WO2012096527A2

WO2012096527A2 - Apparatus and method for coordinating in-device coexistence interference in a wireless communication system

Info

Publication number: WO2012096527A2
Application number: PCT/KR2012/000294
Authority: WO
Inventors: 안재현; 권기범; 정명철
Original assignee: 주식회사 팬택
Priority date: 2011-01-12
Filing date: 2012-01-12
Publication date: 2012-07-19
Also published as: WO2012096527A3

Abstract

The present description relates to an apparatus and method for coordinating in-device coexistence interference in a wireless communication system. The method of the present invention comprises the following steps: performing triggering for making a request to a base station for the coordination of interference between transmission in a first frequency band of a first network system by a terminal, and reception in a second frequency band of a second network system by said terminal; transmitting mixed support information to the base station, wherein the mixed support information includes first support information for supporting FDM scheme-based coordination of said interference in a frequency domain, and second support information for supporting TDM scheme-based coordination of said interference in a time domain; and receiving, from the base station, response information for accepting or rejecting the coordination of said interference as a response to the mixed support information. According to the present description, procedures for processing in-device coexistence interference may be simplified and easily performed, and backward compatibility between the procedures of the present invention and existing procedures may be maintained.

Description

Apparatus and method for coordinating in-device coexistence interference in a wireless communication system

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

Wireless communication systems generally use one bandwidth for data transmission. For example, the second generation wireless communication system uses a bandwidth of 200KHz ~ 1.25MHz, the third generation wireless communication system uses a bandwidth of 5MHz ~ 10MHz. To support increasing transmission capacity, the recent 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) or IEEE 802.16m continues to expand its bandwidth to 20 MHz or more. In order to increase the transmission capacity, it is necessary to increase the bandwidth. However, even when the level of service required is low, supporting a large bandwidth can cause a large power consumption.

Accordingly, a multiple component carrier system has emerged, which defines a carrier having one bandwidth and a center frequency and enables transmission and / or reception of data 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 are used to 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. Conventionally, when one terminal communicates with one network system, a user 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 a single terminal, and user convenience has been increased.

However, when one UE simultaneously communicates on a plurality of 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, in-device coexistence interference may be performed between a Bluetooth system band and an LTE system band when one terminal simultaneously supports a Bluetooth system and a Long Term Evolution (LTE) system. In-device coexistence interference may occur mainly when the separation intervals of the frequency band boundaries of heterogeneous network systems are 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, a specific method for resolving in-device coexistence interference between a terminal and a base station has not been discussed yet, and an operation procedure for this is required.

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

Another technical problem of the present invention is to provide an apparatus and method for adjusting in-device coexistence interference based on a mixed method in which an FDM method and a TDM method are mixed.

Another technical problem of the present invention is to provide an apparatus and method for transmitting hybrid assistant information supporting coordination of in-device coexistence interference in a wireless communication system.

Another technical problem of the present invention is to provide an apparatus and method for determining a method of adjusting in-device coexistence interference based on a mixed method.

According to an aspect of the present invention, there is provided a method of interference coordination by a terminal in a wireless communication system. The method triggers requesting the base station to adjust for interference caused by transmission in the first frequency band of the first network system occurring at the terminal to reception in the second frequency band of the second network system occurring at the terminal. (triggering), first assistance information supporting the interference to be adjusted in the frequency domain based on the frequency division multiplexing (FDM) scheme and the interference in the time domain based on the TDM (Time Division Multiplexing) scheme Transmitting mixed support information including second support information to support the base station and receiving response information from the base station accepting or rejecting adjustment of the interference in response to the mixed support information; .

According to another aspect of the present invention, a terminal for performing interference coordination in a wireless communication system is provided. The terminal triggers requesting the base station to adjust for interference caused by transmission in the first frequency band of the first network system occurring in the terminal to reception in the second frequency band of the second network system occurring in the terminal. Interference coordination request triggering unit for performing a; first support information for supporting the interference is adjusted in the frequency domain based on the FDM scheme and second support information for supporting the interference is adjusted in the time domain based on the TDM scheme A mixed support information generator for generating mixed support information, a mixed support information transmitter for transmitting the mixed support information, and response information for accepting or rejecting adjustment of the interference in response to the mixed support information from the base station; It includes a response information receiving unit for receiving.

According to another aspect of the present invention, there is provided a method of interference coordination by a base station in a wireless communication system. The method includes receiving mixed support information from the terminal to support interference in the frequency domain based on the FDM scheme or in the time domain based on the TDM scheme, adjusting the interference among the FDM scheme and the TDM scheme. Evaluating a method that is more suitable for performing the adjustment of the interference based on one of the methods selected by the evaluation, or if the FDM method and the TDM method are not suitable by the evaluation. And sending response information indicating the rejection of the adjustment to the terminal. At this time, the interference causes transmission in the first frequency band of the first network system occurring in the terminal to reception in the second frequency band of the second network system occurring in the terminal.

According to another aspect of the present invention, there is provided a base station for performing interference coordination in a wireless communication system. The base station is a mixed support information receiver for receiving from the terminal the mixed support information to adjust the interference in the frequency domain based on the FDM scheme or in the time domain based on the TDM scheme, the FDM scheme and the TDM scheme An interference adjustment performing unit for evaluating a method more suitable for coordinating interference, and performing the adjustment of the interference based on any one method selected by the evaluation, the method of the interference based on any one method selected by the evaluation. And a response information transmitter for transmitting to the terminal response information indicating that adjustment is performed or rejecting adjustment of the interference if neither the FDM scheme nor the TDM scheme is suitable by the evaluation. At this time, the interference causes transmission in the first frequency band of the first network system occurring in the terminal to reception in the second frequency band of the second network system occurring in the terminal.

According to the present invention, a procedure for dealing with in-device coexistence interference can be simplified, easy to implement, and maintain backward compatibility with other existing procedures. In addition, the information on the in-device coexistence interference exchanged between the terminal and the base station can be clearly defined and the interference can be efficiently solved.

1 illustrates a wireless communication system to which embodiments of the present invention are applied.

2 is an explanatory diagram for explaining in-device coexistence interference.

3 shows an example of in-device coexistence interference from an ISM transmitter to an LTE receiver.

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 interference using an FDM scheme.

6 is an explanatory diagram showing another example of mitigating in-device interference using the FDM scheme.

7 is an explanatory diagram illustrating an example of mitigating in-device interference using a TDM scheme.

8 shows transmission / reception timings on a time axis of an LTE band and an ISM band using a TDM scheme.

9 is a flowchart illustrating a method for adjusting in-device coexistence interference based on a mixing scheme according to an embodiment of the present invention.

10 is a diagram illustrating second support information according to an embodiment of the present invention.

11 is a view for explaining second support information according to another embodiment of the present invention.

12 is a diagram for explaining second support information according to another embodiment of the present invention.

13 is a flowchart illustrating a method of performing interference coordination by a terminal according to an embodiment of the present invention.

14 is a flowchart illustrating a method of performing interference coordination by a terminal according to another embodiment of the present invention.

15 is a flowchart illustrating a method of performing interference coordination by a base station according to an embodiment of the present invention.

16 to 18 illustrate a method of adjusting in-device coexistence interference by frequency shifting or shaping according to an embodiment of the present invention.

19 is a diagram illustrating an operation of a UE in DRX mode when response information is a DRX command message according to an embodiment of the present invention.

