequency measurement, the measurement object is one LTE carrier frequency.

Reporting configuration : Setting when the UE should report the measured result to the base station.

Measurement identities : IDs that link a specific measurement object with a specific reporting configuration.

Quantity configurations : settings for filtering measurement quantities and measurement results

-Measurement gaps : The time allocated for purely measurement by the terminal as no transmission / reception of the data of the corresponding terminal.

IDC (In-device coexistence interference)

One terminal may be equipped with several transmitters and receivers for wireless communication such as LTE, WiFi, Bluetooth (BT), and Global Navigation Satellite System (GNSS). These wireless transceivers can be used simultaneously as needed, such as simultaneous use of LTE and WIFi for traffic distribution, VoLTE service using a BT wireless headset, and additional GNSS receiver operation to obtain accurate location information of the terminal.

 Multiple types of transceivers (modules) such as LTE, BT, WiFi, GNSS, etc. are placed in close proximity to one small terminal, so that the signal strength from one transmitter is the receiver of another module in the same terminal. Larger cases may occur.

In the following description, it is assumed that a GPS operates in a terminal as an example of a global navigation satellite system (GNSS). However, since the description is assumed to be GPS only for the purpose of understanding the present invention, the GPS is a Global Navigation Satellite System (GLONASS), an European Satellite Navigation System (GALILEO), a Quasi-Zenith Satellite System (QZSS), or a GPS Aided (GAGAN). It should be widely understood as GNSS including Geo Augmented Navigation, and the scope of rights is not limited to GPS.

FIG. 1 illustrates a situation in which mutual interference between wireless modules may occur because LTE, GPS, BT / WiFi, etc. operate within one terminal. The use of filter technology and sufficiently separated frequencies for each module prevents interference between the two transceivers. However, if multiple radio transceivers are operating at adjacent frequencies, current filter technology will not be able to eliminate the interference sufficiently.

Hereinafter, interference occurring between different transceivers in one terminal is referred to as IDC interference (In-device coexistence interference).

1 illustrates a mutual interference problem between wireless modules in a terminal.

The wireless communication modules may cause an IDC interference problem in the following cases.

-LTE TDD can operate in Band 40 (2300 ~ 2400MHz), WiFi, Bluetooth can operate in ISM Band (2400 ~ 2483.5MHz). In this case, the transmission of LTE may interfere with WiFi and Bluetooth, and the transmission of WiFi or Bluetooth may interfere with the reception of LTE.

-LTE FDD can transmit uplink in Band 7 (2500 ~ 2570MHz), WiFi, Bluetooth can operate in ISM Band (2400 ~ 2483.5MHz). In this case, uplink transmission of LTE may interfere with reception of WiFi or Bluetooth.

-LTE FDD can transmit uplink in Band 13 (UL: 777 ~ 787MHz) or Band 14 (UL: 788 ~ 798MHz), and GPS radio can receive at 1575.42MHz. In this case, the uplink transmission of the LTE may interfere with the reception of the GPS. Or if LTE FDD transmits upstream at Band 7 (2500 ~ 2570MHz) and GPS radio receives at 2.5GHz, L5 (1164 ~ 1215Mhz) or S (2483.5 ~ 2500MHz), uplink transmission of LTE May interfere.

The first of several directions for solving the IDC interference problem is to change the frequency of the LTE communication module (Frequency Division Multiplexing (FDM)) when interference between the LTE communication module and wireless communication modules such as BT / WLAN / GNSS occurs. . The second method is time division multiplexing (TDM) between communication modules that coexist in a frequency band where interference occurs.

In order to solve the IDC interference problem, cooperation between the terminal and the base station is required. That is, a handover (HO) for changing an LTE frequency used to avoid IDC interference to another frequency, and a scheduling of a base station for dividing a time resource between an LTE module and another communication module. However, because the IDC interference is a problem that occurs within one terminal, the base station is difficult to know, so the terminal transmits IDC interference-related information to the base station in case of an IDC problem that the terminal cannot solve itself, and the base station based on the received information It can be given a solution (HO or scheduling) to solve the IDC problem.

