KR20170112173A - Method of perfoming a rate matching for uplink data transmition and appratus thereof - Google Patents

Abstract

The present invention is directed to a wireless communication system and provides a method and apparatus for performing rate matching on an uplink data physical channel to transmit uplink data or sounding reference signals on a license-exempt band.
According to another aspect of the present invention, there is provided a method for controlling uplink subframes, comprising: receiving configuration information of an uplink subframe from a base station; Determining a parameter for performing the rate matching based on the configuration information; And determining a bit length for the uplink data transmission based on the parameter.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rate matching method for performing uplink data transmission,

The present invention relates to wireless communication systems, and more particularly, to a method, apparatus, software, or software for performing rate matching on an uplink data physical channel to transmit uplink data or sounding reference signals on a license- Lt; / RTI >

It is required to support uplink transmission of LAA base stations and terminals operating on a license-unlicensed carrier or frequency (unlicensed carrier or frequency) such as a License Assisted Access (LAA) serving cell.

Uplink transmission may basically require uplink transmission of the LBT scheme by a plurality of terminals since one or more terminals transmit data and / or control signals to the base station. However, There is no specific plan for this.

The present invention provides a method and apparatus for performing optimal rate matching for uplink data transmission in accordance with SRS transmission.

The present invention provides a method and apparatus for efficiently performing rate matching on uplink data when the SRS transmission and the uplink data transmission are performed through different carriers.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

According to an aspect of the present invention, there is provided a method for performing rate matching on uplink data transmission in a wireless communication system, the method comprising: receiving configuration information of an uplink subframe from a base station; Determining a parameter for performing the rate matching based on the configuration information; And determining a bit length for the uplink data transmission based on the parameter.

The features briefly summarized above for the present invention are only illustrative aspects of the detailed description of the invention which are described below and do not limit the scope of the invention.

According to the present invention, in accordance with SRS transmission, a method and apparatus for performing optimal rate matching for uplink data transmission can be provided.

According to the present invention, when the SRS transmission and the uplink data transmission are performed through different carriers, a method and apparatus for efficiently performing rate matching on uplink data can be provided.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention, illustrate various embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is a diagram illustrating a case where an SRS is not transmitted in a subframe in which a PUSCH transmission according to the present invention occurs.
2 is a diagram illustrating a method of processing a blank according to the dropping of the LAA SRS according to the present invention.
FIG. 3 is a diagram illustrating an example in which PUSCH transmission is performed through an ending partial sub-frame according to the present invention.
FIG. 4 is a diagram illustrating a case where PUSCH and SRS on different serving cells according to the present invention overlap in the same symbol.
5 is a diagram for explaining operations of a terminal and a base station according to an example of the present invention.
6 is a diagram for explaining a configuration of a wireless device according to the present invention.

Hereinafter, the contents related to the present invention will be described in detail with reference to exemplary drawings and embodiments. 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 addition, the present invention will be described with respect to a wireless communication network. Operations performed in the wireless communication network may be performed in a process of controlling a network and transmitting or receiving a signal from a system (e.g., a base station) And may be performed in a process of transmitting or receiving a signal from a terminal coupled to the wireless network.

That is, it is apparent that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. A 'base station (BS)' may be replaced by a term such as a fixed station, a Node B, an eNode B (eNB), an access point (AP) In addition, 'terminal' may be replaced with terms such as User Equipment (UE), Mobile Station (MS), Mobile Subscriber Station (MSS), Subscriber Station (SS) .

The terms used to describe the embodiments of the present invention may be described by 3GPP LTE or LTE-Advanced (LTE-Advanced) standards documents, except where explicitly stated to be used in different meanings. It should be noted, however, that this is only for economy and clarity of explanation, and that the embodiments of the present invention are not limited to apply only to systems conforming to 3GPP LTE or LTE-A or subsequent standards.

Table 1 contains a description of the LBT process.

Hereinafter, examples of the present invention for LAA uplink PUSCH (Physical Uplink Shared Channel) and SRS (Sounding Reference Signal) transmission will be described.

The following discussion is for examples of uplink channels (e.g., PUSCH, PUCCH, PRACH, etc.) and SRS transmissions that are transmitted on the UL LBT in the LAA serving cell. PUSCH transmission and SRS transmission are described as a main example, but the present invention is not limited thereto. That is, the following description may also be applied to transmission of an uplink channel other than the PUSCH (for example, PUCCH, PRACH, etc.) and SRS transmission.

The PUSCH in the LAA satisfies regulation of the license-exempt band transmission (e.g., maintaining a constant energy or a certain level of Power Spectral Density (PSD) per frequency unit (e.g., 1 MHz) within the entire system band) , It can be uniformly and constantly allocated in the entire frequency band in such a manner as to have a plurality of clusters (for example, a unit including at least one continuous PRB).

On the other hand, transmitting an uplink reference signal (for example, a sounding reference signal (SRS)) from the perspective of one terminal can be performed together with transmission of the PUSCH.

For example, the UE may transmit some SC-FDMA symbols (e.g., the last symbol of the SC-FDMA symbols to be PUSCH-transmitted on the channel occupied via UL LBT for PUSCH transmission (SC-FDMA symbol having the highest symbol index among the SC-FDMA symbols in the second (back) slot of the subframe (consisting of two slots) in which the PUSCH transmission is performed) Lt; / RTI >

As another example, the terminal may transmit the reference signal independently, regardless of the PUSCH (i.e., without transmitting the PUSCH).

In the embodiments described below, a rate matching method different from whether a sounding reference signal is transmitted in an LAA uplink serving cell is proposed. For convenience of explanation, it is assumed that the sounding reference signal is the SRS transmitted from the UE.

Table 2 contains a description of the subframe setting.