20 is a flowchart illustrating a method of performing interference coordination by a base station according to another embodiment of the present invention.

21 is a block diagram illustrating an apparatus for coordinating in-device coexistence interference according to an embodiment of the present invention.

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

In addition, in describing the component of this specification, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. 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 between components It will be understood that may be "connected", "coupled" or "connected".

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. Here, the WLAN is a device that supports the IEEE 802.11 technology, which is a wireless standard, and IEEE 802.11 may be mixed with a Wi-Fi system and its name.

Terminal 10 may be located within the coverage of multiple networks such as cellular networks, wireless LANs, broadcast networks, satellite systems, and the like. In order for the terminal 10 to access various networks and various services such as the base station 20, the WLAN access point 30, the GSP 40, and the like regardless of time and place, the terminal 10 includes a plurality of radio transceivers. ). For example, a smart phone includes an LTE, WiFi, Bluetooth transceiver and a GPS receiver. As such, the design of the terminal 10 is becoming more complicated in order to integrate more and more transceivers in the same terminal 10 while maintaining good performance. This may increase the possibility of in-device coexistence interference.

Hereinafter, downlink means communication from the base station 20 to the terminal 10, and uplink 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 called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), and a wireless device. . The base station 20 refers to a fixed station that communicates with the terminal 10, and includes a base station (BS), a base transceiver system (BTS), an access point, an femto base station, and a relay. It may be called in other terms such as relay.

There is no limitation on the multiple access scheme applied to the wireless communication system. Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA (SC-FDMA), OFDM-FDMA, OFDM-TDMA For example, various multiple access schemes such as OFDM-CDMA may be used. The uplink transmission and the downlink transmission may use a time division multiplexing (TDM) scheme transmitted using different times, or frequency division multiplexing (FDM) transmitted using different frequencies. Manner may be used.

Meanwhile, carrier aggregation (CA) supports a plurality of component carriers and is also referred to as spectrum aggregation or bandwidth aggregation. Individual unit carriers bound by carrier aggregation are called component carriers (CC). Each CC is defined by a bandwidth and a center frequency. Carrier aggregation is introduced to support increased throughput, to prevent cost increase due to the introduction of wideband radio frequency (RF) devices, and to ensure compatibility with existing systems. For example, if five CCs are allocated as granularity in a carrier unit having a 5 MHz bandwidth, a bandwidth of up to 25 MHz may be supported. Hereinafter, a multiple carrier system refers to a system supporting carrier aggregation. The wireless communication system of FIG. 1 may be a multi-carrier system.

According to carrier aggregation, a system frequency band is divided into a plurality of carrier frequencies. Here, the carrier frequency means a center frequency of a cell. A cell may mean a downlink CC and an uplink CC. Alternatively, the cell may mean a combination of a downlink CC and an optional uplink CC. In general, when carrier aggregation is not considered, uplink and downlink CCs always exist in pairs in one cell.

2 is an explanatory diagram for explaining in-device coexistence interference.

Referring to FIG. 2, the terminal 20 includes an LTE RF 21, a GPS RF 22, and a Bluetooth / WiFi RF 23. Transmit and receive

antennas

24, 25, 26 are connected to each RF. That is, several types 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 high filtering technology 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, (1) is an example in which a transmission signal of the LTE RF 21 causes in-device coexistence interference with respect to the GPS RF 22 and the Bluetooth / WiFi RF 23, and (2) the Bluetooth / WiFi RF ( 23 is an example of causing in-device coexistence interference with respect to the LTE RF 21. This problem is explained in more detail in FIG. 3.

3 illustrates an example of in-device coexistence interference from an ISM transmitter to an LTE receiver. The Industrial, Scientific and Medical (ISM) band represents a band that can be freely used in the industrial sciences and medical fields without a license.

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.

Referring to FIG. 4, band 40, band 7, and band 38 are LTE bands. Band 40 occupies 2300-2400 MHz band in TDD mode, and band 7 occupies 2500-2570 MHz band as uplink in FDD mode. Band 38 occupies 2570-2620 MHz band in TDD mode. Meanwhile, the ISM band is used as a WiFi channel and a Bluetooth channel and occupies 2400 to 2483.5 MHz. In this case, the situation where in-device coexistence interference occurs is shown in the following table.

Table 1

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 transmission of a causes in-device coexistence interference with respect to reception of b. Thus, in band 40, transmission in the ISM band causes in-device coexistence interference for downlink TDD reception (LTE TDD DL Rx) of the LTE band. A filtering scheme can mitigate in-device coexistence interference to some extent, but it is not enough. In addition to the filtering method, applying the FDM method or the TDM method can more effectively alleviate in-device coexistence interference.

Referring to FIG. 5, the LTE band may be moved 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 a radio link failure (RLF) procedure.

Referring to FIG. 6, the ISM band may be reduced and moved away from the LTE band. However, backward compatibility problems may arise in this manner. In the case of Bluetooth, the backward compatibility problem may be solved to some extent due to the adaptive frequency hopping mechanism, but in the case of WiFi, the backward compatibility problem may be difficult to solve.

Referring to FIG. 7, if the reception time in the LTE band does not overlap with the transmission time in the ISM band, in-device coexistence interference may be avoided. For example, when the signal of the ISM band is transmitted at t ₀ , the signal of the LTE band is received at t ₁ . As described above, transmission / reception timing of the LTE band and the ISM band using the TDM scheme in the time axis may be represented as shown in FIG. 8. In this manner, in-device coexistence interference can be avoided without moving between bands of the LTE band and the ISM band. In FIG. 8, a section in which no signal is transmitted in each band is referred to as a blank transmission region.

As described above, the TDM method and the FDM method have unique characteristics. The TDM method can be applied to an environment in which only one carrier band is set in a terminal, but since time resources are divided between network systems, interference is too severe or communication is almost impossible depending on the type of traffic used in the terminal. You can get to Although the FDM scheme cannot be applied to an environment in which only one carrier band is set in the terminal, the interference is less sensitive to the type of traffic than the TDM scheme because it can completely avoid the band in which the interference occurs. Complementing the strengths and weaknesses of the TDM and FDM schemes, and implementing a mixture of the two schemes, allows for more efficient coordination of interference.

In connection with the present invention, the FDM scheme and the TDM scheme may be used as a technique for avoiding in-device coexistence interference. In the FDM scheme, when interference occurs between the first frequency band of the first network system and the second frequency band of the second network system, the FDM scheme shifts the frequency band of any one network system to adjust in-device coexistence interference. . Meanwhile, the TDM scheme is a method of adjusting in-device coexistence interference by separating a transmission time of a first network system and a reception time of a second network system from each other.

Referring to FIG. 9, when in-device coexistence interference is detected, the terminal triggers a request for coordination of in-device coexistence interference (S900). In-device coexistence interference is a case in which transmission from a terminal to a peripheral device communicating with Bluetooth or WiFi causes interference to reception from a base station of the LTE system of the terminal. Alternatively, in-device coexistence interference is a case where the transmission from the terminal to the LTE system causes interference to reception from a peripheral device communicating via Bluetooth or WiFi.

