JP7439864B2 - Base station, user equipment, method performed by base station, and method performed by user equipment - Google Patents

Description

Embodiments of the present invention generally relate to communication technology. More particularly, embodiments of the invention relate to methods and apparatus for implementing fractional subframe transmission.

In the 3rd Generation Partnership Project (3GPP), various network configurations and various This technology is called interworking WLAN. Multimode wireless communication technology is evolving to use multiple wireless communication technologies at the same time. Using multiple wireless communication technologies simultaneously thereby increases the transfer rate per unit time or improves the reliability of the terminal.

In wireless communications, spectrum is an extremely scarce resource. A licensed band represents a frequency band that is exclusively licensed to a specific operator to provide a specific wireless service. On the other hand, an unlicensed band represents a frequency band that is not allocated to a specific operator, but is open so that all entities that meet predetermined requirements can use the frequency band.

In some regions of the world, unlicensed band technologies need to comply with certain regulations and channel bandwidth occupancy requirements, such as Listen-Before-Talk (LBT). LBT introduces uncertainty in channel availability. For example, unlicensed bands may be used at any time within a subframe.

WLAN, which utilizes Wireless Fidelity (WiFi), is a typical wireless communication technology used in unlicensed bands. The current Long Term Evolution (LTE) time accuracy is much greater than that of WiFi, which makes License Assisted Access (LAA) with LBT less competitive. In this way, fair coexistence between LTE and other technologies such as WiFi is expected, as well as between LTE operators.

In unlicensed bands, to further compete, it is necessary to implement fractional subframe transmission with low signaling overhead and high resource utilization.

The present invention proposes a solution for fractional subframe transmission. Specifically, the present invention provides a method and apparatus for fractional subframe transmission with low signaling overhead and high resource utilization.

According to a first aspect of an embodiment of the invention, an embodiment of the invention provides a method of implementing fractional subframe transmission. The method includes, in response to detecting channel availability, determining a target position from at least one predetermined potential position in a subframe and performing fractional subframe transmission from the target position. , may also be included. This method may be implemented at the transmitter.

According to a second aspect of embodiments of the invention, embodiments of the invention provide a method of implementing fractional subframe transmission. The method includes determining a target position from at least one predetermined potential position in a subframe, and initiating a fractional subframe transmission at the target position and receiving a fractional subframe transmission from the target position. But it's okay. This method may be implemented at the receiver.

According to a third aspect of an embodiment of the invention, an embodiment of the invention provides an apparatus for implementing fractional subframe transmission. The apparatus includes: a first determining unit that determines a target position from at least one predetermined potential position in a subframe in response to detecting that a channel becomes available; and a first determining unit configured to transmit a fractional subframe from the target position. It may also include an implementation section for implementing. This device may be implemented with a transmitter.

According to a fourth aspect of an embodiment of the invention, an embodiment of the invention provides an apparatus for implementing fractional subframe transmission. The apparatus may include a second determining unit that determines a target position from at least one predetermined potential position in a subframe, and a receiving unit that receives fractional subframe transmission from the target position. This device may be implemented in a receiver.

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

Embodiments of the invention are presented in an exemplary sense and their advantages will be explained in more detail hereinafter with reference to the accompanying drawings.

1 depicts a flowchart of a method 100 for implementing fractional subframe transmission in a transmitter according to an embodiment of the invention.

2 depicts a flowchart of a method 200 for implementing fractional subframe transmission in a transmitter according to another embodiment of the invention.

3 depicts a flowchart of a method 300 for implementing fractional subframe transmission in a receiver according to an embodiment of the invention.

4 depicts a flowchart of a method 400 for implementing fractional subframe transmission in a receiver according to another embodiment of the invention.

5 depicts a schematic diagram 500 of fractional subframe transmission according to an embodiment of the invention.

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

FIG. 7 depicts a block diagram of an apparatus 700 implementing fractional subframe transmission according to an embodiment of the invention.