및 셀 특정 서브프레임 오프셋

은 표 3에 예시되어 있고, 프레임 구조 타입 2에 대한 셀 특정(cell-specific) 서브프레임 설정 주기

및 셀 특정 서브프레임 오프셋

은 표 4에 예시되어 있다. The cell-specific subframe setup period for frame structure type 1 defined in Table 2 above

And cell specific subframe offset

Is illustrated in Table 3, and the cell-specific subframe setup period for frame structure type 2

And cell specific subframe offset

Are illustrated in Table 4.

The period and offset values for the cell specific SRS subframe can be set by FDD type (corresponding to frame structure type 1 in Table 3) or TDD type (corresponding to frame structure type 2 in Table 2) And the like. Through the above setting, if information on the SRS sub-frame in the cell is grasped, the UE can recognize the SRS transmission in the cell and consider that there is a potential SRS transmission in the transmission of the PUSCH and / or another uplink channel do. For example, if the UE knows information on the cell-specific SRS subframe, if the cell-specific SRS bandwidth and the PUSCH transmission PRB are at least partially overlapped, the UE transmits the PUSCH in the last SC-FDMA symbol in the cell- And does not perform transmission. Therefore, in order to guarantee reliable SRS transmission of other UEs in a cell even if a specific UE does not perform SRS transmission in a cell-specific SRS transmission sub-frame in actual cell, information on whether the sub-frame is a cell- Can be utilized.

A UE-specific subframe corresponds to a subset of subframes, i.e., a cell-specific SRS subframe, which is capable of actual SRS transmission for each UE. That is, the UE-specific subframe associated with each of Type 0/1 is set in the UE and the UE-specific sounding reference signal can be transmitted in the UE-specific subframe corresponding to each of them. Hereinafter, a method for setting a UE-specific sounding reference signal subframe and a condition for a sounding reference signal transmission subframe will be described in detail.

Table 5 shows a method of establishing a UE-specific SRS subframe corresponding to a terminal type 0 SRS subframe and a description of its transmission conditions.

The Type 0 SRS period and the SRS subframe offset for the FDD serving cell specified in Table 5 above are illustrated in Table 6, and the Type 0 SRS period and the SRS subframe offset for the TDD serving cell are illustrated in Table 7. [

The k _SRS of the TDD serving cell specified in Table 5 is illustrated in Table 8.

Table 9 shows a method of establishing a UE-specific SRS subframe corresponding to a terminal type 1 SRS subframe and a description of its transmission conditions.

The Type 1 SRS period and the SRS subframe offset for the FDD serving cell specified in Table 9 above are illustrated in Table 10, and the Type 1 SRS period and SRS subframe offset for the TDD serving cell are illustrated in Table 11. [

Hereinafter, the PUSCH rate matching operation in the UL LAA will be described in detail.

(PUSCH only), transmission of PUSCH and SRS, and transmission of only SRS (SRS only) are performed in the same subframe of the same serving cell, assuming that PUSCH transmission and SRS transmission are performed in the LAA serving cell. Within the context of the present invention.

In addition, the LAA configuration environment may require a terminal or a base station to establish a carrier aggregation (CA). This takes into account the circumstances in which at least one licensed band of serving cells (e.g. PCell) and a licensed band of secondary serving cells (e.g. LAA SCell) are aggregated. (Eg RRC) setting and the radio link failure / mobility (handover) of the terminal through the PCell serving as the serving cell of the at least one license band, Will perform such dynamics and the unlicensed band SCs may be utilized to reduce the burden of data loading of the licensed band primarily through data offloading. A PUSCH and / or SRS transmission in which a UE having a plurality of serving cells configured with such a licensed serving cell and a non-licensed serving cell can be transmitted in a license serving cell to support efficient uplink data / reference signal transmission, A PUSCH rate matching operation for various combinations such as physical channel and / or signal transmission transmitted in a serving cell may be defined.

In the LAA serving cell, the UE may perform the LBT to determine whether the channel is occupied before performing the uplink transmission. However, if the specific condition is satisfied, the uplink LBT may be omitted. Up to now, two representative methods have been discussed for the terminal LBT. One of the two schemes can be considered by the UE with self-scheduling, and the other scheme can be considered by the UE with the cross-carrier scheduling. Depending on the setup of the terminal and the type of transmission channel / signal, either of two schemes may be selectively applied. Hereinafter, each method will be briefly described.

The following UL LBT Candidate Procedure can be applied for self-carrier scheduling.

As a first example, it is possible to define a Clear Channel Assessment (CCA) duration of 25 microseconds (US) before UL burst transmission to sense the channel during the CCA duration. Here, the duration in which the actual sensing is performed may be equal to or less than the CCA duration.

As a second example, the maximum contention window size can be selected from {3, 4, 5, 6, 7} while applying a defer period of 25us. That is, if the UE senses a channel for a period of 25us delay during the UL CCA and determines that the channel is in an idle state, the number of CCA slots corresponding to the contention window size (i.e., contention window size * CCA slot duration), and if N = 0 (see DL LBT in Table 1), UL transmission can be performed immediately. For example, one CCA slot duration may be 9us. If a channel is detected for each CCA slot and compared with a certain threshold value and more energy is detected, the channel is considered to be busy and the N value is not counted down. Otherwise, the CCA slot of the channel is idle, And the N value can be counted down for each idle CCA slot. Thus, if N = 0 finally, the transmission node can perform transmission immediately.

In the self-carrier scheduling, after a DL burst transmission is performed by the scheduling of the base station within a maximum occupancy time through the downlink LBT performance, an uplink transmission burst (UL burst) transmission may exist. In the same time gap as the maximum of 16 us, it means that the channel is once sensed by the terminal and the uplink transmission can be performed without additional LBT if the channel is not occupied at that time.

Meanwhile, the following UL LBT candidate procedure can be applied for cross-carrier scheduling.

