KR102003070B1 - Apparatus and method for transmitting control information in wireless communication system - Google Patents

Abstract

 The present disclosure provides a method and apparatus for transmitting control information in a wireless communication system. The method includes detecting an IDC interference and transmitting an IDC indication message to a base station if there is at least one frequency affected by the IDC interference, wherein the IDC indication message includes a frequency configured with a frequency affected by the IDC interference And the frequency list is configured to include an IDC interference direction indicating which direction the detected IDC interference affects.

Description

[0001] APPARATUS AND METHOD FOR TRANSMITTING CONTROL INFORMATION IN WIRELESS COMMUNICATION SYSTEM [0002]

The present invention relates to a wireless communication system, and more particularly, to an apparatus and method for transmitting control information in a wireless communication system.

Wireless communication systems typically 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 latest 3GPP (Long Term Evolution) or IEEE 802.16m (3GPP) continues to extend 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 multi-component carrier system has emerged in which a carrier having a bandwidth and a center frequency is defined and data can be transmitted and / or received over a plurality of carriers in a wide band. By using one or more carriers, it is possible to support narrowband and broadband at the same time. For example, if one carrier corresponds to a bandwidth of 5 MHz, it can support a maximum bandwidth of 20 MHz by using four carriers.

Today's ubiquitous access networks allow users to connect to different networks in different geographical areas and maintain connectivity anywhere. In a conventional manner in which one terminal performs communication with one network system, the user carries different devices supporting each network system. However, in recent years, as the functions of a single terminal have become more sophisticated and complex, it has become possible to simultaneously perform communication with a plurality of network systems even with a single terminal, and convenience of users is increasing.

However, if one terminal simultaneously communicates on a plurality of network system bands, in-device coexistence interference (IDC) may occur. Coexistence interference in a device refers to interference when transmission in one frequency band in the same terminal causes interference in reception in another frequency band. For example, in-device coexistence interference may occur between a Bluetooth system band and an 802.16 system band when one terminal simultaneously supports a bluetooth system and an 802.16 system. Coexistence interference in a device may occur mainly when the spacing of the frequency band boundaries of a heterogeneous network system is not sufficiently wide.

If an IDC occurs, the terminal transmits IDC support information to the base station so as to perform the related control operation. At this time, activation of IDC supporting information transmission can be determined to be caused by operation inside the terminal. If IDC supporting information is transmitted too often, waste of resources may occur.

An object of the present invention is to provide an apparatus and method for transmitting control information in consideration of the occurrence of coexistence interference in a device.

It is another object of the present invention to provide an apparatus and method for selectively transmitting control information related to coexistence interference in a device.

Another aspect of the present invention is to provide an apparatus and method for transmitting information on IDC interference direction among control information related to coexistence interference in an apparatus.

It is another object of the present invention to provide an apparatus and a method for transmitting information indicating a state of occurrence of coexistence interference in a device.

According to an aspect of the present invention, there is provided a method of transmitting control information by a terminal in a wireless communication system, the method comprising: detecting IDC interference; and transmitting, if at least one frequency affected by the IDC interference is present, Wherein the IDC indication message includes a frequency list configured with a frequency affected by the IDC interference, and the frequency list includes an IDC interference direction indicating a direction in which the detected IDC interference is affected .

According to another aspect of the present invention, in a wireless communication system, a terminal for transmitting control information includes an IDC sensing unit for sensing IDC interference, and an IDC indication message to the base station when at least one frequency affected by the IDC interference exists The transmitting unit and the IDC indication message including a frequency list configured by a frequency affected by the IDC interference, and the frequency list includes an IDC interference direction indicating a direction in which the detected IDC interference affects And a control unit.

According to another aspect of the present invention, a method for transmitting control information by a base station in a wireless communication system includes receiving an IDC indication message from a terminal that detects an IDC interference and determining an IDC resolution method based on the IDC indication message Wherein the IDC indication message includes a frequency list configured with a frequency affected by the IDC interference, and the frequency list includes an IDC interference direction indicating a direction in which the detected IDC interference is affected .

According to another aspect of the present invention, a base station for transmitting control information in a wireless communication system includes a receiver for receiving an IDC indication message from a terminal that detects an IDC interference, and an IDC resolving method for determining an IDC resolution method based on the IDC indication message Wherein the IDC indication message includes a frequency list configured with a frequency affected by the IDC interference, and the frequency list includes an IDC interference direction indicating a direction in which the detected IDC interference is affected .

According to the present invention, IDC can be solved more efficiently by transmitting information indicating in which direction the IDC interference is affecting in the support information about intra-device coexistence interference.