2 shows a procedure for solving an IDC interference problem.

The terminal 201 has defined a new message S220 called IDC Indication to inform the base station 209 of the IDC problem S210, and includes the following information.

Unusable frequency : Carrier frequencies with interference. The carrier frequency considering the IDC interference problem is limited to a carrier frequency set as a measurement object in a measurement configuration previously received by a terminal from a base station.

Desired sub-frame reservation bitmap patterns (for LTE + BT voice) or desired DRX cycle periodicity / length and active time (for other cases): DRX configuration information for the UE to resolve IDC interference.

In the IDC solution S230, HO (handover) or DRX (discontinuous reception) may be set.

IDC Indication may be transmitted to mean that the IDC interference problem is eliminated even when the IDC interference problem is mitigated or terminated. Prohibit timer is also used to prevent frequent transmission of IDC Indication. That is, the terminal starts the prohibit timer when the IDC Indication is transmitted, and does not transmit the IDC Indication again until the timer expires.

Prohibit timer action

-Start: Start Inhibit Timer when sending IDC Indication.

Stop : Stops the prohibit timer when a solution is received from the base station for IDC interference resolution. The solution includes handover, changing DRX settings, and the like.

Upon expiration : When the prohibit timer expires, the terminal transmits an IDC Indication and restarts the timer.

After transmitting the IDC Indication, the terminal operates the prohibit timer according to the set value. The value of the timer may be set by the base station or may be a value predefined in the specification. While the inhibit timer is in operation, the UE does not transmit IDC Indication again.

3 and 4 show prohibit timer operations (procedures).

In FIG. 3, if the terminal 301 finds an IDC interference problem (S310), the UE starts a timer and transmits an IDC Indication to the base station 309 (S320). At this time, the interference frequency information may be transmitted together. The base station 309 may transmit a message instructing handover or DRX resetting to the terminal 301 (S330). In this case, the timer is stopped. Thereafter, IDC Indication is not sent until the prohibit timer expires.

In FIG. 4, if the UE 401 finds an IDC interference problem (S410), a timer is started and an IDC Indication is transmitted to the base station 409 (S420). At this time, the interference frequency information may be transmitted together. After the prohibit timer expires, IDC Indication is not sent even if IDC interference problem is found. Thereafter, when the timer expires, the terminal 401 restarts the timer and transmits an IDC Indication to the base station 409 (S440).

When the IDC interference problem occurs, the overall operating procedure of the terminal is shown in FIG.

5 shows an IDC procedure.

1. The UE checks an IDC interference problem for a carrier set as a measurement object (S510), and if a serious IDC interference problem is found that the UE cannot solve (S520), it transmits an IDC Indication to the base station to present IDC interference. Notify that there is a problem (S530). The IDC Indication may include information such as frequency, DRX cycle, length, etc., in which IDC interference has occurred.

2. Upon receiving the IDC Indication, the base station may change the DRX configuration based on the received DRX configuration information or the like for handover of the terminal to another frequency to solve the IDC interference problem of the terminal.

3. The terminal transmits an IDC Indication and then starts a prohibit timer (S540). The timer is started or restarted every time IDC Indication is sent.

4. When the prohibit timer expires (S550), the terminal checks again whether the IDC interference situation disappears.

5. If the IDC interference situation is terminated, the terminal transmits an IDC Indication that the termination to the base station.

6. If there is still an IDC interference situation, the process is performed again from S510.

If the IDC interference problem occurs at a carrier frequency to which the serving cell does not belong, the UE will deliver an IDC Indication to the base station. However, the IDC interference of the UE currently occurs at a different carrier frequency from the serving cell, and there is no problem in communication with the serving cell at this state. Therefore, the base station will not transmit any solution to the terminal. The terminal starts a prohibit timer after transmitting the IDC Indication, checks the interference again every time it expires, and again transmits the IDC Indication if the interference still exists.

