KR20140036912A - Apparatus and method for transmitting control information in wireless communication system - Google Patents

Abstract

The present invention provides a method and a device for transmitting control information in a wireless communication system. The device according to the present invention receives in-device coexistence interference (IDC) configuration information, configures a frequency in which an uplink IDC triggering is performed based on the IDC configuration information and transmits IDC support information including information related to the uplink IDC triggering to the base station. Specifically, the IDC configuration information further includes an uplink frequency list for IDC triggering and a downlink frequency for IDC triggering is configured based on a measurement object which is configured by a measurement configuration included in an RRC connection reconfiguration message. [Reference numerals] (AA) Terminal; (BB) Base station; (S1800) Capability information of the terminal; (S1805) Reconfiguring the RRC connection (IDC configuration information); (S1810) IDC triggering; (S1815) IDC support information; (S1820) IDO solution operation

Description

Apparatus and method for transmitting control information in a wireless communication system {APPARATUS AND METHOD FOR TRANSMITTING CONTROL INFORMATION IN WIRELESS COMMUNICATION SYSTEM}

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

Accordingly, a multiple component carrier system has emerged, which defines a carrier having one bandwidth and a center frequency and enables transmission and / or reception of data over a wide band through a plurality of carriers. 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 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 terminal simultaneously communicates on multiple network system bands, In-Device Coexistence interference (IDC) 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 802.16 system band when one terminal simultaneously supports a Bluetooth system and an 802.16 system. In-device co-existence interference can occur mainly when the spacing between frequency band boundaries of heterogeneous network systems is not wide enough.

When the IDC occurs, the terminal transmits the IDC assistance information to the base station so as to perform a control operation related thereto. In this case, the triggering for the transmission of the IDC assistant information may be determined to be generated by an operation inside the terminal. It is required to set a frequency band in which the triggering is performed.

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

Another object of the present invention is to provide an apparatus and method for triggering control information regarding coexistence interference in a device.

Another object of the present invention is to provide an apparatus and method for setting a frequency band for triggering control information about coexistence interference in a device.

According to an aspect of the present invention, a method for transmitting control information by a terminal in a wireless communication system is a base station to a Radio Resource Control (RRC) connection reconfiguration message including the in-device coexistence interference (IDC) configuration information Receiving from; Setting a frequency at which uplink IDC triggering is performed based on the IDC configuration information; And transmitting IDC assistance information including information related to the uplink IDC triggering to the base station.

According to another aspect of the present invention, a method for transmitting control information by a base station in a wireless communication system, the terminal receives a Radio Resource Control (RRC) connection reconfiguration message including in-device coexistence interference (IDC) configuration information Transmitting to; And receiving IDC assistance information including information related to uplink IDC triggering set based on the IDC configuration information from the terminal.

According to another aspect of the present invention, a terminal transmitting control information in a wireless communication system receives a radio resource control (RRC) connection reconfiguration message including an in-device coexistence interference (IDC) configuration information from a base station A receiving unit; A controller configured to set a frequency at which uplink IDC triggering is performed based on the IDC configuration information; And a transmitter for transmitting IDC assistance information including information related to the uplink IDC triggering to the base station, wherein the IDC configuration information further includes an uplink frequency list for IDC triggering, and a downlink for IDC triggering. The frequency is set based on the measurement object set by the measurement setup included in the RRC connection reset message.

According to another aspect of the present invention, a base station transmitting control information in a wireless communication system transmits a Radio Resource Control (RRC) connection reconfiguration message including in-device coexistence interference (IDC) configuration information to a terminal. A transmission unit; It includes a receiver for receiving from the terminal the IDC support information including information associated with the uplink IDC triggering set based on the IDC configuration information, the IDC configuration information further comprises an uplink frequency list for IDC triggering, The downlink frequency for IDC triggering is set based on the measurement object set by the measurement configuration included in the RRC connection reconfiguration message.

According to the present invention, since IDC can be triggered for both uplink and downlink in the support information on coexistence interference in the device and can transmit support information, IDC interference can be more efficiently performed. Can be controlled.

1 illustrates a wireless communication system to which an embodiment of the present invention is applied.
2 is an explanatory diagram for explaining in-device coexistence interference applied to the present invention.
3 shows an example of in-device coexistence interference from an ISM transmitter to an LTE receiver according to the present invention.
4 shows an example in which an ISM band and an LTE band are divided on a frequency band.
5 is an explanatory diagram illustrating an example of mitigating in-device coexistence interference using an FDM scheme according to the present invention.
6 is an explanatory diagram showing another example of mitigating in-device coexistence interference using an FDM scheme according to the present invention.
7 and 8 are explanatory diagrams showing an example of mitigating in-device coexistence interference using a power control scheme according to the present invention.
9 is an explanatory diagram showing an example of mitigating in-device coexistence interference by using a TDM scheme applied to the present invention.
10 shows transmission / reception timings on the time axis of the LTE band and the ISM band which controlled in-device coexistence interference according to the TDM scheme.
11 illustrates another example of mitigating in-device coexistence interference by using a TDM scheme according to the present invention.
12 is a diagram illustrating another example of mitigating in-device coexistence interference using a TDM scheme applied to the present invention.
FIG. 13 is a diagram illustrating another example of mitigating in-device coexistence interference by using a TDM scheme applied to the present invention.
14 and 15 show an example of a DRX operation applied to the present invention.
FIG. 16 shows bitmap pattern information as TDM pattern information determined based on HARQ applied to the present invention.
FIG. 17 is a diagram illustrating a case where a terminal receives an interference signal in a device according to the present invention.
18 is a flowchart illustrating that control information for controlling in-device coexistence interference is transmitted between a terminal and a base station.
19 is a flowchart illustrating an operation of a terminal transmitting control information for controlling in-device coexistence interference.
20 is a flowchart illustrating an operation of a base station transmitting control information for controlling in-device coexistence interference.
21 is a block diagram illustrating an apparatus for transmitting control information for controlling in-device coexistence interference.

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 symbols as 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. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected or connected to that other component, but there is another component between each component. It will be understood that may be "connected", "coupled" or "connected".

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

FIG. 13 is a partial autonomously denial scheme applied to the present invention, in which a physical downlink control channel (PDCCH) is rejected when ISM transmission is rejected in case of difficulty in LTE reception of a terminal due to occurrence of IDC interference. Based on), it partially rejects ISM transmission of a subframe.

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

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

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

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

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

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

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

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

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

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

FIG. 16 shows bitmap pattern information as 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, protecting means that retransmission must be made. If retransmission is not performed to mitigate or avoid in-device coexistence interference by TDM, the performance of the system will be significantly reduced. Based on this, the transmission pattern is determined in consideration of the retransmission period. Subframes 1 and 6 are reserved in advance for DL transmission, and subframes 2 and 7 are reserved for UL transmission. This is called a scheduled subframe. Unscheduled subframes for mitigation of coexistence interference in a device are subframes that should not be used for transmission to protect the ISM band.