For example, in the situation as shown in FIG. 2, the terminal detects whether a transmission signal of another RF interferes with a received signal of the LTE RF. As an example, the terminal may detect in-device co-existence interference using a received signal to interference noise ratio (SINR). As another example, the terminal may detect in-device coexistence interference using RSRP (Reference Signal Received Power) or RSRQ (Reference Signal Received Quality). For example, suppose that a terminal transmits a signal y through another RF such as WiFi while receiving a signal x from a base station through LTE RF. At this time, when the SINR of the signal y is greater than a predetermined threshold and acts as an interference to the signal x, the terminal may detect in-device coexistence interference. If interference is detected, the terminal triggers a request for coordination of interference.

When the request for coordination of interference is triggered, the terminal transmits hybrid assistance information (HAI) to the base station to assist in reducing, avoiding, or removing interference in the frequency domain or time domain. Transmit (S905). Hereinafter, operations for mitigating, avoiding, or eliminating interference are collectively referred to as interference coordination.

The mixed support information includes first support information supporting interference coordination based on FDM scheme and second support information supporting interference coordination based on TDM scheme. The second support information may include a TDM pattern. The terminal may further include an identifier identifying the first assistance information and the second assistance information in the mixed assistance information so that the base station can distinguish the first assistance information from the second assistance information. In this case, the identifier may be transmitted through a medium access control (MAC) message or physical layer signaling. Alternatively, the terminal may configure the first assistance information and the second assistance information as information separated by an information element (IE) unit so that a base station can distinguish the first assistance information and the second assistance information. have. The information element may be included in a Radio Resource Control (RRC) message.

The mixed assistance information may further include an applying indicator indicating a frequency band or a cell to which the second assistance information is to be applied according to the TDM scheme. If there are two or more frequency bands or cells in which coexistence interference occurs in the device, interference coordination should be performed according to separate second support information (or TDM pattern) for each band or cell. That is, there may be a plurality of TDM patterns for interference coordination. Accordingly, the terminal should inform the base station which TDM pattern is applied to the interference of which band or cell, and the information used for this is the application indicator.

The type of the mixed support information may be a message generated in a radio resource control (RRC) layer or a medium access control (MAC) layer, or may be physical layer signaling. Detailed description of the mixed support information will be described later.

When receiving the mixed support information, the base station regards the mixed support information as an interference coordination request from the terminal and performs an evaluation procedure for the request (S910). The evaluation procedure may be performed separately for each frequency band (or cell) in which interference occurs. Alternatively, it may be performed collectively for the entire frequency band (or cell) in which interference occurs.

How the base station performs the evaluation procedure can be broken down as follows. First, the base station assesses which interference coordination scheme is appropriate to use. As an example, the base station may evaluate based on priority. That is, the applicability of the first interference coordination scheme is first evaluated, and then the applicability of the second interference coordination scheme is evaluated. For example, the base station may first evaluate whether the FDM scheme may be applied to interference coordination, and may evaluate whether the TDM scheme may be applied when the FDM scheme is not applicable. Alternatively, on the contrary, the applicability of the TDM scheme may be evaluated first, followed by the applicability of the FDM scheme.

As another example, the base station may evaluate the FDM scheme and the TDM scheme simultaneously. That is, the base station evaluates the applicability of the FDM scheme and the applicability of the TDM scheme simultaneously or in parallel. The cost function described below can be used for this evaluation.

The base station selects an interference coordination scheme determined to be suitable by the evaluation, and performs interference coordination based on the selected interference coordination scheme and supporting information corresponding thereto. On the other hand, different interference may occur in different bands. In this case, the base station may apply the same interference coordination scheme or different interference coordination scheme uniformly to each band. For example, suppose that in-device coexistence interference occurs in all of CC1, CC2, and CC3 while the terminal performs communication through CC1, CC2, and CC3. At this time, the base station may apply the FDM scheme to CC1, CC2, and the TDM scheme to CC3. Alternatively, the base station may apply the FDM method or the TDM method to all of CC1, CC2, and CC3. As such, the base station may apply an interference coordination scheme to each band where interference occurs or may uniformly apply the same coordination scheme.

If both interference coordination schemes are deemed inappropriate, the base station may not perform interference coordination. In this case, the base station may generate response information indicating no operation or rejecting interference coordination.

The base station transmits the response information to the terminal (S915). The response information may indicate accepting or rejecting the interference coordination request.

The response information indicating the acceptance of the interference coordination request may have a different form depending on whether the method selected in the evaluation procedure is an FDM or TDM method. For example, when the FDM scheme is selected, the response information indicating that the interference coordination request is accepted may include a cell reconfiguration message in a cell reconfiguration procedure, a handover command message in a handover procedure, and an interference. It may be a frequency shift indicator instructing to shift this occurring band by a certain frequency offset, or a frequency shaping indicator instructing to shape a portion of the band where interference occurs. have.

As another example, when the TDM scheme is selected, the response information indicating that the interference coordination request is accepted may be a DRX reconfiguration message, a DRX command message, or an ACK (acknowledgement) signal in a discontinuous reception (DRX) procedure. have.

The response information indicating rejection of the interference coordination may be a non-acknowledgement (NACK) signal. Thus, if the complementary advantages and disadvantages of the TDM scheme and the FDM scheme are well complemented and the two schemes are implemented, the interference can be more efficiently adjusted.

Hereinafter, the first support information, the second support information, the identifier, and the application indicator which may be included in the mixed support information will be described in detail.

1. First Support Information

The first assistance information includes a measurement result. That is, the first assistance information includes measurement results such as Signal to Interference plus Noise Ratio (SINR), Reference Signal Received Power (RSRP), or Reference Signal Received Quality (RSRQ). As another example, the assistance information includes an avoiding indicator indicating that the avoidance of in-device coexistence interference based on the FDM scheme is required along with the measurement result.

In the case of RSRQ, this is obtained as an average over a certain period (eg 200 ms). Since in-device coexistence interference is irregular interference occurring in different wireless systems, the average value may vary greatly depending on the situation of the device. Therefore, the form of the first assistance information reported from the terminal in the situation of in-device coexistence may be different from that of the non-in-device coexistence. The first assistance information reported in the in-device coexistence situation may be classified into four types as follows.

(1) First assistance information including measurement results reflecting in-device coexistence interference: In the form of such support information, in-device coexistence interference is reflected in the measurement result itself. For example, assume that downlink component carriers CC1, CC2, CC3 are configured in the terminal, and in-device coexistence interference occurs in CC1. At this time, the RSRQs of CC1, CC2 and CC3 are shown in Table 2, respectively.

TABLE 2

CC	RSRQ
CC1
CC2
CC3

Referring to Table 2, S _n is the strength of the received signal of CCn, I _n is the strength of the interference signal acting on CCn, N _n is the strength of noise acting on CCn. Here, if the intensity of in-device coexistence interference occurring in CC1 is I ', the measurement results included in the first support information are shown in Table 3.

TABLE 3

CC	RSRQ
CC1
CC2
CC3

Referring to Table 3, the addition of I 'to the denominator of the measurement result in CC1 is different from Table 2.

(2) First supporting information including measurement results of separate RSRQ and in-device co-existence interference. In addition to the RSRQ, the strength of the interference is used as a separate measurement result. In this case, the measurement results can be shown in Table 4.

Table 4

CC	RSRQ
CC1
CC2
CC3

Referring to Table 4, the measurement result for CC1 includes both S ₁ / (I ₁ + N ₁ ) and I. That is, the measurement result included in the first support information is in a form in which I 'is additionally reported to the previously reported RSRQ.

