KR20130126440A - Apparatus and method for controling in-device coexistence interference in wireless communication system - Google Patents

Abstract

A method and apparatus for controlling in-device coexistence interference (IDC) in a wireless communication system is provided. According to the present invention, the measurement is performed on the neighboring cell when all the frequency bands set by the measurement setting are greater than or equal to a predetermined reference value, and the IDC influence on the measured sample is performed. Transmits a measurement result report including a measurement result to which the IDC is in progress and an unusable frequency that is in progress and difficult to perform wireless communication to the base station, wherein the unusable frequency is associated with the serving cell within the frequency band set by the measurement setting. And performing an IDC resolution operation based on whether the frequency is a serving frequency.

Description

Apparatus and method for controlling in-device coexistence interference in a wireless communication system {APPARATUS AND METHOD FOR CONTROLING IN-DEVICE COEXISTENCE INTERFERENCE IN WIRELESS COMMUNICATION SYSTEM}

The present invention relates to a wireless communication system, and more particularly, to an apparatus and method for controlling in-device coexistence interference in a wireless communication system.

Wireless communication systems generally use one bandwidth for data transmission. For example, a second-generation wireless communication system uses a bandwidth of 200 KHz to 1.25 MHz, and a third-generation wireless communication system uses a bandwidth of 5 MHz to 10 MHz. To support increasing transmission capacity, the recent 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) or Institute of Electrical and Electronics Engineers (IEEE) 802.16m continues to expand its bandwidth to 20 MHz or more. Increasing the bandwidth to increase the transmission capacity is essential, but supporting large bandwidths even at low levels of required services can result in large power consumption.

Accordingly, a multiple component carrier system has emerged, which defines a carrier having one bandwidth and a center frequency and enables data to be transmitted or received over a wide band through a plurality of carriers. By using one or more carriers, both narrow and wide bandwidths are supported simultaneously. For example, if one carrier corresponds to a bandwidth of 5 MHz, four carriers support a maximum bandwidth of 20 MHz.

Today's ubiquitous access network allows users to connect to different networks in different regions and maintain connectivity anywhere. A user in which one terminal communicates with one network system carries different devices supporting each network system. However, in recent years, as the functions of a single terminal have been advanced and complicated, communication with multiple network systems can be performed simultaneously with only one terminal, and user convenience has been increased.

However, in the case where one terminal communicates simultaneously on multiple network system bands, in-device coexistence interference may occur. In-device coexistence interference refers to interference when transmission in one frequency band interferes with reception in another frequency band in the same terminal. For example, when a terminal simultaneously supports a Bluetooth system and an 802.16 system, in-device coexistence interference may occur between the Bluetooth system band and the 802.16 system band. In-device co-existence interference can occur mainly when the spacing between frequency band boundaries of heterogeneous network systems is not wide enough.

However, in the current wireless communication system, a specific method for coordinating in-device coexistence interference has not been determined. In other words, there is a need for a procedure regarding an operation for resolving in-device coexistence interference between a terminal and a base station.

An object of the present invention is to provide an apparatus and method for controlling coexistence interference in a device.

Another technical problem of the present invention is to provide a method and apparatus for transmitting information supporting control of coexistence interference in a device.

Another technical problem of the present invention is to provide a method and apparatus for setting a measurement for controlling coexistence interference in a device.

Another technical problem of the present invention is to provide a method and apparatus for controlling in-device coexistence interference based on whether an unusable frequency band is a serving frequency.

Another technical problem of the present invention is to provide a method and apparatus for transmitting except for TDM support information as IDC support information.

According to an aspect of the present invention, a method for controlling in-device coexistence interference (IDC) by a terminal in a wireless communication system includes a measurement result for a main serving cell greater than a predetermined reference value for all frequency bands set by measurement setting. Or performing a measurement on the neighboring cell if the same; Transmitting to the base station a measurement result report including a measurement result of removing IDC influence from the measurement sample in which the measurement is performed and an unusable frequency which is a frequency that is in progress and difficult to perform wireless communication; And performing an IDC resolution operation based on whether the unusable frequency is a serving frequency, which is a frequency associated with a serving cell, within a frequency band set by the measurement setting.

According to another aspect of the present invention, in a wireless communication system, a terminal for controlling in-device coexistence interference when the measurement result for the main serving cell is greater than or equal to a predetermined reference value for all frequency bands set by the measurement setting. A measuring unit which measures a neighbor cell; A transmission unit for transmitting a measurement result report including a measurement result of removing IDC influence from the measurement sample in which the measurement is performed and an unusable frequency which is a frequency in which IDC is in progress, making it difficult to perform wireless communication; And a controller for performing an IDC resolution operation based on whether the unusable frequency is a serving frequency which is a frequency associated with a serving cell within a frequency band set by the measurement setting.

According to another aspect of the present invention, a method for controlling in-device coexistence interference by a base station in a wireless communication system includes, for all frequency bands set by the measurement setting, a measurement result for a main serving cell is greater than a predetermined reference value or In the same case, the method comprising: receiving from the terminal a measurement result report including a measurement result of removing IDC influence from a measurement sample for measuring a neighbor cell and an unusable frequency which is a frequency in which IDC is in progress, making it difficult to perform wireless communication; And determining an IDC resolution operation based on whether the unusable frequency is a serving frequency which is a frequency associated with a serving cell within a frequency band set by the measurement setting.

According to the present invention, a procedure for resolving IDC can be distinguished according to whether an IDC supporting information triggering situation is a serving frequency or a non-serving frequency, and receives an IDC control operation by receiving TDM pattern information about a serving frequency or a non-serving frequency. It can be applied to other communication problems.

1 illustrates a wireless communication system to which an embodiment of the present invention is applied.
2 is an explanatory diagram for explaining in-device coexistence interference applied to the present invention.
3 shows an example of in-device coexistence interference from an ISM transmitter to an LTE receiver according to the present invention.
4 shows an example in which an ISM band and an LTE band are divided on a frequency band.
5 is an explanatory diagram illustrating an example of mitigating in-device coexistence interference using an FDM scheme according to the present invention.
6 is an explanatory diagram showing another example of mitigating in-device coexistence interference using an FDM scheme according to the present invention.
7 and 8 are explanatory diagrams showing an example of mitigating in-device coexistence interference using a power control scheme according to the present invention.
9 is an explanatory diagram showing an example of mitigating in-device coexistence interference by using a TDM scheme applied to the present invention.
10 shows transmission / reception timings on the time axis of the LTE band and the ISM band which controlled in-device coexistence interference according to the TDM scheme.
11 illustrates another example of mitigating in-device coexistence interference by using a TDM scheme according to the present invention.
12 is a diagram illustrating another example of mitigating in-device coexistence interference using a TDM scheme applied to the present invention.
FIG. 13 is a diagram illustrating another example of mitigating in-device coexistence interference by using a TDM scheme applied to the present invention.
14 and 15 show an example of a DRX operation applied to the present invention.
FIG. 16 is a diagram illustrating a case where a terminal receives an interference signal in a device according to the present invention.
17 is a flowchart illustrating an example of in-device coexistence interference control performed between a base station and a terminal according to the present invention.
18 is a diagram illustrating a situation in which the S-measurement reference value is changed according to the present invention.
19 is a diagram illustrating a measurement setting applied to the present invention.
20 is a view for explaining an example of a method of obtaining a measured value with the IDC influence removed according to the present invention.
21 is a diagram illustrating another example of a method for obtaining a measured value with the IDC influence removed according to the present invention.
22 is a flowchart illustrating another example of in-device coexistence interference control performed between a base station and a terminal according to the present invention.
23 is a flowchart illustrating another example of in-device coexistence interference control performed between a base station and a terminal according to the present invention.
24 is an example of a flowchart illustrating an operation of a terminal performing IDC control according to the present invention.
25 is an example of a flowchart illustrating an operation of a base station for performing IDC control according to the present invention.
26 is a block diagram illustrating a terminal and a base station for performing IDC control according to the present invention.

Hereinafter, some embodiments will be described in detail with reference to 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 the following description of the embodiments 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 disclosure rather unclear.

In describing the components of the present specification, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected or connected to that other component, but there is another component between each component. It will be understood that may be "connected", "coupled" or "connected".

1 illustrates a wireless communication system to which an embodiment of the present invention is applied.

Referring to FIG. 1, a wireless communication system is widely deployed to provide various communication services such as voice and packet data, and includes a user equipment (UE), a base station 20 (evolved NodeB, eNB), and a WLAN access point. (Wireless LAN Access Point: AP, 30), GPS (Global Positioning System, 40) satellite. Herein, the wireless LAN access point (or wireless LAN) is a device supporting IEEE (Institute of Electrical and Electronics Engineers) 802.11 technology, and IEEE 802.11 can be mixed with a WiFi system.

The terminal 10 may be located within the coverage of multiple networks such as cellular networks, wireless LANs, broadcast networks, satellite systems, and the like. The terminal 10 has a plurality of wireless transceivers for accessing various networks and various services regardless of time and place. For example, a smart phone has a Long Term Evolution (LTE), WiFi, Bluetooth (BT) transceiver and a GPS receiver. As such, the design of the terminal 10 is becoming more complex in order to integrate more and more transceivers into one and the same terminal 10 while maintaining good performance. As a result, in-device coexistence interference (IDC interference) is more likely to occur.

Hereinafter, downlink (DL) means communication from the base station 20 to the terminal 10, and uplink (UL) means communication from the terminal 10 to the base station 20. In downlink, the transmitter may be part of the base station 20 and the receiver may be part of the terminal 10. In addition, in uplink, the transmitter may be part of the terminal 10 and the receiver may be part of the base station 20.

The terminal 10 may be fixed or mobile and may be referred to by other terms such as a Mobile Station (MS), a User Terminal (UT), a Subscriber Station (SS), a Mobile Terminal (MT) . The base station 20 is a fixed station that communicates with the terminal 10 and includes a base station (BS), a base transceiver system (BTS), an access point, a femto base station (Femto BS) (relay).

There are no restrictions on multiple access schemes applied to wireless communication systems. (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA , OFDM-CDMA, and the like.

2 is an explanatory diagram for explaining in-device coexistence interference applied to the present invention.

Referring to FIG. 2, the terminal 10 includes an LTE RF 11, a GPS RF 12, and a Bluetooth / WiFi RF 13. Transmit and receive antennas 14, 15, and 16 are connected to each radio frequency (RF). That is, several kinds of RFs are closely mounted in one device platform. Here, the transmit power of one RF may be much greater than the receive power level to another RF receiver. If the frequency spacing between RFs is not sufficient and the filtering technique is not supported, then a transmission signal of one RF may cause significant interference to a receiver of another RF in the device. For example, "A" of FIG. 2 is an example of a path in which the transmission signal of the LTE RF 11 causes in-device coexistence interference with respect to the GPS RF 12 and the Bluetooth / WiFi RF 23, and the "B". Is an example of a path in which a transmission signal of the Bluetooth / WiFi RF 23 causes in-device coexistence interference with respect to the LTE RF 21.

3 illustrates an example of in-device coexistence interference from an ISM (Industrial, Scientific and Medical) transmitter to an LTE receiver according to the present invention. ISM transmitter refers to a transmitter that transmits in the ISB band, a band that can be freely used without a license in the industrial sciences and medical field.

Referring to FIG. 3, it can be seen that the band of the signal received at the LTE receiver overlaps the band of the transmission signal of the ISM transmitter. In this case, in-device coexistence interference may occur. In particular, when receiving a signal through the LTE receiver in the frequency bands F1 to F3, F2 and F3 indicates that the unacceptable interference occurs in the LTE receiver due to the ISM transmitter. Here, F1 to F3 may be frequency bands belonging to one band. However, F1 exists in a band outside the region affected by In-Device Coexistence (IDC), and F2 and F3 belong to the region affected by IDC. That is, within one band, the degree of coexistence interference problem may vary between frequency bands according to the characteristics of a band filter.

4 shows an example in which an ISM band and an LTE band are divided on a frequency band.