Such a pattern may 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 may have a value of 0 if the subframe indicated by the bit is a scheduled subframe and a value of 1 if an unscheduled subframe. . Conversely, if the subframe indicated by each bit is a scheduled subframe, it may have a value of 1 and a non-scheduled subframe.

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

FIG. 17 is a diagram illustrating a case where a terminal receives an interference signal in a device according to the present invention. It is classified into seven cases based on the frequency of interference and the strength or power.

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

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

On-going IDC interference (hereinafter referred to as ongoing IDC) of the terminal should be used as an implementation guideline used in the terminal. On the serving frequency, the ongoing IDC means interference given from the aggressor radio to the victim radio. The interference is caused by a data transmission or reception process that is expected to be active within a few 100 ms or a currently active data transmission or reception. As for the non-serving frequency, when the UE performs handover in the LTE system at the corresponding frequency, interference that is expected to be an aggregate or a big team is an IDC interference in progress. The definition of "activation" for the ongoing IDC to be defined does not necessarily affect all subframes / slots.

For example, if it is determined that the IDC is in progress, it may be Case 1 and Case 3. The cases are at least a case where the interference is continuous or frequent and is very strong.

On the other hand, a condition that does not correspond to an ongoing IDC but in-device coexistence interference has occurred and is likely to change into in-device coexistence interference is defined as "potential in-device coexistence interference present" (hereinafter referred to as potential IDC) Is called).

For example, the terminal may determine that case 2, case 4, case 5, and case 6 of FIG. 17 are potential IDC generation. As another example, the terminal may determine that only case 5 having a strong strength is capable of generating potential IDC. Handover, RRC setting / resetting, etc. are not impossible in the potential IDC possible frequency band, and the UE may perform measurement.

As another example, the case of determining the ongoing IDC of the terminal may be a case 1, 2, 3 and case 4. The cases are cases where interference is continuous or frequent. This is the case where the strength of the interference is not taken into account.

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

As another example, whether the IDC is in progress may include IDC and inter-cell interference (eg, interference of co-channel serving and non-serving cells in the same channel) and adjacent channel interference. ), Etc.) and thermal noise can be considered. In other words, the IDC, inter-cell interference, adjacent channel interference, and thermal noise may be defined as ongoing IDC for the case where the effects of the sum of all of the strong and frequent noises are strong. For example, in the case of considering only IDC in FIG. 17, the IDC may be in progress when the interference between cells, adjacent channel interference, thermal noise, etc. is considerably large even in case 2 or case 4.

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

Hereinafter, IDC for uplink refers to the influence of ISM RF on LTE uplink transmission, and IDC for downlink refers to IDC affecting ISM RF on LTE downlink reception.

If the frequency setting for the IDC triggering is limited in the measurement object set in the measurement setup step, the IDC triggering is limited to the IDC triggering for the downlink. Hereinafter, IDC triggering means that the terminal detects coexistence interference in the device and triggers transmission of IDC assistance information.

However, the IDC problem has a big impact on the UE as well as the IDC for the downlink. Therefore, triggering for IDC for uplink is also required, and it is also necessary to set uplink frequency band in which the IDC for uplink can be triggered in the terminal. The present invention proposes an uplink frequency band in which IDC for uplink can be triggered, and transmits performance information of a terminal that can be required to set uplink frequency band in which IDC for uplink can be triggered. Suggest.

18 is a flowchart illustrating that control information for controlling in-device coexistence interference is transmitted between a terminal and a base station.

Referring to FIG. 18, the terminal transmits UE capability information to the base station (S1800). The performance information of the terminal may be transmitted in an RRC message.

The performance information of the terminal may include information of a potential IDC generation frequency band.

Based on the information of the potential IDC possible frequency band, the base station may use the information for uplink frequency setting for IDC triggering. For example, the IDC triggering related setting may not be set for a frequency band that is determined not to cause an IDC problem because it is not a potential IDC generation frequency band.

As an example of the present invention, the performance information of the terminal may include a list composed of all EARFCN (EAR-FCN) values of the potential IDC generation frequency band.

As another example of the present invention, the performance information of the terminal may include an EARFCN value corresponding to a boundary value of a potential IDC generation frequency band within one operation band. That is, one EARFCN value may be referred to in one operating band.

For example, if "39000" is referred to in band 40 of the operating band by the performance information of the terminal, it is indicated that the potential IDC generation frequency range is configured by frequencies having an EARFCN value of 39000 to 39649. . This is because, as can be seen in FIG. 4, the current ISM band is located in a higher frequency band than the band 40, so the influence of IDC is likely to occur in the high frequency region in the band 40. For reference, the band 40 has an EARFCN value range of 38650 to 39649 in LTE.

As another example of the present invention, the performance information of the terminal may further include an indicator indicating the direction of the boundary value along with the EARFCN value corresponding to the boundary value of the potential IDC generation frequency band in one operating band. . The directionality of the threshold may be implicitly determined by the band position at which another wireless system (eg, ISM, GNSS) operates, but may be directly indicated through the indicator. For example, the indicator may indicate whether the boundary value is the upper bound or the lower bound. If the EARFCN value in the band 40 is to indicate the band of 39000 to 39649, the performance information of the terminal may include an indicator indicating a lower boundary in addition to the EARFCN value "39000".

Meanwhile, when the performance information of the terminal includes a plurality of EARFCN values or a plurality of directional indicators, potential IDC generation frequency bands in a plurality of operating bands may be indicated.

As another example of the present invention, the performance information of the terminal may include only a band number of a potential IDC generation frequency band. The entire frequency band indicated by the band number may be transmitted as an IDC capable frequency band, which is a method in which signaling overhead is reduced.

If the performance information of the terminal does not include information related to the potential IDC generation frequency band, the base station based on the information on whether the terminal has IDC avoidance capability, the base station needs IDC triggering in the network to which it belongs Or sets the downlink frequency band.

Following step S1800, the base station performs an RRC connection reconfiguration for the terminal (S1805). The RRC connection reset message may include measurement configuration related information. In addition, the RRC connection reconfiguration information may include IDC configuration information (IDC configuration). The IDC configuration information refers to configuration information related to triggering of IDC occurring in uplink reception or downlink transmission. Based on the measurement configuration information and the IDC configuration information, the base station sets a frequency band for uplink or downlink IDC triggering for the terminal.

According to an embodiment of the present invention (Embodiment 1), the IDC configuration information may include both uplink and downlink IDC triggering frequency lists. That is, when the base station configures IDC through the RRC connection reconfiguration process, the IDC triggered frequency is set without distinction of downlink and uplink. As an example, the frequency list may consist of a list of EARFCN values.

In this embodiment, since the base station directly configures all uplink / downlink IDC triggering frequency bands to the terminal, the terminal may perform IDC triggering in one or more frequency bands of the received frequency band. In this case, the frequency band set through the measurement object may be overlapped and transmitted.