(3) First supporting information including a usable band indicator and an unusable band indicator: CC in which in-device coexistence interference occurs is a non-usable frequency band from the terminal's point of view. On the other hand, CC which does not generate in-device coexistence interference is a usable frequency band from the terminal's point of view. Accordingly, the terminal may configure first assistance information including an available band indicator indicating a CC of an available frequency band and an unavailable band indicator indicating a CC of an unavailable frequency band. In the example of Table 4, the unavailable band indicator is {1} and the available band indicator is {2, 3}.

Here, the usable band indicator and the unusable frequency band indicator include indicating a frequency band corresponding to any serving cell composed of at least one CC. For example, one downlink CC and a downlink CC linked with SIB2 may be configured as one serving cell, or one downlink CC may be configured as one serving cell.

(4) First support information including the strength of in-device coexistence interference: If in-device coexistence interference occurs, the terminal configures the first support information to indicate the strength of in-device coexistence interference with respect to the CC. For example, the intensity of in-device coexistence interference = {I ', 0, 0} is mapped to CC1, CC2, CC3 in order from the left. Alternatively, the terminal may configure the first assistance information in such a manner as to inform information about the frequency band itself, such as a possible region and an impossible region in the actual frequency band. Here, one CC may configure one serving cell, and one connected downlink CC and uplink CC may configure one serving cell. The scheme for indicating the strength of in-device coexistence interference may be configured in the form of a serving cell for CC.

(5) First supporting information including RSRQ measurement result in which in-device coexistence interference has been removed:

Here, the RSRQ value from which the coexistence interference is removed in the device refers to the RSRQ value filtered through the measurement samples excluding the measurement sample affected by the coexistence interference in the terminal. That is, the RSRQ value from which the in-device coexistence interference is removed is a value that is not greatly affected by the influence of the in-device coexistence interference.

(6) first supporting information including an RSRQ measurement result in which in-device coexistence interference is removed and an RSRQ measurement result including in-device coexistence interference:

Here, the RSRQ value including in-device coexistence interference refers to an RSRQ value filtered through a state in which measurement samples affected by the coexistence interference are not excluded. That is, the value of RSRQ including in-device coexistence interference will be a value that is affected by the influence of in-device coexistence interference. Here, the RSRQ value including in-device coexistence interference may be a result of filtering only measurement samples affected by coexistence interference, and measurement samples affected by coexistence interference and measurement samples not affected by coexistence interference. It may be the result of filtering the measurement samples including both.

(7) First supporting information including the RSRQ measurement result in which the in-device coexistence interference is removed and the RSRQ measurement result including the in-device coexistence interference in the form of a difference value:

Here, the RSRQ value including the in-device coexistence interference may be raised based on a value not including the in-device coexistence interference. For example, when the RSRQ value including the in-device coexistence interference is 8 dB and the RSRQ value including the in-device coexistence interference is 5 dB, the first support information may be configured to 8 dB and -3 dB, respectively.

The form of the first support information may be configured in one of the above-described embodiments, or may be in the form of a combination of one or more embodiments. For example, it may further include a measurement result of the RSRQ in which in-device coexistence interference is removed in addition to the usable band indicator and the unusable band indicator.

2. Secondary Support Information

The second assistance information may be defined in various ways depending on the viewpoint. For convenience of description, the transmission Tx in the first frequency band of the first network system interferes with the reception Rx in the second frequency band of the second network system at every period of the interval T ₁ to T ₂ . Suppose, and do not cause interference in the non-interference interval T ₂ ~ T ₃ hours. The first network system is an aggressor system because it provides an interference position, and the second network system may be called a victim system because it is an interference site.

If the base station knows the interference interval T ₁ ~ T ₂ or the non-interference interval T ₂ ~ T ₃ , the base station may adjust the interference based on the TDM scheme in consideration of these intervals.

For example, the base station may schedule the Tx to occur in the non-interference intervals T ₂ to T ₃ rather than the interference intervals T ₁ to T ₂ . On the other hand, since Rx continues to occur in the conventional interference section T ₁ to T ₂ , scheduling is given to a higher priority system than the aggregator system. In this case, the base station may be a base station of an aggregator system.

Alternatively, the base station may schedule the Rx to occur in the non-interference intervals T ₂ to T ₃ rather than the interference intervals T ₁ to T ₂ . On the other hand, since Tx continues to occur in the conventional interference section T ₁ to T ₂ , scheduling is a higher priority for the aggregator system than the Victim system.

As such, which system is to be prioritized to perform interference coordination according to the TDM scheme may be previously promised to the terminal and the base station or may be determined by the base station by its own scheduling. For example, when the aggregator system is called a WiFi system and transmits important information such as system information in the interference intervals T ₁ to T ₂ , the system information has a relatively high priority. Therefore, if the interference interval T ₁ ~ T ₂ The WiFi system cause interference with other systems, the base station so that the transmission and reception of the other systems will not occur in the interference interval T ₁ ~ T _2.

Therefore, from the viewpoint of a low priority system, the interference section may be defined as an unusable section and the noninterference section may be defined as a usable section. In any case, when the terminal informs the base station of the interference section (or unusable section) or the non-interference section (available section), the base station may perform interference coordination with reference to the base station.

From this point of view, the second assistance information may be information indicating an interference section (or an unusable section) or information indicating a non-interfering section (or available section). The second assistance information may be classified into four types as follows.

(1) second supporting information for indicating an interference section or a non-interference section in the form of a bitmap for a predetermined time period;

Referring to FIG. 10, the frame structure of LTE includes a plurality of subframes, and one subframe is 1 ms. When the interference section is defined in units of subframes, one bit constituting the bitmap corresponds to one subframe. For example, if the bitmap is '1', it indicates that the corresponding subframe is an interference section, and if the bitmap is '0', it indicates that the corresponding subframe is a non-interference interval. Of course, what the bitmaps '1' and '0' indicate may be defined as opposed to the above description. In FIG. 10, an interference section is defined as a unit of a subframe, but this is only an example, and n subframes may be bundled to correspond to one bit as one interference section. The interference interval does not necessarily need to be a subframe unit, but may be defined in any time unit such as 1.5 ms or 0.8 ms. Furthermore, in view of the availability or unavailability of the LTE system, the bitmap '1' may be defined as an available section and the bitmap '0' may be defined as an unavailable section.

The bitmap indicating the uplink / non-interference interval of the uplink and the bitmap indicating the interference / non-interference interval of the downlink may be distinguished, and the interference section is one bitmap regardless of the uplink and the downlink. It may also indicate a non-interfering interval.

(2) second assistance information indicating a time period that cannot be scheduled (or a time period that can be scheduled);

Referring to FIG. 11, a scheduled interval and an unscheduled interval are repeated for a certain period P for a terminal. Here, the scheduling section refers to a section in which a scheduling is possible for a terminal in a specific network system, and the non-scheduling section refers to a section in which a scheduling is not possible for a terminal in a specific network system.

Accordingly, the terminal may transmit information regarding any one of the scheduling period and the non-scheduling period or information about both of them as the second support information to the base station.

(3) second assistance information indicating a scheduling interval or a nonscheduling interval within a DRX period;

Referring to FIG. 12, the terminal may operate in a DRX mode that does not receive a signal for a predetermined time in accordance with a constant DRX cycle. Parameters for determining the DRX mode include a DRX cycle, an on-duration time, and an inactivity timer. The DRX cycle is a cycle in which the UE wakes up in the DRX mode. Activity time is the time to wake up periodically.