FIG. 8 depicts a block diagram of an apparatus 800 implementing fractional subframe transmission according to an embodiment of the invention.

The same or similar reference numbers indicate the same or similar elements throughout the drawings.

The subject matter described herein is described herein with reference to several exemplary embodiments. These embodiments are described solely to enable those skilled in the art to better understand and implement the subject matter described herein, rather than intended as any limitation on the scope of the subject matter. It should be understood that there are

The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limited to the exemplary embodiments. As used herein, the singular form is intended to include the plural form as well, unless the context clearly dictates otherwise. Additionally, the terms "comprising," "comprising," "includes," and/or "including" as used herein refer to the described features, integers, steps, acts, elements, and/or Alternatively, it will be understood that identifying the presence of a component does not exclude the presence or addition of one or more other features, integers, steps, acts, elements, and/or groupings.

It should also be noted that in some alternative embodiments, the mentioned features/acts are not limited to the order mentioned in the figures. For example, two functions or acts that are illustrated in succession may actually be performed simultaneously, or sometimes in the reverse order, depending on the functions/acts involved.

Embodiments of the present invention are directed to a solution for performing fractional subframe transmission. This solution may be implemented between the receiver and the transmitter. Specifically, upon detecting that a channel becomes available, the transmitter determines a target position from at least one predetermined potential position in a subframe, and Fractional subframe transmission may be performed from the position. The receiver may similarly determine a target position from the at least one predetermined potential position and receive fractional subframe transmissions from the target position. In this way, transmission may be performed without introducing signaling overhead. On the other hand, once the channel enters the idle state, transmission may start from the current subframe instead of the next subframe. In this way, resource utilization is improved.

In embodiments of the invention, a fractional subframe may refer to a subframe for downlink transmission or a subframe for uplink transmission, and a part of the fractional subframe is used for transmitting control information. , the other parts are not used for transmission. For example, for a downlink subframe consisting of 14 symbols, if only the last 6 symbols are available for downlink transmission and the first 8 symbols are not available, this subframe is considered a fractional subframe. Also good.

In this disclosure, fractional subframe transmission may refer to transmission performed in one or more subframes, where at least one of the one or more subframes is a fractional subframe. As an example, fractional subframe transmission may be performed when the first subframe is a fractional subframe, when the last subframe is a fractional subframe, when the first and last subframes are fractional subframes, etc. It may include cases where

In some embodiments, fractional subframe transmissions may be downlink or uplink cellular transmissions. For downlink transmission, the receiver can be a terminal, Mobile Terminal (MT), Subscriber Station (SS), Portable Subscriber Station (PSS), Mobile Station It may also include user equipment (UE) such as an Access Terminal (MS) or an Access Terminal (AT). On the other hand, the transmitter may include a base station (BS), such as a node B (NodeB or NB) or an evolved NodeB (eNodeB or eNB). . For uplink transmissions, the transmitter may include a UE and the receiver may include a BS.

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

Embodiments of the present invention may be applied in a variety of communication systems, but are limited to Long Term Evolution (LTE) systems or Long Term Evolution Advanced (LTE-A) systems. It is not something that will be done. Given the rapid development of communications, it will be appreciated that the present invention may be embodied in future wireless communications technologies or systems. The scope of the invention should not be considered limited to only the systems described above.

Some exemplary embodiments of the invention will now be described with reference to the drawings. Reference is first made to FIG. 1, which is a flowchart of a method 100 for implementing fractional subframe transmission in a transmitter according to an embodiment of the invention. Method 100 may be implemented at a transmitter such as a BS, a D2D transmitter, and other suitable devices.

The method 100 begins in step S110, where in response to detecting channel availability, a target position is determined from at least one predetermined potential position in a subframe.