In another embodiment of the present invention (Embodiment 2), the IDC configuration information may not include an additional uplink frequency band. Based on the measurement configuration included in the RRC connection reestablishment message, the UE is configured for uplink for IDC triggering on uplink frequencies associated with a measurement object and a SIB2-linked uplink frequency. Perform frequency setting. That is, the RRC resetting procedure does not set additional IDC, and sets uplink frequency for IDC triggering according to the measurement configuration. Here, SIB2-connected means that a cell attempting downlink access is connected by opening SIB2 broadcast to know uplink frequency information (especially when the cell attempting access is a main serving cell). That is, the SIB2-connected uplink frequency refers to a frequency of an uplink designated in a System Information Block 2 (SIB2) message transmitted through a corresponding downlink for one downlink.

When the measurement configuration is set for the terminal through the RRC connection reset, when the frequency of the uplink and the downlink is separated, such as an FDD band, frequency values indicated by the measurement objects set by the measurement configuration are downlink It is configured for IDC triggering and configured for uplink IDC triggering with SIB2-linking to respective measurement objects. If the carrier aggregation environment, the primary serving cell is accessed through the SIB2-connected frequency, and the remaining cells are transmitted with information on the SIB2 through dedicated RRC signaling received from the primary serving cell. That is, the uplink frequency for the main serving cell is set through the SIB2-connection, and the uplink frequency for the remaining cells is set through dedicated signaling (eg, RRC signaling).

On the other hand, in the case of the TDD band such as the band 40 in which the frequencies of the uplink and the downlink are not separated, the frequency indicated by the measurement objects set by the measurement configuration is used for uplink IDC triggering and downlink IDC triggering. Is set.

In another embodiment of the present invention (Embodiment 3), the IDC configuration information may include an uplink frequency list for IDC triggering. The downlink frequency for IDC triggering is limited based on the measurement object, but the uplink frequency for IDC triggering can be signaled separately. For example, the IDC configuration information may include a list consisting of EARFCN values of uplink frequencies for IDC triggering.

That is, apart from the measurement setting, the base station may additionally transmit an uplink frequency for IDC triggering on the FDD band (bands in which the downlink frequency band and the uplink frequency band are different). In the case of the TDD band, since the downlink frequency band and the uplink frequency band in the corresponding band are the same, no additional setting is necessary.

In another embodiment of the present invention (Embodiment 4), the IDC configuration information may include a list of uplink frequencies excluding uplink frequencies that are SIB2-connected through the measurement object. For example, the list of uplink frequencies may consist of EARFCN values of the uplink frequency.

That is, the IDC configuration information may include an uplink frequency that is SIB2-connected with the measurement object and an uplink frequency excluding the uplink frequency of the TDD band in the measurement object.

For example, suppose that the base station attempts to set uplink frequencies having EARFCN values of "2800", "2801", "2802", "39000", and "39001" as uplink frequencies for IDC triggering. In this case, the frequencies with the EARFCN values of "2800", "2801" and "2802" are the frequency of band 7 and the uplink frequency of the FDD band, and the frequencies with the EARFCN values of "39000" and "39001" are the frequency of band 40. Let it be the uplink frequency of the TDD band. At this time, by the measurement setting, the frequency with the EARFCN value of 20800 (this frequency is SIB2-connected to the frequency with the EARFCN value of 2800), the frequency with the EARFCN value of 20801 (this frequency is SIB2-connected with the frequency with the EARFCN value of 2801), And a frequency with an EARFCN value of 39000 is set.

At this time, the base station additionally sets the frequency of the EARFCN value 2802 and the frequency of the EARFCN value 39001 to the terminal in addition to the frequency included in the measurement configuration for uplink frequency setting for IDC triggering. Accordingly, the IDC configuration information transmitted to the terminal includes a frequency list with EARFCN values 2802 and 39001.

Subsequently to step S1805, the terminal performs IDC triggering (S1810). When the terminal detects coexistence interference in the device, the terminal performs IDC triggering to trigger transmission of IDC assistance information such as IDC indication.

The IDC triggering may be performed based on an IDC triggering condition set in the terminal. IDC triggering may be performed when a situation in which coexistence interference occurs in a terminal device causes severe performance degradation or when a serious performance degradation is expected to occur soon (for example, within several hundred ms). The frequency at which deterioration or severe degradation is expected to occur soon is called an unusable frequency or an IDC affected frequency.

 For example, IDC triggering may be performed based on whether the terminal is in progress of IDC according to a determination within the terminal. That is, the IDC triggering condition may be whether or not the IDC is in progress as described above with reference to FIG. 16, and the criterion may be based on a determination inside the terminal.

As another example, IDC triggering may be performed according to an internal implementation of the terminal as to whether or not the communication may be experienced by the IDC situation. In this case, the IDC triggering condition according to the internal determination of the UE may be set based on a test case, IDC interference strength and activity, a packet error rate, or a measurement result.

Following step S1810, the terminal transmits IDC assistance information to the base station (S1815).

In one embodiment according to the present invention, the IDC assistance information includes at least one of an affected frequency list, an interference direction per affected frequency, and a recommended TDM pattern. can do. The affected frequency list or the interference direction may be information for an FDM-based IDC solution, and the recommended TDM pattern may be information for a TDM-based IDC solution. In particular, the TDM pattern information may include information for DRX operation.

For example, the form of the list of the affected frequencies may be one of the following two embodiments.

First, the list of affected frequencies may be in the form of a measurement object ID list. By the measurement setting, one measurement object indicates a value of one EARFCN and is given one measurement object ID. Accordingly, the measurement object ID indicates one EARFCN value, and the affected list may be configured with the measurement object ID.

At this time, the list of the affected frequencies in the form of a measurement object ID list may be applied to the case of the second embodiment. In this case, the IDC directional indicator may determine whether the IDC problem is related to uplink or downlink.

Second, the list of affected frequencies may be a list consisting of EARFCN values. That is, the list of affected frequencies may be a list including the EARFCN value itself of the frequency band affected by IDC.

The list consisting of the EARFCN values of the IDC affected frequencies can be applied to all of the first to fourth embodiments.

Meanwhile, the IDC assistance information may include an IDC indication and may be transmitted through an RRC message. The IDC assistance information is also called IDC indication information. The IDC assistance information may be transmitted together with a measurement result measured by the terminal.

As another example, the IDC assistance information may be transmitted through an InDeviceCoexIndication message. The InDeviceCoexIndication message is a list of affected carrier freq, available measurement result, parameters required for TDM operation (e.g. DRX cycle length, DRX offset, DRX activity time). Or HARQ-based bitmap pattern). In particular, the IDC affected frequency list is used to indicate the EARFCN value and can be used to indicate the interference direction of one or more EUTRA carrier frequencies. As such, when indicating in which direction the IDC interference is affected inside the terminal, that is, when indicating which radio of the terminal is being interfered with. The direction may be referred to as an IDC interference direction.

Subsequently to step S1815, the base station determines an IDC solution and an IDC solution operation is performed between the terminal and the base station (S1820).