The terminal may determine whether there is a PDCCH scheduled for the active time. If there is a scheduling for the terminal during the active time, the terminal remains awake until the scheduling expires. When the scheduling expires, the inactivity timer expires from the last received PDCCH scheduling. On the other hand, if there is no PDCCH scheduling during the active time, the terminal enters the inactive time of the DRX mode again after the active time.

Here, in order for the transmission or reception timing of the UE in DRX mode to be changed by interference coordination based on the TDM scheme, the change should be made at least within a range that does not affect the operation of the DRX cycle. For example, if there is a constraint that the transmission or reception of the terminal should occur during the active time and should not occur during the inactive time, the terminal needs to inform the base station of its active time or inactive time. This is so that the base station does not allow scheduling for the terminal during inactivity time during interference coordination.

As one example, the second assistance information includes information regarding an active time or inactive time itself. As another example, the second assistance information includes ratio information of inactivity time for the DRX cycle. For example, if the DRX cycle is 4ms and the inactivity time is 3ms, the ratio of inactivity time to the DRX cycle is 3/4, and the ratio information is included in the second support information.

(4) Second support information including non-scheduling interval increase information: The increase or decrease may be transmitted with respect to the nonscheduling interval increase information. It may be increased in multiples, or it may increase or decrease in the form of addition. When increasing or decreasing in multiples, the second assistance information may be given in the form of N or 1 / N. For example, suppose 1/4 is the unscheduled interval for the entire DRX cycle. If the increase in multiples is given as 2, the nonscheduling interval will be 1/2. If the increase in multiples is 1/2, the nonscheduling interval will be 1/8. Increasing in the form of addition or subtraction will be the case where a given value is added or subtracted. For example, given 1/4, it would be 1/4 + 1/4 = 1/2; given -1/8, it would be 1/4-1/8 = 1/8.

(5) Secondary support information including an ACK indicator, which corresponds to the following case. When the UE requests an FDM based interference coordination request, but the base station recommends TDM based interference coordination, the UE triggers the TDM based interference coordination request and includes the second assistance information including an ACK indicator. Send to the base station.

The second assistance information may be configured and transmitted by dividing uplink and downlink, or may be configured and transmitted as one without being distinguished.

3. Applying indicator

The application indicator indicates a frequency band or cell. Thus, information related to frequency or cell can be used as an application indicator. For example, information on a cell index, a frequency band index, or the frequency band value itself may be an application indicator. An example of the frequency band index is a band index defined in International Mobile Telecommunication (IMT). That is, the band index may be given as # 40, # 7, # 13, # 1.

The application indicator may or may not be included in the mixed support information.

First, when the application indicator is included in the mixed support information, the application indicator is used to explicitly indicate the interference of the frequency band or cell to which the second support information is applied. As an example, when interference coordination based on the TDM scheme is performed for _a single frequency band f _a , the second assistance information is applied to f _a indicated by the application indicator. As another example, interference coordination based on a TDM scheme is performed for each of _a plurality of frequency bands f _a and f _b , and the mixed support information includes a second 'support information, a second''support information, and a first indicating f _a . Suppose we include a coverage indicator and a second coverage indicator that points to f _b . Since the first application indicator corresponds to the second 'assistance information, the second' assistance information is applied to f _a . Similarly, since the second application indicator corresponds to the second '' support information, the second '' support information is applied to f _b .

Next, if the application indicator is not included in the mixed support information, there must be an implicit protocol regarding which frequency band (or cell) the second support information is used for coordination of interference. This depends on whether there is one or more frequency bands (or cells) where interference occurs.

i) TDM scheme is applied only for a single frequency band (or cell)

It is interpreted that the second assistance information is applied to the current frequency band (or cell) in which the terminal is operating.

ii) when the TDM scheme is applied for multiple frequency bands (or cells)

As an example, the base station may sequentially interpret and apply second assistance information to a frequency band (or cell) in which interference occurs. For example, when interference occurs in the frequency bands f ₁ , f ₄ , and f ₅ , the second 'support information', the second 'support information', and the second '''support information sent are sequentially transmitted through f ₁ , It can be applied to interference coordination for f ₄ , f ₅ .

As another example, the base station may apply and interpret only one piece of second assistance information for all frequency bands (or cells) in which interference occurs.

13 is a flowchart illustrating a method of performing interference coordination by a terminal according to an embodiment of the present invention. This is a case where the terminal does not have a timer for receiving response information.

Referring to FIG. 13, the terminal detects occurrence of in-device coexistence interference and triggers an interference coordination request (S1300). As an example, the terminal may detect in-device coexistence interference by using a received signal-to-interference noise ratio (SINR). As another example, the terminal may detect in-device coexistence interference using RSRP or RSRQ.

If the interference coordination request is triggered, the terminal transmits the mixed support information for interference coordination to the base station (S1305). The mixed support information includes the first support information and the second support information. The mixed support information may further include an identifier for distinguishing the first support information from the second support information. Alternatively, the first assistance information and the second assistance information may be divided in units of information elements. In addition, the mixed support information may further include an application indicator indicating a frequency band or a cell to which the second support information is applied according to the TDM scheme.

The terminal receives the response information from the base station (S1310). The response information indicating the acceptance of the interference coordination request may have a different form depending on whether the method selected in the evaluation procedure is an FDM or TDM method. For example, when the FDM scheme is selected, the response information indicating that the interference coordination request is accepted may include a cell reconfiguration message in the cell reconfiguration procedure, a handover command message in the handover procedure, and a frequency offset of a band in which the interference occurs. It may be a frequency shift indicator indicating to shift by as much as possible, or a frequency shaping indicator indicating to shape a portion of the band where interference occurs.

As another example, when the TDM scheme is selected, the response information indicating that the interference coordination request is accepted may be a DRX reconfiguration message, a DRX command message, or an ACK in the DRX procedure.

On the other hand, the response information indicating the rejection of interference coordination may be NACK.

14 is a flowchart illustrating a method of performing interference coordination by a terminal according to another embodiment of the present invention. This is a case where the terminal operates a timer for receiving response information.

Referring to FIG. 14, steps S1400 and S1405 are the same as steps S1300 and S1305, respectively. After transmitting the mixed support information, the terminal drives the timer (S1410). It is determined whether the terminal receives the response information from the base station before the timer expires (S1415). If the terminal receives the response information before the timer expires, the terminal performs interference coordination (S1420). The interference coordination here depends on the interference coordination scheme determined by the response information. If the terminal does not receive the response information before the timer expires, the terminal determines whether the timer has expired (S1425). If the timer expires without the terminal receiving the response information, the terminal retries the interference coordination request or terminates the interference coordination procedure (S1430). If the timer has not expired, the terminal determines whether the response information is received again (S1415).

15 is a flowchart illustrating a method of performing interference coordination by a base station according to an embodiment of the present invention. The method of performing interference coordination of FIG. 15 may be individually applied to each frequency band (or cell) in which interference occurs. Alternatively, it may be applied collectively to the entire frequency band (or cell) where interference occurs. For example, in the case where the cells configured for the terminal are CC1, CC2, CC3, and all CC1, CC2, CC3 undergo ICO, the interference coordination is individually applied as CC1: FDM, CC2: TDM, CC3: FDM It may be applied, or may be applied collectively such as CC1, CC2, CC3: FDM.