According to embodiments of the present invention, a subframe may be composed of multiple symbols. As an example, a subframe may be 1 ms, and may be composed of 14 symbols, such as symbol 0 to symbol 13, for example. A position, such as potential position, target position, current position, next position, refers to a time point or time period in a subframe. Also good. In some embodiments, a position may correspond to an instant in a subframe. Alternatively, the position may correspond to a subframe symbol. In this regard, a position may occupy a period of time, such as the period of a symbol, for example. In context, a target position may refer to a position where fractional transmission is initiated, and a potential position may refer to a predetermined position that is a candidate for a target position.

ここで、Ｎは、サブフレームにおけるシンボルのインデックスを表し、Ｎｄは２つのポテンシャルポジションの間の周期を表し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である整数の表す。式（１）によれば、小さいＮｄは、ポテンシャルポジションが高密度であると決定されても良い。いくつかの実施形態では、サブフレームにおける各シンボルはポテンシャルポジションとして事前に定義されても良い。 According to embodiments of the invention, there may be one or more predetermined potential positions in a subframe. Each of the potential positions may correspond to a subframe symbol periodically or non-periodically. In some embodiments, potential positions may be configured every third symbol, such as symbols 0, 3, 6, 9, and 12, for example. For example, the potential position may be set as follows.

Here, N represents the index of the symbol in the subframe and Nd represents the period between two potential positions and is an integer ranging from 1 to the total number of symbols in the subframe, such as 14. According to equation (1), a small Nd may be determined to have a high density of potential positions. In some embodiments, each symbol in a subframe may be predefined as a potential position.

It should be noted that the above examples are provided by way of example rather than limitation. It can be appreciated that in alternative embodiments, there may be a non-periodic configuration of potential positions. For example, the potential positions may correspond to symbols 0, 3, 8, and 12.

According to embodiments of the invention, a Clear Channel Assessment (CCA) or an Extended Clear Channel Assessment (eCCA) may be performed. With CCA/eCCA, the transmitter may detect whether a channel is available. In response to detecting that a channel is available, the transmitter may determine the target position from one or more potential positions in several ways. In some embodiments, it is first detected whether the current position is a potential position. When the current position is a potential position, the potential position may be determined as the target position. Otherwise, the channel occupancy signal may be transmitted from the current position to the potential position, and the potential position may be determined as the target position.

In step S120, fractional subframe transmission is performed from the target position.

According to embodiments of the invention, in step S120, the transmitter may transmit an indicator to the receiver at the target position. The indicator may indicate the size of control information for fractional subframe transmission, such as the number of symbols of a Physical Downlink Control Channel (PDCCH), for example. In some embodiments, the indicator may be implemented as a Physical Control Format Indicator Channel (PCFICH) or other suitable indicator. Upon receiving the indicator, the receiver may know the magnitude of the control information. For example, when a receiver detects a PCFICH, it may know the number of symbols on the PDCCH. It should be noted that the above examples are in no way suggested to limit the scope of the subject matter described herein, and are presented for illustrative purposes only. As can be appreciated, in some embodiments, the control information may be configured by higher layer signals or by specifications.

According to embodiments of the present invention, in step S120, the transmitter may determine the number of available symbols in a subframe based on the target position, and perform fractional subframe transmission from the target position based on the number of available symbols. Control information and data may also be transmitted. In some embodiments, control information may be sent on a PDCCH and data may be sent on a Physical Downlink Shared Channel (PDSCH). Details of the embodiment are explained with reference to FIG.

According to embodiments of the present invention, the scheduling information associated with each potential position may be preset in advance. When performing fractional subframe transmission, the transmitter may obtain preconfigured scheduling information related to the target position, or perform fractional subframe transmission based on the preconfigured scheduling information. good. Thus, when determining a target position, the transmitter does not have to spend much time configuring scheduling information related to the target position. In this way, fractional subframe transmission may be performed more quickly and efficiently.