That is, when IDC interference is found in the non-serving cell, the terminal continuously transmits an IDC indication at every prohibit timer period. However, since the non-serving cells are only candidate target cells for handover and are not currently connected cells, it is wasteful to continuously report the IDC interference problem to the network. On the other hand, if the carrier frequency to which the non-serving cell that the IDC interference problem occurs to prevent unnecessary IDC Indication transmission is excluded from the measurement object, the UE does not check the IDC interference situation for the carrier frequency, the interference has been eliminated to the base station Not able to send an IDC indication, and the base station is considered that the terminal continues to cause IDC interference problem in the carrier frequency, so that the terminal is not able to continue to access the cells of the carrier frequency.

In addition, when a terminal having IDC interference in the serving cell sends an IDC Indication to the base station and the base station hands over the terminal to solve the IDC problem, the current operation is performed despite the elimination of the IDC interference problem for the serving cell. The terminal still needs to transmit IDC Indication every prohibit timer period.

Hereinafter, in the present specification, in transmitting IDC interference information, a method and apparatus for classifying an interference situation of a terminal and excluding unnecessary operation of continuously transmitting IDC interference information in a specific situation are presented, and the terminal is absolutely necessary. Only to transmit the IDC interference information to the base station.

In order to solve the problem, the terminal discovering the IDC interference problem transmits the IDC Indication to the base station. In addition, it is checked whether the corresponding IDC interference problem occurs in the serving cell, and if the interference does not occur in the carrier frequency of the serving cell, the inhibit timer is not operated. Thereafter, the IDC radio module (WiFi, BT, GNSS, etc.) is turned off, the frequency is changed during operation on the IDC radio module side, or the amount of communication on the other side is reduced, thereby reducing the IDC radio frequency to the non-serving cell carrier frequency. Only when the interference is mitigated or eliminated, an IDC Indication is sent indicating that the interference has been lost.

6 is an operation procedure in a terminal according to an embodiment of the present invention.

1. The UE checks the IDC interference problem with respect to the carrier frequency set as the measurement object in the previously received measurement configuration (S610).

2. If the UE detects a serious IDC interference problem that the UE cannot solve (S620), it transmits an IDC Indication to the base station (S630) to inform that there is a current IDC interference problem. The IDC Indication may include information such as frequency, DRX cycle, length, etc., in which IDC interference has occurred.

3. The UE checks whether the carrier frequency of the serving cell is included in the carrier frequency information included in the IDC Indication (S640).

4. If the carrier frequency of the serving cell is included in the IDC Indication, the terminal operates a prohibit timer (S650). The UE does not transmit IDC interference information to the base station while the prohibit timer is operating. When the prohibit timer expires (S660), the process returns to operation S610 to check again for IDC interference.

5. If the carrier frequency of the serving cell is not included in IDC Indication, the terminal does not operate the prohibit timer.

The terminal checks whether another radio module (WiFi, BT, GNSS, etc.) causing IDC interference is turned off or if the frequency is changed on the other radio module side or the amount of communication is reduced (S642). If the problem of IDC interference in the UE is mitigated or eliminated (S644), the UE transmits an IDC Indication that the interference has disappeared with respect to the carrier frequency (S646).

Example) Multiple-prohibit timers

There may be a plurality of IDC prohibit timers. The terminal may individually operate the inhibit timer for each carrier frequency that finds the IDC interference problem, or may operate the corresponding inhibit timer by dividing the serving cell carrier frequency and the non-serving cell carrier frequency. The timers have different timer setting values, and the other timer setting values may be values previously defined in the specification or may be set from the base station. In general, the IDC interference for the non-serving cell is not urgent, so the prohibit timer value of the non-serving cell is set longer than the prohibit timer value of the serving cell, so that the IDC interference check period of the IDC Indication for the non-serving cell is determined. You can take a long time.

The terminal discovering the IDC interference problem transmits the IDC Indication to the base station. In addition, it is checked whether a corresponding IDC interference problem occurs in the serving cell, and if the interference occurs in the carrier frequency of the serving cell, the prohibit timer for the serving cell is operated.

If the interference occurred in the non-serving cell, the prohibit timer for the non-serving cell is operated.