Referring to Figure 15, the base station receives the mixed support information from the terminal (S1500). The mixed support information includes first support information and second support information. The mixed support information may further include an identifier or an application indicator. The base station first evaluates whether the FDM scheme is applicable to interference coordination according to the priority (S1505). Evaluation criteria are as follows.

The base station can evaluate the applicability of the FDM scheme through the capacity of available resources in an avoiding band. The band indicated by the usable band indicator is called an avoiding band because it can avoid in-device coexistence interference. The base station calculates the capacity of available resources in the avoiding band. The capacity of available resources may refer to the amount of available radio resources except for radio resources allocated by the base station for other terminals in the avoiding band. If the capacity of the available resources of the avoiding band is not sufficient, the base station will not accept the mobility (mobility) of the terminal according to the FDM scheme. On the other hand, if the capacity of the available resources of the avoiding band is sufficient, the base station may perform interference coordination by accepting the mobility (mobility) of the terminal to the avoiding band.

As another example, the base station may evaluate the applicability of the FDM scheme based on measurement results such as RSRP or RSRQ. Moving to a low frequency band of RSRP or RSRQ may be an undesirable situation from the viewpoint of the base station and the terminal. Therefore, in view of the determination of the capacity of available resources and the priority of RSRP / RSRQ, even if the avoidance band is estimated to have the capacity of available resources, if the value of RSRP or RSRQ is too low, the base station is assigned to the avoidance band to the terminal. You cannot accept the move of.

If it is determined that interference coordination based on the FDM scheme is possible according to the above evaluation criteria, the base station performs interference coordination based on the FDM scheme (S1510). The first assistance information is used for interference coordination. The base station transmits response information indicating acceptance to the terminal (S1525). Although step S1525 is shown here as being performed later than step S1510, this is merely an example, and of course, step S1510 may be performed later or simultaneously with step S1525. Here, the response information indicating acceptance may be configured in any one form of a cell reconfiguration message, a handover message, a frequency shift indicator, and a frequency shaping indicator. Alternatively, the response information indicating acceptance may include ACK.

If the response information is accompanied by a specific operation such as a cell reconfiguration or an RRC reconfiguration message, it may be determined whether the operation according to the request is implicitly accepted or rejected depending on how the operation is performed. For example, assume that interference occurs in a plurality of frequency bands (or cells) CC1 and CC2. When the base station transmits the RRC reconfiguration message for changing the CC1, CC2, CC3 set to the terminal as the response information to CC2, CC3, CC4, the terminal accepts the interference coordination request for CC1, the interference coordination request for CC2 It can be judged as rejected.

Frequency shifting and frequency shaping are described in Figures 16-18.

Referring to FIG. 16, in the first network system, the band of CC1 is 2.55 to 2.57 GHz, the band of CC2 is 2.61 to 2.63 GHz, and the band of CC3 is 2.63 to 2.65 GHz. The frequency band of the second network system is 2.51 to 2.56 GHz, which overlaps with the CC1 in the 2.55 to 2.56 GHz band, which may cause in-device coexistence interference in this band. Here, the first network system may be a 3rd Partnership Project (3GPP) Long Term Evolution (LTE) system, and the second network system may be Bluetooth or WiFi. When the terminal sends assistance information to the base station due to in-device coexistence interference, the base station transmits response information indicating acceptance or rejection to the terminal.

As an example, the base station may shift a band in which interference occurs, which is called a frequency shift. That is, the base station shifts CC1 of the first network system, which is a band where interference occurs, by an offset of 0.02 GHz as shown in FIG. 17. Accordingly, the band of CC1 is changed to 2.57 to 2.59 GHz, and in-device coexistence interference can be eliminated between the CC1 and the second network system. Meanwhile, the base station notifies the terminal of the frequency shift as response information, which is called a frequency shift indicator. This may be an RRC message, a MAC message or physical layer signaling.

As another example, the base station may shape a band in which interference occurs, which is called frequency shaping. That is, the base station cuts out the portion causing the interference with the band of the second network system in CC1 by 0.01 GHz as shown in FIG. In this case, cutting a part of the frequency band may change the physical filtering characteristic (for example, the number of taps), or may mean that the base station restricts scheduling of resources for the band. That is, resource allocation for the terminal is limited to the F _x band.

By frequency shaping, the band of CC1 is changed to 2.56 ~ 2.57 GHz, and in-device coexistence interference can be eliminated between CC1 and the second network system. Meanwhile, the base station notifies the terminal of the frequency shaping as response information, which is called a frequency shaping indicator. This may be an RRC message, a MAC message or physical layer signaling.

Referring back to FIG. 15, if it is determined in step S1505 that the FDM scheme is not applicable, the base station evaluates whether the TDM scheme is applicable (S1515). If it is determined that interference coordination based on the TDM scheme is possible, the base station performs interference coordination based on the TDM scheme (S1520). The second assistance information is used for interference coordination based on the TDM scheme. As an example of interference coordination, the base station may perform scheduling based on the interference interval and the non-interference interval. For example, the base station may be scheduled so that transmission or reception of the terminal does not occur in the interference interval, but may be scheduled in the non-interference interval.

As another example of interference coordination, the base station performs a DRX procedure. This is a case where the UE operates in the DRX mode and the support information received from the UE indicates a scheduling period or a non-scheduling period in the DRX period. The discontinuous reception procedure may be a DRX command or a DRX reconfiguration. In particular, when performing interference coordination with a DRX command, the terminal may operate as shown in FIG. 19. Referring to FIG. 19, when PDCCH scheduling occurs in a DRX cycle, the UE maintains an active time. After the DRX command is given, the terminal enters inactivity time. On the other hand, when performing interference coordination as a DRX reconfiguration procedure, the base station may adjust the interference by changing the DRX configuration parameter.

Thereafter, the base station transmits response information indicating acceptance to the terminal (S1525). As an example, the response information indicating acceptance may be a DRX reconfiguration message. As another example, the response information indicating acceptance may be a DRX command message. As another example, response information indicating acceptance may include an ACK.

If it is determined in step S1515 that the TDM scheme is not applicable, the base station transmits response information indicating rejection to the terminal (S1530). In this case, the response information indicating rejection may include second support information (or TDM pattern) of a new parameter or may include a NACK. Or, the base station may not transmit the response information itself.

If the response information includes ACK or NACK, it should be distinguished whether the ACK or NACK is for the TDM scheme or the FDM scheme. Accordingly, the response information may further include method identification information for identifying which method the corresponding ACK or NACK relates to. For example, if the ACK for the TDM scheme and the NACK for the FDM scheme, the base station transmits identification information indicating the TDM scheme and first scheme identification information including the ACK, and identifies the FDM scheme. The second method identification information including the NACK is transmitted. Alternatively, the base station may include one piece of information including the combination of the first type identification information and the second type identification information in response information and transmit the same.

20 is a flowchart illustrating a method of performing interference coordination by a base station according to another embodiment of the present invention. 20 may be applied to each frequency band (or cell) in which interference occurs. Alternatively, it may be applied collectively to the entire frequency band (or cell) where interference occurs. For example, in the case where the cells configured for the terminal are CC1, CC2, CC3, and all CC1, CC2, CC3 undergo ICO, the interference coordination is individually applied as CC1: FDM, CC2: TDM, CC3: FDM It may be applied, or may be applied collectively such as CC1, CC2, CC3: FDM.