Referring to FIG. 4, band 40, band 7, and band 38 are LTE bands. Band 40 occupies 2300-2400 MHz band in TDD mode, uplink occupies 2500-2570 MHz band in FDD mode, and downlink occupies 2620-2690 MHz in band 7. Band 38 occupies 2570-2620 MHz band in TDD mode. Meanwhile, the ISM band is used as a Wi-Fi channel and a Bluetooth channel and occupies 2400 to 2483.5 MHz. Here, the situation in which coexistence interference occurs in the device is shown in Table 1 below.

Interference band Form of interference Band 40 ISM Tx-> LTE TDD DL Rx Band 40 LTE TDD UL Tx-> ISM Rx Band 7 LTE FDD UL Tx-> ISM Rx Band 7/13/14 LTE FDD UL Tx-> GPS Rx

Referring to Table 1, the notation 'a-b' in the form of interference indicates a situation in which transmitter a causes coexistence interference in a device to receiver b. In band 40, the ISM transmitter causes in-device co-existence interference to the downlink TDD receiver (LTE DL TDD Rx) of the LTE band. A filtering scheme can mitigate some of the coexistence interference in the device, but it is not enough. In addition to the filtering scheme, the application of frequency division multiplex (FDM) scheme can more effectively mitigate in-device coexistence interference.

5 is an explanatory diagram illustrating an example of mitigating in-device coexistence interference using an FDM scheme according to the present invention.

Referring to FIG. 5, the LTE band may be moved in the arrow direction (to the left in the frequency band axis) so that the LTE band does not overlap with the ISM band. This results in handover of the terminal from the ISM band. However, this requires a method in which legacy measurement or new signaling accurately triggers a mobility procedure or radio link failure (RLF) procedure. Alternatively, there may be a method of avoiding a problem in the LTE band with the ISM through filtering or resource allocation. Alternatively, when LTE carrier aggregation is used, overlapping interference may be avoided through a procedure of reconfiguring a set of carriers to be used.

6 is an explanatory diagram showing another example of mitigating in-device coexistence interference using an FDM scheme according to the present invention.

Referring to FIG. 6, the ISM band may be reduced and moved in the direction of the arrow (to the right in the frequency axis) to be separated from the LTE band. In this way, backward compatibility problems may occur. In the case of Bluetooth, the backward compatibility problem may be solved to some extent due to the adaptive frequency hopping mechanism. However, in the case of Wi-Fi, the backward compatibility problem is solved. This can be difficult.

7 and 8 are explanatory diagrams showing an example of mitigating in-device coexistence interference using a power control (PC) scheme according to the present invention.

Referring to FIG. 7, the terminal may lower the transmission power of the LTE signal to a certain level to avoid in-device coexistence interference to improve reception quality of the ISM band. Referring to FIG. 8, the terminal may uniformly transmit the transmission power of the ISM band. By lowering the level, the reception quality of the LTE signal can be improved by avoiding in-device coexistence interference.

9 is an explanatory diagram illustrating an example of mitigating in-device coexistence interference by using a time division multiplexing (TDM) method applied to the present invention.

Referring to FIG. 9, if the reception time of the LTE signal is changed so as not to overlap with the transmission time in the ISM band, in-device coexistence interference may be avoided. For example, if a signal of the ISM band is transmitted at t ₀ , the LTE signal is received at t ₁ .

10 shows transmission / reception timings on the time axis of the LTE band and the ISM band which controlled in-device coexistence interference according to the TDM scheme.

Referring to FIG. 10, it can be seen that in-device coexistence interference can be avoided by the TDM scheme as shown in FIG. 9 without moving between the LTE band and the ISM band.

11 illustrates another example of mitigating in-device coexistence interference by using a TDM scheme according to the present invention.

Referring to FIG. 11, as a TDM scheme based on discontinuous reception (DRX), a pattern periodicity section is a scheduled period section and an unscheduled period section. Splitting can avoid in-device coexistence interference. The UE prevents LTE from transmitting within the unscheduled period to avoid mutual interference between the LTE and the ISM, but the main LTE transmission such as random access or hybrid automatic repeat request (HARQ) retransmission is scheduled. Even within a defined period of time may be allowed. The UE prevents the transmission of the ISM within the scheduled period and allows the transmission of the LTE to avoid mutual interference between the LTE and the ISM. As with the unscheduled period, the main transmission of the ISM band such as Beacon or Wi-Fi may be allowed within the scheduled period. LTE transmission may be prevented to protect the main transmission of the ISM band. In addition, special signaling may be added to protect the main transmission of the ISM band such as a beacon. For example, information on a period of the beacon signaling and a subframe offset may be added. In this case, the subframe offset number and the system frame number may be determined based on "0". The system frame number is one of "0" to "1023" in units of radio frames in the LTE system. Since one radio frame consists of 10 subframes, the UE can know the exact frame position in the system through the subframe offset number and the system frame number.

12 is a diagram illustrating another example of mitigating in-device coexistence interference using a TDM scheme applied to the present invention.

Referring to FIG. 12, as an autonomously denial method to which the TDM scheme is applied, LTE transmission is arbitrarily rejected to protect ISM reception when in-device coexistence interference occurs. In FIG. 12, a checkmarked part means that transmission or reception is approved, and an X-marked part (X) means that transmission or reception is denied. Even if the LTE UL transmission is granted from the base station, the terminal may not perform the LTE UL transmission by denying the grant to protect the ISM reception. Similarly, ISM transmission can be rejected to protect LTE reception. By reducing the ISM transmission power level, reception quality in LTE can be improved.

FIG. 13 is a diagram illustrating another example of mitigating in-device coexistence interference by using a TDM scheme applied to the present invention.

Referring to FIG. 13, as a partial autonomously denial scheme using a TDM scheme, when downlinking ISM transmission in preparation for difficulty in LTE reception of a terminal due to occurrence of IDC interference, a physical downlink (PDCCH) It is a method of partially rejecting ISM transmission of a subframe based on a control channel).

When the UE receives the PDCCH region of LTE, in principle, the UE rejects ISM transmission. However, if there is no downlink resource allocation in the subframe region indicated by the PDCCH based on the PDCCH region, there is no need to deny ISM transmission for the subframe region and the ISM transmission is allowed. Here, the PDCCH region means a region in which a resource region including control information such as resource allocation or grant information and a region necessary for decoding the control information are added together. In case of LTE, it means the sum of the number of OFDM symbols used for PDCCH transmission transmitted by a Physical Control Format Indicator Channel (PCFICH) and the size of a region required for decoding the PDCCH in the UE. In this case, the size of the region required for decoding the PDCCH may vary depending on the implementation of the UE, but may not be larger than one subframe.

Referring to FIG. 13, ISM transmission may be rejected in each of the PDCCH regions 1300, 1310, 1320, 1330, 1340, 1350, 1360, and 1370. In addition, the UE is a non-PDCCH region (non-PDCCH, 1305, 1315, 1325, 1335, 1345, 1355) which is a subframe indicated by the PDCCH regions 1300, 1310, 1320, 1330, 1340, 1350, 1360, and 1370, respectively. It is determined whether downlink resource allocation exists at 1365 and 1375. Downlink resource allocation exists in the non-PDCCH regions 1315, 1335, 1345, and 1355, but no downlink resource allocation exists in the non-PDCCH regions 1305, 1325, 1365, and 1375. Thus, only some non-PDCCH regions 1315, 1335, 1345, and 1355 partially reject ISM transmissions. ISM transmission is allowed for the other non-PDCCH regions 1305, 1325, 1365, and 1375.

14 and 15 show an example of a DRX operation applied to the present invention.

Referring to FIG. 14, a DRX cycle (DRX cycle) 1400 refers to a cycle in which a DRX operation is performed. As an example, there is a long DRX cycle applied in a range between 10 subframes and 2560 subframes. Another example is a short DRX cycle applied in a range of 2 subframes to 640 subframes. At this time, the DRX cycle is applied only while the DRX short cycle timer (drxShortCycleTimer) is operated, and the same long DRX cycle is applied to the range outside the DRX short cycle timer. Here, in the DRX short cycle timer, one short DRX cycle becomes a basic unit. That is, if the length of the short DRX cycle is 10, the time becomes "10 * drxShortCycleTimer". At this time, the length of the short DRX cycle is 1 to 16.

Active time (1405) means the total time that the terminal wakes up and receives the PDCCH. Activity time means the time that the on-duration timer (1415) of the terminal is running, DRX inactivity timer (drx-InactivityTimer, 1420), DRX retransmission timer (drx-RetransmissionTimer, 1425) or MAC contention It may be a time further including a time that a timer such as a resolution timer (mac-ContentionResolutionTimer) 1430 is running.

The non-active time 1410 refers to a time other than the active time 1405 of the DRX cycle 1400.

The timer unit of the DRX timer, such as the duration timer 1415, the DRX inactivity timer 1420, or the DRX retransmission timer 1425, is a PDCCH-subframe (psf). That is, DRX timers are signaled or operated on a PDCCH-subframe basis. Here, the PDCCH-subframe means a subframe including the PDCCH. For example, in a TDD configuration, DL subframes and Downlink Pilot Time Slot (DwPTS) subframes correspond to PDCCH-subframes. A subframe configured but not suspended for a relay node (RN) corresponds to a PDCCH-subframe.

Referring to FIG. 15, while the duration interval 1515 of the DRX cycle 1500 is operating, the DRX command MAC CE becomes an active time 1505 unless a DRX command MAC control element 1550 is received. Receiving command MAC CE 1550, duration timer 1515 stops, resulting in non-activity time 1510. The length of the duration period 1515 may be psf1 to psf200, that is, one PDCCH-subframe to 200 PDCCH-subframes.

The DRX inactivity timer starts when it receives a PDCCH indicating a new transmission and stops when it receives a DRX command MAC CE.

The DRX retransmission timer starts if data decoding in a corresponding HARQ procedure is not successfully performed within a HARQ round trip time (RTT). When the PDCCH containing the grant message is received for the process, the DRX retransmission timer stops.

FIG. 16 is a diagram illustrating a case where a terminal receives an interference signal in a device according to the present invention. It is classified into seven cases based on the frequency of interference and the strength or power.

Referring to FIG. 16, when the seven cases are classified into four patterns based on the frequency of the interference, case 1 and case 2 are continuous, case 3 and case 4 are frequent, case 5 and Case 6 are sparse, and Case 7 is a pattern of none.

When the seven cases are classified into three patterns based on the intensity of the interference, Case 1, Case 3, and Case 5 are very strong, Case 2, Case 4, and Case 6 are sufficiently weak, Case 7 is a pattern of none.

For example, the case where the terminal determines that the IDC is in progress (on-going IDC, hereinafter called IDC in progress) may be Case 1 and Case 3. The cases are at least a case where the interference is continuous or frequent and is very strong.

On the other hand, a condition that does not correspond to the IDC process but the in-device co-existence interference occurs and the possibility that the in-device co-existence interference is changed to the ongoing state is defined as "the presence of potential in-device co-existence interference" (hereinafter referred to as potential IDC) Is called).

For example, the terminal may determine that case 2, case 4, case 5, and case 6 of FIG. 16 are potential IDC generation. As another example, the terminal may determine that only case 5 having a strong strength is capable of generating potential IDC. Handover, RRC setting / resetting, etc. are not impossible in the potential IDC possible frequency band, and the UE may perform measurement.

As another example, the case where it is determined that the IDC is in progress may be cases 1, 2, 3 and case 4. The cases are cases where interference is continuous or frequent. This is the case where the strength of the interference is not taken into account.

Meanwhile, according to the definition of the above embodiment, cases 5 and 6 may be defined as "in the presence of potential in-device coexistence interference".

As another example, whether IDC is in progress may include interference between IDC and cells (for example, interference of co-channel serving and non-serving cells of the same channel and adjacent channel interference). ), Etc.) and thermal noise can be considered. In other words, IDC, inter-cell interference, adjacent channel interference, and thermal noise may be defined as the IDC in progress for a strong and frequent case. For example, in the case of considering only IDC in FIG. 16, even in case 2 or case 4, IDC may be in progress when cell-to-cell interference, adjacent channel interference, thermal noise, etc. are considerably large.