As a first example, you can define a CCA duration of 25us before UL burst transmission to sense the channel during the CCA duration. Here, the duration in which the sensing is performed may be equal to or less than the CCA duration.

As a second example, a delay interval and an additional channel sensing interval may be applied before the UL burst transmission. The size of the delay interval may be less than 25us, and the size of the contention window determining the additional channel sensing interval, such as self- contention window size) may be less than or equal to that applied in the case of DL LBT.

The CCA gap may be defined as a period for performing an LBT, for uplink transmission in an LAA serving cell. Whether a CCA gap exists for the uplink transmission of the LAA serving cell can be indicated by the base station. Specifically, the signaling for the presence of a CCA gap may be performed via the (E) PDCCH with a common grant DCC or scrambled by the CC-RNTI. The CCA gap and the CCA duration mentioned above can be defined as a time interval provided to the UE to perform the LBT in the same sense. The CCA gap may be set to one or two symbols.

Hereinafter, embodiments will be described on the assumption that a CCA gap exists. However, the embodiments to be described below may be applied to applications where the CCA gap is not available. For example, if there is no CCA gap, the rate matching operation for PUSCH transmission may be defined according to SRS / channel occupancy signaling and / or setting, etc., without having to consider the CCA gap.

It is also assumed that the M-TA indicates a plurality of (Multiple) TA (Tracking Area). The base station can set a plurality of serving cell groups (one serving cell group having the same TA value) each having an independent TA to the UE. The M-TA may be interpreted to refer to terminals that have a plurality of TA values and can use a plurality of TA values as timing adjustment values for uplink transmission and / or terminals thus configured.

In addition, the rate matching operation for PUSCH transmission is simply referred to as PUSCH RM.

After UL-SCH channel coding, based on the total number of information bits G for constructing one transport block, a rate matching operation for PUSCH transmission according to various transmissions that may occur in the same subframe and its setting Can be performed. More specifically, when a code block is formed by dividing a transmission block into a plurality of code blocks and a plurality of layers, the number of bits required to form a code block is used as a rate matching output bit ) May be performed before the PUSCH transmission. Here, the G value can be calculated by the following equation (1).

는, UL-SCH 전송 블록이 매핑되는 레이어의 개수를 가리킨다. 수학식 1에 예시된 바와 같이, UL-SCH 데이터 정보를 위한 전체 비트수는, UL-SCH에 할당된 SC-FDMA 심볼의 수(예컨대,

), 주파수 밴드(예컨대,

), 변조 순서(modulation order)(예컨대,

), 잠재적으로 데이터와 멀티플렉싱될 수 있는 CQI 심볼의 수(예컨대,

) 및 RI 심볼의 수(예컨대,

)를 기초로 계산될 수 있다. According to Equation (1), the total number of bits for UL-SCH data information, that is, the total number of bits G required for forming one transport block, can be defined. In this case, in Equation (1)

Indicates the number of layers to which the UL-SCH transport block is mapped. As illustrated in Equation (1), the total number of bits for UL-SCH data information is the number of SC-FDMA symbols assigned to the UL-SCH (e.g.,

), A frequency band (e.g.,

), A modulation order (e.g.,

), The number of CQI symbols that can potentially be multiplexed with data (e.g.,

) And the number of RI symbols (e.g.,

). ≪ / RTI >

는, PUSCH 전송 블록을 위한 현재의 서브 프레임 내, PUSCH 전송을 위해 할당된 스케줄된 대역폭(scheduled bandwidth)을 가리킨다.

Indicates the scheduled bandwidth allocated for the PUSCH transmission in the current subframe for the PUSCH transport block.

는, 서브 프레임 내 PUSCH 전송을 위한 SC-FDMA 심볼의 수를 가리킨다. 이는 하기의 수학식 2와 같다.

Indicates the number of SC-FDMA symbols for PUSCH transmission in a subframe. This is shown in Equation (2) below.

를 기반으로, UL-SCH가 전송되는 하나의 서브프레임 내 이용 가능한 SC-FDMA 심볼의 수

가 계산될 수 있다. Here, the number of SC-FDMA symbols existing in one slot

The number of available SC-FDMA symbols in one subframe in which the UL-SCH is transmitted

Can be calculated.

값은, 0 또는 1로 설정될 수 있다.

의 값이 1인 경우,

는 UL-SCH에 대한 레이트 매칭에 고려될 것이다.Number of subframe SC-FDMA symbols for SRS transmission

The value may be set to 0 or 1.

1 " is " 1 &

Will be considered for rate matching for the UL-SCH.

는 다음의 예에 있어서, 1로 설정될 수 있다.

May be set to 1 in the following example.

이 1로 설정될 수 있다. 실제로는 PUSCH 및 SRS 전송이 수행되지 않지만 이를 위한 자원이 설정된 경우 역시

이 1로 설정될 수 있다. As a first example, when a UE with one UL cell is set to transmit in the same subframe for PUSCH and SRS for initial transmission,

Can be set to one. Actually, when PUSCH and SRS transmission are not performed but resources for this are set,

Can be set to one.

이 1로 설정될 수 있다. As a second example, if the UE transmits PUSCH and SRS in the same subframe in the same serving cell,

Can be set to one.

이 1 로 설정될 수 있다.As a third example, if the PUSCH resource allocation for the current subframe overlaps the cell specific SRS subframe and bandwidth settings at least,

Can be set to one.

이 1로 설정될 수 있다. As a fourth example, if the current subframe in the same serving cell is a UE-specific Type 1 SRS subframe,

Can be set to one.

이 1로 설정될 수 있다.As a fifth example, if the current subframe in the same serving cell is a UE specific type 0 SRS subframe and Multiple TAGs is set in the UE,

Can be set to one.

이 1로 설정될 수 있다.

