JP6555396B2 - User equipment and method performed by base station - Google Patents

Description

  Embodiments of the present invention generally relate to communication technologies. More particularly, embodiments of the present invention relate to a method and apparatus for performing fractional subframe transmission.

  In the 3rd Generation Partnership Project (3GPP), a network structure and various technologies required for moving a terminal between a 3GPP wireless communication network and a wireless local area network (WLAN) network are described in an interworking WLAN (interworking WLAN). ). Multi-mode wireless communication technology has evolved to use multiple wireless communication technologies simultaneously. Therefore, simultaneous use of a plurality of wireless communication technologies increases the transfer rate per unit time or increases the reliability of the terminal.

  In wireless communications, spectrum is a very scarce resource. A licensed band represents a frequency band that is exclusively licensed to provide a specific radio service to a specific operator. An unlicensed band, on the other hand, represents a frequency band that has not been assigned to a particular operator and has been released so that all entities that meet a given requirement can use that frequency band.

  In some parts of the world, unlicensed bandwidth technology needs to follow certain rules, such as Listen-Before-Talk (LBT) and channel bandwidth occupancy requirements. LBT results in channel availability uncertainty. For example, unlicensed bandwidth may be available at any time in a subframe.

  WLAN using Wireless Fidelity (WiFi) is a typical wireless communication technology used in an unlicensed band. The current granularity of Long Term Evolution (LTE) is much greater than that of WiFi, which results in the low competitive strength of License Assisted Access (LAA) with LBT. As such, just as between LTE operators, fair coexistence between LTE and other technologies such as WiFi is expected. Fractional subframe transmission can be performed to be more competitive in the unlicensed band.

  The fractional subframe transmission can use at least one fractional subframe. The termination of the fractional subframe transmission may be uncertain simply because the symbol portion of the fractional subframe is available for data transmission. However, for both transmitter and receiver, termination of fractional subframe transmission is an important factor for efficiently performing fractional subframe transmission. It is therefore necessary to estimate the end of the fractional subframe transmission.

  The present invention proposes a solution for fractional subframe transmission. In particular, the present invention provides a method and apparatus for estimating the end of a fractional subframe transmission.

  According to a first aspect of an embodiment of the present invention, an embodiment of the present invention provides a method for performing a fractional subframe transmission. The method determines first temporal information indicating when a channel becomes available, and terminates the fractional subframe transmission based on the first temporal information and transmission opportunity information. Determining second temporal information to indicate. The method may be performed at a transmitter or a receiver.

  According to a second aspect of an embodiment of the present invention, an embodiment of the present invention provides an apparatus for performing a fractional subframe transmission. The apparatus includes: a first determination unit that determines first temporal information indicating when a channel becomes available; and the fractional subframe based on the first temporal information and transmission opportunity information. A second determination unit that determines second temporal information indicating the end of the transmission. The apparatus can be implemented in a transmitter or a receiver.

  Other features and advantages of embodiments of the present invention will become apparent when the following description of specific embodiments is read in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the embodiments.

  Embodiments of the invention are shown by way of example and their advantages are explained in more detail below with reference to the accompanying drawings.

2 shows a flowchart of a method 100 for performing fractional subframe transmission according to an embodiment of the present invention.

FIG. 6 shows a flowchart of a method 200 for performing fractional subframe transmission at a transmitter according to an embodiment of the invention.

FIG. 6 shows a flowchart of a method 300 for performing fractional subframe transmission at a receiver according to an embodiment of the invention.

FIG. 4 shows a schematic diagram 400 of a fractional subframe transmission according to an embodiment of the present invention.

FIG. 6 shows a schematic diagram 500 of a fractional subframe transmission according to an embodiment of the present invention.

FIG. 6 shows a schematic diagram 600 of a fractional subframe transmission according to an embodiment of the present invention.

FIG. 6 shows a block diagram of a transmitter apparatus 710 and a receiver apparatus 720 that perform fractional subframe transmission according to an embodiment of the present invention.

  In the figures, the same or similar reference numerals indicate the same or similar elements.

  The subject matter described herein is described with reference to several exemplary embodiments. It should be understood that these embodiments are not meant to limit the scope of the subject matter, but are described only to enable those skilled in the art to better understand.

  The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms are intended to include the plural unless the context clearly indicates otherwise. Also, when the terms “comprising”, “comprising”, “including” and / or “including” are used herein, the stated features, integers, steps, operations, elements, and / or Or it is understood that the presence of a component is specified, but it does not exclude the presence or addition of one or more other features, integers, steps, actions, elements, components, and / or groups thereof.

  Also, in some alternative implementations, the functions / operations shown may occur contrary to the order shown in the drawings. For example, two functions / operations shown in succession may actually be performed simultaneously, or sometimes in reverse order, depending on the functions / operations involved.

  Embodiments of the present invention are directed to solutions for performing fractional subframe transmission. The solution may be executed between the receiver and the transmitter. Specifically, the transmitter determines first temporal information indicating when the channel becomes available, and based on the first temporal information and transmission opportunity information, the transmitter determines the fractional subframe transmission. You may determine the 2nd time information which shows completion | finish. The receiver may similarly determine the second temporal information. As such, both the transmitter and the receiver may determine the end of the fractional subframe transmission without introducing signaling overhead.