If any one of the prohibit timers (if there are a plurality of prohibit timers in operation) expires, the IDC interference of the carrier frequency is checked again, if there is an IDC interference problem, and transmits an IDC Indication to the base station and the timer Restart.

Example 1

7 is an operation procedure in a terminal according to another embodiment of the present invention. The entire procedure of an embodiment having a prohibit timer for each carrier frequency.

1. The UE checks the IDC interference problem with respect to the carrier frequency set as the measurement object in the previously received measurement configuration (S710).

2. When the UE detects a serious IDC interference problem that the UE cannot solve (S720), it transmits an IDC Indication to the base station to inform that there is a current IDC interference problem (S730). The IDC Indication may include information such as an unusable frequency, a DRX period, and a length of IDC interference.

3. The terminal checks whether there is a carrier frequency of a serving cell among carrier frequency information included in the IDC Indication (S740). If the carrier frequency of the serving cell is in IDC Indication, the UE operates after setting the prohibit timer value for the serving cell for the corresponding frequency (S750).

4. The UE checks whether there is a carrier frequency of the non-serving cell among the carrier frequency information included in the IDC Indication (S740). If there is, the UE operates after setting the prohibition timer value for the non-serving cell for each carrier frequency (S742).

5. The prohibit timer can be operated at the same time as the number of carrier frequency included in the IDC Indication. Alternatively, one such as one representing a serving cell carrier frequency and one representing non-serving cell carrier frequencies may operate at the same time. That is, the steps S750 and S760 and S742 and S744 may be performed at the same time.

6. The UE does not transmit IDC interference information to the base station while the prohibit timer is operating (S760, S744). If any of the forbidden timers expire, the process returns to S710 to check again for IDC interference. When the IDC Indication is transmitted because interference still exists, the unusable frequency information at this time may include all carrier frequencies for which an IDC interference problem is currently found.

Example 2)

8 is an operation procedure in a terminal according to another embodiment of the present invention. The entire procedure of the embodiment having two kinds of inhibiting timers (the inhibiting timer of the serving cell carrier frequency and the inhibiting timer of the non-serving cell carrier frequency).

1. The UE checks the IDC interference problem with respect to the carrier frequency set as the measurement object in the previously received measurement configuration (S810).

2. If the UE detects a serious IDC interference problem that the UE cannot solve (S820), it transmits an IDC Indication to the base station to inform that there is a current IDC interference problem (S830). The IDC Indication may include information such as frequency, DRX cycle, length, etc., in which IDC interference has occurred.

3. The UE checks whether the carrier frequency of the serving cell is included in the various carrier frequency information included in the IDC Indication (S840).

4. If the carrier frequency of the serving cell is included in the IDC Indication, the terminal operates the timer after setting the prohibit timer value for the serving cell (S850). If all of the frequencies included as unusable frequencies in the IDC Indication are configured only with carrier frequencies of the non-serving cell, the terminal operates the timer after setting the prohibition timer value for the non-serving cell (S842). There is no case where a plurality of prohibit timers are operating at the same time.

5. While the prohibit timer is in operation (S860 or S844), the terminal does not transmit IDC interference information to the base station. When the prohibit timer expires, the process returns to operation S810 to check again for IDC interference.

In the present invention, when the terminal transmits the interference information to the base station for the interference situation in the terminal, in order to solve the problem that is periodically transmitted unnecessarily, the terminal distinguishes the situation to transmit the interference information to the base station only when necessary, Prevent waste of interference information transmission.

 When severe IDC interference occurs, the terminal checks the carrier frequency where the IDC interference occurs, and determines whether the IDC interference problem is interference with the carrier frequency of the serving cell. If it is about the carrier frequency of the non-serving cell, the IDC interference of the corresponding UE currently occurs at a different carrier frequency from the serving cell, and there is no problem in communication with the serving cell in the present state. However, the terminal continues to transmit the IDC indication for each prohibit timer period. In order to prevent this, if the carrier frequency to which the non-serving cell having the IDC interference problem belongs is subtracted from the measurement object, periodic transmission of the IDC indication can be prevented. However, in this method, since the UE no longer checks the IDC interference for the corresponding carrier frequency and also does not transmit the IDC indication, the base station cannot know whether the IDC interference has changed with respect to the carrier frequency. Therefore, there is a serious problem that cannot be used because it is regarded as an unusable frequency of a corresponding UE for a carrier frequency once an IDC interference problem is found, which is not a perfect solution for periodic transmission of an IDC indication.