For example, when the base station determines the FDM solution, the base station transmits an RRC connection reset message to the terminal along with the measurement configuration, and the base station target frequencies for inter-frequency (inter-frequency) handover Selected frequencies to be considered as () may be transmitted together. Subsequently, the terminal transmits the RRC connection resetting completion to the base station. Subsequently, the terminal performs the measurement on the set frequency (eg, advised frequencies). Subsequently, the terminal performs a measurement report to the base station, where an inter-frequency handover procedure may follow.

As another example, when the base station determines the TDM solution method, the base station transmits an RRC connection reconfiguration message to the terminal, and at this time, TDM solution related parameters (eg, DRX parameter in the case of the DRX mechanism) may be transmitted together. Subsequently, the terminal transmits a connection reset completion message to the base station. Subsequently, the terminal and the base station operate in an agreed TDM pattern. For example, a DRX operation may be performed in an agreed DRX pattern.

19 is a flowchart illustrating an operation of a terminal transmitting control information for controlling in-device coexistence interference.

Referring to FIG. 19, the terminal transmits UE capability information to the base station (S1900). The performance information of the terminal may be included in an RRC message and transmitted. The performance information of the terminal may include information of a potential IDC generation frequency band.

As an example of the present invention, the performance information of the terminal may include a list composed of all EARFCN values of potential IDC possible frequency bands.

As another example of the present invention, the performance information of the terminal may include an EARFCN value corresponding to a boundary value of a potential IDC generation frequency band within one operating band. That is, one EARFCN value may be referred to in one operating band.

As another example of the present invention, the performance information of the terminal may further include an indicator indicating the direction of the boundary value along with the EARFCN value corresponding to the boundary value of the potential IDC generation frequency band in one operating band. . The directionality of the threshold may be implicitly determined by the band position at which another wireless system (eg, ISM, GNSS) operates, but may be directly indicated through the indicator. For example, the indicator may indicate whether the boundary value is the upper limit value or the lower limit value.

Meanwhile, when the performance information of the terminal includes a plurality of EARFCN values or a plurality of directional indicators, potential IDC generation frequency bands in a plurality of operating bands may be indicated.

As another example of the present invention, the performance information of the terminal may include only the band number of the potential IDC generation frequency band. The entire frequency band indicated by the band number may be transmitted as an IDC capable frequency band.

If the performance information of the terminal does not include information related to the potential IDC generation frequency band, the base station based on the information on whether the terminal has IDC avoidance capability, the base station needs IDC triggering in the network to which it belongs Or sets the downlink frequency band.

Following step S1900, the terminal receives an RRC connection reset from the base station (S1905). The RRC connection reset message may include measurement setting related information. In addition, the RRC connection reset information may include IDC configuration information.

In one embodiment of the present invention, the IDC configuration information may include both uplink and downlink IDC triggering frequency list. That is, when the base station configures IDC through the RRC connection reconfiguration process, the IDC triggered frequency is set without distinction of downlink and uplink. As an example, the frequency list may consist of a list of EARFCN values.

In this embodiment, since the base station directly configures all uplink / downlink IDC triggering frequency bands to the UE, the UE performs IDC triggering in one or more frequency bands of the received frequency bands.

In another embodiment of the present invention, the IDC configuration information may not include an additional uplink frequency band. Based on the measurement configuration included in the RRC connection reconfiguration message, the UE performs uplink frequency configuration for IDC triggering on uplink frequencies connected to the measurement object and SIB2-. That is, the RRC resetting procedure does not set additional IDC, and sets uplink frequency for IDC triggering according to the measurement configuration.

When the measurement configuration is set for the terminal through the RRC connection reset, when the frequency of the uplink and the downlink is separated, such as an FDD band, frequency values indicated by the measurement objects set by the measurement configuration are downlink It is configured for IDC triggering and configured for uplink IDC triggering with SIB2-linking to respective measurement objects. If the carrier aggregation environment is connected to the main serving cell through the SIB2-connected frequency, the remaining information is transmitted to the SIB2 through the dedicated RRC signaling received from the main serving cell. That is, the uplink frequency for the main serving cell is set through the SIB2-connection, and the uplink frequency for the remaining cells is set through dedicated signaling (eg, RRC signaling).

On the other hand, in the case of the TDD band such as the band 40 in which the frequencies of the uplink and the downlink are not separated, the frequency indicated by the measurement objects set by the measurement configuration is used for uplink IDC triggering and downlink IDC triggering. Is set.

According to another embodiment of the present invention, the IDC configuration information may include an uplink frequency list for IDC triggering. The downlink frequency for IDC triggering is limited based on the measurement object, but the uplink frequency for IDC triggering can be signaled separately. For example, the IDC configuration information may include a list consisting of EARFCN values of uplink frequencies for IDC triggering.

That is, apart from the measurement setting, the UE may additionally receive an uplink frequency for IDC triggering on an FDD band (a band different from a downlink frequency band and an uplink frequency band). In the case of the TDD band, since the downlink frequency band and the uplink frequency band in the corresponding band are the same, no additional setting is necessary.

According to another embodiment of the present invention, the IDC configuration information may include a list of uplink frequencies excluding uplink frequencies that are SIB2-connected through the measurement object. For example, the list of uplink frequencies may consist of EARFCN values of the uplink frequency.

That is, the IDC configuration information may include an uplink frequency that is SIB2-connected with the measurement object and an uplink frequency excluding the uplink frequency of the TDD band in the measurement object.

Following step S1905, the terminal performs IDC triggering (S1910). When the terminal detects in-device coexistence interference, the terminal performs IDC triggering to trigger transmission of IDC assistance information such as an IDC indication. The IDC triggering may be performed based on an IDC triggering condition set in the terminal.

For example, IDC triggering may be performed based on whether the terminal is in progress of IDC according to a determination within the terminal. That is, the IDC triggering condition may be whether or not the IDC is in progress as described above with reference to FIG. 16, and the criterion may be based on a determination inside the terminal.

As another example, IDC triggering may be performed according to an internal determination of the UE as to whether or not the communication may be experienced by the IDC situation. In this case, the IDC triggering condition according to the internal determination of the terminal may be set based on a test case, IDC interference strength and activity, PER, or a measurement result.

Following step S1910, the terminal transmits IDC assistance information to the base station (S1915).

For example, the IDC assistance information may include at least one of an affected frequency list, an interference direction of an affected frequency, and a recommended TDM pattern. The affected frequency list or the interference direction may be information for an FDM based IDC solution, and the recommended TDM pattern may be information for a TDM based IDC solution. In particular, the TDM pattern information may include information for DRX operation.

For example, the form of the list of the affected frequencies may be one of the following two embodiments.

First, the list of affected frequencies may be in the form of a list of measurement object IDs. In this case, when there is an uplink frequency that is not related to the measurement configuration, the list of the affected frequencies having the form of the measurement object ID list may be applied to the case of the second embodiment. In this case, the IDC directional indicator may determine whether the IDC problem is related to uplink or downlink.