이 1로 설정되는 다양한 예에 대해서는 후술하기로 한다.In addition to the examples listed above, when the predetermined condition is satisfied,

Can be set to one.

Various examples in which this is set to 1 will be described later.

이 1로 설정되는 경우), UL-SCH 채널을 전송시, SRS 심볼에 대해 PUSCH 전송을 수행하지 않고, 레이트 매칭을 통해 전체 UL-SCH 의 전송 가능한 전체 정보 비트 의 총 수가 결정될 수 있다.In the above listed examples (i.e.,

Is set to 1), the total number of transmittable all information bits of the entire UL-SCH can be determined through rate matching without performing PUSCH transmission on the SRS symbol when transmitting the UL-SCH channel.

은 0으로 설정된다. 이 경우, SRS 심볼에 해당하는 SC-FDMA 심볼에서 PUSCH 전송이 수행될 수 있다If the above-mentioned conditions and predetermined conditions are not satisfied,

Is set to zero. In this case, the PUSCH transmission may be performed in the SC-FDMA symbol corresponding to the SRS symbol

가 정의될 수 있다. 일 예로, 단말이 같은 LAA SCell상에서, 기지국으로부터 현재 서브프레임을 위해 CCA 갭이 존재함을 지시 받았을 경우, CCA 갭을 위한 SC-FDMA 심볼의 수

는, PUSCH 전송을 지시 받은 서브프레임에 대해, 1 또는 2로 설정될 수 있다. 그렇지 않고 만약 CCA 갭이 존재함을 지시 받지 않은 경우에는 그 값은 항상 0이다.For the subframe in which the CCA gap exists, parameters for PUSCH rate matching,

Can be defined. For example, if the UE is instructed to have a CCA gap for the current subframe from the base station on the same LAA SCELL, the number of SC-FDMA symbols for the CCA gap

May be set to 1 or 2 for the subframe that is instructed to transmit the PUSCH. Otherwise, if the CCA gap is not indicated, the value is always zero.

은, UE가 DL 전송이 가능하지만 전체 서브프레임 상에서 전송이 가능하지 않은 부분(partial) 서브프레임에서 PUSCH 전송을 지시 받은 경우, K로 설정될 수 있다. 그렇지 않고 DL 전송이 없는 경우 그 값은 0이다. 이에 대한 상세한 설명은 후술하기로 한다.Number of downlink symbols

May be set to K if the UE is instructed to transmit the PUSCH in a partial subframe that is DL capable but can not be transmitted on the entire subframe. Otherwise, the value is zero if there is no DL transmission. A detailed description thereof will be given later.

Next, the rate matching operation for PUSCH transmission according to various combinations of PUSCH, SRS, CCA gap and the like will be described. In the embodiments described below, the SRS used in the subtitle means that an actual SRS transmission has occurred, [SRS] means that there is no actual SRS transmission but the SRS is dropped in the SRS subframe or the SRS subframe, etc. . In addition, (CCA gap) includes both cases where PUSCH and / or SRS transmission is performed in a subframe including a CCA gap, and PUSCH and / or SRS transmission is performed in a subframe that does not include a CCA gap can do. Therefore, the presence or absence of the CCA map can be considered according to the signaling of the existence of the CCA gap in the subframe in which the PUSCH / SRS is transmitted. For example, PUSCH + SRS may mean that a PUSCH transmission and an SRS transmission occur, and a PUSCH + [SRS] indicates a case where a PUSCH is transmitted but an SRS is not transmitted. PUSCH + SRS + (CCA gap) may mean that a PUSCH transmission and an SRS transmission occur, while a CCA gap is selectively transmitted.

SRS subframe is not transmitted. Even if the actual SRS transmission is triggered or instructed, the neighboring situation (for example, M-TA is not set in the UE and SRS and PUSCH transmission are overlapped in the same subframe of the same serving cell) A case where the SRS transmission is dropped by the base station but the SRS is not performed due to the LBT failure of the terminal) may be included.

In addition, when the SRS subframe is configured, indicated or triggered by the eNB (in this case, the SRS subframe is configured, instructed or triggered means that the SRS subframe is provided, For example, in the SRS subframe, if only UE1 wants to transmit only PUSCH, UE2 to transmit PUSCH and SRS, and UE3 to transmit only SRS, only UE should receive LAA SRS subframe, It can not be seen that the transmission is instructed.) Also, from the viewpoint of the UE such as the UE 1, the SRS can be included in the case where the SRS is not actually transmitted.

At this time, in the uplink sub-frame of the LAA serving cell, the cell specific SRS sub-frame and / or the frequency band are not set through the RRC signaling and the burst and / or sub- Can be indicated. At this time, the dynamic signaling is performed by a common DCI scrambled by a CC-RNTI in a (E) PDCCH or a common search space in a UE-specific search space scrambled by C-RNTI and / or SPS C-RNTI . The SRS transmission frame indication procedure via dynamic signaling may be defined as a new SRS transmission type that is specific to the LAA serving cell. For convenience of description, the SRS transmission frame indication procedure through dynamic signaling as above will be referred to as a UE-specific type 2 SRS.

The Type 2 SRS does not set the SRS subframe through the upper layer signaling, unlike the conventional cell specific SRS subframe or the UE specific SRS subframe setting method. The Type 2 SRS can provide SRS subframe information present in UL bursts via dynamic signaling (e.g., (E) PDCCH) on the common search space, without upper layer signaling.

The Type 2 SRS may include indicating an SRS subframe as an offset value in a subframe in which a CCA gap exists. At this time, the offset value may be set in the upper layer or dynamically indicated on the (E) PDCCH. In this way, triggered SRS transmission by the base station can be performed in the indicated LAA SRS subframe through signaling.

Hereinafter, it is assumed that the SRS transmitted from the serving cell of the LAA is the above-mentioned proposed UE-specific type 2 LAA SRS. However, it can be applied to terminal-specific type 0/1 SRS transmission.