1 shows a wireless communication system to which an embodiment of the present invention is applied.
Fig. 2 is an explanatory diagram for explaining coexistence interference in a device applied to the present invention. Fig.
3 shows an example of intra-device coexistence interference from an ISM transmitter to an LTE receiver applied to the present invention.
4 is an example in which the ISM band and the LTE band are divided on the frequency band.
5 is an explanatory diagram showing an example of mitigating coexistence interference in an apparatus using the FDM scheme according to the present invention.
6 is an explanatory view showing another example of mitigating coexistence interference in a device using the FDM scheme according to the present invention.
FIGS. 7 and 8 are explanatory diagrams showing an example of mitigating coexistence interference in a device using a power control method according to the present invention.
FIG. 9 is an explanatory diagram showing an example of mitigating coexistence interference in a device using the TDM scheme applied to the present invention.
10 shows the transmission / reception timings of the LTE band and the ISM band on the time axis in which the coexistence interference in the apparatus is controlled according to the TDM scheme.
11 is a view showing another example of mitigating coexistence interference in a device using the TDM scheme according to the present invention.
12 is a view showing another example of mitigating coexistence interference in a device using the TDM scheme applied to the present invention.
13 is a diagram showing another example of mitigating coexistence interference in a device using the TDM scheme applied to the present invention.
14 and 15 show an example of a DRX operation applied to the present invention.
FIG. 16 shows bitmap pattern information, which is TDM pattern information determined based on HARQ applied to the present invention.
17 is a view for explaining a case where a terminal receives an interference signal in a device, which is applied to the present invention.
18 is a diagram showing an IDC procedure according to the present invention.
19 shows an example of an IDC interference direction according to the present invention.
20 is a flowchart showing operations of a terminal according to an exemplary embodiment of the present invention.
21 is a flowchart illustrating an operation of a base station according to an exemplary embodiment of the present invention.
22 is a block diagram illustrating an apparatus according to an example of the present invention.
FIG. 23 shows a situation where a specific area of the LTE DL is affected by the interference caused by the envelope envelope of the UL transmission when the LTE UL and the ISM UL are simultaneously transmitted.

Hereinafter, some embodiments will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the 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. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

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

1, a wireless communication system is widely deployed to provide various communication services such as voice, packet data, etc., and includes a user equipment (UE) 10, an evolved NodeB (eNB) 20, (Wireless LAN Access Point) 30, and a 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 a coverage of a plurality of networks, such as a cellular network, a wireless LAN, a broadcast network, a satellite system, 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 includes Long Term Evolution (LTE), WiFi, a Bluetooth (BT) transceiver, and a GPS receiver. Thus, the design of the terminal 10 is becoming more complex in order to integrate more and more transceivers in one same terminal 10 while maintaining good performance. This increases the likelihood that In-Device Coexistence interference (IDC interference) will 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 the downlink, the transmitter may be part of the base station 20 and the receiver may be part of the terminal 10. Also, in the 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. A CDMA (Code Division Multiple Access), a TDMA (Time Division Multiple Access), an FDMA (Frequency Division Multiple Access), an OFDMA (Orthogonal Frequency Division Multiple Access), an SC- -TDMA, and OFDM-CDMA.

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

Referring to FIG. 2, the terminal 10 includes an LTE RF 11, a GPS RF 12, and a Bluetooth / WiFi RF 13. Transmission / reception antennas 14, 15 and 16 are connected to each RF (Radio Frequency). That is, various kinds of RFs are closely mounted in one device platform. Here, the transmission power of one RF may be much larger than the reception power level of another RF receiver. At this time, if the frequency spacing between RFs is not sufficient and the filtering technique is not supported, any RF transmit signal may cause significant interference to other RF receivers in the device. For example, "A" in FIG. 2 is an example of a path where a transmission signal of the LTE RF 11 causes intra-device coexistence interference with the GPS RF 12 and the Bluetooth / WiFi RF 23, Is an example of a path through which a transmitted signal of the Bluetooth / WiFi RF 23 causes intra-device coexistence interference with the LTE RF 21.

3 is an example showing coexistence interference in a device from an ISM (Industrial Scientific and Medical) transmitter to an LTE receiver applied to the present invention. The ISM transmitter is a transmitter that transmits in the ISB band, which is a freely available band without permission in the industrial science 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 transmitted signal of the ISM transmitter. In this case, coexistence interference in the equipment may occur. In particular, when receiving a signal through the LTE receiver in the frequency bands F1 to F3, F2 and F3 indicate that the ISM transmitter is in a situation where unacceptable interference occurs in the LTE receiver. Here, F1 to F3 may be frequency bands belonging to one band. However, F1 exists in the band outside the region where the coexistence interference is severe, and F2 and F3 belong to the region where the IDC affects the most. That is, the degree of the coexistence interference problem may be different between the frequency bands depending on the characteristics of the band filter even in one band.

4 is an example in which the ISM band and the LTE band are divided on the frequency band.