Second, the list of affected frequencies may be a list consisting of EARFCN values. That is, the list of affected frequencies may be a list including the EARFCN value itself of the frequency band affected by IDC. The list consisting of the EARFCN values of the IDC affected frequencies can be applied to all of the first to fourth embodiments.

Meanwhile, the IDC assistance information may include an IDC indication and may be transmitted through an RRC message. The IDC assistance information may be transmitted together with the measurement result measured at the terminal.

As another example, the IDC assistance information may be transmitted through an InDeviceCoexIndication message. The InDeviceCoexIndication message includes a list of frequencies affected by IDC, usable measurement results, and parameters (eg, DRX cycle length, DRX offset, DRX activity time, or HARQ based bitmap pattern) required for TDM operation. It may include at least one.

Following step S1915, based on the IDC solution determined by the base station, the terminal performs an IDC solution with the base station (S1920).

For example, when the base station determines the FDM solution, the base station transmits an RRC connection reconfiguration message to the terminal along with the measurement configuration, and the selected frequency that the base station considers as a target frequency for inter-frequency handover may be transmitted together. . Subsequently, the terminal transmits the RRC connection resetting completion to the base station. Subsequently, the terminal performs the measurement on the set frequency. Subsequently, the terminal performs a measurement report to the base station, where an inter-frequency handover procedure may be followed.

As another example, when the base station determines the TDM solution method, the base station transmits an RRC connection reconfiguration message to the terminal, and at this time, TDM solution related parameters (eg, DRX parameter in the case of the DRX mechanism) may be transmitted together. Subsequently, the terminal transmits a connection reset completion message to the base station. Subsequently, the terminal and the base station operate in the agreed TDM pattern. For example, a DRX operation may be performed in an agreed DRX pattern.

20 is a flowchart illustrating an operation of a base station transmitting control information for controlling in-device coexistence interference.

Referring to FIG. 20, the base station receives performance information of the terminal (S2000). The performance information of the terminal may be transmitted in an RRC message. The performance information of the terminal may include information of a potential IDC generation frequency band.

As an example of the present invention, the performance information of the terminal may include a list composed of all EARFCN values of potential IDC possible frequency bands.

As another example of the present invention, the performance information of the terminal may include an EARFCN value corresponding to a boundary value of a potential IDC generation frequency band within one operating band. That is, one EARFCN value may be referred to in one operating band.

As another example of the present invention, the performance information of the terminal may further include an indicator indicating the direction of the boundary value along with the EARFCN value corresponding to the boundary value of the potential IDC generation frequency band in one operating band. . The directionality of the threshold may be implicitly determined by the band position at which another wireless system (eg, ISM, GNSS) operates, but may be directly indicated through the indicator. For example, the indicator may indicate whether the boundary value is the upper limit value or the lower limit value.

Meanwhile, when the performance information of the terminal includes a plurality of EARFCN values or a plurality of directional indicators, potential IDC generation frequency bands in a plurality of operating bands may be indicated.

As another example of the present invention, the performance information of the terminal may include only the band number of the potential IDC generation frequency band. The entire frequency band indicated by the band number may be transmitted as an IDC capable frequency band.

If the performance information of the terminal does not include information related to the potential IDC generation frequency band, the base station based on the information on whether the terminal has IDC avoidance capability, the base station needs IDC triggering in the network to which it belongs Or sets the downlink frequency band.

Following step S2000, the base station performs RRC connection reconfiguration for the terminal (S2005). The RRC connection reset message may include measurement setting related information. In addition, the RRC connection reset information may include IDC configuration information. In one embodiment of the present invention, the IDC configuration information may include both uplink and downlink IDC triggering frequency list. That is, when the base station configures IDC through the RRC connection reconfiguration process, the IDC triggered frequency is set without distinction of downlink and uplink. As an example, the frequency list may consist of a list of EARFCN values.

In this embodiment, since the base station directly sets uplink / downlink IDC triggering frequency bands to the terminal, the terminal performs IDC triggering in one or more frequency bands of the received frequency band.

In another embodiment of the present invention, the IDC configuration information may not include an additional uplink frequency band. Based on the measurement configuration included in the RRC connection reconfiguration message, the UE performs uplink frequency configuration for IDC triggering on uplink frequencies connected to the measurement object and SIB2-. That is, the RRC resetting procedure does not set additional IDC, and sets uplink frequency for IDC triggering according to the measurement configuration.

When the measurement configuration is set for the terminal through the RRC connection reset, when the frequency of the uplink and the downlink is separated, such as an FDD band, frequency values indicated by the measurement objects set by the measurement configuration are downlink It is configured for IDC triggering and configured for uplink IDC triggering with SIB2-linking to respective measurement objects. If the carrier aggregation environment is connected to the main serving cell through the SIB2-connected frequency, the remaining information is transmitted to the SIB2 through the dedicated RRC signaling received from the main serving cell. That is, the uplink frequency for the main serving cell is set through the SIB2-connection, and the uplink frequency for the remaining cells is set through dedicated signaling (eg, RRC signaling).

On the other hand, in the case of the TDD band such as the band 40 in which the frequencies of the uplink and the downlink are not separated, the frequency indicated by the measurement objects set by the measurement configuration is used for uplink IDC triggering and downlink IDC triggering. Is set.

According to another embodiment of the present invention, the IDC configuration information may include an uplink frequency list for IDC triggering. The downlink frequency for IDC triggering is limited based on the measurement object, but the uplink frequency for IDC triggering can be signaled separately. For example, the IDC configuration information may include a list consisting of EARFCN values of uplink frequencies for IDC triggering.

That is, apart from the measurement configuration, the base station may additionally transmit an uplink frequency for IDC triggering on the FDD band.

According to another embodiment of the present invention, the IDC configuration information may include a list of uplink frequencies excluding uplink frequencies that are SIB2-connected through the measurement object. For example, the list of uplink frequencies may consist of EARFCN values of the uplink frequency.

That is, the IDC configuration information may include an uplink frequency that is SIB2-connected with the measurement object and an uplink frequency excluding the uplink frequency of the TDD band in the measurement object.

In step S2005, the base station receives IDC assistance information from the terminal that has performed IDC triggering (S2010).

According to an embodiment of the present invention, the IDC assistance information may include at least one of an affected frequency list, an interference direction of an affected frequency, and a recommended TDM pattern. The affected frequency list or the interference direction may be information for an FDM based IDC solution, and the recommended TDM pattern may be information for a TDM based IDC solution. In particular, the TDM pattern information may include information for DRX operation.

For example, the form of the list of the affected frequencies may be one of the following two embodiments.

First, the list of affected frequencies may be in the form of a list of measurement object IDs. In this case, when there is an uplink frequency that is not related to the measurement configuration, the list of the affected frequencies having the form of the measurement object ID list may be applied to the case of the second embodiment. In this case, it may be determined whether the IDC is uplink or downlink through the IDC directional indicator.