For separation from the LAA serving cell, the secondary serving cell (SCell) in the license-exempt carrier is referred to as LAA SCell. Unless otherwise stated, it is assumed that the SRS transmitted from the LAA SCell is of a frame structure type 3 (i.e., a frame structure type applicable only to the LAA SCell operation).

Based on the above description, the rate matching operation for the PUSCH transmission will be described in detail.

≪ Within the same LAA serving cell / carrier, PUSCH with and without CCA gap and PUSCH RM for SRS transmission >

This embodiment considers the environment in which at least one of the PUSCH, CCA gap and SRS is transmitted in the same subframe in the same LAA serving cell. This embodiment does not consider a single carrier environment but refers to a case in which a serving cell in another LAA setting (specifically, a carrier aggregation (CA) setting environment) and a serving cell in the same subframe in one LAA serving cell PUSCH RM. Specifically, a PUSCH RM operation considering at least one of an SRS, a PUSCH, a CCA gap, and a channel reservation signal that can potentially exist or be transmitted in the same subframe in the LAA serving cell or the LAA SCELL is proposed.

Case 1-1: Same carrier  My (ie, LAA SCell ), PUSCH  + SRS  + ( CCA  gap) If :

값을 기반으로 결정될 수 있다. (수학식 2 참조)The PUSCH RM can be performed on a symbol (i.e., an SC-FDMA symbol) in which actual SRS transmission is performed in a subframe in which the PUSCH is transmitted. The total number of data bits of the PUSCH transmitted in the corresponding sub-

Value. ≪ / RTI > (See Equation 2)

Case 1-2: Same carrier  My (ie, LAA SCell ), PUSCH  + [ SRS ] + ( CCA  gap):

The present embodiment will be described in detail with reference to FIG. 1, it is assumed that an SRS subframe is not transmitted in a subframe in which a PUSCH transmission occurs, but an SRS is not transmitted.

[Method 1-1]

는 항상 1로 설정될 수 있다. 도 1의, UE 1관점에서는 다른 UE의 SRS 전송을 알 수 없기 때문에, 기지국에 의해 스케줄링된 서브프레임이 SRS 서브프레임인지에 대한 정보를 제공받을 필요가 있다. 이 정보는, 위에서 언급한 SRS 서브프레임 지시에 대한 방법으로 동적 시그널링(예를 들어, (E)PDCCH) 또는 준정적(semi-static) 시그널링과 동적 시그널링의 조합을 통해, 기지국이 단말에게 제공할 수 있다. 이러한 시그널링 방법은, 기존 준정적 SRS 서브프레임 설정에 비해, LBT 성공에 따라 점유된 채널에서 SRS 전송을 좀 더 높은 확률로 보장하는 장점을 제공한다. UE 1은 기지국에 의해서 지시 받은 SRS 서브프레임 정보, 같은 서브프레임에서의 CCA 서브프레임 여부 및 스케줄링된 PUSCH가 동시에 같은 서브프레임에서 지시되었는지 여부 등을 고려하여 PUSCH RM을 수행할 수 있다. 또한, CCA 갭이 존재하는 서브프레임에 대한 정보 역시, 기지국에 의해 단말에게 제공될 수 있다.In the LAA serving cell, when the SRS subframe is instructed or set to the terminal,

Can always be set to one. Since the UE 1 can not know the SRS transmission of another UE in FIG. 1, it is necessary to receive information on whether the subframe scheduled by the base station is an SRS subframe. This information may be provided by the base station to the UE via a combination of dynamic signaling (e.g., (E) PDCCH) or semi-static signaling and dynamic signaling as a method for the SRS subframe indication mentioned above . This signaling scheme offers the advantage of ensuring a higher probability of SRS transmission in the occupied channel as the LBT successes, compared to the existing quasi-static SRS subframe setup. The UE 1 can perform the PUSCH RM considering the SRS subframe information indicated by the base station, whether or not the CCA subframe in the same subframe and the scheduled PUSCH are simultaneously indicated in the same subframe, and the like. In addition, information on the subframe in which the CCA gap exists can also be provided to the UE by the base station.

The frequency bandwidth for SRS transmissions to comply with ETSI (Occupied Channel Bandwidth) regulations (specifically, 80% of the total system bandwidth is occupied in transmission) when a new PUSCH resource allocation method (for example, a method of allocating a PUSCH resource in a format that interleaves the system bandwidth) in the LAA SCell is considered when the frequency bandwidth is set, SRS and PUSCH resources Are highly likely to overlap partially or fully with each other. In order to improve the ease of implementation, it is possible to use a method that does not always perform PUSCH transmission in the LAA SRS subframe and does not always transmit PUSCH in the SRS symbol without consideration of overlaps on the frequency band. Even if the LAA SRS is dropped, the PUSCH transmission may not be performed.

[Method 1-2]

는 1로 설정될 수 있다. 그렇지 않은 경우,

는 0으로 설정될 수 있다.In the LAA serving cell, when the cell specific SRS frequency bandwidth for the SRS transmission is indicated or set in the SRS transmission subframe (i.e., LAA SRS subframe) indicated by the base station, the SRS frequency bandwidth is used for PUSCH transmission When overlapping partially or fully with a physical resource block (PRB)

Can be set to one. Otherwise,

May be set to zero.

In the present invention, in order to compensate for the UL transmission opportunity constrained by the LBT for the LAA SRS, even if the LAA SRS of the UE in which the M-TA is not set is superimposed on the same symbol as the PUSCH transmission of another serving cell, And not drop it. Even if the PUSCH and the SRS transmission of the UE in which the M-TA is currently set are overlapped, if the UE is not power-limited, the transmission of the PUSCH and the SRS is allowed, If not power-limited, the PUSCH and LAA SRS transmissions may be granted. This can reduce the probability of SRS transmission on the LAA serving cell being dropped, thereby improving the performance of channel information measurement for LAA DL / UL data scheduling.