In addition, when a terminal having IDC interference in the serving cell sends an IDC indication to the base station and the base station hands over the terminal to solve the IDC problem, the IDC interference is non-served even though the IDC interference problem for the serving cell is eliminated. Since the cell has been changed to a problem, according to the current operation, the terminal still needs to transmit IDC Indication every prohibit timer period.

6 to 8, the prohibit timer is executed independently of the serving cell and the non-serving cell. The prohibit timer checks whether the carrier frequency of the serving cell is included among various carrier frequency information included in IDC Indication.

9 is an embodiment of an IDC indication message.

9 shows InDeviceCoexIndication-r11, which is an example of a configuration of an IDC indication that a terminal transmits to a base station as indicated by 900. Among these, if the "affectedCarrierFreqList-r11" element 910 is checked, it may be checked whether the carrier frequency of the serving cell is included.

"affectedCarrierFreqList-r11" is of type "AffectedCarrierFreqList-r11 " , the details of which include carrier frequency and interferenceDirection-r11, such as 920. This shows a list of carrier frequencies that are affected by the IDC problem.

The terminal may operate the prohibit timer by dividing the serving cell and the non-serving cell while transmitting an IDC indication to the base station.

10 is an embodiment of an IDC Context.

10 is a configuration of an information element (IE) used by a terminal to solve an IDC problem. As indicated by 1000, the UE may check whether the carrier frequency of the serving cell is included in the IDC using the IDC Context IE. The IDC Context IE also includes an "affectedCarrierFreqList-r11" element as in the IDC indication message of FIG. 9 as shown in 1010.

11 is an operation procedure in a terminal according to an embodiment of the present invention. 6 to 8 include the embodiments described above.

The terminal checks the IDC interference problem (S1110). As a result of the check, it is determined whether the interference situation information needs to be transmitted to the base station (S1120), and if it is not necessary to transmit, the interference situation is continuously checked. If it is necessary to transmit, a message including the interference situation information is transmitted to the base station (S1130). Thereafter, the terminal checks whether an interference situation occurs only in the serving cell (S1140). When the interference situation occurs only in the serving cell, the prohibit timer for the serving cell (first prohibit timer) is started (S1142), and until the prohibit timer expires (S1144), the terminal no longer includes a message containing the interference situation information. Do not send. This includes the case of serving cells according to the embodiment described with reference to FIG. 6 (S640, S650, and S660). On the other hand, if the interference does not occur only in the serving cell, it is checked whether the interference occurs in both the serving cell and the non-serving cell (S1150). If all occur, check whether the second prohibit timer, which is a separate prohibit timer for the non-serving cell, is operated (S1160), and when the separate prohibit timer is operated, the prohibit timer for the serving cell (first prohibit timer). ), And a prohibit timer (second prohibit timer) for the non-serving cell is started for the non-serving cell (S1162). The non-serving cell checks whether the non-serving cell prohibit timer expires (S1164), and also the serving cell checks whether the prohibiting cell prohibit timer expires (S1144). After each timer expires, the process goes to step S1110. S1162 and S1164 include S742 and S744 of FIG. 7 above. On the other hand, when the separate prohibit timer is not operated for the non-serving cell in S1160, the prohibit timer for the serving cell is started (S1142). This includes the embodiments of S840, S850, S860 of FIG. If the interference situation is found only for the non-serving cell in S1150, it is checked whether the second prohibit timer for the non-serving cell is operated (S1170). When the separate prohibit timer is operated, the prohibit timer for the non-serving cell is started (S1162) and the base station is not informed of the interference situation information until the prohibit timer expires (S1164). This includes S742 and S744 in FIG. 7 and S842 and S844 in FIG. 8. On the other hand, if the separate prohibition timer for the non-serving cell is not operated (S1170), it is checked whether the IDC situation is resolved (S1172), and if solved, a message including the interference situation information to inform the resolution of the interference situation. It transmits (S1174). This includes the steps of S642, S644, S646 in FIG.