  In an embodiment of the present invention, the fractional subframe may refer to a subframe for a downlink transmission or a subframe for an uplink transmission, and a portion of the fractional subframe may include control information or data. The other part is not used for transmission. For example, for a subframe comprising 14 symbols, if the first 8 symbols are not used for transmission and only the last 6 symbols are used for transmission, this subframe is called a fractional subframe. May be considered. As another example, if the first 7 symbols of a subframe are used for transmission and the remaining symbols of the subframe are not used for transmission, this subframe is also considered a fractional subframe. May be.

  In this disclosure, a fractional subframe transmission may refer to a transmission performed in one or more subframes, at least one of the one or more subframes is a fractional subframe. . As an example, a fractional subframe transmission, for example, the first subframe is a fractional subframe, the last subframe is a fractional subframe, and the first and last subframe are fractional subframes. , Etc. may be included.

  In some embodiments, the fractional subframe transmission may be a downlink or uplink cellular transmission. In the downlink transmission, the receiver is a user equipment (UE (User) such as a terminal, a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a mobile station (MS), or an access terminal (AT)). Equipment)). On the other hand, the transmitter may be a base station (BS) such as node B (NodeB or NB) or evolved NodeB (eNodeB or eNB). In the uplink transmission, the transmitter may be a UE and the receiver may be a BS.

  According to some other embodiments of the present invention, the fractional subframe transmission may be a D2D transmission. In that case, the receiver may be a Device-to-Device (D2D) receiver, and the transmitter may be a D2D transmitter.

  Embodiments of the present invention can be applied to various communication systems including, but not limited to, a Long Term Evolution (LTE) system or a Long Term Evolution Advanced (LTE-A) system. Given the rapid development in communications, it will be appreciated that the present invention may be embodied in future types of wireless communications technologies and systems. The scope of the invention should not be considered limited to the systems described above.

  Hereinafter, some exemplary embodiments of the present invention will be described with reference to the drawings. Reference is first made to FIG. 1 showing a flowchart of a method 100 for performing fractional subframe transmission at a transmitter according to an embodiment of the present invention. Method 100 may be performed at a transmitter and other suitable equipment. Alternatively, method 100 may be performed at a receiver and other suitable equipment.

  The method 100 begins at step S110 where first temporal information is determined, where the first temporal information indicates when a channel is available.

  In the context of this disclosure, a subframe may comprise multiple symbols. As an example, the subframe is 1 ms, and may include, for example, 14 symbols from 0 to 13 symbols. Positions such as potential position (target position), target position (target position), current position (current position), next position (next position) are time points or time periods in a subframe. Can point to. In some embodiments, the position may correspond to a moment in a subframe. Alternatively, the position may correspond to a subframe symbol. In so doing, the position may occupy a time period, for example a symbol time period. The target position may indicate a position where the fractional transmission can start, and the potential position may indicate a predetermined position that is a candidate for the target position.

ここで、Ｎは、サブフレームのシンボルのインデックスを示し、Ｎｄは、２つのポテンシャルポジションの間の間隔を示し１から例えば１４のようなサブフレームにおけるシンボルの総数までの範囲の整数であってもよい。式（１）によれば、Ｎｄが小さいほど、ポテンシャルポジションの密度が高いことを判定し得る。いくつかの実施の形態において、サブフレームの各シンボルはポテンシャルポジションとして予め定められてもよい。 There may be one or more predetermined potential positions in the subframe. Each potential position may correspond to a symbol of a subframe periodically or aperiodically. In some embodiments, potential positions may be provided every third symbol, eg, symbols 0, 3, 6, 9, and 12. For example, the potential position may be set as follows.

Here, N indicates a symbol index of a subframe, Nd indicates an interval between two potential positions, and may be an integer ranging from 1 to the total number of symbols in a subframe such as 14, for example. Good. According to Expression (1), it can be determined that the smaller the Nd, the higher the density of potential positions. In some embodiments, each symbol of a subframe may be predetermined as a potential position.

  In addition, the above-mentioned illustration is description which is not limited and is illustrated. It can be appreciated that in alternative embodiments, there may be an aperiodic configuration of potential positions. For example, the potential position may correspond to symbols 0, 3, 8, and 12.

  Clear Channel Assessment (CCA) or Extended Clear Channel Assessment (eCCA) may be performed, for example, by a transmitter to detect whether a channel is available. In response to detecting that the channel becomes available, it may be detected whether the current position is a potential position. When the current position is a potential position, the current position may be determined as the target position. Alternatively, a channel occupation signal may be transmitted from the current position to the potential position, and this potential position may be determined as the target position. In some embodiments, this potential position may be the potential position immediately after the current position. For example, if the current position corresponds to symbol 5 and there are three predetermined potential positions corresponding to symbols 0, 7, and 11, the potential position corresponding to symbol 7 is the current position. It can be determined that the potential position is immediately after, and can be determined as the target position.

  According to an embodiment of the present invention, the fractional subframe transmission may be a symbol-level transmission. That is, the fractional subframe transmission may end with any symbol of the subframe. In this case, the last subframe of the fractional subframe transmission can be a fractional subframe. The first temporal information can be determined in several ways. In some embodiments, it may be determined whether a channel becomes available in the first subframe symbol. In response to determining that the channel is available, the first temporal information may be determined to include a symbol index. Alternatively, in some embodiments, in response to determining that the channel is available, determining that the first temporal information includes a predetermined potential position of the first subframe. Where the potential position is just before the symbol. Details are described with reference to FIGS.