Now, in accordance with the present invention, a method of controlling in-device coexistence interference is described. Hereinafter, an operation of reducing, avoiding, or removing interference is collectively referred to as interference control, interference coordination, or interference solution.

17 is a flowchart illustrating an example of in-device coexistence interference control performed between a base station and a terminal according to the present invention.

Referring to FIG. 17, the terminal transmits UE capability information to the base station (S1700). In this case, the performance information of the terminal may be transmitted through an RRC message.

The performance information of the terminal includes information on IDC assistant information configuration capability or a frequency band in which IDC may exist (hereinafter, referred to as "IDC existence frequency band"). In addition, the performance information of the terminal may include information of the frequency band during the IDC progress. The IDC support information configuration capability is also called IDC capability and may be 1-bit bitmap information.

The IDC assistant information configuration capability is a terminal capable of constructing and transmitting IDC assistant information to a base station (or a version capable of performing such a function (eg, the versions of the terminal and the base station are Release 9 and Release 10, respectively). Or release 11, etc. Therefore, all or part of the information about the IDC support information configuration capability is not transmitted to the base station, or information indicating that there is no IDC support information configuration capability (for example, the corresponding information). If the field or the indicator is set to disable (disable) is transmitted to the base station, the base station does not instruct the terminal to perform the operation related to the IDC assistance information.

The IDC existence frequency band refers to frequency band information that may be an unusable frequency. here. The unusable frequency refers to a frequency in which IDC is on-going IDC and thus it is difficult to perform wireless communication in the corresponding frequency band.

For example, a terminal with WiFi turned off does not generate IDC at all when LTE is initially connected, but when WiFi is turned on, band 40 is likely to be an unusable frequency due to IDC progress, and thus band 40 is likely to have IDC. It is determined to be a frequency band.

In this case, the IDC available frequency band is referred to as a potential IDC problematic frequency (hereinafter, referred to as a potential IDC problematic frequency band) in which an IDC problem can potentially occur according to not only the IDC ongoing frequency band but also the equipment configuration of the terminal. ) Is also included. In other words, the IDC is not necessarily generated at the moment of transmitting the performance information of the terminal.

The IDC available frequency band may be indicated (or expressed) using an E-UTRA Absolute Radio Frequency Channel Number (EARFCN). Here, EARFCN divides and assigns a number of operable frequency bands of E-UTRA (Evolved-Universal Terrestrial Radio Access).

For example, the performance information of the terminal may include all EARFCN values of IDC available frequency band.

As another example, the performance information of the terminal may include the EARFCN corresponding to the boundary value of the IDC available frequency band. The bound value may be an upper bound or a lower bound. Whether the threshold value is the maximum threshold value or the minimum threshold value is predetermined and set in the terminal and the base station, or an indicator (hereinafter, referred to as a boundary type indicator) indicating whether the threshold value is the maximum threshold value or the minimum threshold value is the terminal. The type of the boundary value may be implicitly determined based on the number of operating bands to which the EARFCN corresponding to the boundary value is transmitted or transmitted in addition to the performance information. For example, for band 7 and band 41 having different operating band numbers and duplexing schemes but having the same frequency band, a threshold value (or type of threshold value) may be determined based on the number of operating bands.

As another example, an operating band affected by a frequency band indicated by EARFCN included in the performance information of the terminal may be indicated. Here, the operating band is indicated refers to an indication of an operating band unit rather than a frequency band. If there are a plurality of operating bands affected by the frequency band indicated by the EARFCN, all of the plurality of operating bands may be indicated.

On the other hand, if the performance information of the terminal does not include the IDC support information configuration capability information, but only the IDC available frequency band information, the base station (or network) is not likely to generate IDC to the terminal need to transmit the IDC support information It may be judged that there is no. That is, it operates similarly to the case where the IDC support information configuration capability is disabled (or non-supported). Disable is the opposite of the IDC support information enable described below.

Meanwhile, the performance information of the terminal may include information regarding the type and type of another communication system capable of generating IDC in the terminal. Here, the type of communication system may be at least one of a wireless local area network (WLAN), a Bluetooth (BT), or a Global Navigation Satellite System (GNSS). Here, the type of the communication system may be at least one of a type used for the voice communication, a type used by a streaming service such as multimedia video on demand (VOD), or a type used for offloading. have.

Following step S1700, the base station transmits an RRC connection reconfiguration message to the terminal to perform RRC connection reconfiguration (S1705).

The base station may allow transmission of IDC assistance information of the terminal to an enable state (or also called an enable state) through the RRC connection reconfiguration. This is called IDC assistant information enable, or IDC support enable. That is, IDC assistance information enable information (or IDC assistance information enable indicator) may be signaled through the RRC connection reconfiguration message. The IDC assistant information enable indicator may be bitmap information consisting of 1 bit. When the IDC assistant information enable is delivered to the terminal, the base station allows the terminal to transmit IDC assistance information for generation of IDC, and if the IDC assistant information enable is not delivered to the terminal, the base station does not allow the transmission of the IDC assistance information. That is, the terminal does not configure and transmit the IDC support information unless it receives the IDC support information enable indicator.

For example, if the terminal has the capability to perform the IDC-related operation, but the base station has no capability to perform the IDC-related operation, even if the performance information of the terminal is delivered to the base station, the IDC assistance information enable is not signaled by the base station.

On the other hand, the base station may set the frequency for performing the measurement of the terminal through the RRC connection reset. This is also called measurement configuration. The measurement setting is set based on a plurality of measurement IDs. One measurement ID is associated with one measurement object and one report configuration information. A measurement object is a blacklisted cell (a region that includes a measurement bandwidth, a measurement frequency, or a center frequency) and a cell that cannot be measured at that measurement frequency. information including the cell and the list of cells to be measured. Report setting information means information including information on the purpose and method of the measurement report. When the measurement report method is an event trigger method, an event A1 to an event A6 or an event B1 to an event B2 may be determined.

Here, in relation to a cell in which measurement setting is performed for a terminal supporting carrier aggregation, a serving cell refers to a main serving cell and one or more secondary serving cells, and a neighboring cell is measured. ID refers to all cells other than the cells targeting in the measurement area (eg, including measurement bandwidth or measurement frequency) referred to by the corresponding measurement object. The targeting cell may be a main serving cell or a serving cell. Each targeting cell is determined differently according to the report setting information associated with the corresponding measurement ID. For example, in the case of the A1, A2, and A3 events, the targeting cell is the main serving cell, and in the case of the A6 event, the secondary serving cell.

Also, a listed cell (hereinafter referred to as a list cell) refers to a cell listed in a measurement object, and the detected cells are not cells listed in the measurement object. The cell sensed by the terminal at the carrier frequency indicated by the measurement object. A black listed cell (hereinafter referred to as a black list cell) refers to a cell excluded from a measurement report in a measurement object. Excluded from the measurement report means that the cell is not evaluated and the measurement result is not reported. Not performing an evaluation of the measurement results means that the measurement does not perform a mechanism to compare the measurement results with a threshold for a report trigger. Here, the measurement object means an object for performing the measurement. The object includes one carrier band and includes a measurement offset, a black list cell and a list cell of the carrier band. In E-UTRA, the UE measures and reports the serving cell, the list cell, and the sensed cell except the black list cell.

Based on the measurement setting, the terminal may perform IDC assistance information triggering and transmit IDC assistance information. That is, the measurement setting may be related to a frequency band in which IDC assistance information triggering is performed or an unusable frequency band in IDC assistance information.

On the other hand, the frequency linked to the serving cell (main serving cell or secondary serving cell) in the total frequency band measured (that is, all the measurement areas set by the measurement set) is called a serving frequency, and is measured within the total frequency band measured. In the non-serving frequency (that is, the frequency band that is measured in the terminal but not serviced) is referred to as a non-serving frequency. There are a list cell, a black list cell, and a sensed cell in the serving frequency, and there is a serving frequency in the serving cell. For example, if the measured EARFCN value of the set frequency is 1,2,3,4,5, the EARFCN value of the frequency associated with the main serving cell is 3 and the EARFCN value of the frequency associated with the secondary serving cell is 4,5 The EARFCN value of the frequency is 3,4,5 and the EARFCN value of the non-serving frequency is 1,2.

Hereinafter, the description of the serving cell (or non-serving cell) is based on frequency. For example, the EARFCN value corresponding to the boundary value of the unusable frequency band is determined only within the serving frequency range, which is the frequency set by the measurement setup.

On the other hand, in the measurement setting, the measurement setting is performed for the frequency band (for example, f1, f2) set for the measurement result report, but the frequency band is not set for the measurement result report, but the terminal can detect (detection) Measurement setup may not be performed for a frequency band (eg, f3) that may be present. The terminal may generate and transmit IDC assistance information only for the f1 and f2, and may not generate or transmit the IDC assistance information for f3.

The RRC connection reconfiguration message may also include a measurement report configuration, and a measurement ID may be set differently for each event that is a triggering condition such as an A3 event or an A6 event.

Meanwhile, the RRC connection reconfiguration message may include configuration information about a candidate frequency of IDC assistant information triggering.

In addition, the RRC connection reset message may include information for setting to limit the IDC assistance information triggering.

In addition, the RRC connection reconfiguration message may include IDC prohibit timer related information that is set in the terminal to prevent the frequent triggering is performed by the IDC that changes from time to time. The terminal that detects the occurrence of IDC and transmits the interference information does not transmit the interference information to the base station even when the occurrence of the IDC is detected again during the operation of the cutoff timer. This is for the terminal to prevent frequent transmission of interference information due to IDC generation and to prevent waste of uplink transmission resources. The terminal may stop (or prohibit or block) the transmission of the IDC assistant information by the cutoff timer for a predetermined time. The cutoff timer may be controlled by a network (or a base station), and the length of the cutoff timer may be transmitted to the terminal through the RRC connection reconfiguration message. A blocking timer may be set differently for each serving cell, or one blocking timer may be set for one terminal. When one cutoff timer is set in one terminal, the same cutoff timer is set and used in all serving cells.

Subsequently to step S1705, the UE performs IDC assistance information triggering (hereinafter referred to as IDC triggering) based on the IDC triggering condition (S1710). That is, it triggers the transmission of IDC assistance information. The IDC triggering may be performed simultaneously with the measurement, the measurement may be performed before the IDC triggering, or the IDC triggering may be performed before the measurement.

For example, IDC triggering may be performed based on IDC on-going IDC of the terminal according to the determination within the terminal. That is, the IDC triggering condition may be whether IDC is in progress as described above with reference to FIG. 16, and a determination criterion may be based on a determination inside the terminal.

As another example, IDC triggering may be performed according to an internal implementation of the terminal as to whether or not the communication may be experienced by the IDC situation. In this case, the IDC triggering condition according to the internal determination of the UE may be set based on a test case, IDC interference strength and activity, a packet error rate, or a measurement result. Here, IDC activity refers to an indicator of how often IDC occurs in time. For example, IDC activity may be defined as a ratio of a subframe in which IDC does not occur and a subframe in which IDC occurs. As an example, there is a method of obtaining an average value based on each subframe weight.

Meanwhile, as an example, the frequency band in which IDC triggering occurs may be a frequency band associated with a serving cell (main serving cell or secondary serving cell) among frequency bands measured by the RRC connection resetting (in step S1705). That is, IDC triggering may occur at the serving frequency.

As another example, the terminal may include a frequency band that is set to the terminal but not receiving a service. IDC triggering can occur at non-serving frequencies.

Following step S1710, the terminal transmits IDC assistance information to the base station (S1715). IDC assistance information is also called IDC indication information or IDC indication. At this time, if the measurement result (measurement result) measured in the terminal may be transmitted together.

The IDC support information may include unusable frequency band information for an FDM-based IDC solution or may include TDM pattern information for a TDM-based IDC solution.

The IDC assistance information may include unusable frequency band information. The unusable frequency band may mean an IDC ongoing frequency band or may include a potential IDC capable frequency band as well as an IDC ongoing frequency band. .

For example, the IDC assistant information may include all EARFCN values of an unusable frequency band.

As another example, the IDC assistance information may include all EARFCN values of the unusable frequency band within the total frequency band set by the measurement report.