Referring to FIG. 4, band 40, band 7, and band 38 are LTE bands. Band 40 occupies 2300 to 2400 MHz band in TDD mode, uplink in band FDD mode occupies 2500 to 2570 MHz band, and downlink occupies 2620 to 2690 MHz. And the band 38 occupies the 2570 to 2620 MHz band in the 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 where coexistence interference occurs in the device is shown in Table 1 below.

Interference band Type 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 co-existence interference in the apparatus with receiver b. In band 40, the ISM transmitter causes intra-device coexistence interference to the downlink TDD receiver (LTE DL TDD Rx) of the LTE band. A filtering scheme can mitigate co-existence interference in the device to some extent, but is not sufficient. In addition to the filtering method, the FDM (Frequency Division Multiplex) method or the like can more effectively mitigate the coexistence interference in the device.

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

Referring to FIG. 5, the LTE band may be moved in the direction of the arrows (e.g., to the left in the frequency band axis) such that the LTE band does not overlap the ISM band. This results in a handover of the terminal from the ISM band. However, this requires a way for legacy measurement or new signaling to precisely trigger a mobility procedure or a radio link failure (RLF) procedure. Alternatively, there is a method of avoiding the problematic parts in the LTE band through filtering or resource allocation techniques. Alternatively, if LTE carrier aggregation is used, overlap interference may be avoided through a procedure of reconfiguring the set of carriers to be used.

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

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

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

Referring to FIG. 7, the UE can reduce the transmission power of the LTE signal to a certain level, thereby avoiding intra-device coexistence interference, and improve the reception quality of the ISM band. Referring to FIG. 8, It is possible to improve the reception quality of the LTE signal by avoiding coexistence interference in the apparatus.

FIG. 9 is an explanatory diagram showing an example of mitigating coexistence interference in a device by using a TDM (Time Division Multiplexing) scheme 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, coexistence interference in the device can be avoided. For example, if a signal in the ISM band is transmitted at t ₀ , the LTE signal is received at t ₀ .

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

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

11 is a view showing another example of mitigating coexistence interference in a device using the TDM scheme according to the present invention.

Referring to FIG. 11, a TDM scheme based on Discontinuous Reception (DRX) is used in which a predetermined pattern periodicity period is divided into a scheduled period and an unscheduled period period The coexistence interference in the device can be avoided by dividing. The UE avoids the LTE transmission in the non-scheduled period and avoids the mutual interference between the LTE and the ISM, and the LTE primary transmission such as Random Access or Hybrid Automatic Repeat reQuest (HARQ) Even within a given period of time. The MS avoids the ISM transmission within the scheduled period and allows the LTE transmission to avoid mutual interference between the LTE and the ISM. As in the case of the non-scheduled period, the main transmission of the ISM band, such as a beacon or Wi-Fi, may be allowed within the scheduled period. LTE transmission may be prevented to protect the primary transmission of the ISM band. In addition, special signaling may be added to protect the primary transmission of an ISM band, such as a beacon. For example, beacon signaling period and subframe offset information may be added. At this time, the subframe offset number and the system frame number can 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 is composed of 10 subframes, the UE can know the exact frame position in the corresponding system through the subframe offset number and the system frame number.

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

Referring to FIG. 12, an autonomous denial scheme to which a TDM scheme is applied is arbitrarily denied for LTE transmission in order to protect ISM reception when intra-device coexistence interference occurs in the UE. In FIG. 12, a check mark indicates that transmission or reception is approved, and an X mark indicates that transmission or reception is rejected. Even if the LTE UL transmission is granted from the base station, the terminal may refuse to grant the LTE UL transmission in order to protect the ISM reception. Similarly, an ISM transmission may be rejected to protect LTE reception. ISM transmission power can be lowered to a certain level to improve reception quality in LTE.

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

Referring to FIG. 13, as a partial autonomously denial scheme using a TDM scheme, when an ISM transmission is denied due to the occurrence of difficulties in LTE reception of a UE due to occurrence of IDC interference, a PDCCH (Physical Downlink The control channel is partially rejected based on the ISM transmission of the subframe.

When the UE receives the LTE PDCCH region, the UE in principle rejects the ISM transmission. However, if the downlink resource allocation does not exist in the subframe region indicated by the PDCCH based on the PDCCH region, it is not necessary to reject the ISM transmission for the corresponding subframe region, and ISM transmission is allowed. Here, the PDCCH region refers to a region including a resource region including control information, such as resource allocation or grant information, and an area required to decode the control information. In case of LTE, it means the sum of the number of OFDM symbols used for PDCCH transmission and the size of the area required for decoding the PDCCH in the UE, transmitted by the Physical Control Format Indicator Channel (PCFICH). At this time, the size of the area required for decoding the PDCCH may vary depending on the implementation of the UE, but it may not be larger than one subframe.