  Alternatively, the fractional subframe transmission may be a subframe-level transmission. In this case, the fractional subframe transmission may end with a complete subframe. That is, the last subframe of the fractional subframe transmission is a complete subframe, not a fractional subframe. According to the embodiment of the present invention, in step S110, the first subframe in which the channel becomes available may be determined. As a result, it can be determined that the first temporal information includes the index of the first subframe.

  In some embodiments, step S110 may be performed by a transmitter. In this case, the first subframe may be determined based on the CCA / eCCA performed by the transmitter. Specifically, when the transmitter detects that a channel becomes available in a subframe, this subframe may be determined as the first subframe.

  In other embodiments, step S110 may be performed by a receiver. In an exemplary embodiment, the transmitter may notify the first temporal information, for example, by transmitting an indicator regarding the first temporal information to the receiver. In this way, the index of the first subframe where the channel becomes available may be explicitly indicated. Accordingly, in step S110, the receiver may determine the first temporal information by detecting the indicator. In an alternative embodiment, the transmitter may not send an indicator and the receiver may perform blind decoding for the fractional subframe transmission control information at the potential position. In response to successful blind decoding, the receiver may determine the index of the first subframe of the fractional subframe transmission.

  In step S120, second temporal information indicating the end of the fractional subframe transmission may be determined based on the first temporal information and the transmission opportunity information.

  According to the embodiment of the present invention, the transmission opportunity information may include a channel occupation time, for example, a maximum channel occupation time, an average channel occupation time, and the like. Transmission opportunity information may be determined based on rules or other possible aspects. In addition or alternatively, the transmission opportunity information may be set by higher layer signaling or may be preset to be fixed.

  In some embodiments in which symbol level transmission is performed in step S120, the number of symbols used by the fractional subframe transmission may be determined based on transmission opportunity information. As a result, the number of ending symbols can be determined based on the first temporal information and the number of symbols used by the fractional subframe transmission, where the ending symbol is a fractional subframe. Used by the transmission and belongs to the last subframe of the fractional subframe transmission. Details will be described with reference to FIGS.

  Alternatively, in some embodiments where subframe level transmission is performed in step S120, the index of the last subframe used by the fractional subframe transmission is in the first temporal information and transmission opportunity information. It may be determined based on.

ここで、Ｎ１は、最初のサブフレームのインデックスを示し、Ｎｅは、最後のサブフレームのインデックスを示し、ＴＸＯＰは、ミリ秒（すなわち、ｍｓ）でチャネル占有時間を示し、ｆｌｏｏｒ（）は、切り捨て（rounding down）の演算を示す。 In the exemplary embodiment, the index of the last subframe may be determined as follows.

Here, N1 indicates the index of the first subframe, Ne indicates the index of the last subframe, TXOP indicates the channel occupation time in milliseconds (ie, ms), and floor () is truncated. (Rounding down) is calculated.

  FIG. 6 shows a schematic diagram 600 of a subframe level fractional subframe transmission according to an embodiment of the present invention. As shown in FIG. 6, there are four subframes, namely subframes 0-3. For subframe 0, there are two potential positions 621 and 622, with the first potential position 621 corresponding to the start of subframe 0. CCA / eCCA may start from the initial potential position 621, and the potential position 622 may be determined as the target position. As a result, the fractional subframe transmission may start from the target position and end at the end of subframe 2. Thus, the true channel occupation time indicating the actual time period occupied by the fractional subframe transmission may correspond to the time period from position 622 to 623. Assuming that TXOP is 3 ms and corresponds to the time period from position 622 to position 624, the actual channel occupation time is from position 622 to position 623, and the time period from position 623 to position 624 Can be determined not to be occupied. In the embodiment of FIG. 6, since the first subframe is subframe 0, the index of the first subframe is zero. Therefore, according to Equation (2), it can be determined that the index of the last subframe Ne is 0 + 3-1 = 2. That is, the last subframe can be determined as subframe 2.

  According to an embodiment of the present invention, optionally, when symbol level transmission is performed, the method 100 may further comprise the step of comparing the number of ending symbols with a predetermined threshold. The last subframe may be released in response to the number of end symbols being less than or equal to a predetermined threshold. In an alternative embodiment, the end symbol may be combined with the subframe immediately preceding the last subframe in response to the number of end symbols being less than or equal to a predetermined threshold. In the present disclosure, the combination of the end symbol and the subframe immediately before the last subframe may be referred to as a “super subframe”. According to an embodiment of the present invention, the predetermined threshold may be set as a fixed value, for example, 3 or a value that is dynamically changed. The exemplary embodiments described above are not to be construed as limiting in any way the subject matter described herein, but are to be understood as illustrative only. The predetermined threshold may be implemented in any other suitable manner.

  According to an embodiment of the present invention, optionally, when the transmitter performs the method 100, the transmitter determines the transport block size based on the number of end symbols and transports the last subframe. Block size data may be transmitted. Details may be described with reference to FIG.

  According to an embodiment of the present invention, optionally, when the receiver performs the method 100, the receiver determines the transport block size based on the number of end symbols and transports the last subframe. Block size data may be received. Details may be described with reference to FIG.

  Reference is made to FIG. 2 showing a flowchart of a method 200 for performing fractional subframe transmission at a transmitter according to an embodiment of the present invention. Method 200 may be viewed as a specific implementation of method 100 described above with reference to FIG. 1 and may be performed by a transmitter. However, this is not intended to limit the scope, but only to illustrate the principles of the invention.