As another example, the IDC support information may include an EARFCN corresponding to the minimum boundary value, and a frequency band larger than the minimum boundary value is used within a band (operating band) in which the corresponding EARFCN is included. It may indicate that the frequency is disabled. Alternatively, the IDC assistant information may include an EARFCN corresponding to the maximum boundary value, and indicate that a frequency band smaller than the maximum boundary value is an unusable frequency in a band (operation band) in which the corresponding EARFCN is included. can do. In this case, it is determined whether the EARFCN included in the IDC support information is the maximum boundary value or the minimum boundary value, or an indicator (boundary type indicator) indicating whether the EARFCN is the maximum boundary value or the minimum boundary value is the IDC support information. The type of the boundary value may be implicitly determined based on the number of operating bands to which the EARFCN belonging to or transmitted further included in the IDC support information.

As another example, the IDC assistance information may include an EARFCN corresponding to a boundary value of an unusable frequency band within the total frequency band determined by the measurement setup. The boundary value may be a maximum boundary value or a minimum boundary value in a band including the corresponding EARFNC value.

As another example, the IDC support information includes an EARFCN, and the EARFCN may indicate that an operating band region in which the EARFCN exists is an unusable frequency band.

As another example, when there are a plurality of operating bands affected by the frequency band indicated by the EARFCN, the IDC assistance information may indicate that all of the plurality of operating bands are unavailable frequency bands.

As another example, only the frequency bands related to the frequency bands set by the measurement setup among the IDC ongoing frequency bands may be signaled. For example, the EARFCN value of the frequency set by the measurement setup is 1,2,3,4,5, the EARFCN value of the IDC ongoing frequency band is less than or equal to 3 (ie, the maximum threshold value is 3), and is greater than 10 If greater than or equal to (ie, minimum boundary value is 10), only the maximum boundary value 3 may be signaled by the terminal. This is because the minimum threshold value 10 is outside the current measurement set frequency band (1, 2, 3, 4, 5), and the threshold value can be determined only within the frequency set by the measurement setting.

As another example, all EARFCN values (1, 2, 3) of the frequency band set by the measurement setup among the IDC ongoing frequency bands may be signaled.

The IDC assistance information may include TDM pattern information. Values related to DRX parameters for performing a DRX operation may be recommended and transmitted through the TDM pattern information. For example, DRX cycle, DRX activity interval, DRX cycle start offset (or DRX start offset) values are transmitted. Alternatively, the DRX period, duration timer, and DRX subframe offset values may be transmitted. Here, the unit of the DRX period, the DRX subframe offset, and the DRX subframe offset may be a subframe. The duration timer may also be given in units of subframes or in units of PDCCH-subframes.

The DRX start offset value may mean a time point at which the duration timer of the DRX cycle operates. The DRX start offset value is determined based on the system frame number (SFN) 0 and the subframe number 0, and may be in a subframe (or system frame) unit.

For example, the DRX start offset value may mean a time offset between WLAN and LTE for protection of periodic beacon transmission in a wireless local area network (WLAN).

As another example of the TDM pattern, a HARQ bitmap pattern may be transmitted. The HARQ bitmap pattern refers to a bitmap pattern configured based on HARQ so that HARQ retransmission can be protected. The length of the corresponding bitmap pattern may vary according to a band configuration of an unusable frequency band. As an example of bitmap information, in the bitmap, 1 may indicate a position of a subframe, which is potentially used for LTE transmission, and 0 may mean a position of a subframe, which is potentially used for transmission of ISM.

As an example (Embodiment 1), the TDM pattern information may be information that is equally applied to all unusable frequency bands per terminal.

As another example (Embodiment 2), the TDM pattern information may be information that is equally applied to a serving frequency for which one UE receives a service.

As another example (Example 3), the TDM pattern information may include one TDM pattern information applied to the serving frequency and one TDM pattern information applied to the non-serving frequency.

However, the TDM pattern for the non-serving frequency may be selectively transmitted according to the determination of the terminal (or base station). This is because there is no problem in performing the IDC operation without the TDM pattern for the non-serving frequency, but if the UE attempts to handover to the non-serving frequency, the handover may fail due to the influence of the IDC. to be. If the terminal transmits the TDM pattern for the non-serving frequency to the base station in advance and forwards the TDM pattern from the source base station to the target base station, the terminal may perform handover considering IDC based on the TDM pattern. It works.

In other words, the terminal may transmit only the unusable frequency related information (eg, unusable frequency list) to the base station. At this time, the IDC support information does not include the TDM support information. That is, the TDM pattern for non-serving frequencies (or neighbor frequencies) may be selectively transmitted by the terminal.

In one example (Embodiment 5), to assist the base station in selecting an appropriate IDC control operation, all necessary (or possible) support information for TDM and FDM may be IDC indication (or IDC support information), Hereinafter, the IDC indication will be described as an example).

The IDC indication may include a list of IDC ongoing carriers (eg, E-UTRA carriers) and the direction of IDC interference. In addition, the IDC assistance information may include parameters for a TDM pattern for a serving carrier (or serving frequency) or DRX configuration for a TDM resolution operation.

According to the present invention, if IDC triggering is performed only for the non-serving frequency, the IDC indication may not include the TDM pattern. In this case, the IDC indication may include only FDM support information. Even when the UE is no longer in the process of IDC, the IDC support information (or IDC indication itself) included in the IDC indication may be updated. In the case of inter-eNB handover, IDC indication or IDC assistance information is transmitted from the source base station to the target base station.

As another example (Example 6), the terminal may set contents included in the IDC instruction (or IDC instruction information or IDC assistance information) as follows.

First, if there is at least one IDC affected carrier (eg, E-UTRA carrier), the IDC indication may include an IDC affected carrier list, where the IDC affected carrier list is a measurement object. object) may include an entry for each carrier to be set.

Second, if there is at least one IDC-affected carrier (eg, E-UTRA carrier), the IDC indication may include interference direction information for each carrier included in the IDC-affected carrier list.

Third, if there is at least one carrier (eg, E-UTRA carrier) affected by IDC, the IDC indication may further include TDM support information. However, if IDC triggering is performed only for the non-serving frequency, the IDC indication may not include a TDM pattern, and the IDC indication may include only FDM support information.

In this case, when the IDC indication further includes TDM support information, if the UE has DRX related support information used for IDC resolution, the IDC support information is a DRX cycle, DRX activity interval, or DRX cycle start offset value (or DRX subframe). Offset).

On the other hand, if the IDC indication further includes TDM support information, but the terminal does not have the DRX-related support information used for IDC resolution (desired HARQ-based sub associated with the support information used for IDC resolution) In case of having a HARQ based reservation pattern), the IDC indication may include an IDC subframe pattern list.

When the IDC indication is transmitted to inform the base station (or E-UTRAN, or network) that the IDC is in progress in the neighboring frequency, the terminal may include the IDC affected carrier list, the TDM support information may be excluded.

On the other hand, if the unusable frequency in the IDC support information includes the serving frequency, the base station may determine that IDC triggering is performed based on the serving frequency.

Alternatively, if the unusable frequency in the IDC support information includes both the serving frequency and the non-serving frequency, the base station may determine that IDC triggering is performed based on both the serving frequency and the non-serving frequency.

Alternatively, if the unusable frequency in the IDC assistant information includes only the non-serving frequency, the base station may determine that IDC triggering is performed based on the non-serving frequency.

When IDC triggering is performed based on the serving frequency, as in the first embodiment, one UE may receive only one TDM pattern information for all frequency bands, and as in the third embodiment, the serving frequency and the non-serving frequency, respectively You may receive TDM patterns for.

As another example (Example 4), TDM pattern information may be independently transmitted and recommended for each of the frequency bands defined in the unusable frequency band. For example, if the measured EARFCN value of the set frequency is 1,2,3,4,5 and the maximum boundary value of the EARFCN value of the frequency affected by IDC is 3, the EARFCN value of the unusable frequency band is 1,2 , 3, and DRX parameters are signaled for each unusable frequency band.

Additional signaling is also possible to represent the relationship between each unusable frequency band and the TDM pattern (or DRX parameter) for the corresponding signaling. For example, signaling indicating the number of EARFCN values of the unusable frequency band may be added, and the total number of TDM patterns may be known through the number of EARFCN values of the unusable frequency band.

In signaling indicating the number of EARFCN values of the unusable frequency band, the TDM pattern may be mapped in order of increasing EARFCN value of the unusable frequency band. For example, when 2, 3, 6, and 7 are signaled as EARFCN values of an unusable frequency band and four TDM patterns are signaled (pattern 1, pattern 2, pattern 3, and pattern 4), the TDM pattern is signaled. In order, they may be mapped to EARFCN values 2, 3, 6, and 7, respectively. That is, TDM pattern 1 is mapped to EARFCN value 2, TDM pattern 2 is mapped to EARFCN value 3, TDM pattern 3 is mapped to EARFCN value 6, and TDM pattern 4 is mapped to EARFCN value 7.

Alternatively, in signaling indicating the number of EARFCN values of the unusable frequency band, each of the EARFCN values of the unusable frequency band and the TDM pattern may be directly mapped. That is, when the TDM pattern is signaled, the EARFCN value mapped to each TDM pattern is simultaneously signaled. If an unusable frequency band is directly expressed as an EARFCN value, a TDM pattern may be paired to each EARFCN value to be simultaneously signaled. If an unusable frequency band is represented by a threshold, additional signaling for each of the EARFCN values is possible.

On the other hand, the IDC assistance information may include information about the type and type of another communication system capable of generating IDC in the terminal. The type information of the other communication system may be at least one of WLAN, BT or GNSS. The type information of another communication system may be at least one of a voice communication type, a streaming service type such as a multimedia VOD, or an offload type. The scope of the present invention is not limited thereto, and may include the type and type information of various communication systems.

Following step S1715, the base station selects (selects or determines) a TDM operation based on the most appropriate IDC solution (IDC solution or IDC coordination scheme) based on the IDC assistance information received from the terminal. (S1720). However, if the IDC triggering occurs for the serving frequency (which occurs only at the serving frequency and at both the serving frequency and the non-serving frequency), select the IDC solution. This is because, if IDC triggering occurs only for the non-serving frequency, since the current UE is not affected by IDC, the IDC resolution operation is unnecessary. In this case, further operation of the base station for the application of the TDM pattern is possible later, which will be described in detail with reference to FIG. 22.

If it is determined that the TDM solution is sufficient, the base station applies the TDM solution, and the TDM solution may be the operation according to FIGS. 9 to 15. At this time, a procedure (step S1730 to step S1740) including a measurement reset described below is unnecessary.

On the other hand, if it is determined that the TDM solution is not sufficient, since the measurement result of the terminal is required for the FDM solution, the base station resets the measurement. For example, if you want to completely eliminate the IDC problem, if you need load balancing (load balancing), or if you want to apply the FDM solution, which is a less resource-constrained solution than the TDM solution.

As an example of resetting measurements, the base station may add an unusable frequency band to the blacklist cell for complete elimination of the IDC.

As another example of a measurement reset, the measurement object associated with the dead frequency band in the measurement reset may be removed such that the measurement is not performed for the dead frequency band.

As another example of a measurement reset, the S-measurement reference value for the measurement object can be changed. The S-measurement reference value according to the invention can be changed to a smaller value than the S-measurement reference value for general mobility or handover. In general, the S-measurement reference value for mobility is a value corresponding to the case where the channel state of the target base station is 3 dB or more greater than the channel state of the source base station. As an example, the S-measurement reference value may be set smaller than a predetermined threshold (eg 1 dB).

Here, the S-measurement refers to a measurement in which the measurement is not performed in the neighboring cell when the measurement result of the main serving cell is smaller than a predetermined reference value (called an S-measurement reference value). The measured value to be compared with the S-measurement reference value is the RSRP of the main serving cell. The S-measurement reference value for general mobility (or handover) is set to a sufficiently large value. When the S-measurement reference value is sufficiently large, the measurement result is reported and the handover is performed when the channel state of the target base station is sufficiently large in comparison with the channel state of the source base station at the time of handover from the source base station to the target base station. In this case, factors affecting the channel state include path attenuation, inter-cell interference, adjacent channel interference, and thermal noise.