The message including the interference situation information may be the IDC indication message described above. The second prohibit timer may be implemented such that its period is longer than the first prohibit timer.

12 is an operation procedure at a base station according to an embodiment of the present invention. 6 to 8 include the embodiments described above.

The base station waits to receive a message from the terminal (S1210). In the waiting process, a message including the interference situation information is received from the terminal (S1220). If the interference occurs only in the serving cell (S1230), since the terminal applies the first prohibit timer, which is the prohibit timer for the serving cell, to the serving cell, after the first period, which is the period of the first prohibit timer, expires, the base station is determined from the terminal. A message including the interference situation information is received (S1240).

On the other hand, when the interference occurs in the serving cell and the non-serving cell (S1250), it is divided according to whether or not the second inhibit timer, which is a separate inhibit timer for the non-serving cell, is operated (S1260). That is, when the second prohibit timer operates for the non-serving cell, the terminal operates the prohibit timer corresponding to the first period for the serving cell and the prohibit timer for the second period for the non-serving cell. After the first period or the second period expires, the base station receives a message including the interference situation information from the terminal (S1262).

On the other hand, if the interference situation occurs only in the non-serving cell, if the second prohibit timer is operated for the non-serving cell, the terminal operates the prohibit timer corresponding to the second period for the non-serving cell, so after the second period expires The base station receives a message including the interference situation information from the terminal (S1272). On the other hand, if the second prohibit timer does not operate in the non-serving cell, the base station receives a message including the interference situation information from the terminal confirming the resolution of the interference problem (S1272).

The message including the interference situation information may be the IDC indication message described above. The second period of the prohibition timer for the non-serving cell may be implemented such that the period is longer than the first period of the prohibition timer for the serving cell.

13 is a diagram illustrating a configuration of a base station according to an embodiment of the present invention.

Referring to FIG. 13, the base station 1300 includes a control unit 1310, a transmitter 1320, and a receiver 1330.

The controller 1310 controls the overall operation of the base station according to the IDC procedure necessary to perform the above-described present invention.

The transmitter 1320 and the receiver 1330 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention.

In more detail, the transmitter 1320 transmits a message to the terminal, and the receiver 1330 receives a message including interference situation information from the terminal. The controller controls the transmitter and the receiver. As described above with reference to FIGS. 6 to 12, when the receiver 1330 receives a message including the first interference situation information from the terminal confirming the IDC interference problem, the cell in which the IDC interference problem occurs is a serving cell. After the first period expires, a message including the second interference situation information is received from the terminal. The first period means the period of the prohibit timer for the serving cell.

On the other hand, when the cell in which the IDC interference problem occurs is a non-serving cell, for a terminal that does not operate a separate timer, the receiver 1330 determines a third solution from the terminal that has confirmed resolution of the IDC interference problem for the non-serving cell. Receive a message containing interference situation information.

When the cell in which the IDC interference problem occurs is a non-serving cell, for a terminal that operates a separate timer, the receiving unit 1330 after the second period, which is a period of a timer for the non-serving cell operated by the terminal, expires. And receiving a message including third interference situation information from the terminal, wherein the second period has a longer period than the first period.

When the cell in which the IDC interference problem occurs is a serving cell and a non-serving cell, the receiver 1330 may receive a message including third interference situation information of the serving cell or the non-serving cell after the first period expires. Receive from the terminal.

The message containing the interference situation information includes an IDC indication message. In addition, the message including the interference status information may be the IDC indication message described above.

14 is a view showing the configuration of a user terminal according to an embodiment of the present invention.

Referring to FIG. 14, the user terminal 1400 includes a receiver 1410, a controller 1420, and a transmitter 1430.

The receiver 1410 receives downlink control information, data, and a message from a base station through a corresponding channel.