Second, the list of affected frequencies may be a list consisting of EARFCN values. That is, the list of affected frequencies may be a list including the EARFCN value itself of the frequency band affected by IDC. The list consisting of the EARFCN values of the IDC affected frequencies can be applied to all of the first to fourth embodiments.

Meanwhile, the IDC assistance information may include an IDC indication and may be transmitted through an RRC message. The IDC assistance information may be transmitted together with the measurement result measured at the terminal.

As another example, the IDC assistance information may be transmitted through an InDeviceCoexIndication message. The InDeviceCoexIndication message includes at least one of a list of frequencies affected by IDC, available measurement results, and parameters required for TDM operation (eg, DRX cycle length, DRX offset, DRX activity time, or TDM pattern). can do.

Following step S2010, the base station determines an IDC solution and performs an IDC solution between the terminal and the base station (S2015).

For example, when the base station determines the FDM solution, the base station transmits an RRC connection reconfiguration message to the terminal along with the measurement configuration, and the selected frequency that the base station considers as a target frequency for inter-frequency handover may be transmitted together. . Subsequently, the terminal transmits the RRC connection resetting completion to the base station. Subsequently, the terminal performs the measurement on the set frequency. Subsequently, the terminal performs a measurement report to the base station, where an inter-frequency handover procedure may be followed.

As another example, when the base station determines the TDM solution method, the base station transmits an RRC connection reconfiguration message to the terminal, and at this time, TDM solution related parameters (eg, DRX parameter in the case of the DRX mechanism) may be transmitted together. Subsequently, the terminal transmits a connection reset completion message to the base station. Subsequently, the terminal and the base station operate in the agreed TDM pattern. For example, a DRX operation may be performed in an agreed DRX pattern.

21 is a block diagram illustrating an apparatus for transmitting control information for controlling in-device coexistence interference.

Referring to FIG. 21, the terminal 2100 may include at least one of a transmitter 2115, a receiver 2105, and a controller 2110. The controller 2110 may further include a triggering unit 2113.

The transmitter 2115 transmits performance information of the terminal 2100 to the base station 2150. The performance information of the terminal 2100 may be included in an RRC message and transmitted. The performance information of the terminal 2100 may include information of a potential IDC generation frequency band.

As an example of the present invention, the performance information of the terminal 2100 may include a list of all EARFCN values of potential IDC generation frequency bands.

As another example of the present invention, the performance information of the terminal 2100 may include an EARFCN value corresponding to a boundary value of a potential IDC generation frequency band within one operating band. That is, one EARFCN value may be referred to in one operating band.

As another example of the present invention, the performance information of the terminal 2100 further includes an indicator indicating the direction of the boundary value along with the EARFCN value corresponding to the boundary value of the potential IDC generation frequency band within one operating band. can do. The directionality of the threshold may be implicitly determined by the band position at which another wireless system (eg, ISM, GNSS) operates, but may be directly indicated through the indicator.

When the performance information of the terminal 2100 includes a plurality of EARFCN values or a plurality of directional indicators, potential IDC generation frequency bands in a plurality of operating bands may be indicated based on this.

As another example of the present invention, the performance information of the terminal 2100 may include only a band number of a potential IDC generation frequency band. The entire frequency band indicated by the band number may be transmitted as an IDC capable frequency band.

If the performance information of the terminal 2100 does not include the information related to the potential IDC generation frequency band, the base station 2150 is based on the information on whether the terminal 2100 has IDC avoidance capability. Set uplink or downlink frequency band that requires IDC triggering in the network.

The receiver 2105 receives an RRC connection reset from the base station 2150. The RRC connection reset message may include measurement setting related information. In addition, the RRC connection reset information may include IDC configuration information.

In one embodiment of the present invention, the IDC configuration information may include both uplink and downlink IDC triggering frequency list. That is, when IDC is set through the RRC connection reconfiguration process by the base station 2150, the controller 2110 sets the IDC triggered frequency without downlink / uplink distinction. As an example, the frequency list may consist of a list of EARFCN values. In this embodiment, since the base station 2150 sets all the uplink / downlink IDC triggering frequency bands to the terminal 2100, the triggering unit 2113 triggers IDC triggering in one or more frequency bands of the received frequency bands. Do this.

In another embodiment of the present invention, the IDC configuration information may not include an additional uplink frequency band. Based on the measurement setting included in the RRC connection reconfiguration message, the controller 2110 performs uplink frequency setting for IDC triggering on uplink frequencies connected to the measurement object and SIB2-. That is, the controller 2110 sets an uplink frequency for IDC triggering according to the measurement setting without setting an additional RRC resetting procedure.

When the control unit 2110 performs measurement setting through the RRC connection resetting, when frequencies of uplink and downlink are separated, such as an FDD band, frequency values indicated by the measurement objects set by the measurement setting are It is configured for downlink IDC triggering, and configured for uplink IDC triggering with SIB2-linking to respective measurement objects. If the carrier aggregation environment is connected to the main serving cell through the SIB2-connected frequency, the remaining information is transmitted to the SIB2 through the dedicated RRC signaling received from the main serving cell. That is, the uplink frequency for the main serving cell is set through the SIB2-connection, and the uplink frequency for the remaining cells is set through dedicated signaling (eg, RRC signaling).

On the other hand, in the case of the TDD band such as the band 40 in which the frequencies of the uplink and the downlink are not separated, the frequency indicated by the measurement objects set by the measurement configuration is used for uplink IDC triggering and downlink IDC triggering. Is set.

According to another embodiment of the present invention, the IDC configuration information may include an uplink frequency list for IDC triggering. The downlink frequency for IDC triggering is limited based on the measurement object, but the uplink frequency for IDC triggering can be signaled separately. For example, the IDC configuration information may include a list consisting of EARFCN values of uplink frequencies for IDC triggering.

That is, apart from the measurement setting, the UE 2100 may additionally receive an uplink frequency for IDC triggering on the FDD band.

According to another embodiment of the present invention, the IDC configuration information may include a list of uplink frequencies excluding uplink frequencies that are SIB2-connected through the measurement object. For example, the list of uplink frequencies may consist of EARFCN values of the uplink frequency.

That is, the IDC configuration information may include an uplink frequency that is SIB2-connected with the measurement object and an uplink frequency excluding the uplink frequency of the TDD band in the measurement object.

The triggering unit 2113 performs IDC triggering. The triggering unit 2113 performs IDC triggering to trigger transmission of IDC assistance information such as an IDC indication when detecting in-device coexistence interference. The IDC triggering may be performed based on an IDC triggering condition set in the terminal 2100.

For example, the IDC triggering may be performed based on whether IDC of the terminal 2100 is in progress according to the determination in the terminal 2100. That is, the IDC triggering condition may be whether the IDC is in progress as described above with reference to FIG. 16, and the criterion may be based on a determination inside the terminal 2100.