Unlike the proposed method, when LAA SRS is dropped, PUSCH RM operation should be defined considering the space caused by SRS drop.

2 is a diagram illustrating a method of processing a blank according to the dropping of the LAA SRS. If the LAA SRS is dropped (for example, even if M-TA is set, in a power limited situation, the SRS may be dropped; in another example, if the UE with concurrent transmission of PUSCH and PUCCH is in the same subframe The SRS may be dropped if the ackNackSRS-SimultaneousTransmission parameter is set to False). Considering that a channel reservation signal is to be transmitted in the space resulting from the SRS drop, the PUSCH RM operation Can be defined.

[Method 1-3]

은 0) 그렇지 않으면(즉, SRS 대역폭 설정이 PUSCH 전송을 위한 PRB와 중복되는 경우), 드롭된 SRS심볼에서 채널 예약 신호(channel reservation signal)를 전송할 수 있다. (이때,

는 1) 도 2의 좌측에서는 드롭된 SRS 심볼에서 채널 예약 신호 CR 이 전송되는 것이 도시되어 있고, 도 2의 우측에서는 드롭된 SRS 심볼에서 PUSCH가 전송되는 것이 도시되어 있다.If the cell specific SRS bandwidth setting does not overlap with the PRB for PUSCH transmission in the LAA subframe instructed to the UE, the PUSCH transmission can be performed on the dropped SRS symbol. (At this time,

0). Otherwise (i.e., if the SRS bandwidth setting is overlapped with the PRB for PUSCH transmission), a channel reservation signal may be transmitted in the dropped SRS symbol. (At this time,

1) that the channel reservation signal CR is transmitted in the dropped SRS symbol on the left side of FIG. 2, and the PUSCH is transmitted in the dropped SRS symbol on the right side in FIG.

[Method 1-4]

은 1로 설정될 것이다.Regardless of whether the SRS bandwidth setting overlaps with the PRB for PUSCH transmission, the PUSCH RM for the channel reservation signal transmission of the method 1 can be applied without performing the PUSCH transmission in the dropped SRS symbol. In this case, as in method 1,

Will be set to one.

Case 1-3: Same carrier  My (ie, LAA SCell ) PUSCH  + ( SRS  or [ SRS ]) + CCA gap + PDSCH / (E) PDCCH  (In this case, the uplink and downlink transmission are performed in the uplink and downlink transmission, eNB  The DL On LBT  ≪ / RTI > in the same subframe within the occupied burst)

The present embodiment will be described in detail with reference to FIG. 3 is a diagram illustrating an example in which PUSCH transmission is performed through an end partial subframe.

The three cases shown in Fig. 3 correspond to the DL burst and the UL burst being performed within the MCOT occupied by the base station. Referring to FIG. 3A, it can be seen that there is a CCA gap immediately after the PDSCH (or EPDCCH). If the LBT is performed in the CCA gap before the PUSCH transmission in the same subframe and the channel is successfully occupied as a result, the PUSCH transmission can be performed. (b), it is assumed that the SRS transmission is performed together with the PUSCH transmission. The SRS transmission can be performed in the last symbol of the same subframe with the CCA gap immediately after PDSCH (or EPDCCH). the example shown in (b) is advantageous in that the position of the SRS symbol can be fixed without affecting the number of symbols to which the PDSCH is transmitted, and the usability of the implementation can be improved.

(c), it is assumed that the CCA gap and the SRS transmission are consecutively allocated after the PDSCH transmission, unlike the case shown in (b). The example shown in (c) provides an advantage that only the PUSCH or the terminals transmitting the PUSCH and the SRS can be multiplexed in the same subframe with the terminals transmitting only the SRS. On the other hand, the location of the SRS symbol is variably determined according to the number of symbols to which the PDSCH is transmitted, which is difficult to implement.

The PUSCH RM performing method for each case shown in FIG. 3 will be described in detail.

만큼 가 감소하게 될 것이다.If the DL burst and the UL burst are present in one subframe, in addition to those described in cases 1-1 and 1-2, a DL transmission (Tx) (e.g., (E) PDCCH / PDSCH or DRS Reference Signal) is performed, the PUSCH transmission is not performed. In this case, the number of PUSCH transmission symbols will be reduced by the number of downlink symbols. Referring to Equation (2), the number of PUSCH transmission symbols is the number of downlink symbols

Will decrease.

The K value may be set to the number of symbols corresponding to a DL transmission in an initial partial DL subframe or an end partial DL subframe. In the terminated partial downlink sub-frame, the number of symbols corresponding to the DL transmission can be indicated on the PDCCH that transmits the common DCI format 1C scrambled by the CC-RNTI. For example, Table 12 below illustrates the number of symbols corresponding to the DL transmission of the terminated partial downlink subframe. Referring to Table 12, in the terminal partial DL subframe, the number of symbols for which DL transmission can be performed can be determined to be one of {3, 6, 9, 10, 11, 12, 14}.

When DL transmission is started in the first partial DL subframe and the second slot, K = 7 can be set.

≪ PUSCH RM for when SRS and PUSCH are transmitted through different carriers >

Case 2: Other Carrier  through, PUSCH  (E.g, PCell ) + SRS / PUSCH  (E.g, LAA SCell ) If :

[Method 1]

4 is a diagram showing a case where PUSCH and SRS on different serving cells overlap in the same symbol.

는 1로 설정될 것이다.4, if the LAA SRS transmission in the LAA serving cell is performed in the same symbol as the PUSCH transmission in another serving cell, even if the M-TA is not set in the UE, If the UE is not power limited, both PUSCH and SRS can be transmitted without dropping the SRS. In this case, since the LAA SRS is transmitted, a rate matching operation can be performed on the PUSCH transmission in the same subframe of the same serving cell. together,

Will be set to one.