Referring to FIG. 13, each of the PDCCH regions 1300, 1310, 1320, 1330, 1340, 1350, 1360, and 1370 may deny ISM transmission. The UE also receives a non-PDCCH field (non-PDCCH) 1305, 1315, 1325, 1335, 1345, 1355 , 1365, and 1375). There is a downlink resource allocation in the non-PDCCH regions 1315, 1335, 1345, and 1355, but there is no downlink resource allocation in the non-PDCCH regions 1305, 1325, 1365, Therefore, it partially rejects the ISM transmission only for some non-PDCCH areas 1315, 1335, 1345, and 1355. ISM transmission is allowed for the other non-PDCCH areas 1305, 1325, 1365, 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 is a period during which a DRX operation is performed. For example, a long DRX cycle is applied in a range between 10 subframes and 2560 subframes. Another example is a short DRX cycle applied in the range of 2 subframes to 640 subframes. In this case, the DRX operation is applied only while the DRX short cycle timer (drxShortCycleTimer) is operated, and the same long DRX cycle is applied in the range outside the DRX short cycle timer. Here, the DRX short cycle timer is one basic DRX cycle. That is, if the length of the short DRX cycle is 10, it becomes the time of "10 * drxShortCycleTimer". The range of the length of the short DRX period is 1 to 16.

The active time 1405 indicates the total time when the UE awakes to receive the PDCCH. The activity time is a time during which the terminal's on-duration timer 1415 is operating or a DRX inactivity timer 1420, a DRX retransmission timer 1425, And a time at which a timer such as a resolution timer (mac-ContentionResolutionTimer, 1430) is operating.

The non-active time 1410 refers to a time other than the activity 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, the DRX timers are signaled or operated on a PDCCH-subframe basis. Here, the PDCCH-subframe means a subframe including a PDCCH. For example, in the TDD configuration, DL subframes and DwPTS (subframes) correspond to PDCCH-subframes. A subframe that is configured for a relay node (RN) but is not suspend corresponds to a PDCCH-subframe.

Referring to FIG. 15, while the duration timer 1515 of the DRX cycle 1500 is active, the DRX command MAC control element 1550 is activated for 150 seconds, Upon receipt of the command MAC CE 1550, the duration timer 1515 is stopped and becomes the non-active time 1510. The range of the duration timer 1515 may be psf1 to psf200, i.e., 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 when data decoding in the HARQ procedure can not be successfully performed within the HARQ RTT (Round Trip Time). When the PDCCH including the grant message is received for the corresponding process, the DRX retransmission timer is stopped.

FIG. 16 shows bitmap pattern information, which is TDM pattern information determined based on HARQ applied to the present invention.

Referring to FIG. 16, it is preferable that a retransmission signal is protected when data is transmitted based on HARQ. Here, protection means that retransmission must be done. If retransmissions are not made to mitigate or avoid coexistence in the TDM scheme, the performance of the system will be significantly degraded. Based on this point, the transmission pattern is determined by considering the retransmission period. For DL transmission, 1 and 6 subframes are reserved in advance and 2 and 7 subframes are reserved for UL transmission. This is called a scheduled subframe. Unscheduled subframes for mitigating coexistence interference in a device are subframes that should not be used for transmission for protection of the ISM band.

This pattern can be given as a bitmap pattern. That is, the number of server frames represented by one bit may be one or more. The period of the pattern is the product of the total length of the bitmap and the number of subframes per bit, and each bit can have a value of 0 if the subframe indicated by the bit is a scheduled subframe or a value of 1 if it is a non-scheduled subframe . On the other hand, if the subframe indicated by each bit is a scheduled subframe, it may be set to 1, and if it is a non-scheduled subframe, a value of 0 may be set.

For example, let it be assumed that the period is 20, the pattern representing the subframe is "1001001000 ", the unscheduled subframe has the value 0, and the number of subframes represented by one bit is two. Since the first, fourth, and seventh bits in the pattern indicating the subframe have a value of 1, it can be seen that the subframes 0, 1, 6, 7, 12, and 13 are the scheduled subframes in each period.

17 is a view for explaining a case where a terminal receives an interference signal in a device, which is applied to the present invention. It is classified into seven cases based on the frequency and strength of interference.

Referring to FIG. 17, if the seven cases are classified into four patterns based on the frequency of interference, case 1 and case 2 are continuous, case 3 and case 4 are bursty, 5 and Case 6 are sparse, and Case 7 is a pattern of none.

Case 1, Case 3 and Case 5 are very strong, Case 2, Case 4 and Case 6 are weak enough, Case 7 is a pattern of none.

For example, Case 1 and Case 3 may be cases where the terminal is judged to be an on-going IDC (hereinafter referred to as IDC in progress). These cases are cases where interference is continuous or frequent, and the strength is very strong.