  Method 200 begins at step S210, where the symbol of the first subframe in which a channel is available is determined.

  According to embodiments of the present invention, whether a channel is available can be determined by several methods such as energy detection, carrier sensing, and the like. In some embodiments, energy strength from other transmitters can be measured in the channel. The other transmitter may be a transmitter that can use the same channel, unlike a transmitter that performs the method according to the embodiment of the present invention. If the energy intensity is not strong, the channel can be determined to be idle. In doing so, the energy intensity may be compared to an intensity threshold. In response to the measured intensity being less than the intensity threshold, it may be determined that the channel is available. The strength threshold may be a predetermined threshold, and may be set according to system requirements, specifications, channel quality, and the like. According to the embodiment of the present invention, the intensity threshold may be set as a fixed value or a value that is dynamically changed. The exemplary embodiments described above are not to be construed as limiting in any way the subject matter described herein, but are to be understood as illustrative only. The intensity threshold may be implemented in other suitable ways.

  Alternatively, channel availability may be detected based on carrier sensing. As an example, signals from other transmitters can be detected on the channel. The other transmitter may be a transmitter that can use the channel, unlike the transmitter that executes the method according to the embodiment of the present invention. Based on the signal, it may be determined whether the channel is available. When the transmitter detects that a channel becomes available for a symbol, the subframe comprising that symbol may be determined as the first subframe.

  In the above-described embodiment, one other transmitter has been described. However, the communication system according to the embodiment of the present invention may include a plurality of other transmitters. In such embodiments, energy detection and carrier sensing may be performed for multiple other transmitters.

  In step S220, it is determined that the first temporal information includes the potential position immediately before the symbol. Here, the potential position is predetermined in the first subframe.

  In an exemplary embodiment, if the symbol determined in step S210 is symbol 5 and there are three predetermined potential positions corresponding to symbols 0, 7, and 11, respectively, the transmitter Can determine that the potential position corresponding to symbol 0 is the potential position immediately before the current position. As such, in step S220, the first temporal information may include a potential position corresponding to symbol 0.

  Note that in some alternative embodiments, the first temporal information may be determined to include the index of the symbol determined in step S210. As an example, if the symbol determined in step S <b> 210 is symbol 5, the first temporal information may be determined to include the symbol 5 index. As will be appreciated by those skilled in the art, the first temporal information includes the index of the symbol determined in step S210, the potential position immediately before the symbol, or the symbol determined in step S210 and immediately before the symbol. It can contain any symbol between a potential position. The exemplary embodiments described above are not meant to be limiting in any way on the subject matter described herein, but are intended to be illustrative only.

  In step S230, the number of symbols used by the fractional subframe transmission is determined based on the transmission opportunity information.

  In some embodiments, the transmission opportunity information may include channel occupancy time. In the exemplary embodiment, the channel occupancy time may be, for example, 3.5 ms. For example, for a 1 ms subframe containing M symbols with M = 14, it may be determined that one symbol may occupy about 0.071 ms. Considering channel occupancy time and symbol length, by dividing the channel occupancy time by 0.071, the transmitter may determine that the number of symbols used by the fractional subframe transmission is 49.

  In step S240, the number of end symbols is determined based on the first temporal information and the number of symbols used by the fractional subframe transmission. Here, the end symbol is used by the fractional subframe transmission and belongs to the last subframe of the fractional subframe transmission.

ここで、Ｓ１は、ステップＳ２１０で判定されたシンボルの直前にあるポテンシャルポジションを示し、Ｓｅは、最後のシンボルのインデックスを示し、ＴＸＯＰは、チャネル占有時間（例えば、シンボルの数）を示す。 As described above, the first temporal information may include the potential position immediately before the symbol determined in step S210. In some embodiments, the last symbol of the fractional subframe transmission may be determined as follows.

Here, S1 indicates the potential position immediately before the symbol determined in step S210, Se indicates the index of the last symbol, and TXOP indicates the channel occupation time (for example, the number of symbols).

  In the exemplary embodiment, S1 is the first symbol of the first subframe (ie, symbol 0), and TXOP is 49 symbols. Thus, the last symbol can be determined as the 49th symbol of the fractional subframe transmission. If a subframe contains M symbols, for example M = 14, the fractional subframe transmission may be determined to occupy 4 subframes, where the first 3 subframes are fully occupied And the first seven symbols (symbols 0 to 6) of the last subframe are occupied. According to the embodiment of the present invention, the first seven symbols (symbols 0 to 6) of the last subframe may be determined as end symbols. Accordingly, in step S240, it can be determined that the number of end symbols is seven.

  In step S250, the transport block size is determined based on the number of end symbols.

The transport block size indicates the size of a data block transmitted by the fractional subframe transmission. According to embodiments of the present invention, the transport block size may be determined in various ways. In some embodiments, the end symbol of the last subframe may be considered an available symbol of the fractional subframe. The transmitter may determine a scaling factor associated with the number of available symbols, and then determine a transport block size based on the scaling factor. The scaling factor can be defined in several ways. Table 1 shows examples of scaling factors associated with various numbers of available symbols.