는 1로 설정될 수 있다. If the UE is in a power limited case or the SRS is overlapped with the PUCCH with HARQ-ACK / SR and the LAA SRS is dropped, the rate matching operation is performed in the PUSCH transmission in the same subframe of the same serving cell . Even in this case,

Can be set to one.

[Method 2]

If the SRS drop is determined according to the M-TA setting, the rate matching operation for the PUSCH transmission will be described.

Case 2-1. UE  M- TA  If not set, SRS and PUSCH  If the transmission is in a different serving cell If ,

[Method 2-1]

When the SRS transmission is instructed to be performed in a licensed cell (e.g., a PCell or a SCell in a licensed cell), the SRS is dropped if it overlaps the PUSCH of another serving cell. Otherwise (for example, When the SRS is instructed to perform SRS transmission in the LAA SCELL, the SRS is overlapped with the PUSCH of another serving cell), the SRS is transmitted with the PUSCH without dropping.

In addition, between the LAA scellings, it may be considered that the SRS is superimposed on the same symbol as the PUSCH. In this case, the SRS may be dropped when the SRS in the first LAA SCELL and the PUSCH in the second LAA SCELL are duplicated in the same symbol of the same subframe of another serving cell.

은 0으로 설정될 수 있다. If the SRS transmission in the license serving cell overlaps with the PUSCH transmission in the PUSCH transmission sub-frame of the unlicensed serving cell, the SRS can be dropped. In order to perform PUSCH rate matching in the license-exempt serving cell

Can be set to zero.

[Method 2-2]

는 0으로 설정될 수 있다. The SRS can always be dropped regardless of whether the SRS is transmitted in either the LAA SCell or the license cell (e.g., PCell or SCell). Since the SRS is dropped, the PUSCH RM is not performed on the SRS transmission symbol.

May be set to zero.

[Method 2-3]

는 1으로 설정될 수 있다. The SRS can always be transmitted regardless of whether the SRS is transmitted in either the LAA SCell or the license cell (e.g., PCell or SCell). In this case, the PUSCH RM can be performed on the SRS transmission symbol. Accordingly,

May be set to one.

는 0으로 설정될 수 있다. 이에 따라, SRS와 PUSCH는 서로 다른 서빙셀/캐리어에서 전송될 수 있다. As another example, the PUSCH RM may not be performed for the SRS transmission symbols.

May be set to zero. Accordingly, SRS and PUSCH can be transmitted in different serving cells / carriers.

Case 2-2 UE  M- TA  If set,

The above-described method 2-1 may be applied.

5 is a diagram for explaining operations of a terminal and a base station according to an example of the present invention.

In step S510, the base station eNB may provide information related to the CCA gap, the SRS sub-frame, and the DL sub-frame to the UE. For example, the number and location of available symbols for a CCA gap within a subframe or slot, the number and location of available symbols for SRS transmission within a subframe or slot, The base station can provide information on the number and location of available symbols to the terminal.

In step S520, the BS can provide information on whether the PUSCH transmission is instructed in the license-exempt serving cell to the MS. For example, the BS may provide the UE with information on whether the PUSCH transmission is instructed in the unlicensed serving cell or the PUSCH transmission is instructed in the license serving cell.

In step S530, the UE can determine parameters for PUSCH rate matching based on the CCA gap, the SRS, the DL partial subframe information, and whether SRS transmission and PUSCH transmission are performed through different carriers.

는 1 또는 2로 설정되고, CCA 갭이 존재하지 않는 경우,

는 0으로 설정된다. SRS이 존재하는 경우,

는 실제 SRS 전송이 있는지 또는 SRS 서브프레임내 PUSCH 전송 PRB와의 관계 또는 SRS 서브프레임내 SRS이 드롭되는지 또는 채널점유신호가 전송되는지 여부에 따라 0 또는 1로 설정되고, SRS 전송이 존재하지 않는 경우,

는 0으로 설정된다. DL 부분 서브프레임이 존재하는 경우,

은 DL 수신이 지시된 심볼 개수에 따라 설정될 수 있다.For example, when the SRS transmission and the PUSCH transmission are performed through the same carrier, the parameters for PUSCH rate matching may be set as follows. If there is a CCA gap,

Is set to 1 or 2, and if there is no CCA gap,

Is set to zero. If SRS is present,

Is set to 0 or 1 depending on whether there is an actual SRS transmission or a relationship with the PUSCH transmission PRB in the SRS subframe or whether SRS in the SRS subframe is dropped or a channel occupancy signal is transmitted and if no SRS transmission exists,

Is set to zero. If there is a DL partial sub-frame,

May be set according to the number of symbols to which DL reception is directed.

는 0 또는 1로 설정될 수 있다. As another example, when the SRS transmission and the PUSCH transmission are performed through different carriers, depending on whether the SRS is dropped or the M-TA of the terminal is set,

Can be set to 0 or 1.

In step S540, the terminal performs rate matching on the PUSCH transmission based on the parameters determined in step S530. Through rate matching, the transport block can be divided into a plurality of code blocks, and the PRB mapping of the code blocks can be performed.

In step S550, the terminal can transmit the PUSCH to the base station.

Although the above-described exemplary methods are represented by a series of acts for clarity of explanation, they are not intended to limit the order in which the steps are performed, and if necessary, each step may be performed simultaneously or in a different order. In addition, not all illustrated steps are necessary to implement the method according to the present invention.

The foregoing embodiments include examples of various aspects of the present invention. While it is not possible to describe every possible combination for expressing various aspects, one of ordinary skill in the art will recognize that other combinations are possible. Accordingly, it is intended that the invention include all alternatives, modifications and variations that fall within the scope of the following claims.