In the meantime, a state in which coexistence interference occurs in the device while it is not in progress during the IDC process, and coexistence interference in the device is likely to be changed to an ongoing interference state is defined as "presence of coexistence interference in a potential device" Quot;).

For example, the terminal can determine that Case 2, Case 4, Case 5, and Case 6 in FIG. 17 are capable of generating a potential IDC. As another example, the terminal can determine that a potential IDC can occur only in case 5, which has a very strong strength. It is not impossible to perform handover or RRC setting / reset in a potential IDC capable frequency band, and the terminal may perform measurement.

As another example, Case 1, Case 2, Case 3, Case 4 may be the case where it is determined that the IDC of the terminal is in progress. These cases are cases where the interference is continuous or frequent. And the strength of the interference is not considered.

On the other hand, the cases 5 and 6 can be defined as "in the presence of coexistence interference in the device"

In another example, whether the IDC is in progress may include interference between the IDC and the cell (e.g., interference of co-channel serving and non-serving cells of the same channel, adjacent channel interference ), Etc.) and thermal noise can all be considered. That is, IDC, inter-cell interference, adjacent channel interference, and thermal noise may be defined as being in the process of IDC in the case where the combined effect is strong or frequent. For example, if only IDC is considered in FIG. 17, IDC may be in progress if inter-cell interference, adjacent channel interference, thermal noise, or the like are considerably large even though the case corresponds to case 2 or case 4.

Now, a method and apparatus for transmitting control information for controlling intra-device coexistence interference according to the present invention will be described. The actions to reduce, avoid or remove interference are collectively referred to as interference control, interference coordination, or interference solution.

18 illustrates the IDC procedure according to the present invention.

Referring to FIG. 18, the terminal detects intra-device coexistence interference (IDC) (S1800).

The terminal transmits an IDC indication to the base station (S1805). At this time, IDC assistance information, which is useful for application of the FDM and TDM solution, is transmitted to the base station. The IDC support information may be delivered by an IDC indication message (InDeviceCoExIndication message).

The following table shows an example of an IDC indication message. However, the IDC indication message does not need to include all the fields in the following table, but may include only some fields.

Here, a detailed description of each field is shown in the following table

Here, 'IdcCarrierFreqList', one of the information elements, is used to indicate the ARFCN (or EARFCN) value and is used to indicate the interference direction of one or more EUTRA carrier frequencies.

An example of IdcCarrierFreqList is shown in the following table.

IdcCarrierFreqList-r11 :: = SEQUENCE {SIZE {1..maxFreq-r11}} OF UnusableFreq-r11 UnusableFreq-r11 :: = SEQUENCE {   carrierFreq ARFCN-ValueEUTRA   interferedRadio-r11 ENUMERATED {eutra, other, both, free} OPTIONAL }

In Table 4, 'interferedRadio-r11' is an information element indicating in which direction the IDC interference is affecting in the UE. That is, it indicates which radio of the terminal is receiving interference. The direction may be referred to as an IDC interference direction.

If 'IdcCarrierFreqList' corresponding to the unusable frequency list does not exist in the signaling, the current state may mean that there is no IDC. That is, the IDC problem does not occur within the frequency set by the measurement configuration. This state can be referred to as 'IDC over'.

On the other hand, one or more unusable frequencies may occur, and for each unusable frequency the direction of interference may be defined as above.

19 shows an example of an IDC interference direction.

Referring to FIG. 19, solid lines A and B are illustrations of the intensity of a self-received signal in each communication system in the form of a filter in a simplified form.

In the case of the dotted lines (C, D), the intensity of the IDC interference reception signaling in each communication system is briefly exemplified as a filter type. That is, in the case of the dotted line, when the transmission in the other system is received as IDC interference, the intensity of the signal is briefly illustrated in the form of a filter.

Here, in the case of the interval 1910, since the signal strength of the receiver of each communication system is relatively larger than the reception strength of the transmission signal of the other system, it can be an IDC interference free region. Corresponds to "free" in the signaling in Table 4 above.

In the case of the signaling in the period 1920, since A and C are considerably larger than B and D, the influence of the IDC interference can cause problems in reception of ISM or GNSS. Corresponds to "other" in the signaling in Table 4 above. This means that there is a problem receiving the (other) system (eg ISM or GNSS) other than LTE.

In case of 1930 section, since C and D are relatively larger than A and B, reception problems may occur in both LTE, ISM and GNSS. Corresponds to "both" in the signaling of Table 4 above.

In the case of 1940 interval, since B and D are considerably larger than A and C, the influence of IDC interference can cause a problem in reception of LTE side. Corresponds to "eutra" in the signaling in Table 4 above.

As shown in the figure, frequency regions 1920, 1940, and 1930 in which IDC interference occurs may have different directionality of IDC interference. Therefore, the IDC indication message includes direction information (or direction indicator) of different IDC interference for each unusable frequency domain.