  In some embodiments, if the number of available symbols is 1, 2, or 3, the transmitter uses the available symbols to transmit control information for fractional subframe transmission. In addition, it may be determined that the available symbols are not sufficient to transmit data after transmitting the control information. In this case, the scaling factor may be designed as a value of “N / A”, indicating that the scaling factor is “not available”. In an exemplary embodiment, if the number of available symbols is 4, the transmitter may determine that the associated scaling factor is 0.25. In an exemplary embodiment, if the number of available symbols is 5, the transmitter may determine that the associated scaling factor is 0.25 or 0.375. In an exemplary embodiment, if the number of available symbols is 6, the transmitter may determine that the associated scaling factor is 0.375. In an exemplary embodiment, if the number of available symbols is 7, the transmitter may determine that the associated scaling factor is 0.375 or 0.5. In an exemplary embodiment, if the number of available symbols is 8, the transmitter may determine that the associated scaling factor is 0.5 or 0.75. In the exemplary embodiment, if the number of available symbols is 9, 10, 11, or 12, the transmitter may determine that the associated scaling factor is 0.75. In an exemplary embodiment, if the number of available symbols is 13 or 14, the transmitter may determine that the associated scaling factor is 1.

ここで、Ｎ’ＰＲＢは、第１のリソースブロック数を示し、ＮＰＲＢは、第２のリソースブロック数を示し、Ｆａｃｔｏｒは、スケーリングファクターを示す。 In some embodiments, the transport block size may be determined based on a scaling factor in several ways. As an example, a first resource block number indicating the number of resource blocks allocated for transmission may be obtained. For the transmitter, the first resource block number may be determined by the transmitter in real time. Thereafter, the second number of resource blocks may be determined based on the first number of resource blocks and the scaling factor. In the exemplary embodiment, the second number of resource blocks may be determined as follows.

Here, N′PRB indicates the first resource block number, NPRB indicates the second resource block number, and Factor indicates the scaling factor.

The transport block size may be determined based on the second resource block number. In some embodiments, a transport block size table may be used to determine the transport block size. Table 2 shows an exemplary transport block size table.

  The horizontal direction in Table 2 may correspond to the number of resource blocks, for example, the second number of resource blocks in the embodiment, and the vertical direction may correspond to Modulation and Coding Scheme (MCS). In the embodiment, when the transmitter determines not only the currently used MCS but also the second resource block number, the transport block size is determined by examining Table 2 based on the second resource block number and the MCS. Can be determined. As an example, if the second resource block number is 8 and the MCS is 8, the transport block size may be determined to be 1096.

  Note that the dimension of Table 2 is 10 × 27, which is a simplification of 3GPP TS 36.213, whose dimension is 34 × 110. Also, the above example tables are not meant to be limiting in any way on the subject matter described herein, but are merely illustrative. Any other suitable table may be used to determine the transport block size.

  In step S260, the transport block size data is transmitted in the last subframe.

  In some embodiments, the transmitter may send other possible information, such as, for example, Reference Signal (RS), Primary Synchronous Signal (PSS), Secondary Synchronous Signal (SSS), to the fractional subframe, if necessary. -You may transmit in the data area | region of a transmission, for example, Physical Downlink Shared Channel (PDSCH).

  Reference is made to FIG. 3 showing a flowchart of a method 300 for performing fractional subframe transmission at a receiver according to an embodiment of the present invention. Method 300 may be viewed as a specific implementation of method 100 described above with reference to FIG. 1 and may be performed by a receiver. However, this is not intended to limit the scope, but only to illustrate the principles of the invention.

  Method 300 begins at step S310, where the symbol of the first subframe in which a channel is available is determined.

  In some embodiments, the transmitter may inform the receiver of first temporal information that is, for example, the index of the symbol of the first subframe in which the channel becomes available. In an exemplary embodiment, the transmitter may transmit an indicator regarding the first temporal information to the receiver. In this method, the index of the symbol of the first subframe may be explicitly indicated. Thus, in step S310, the receiver may determine the symbol for the first subframe by detecting the indicator. In an alternative embodiment, the transmitter may not send an indicator and the receiver may perform blind decoding for the fractional subframe transmission control information at the potential position. In response to successful blind decoding, the receiver may determine the symbol of the first subframe in which the channel becomes available.

  In step S320, it is determined that the first temporal information includes the potential position immediately before the symbol. Here, the potential position is predetermined in the first subframe.

  In an exemplary embodiment, if the symbol determined in step S320 is symbol 5 and there are three predetermined potential positions corresponding to symbols 0, 7, and 11, respectively, the receiver Can determine that the potential position corresponding to symbol 0 is the potential position immediately before the current position. As such, in step S320, the first temporal information may include a potential position corresponding to symbol 0.

  Note that in some alternative embodiments, the first temporal information may be determined to include the index of the symbol determined in step S320. As an example, if the symbol determined in step S320 is symbol 5, the first temporal information may be determined to include the index of symbol 5. As will be appreciated by those skilled in the art, the first temporal information is the index of the symbol determined in step S320, the potential position immediately before the symbol, or the symbol determined in step S320 and immediately before the symbol. It can contain any symbol between a potential position. The exemplary embodiments described above are not meant to be limiting in any way on the subject matter described herein, but are intended to be illustrative only.

  In step S330, the number of symbols used by the fractional subframe transmission is determined based on the transmission opportunity information.

  In some embodiments, the transmission opportunity information may include channel occupancy time. In the exemplary embodiment, the channel occupancy time may be, for example, 3.5 ms. For example, for a 1 ms subframe containing M symbols with M = 14, it may be determined that one symbol may occupy about 0.071 ms. Considering the channel occupancy time and symbol length, by dividing the channel occupancy time by 0.071, the receiver may determine that the number of symbols used by the fractional subframe transmission is 49.