The scope of the present invention includes devices (e.g., wireless devices and components thereof described with reference to FIG. 6) that process or implement operations in accordance with various embodiments of the present invention.

6 is a diagram for explaining a configuration of a wireless device according to the present invention.

6 illustrates a terminal apparatus 100 corresponding to an example of a downlink receiving apparatus or an uplink transmitting apparatus and a base station apparatus 200 corresponding to an example of a downlink transmitting apparatus or an uplink receiving apparatus.

The terminal device 100 may include a processor 110, an antenna unit 120, a transceiver 130, and a memory 140. [

The processor 110 performs baseband-related signal processing, and may include a first module 111 and a second module 112. The first module 111 may process an operation of a MAC (Medium Access Control) layer, an RRC (Radio Resource Control) layer, or a higher layer. The second module 112 may process the operation of the physical (PHY) layer (e.g., uplink transmission signal processing, downlink reception signal processing). The processor 110 may control the overall operation of the terminal device 100, in addition to performing baseband-related signal processing.

, SRS를 위해 할당된 심볼의 개수를 가리키는

, DL 부분 서브프레임을 위해 할당된 심볼의 개수를 가리키는

을 포함할 수 있다.More specifically, the processor 110 of the terminal performs a PUSCH rate matching operation based on the information related to the CCA gap, the SRS sub-frame, the DL sub-frame, and information on whether or not the PUSCH transmission is instructed through the license-exempt serving cell Can be determined. Here, the rate matching parameter is a rate matching parameter that indicates the number of symbols allocated for the CCA gap

, The number of symbols allocated for the SRS

, The number of symbols allocated for DL partial subframes

. ≪ / RTI >

는 1 또는 2로 설정되고, SRS 전송이 지시되는 경우,

는 0 또는 1로 설정된다. DL 부분 서브프레임이 존재하는 경우,

은 DL 수신이 지시된 심볼 개수에 따라 가변한다..If there is a CCA gap,

Is set to 1 or 2, and when the SRS transmission is instructed,

Is set to 0 or 1. If there is a DL partial sub-frame,

Varies according to the number of symbols to which DL reception is directed.

Once the rate matching parameter is determined, the processor 110 of the terminal may perform a rate matching operation on the PUSCH transmission based on the transmitted parameters. For performing the rate matching operation, the total number of bits for the UL-SCH data information can be calculated. In this case, the total number of bits for UL-SCH data information includes the number of SC-FDMA symbols allocated to the UL-SCH, the frequency band, the modulation order, the number of CQI symbols that can be multiplexed with data and the number of RI symbols . ≪ / RTI >

,

,

등의 파라미터를 통해 계산될 수 있다.In addition, the number of SC-FDMA symbols allocated to the UL-

,

,

And so on.

A rate matching operation for PUSCH transmission allows a transport block to be divided into a plurality of code blocks, and a code block can be mapped to a resource block.

The antenna unit 120 may include one or more physical antennas, and may support MIMO transmission / reception when the antenna unit 120 includes a plurality of antennas. The transceiver 130 may include a radio frequency (RF) transmitter and an RF receiver. The memory 140 may store information processed by the processor 110, software related to the operation of the terminal device 100, an operating system, applications, and the like, and may include components such as buffers.

The base station apparatus 200 may include a processor 210, an antenna unit 220, a transceiver 230, and a memory 240.

The processor 210 performs baseband-related signal processing, and may include a first module 211 and a second module 212. The first module 211 may process operations of the MAC layer, the RRC layer, or higher layers. The second module 212 may process the operation of the PHY layer (e.g., downlink transmission signal processing, uplink received signal processing). In addition to performing baseband related signal processing, the processor 210 may also control operation of the entire base station apparatus 200. [

More specifically, the processor 210 of the base station can provide the terminal with information related to the CCA gap, the SRS sub-frame, and the DL sub-frame. In addition, the BS may further provide information on whether the PUSCH transmission is instructed in the unlicensed serving cell to the MS. The information provided to the terminal may be used to determine rate matching parameters for PUSCH transmission.

When the LAA SRS is received from the UE, the processor 210 can measure and evaluate the UL channel based on the received LAA SRS. In addition, the processor 210 may transmit an HARQ ACK acknowledgment for the received PUSCH.

The antenna unit 220 may include one or more physical antennas, and may support MIMO transmission / reception when the antenna unit 220 includes a plurality of antennas. The transceiver 230 may include an RF transmitter and an RF receiver. The memory 240 may store information processed by the processor 210, software related to the operation of the base station 200, an operating system, applications, and the like, and may include components such as buffers.

The operation of the processor 110 of the terminal 100 or the processor 210 of the base station 200 described above may be implemented by software processing or hardware processing or may be implemented by software and hardware processing.

The scope of the present invention includes software (or an operating system, application, firmware, program, etc.) that enables an operation according to various embodiments of the present invention to be performed on a device or computer, It includes a possible medium.

While various embodiments of the present invention have been described with reference to 3GPP LTE or LTE-A systems, they may be applied to various mobile communication systems.

Claims (4)

A method for performing rate matching on uplink data transmission in a wireless communication system,
Receiving configuration information of an uplink subframe from a base station;
Determining a parameter for performing the rate matching based on the configuration information; And
Determining a bit length for the uplink data transmission based on the parameter;
/ RTI >
The method according to claim 1,
Wherein the configuration information comprises SRS (Sounding Reference Signal) subframe information, the parameter including a parameter indicating the number of symbols allocated for SRS transmission.
3. The method of claim 2,
Wherein the parameter is variable depending on whether the terminal performs the SRS transmission.
3. The method of claim 2,
Wherein if the SRS transmission and the uplink data transmission are performed through different carriers, the parameter is determined based on whether a Multiple TA (Tracking Area) is set in the terminal.

Images