As another example, IDC triggering may be performed according to a determination inside the terminal 2100 as to whether or not a situation in which communication may be difficult or may be experienced by the IDC situation. In this case, the IDC triggering condition according to the determination of the inside of the terminal 2100 may be set based on a test case, IDC interference strength and activity, PER, or a measurement result.

The transmitter 2115 transmits IDC assistant information to the base station 2150.

According to an embodiment of the present invention, the IDC assistance information may include at least one of an affected frequency list, an interference direction of an affected frequency, and a recommended TDM pattern. The affected frequency list or the interference direction may be information for an FDM based IDC solution, and the recommended TDM pattern may be information for a TDM based IDC solution. In particular, the TDM pattern information may include information for DRX operation.

For example, the form of the list of the affected frequencies may be one of the following two embodiments.

First, the list of affected frequencies may be in the form of a list of measurement object IDs. In this case, when there is an uplink frequency that is not related to the measurement configuration, the list of the affected frequencies having the form of the measurement object ID list may be applied to the case of the second embodiment. In this case, the IDC directional indicator may determine whether the IDC is uplink or downlink.

Second, the list of affected frequencies may be a list consisting of EARFCN values. That is, the list of affected frequencies may be a list including the EARFCN value itself of the frequency band affected by IDC. The list consisting of the EARFCN values of the IDC affected frequencies can be applied to all of the first to fourth embodiments.

Meanwhile, the IDC assistance information may include an IDC indication and may be transmitted through an RRC message. The IDC assistance information may be transmitted together with the measurement result measured by the terminal 2100.

As another example, the IDC assistance information may be transmitted through an InDeviceCoexIndication message. The InDeviceCoexIndication message includes at least one of a list of frequencies affected by IDC, available measurement results, and parameters required for TDM operation (eg, DRX cycle length, DRX offset, DRX activity time, or TDM pattern). can do.

The controller 2110 performs an IDC solution operation with the base station 2150 based on the IDC solution method determined by the base station 2150.

As an example, when the base station 2150 determines the FDM solution, the base station 2150 transmits an RRC connection reconfiguration message to the terminal 2100 together with the measurement setup. In this case, the base station 2150 performs an inter-frequency handover. The selected frequency to be considered as the target frequency for may be transmitted together. Subsequently, the transmitter 2115 transmits the completion of the RRC connection reconfiguration to the base station 2150. Subsequently, the controller 2110 performs the measurement on the set frequency. Subsequently, the transmitter 2115 performs a measurement report to the base station 2150, at which time, an inter-frequency handover procedure may follow.

As another example, when the base station 2150 determines the TDM resolution method, the base station 2150 transmits an RRC connection reconfiguration message to the terminal 2100, and at this time, TDM solution related parameters (eg, DRX is a DRX mechanism). Parameters) may be sent together. Subsequently, the transmitter 2115 transmits a connection reset completion message to the base station 2150. Subsequently, the terminal 2100 and the base station 2150 operate in an agreed TDM pattern. For example, a DRX operation may be performed in an agreed DRX pattern.

The base station 2150 may include at least one of a receiver 2155, a transmitter 2165, and a controller 2160.

The receiver 2155 receives performance information of the terminal 2100. The performance information of the terminal 2100 may be included in an RRC message and transmitted. The performance information of the terminal 2100 may include information of a potential IDC generation frequency band.

As an example of the present invention, the performance information of the terminal 2100 may include a list of all EARFCN values of potential IDC generation frequency bands.

As another example of the present invention, the performance information of the terminal 2100 may include an EARFCN value corresponding to a boundary value of a potential IDC generation frequency band within one operating band. That is, one EARFCN value may be referred to in one operating band.

As another example of the present invention, the performance information of the terminal 2100 further includes an indicator indicating the direction of the boundary value along with the EARFCN value corresponding to the boundary value of the potential IDC generation frequency band within one operating band. can do. The directionality of the threshold may be implicitly determined by the band position at which another wireless system (eg, ISM, GNSS) operates, but may be directly indicated through the indicator. For example, the indicator may indicate whether the boundary value is the upper limit value or the lower limit value.

Meanwhile, when the performance information of the terminal 2100 includes a plurality of EARFCN values or a plurality of directional indicators, potential IDC generation frequency bands in a plurality of operating bands may be indicated based on this.

As another example of the present invention, the performance information of the terminal 2100 may include only a band number of a potential IDC generation frequency band. The entire frequency band indicated by the band number may be transmitted as an IDC capable frequency band.

If the performance information of the terminal 2100 does not include information related to a potential IDC generation frequency band, IDC triggering in the network to which the terminal 2100 belongs based on information on whether the terminal 2100 has IDC avoidance capability. This required uplink or downlink frequency band is set.

The transmitter 2165 transmits an RRC connection reset to the terminal 2100. The RRC connection reset message may include measurement setting related information. In addition, the RRC connection reset information may include IDC configuration information. In one embodiment of the present invention, the IDC configuration information may include both uplink and downlink IDC triggering frequency list. That is, when the base station 2150 sets IDC through the RRC connection reconfiguration process, the base station 2150 sets the IDC triggered frequency without downlink / uplink classification. As an example, the frequency list may consist of a list of EARFCN values.

In this embodiment, since the base station 2150 sets all the uplink / downlink IDC triggering frequency bands to the terminal 2100, the terminal 2100 performs IDC triggering in one or more frequency bands of the received frequency bands. Perform.

In another embodiment of the present invention, the IDC configuration information may not include an additional uplink frequency band. Based on the measurement configuration included in the RRC connection reconfiguration message, the terminal 2100 performs uplink frequency configuration for IDC triggering on uplink frequencies connected to the measurement object and SIB2-. That is, the RRC resetting procedure does not set additional IDC, and sets uplink frequency for IDC triggering according to the measurement configuration.

When the measurement setting is set for the terminal 2100 through the RRC connection resetting, when frequencies of uplink and downlink are separated, such as an FDD band, frequency values indicated by the measurement objects set by the measurement setting Are configured for downlink IDC triggering and configured for uplink IDC triggering with SIB2-linking to respective measurement objects. If the carrier aggregation environment is connected to the main serving cell through the SIB2-connected frequency, the remaining information is transmitted to the SIB2 through the dedicated RRC signaling received from the main serving cell. That is, the uplink frequency for the main serving cell is set through the SIB2-connection, and the uplink frequency for the remaining cells is set through dedicated signaling (eg, RRC signaling).

On the other hand, in the case of the TDD band such as the band 40 in which the frequencies of the uplink and the downlink are not separated, the frequency indicated by the measurement objects set by the measurement configuration is used for uplink IDC triggering and downlink IDC triggering. Is set.

According to another embodiment of the present invention, the IDC configuration information may include an uplink frequency list for IDC triggering. The downlink frequency for IDC triggering is limited based on the measurement object, but the uplink frequency for IDC triggering can be signaled separately. For example, the IDC configuration information may include a list consisting of EARFCN values of uplink frequencies for IDC triggering.