  In step S340, the number of end symbols is determined based on the first temporal information and the number of symbols used by the fractional subframe transmission. Here, the end symbol is used by the fractional subframe transmission and belongs to the last subframe of the fractional subframe transmission.

  As described above, the first temporal information may include the potential position immediately before the symbol determined in step S310. In some embodiments, the receiver may determine the last symbol of the fractional subframe transmission, eg, according to equation (3).

  In step S350, the transport block size is determined based on the number of end symbols.

  The transport block size indicates the size of a data block transmitted by the fractional subframe transmission. According to embodiments of the present invention, the transport block size may be determined in various ways. In some embodiments, the end symbol of the last subframe may be considered an available symbol of the fractional subframe. The receiver may determine a scaling factor that is associated with the number of available symbols and then determine a transport block size based on the scaling factor. The scaling factor can be defined in several ways. As explained above, Table 1 shows examples of scaling factors associated with various numbers of available symbols.

  In the exemplary embodiment, if the number of available symbols is 4, the receiver may determine that the associated scaling factor is 0.25. In an exemplary embodiment, if the number of available symbols is 5, the receiver may determine that the associated scaling factor is 0.25 or 0.375. In the exemplary embodiment, if the number of available symbols is 6, the receiver may determine that the associated scaling factor is 0.375. In an exemplary embodiment, if the number of available symbols is 7, the receiver may determine that the associated scaling factor is 0.375 or 0.5. In the exemplary embodiment, if the number of available symbols is 8, the receiver may determine that the associated scaling factor is 0.5 or 0.75. In the exemplary embodiment, if the number of available symbols is 9, 10, 11, or 12, the receiver may determine that the associated scaling factor is 0.75. In an exemplary embodiment, if the number of available symbols is 13 or 14, the receiver may determine that the associated scaling factor is 1.

  In some embodiments, the transport block size may be determined based on a scaling factor in several ways. As an example, a first resource block number indicating the number of resource blocks allocated for transmission may be obtained. For the receiver, the first resource block number may be notified by the transmitter. Thereafter, the second number of resource blocks may be determined based on the first number of resource blocks and the scaling factor. In the exemplary embodiment, the second number of resource blocks may be determined according to equation (4). The transport block size may be determined based on the second resource block number. In some embodiments, for example, the transport block size table of Table 2 may be used to determine the transport block size. Specifically, when the receiver determines not only the currently used MCS but also the second number of resource blocks, the transport block size can be determined by examining Table 2.

  In step S360, the transport block size data is received in the last subframe.

  In some embodiments, the receiver can send other possible information, such as, for example, Reference Signal (RS), Primary Synchronous Signal (PSS), Secondary Synchronous Signal (SSS), to the fractional subframe, if necessary. -You may receive in the data area | region of a transmission, for example, Physical Downlink Shared Channel (PDSCH).

  FIG. 4 shows a schematic diagram 400 of a fractional subframe transmission according to an embodiment of the present invention. FIG. 4 illustrates four subframes from subframes 0 to 3. There are three potential positions 421, 422, and 423 for subframe 0, with the first potential position 421 corresponding to the start of subframe 0, eg, symbol 0 of subframe 0. The CCA / eCCA 401 may start from the initial potential position 421. During CCA / eCCA 401, the transmitter may determine that a channel is available at position 424. Since position 424 is not a potential position, the transmitter can transmit a channel occupancy signal from position 424 to a potential position, for example, potential position 422, and can determine potential position 422 as a target position. As a result, the fractional subframe transmission can start from the target position, where control information can be transmitted on the Physical Downlink Control Channel (PDCCH) in the time periods 403, 405, 407, and 409, and the data is PDSCH can be transmitted in time periods 404, 406, 408, and 410. As shown, the fractional subframe transmission ends at position 425.

  As shown in FIG. 4, the symbol of the first subframe where the channel becomes available may be determined as the symbol corresponding to position 424. Since the potential position immediately before the determined symbol is the potential position 421, the channel occupation time can be determined to start at the potential position 421. Assuming that the transmission opportunity information includes a 3.5 ms TXOP, the number of symbols used by the fractional subframe transmission may be determined to be 49. As shown in FIG. 5, TXOP corresponds to the time period from position 421 to position 425, and the actual channel occupation time is from position 424 to position 425. Therefore, the time period from the position 421 to the position 424 is not occupied. Then, based on the potential position 421 and the number of symbols used by the fractional subframe transmission, the end symbol can be determined as the first seven symbols of subframe 3, and the number of end symbols is seven. is there. In this method, the end of the fractional subframe transmission can be estimated.

  According to an embodiment of the invention, optionally, the method 200 or 300 may further comprise the step of comparing the number of ending symbols with a predetermined threshold. The last subframe may be released in response to the number of end symbols being less than or equal to a predetermined threshold. In an alternative embodiment, in response to the number of end symbols being less than or equal to a predetermined threshold, the end symbols may be combined as a super subframe in the subframe immediately preceding the last subframe. A super subframe is illustrated in FIG. 5, which shows a schematic diagram 500 of a fractional subframe transmission according to an embodiment of the present invention. As shown in FIG. 5, there are four subframes from subframes 0 to 3. Since the number of end symbols in the last subframe (subframe 3) is less than a predetermined threshold, eg, 3, the end symbols can be combined into subframe 2 as a super subframe. As shown, the super subframe may correspond to the time period from the start 501 of subframe 2 to the last of the end symbols 502.