18 is a diagram illustrating a situation in which the S-measurement reference value is changed according to the present invention.

Referring to FIG. 18, scenario A represents a situation in which a relatively large reference value is set, such as an S-measurement reference value for mobility (or handover). Scenario B represents a situation in which a relatively small S-measurement reference value is set in accordance with the present invention.

In scenario A, since the S-measurement reference value is large, the measurement result without IDC effect may be small, and the measurement may not be performed in the neighbor cell. On the other hand, in scenario B, since the S-measurement reference value is small, even if the measurement result of removing the IDC effect is small, the measurement can be performed in the neighbor cell and the measurement result can be reported to the base station.

When IDC is in progress, even if the channel state considering the path attenuation or inter-cell interference between the source base station and the target base station does not have a large difference, the channel state at the source base station or the target base station may be degraded due to IDC.

That is, if it is determined based on the measurement result of removing the IDC effect, the difference in the channel state may not be large, but the difference in the channel state may occur in the measurement result including the IDC effect. In this case, if the S-measurement reference value is a large value, the base station may not receive the measurement result for the FDM because the S-measurement event is not triggered even though the channel condition worsens due to the influence of IDC. It can be difficult to perform. In addition, since the S-measurement is not performed, the measurement value itself used for the triggering operation of the S-measurement event does not exist, and thus the triggering operation may not occur.

According to the present invention, the base station may perform a measurement reset to change or eliminate the S-measurement reference value for the measurement object to a relatively small value through an additional RRC resetting procedure.

In step S1720, when IDC triggering occurs for the serving frequency, the base station transmits an IDC solution order (or TDM order) including a TDM solution, which is the determined IDC solution, to the terminal for IDC solution operation. It performs (S1725). In this case, an IDC resolution command (or TDM operation instruction) may be transmitted through an RRC connection reconfiguration message, and the IDC resolution command may include an operation of a blocking timer that blocks transmission of IDC assistance information for a predetermined time.

For example, as the TDM solution, a specific DRX pattern may be transmitted through an RRC connection reconfiguration message.

As another example, as the TDM solution, an indicator (hereinafter referred to as a TDM IDC indicator) indicating that the DRX pattern is caused by IDC may be transmitted together with a specific DRX pattern through an RRC connection reconfiguration message. Measurement performed by the UE according to the indication of the TDM IDC indicator may be changed differently than before.

As another example, as the TDM solution, HARQ retransmission in the LTE band may be rejected for beacon handling when transmitting a signal in the ISM band.

On the other hand, if the measurement reset is performed to apply the FDM solution in step S1720, information about the measurement reset is transmitted to the terminal through the RRC connection reset message (S1725).

In step S1725, when the base station determines that the TDM solution is not sufficient and resets the measurement, the terminal transmits the measurement result of performing the measurement with the IDC effect removed based on the measurement reset to the base station (S1730). The measurement result may be a result of measurement performed based on the S-measuring method.

In this case, the triggering of the measurement report for reporting the measurement result may be performed based on the S-measurement reference value set lower based on the measurement reset.

19 is a diagram illustrating a measurement setting applied to the present invention.

Referring to FIG. 19, a measurement object 1900 transmitted from a base station to a terminal through a measurement configuration information element in an RRC connection reconfiguration message is measured in frequency bands f1 1910, f2 1920, and f3. (1930), f4 (1940).

The list cells set in the frequency band f1 1910 are Cell3 and Cell4, and the black list cell is Cell6. The cell detected by the terminal is called Cell5.

The list cell set in the frequency band f2 1920 is Cell7, and the black list cell is Cell9. The cell detected by the terminal is called Cell9.

The list cells set in the frequency band f3 1930 are Cell 10 and Cell 11, and the black list cell is Cell 13. The cell detected by the terminal is called Cell12.

The list cell set in the frequency band f4 1940 is Cell14, and the black list cell is Cell16. The cell detected by the terminal is called Cell15.

In addition, it is assumed that the terminal receives a service through the main serving cell Cell1 and the secondary serving cell Cell2.

In this case, the measurable frequency bands are f1, f2, f3, and f4, which are all frequency bands measured.

In addition, for the measurement result, the measurable cell may be (1) as an example, and may be all cells (detected cells, list cells, and serving cells) that are not blacklist cells among the measurable frequency bands. Cell Cell3, Cell4 and detected cell Cell5, list cell Cell7 and detected cell Cell8 for f2, list cell Cell10, Cell11 and detected cell Cell12 for f3, list cell Cell14 and detected cell Cell15 for f4 Serving cells Cell1 and Cell2.

Alternatively, the measurable cell for the measurement result is (2) as another example, a best cell (here, best) for each frequency band of the sensed cell and the list cell which are not the serving cells and the black list cell among the measurable frequency bands. Cell means the largest cell in the corresponding frequency band), specifically, the serving cells Cell1 and Cell2, the best cell Cell4 for f1, the best cell Cell8 for f2, and the best cell Cell12 for f3. , best cell for f4 is Cell5. However, which cell is the best cell is an example, and the best cell may be determined as a different cell for each frequency band.

Alternatively, the measurable cell with respect to the measurement result may be (3) as another example, and may be a best cell for each of the frequency bands of the sensed cell and the wrist cell which are not the main serving cell and the black list cell among the measurable frequency bands, Specifically, the main serving cell Cell1, the best cell Cell4 for f1, the best cell Cell8 for f2, the best cell Cell12 for f3, and the best cell Cell15 for f4. However, which cell is the best cell is an example, and the best cell may be determined as a different cell for each frequency band.

In addition, the serving cell may be one or more of the cells for the measurable frequency band.

Meanwhile, the measurement value included in the measurement result may be a measurement value used to select an FDM-based IDC solution.

In addition, the measurement value included in the measurement result may be a measurement value from which IDC affection has been removed.

20 is a view for explaining an example of a method of obtaining a measured value with the IDC influence removed according to the present invention.

Referring to FIG. 20, IDC is generated due to ISM transmission for LTE DL reception of a terminal. The IDC generation interval 2000 is measurement samples that are removed in a filtering process in which the UE derives a measurement result from all measurement samples. The UE calculates a measurement value based on the remaining measurement samples except for the IDC generation interval 2000.

The measured value can be calculated using Equation 1 below.

Referring to Equation 1, M _n is the most recent measurement sample, F _n is the measurement to be reported by the measurement report, F _{n -1} is the measurement reported by the previous measurement report, and a is 1 / 2 (k / 4), where k is the filter coefficient used for filtering.

The measurement sample is a measurement value in units of subframes, and is a variable required to derive the measurement result to be reported by the measurement report.

Or, the measurement sample means a measurement value for the subframe selected by the rule defined in the wireless system among the measurement values for all the subframes received by the terminal.

The measurement sample may be obtained at the physical layer of the terminal, and filtering may be performed at an upper layer of the terminal, for example, a radio resource control (RRC) layer.

The measurement sample may be acquired continuously every subframe, but may be obtained discontinuously as long as the capacity of the terminal or a condition defined by the system is satisfied. That is, another measurement sample may be obtained after a predetermined interval of time after one measurement sample is obtained. In this case, measurement samples are not obtained for some subframes. The spacing section may be periodic or aperiodic.

For example, in order to obtain a measurement sample having no IDC influence on the IDC generation interval 2000, an autonomously denial may be performed for a communication system that generates IDC interference in the terminal. For example, for measurement of the LTE band, the measurement sample is arbitrarily rejected for ISM transmission.

Similar to an arbitrary rejection scheme, it is also possible to reduce the ISM transmit power. By significantly reducing the transmit power, the impact of IDC can be reduced.

As another example, in order to obtain a measurement sample having no IDC influence on the IDC generation section 2000, there is a method of measuring the IDC interference strength in the terminal for the measurement samples having the IDC influence and calculating the same. That is, only IDC interference magnitudes are removed from IDC-affected measurement samples.

First, a measurement sample having an influence of IDC in a serving cell or a neighboring cell obtained based on RSRQ is conceptually represented by Equation 2 below.

Where S is the strength of the received signal through the serving cell, I is the strength of the interference signal (e.g., inter-cell interference) acting on the system, N is the strength of the noise (e.g., thermal noise), I 'is the strength of IDC. The measurement sample refers to a relative ratio of IDC and inter-cell interference of the received signal.

According to the present invention, a method of eliminating IDC interference in a measurement sample is as follows.

In this case, the I 'value can be obtained by different methods according to the implementation in the terminal, and by removing the I' value, a measurement sample without the influence of I 'can be obtained.

As another example, in order to obtain a measurement sample having no IDC influence on the IDC generation interval 2000, when average number of IDC influenced samples is less than a predetermined reference value, the influence of the IDC influenced measurement samples may be determined by average filtering alone. Can be removed In this case, a measurement sample having no IDC influence may be obtained according to Equation 2 above.

21 is a diagram illustrating another example of a method for obtaining a measured value with the IDC influence removed according to the present invention.

Referring to FIG. 21, in a section in which IDC occurs in a serving cell or neighbor cell in which IDC occurs (first section), the terminal obtains a measurement sample affected by IDC, and a section in which IDC does not occur. In the second section, measurement samples without the influence of IDC are obtained. In addition, the terminal obtains a measurement sample in the entire period (third section) irrespective of the IDC in the serving cell or the neighbor cell in which IDC does not occur. In this case, the UE may obtain a measurement sample in every subframe, a predetermined subframe, or any subframe in each interval.

For example, the measurement sample affected by IDC in the first interval may include an IDC, inter-cell interference (for example, interference between serving and non-serving cells in the same channel, adjacent channel interference, etc.), and thermal noise. The measurement sample considers all the effects, and the measurement sample without the influence of IDC in the second interval is the measurement sample having only the influence of intercell interference or thermal noise.

In another embodiment, in order to remove the influence of interference caused by IDC from the measurement sample in the serving cell or the neighboring cell in which the IDC occurs, the transmission of the ISM may be prevented for the measurement sample. . Preventing the transmission of ISM may be a way to reduce the transmission power of the ISM to a fairly small level. The considerably small level is an example where the IDC interference strength of the ISM is as small as -20 dB compared to the LTE received signal at the LTE receiver. As another example of preventing the transmission of the ISM, the ISM transmission may be suspended or not transmitted for the sample. That is, although the transmission of the ISM is planned, the transmission may be suspended in time or the transmission may be rejected by the terminal. According to this method, a measurement sample can be obtained in which the influence of in-device coexistence interference is removed in all sections. Of course, a measurement sample without the influence of IDC means a measurement sample with only the influence of intercell interference or thermal noise.

In another embodiment, two measurement samples may be obtained for a first section in a serving cell or a neighbor cell in which IDC occurs. The two measurement samples mean a measurement sample including the influence of IDC interference and a measurement sample without the influence of IDC interference. The measurement sample from which the influence of IDC interference is removed means a measurement sample having a measurement value having no influence of interference by applying an interference cancellation technique to the sample. An embodiment of the interference cancellation scheme may be a method of compensating the strength of the ISM transmit power at the ISM transmitter by the SINR value of the sample.

Here, the first network system refers to a network system that provides the effect of interference when IDC occurs. The network system attacked by the interference may be referred to as a second network system. For example, when the ISM receiver is interfered with by LTE uplink, the ISM is the second network system. On the contrary, when the ISM transmitter receives interference from the LTE downlink receiver, the LTE system is the second network system.

The measurement sample without the influence of IDC in the serving cell or neighbor cell obtained based on the RSRQ is conceptually expressed by Equation 4 below.

Where S is the strength of the received signal through the neighbor cell in the second network system, I is the strength of the interference signal (e.g., inter-cell interference) acting on the second network system, and N is noise (e.g., , Thermal noise). In other words, the measurement sample refers to a relative ratio of interference and noise of the received signal.

The measurement sample without the influence of IDC in the serving cell or neighbor cell obtained based on RSRP is conceptually expressed as the following equation.

Here, S denotes the strength of the received signal through the neighbor cell in the second network system. That is, the measurement sample refers to the strength of the received signal in the corresponding neighbor cell in the second network system.