Referring to FIG. 20, the base station receives mixed support information from the terminal (S2000). The mixed support information includes first support information and second support information. The mixed support information may further include an identifier or an application indicator. The base station calculates a cost function cost () for each scheme in order to determine which of the FDM scheme and the TDM scheme is disadvantageous to interference coordination (S2005). Variables of the cost function include in-device coexistence interference and loading of frequency bands. For example, in the case of the FDM scheme, the interference is small but the cost function will be large due to the large load of the frequency band. The opposite is true for the TDM scheme. A large cost function means that the interference coordination method is relatively disadvantageous. On the contrary, the small value of the cost function means that the interference coordination method is relatively advantageous.

Variables of the cost function may include a frequency band pass filter (BPF) characteristic, a UE capability such as a switch characteristic, a WiFi communication characteristic, a Bluetooth communication characteristic, and a GPS communication characteristic. . The frequency bandpass filter characteristic is an example of an indicator indicating a situation in which it is difficult to implement an FDM scheme because performance of a specific frequency band decreases depending on a terminal. In addition, the switch is an example of an indicator indicating a difficult situation to implement a TDM scheme.

The base station compares the cost function cost _FDM (), cost _TDM () according to each method (S2010). If 'cost _FDM ()> cost _TDM ()', the base station performs interference coordination based on the TDM scheme (S2015). If 'cost _FDM () <cost _TDM ()', the base station performs interference coordination based on the FDM scheme (S2020). The base station transmits the response information including the corresponding scheme information to the terminal (S2025).

Referring to FIG. 21, the terminal 2100 and the base station 2150 exchange information on in-device coexistence interference. The information about in-device coexistence interference includes mixed support information transmitted by the terminal 2100 and response information transmitted by the base station 2150.

The terminal 2100 includes an interference coordination request triggering unit 2105, a mixed support information generating unit 2110, a mixed support information transmitting unit 2115, and a response information receiving unit 2120.

When the in-device coexistence interference occurs, the interference coordination request triggering unit 2105 triggers the interference coordination request for the in-device coexistence interference. In-device coexistence interference may occur in the following cases: For example, suppose that the terminal 2100 transmits a signal y through another RF such as WiFi while receiving the signal x from the base station 2150 through the LTE RF. At this time, when the SINR of the signal y is greater than a certain threshold and acts as an interference to the signal x, in-device coexistence interference occurs. Here, the SINR is taken as an example of interference, but the present invention is not limited thereto, and RSRP or RSRQ may be used as the reference.

When the interference coordination request is triggered, the mixed support information generation unit 2110 generates mixed support information. The mixed support information includes first support information required for FDM based interference coordination and second support information required for TDM based interference coordination. The second assistance information may be called a TDM pattern.

The mixed support information generation unit 2110 may include the measurement result performed by the terminal in the mixed support information, and for the measurement samples excluding the measurement sample affected by the in-device coexistence interference in the measurement result. The method may further include at least one of a filtered first result, or a second result including in-device coexistence interference, and a difference value between the first result and the second result.

The mixed support information generating unit 2110 identifies an application indicator indicating a frequency band or a cell to which the second support information is applied to the mixed support information, or identifies the first support information and the second support information. At least one of support information identifiers may be further included. In this case, the identifier may be a MAC message or physical layer signaling.

The mixed support information generation unit 2110 may include an available band indicator indicating an available frequency band for the first assistance information or an unusable band indicator indicating an unavailable frequency band, wherein the available band The indicator and the unusable frequency band indicator indicate a frequency band corresponding to any serving cell composed of at least one component carrier (CC), and further, the FDM scheme-based device in the first assistance information. An avoiding indicator may be included indicating that avoiding coexistence interference is required.

The mixed support information generation unit 2110 may include information on the strength of in-device coexistence interference with respect to a frequency band corresponding to an arbitrary serving cell composed of at least one CC. have.

The mixed support information generation unit 2110 may include information on a time interval that is not available or usable by the first network system or the second network system due to the interference in the second support information. The information about the section is indicated in the form of a bitmap indicating that the section is an interference section corresponding to one subframe, or the period of time, the length of the time section, and the increase of the time section defined in consideration of the scheduling section for the terminal. It may be indicated in the form including at least one of the information and the discontinuous reception interval (DRX) length.

The mixed support information transmitter 2115 transmits the mixed support information to the base station 2150.

The base station 2150 includes a mixed support information receiver 2155, an interference coordination performer 2160, a response information generator 2165, and a response information transmitter 2170.

The mixed support information receiver 2155 receives the mixed support information from the terminal 2100.

The interference coordination performing unit 2160 may regard the mixed assistance information as an interference coordination request from the terminal 2100, and perform an assessment procedure for the request. The evaluation procedure may be performed separately for each frequency band (or cell) in which interference occurs. Alternatively, it may be performed collectively for the entire frequency band (or cell) in which interference occurs.

The interference coordination performing unit 2160 first evaluates which interference coordination method is suitable. As an example, the interference coordination performing unit 2160 may evaluate based on the priority. That is, the applicability of the first interference coordination scheme is first evaluated, and then the applicability of the second interference coordination scheme is evaluated. For example, the interference coordination performing unit 2160 may first evaluate whether the FDM scheme may be applied to the interference coordination, and may evaluate whether the TDM scheme may be applied when the FDM scheme is not applicable. Alternatively, on the contrary, the applicability of the TDM scheme may be evaluated first, followed by the applicability of the FDM scheme.

As another example, the interference coordination performing unit 2160 may evaluate the FDM scheme and the TDM scheme simultaneously using a cost function. That is, the base station evaluates the applicability of the FDM scheme and the applicability of the TDM scheme simultaneously or in parallel.

The interference coordination performing unit 2160 selects an interference coordination method determined to be suitable by the evaluation, and performs interference coordination based on the selected interference coordination method and supporting information corresponding thereto. The interference coordination performing unit 2160 may apply the same interference coordination scheme or different interference coordination schemes uniformly to each band where interference occurs. Meanwhile, the interference coordination performing unit 2160 applies the same TDM scheme uniformly to each band, but may apply different TDM patterns.

On the other hand, the interference coordination performing unit 2160 may not perform the interference coordination if both interference coordination methods are evaluated as inappropriate. In this case, the interference coordination performing unit 2160 may induce generation of response information indicating no operation or rejecting interference coordination.

The response information generator 2165 indicates that the interference is adjusted based on one of the methods selected by the evaluation according to the determination of the interference coordination performing unit 2160, or the FDM method and If neither of the TDM schemes is suitable, response information indicating that the interference is rejected is generated.

The response information indicating the acceptance of the interference coordination request may have a different form depending on whether the method selected in the evaluation procedure is an FDM or TDM method. For example, when the FDM scheme is selected, the response information indicating that the interference coordination request is accepted may include a cell reconfiguration message in the cell reconfiguration procedure, a handover command message in the handover procedure, and a frequency offset of a band in which the interference occurs. It may be a frequency shift indicator indicating to shift by as much as possible, or a frequency shaping indicator indicating to shape a portion of the band where interference occurs.