  FIG. 7 shows a block diagram of a transmitter apparatus 710 and a receiver apparatus 720 that perform fractional subframe transmission according to an embodiment of the present invention. As shown in FIG. 7, device 710 may transmit fractional subframe data to device 720. According to embodiments of the present invention, device 710 may be implemented by a transmitter or may be associated with a transmitter in any suitable manner. Similarly, device 720 may be implemented by a receiver or may be associated with the receiver in any suitable manner.

  As shown, the apparatus 710 includes a first determination unit 711 for determining first temporal information indicating when a channel becomes available, and based on the first temporal information and transmission opportunity information, A second determination unit 712 that determines second temporal information indicating the end of the subframe transmission.

  According to the embodiment of the present invention, the first determination unit 711 includes a first symbol determination unit that determines a symbol of the first subframe in which a channel is available, and the first temporal information is a symbol. A first information determination unit that determines that an index is included.

  According to the embodiment of the present invention, the first determination unit 711 includes a second symbol determination unit that determines a symbol of the first subframe in which a channel is available, and the first temporal information is a symbol. And a second information determination unit that determines that the immediately preceding potential position is included. Here, the potential position is predetermined in the first subframe.

  According to the embodiment of the present invention, the second determination unit 712 includes a first number determination unit that determines the number of symbols used by the fractional subframe transmission based on the transmission opportunity information, And a second number determination unit that determines the number of end symbols based on the temporal information of 1 and the number of symbols used by the fractional subframe transmission. Here, the end symbol is used by the fractional subframe transmission and belongs to the last subframe of the fractional subframe transmission.

  According to the embodiment of the present invention, the apparatus 710 compares the number of end symbols with a predetermined threshold, and determines the last subframe in response to the number of end symbols being equal to or less than the predetermined threshold. And a processing unit that releases or combines the end symbol with the subframe immediately preceding the last subframe.

  According to the embodiment of the present invention, apparatus 710 transmits a first size determination unit that determines a transport block size based on the number of end symbols, and data of a transport block size of the last subframe. And a transmission unit.

  According to the embodiment of the present invention, the first determination unit 711 includes a first subframe determination unit that determines a first subframe in which a channel becomes available, and a first temporal information is a first subframe. A third information determination unit that determines that the index is included.

  According to the embodiment of the present invention, the second determination unit 712 determines the index of the last subframe used by the fractional subframe transmission based on the first temporal information and transmission opportunity information. The last subframe determination unit may be provided.

  As shown, the device 720 includes a first determiner 721 that determines first temporal information indicating when the channel becomes available, and based on the first temporal information and the transmission opportunity information, A second determination unit 722 that determines second temporal information indicating the end of the subframe transmission.

  According to the embodiment of the present invention, the first determination unit 721 includes a first symbol determination unit that determines a symbol of the first subframe in which a channel is available, and the first temporal information is a symbol. A first information determination unit that determines that an index is included.

  According to the embodiment of the present invention, the first determination unit 721 includes a second symbol determination unit that determines a symbol of the first subframe in which a channel is available, and the first temporal information is a symbol. And a second information determination unit that determines that the immediately preceding potential position is included. Here, the potential position is predetermined in the first subframe.

  According to the embodiment of the present invention, the second determination unit 722 includes a first number determination unit that determines the number of symbols used by the fractional subframe transmission based on the transmission opportunity information, And a second number determination unit that determines the number of end symbols based on the temporal information of 1 and the number of symbols used by the fractional subframe transmission. Here, the end symbol is used by the fractional subframe transmission and belongs to the last subframe of the fractional subframe transmission.

  According to the embodiment of the present invention, the apparatus 720 compares the number of end symbols with a predetermined threshold value, and determines the last subframe in response to the number of end symbols being equal to or less than the predetermined threshold value. And a processing unit that releases or combines the end symbol with the subframe immediately preceding the last subframe.

  According to the embodiment of the present invention, the apparatus 720 receives a first size determination unit that determines a transport block size based on the number of end symbols, and data of a transport block size of the last subframe. And a receiving unit.

  According to the embodiment of the present invention, the first determination unit 721 includes an initial subframe determination unit that determines an initial subframe in which a channel can be used, and the first temporal information is an initial subframe. A third information determination unit that determines that the index is included.

  According to the embodiment of the present invention, the second determination unit 722 determines the index of the last subframe used by the fractional subframe transmission based on the first temporal information and transmission opportunity information. The last subframe determination unit may be provided.

  It should be noted that the devices 710 and 720 may each be realized by any suitable technology currently known or developed in the future. In addition, the single device shown in FIG. 7 may instead be realized by being separated into a plurality of devices, and the plurality of separated devices may be realized by a single device. The scope of the present invention is not limited in these respects.

  The device 710 may be configured to realize the function described with reference to FIGS. 1 and 2, and the device 720 may realize the function described with reference to FIG. 1 or FIG. 3. It may be configured. Accordingly, features described for method 100 or 200 may apply to corresponding components of apparatus 710 and features described for method 100 or 300 may apply to corresponding components of apparatus 720. Also, the components of device 710 or device 720 may be embodied by hardware, software, firmware, and / or any combination thereof. For example, the apparatus 710 or the components of the apparatus 720 may each be implemented by a circuit, a processor, or any other suitable device. Those skilled in the art will appreciate that the foregoing example is not meant to be limiting, but is for illustration only.