Measurement samples having an influence of IDC in a serving cell or a neighbor cell obtained based on RSRQ are conceptually as described in Equation 2 above.

The measurement sample with the influence of IDC in the serving cell or neighbor cell obtained based on RSRP is conceptually expressed as the following equation.

Here, I 'is the strength of the IDC, and the measurement sample means the strength of the IDC signal in the serving cell. S is the strength of the received signal in the second network system. If we only wanted to measure the impact of IDC, it would be I '. If the mixed IDC is measured, S + I 'will be the result. If the value without IDC is measured, S will be the result.

Meanwhile, the entity performing the measurement (eg, the terminal) may be one entity, and the entity performing the measurement may be plural. For example, an entity performing a measurement considering IDC and an entity performing a measurement not considering IDC may exist independently.

The measurement results can be used to determine which IDC solution is more appropriate. For example, if the channel quality of the target cell for the FDM operation is poor, the base station may select a TDM solution to solve the IDC problem of the serving cell.

After step S1730, the base station selects (or determines) the FDM operation based on the measurement result based on the IDC solution (S1735), and the base station includes the FDM operation indication (FDM order) in the RRC connection reconfiguration message and transmits it to the terminal. (S1740). The FDM operation may be an operation according to FIGS. 5 to 6.

For example, when the IDC solution is an FDM operation, the secondary serving cell is changed through a serving cell management operation (for example, deletion of the secondary serving cell in question). A handover procedure for changing the primary serving cell may be initiated.

On the other hand, if the IDC solution determined in step S1720 or step S1735 based on the IDC support information is the same as the existing IDC solution, the IDC solution command process (or IDC solution operation process) in step S1725 or S1740. This can be omitted.

22 is a flowchart illustrating another example of in-device coexistence interference control performed between a base station and a terminal according to the present invention.

Referring to FIG. 22, steps S2200 to S2210 are the same as steps S1700 to S1710 of FIG. 17.

That is, the terminal transmits the performance information of the terminal to the base station (S2200). In this case, the performance information of the terminal may be transmitted through an RRC message. The capability information of the terminal includes information on the capability of configuring IDC assistant information or a frequency band in which IDC may exist. The IDC viable frequency band may be indicated (or expressed) using EARFCN.

Following step S2200, the base station transmits an RRC connection reconfiguration message to the terminal to perform RRC connection reconfiguration (S2205). The base station may allow transmission of IDC assistance information of the terminal to the enabled state through the RRC connection reconfiguration. That is, IDC assistance information enable information (or IDC assistance information enable indicator) may be signaled through the RRC connection reconfiguration message. In addition, the RRC connection reconfiguration message may include the blocking timer related information that is set in the terminal to prevent the frequent triggering by the IDC that changes from time to time.

Subsequently to step S2205, the terminal performs IDC assistance information triggering (hereinafter referred to as IDC triggering) based on the IDC triggering condition (S2210).

For example, a frequency band in which IDC triggering occurs may be a frequency band associated with a serving cell (main serving cell or secondary serving cell) among frequency bands measured and measured by the RRC connection resetting. That is, IDC triggering may occur at the serving frequency.

As another example, the frequency band in which IDC triggering occurs may include not only a frequency band associated with the serving cell but also a frequency band measured by the terminal but not receiving a service. That is, IDC triggering may occur at the serving frequency and the non-serving frequency.

As another example, the frequency band in which IDC triggering occurs may include only a frequency band that is measured by the terminal but is not receiving a service. That is, IDC triggering may occur only at non-serving frequencies.

After step S2210, the terminal transmits IDC assistance information to the base station (S2215).

If IDC triggering occurs for a non-serving frequency, the base station does not perform an operation of selecting (or determining) and applying an IDC solution for IDC control (or avoidance).

For example, if the measured EARFCN value of the set frequency is 1,2,3,4,5, the EARFCN value of the frequency associated with the main serving cell is 3 and the EARFCN value of the frequency associated with the secondary serving cell is 4,5, that is, , Assume that the EARFCN value of the serving frequency is 3,4,5 and the EARFCN value of the non-serving frequency is 1,2. If the EARFCN value of the unusable frequency band is 4,5, IDC triggering is generated at the non-serving frequency, and the base station does not perform an operation for determining an IDC solution.

As such, the base station may determine the IDC triggered frequency band based on the IDC assistance information. If at least one serving frequency is included in the unusable frequency band in the IDC support information, the base station determines that IDC triggering has occurred in the serving frequency band, and performs an operation of determining and applying an IDC solution. However, if no serving frequency is included in the unusable frequency band, the base station determines that the IDC triggering occurs in the non-serving frequency band (the IDC triggering does not occur in the serving frequency band), and the IDC solution Do not perform actions to determine and apply.

Subsequently to step S2215, even if the base station does not perform the IDC operation, the base station may perform an operation of preventing a problem of communication service that may occur with respect to the non-serving frequency in advance (S2220). That is, even if the current terminal does not cause an IDC problem on the communication service, the IDC support information may be usefully used in order to prevent a problem of the communication service due to a handover or a change in the IDC situation at the base station. have. Step S2220 is not an essential configuration in the present invention. When IDC triggering is performed on a non-serving frequency, the step S2220 is an additional configuration that may utilize IDC assistance information when the base station does not perform the IDC operation.

For example, the base station may update the blacklist (or blacklist cell) to include an unusable frequency band that is a non-serving frequency, and then update the updated blacklist (or blacklist cell) in a measurement setting transmitted to the terminal. Includes.

As another example, when performing a handover on an unusable frequency band that is a non-serving frequency, the base station may perform an operation of applying a TDM pattern for the non-serving frequency received from the terminal.

23 is a flowchart illustrating another example of in-device coexistence interference control performed between a base station and a terminal according to the present invention. A method of constructing and signaling a message to reduce the size of IDC support information and to differentially deliver the information. The size of the IDC assistance information is prevented from becoming too large, thereby improving the reliability and speed of delivery of the IDC assistance information. If the size of the message including the IDC support information is too large, if there is insufficient radio resources between the terminal and the base station, it must be divided and transmitted several times, and the base station collects information until all pieces of the message are transmitted. This may be because there is a delay in information transmission due to the inability to interpret or interpret it.

Referring to FIG. 23, steps S2300 to S2310 are the same as steps S1700 to S1710 of FIG. 17.

That is, the terminal transmits the performance information of the terminal to the base station (S2300). In this case, the performance information of the terminal may be transmitted through an RRC message. The capability information of the terminal includes information on the capability of configuring IDC assistant information or a frequency band in which IDC may exist. The IDC viable frequency band may be indicated (or expressed) using EARFCN.

Following step S2300, the base station transmits an RRC connection reset message to the terminal to perform RRC connection reset (S2305). The base station may allow transmission of IDC assistance information of the terminal to the enabled state through the RRC connection reconfiguration. That is, IDC assistance information enable information (or IDC assistance information enable indicator) may be signaled through the RRC connection reconfiguration message. In addition, the RRC connection reconfiguration message may include blocking timer related information set in the terminal in order to prevent frequent triggering by the IDC that changes from time to time.

Subsequently to step S2305, the terminal performs IDC assistance information triggering (hereinafter referred to as IDC triggering) based on the IDC triggering condition (S2310).

For example, a frequency band in which IDC triggering occurs may be a frequency band associated with a serving cell (main serving cell or secondary serving cell) among frequency bands measured and measured by the RRC connection resetting. That is, IDC triggering may occur at the serving frequency.

As another example, the frequency band in which IDC triggering occurs may include not only a frequency band associated with the serving cell, but also a frequency band measured by the terminal but not receiving a service. That is, IDC triggering may occur at the serving frequency and the non-serving frequency.

As another example, the frequency band in which IDC triggering occurs may include only a frequency band that is measured by the terminal but is not receiving a service. That is, IDC triggering may occur only at non-serving frequencies.

In step S2310, IDC triggering may occur for the serving frequency or may occur for the non-serving frequency.

In step S2310, the IDC assistance information is configured to include the TDM pattern in the unusable frequency band and serving frequency. On the other hand, the IDC assistance information may or may not include a TDM pattern for the non-serving frequency.

If the unusable frequency in the IDC assistant information includes the serving frequency, the base station may determine that IDC triggering is performed based on the serving frequency. Alternatively, if the unusable frequency in the IDC support information includes both the serving frequency and the non-serving frequency, the base station may determine that IDC triggering is performed based on both the serving frequency and the non-serving frequency. Alternatively, if the unusable frequency in the IDC assistant information includes only the non-serving frequency, the base station may determine that IDC triggering is performed based on the non-serving frequency.

The terminal transmits IDC support information to the base station (S2315). If the IDC support information does not include the TDM pattern for the non-serving frequency, the terminal adds additional IDC support information (additional IDC) including TDM pattern information for the non-serving frequency. assistant information) may be transmitted (S2320). The additional ICD assistance information is additionally transmitted only if the IDC assistance information transmitted in step S2315 does not include a TDM pattern for the non-serving frequency.

The TDM pattern information on the non-serving frequency does not refer to an IDC in progress state affecting the communication state currently being served by the serving cell, but when the UE intends to perform handover at the corresponding frequency or carrier aggregation : When setting communication at the corresponding frequency by CA), the base station knows the TDM pattern in advance so as not to reduce communication quality at the corresponding frequency.

In addition, by including the TDM pattern information for the non-serving frequency in the additional IDC support information instead of the IDC support information, it is possible to prevent the IDC support information from becoming too large.

24 is an example of a flowchart illustrating an operation of a terminal performing IDC control according to the present invention.

Referring to Figure 24, the terminal transmits the performance information of the terminal to the base station (S2400). In this case, the performance information of the terminal may be transmitted through an RRC message. The capability information of the terminal includes information on the capability of configuring IDC assistant information or a frequency band in which IDC may exist. The IDC viable frequency band may be indicated (or expressed) using EARFCN.

Subsequently to step S2400, the terminal receives the IDC assistant information enable through the RRC connection reconfiguration message (S2405). The IDC assistant information enable indicator may be bitmap information consisting of 1 bit. In addition, the RRC connection reconfiguration message may include blocking timer related information set in the terminal in order to prevent frequent triggering by the IDC that changes from time to time.

Subsequently, in step S2405, the terminal performs IDC assistance information triggering on the basis of the IDC triggering condition (S2410).

For example, a frequency band in which IDC triggering occurs may be a frequency band associated with a serving cell (main serving cell or secondary serving cell) among frequency bands measured and measured by the RRC connection resetting. That is, IDC triggering may occur at the serving frequency.

As another example, the frequency band in which IDC triggering occurs may be not only a frequency band associated with the serving cell, but also a frequency band that has been measured by the terminal but is not receiving a service. That is, IDC triggering may occur at the serving frequency and the non-serving frequency.

As another example, the frequency band in which IDC triggering occurs may include only a frequency band that is measured by the terminal but is not receiving a service. That is, IDC triggering may occur only at non-serving frequencies.

After step S2410, the terminal transmits IDC assistance information to the base station (S2415). The IDC assistance information may include unusable frequency band information or may include TDM pattern information. For example, the IDC assistance information may include all EARFCN values of the unusable frequency band or EARFCN corresponding to the boundary values of the unusable frequency band. The IDC assistance information may include TDM pattern information. The TDM pattern may be a DRX period, a DRX activity interval, or a DRX subframe offset value. Alternatively, the TDM pattern may be DRX period, duration timer, and DRX subframe offset values. Here, the unit of the DRX period and the DRX subframe offset is a subframe. The duration timer may also be given in subframe units. However, the duration timer may be in the unit of PDCCH-subframe.

As an example (Embodiment 1), the TDM pattern information may be information that is equally applied to all unusable frequency bands per terminal.

As another example (Embodiment 2), the TDM pattern information may be information that is equally applied to a serving frequency for which one UE receives a service.

As another example (Example 3), the TDM pattern information may include one TDM pattern information applied to the serving frequency and one TDM pattern information applied to the non-serving frequency. However, the TDM pattern for the non-serving frequency may be selectively transmitted according to the determination of the terminal (or base station).