As another example, when the TDM scheme is selected, the response information indicating that the interference coordination request is accepted may be a DRX reconfiguration message, a DRX command message, or an ACK in the DRX procedure. On the other hand, the response information indicating the rejection of interference coordination may be NACK.

The response information transmitter 2170 transmits the response information to the terminal 2100. In this case, the response information transmitter 2170 may transmit the response information through an RRC message, a MAC message, or physical layer signaling.

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

Claims

In the method of interference coordination by the terminal in a wireless communication system,

Triggering requesting the base station to adjust for interference caused by transmission in the first frequency band of the first network system occurring at the terminal to reception in the second frequency band of the second network system occurring at the terminal. Performing;

First assistance information supporting the base station to adjust the interference in the frequency domain based on a frequency division multiplexing (FDM) scheme and supporting the base station to adjust the interference in the time domain based on a time division multiplexing (TDM) scheme Transmitting the mixed support information including the second support information to the base station; And

And receiving response information from the base station to accept or reject the adjustment of interference in response to the mixed support information.
The method of claim 1, wherein the mixed support information,

It includes a measurement result performed by the terminal,

The measurement result may include a first result filtered through measurement samples excluding measurement samples affected by in-device coexistence interference, or a second result including in-device coexistence interference, the first result and the second result. And at least one of the difference values of the results.
The method of claim 1, wherein the mixed support information,

And at least one of an application indicator indicating a frequency band or a cell to which the second assistance information is applied, or an assistance information identifier for identifying the first assistance information and the second assistance information. Interference coordination method characterized in that.
The method of claim 1, wherein the first support information,

A usable band indicator indicating an usable frequency band or an unusable band indicator indicating an unavailable frequency band, wherein the usable band indicator and the unavailable frequency band indicator comprise at least one component carrier; : Indicates a frequency band corresponding to any serving cell consisting of CC),

The first assistance information includes an avoiding indicator for indicating that the avoidance of the in-device coexistence interference based on the FDM scheme.
The method of claim 1, wherein the first support information,

And information on the strength of in-device coexistence interference on a frequency band corresponding to any serving cell consisting of at least one component carrier (CC).
The method of claim 1, wherein the second support information,

Includes information about a time period in which the first network system or the second network system is unavailable or usable due to the interference,

The information about the time period is indicated in the form of a bitmap indicating an interference period corresponding to one subframe, or a period of time period determined in consideration of a scheduling period for the terminal, the length of the time period, and the time period And at least one of increment information and a discontinuous reception interval (DRX) length of the interference coordination method.
The method of claim 1, wherein the triggering is performed.

The signal to noise interference ratio (SINR) of the transmission in the first frequency band is greater than or equal to a threshold;

And in-device coexistence interference is detected using RSRP (Reference Signal Received Power) or RSRQ (Reference Signal Received Quality) in the first frequency band.
In a terminal for performing interference coordination in a wireless communication system,

Performing triggering to request the base station to adjust the interference caused by transmission in the first frequency band of the first network system occurring at the terminal to reception in the second frequency band of the second network system occurring at the terminal. Interference coordination request triggering unit;

Mixed support for generating mixed support information including first support information for supporting the interference to be adjusted in the frequency domain based on the FDM scheme and second support information for supporting the interference to be adjusted in the time domain based on the TDM scheme An information generator;

A mixed support information transmitter for transmitting the mixed support information; And

And a response information receiver for receiving response information from the base station to accept or reject adjustment of the interference in response to the mixed support information.
The method of claim 8, wherein the mixed support information generation unit

The mixed support information includes a measurement result performed by the terminal,

The measurement result is a first result filtered through measurement samples excluding measurement samples affected by in-device coexistence interference, or a second result including in-device coexistence interference, the first result and the second result. And at least one of the difference values of the results.
The method of claim 8, wherein the mixed support information generation unit

An application indicator indicating the frequency band or cell to which the mixed support information applies, or a support information identifier for identifying the first support information and the second support information; And at least one of the terminal.
The method of claim 8, wherein the mixed support information generation unit

The first assistance information includes an available band indicator indicating an available frequency band or an unavailable band indicator indicating an unavailable frequency band, wherein the available band indicator and the unavailable frequency band indicator are at least Indicates a frequency band corresponding to an arbitrary serving cell composed of one component carrier (CC),

And the first assistance information includes an avoiding indicator indicating that the avoidance of in-device coexistence interference based on the FDM scheme is required.
The method of claim 8, wherein the mixed support information generation unit

And wherein the first assistance information includes information on the strength of in-device coexistence interference with respect to a frequency band corresponding to an arbitrary serving cell composed of at least one CC.
The method of claim 8, wherein the mixed support information generation unit

The second assistance information includes information about a time interval that is unavailable or usable by the first network system or the second network system due to the interference,

The information about the time period is indicated in the form of a bitmap indicating that the interference period corresponds to one subframe, or a period of time period defined in consideration of a scheduling period for the terminal, the length of the time period, the time And at least one of increment information of the interval and a length of a discontinuous reception interval (DRX).
The method of claim 8, wherein the interference coordination request triggering unit,

The signal to noise interference ratio (SINR) of the transmission in the first frequency band is greater than or equal to a threshold;

And triggering when in-device co-existence interference is detected using RSRP (Reference Signal Received Power) or RSRQ (Reference Signal Received Quality) in the first frequency band.
In the method of interference coordination by a base station in a wireless communication system,

Receiving mixed support information from the terminal to support interference in the frequency domain based on the FDM scheme or in the time domain based on the TDM scheme;

Evaluating one of the FDM scheme and the TDM scheme that is more suitable for coordinating the interference;

Response information indicating that the interference is adjusted based on any one method selected by the evaluation, or rejecting the adjustment of the interference if neither the FDM method nor the TDM method is suitable by the evaluation; Including the step of transmitting to the terminal,

The interference is caused by transmission in a first frequency band of a first network system occurring at the terminal for reception in a second frequency band of a second network system occurring at the terminal. Way.
The method of claim 15,

The evaluating step,

And evaluating the FDM scheme in preference to the TDM scheme.
The method of claim 15,

The evaluating step,

And comparing the first cost function by the FDM scheme with the second cost function by the TDM scheme to evaluate a more suitable scheme.
The method of claim 15,

The response information includes a cell reconfiguration message in a cell reconfiguration procedure, a handover command message in a handover procedure, a frequency shift indicator indicating to shift the band where the interference occurs, by a predetermined frequency offset, and a band where the interference occurs. And at least one of the frequency shaping indicators for instructing to shape a portion of the signal.
The method of claim 15,

And wherein the response information includes at least one of a DRX reconfiguration message, a DRX command message, and an acknowledgment (ACK) in a discontinuous reception (DRX) procedure.
A base station performing interference coordination in a wireless communication system,

A mixed support information receiver configured to receive mixed support information from the terminal to support interference in a frequency domain based on an FDM scheme or a time domain based on a TDM scheme;

An interference coordination performing unit that evaluates a method more suitable for coordinating the interference among the FDM scheme and the TDM scheme, and performs coordination of the interference based on any one scheme selected by the evaluation; And

Response information indicating that the interference is adjusted based on any one method selected by the evaluation, or rejecting the interference if the FDM method and the TDM method are not suitable by the evaluation; Including a response information transmitting unit for transmitting to the terminal,

And wherein the interference is caused by transmission in a first frequency band of a first network system occurring at the terminal for reception in a second frequency band of a second network system occurring at the terminal.