FIG. 19 is an example of a situation in which the LTE UL affects the IDC interference to the ISM DL, and the ISM UL affects the IDC interference to the LTE DL. However, depending on the UE implementation, when LTE UL and ISM UL are simultaneously transmitted, a specific area of the LTE DL may be affected by an envelope of an UL transmission waveform.

FIG. 23 shows a situation where a specific area of the LTE DL is affected by the interference caused by the envelope envelope of the UL transmission when the LTE UL and the ISM UL are simultaneously transmitted.

Referring to FIG. 23, the interference direction of the IDC between the LTE UL and the ISM DL may be 'other'. However, for LTE DL, IDC's interference direction will be 'LTE'.

Thus, the direction of interference includes direction indicators of different IDC interference for the unusable frequency domain.

On the other hand, following step S1805, the base station takes an IDC solution (S1810).

If the base station determines the FDM resolution method, steps S1815 to S1830 are performed between the terminal and the base station.

The base station transmits an RRC connection reconfiguration message (Connection Reconfig Msg) together with a measurement configuration (Measurement Configuration) to the terminal (S1815). Selected frequencies that the base station considers as target frequencies for inter-frequency handover may be transmitted together.

Following step S1815, the terminal transmits an RRC connection reset completion to the base station (S1820).

The process of steps S1815 to S1820 may be omitted if the measurement setting is already appropriate for the target frequency before the IDC instruction operation is generated.

Then, the UE performs measurement for the advised frequencies (S1825).

Then, the terminal performs a measurement report to the base station (S1830). At this time, an inter-frequency handover procedure may follow.

If the base station determines the TDM resolution method, S1840 to S1850 are performed between the terminal and the base station.

The base station transmits an RRC connection reconfiguration message to the terminal (S1840). At this time, TDM resolution related parameters (e.g., DRX parameters if DRX is a mechanism) may be transmitted together.

The MS transmits a Connection reconfig complete message to the BS (S1845).

The terminal and the base station operate in an agreed TDM pattern (S1850). For example, a DRX operation can be performed with the agreed DRX pattern.

20 is a flowchart showing operations of a terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 20, the terminal detects IDC interference (S2000).

The UE confirms the detected direction of the IDC interference, and includes the direction information in the frequency list affected by the IDC interference, and transmits it to the base station through the IDC indication message including the frequency list (S2005 ).

That is, the IDC indication message may include an IDC affected frequency list (e.g. IdcCarrierFreqList in Table 2 above). In addition, the IDC affected frequency list may include frequency information affected by the IDC and IDC direction information regarding the direction in which the IDC interference affects the frequency.

As another example, the absence of an IDC affected frequency list, which is an unavailable frequency list, may imply implicitly the absence of an IDC. That is, it may mean that the IDC problem does not occur within the frequency set by the measurement setting.

Meanwhile, the unusable frequency may be one frequency or a plurality of frequencies, and in the case of a plurality of frequencies, an interference direction may be defined for each unusable frequency.

Meanwhile, following step S2005, the terminal receives the IDC resolution method from the base station (S2010).

If the IDC solution is an FDM solution in step S2010, the UE receives an RRC connection reset message from the base station together with the measurement setup (S2015), and receives the selected frequency considered as a target frequency for inter-frequency handover . Then, the MS transmits the RRC connection reset completion to the BS (S2020).

Then, the UE performs measurement for the proposed frequency (S2025).

Then, the terminal performs measurement report to the base station (S2030). At this time, an inter-frequency handover procedure may follow.

If the IDC solution is a TDM solution in step S2010, the terminal receives an RRC connection re-establishment message from the base station (S2040). TDM resolution related parameters (e.g., DRX parameters) may be received together.

The MS transmits a connection reset completion message to the BS (S2045).

The terminal operates in a TDM pattern agreed with the base station (S2050). For example, a DRX operation can be performed with the agreed DRX pattern.

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

Referring to FIG. 21, from a terminal that has detected an IDC interference, a base station transmits an IDC affected frequency list including frequency information affected by the IDC and IDC direction information as to which direction the IDC interference affects in the frequency , IdcCarrierFreList in Table 2) (S2100).

Meanwhile, the base station determines the IDC resolution method based on the IDC-affected frequency information and the IDC direction information (S2105).

If the base station determines the FDM resolution in step S2105, the base station transmits an RRC connection re-establishment message to the mobile station together with the measurement setup (S2110), and the base station receives the RRC connection re-establishment completion from the mobile station (S2115). The RRC connection reestablishment message may be transmitted with a frequency considered as a target frequency for inter-frequency handover. The processes of S2110 to S2115 may be omitted if the measurement setting is already appropriate for the target frequency before the IDC instruction is generated.