As another example (Example 4), TDM pattern information may be independently transmitted and recommended for each of the frequency bands defined in the unusable frequency band.

If the unusable frequency includes only the non-serving frequency (that is, when IDC triggering occurs only for the non-serving frequency, S2420), the IDC resolution operation is unnecessary because the current UE is not affected by IDC. If the IDC triggering occurs for the non-serving frequency, the base station does not perform the operation of selecting (or determining) and applying the IDC solution for IDC control (or avoidance), and communication that may occur for the non-serving frequency. An operation of preventing a problem of a service in advance may be selectively performed according to the determination of the base station (or terminal) (S2460). That is, even if the current terminal does not cause a problem due to IDC on the communication service, the IDC support information is useful as information for preventing a problem of the communication service due to a handover or a change in the IDC situation at the base station. Can be used. Step S2460 is not an essential configuration in the present invention. When IDC triggering is performed on a non-serving frequency, step S2460 is an additional configuration that may utilize IDC assistance information when the base station does not perform IDC operation.

When the unusable frequency includes a serving frequency (when it occurs only at the serving frequency, and occurs at both the serving frequency and the non-serving frequency, S2420), the terminal performs a TDM operation selected by the base station (S2435).

However, if the TDM pattern for the non-serving frequency is not transmitted (S2425), before the TDM operation, the TDM pattern information for the non-serving frequency may be additionally transmitted through the additional IDC support information (S2430). Step S2430 is not an essential configuration in the present invention, when the base station needs a TDM pattern for the non-serving frequency, additional IDC assistant information transmission is transmitted. That is, the TDM pattern may not be transmitted.

If it is determined that the TDM solution is sufficient and FDM operation is unnecessary (S2440). The terminal terminates the procedure without performing the FDM operation procedure including the measurement reset.

If it is determined that the TDM solution is not sufficient and the FDM operation is necessary (S2440), since the measurement result of the UE is required for the FDM solution, the UE receives a reset of the measurement from the base station (S2445). For example, if you want to completely eliminate the IDC problem, if you need to balance the load, or if you want to apply the FDM solution, a solution that is less resource constraint than the TDM solution.

As an example of resetting measurements, the base station may add an unusable frequency band to the blacklist cell for complete elimination of the IDC.

As another example of a measurement reset, the measurement object associated with the dead frequency band in the measurement reset may be removed such that the measurement is not performed for the dead frequency band.

As another example of a measurement reset, the S-measurement reference value for the measurement object can be changed. The S-measurement reference value according to the invention can be changed to a smaller value than the S-measurement reference value for general mobility (or handover).

Subsequent to step S2445, when the base station resets the measurement, the terminal transmits the measurement result of performing the measurement with the IDC effect removed based on the measurement reset to the base station (S2450). The measurement result may be a result of measurement performed based on the S-measuring method. In this case, the triggering of the measurement report for reporting the measurement result may be performed based on the S-measurement reference value set lower based on the measurement reset.

Following step S2450, the terminal performs an FDM operation selected by the base station (S2455). The FDM operation may be an operation according to FIGS. 5 to 6.

For example, when the IDC solution is an FDM operation, a secondary serving cell is changed through a serving cell management operation (for example, deletion of a secondary serving cell in question), or a handover procedure for changing a primary serving cell is performed. May be initiated.

As another example of IDC assistant information transmission, if the TDM pattern is not transmitted for the non-serving frequency, the procedure of determining the S2425 and the additional transmission of the S2430 may not be necessary.

25 is an example of a flowchart illustrating an operation of a base station for performing IDC control according to the present invention.

Referring to Figure 25, the base station receives the performance information of the terminal (S2500). In this case, the performance information of the terminal may be transmitted through an RRC message. The capability information of the terminal includes information on the capability of configuring IDC assistant information or a frequency band in which IDC may exist. The IDC viable frequency band may be indicated (or expressed) using EARFCN.

Subsequent to step S2500, the base station transmits IDC assistance information enable through an RRC connection reconfiguration message (S2505). The IDC assistant information enable may be bitmap information consisting of 1 bit.

Subsequently to step S2505, IDC assistant information is received from the terminal (S2510). The IDC assistance information may include unusable frequency band information or may include TDM pattern information. For example, the IDC assistance information may include all EARFCN values of the unusable frequency band or EARFCN corresponding to the boundary values of the unusable frequency band. The IDC assistance information may include TDM pattern information. The TDM pattern may be a DRX period, a DRX activity interval, or a DRX subframe offset value.

As an example (Embodiment 1), the TDM pattern information may be information that is equally applied to all unusable frequency bands per terminal.

As another example (Embodiment 2), the TDM pattern information may be information that is equally applied to a serving frequency for which one UE receives a service.

As another example (Example 3), the TDM pattern information may include one TDM pattern information applied to the serving frequency and one TDM pattern information applied to the non-serving frequency. However, the TDM pattern for the non-serving frequency may be selectively transmitted as needed.

As another example (Example 4), TDM pattern information may be independently transmitted and recommended for each of the frequency bands defined in the unusable frequency band.

If the unusable frequency includes only the non-serving frequency (that is, when IDC triggering occurs only for the non-serving frequency, S2515), since the current UE is not affected by IDC, the IDC resolution operation is unnecessary and the base station controls IDC. Instead of selecting (or determining) and applying an IDC solution for (or avoiding), an operation of preventing a communication service problem that may occur for a non-serving frequency may be performed in advance (S2555). ). That is, even if the current terminal does not cause a problem due to IDC on the communication service, the IDC support information is useful as information for preventing a problem of the communication service due to a handover or a change in the IDC situation at the base station. Can be used. For example, in order to prevent handover to the frequency, the measurement setting for the frequency may not be performed. In another embodiment, when a handover to a corresponding frequency is transmitted, a TDM pattern may be transmitted to a target base station so that the corresponding base station may perform a suitable DRX operation to eliminate in-device coexistence interference. Step S2555 is not an essential configuration in the present invention, and when the base station does not perform the IDC operation when IDC triggering is performed on the non-serving frequency, it is an additional configuration that can utilize the IDC support information.

If the unusable frequency includes the serving frequency (if generated only at the serving frequency, and occurs at both the serving frequency and the non-serving frequency, S2515), the base station selects (or determines) the IDC solution (S2520). At this time, the base station that has not received the measurement result selects the TDM operation.

The base station instructs the terminal to perform a TDM operation (S2525). However, the base station may additionally receive TDM pattern information for the non-serving frequency from the terminal through additional IDC support information before the TDM operation.

If it is determined that the TDM solution is sufficient and the FDM operation is unnecessary (S2530). The terminal terminates without performing an FDM operation procedure including a reset measurement.

If it is determined that the TDM solution is not enough and the FDM operation is necessary (S2530), since the measurement result of the terminal is required for the FDM solution, the base station resets the measurement of the terminal (S2535). For example, if you want to completely eliminate the IDC problem, if you need to balance the load, or if you want to apply the FDM solution, a solution that is less resource constraint than the TDM solution.

As an example of resetting measurements, the base station may add an unusable frequency band to the blacklist cell for complete elimination of the IDC.

As another example of a measurement reset, the measurement object associated with the dead frequency band in the measurement reset may be removed such that the measurement is not performed for the dead frequency band.

As another example of a measurement reset, the S-measurement reference value for the measurement object can be changed. The S-measurement reference value according to the invention can be changed to a smaller value than the S-measurement reference value for general mobility (or handover).

Subsequent to step S2535, when the base station resets the measurement, the base station receives a measurement result from the terminal in which the terminal performs the measurement with the IDC effect removed based on the measurement reset (S2540). The measurement result may be a result of measurement performed based on the S-measuring method. In this case, the triggering of the measurement report for reporting the measurement result may be performed based on the S-measurement reference value set lower based on the measurement reset.

Subsequently to step S2540, the base station selects an IDC solution based on the measurement result and determines an FDM operation (S2545). The base station instructs the terminal to the selected FDM operation (S2550). The FDM operation may be an operation according to FIGS. 5 to 6. For example, when the IDC solution is an FDM operation, the secondary serving cell is changed through a serving cell management operation (for example, deletion of the secondary serving cell in question). A handover procedure for changing the primary serving cell may be initiated.

26 is a block diagram illustrating a terminal and a base station for performing IDC control according to the present invention.

Referring to FIG. 26, the terminal includes a receiver 2605, a triggering unit 2610, a controller 2615, a measurement unit 2620, and a transmitter 2625.

The transmitter 2625 transmits performance information of the terminal 2600 to the base station 2650. In this case, the performance information may be transmitted through an RRC message. The performance information includes information on the capability of constructing IDC assistance information or a frequency band in which IDC may exist. The IDC viable frequency band may be indicated (or expressed) using EARFCN.

The receiver 2605 receives IDC support information enable through an RRC connection reconfiguration message. The IDC assistant information enable indicator may be bitmap information consisting of 1 bit. In addition, the RRC connection reconfiguration message may include blocking timer related information that is set in the terminal 2600 in order to prevent frequent triggering by the IDC that changes from time to time.

The triggering unit 2610 performs triggering of IDC assistant information based on the IDC triggering condition.

For example, a frequency band in which IDC triggering occurs may be a frequency band associated with a serving cell (main serving cell or secondary serving cell) among frequency bands measured and measured by the RRC connection resetting.

As another example, the frequency band in which IDC triggering occurs may be not only a frequency band associated with the serving cell but also a frequency band set by the terminal 2600 but not under service.

As another example, the frequency band in which IDC triggering occurs may include only a frequency band set by the terminal 2600 but not in service.

The transmitter 2625 transmits IDC assistant information to the base station 2650. The IDC assistance information may include unusable frequency band information or may include TDM pattern information. For example, the IDC assistance information may include all EARFCN values of the unusable frequency band or EARFCN corresponding to the boundary values of the unusable frequency band. The IDC assistance information may include TDM pattern information. The TDM pattern may be a DRX period, a DRX activity interval, or a DRX subframe offset value. Alternatively, the TDM pattern may be DRX period, duration timer, and DRX subframe offset values.

As an example (Embodiment 1), the TDM pattern information may be information that is equally applied to all unusable frequency bands per one terminal 2600.

As another example (Embodiment 2), the TDM pattern information may be information that is equally applied to a serving frequency for which one UE receives a service.

As another example (Example 3), the TDM pattern information may include one TDM pattern information applied to the serving frequency and one TDM pattern information applied to the non-serving frequency. However, the TDM pattern for the non-serving frequency may be selectively transmitted according to the determination of the terminal 2600 (or the base station 2650).

As another example (Example 4), TDM pattern information may be independently transmitted and recommended for each of the frequency bands defined in the unusable frequency band.

When IDC triggering occurs for the non-serving frequency, the controller 2615 may selectively perform an operation of preventing a problem of a communication service that may occur for the non-serving frequency in advance. That is, even if the current terminal 2600 does not cause a problem due to IDC on the communication service, the base station 2650 is used as information for preventing a problem of a communication service caused by a handover or a change in the IDC situation in advance. IDC support information can be useful.

The transmitter 2625 may transmit only the unusable frequency related information (eg, unusable frequency list) to the base station 2650 in the IDC assistant information. At this time, the IDC support information does not include the TDM support information. That is, the TDM pattern for non-serving frequencies (or neighbor frequencies) may be selectively transmitted by the terminal.

In one example (Embodiment 5), to assist the base station 2650 in selecting an appropriate IDC control operation, all necessary (or possible) support information for TDM and FDM may be IDC indication (or IDC support information). It may be transmitted to the base station 2650 through the IDC indication described below as an example).

The IDC indication may include a list of IDC ongoing carriers (eg, E-UTRA carriers) and the direction of IDC interference. In addition, the IDC assistance information may include parameters for a TDM pattern for a serving carrier (or serving frequency) or DRX configuration for a TDM resolution operation.

According to the present invention, if IDC triggering is performed only for the non-serving frequency, the IDC indication may not include the TDM pattern. In this case, the IDC indication may include only FDM support information. Even when the UE is no longer in the process of IDC, the IDC support information (or IDC indication itself) included in the IDC indication may be updated. In the case of inter-eNB handover, IDC indication or IDC assistance information is transmitted from the source base station to the target base station.