That is, apart from the measurement setting, the transmitter 2165 may additionally transmit an uplink frequency for IDC triggering on the FDD band.

According to another embodiment of the present invention, the IDC configuration information may include a list of uplink frequencies excluding uplink frequencies that are SIB2-connected through the measurement object. For example, the list of uplink frequencies may consist of EARFCN values of the uplink frequency.

That is, the IDC configuration information may include an uplink frequency that is SIB2-connected with the measurement object and an uplink frequency excluding the uplink frequency of the TDD band in the measurement object.

The receiver 2155 receives IDC assistance information from the terminal 2100 that has performed IDC triggering.

According to an embodiment of the present invention, the IDC assistance information may include at least one of an affected frequency list, an interference direction of an affected frequency, and a recommended TDM pattern. The affected frequency list or the interference direction may be information for an FDM based IDC solution, and the recommended TDM pattern may be information for a TDM based IDC solution. In particular, the TDM pattern information may include information for DRX operation.

For example, the form of the list of the affected frequencies may be one of the following two embodiments.

First, the list of affected frequencies may be in the form of a list of measurement object IDs. In this case, when there is an uplink frequency that is not related to the measurement configuration, the list of the affected frequencies having the form of the measurement object ID list may be applied to the case of the second embodiment. In this case, it may be determined whether the IDC is uplink or downlink through the IDC directional indicator.

Second, the list of affected frequencies may be a list consisting of EARFCN values. That is, the list of affected frequencies may be a list including the EARFCN value itself of the frequency band affected by IDC. The list consisting of the EARFCN values of the IDC affected frequencies can be applied to all of the first to fourth embodiments.

Meanwhile, the IDC assistance information may include an IDC indication and may be transmitted through an RRC message. The IDC assistance information may be transmitted together with the measurement result measured by the terminal 2100.

As another example, the IDC assistance information may be transmitted through an InDeviceCoexIndication message. The InDeviceCoexIndication message includes at least one of a list of frequencies affected by IDC, available measurement results, and parameters required for TDM operation (eg, DRX cycle length, DRX offset, DRX activity time, or TDM pattern). can do.

The controller 2160 determines an IDC solution and performs an IDC solution with the terminal 2100.

For example, when the controller 2160 determines the FDM solution, the transmitter 2165 transmits an RRC connection reconfiguration message to the terminal 2100 together with the measurement configuration and considers the target frequency for inter-frequency handover. The selected frequencies can be sent together. Subsequently, the terminal 2100 transmits an RRC connection resetting completion to the base station 2150. Subsequently, the terminal 2100 performs the measurement on the set frequency. Subsequently, the terminal 2100 performs a measurement report to the base station 2150, at which time, an inter-frequency handover procedure may be followed.

As another example, when the controller 2160 determines the TDM solution, the transmitter 2165 transmits an RRC connection reconfiguration message to the UE 2100, and at this time, parameters related to the TDM solution (eg, DRX is a mechanism). DRX parameters) may be transmitted together. Subsequently, the terminal 2100 transmits a connection reset completion message to the base station 2150. Subsequently, the terminal 2100 and the base station 2150 operate in an agreed TDM pattern. For example, a DRX operation may be performed in an 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 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 (17)

In a method for transmitting control information by a terminal in a wireless communication system,
Receiving a Radio Resource Control (RRC) connection reconfiguration message from the base station including In-Device Coexistence interference (IDC) configuration information;
Setting a frequency at which uplink IDC triggering is performed based on the IDC configuration information; And
And transmitting IDC assistance information including information related to the uplink IDC triggering to the base station. The method of claim 1,
The IDC setting information,
Control information transmission method comprising a frequency list for uplink and downlink IDC triggering. The method of claim 1,
The terminal,
Setting an uplink frequency for the IDC triggering with respect to a measurement object and a SIB2-linked uplink frequencies set by a measurement configuration included in the RRC connection reconfiguration message. Control information transmission method characterized in that. The method of claim 1,
The IDC configuration information further includes an uplink frequency list for IDC triggering.
The downlink frequency for IDC triggering is set based on a measurement object set by the measurement configuration included in the RRC connection reconfiguration message. The method of claim 1,
The IDC setting information,
And a list of uplink frequencies excluding uplink frequencies that are SIB2-connected through the measurement object set by the measurement configuration included in the RRC connection reconfiguration message. The method of claim 1, wherein
And transmitting UE capability information of the terminal to the base station. The method according to claim 6,
The performance information of the terminal comprises a list consisting of all EARFCN (EARFCN) values of the potential IDC generation frequency band. The method according to claim 6,
The performance information of the terminal comprises a EARFCN value corresponding to the boundary value of the potential IDC generation frequency band in one operation band (operation band). The method of claim 1,
The IDC assistance information includes at least one of an affected frequency list, an interference direction per affected frequency, and a recommended TDM pattern. Transmission method. The method of claim 9,
The affected frequency list is in the form of a measurement object ID list (Measurement object ID list). The method of claim 9,
And the list of affected frequencies is a list consisting of EARFCN values. In a method for transmitting control information by a base station in a wireless communication system,
Transmitting a radio resource control (RRC) connection reconfiguration message including in-device coexistence interference (IDC) configuration information to the terminal;
And receiving IDC assistance information including information related to uplink IDC triggering set based on the IDC configuration information from the terminal. 13. The method of claim 12,
The IDC setting information,
Control information transmission method comprising a frequency list for uplink and downlink IDC triggering. 13. The method of claim 12,
The IDC configuration information further includes an uplink frequency list for IDC triggering.
The downlink frequency for IDC triggering is set based on a measurement object set by the measurement configuration included in the RRC connection reconfiguration message. 13. The method of claim 12,
The IDC setting information,
And a list of uplink frequencies excluding uplink frequencies that are SIB2-connected through the measurement object set by the measurement configuration included in the RRC connection reconfiguration message. In a terminal for transmitting control information in a wireless communication system,
A receiving unit for receiving a Radio Resource Control (RRC) connection reconfiguration message including IDC (In-Device Coexistence interference) configuration information from a base station;
A controller configured to set a frequency at which uplink IDC triggering is performed based on the IDC configuration information; And
It includes a transmitter for transmitting the IDC assistance information including the information related to the uplink IDC triggering to the base station,
The IDC configuration information further includes an uplink frequency list for IDC triggering, and the downlink frequency for IDC triggering is set based on a measurement object set by a measurement configuration included in the RRC connection reconfiguration message. Terminal. A base station transmitting control information in a wireless communication system,
A transmitter for transmitting a Radio Resource Control (RRC) connection reconfiguration message including IDC (In-Device Coexistence interference) configuration information to the terminal;
It includes a receiving unit for receiving from the terminal the IDC assistance information including information associated with the uplink IDC triggering set based on the IDC configuration information,
The IDC configuration information further includes an uplink frequency list for IDC triggering, and the downlink frequency for IDC triggering is set based on a measurement object set by a measurement configuration included in the RRC connection reconfiguration message. Base station.

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