In addition, the controller 1420 controls the overall operation of the terminal according to the IDC procedure necessary to perform the above-described present invention.

The transmitter 1430 transmits uplink control information, data, and a message to a base station through a corresponding channel.

In more detail, the receiver 1410 receives a message from a base station, and the controller 1420 identifies an IDC interference problem and identifies a cell in which the interference problem occurs. Of course, it also activates the prohibit timer associated with each serving cell. The transmitter 1430 transmits a message including the interference situation information generated by the controller 1420. The controller 1420 checks an IDC interference problem, and when the cell in which the IDC interference problem occurs is a serving cell, operates the first prohibit timer, and then the controller 1420 performs the serving after the first prohibit timer expires. The IDC interference problem of the cell is checked to control the transmitter 1430 to transmit a message including the second interference situation information.

On the other hand, when the cell in which the IDC interference problem occurs is a non-serving cell, the controller 1420 determines whether the IDC interference problem for the non-serving cell is solved and the transmitter 1430 includes a third interference situation information. Control to send.

Meanwhile, when the cell in which the IDC interference problem occurs is a non-serving cell, the controller 1420 operates a second prohibit timer, and after the second prohibit timer expires, identify the IDC interference problem for the non-serving cell. The transmitter 1430 may control to transmit a message including the third interference situation information, and the second prohibit timer may have a longer period than the first prohibit timer.

In addition, when the cell in which the IDC interference problem occurs is a serving cell and a non-serving cell, the control unit 1420 checks the IDC interference problem of the serving cell or the non-serving cell after the first prohibit timer expires, and then transmits The control unit 1430 transmits a message including the third interference situation information.

The message containing the interference situation information includes an IDC indication message. In addition, the message including the interference situation information may be the IDC indication message described above. The standard or standard documents mentioned in the above embodiments are omitted to simplify the description of the specification. Configure Accordingly, the addition of the contents of the above standard and some of the standard documents to this specification or written in the claims should be interpreted as falling within the scope of the present invention.

Specifically, the following documents, which are attached below, form a part of this specification as part of already published documents. Accordingly, the addition of the contents of the above standard and some of the standard documents to this specification or written in the claims should be interpreted as falling within the scope of the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application is filed with the Korean Patent Application No. 10-2012-0068215 filed in Korea on June 25, 2012 and the patent application No. 10-2013-0031262 filed in Korea on March 25, 2013. Priority is claimed under section (a) (35 USC § 119 (a)), all of which is incorporated by reference in this patent application. In addition, if this patent application claims priority for the same reason for countries other than the United States, all its contents are incorporated into this patent application by reference.

Claims (16)

1. In the method for the terminal to transmit interference information in a mobile communication network,

   Identifying an in-device coexistence interference (IDC) interference problem and transmitting a message including the first interference situation information to the base station;

   Operating a first prohibit timer when the cell in which the IDC interference problem occurs is a serving cell; And

   Checking an IDC interference problem of the serving cell after the first prohibit timer expires, and transmitting a message including second interference situation information.

   If the cell in which the IDC interference problem occurs includes a non-serving cell cell, operate the first prohibit timer for the non-serving cell or provide a second prohibit timer that is distinct from the first prohibit timer. Operating or not operating the prohibit timer.
2. The method of claim 1,

   If the cell in which the IDC interference problem occurs is the non-serving cell, determining whether an IDC interference problem for the non-serving cell is solved and transmitting a message including third interference situation information.
3. The method of claim 1,

   Operating the second prohibit timer when the cell in which the IDC interference problem occurs is the non-serving cell; And

   Identifying an IDC interference problem for the non-serving cell after the second prohibit timer expires, and transmitting a message including third interference situation information.