The base station receives from the terminal a measurement report including a measurement result performed on the advised frequencies based on the measurement setting (S2120). At this time, an inter-frequency handover procedure may follow.

If the base station determines the TDM resolution method in step S2105, the base station transmits an RRC connection re-establishment message to the mobile station (S2125) and receives a connection re-establishment completion message from the mobile station (S2130). TDM resolution related parameters (e.g., DRX parameters) may be transmitted along with the RRC connection re-establishment message.

The base station operates in a TDM pattern agreed with the terminal (S2135). For example, a DRX operation can be performed with the agreed DRX pattern.

22 is a block diagram illustrating an apparatus according to an example of the present invention.

22, the terminal 2200 includes a receiving unit 2205, a transmitting unit 2210 or a control unit 2215. The control unit 2215 further includes an IDC sensing unit 2230 or a measuring unit 2235 can do.

The IDC detection unit 2230 detects IDC interference.

The IDC detection unit 2230 can confirm the direction of the detected IDC interference.

The control unit 2215 is configured to include the direction information of the IDC interference in the frequency list affected by the IDC interference.

The transmission unit 2210 transmits the IDC indication message including the frequency list affected by the IDC interference to the base station 2250.

The IDC indication message may include an IDC affected frequency list (e.g., IdcCarrierFreList in Table 2).

For example, the IDC affected frequency list may include IDC-affected frequency information and IDC direction information as to which direction the IDC interference affects in the frequency.

As another example, an IDC that is not an available frequency list. If there is no affected frequency list, it may implicitly mean a state without an IDC. That is, it may mean that the IDC problem does not occur within the frequency set by the measurement setting.

Meanwhile, the unusable frequency may be one frequency or a plurality of frequencies may be generated, and the interference direction may be defined for each unusable frequency.

Receiving unit 2205 receives the IDC resolution determined by base station 2250 from base station 2250.

If the IDC resolution is an FDM resolution, the receiver 2205 receives an RRC connection re-establishment message from the base station 2250 with measurement settings.

Receiving unit 2205 may receive a selected frequency considered as a target frequency for inter-frequency handover with the RRC connection re-establishment message.

The transmitting unit 2210 transmits the RRC connection reset completion to the base station 2250.

The measuring unit 2235 performs the advised frequencies based on the measurement setting.

Transmitter 2210 performs a measurement report to base station 2250. At this time, an inter-frequency handover procedure may follow.

If the IDC resolution is a TDM solution, the receiver 2205 receives an RRC connection reset message from the base station 2250 and may receive TDM resolution related parameters (e.g., DRX parameters) together.

The transmission unit 2210 transmits a connection reset completion message to the base station 2250.

Terminal 2200 operates in an agreed TDM pattern. For example, a DRX operation can be performed with the agreed DRX pattern.

The base station 2250 includes a receiving unit 2255, a transmitting unit 2260 or a control unit 2265. The controlling unit 2265 may further include an IDC resolution determining unit 2270. [

The receiving unit 2255 receives from the terminal 2200 that has detected the IDC interference, the frequency information affected by the IDC and the IDC affected frequency list including the IDC direction information as to which direction the IDC interference affects in the frequency , IdcCarrierFreList in Table 2).

Meanwhile, the IDC resolution determination unit 2270 determines an IDC resolution method based on the IDC-affected frequency information and the IDC direction information.

If the IDC resolution determination unit 2270 determines the FDM resolution method, the transmission unit 2260 transmits an RRC connection re-establishment message to the UE 2200 together with the measurement setup, and the target for the inter- The frequency considered as a frequency may be transmitted together.

The receiving unit 2255 receives the RRC connection reset completion from the terminal 2200.

The receiving unit 2255 receives from the terminal 2200 a measurement report including the measurement results performed on the advised frequencies based on the measurement setting. At this time, an inter-frequency handover procedure may follow.

If the IDC resolution determination unit 2270 determines the TDM resolution method, the transmitter 2260 transmits an RRC connection re-establishment message to the UE 2200 and transmits the RRC connection re- (E.g., DRX parameters).

The receiving unit 2255 receives a connection reset completion message from the terminal 2200.

The base station 2250 operates in a TDM pattern agreed with the terminal 2200. For example, a DRX operation can be performed with the agreed DRX pattern.