  In some embodiments of the present disclosure, device 710 or device 720 may comprise at least one processor. At least one processor suitable for use in embodiments of the present disclosure may include, by way of example, both general-purpose and special-purpose processors that are already known or that will be developed in the future. The device 710 or the device 720 may further include at least one memory. The at least one memory may include, for example, semiconductor memory devices such as RAM, ROM, EPROM, and flash memory devices. At least one memory may be used to store a program of computer-executable instructions. The program may be written in any high level and / or low level compliable or interpretable programming language. According to an embodiment, the computer-executable instructions cause at least one processor to cause device 710 to execute at least according to method 100 or 200, as described above, or to cause device 720 to method as described above. It may be configured to run at least according to 100 or 300.

  Based on the foregoing description, those skilled in the art will appreciate that the present disclosure may be embodied in an apparatus, method, or computer program product. In general, the various exemplary embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. For example, the present disclosure is not limited thereto, but some aspects may be implemented in hardware, while other aspects may be performed by a firmware, or a controller, microprocessor, or other computing device It may be realized by software. Although various aspects of exemplary embodiments of the present disclosure may be shown and described using block diagrams, flowcharts, or other graphical descriptions, these blocks, apparatuses, and systems described herein. , Techniques, or methods are not limited to examples, and may be implemented by hardware, software, firmware, dedicated circuitry or logic, general purpose hardware or controllers or other computing devices, or any combination thereof Is understood.

  The various blocks shown in FIGS. 1-3 are regarded as a plurality of combinatorial logic elements configured to perform operations and / or related functions resulting from the processing of method steps and / or computer program code. obtain. At least some aspects of the exemplary embodiments of the present disclosure may be implemented in various components such as, for example, integrated circuit chips and modules, and the exemplary embodiments of the present disclosure It may be implemented with an apparatus embodied as an integrated circuit, FPGA or ASIC operating according to an exemplary embodiment.

  This specification contains many specific implementation details, but these should not be construed as limitations on any disclosure or claim that may be made, and clarify specific embodiments of a particular disclosure. It should be construed as an explanation of the characteristics obtained. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination of single embodiments. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments or in other suitable subcombinations. Further, while features are described above to work in certain combinations and even those originally claimed as such, one or more features in the claimed combinations may optionally be deleted from the combination. And the claimed combination may be directed to sub-combinations or variations of sub-combinations.

  Similarly, operations are shown in the figures in a particular order, but such actions are performed in the particular order shown or in sequential order to achieve the desired result, or It should not be understood that all of the operations shown are performed. In certain situations, multitasking and parallel processing may be advantageous. Further, the separation of various system components in the embodiments described above should not be understood as requiring such separation in all embodiments, and the described program components and systems generally It should be understood that they can be integrated together into a single software product or packaged into multiple software products.

  Various modifications and adaptations of the present disclosure to the above-described exemplary embodiments will become apparent to those skilled in the art in view of the above description when read in conjunction with the accompanying drawings. Any and all modifications are included within the scope of the present disclosure and the non-limiting scope and exemplary embodiments. Furthermore, other embodiments of the disclosure described herein will remind those skilled in the art that these embodiments of the present disclosure have the advantages of the teachings presented in the foregoing description and the associated drawings.

  Accordingly, the embodiments of the present disclosure are not limited to the specific embodiments described, and modifications and other embodiments are included within the scope of the appended claims. It needs to be understood as intended. Although specific terms are used herein, they are not intended to be limiting and are used in a general and descriptive sense only.

Claims (10)

Comprises a first information indicating a sub-frame arrangement, and detecting message sent by the first subframe from the base fabric station,
The number of symbols occupied for transmission of downlink information based on the subframe arrangement, starting from symbol 0 in a second subframe different from the first subframe Assuming a number of symbols,
A method performed by a user device comprising: The transmission of the downlink information ends with the plurality of symbols starting from the symbol 0 in the second subframe;
The method of claim 1. Possible start positions for the transmission of the downlink information are subframe boundaries and slot boundaries,
The method according to claim 1 or 2. The number of occupied symbols starting from the symbol 0 in the second subframe for the transmission of the downlink information is 3, 6, 9, 10 or 11;
4. A method according to any one of claims 1 to 3. The transmission of the downlink information occupies one or more consecutive subframes;
5. A method according to any one of claims 1 to 4. Transmitting a message including first information indicating a subframe arranged at a first sub-frame to the user equipment,
With
The number of symbols occupied for transmission of downlink information based on the subframe arrangement, starting from symbol 0 in a second subframe different from the first subframe the number of the symbols is temporarily fixed by the user equipment,
The method performed by the base station. The transmission of the downlink information ends with the plurality of symbols starting from the symbol 0 in the second subframe;
The method of claim 6. Possible start positions for the transmission of the downlink information are subframe boundaries and slot boundaries,
The method according to claim 6 or 7. The number of occupied symbols starting from the symbol 0 in the second subframe for the transmission of the downlink information is 3, 6, 9, 10 or 11;
9. A method according to any one of claims 6 to 8. The transmission of the downlink information occupies one or more consecutive subframes;
10. A method according to any one of claims 6-9.

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