   And the second prohibit timer is a longer period than the first prohibit timer.
4. The method of claim 1,

   When the cell in which the IDC interference problem occurs is the serving cell and the non-serving cell, after the first prohibit timer expires, the IDC interference problem of the serving cell or the non-serving cell is checked and includes third interference situation information. And sending the message.
5. In the method for the base station receives the interference information in the mobile communication network,

   Receiving a message including first interference situation information from a terminal confirming an in-device coexistence interference (IDC) interference problem; And

   If the cell in which the IDC interference problem occurs is a serving cell, after the first period expires, receiving a message including second interference situation information from the terminal;

   When the cell in which the IDC interference problem occurs includes a non-serving cell, third interference situation information is received from the terminal after the first period or a period different from the first period for the non-serving cell. Receiving.
6. The method of claim 5,

   If the cell in which the IDC interference problem occurs is the non-serving cell, receiving a message including the third interference situation information from the terminal confirming the resolution of the IDC interference problem for the non-serving cell.
7. The method of claim 5,

   If the cell in which the IDC interference problem occurs is the non-serving cell, after the second period expires, receiving a message including the third interference situation information from the terminal;

   And the second period is a period longer than the first period.
8. The method of claim 5,

   If the cell having the IDC interference problem is the serving cell and the non-serving cell, after the first period expires, a message including the third interference situation information of the serving cell or the non-serving cell is received from the terminal. The method further comprises the step.
9. Receiving unit for receiving a message from the base station;

   A controller for identifying an in-device coexistence interference (IDC) interference problem and identifying a cell in which the interference problem occurs; And

   A transmitter which transmits a message including the interference situation information generated by the controller,

   When the control unit identifies the IDC interference problem and the cell in which the IDC interference problem occurs is a serving cell, the controller operates a first prohibit timer, and the control unit expires the first prohibit timer. After checking the IDC interference problem of the serving cell to control the transmitter to transmit a message including the second interference situation information,

   The controller may be configured to operate the first prohibit timer for the non-serving cell when the cell in which the IDC interference problem occurs includes a non-serving cell or to distinguish the second prohibit timer from the first prohibit timer. Terminal for operating the prohibit timer or do not operate the prohibit timer.
10. The method of claim 9,

    When the cell in which the IDC interference problem occurs is the non-serving cell, the controller determines whether the IDC interference problem for the non-serving cell is solved and controls the transmitter to transmit a message including third interference situation information.
11. The method of claim 9,

    When the cell in which the IDC interference problem occurs is the non-serving cell, the controller operates the second prohibit timer, and after the second prohibit timer expires, the controller determines an IDC interference problem for the non-serving cell and transmits the result. And transmit a message including third interference situation information, wherein the second prohibit timer is longer than the first prohibit timer.
12. The method of claim 9,

    When the cell in which the IDC interference problem occurs is the serving cell and the non-serving cell, the controller checks the IDC interference problem of the serving cell or the non-serving cell after the first prohibit timer expires, and the transmitter determines a third time. Terminal for controlling to transmit a message containing the interference situation information.
13. A transmitter for transmitting a message to the terminal;

    A receiver which receives a message including interference situation information from the terminal; And

    A control unit for controlling the transmitter and the receiver;

    The receiving unit receives a message including the first interference situation information from the terminal confirming the in-device coexistence interference (IDC) interference problem, and if the cell in which the IDC interference problem occurs is a serving cell, After the expiration of one period, a message including second interference situation information is received from the terminal;

    The receiver may further include third interference from the terminal after a period distinct from the first period or the first period with respect to the non-serving cell when the cell in which the IDC interference problem occurs includes a non-serving cell. A base station for receiving the status information.
14. The method of claim 13,

    When the cell in which the IDC interference problem occurs is the non-serving cell, the receiving unit receives a message including the third interference situation information from the terminal confirming the solution of the IDC interference problem for the non-serving cell. Base station.
15. The method of claim 13,

    When the cell in which the IDC interference problem occurs is the non-serving cell, the receiving unit receives a message including the third interference situation information from the terminal after a second period expires, and the second period is the first period. A base station characterized by a period longer than a period.
16. The method of claim 13,

    When the cell in which the IDC interference problem occurs is the serving cell and the non-serving cell, the receiving unit sends a message including the third interference situation information of the serving cell or the non-serving cell after the first period expires. Base station, characterized in that receiving from the terminal.

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