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 scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (20)

A method for transmitting control information by a terminal in a wireless communication system,
Detecting InDevice Coexistence interference; And
And transmitting an IDC indication message to the base station if at least one frequency affected by the IDC interference is present,
The IDC indication message includes a frequency list configured by a frequency affected by the IDC interference. The frequency list includes an IDC interference direction indicating a direction in which the detected IDC interference affects each frequency of the frequency list, ≪ / RTI > 2. The method of claim 1, wherein for each frequency of the frequency list,
Eutra refers to interference to LTE related frequency bands in other frequency bands, other refers to interference to other frequency bands in LTE related frequency bands, and one of both to refer to interfering while receiving LTE frequency bands ≪ / RTI > 3. The method of claim 2,
And receiving an IDC resolution for resolving the IDC interference from the base station after transmitting the IDC indication message to the base station. 4. The method of claim 3, wherein if the IDC resolution is an FDM resolution,
Further comprising receiving an RRC connection re-establishment message from the base station together with a measurement setting,
Wherein the RRC connection re-establishment message comprises a selected frequency considered as a target frequency for inter-frequency handover. 4. The method of claim 3, wherein if the IDC resolution is a TDM resolution,
Receiving an RRC connection re-establishment message from the base station together with a DRX parameter; And
And operating in an agreed TDM pattern based on the DRX parameter. A terminal for transmitting control information in a wireless communication system,
An IDC sensing unit for sensing InDevice Coexistence interference;
A transmitter for transmitting an IDC indication message to a base station if there is at least one frequency affected by the IDC interference; And
Wherein the IDC indication message includes a frequency list configured by a frequency affected by the IDC interference, the frequency list including an IDC interference direction indicating a direction in which the detected IDC interference affects each frequency of the frequency list, And a control unit configured to include the control unit. 7. The apparatus of claim 6,
For each frequency of the frequency list, an eutra that refers to the interference of the IDC interference direction to an LTE related frequency band in another frequency band, another that refers to interference to another frequency band in an LTE related frequency band, Wherein the at least one of the at least two antennas comprises at least one of both of receiving interference and providing interference. 8. The method of claim 7,
Further comprising: a receiver for receiving an IDC solution for resolving the IDC interference from the base station. 9. The method of claim 8, wherein if the IDC resolution is an FDM resolution,
The receiving unit receives an RRC connection re-establishment message from the base station together with a measurement setting,
Wherein the RRC connection re-establishment message comprises a selected frequency considered as a target frequency for inter-frequency handover. 9. The method of claim 8, wherein if the IDC resolution is a TDM resolution,
Wherein the receiver receives an RRC connection re-establishment message from the base station together with a DRX parameter,
And operates in a TDM pattern agreed based on the DRX parameters. A method for transmitting control information by a base station in a wireless communication system,
Receiving an IDC indication message from a terminal that detects InDevice Coexistence interference; And
Determining an IDC resolution based on the IDC indication message,
The IDC indication message includes a frequency list configured by a frequency affected by the IDC interference. The frequency list includes an IDC interference direction indicating a direction in which the detected IDC interference affects each frequency of the frequency list, ≪ / RTI > 12. The method of claim 11, wherein for each frequency of the frequency list,
Eutra refers to interference to LTE related frequency bands in other frequency bands, other refers to interference to other frequency bands in LTE related frequency bands, and one of both to refer to interfering while receiving LTE frequency bands ≪ / RTI > 13. The method of claim 12,
If the IDC resolution is an FDM resolution,
Further comprising transmitting an RRC connection re-establishment message to the terminal together with a measurement setting,
Wherein the RRC connection re-establishment message comprises a selected frequency considered as a target frequency for inter-frequency handover. 13. The method of claim 12, wherein if the IDC resolution is a TDM resolution,
Transmitting an RRC connection re-establishment message to the terminal together with a DRX parameter; And
And operating in an agreed TDM pattern based on the DRX parameter. A base station for transmitting control information in a wireless communication system,
A receiver for receiving an IDC indication message from a terminal that detects InDevice Coexistence interference; And
And an IDC resolution determination unit for determining an IDC resolution method based on the IDC indication message,
The IDC indication message includes a frequency list configured by a frequency affected by the IDC interference. The frequency list includes an IDC interference direction indicating a direction in which the detected IDC interference affects each frequency of the frequency list, The base station comprising: 16. The method of claim 15, wherein for each frequency of the frequency list,
Eutra refers to interference to LTE related frequency bands in other frequency bands, other refers to interference to other frequency bands in LTE related frequency bands, and one of both to refer to interfering while receiving LTE frequency bands . 17. The method of claim 16, wherein if the IDC resolution is an FDM resolution,
And a transmission unit for transmitting an RRC connection re-establishment message to the terminal together with a measurement setting,
Wherein the RRC connection re-establishment message comprises a selected frequency considered as a target frequency for inter-frequency handover. 17. The method of claim 16, wherein if the IDC resolution is a TDM resolution,
And a transmitter for transmitting an RRC connection re-establishment message to the terminal together with a DRX parameter,
And operates in a TDM pattern that is agreed based on the DRX parameters. 3. The method of claim 2, wherein the IDC indication message is further configured to include a recommended DRX cycle length, a DRX start offset, and a DRX activation time. 13. The method of claim 12, wherein the IDC indication message is further configured to include a recommended DRX cycle length, a DRX start offset, and a DRX activation time.

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