As another example (Example 2), the controller 2615 may set contents included in an IDC instruction (or IDC instruction information or IDC assistance information) as follows.

First, if there is at least one IDC affected carrier (eg, E-UTRA carrier), the IDC indication may include an IDC affected carrier list, where the IDC affected carrier list is a measurement object. object) may include an entry for each carrier to be set.

Second, if there is at least one IDC-affected carrier (eg, E-UTRA carrier), the IDC indication may include interference direction information for each carrier included in the IDC-affected carrier list.

Third, if there is at least one carrier (eg, E-UTRA carrier) affected by IDC, the IDC indication may further include TDM support information. However, if IDC triggering is performed only for the non-serving frequency, the IDC indication may not include a TDM pattern, and the IDC indication may include only FDM support information.

In this case, when the IDC indication further includes TDM support information, if the UE has DRX related support information used for IDC resolution, the IDC support information is a DRX cycle, DRX activity interval, or DRX cycle start offset value (or DRX subframe). Offset).

On the other hand, if the IDC indication further includes TDM support information, but the terminal does not have DRX related support information used for IDC resolution (desired subframe reservation related to support information used for IDC resolution) IDC indication may include an IDC subframe pattern list.

When the IDC indication is transmitted to inform the base station 2650, or E-UTRAN, or the network that the IDC is in progress on the neighboring frequency, the terminal 2600 may include an IDC affected carrier list, and the TDM support information may be May be excluded.

If the unusable frequency includes a serving frequency, the controller 2615 performs a TDM operation selected by the base station 2650.

If the TDM pattern for the non-serving frequency is not transmitted, the transmitter 2625 may additionally transmit TDM pattern information for the non-serving frequency through additional IDC support information before the TDM operation.

If it is determined that the TDM solution is sufficient and the FDM operation is not necessary, the controller 2615 terminates the procedure without performing the FDM operation procedure including the measurement reset.

If the control unit 2615 determines that the TDM solution is not sufficient and the FDM operation is necessary, the receiver 2605 needs the measurement result of the terminal 2600 for the FDM solution. Receive a reset. For example, if you want to completely eliminate the IDC problem, if you need to balance the load, or if you want to apply the FDM solution, a solution that is less resource constraint than the TDM solution.

As an example of resetting measurements, the base station 2650 may add an unusable frequency band to the blacklist cell for complete removal of the IDC.

As another example of a measurement reset, the measurement object associated with the dead frequency band in the measurement reset may be removed such that the measurement is not performed for the dead frequency band.

As another example of a measurement reset, the S-measurement reference value for the measurement object can be changed. The S-measurement reference value according to the invention can be changed to a smaller value than the S-measurement reference value for general mobility (or handover).

When the base station 2650 resets the measurement, the transmitter 2625 transmits the measurement result of performing the measurement to remove the IDC influence based on the measurement reset to the base station 2650.

The measuring unit 2620 performs the measurement based on the S-measuring method. Triggering of the measurement report to report the measurement result may be performed based on the S-measurement reference value set lower based on the measurement reset.

The controller 2615 performs the FDM operation selected by the base station 2650. The FDM operation may be an operation according to FIGS. 5 to 6. For example, when the IDC solution is an FDM operation, the secondary serving cell is changed through a serving cell management operation (for example, deletion of the secondary serving cell in question). A handover procedure for changing the primary serving cell may be initiated.

The base station 2650 according to the present invention includes a receiver 2655, a controller 2660, an IDC determiner 2665, and a transmitter 2670.

The receiver 2655 receives performance information of the terminal 2600. In this case, the performance information of the terminal 2600 may be transmitted through an RRC message. The performance information of the terminal 2600 includes information on the capability of configuring IDC assistant information or a frequency band in which IDC may exist. The IDC viable frequency band may be indicated (or expressed) using EARFCN.

The transmitter 2670 transmits IDC assistant information enable through an RRC connection reconfiguration message. The IDC assistant information enable may be bitmap information consisting of 1 bit.

The receiver 2655 receives IDC support information from the terminal 2600. The IDC assistance information may include unusable frequency band information or may include TDM pattern information. For example, the IDC assistance information may include all EARFCN values of the unusable frequency band or EARFCN corresponding to the boundary values of the unusable frequency band. The IDC assistance information may include TDM pattern information. The TDM pattern may be a DRX period, a DRX activity interval, or a DRX subframe offset value.

As an example (Embodiment 1), the TDM pattern information may be information that is equally applied to all unusable frequency bands per one terminal 2600.

As another example (Embodiment 2), the TDM pattern information may be information that is equally applied to a serving frequency for which one UE receives a service.

As another example (Example 3), the TDM pattern information may include one TDM pattern information applied to the serving frequency and one TDM pattern information applied to the non-serving frequency. However, the TDM pattern for the non-serving frequency may be selectively transmitted as needed.

As another example (Example 4), TDM pattern information may be independently transmitted and recommended for each of the frequency bands defined in the unusable frequency band.

If the unusable frequency includes only the non-serving frequency (that is, IDC triggering occurs only for the non-serving frequency), the controller 2660 prevents a problem of a communication service that may occur for the non-serving frequency in advance. You can perform the operation. That is, even if the current terminal 2600 does not cause a problem due to IDC on the communication service, the base station 2650 is used as information for preventing a problem of a communication service caused by a handover or a change in the IDC situation in advance. IDC support information can be useful.

The IDC determiner 2665 selects (or determines) an IDC solution when the unusable frequency includes a serving frequency. At this time, if the measurement result is not received, select the TDM operation.

The transmitter 2670 instructs the terminal 2600 to perform a TDM operation.

The receiver 2655 may additionally receive TDM pattern information for the non-serving frequency from the terminal 2600 through additional IDC support information.

When the base station 2650 determines that the TDM solution is sufficient and determines that the FDM operation is unnecessary, the terminal 2600 ends without performing the FDM operation procedure including the measurement reset.

If it is determined that the TDM solution is not sufficient and the FDM operation is necessary, the controller 2660 resets the measurement of the terminal 2600 since the measurement result of the terminal 2600 is required for the FDM solution. For example, if you want to completely eliminate the IDC problem, if you need to balance the load, or if you want to apply the FDM solution, a solution that is less resource constraint than the TDM solution.

As an example of resetting a measurement, the controller 2660 may add an unusable frequency band to the blacklist cell to completely remove the IDC.

As another example of a measurement reset, the measurement object associated with the dead frequency band in the measurement reset may be removed such that the measurement is not performed for the dead frequency band.

As another example of a measurement reset, the S-measurement reference value for the measurement object can be changed. The S-measurement reference value according to the invention can be changed to a smaller value than the S-measurement reference value for general mobility (or handover).

When the control unit 2660 resets the measurement, the reception unit 2655 receives a measurement result from the terminal 2600 in which the terminal 2600 performs the measurement in which the IDC effect is removed based on the measurement reset. The measurement result may be a result of measurement performed based on the S-measuring method. In this case, the triggering of the measurement report for reporting the measurement result may be performed based on the S-measurement reference value set lower based on the measurement reset.

The IDC decision unit 2665 selects an IDC solution based on the measurement result and determines the FDM operation.

The transmitter 2670 instructs the terminal 2600 of the selected FDM operation. The FDM operation may be an operation according to FIGS. 5 to 6. For example, when the IDC solution is an FDM operation, the secondary serving cell is changed through a serving cell management operation (for example, deletion of the secondary serving cell in question). A handover procedure for changing the primary serving cell may be initiated.

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 intended to illustrate rather than limit the scope of 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.

Claims (18)

In a method of controlling a terminal in-device coexistence interference (IDC) in a wireless communication system,
Performing the measurement on the neighboring cell when the measurement result for the primary serving cell is greater than or equal to a predetermined reference value for all frequency bands set by the measurement setting;
Transmitting to the base station an IDC indication including only a list of unusable frequencies which are frequencies in which IDC is in progress and difficult to perform wireless communication, and a measurement result of removing IDC influence from the measurement sample from which the measurement is performed; And
And performing an IDC resolution operation based on whether the unusable frequency is a serving frequency which is a frequency associated with a serving cell within a frequency band set by the measurement setting. The method of claim 1,
The disabled frequency, if the serving frequency is a frequency associated with the serving cell within the frequency band set by the measurement setting, the IDC resolution operation is an intra-device coexistence interference control method characterized in that the TDM (Time Division Multiplexing) operation. 3. The method of claim 2,
If it is determined that a frequency division multiplexing (FDM) operation is further required for the IDC resolution operation, receiving a measurement reset to reset the measurement setting from the base station; And
And transmitting the measurement result of re-measurement to remove the IDC influence to the base station based on the measurement resetting. The method of claim 3, wherein
And resetting the measurement adds the unused frequency to the blacklist cell. The method of claim 3, wherein
And resetting the measurement removes the measurement object for the unusable frequency. The method of claim 3, wherein
And resetting the measurement changes a measurement reference value for the measurement object to a predetermined threshold value or less. The method of claim 1,
If the unusable frequency is a non-serving frequency other than a frequency associated with a serving cell within a frequency band set by the measurement setting, performing an operation of preventing a problem of a communication service occurring for the non-serving frequency. In-device coexistence interference control method comprising a. The method of claim 1,
In the measurement reset,
The measurement reset is performed on the frequency band set for the measurement result report, but the measurement reset is not performed on the frequency band not set for the measurement result report and detectable by the terminal. In-device coexistence interference control method. The method of claim 1,
Intra-device coexistence interference control method characterized in that the measurement result comprises a TDM pattern. The method of claim 9,
The TDM pattern is an in-device co-existence interference control method characterized in that the TDM pattern is applied equally to all the unusable frequency band of the terminal. The method of claim 9,
The TDM pattern includes a first TDM pattern applied equally to a serving frequency which is a frequency associated with a serving cell in the frequency band set by the measurement setting, and a frequency associated with the serving cell in the frequency band set by the measurement setting. In-device coexistence interference control method characterized in that it comprises a second TDM pattern that is applied equally to the non-serving frequency. The method of claim 9,
The TDM pattern is an in-device coexistence interference control method, characterized in that different values for each of the unusable frequencies. 13. The method of claim 12,
Intra-device coexistence interference control method further comprising the step of transmitting the number of the TDM pattern to the base station. The method of claim 9,
If the TDM pattern does not include a TDM pattern applied for a non-serving frequency other than the frequency associated with the serving cell within the frequency band set by the measurement setting,
And transmitting additional IDC assistance information including a TDM pattern applied to the non-serving frequency to the base station. In a terminal for controlling in-device coexistence interference (IDC) in a wireless communication system,
A measurement unit for performing measurement on the neighboring cell when all the frequency bands set by the measurement setting are greater than or equal to a predetermined reference value;
A transmission unit for transmitting a measurement result report including a measurement result of removing IDC influence from the measurement sample in which the measurement is performed and an unusable frequency which is a frequency in which IDC is in progress, making it difficult to perform wireless communication; And
And a controller configured to perform an IDC resolution operation based on whether the unusable frequency is a serving frequency which is a frequency related to a serving cell within a frequency band set by the measurement setting. A method for controlling in-device coexistence interference (IDC) in a base station in a wireless communication system,
For all frequency bands set by the measurement setting, when the measurement result for the main serving cell is greater than or equal to a predetermined reference value, the measurement result and IDC in progress are removed from the measurement sample for which the measurement is performed for the neighbor cell. Receiving a measurement result report from the terminal, the measurement result including an unusable frequency which is a frequency that is difficult to perform wireless communication; And
And determining an IDC resolution operation based on whether the unusable frequency is a serving frequency which is a frequency associated with a serving cell within a frequency band set by the measurement setting. 17. The method of claim 16,
And determining that the triggering of the IDC assistant information is performed based on the serving frequency when the unusable frequency includes the serving frequency. 17. The method of claim 16,
If the unavailable frequency includes only a non-serving frequency whose frequency is not related to a serving cell within the frequency band set by the measurement setting, triggering of the IDC assistant information is performed based on the non-serving frequency. In-device coexistence interference control method.

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