FIG. 5 shows a schematic diagram 500 of fractional subframe transmission according to an embodiment of the invention. FIG. 5 exemplarily represents four subframes, subframes 0 to 3. For subframe 0, there are three potential positions 521, 522 and 523, the first potential position 521 corresponding to the start of subframe 0, eg symbol 0 of subframe 0. CCA/eCCA 501 may start from a first potential position 521. During CCA/eCCA 501, the transmitter may determine that a channel is available at location 524. Since position 524 is not a potential position, the transmitter may transmit a channel occupancy signal from position 524 to a potential position, such as potential position 522, and may determine potential position 522 as a target position. Fractional subframe transmission may then begin from the target position, control information may be transmitted on the PDCCH in periods 503, 505, 507, and 509, and data may be transmitted on the PDSCH in periods 504, 506, 508, and 510. May be sent.

Reference is now made to FIG. 2, which shows a flowchart of a method 200 for implementing fractional subframe transmission in a transmitter according to another embodiment of the invention. Method 200 may be considered a particular implementation of method 100 described above with reference to FIG. However, it should be noted that this is only for the purpose of illustrating the principles of the invention rather than limiting its scope.

The method 200 begins in step S210, where a channel is detected as becoming available.

According to embodiments of the invention, channel availability may be detected by several methods, such as energy detection, carrier sensing, etc. In some embodiments, the strength of energy from other transmitters may be measured on the channel. The other transmitter may be a transmitter that uses the same channel or may be different from the transmitter implementing the method according to the embodiment of the present invention. If the energy intensity is not strong, the channel may be determined to be idle. In this regard, the energy intensity may be compared to an intensity threshold. A channel may be determined to be available in response to the measured intensity being less than an intensity threshold. The intensity threshold may be a predetermined threshold set according to system requirements, specifications, channel quality, etc. According to embodiments of the invention, the intensity threshold may be set as a fixed value or a dynamically changing value. It is to be understood that the above exemplary embodiments are not intended to suggest any limitation of the subject matter described herein and are for illustrative purposes only. Intensity thresholds may be implemented in other suitable ways.

Alternatively, channel availability may be detected based on carrier sensing. As an example, signals from other transmitters may be detected by the channel. The other transmitter may be a transmitter using that channel and may be different from the transmitter implementing the method according to the embodiments of the invention. Whether a channel is available may be determined based on the signal.

Although the above embodiment describes one other transmitter, it should be noted that multiple other transmitters may be present in a communication system according to embodiments of the invention. In such embodiments, energy detection and carrier sensing may be performed for multiple other transmitters.

In step S220, it is detected whether the current position is a potential position.

If the current position is a potential position, the flow advances to step S240, where the potential position is determined as the target position. If the current position is not a potential position, the flow proceeds to step S230, and the channel occupancy signal is transmitted from the current position to the potential position. The flow then proceeds to step S240, where the potential position is determined as the target position.

In step S250, the number of available symbols in the subframe is determined based on the target position.

In some embodiments, the number of available symbols may be determined based on the target position and the total number of symbols in the subframe. As an example, if there are 14 symbols in one subframe and the target position corresponds to the 6th symbol, symbol 5, it may be determined that there are 8 available symbols, symbols 6 to 13. As another example, if there are 12 symbols in one subframe and the target position corresponds to the 8th symbol, i.e., symbol 7, it may be determined that there are 4 available symbols, i.e., symbols 8 to 11. good.

In step S260, control information and/or data for fractional subframe transmission is transmitted from the target position based on the number of available symbols.

In some embodiments, if a channel is available in early symbols, e.g. symbols 0 to 6, normal control information may be applied, e.g. a normal PDCCH. If a channel is available in slower symbols, eg symbols 9 to 13, shortened control information, eg shortened PDCCH, may be applied. In an exemplary embodiment, a regular PDCCH may occupy 3 symbols and a shortened PDCCH may occupy 1 or 2 symbols.

Further, in some embodiments, in response to the number of available symbols being less than or equal to a predetermined threshold, the transmitter transmits control information and data in the available symbols of this subframe and the immediately following subframe. You may do so. In an exemplary embodiment, if the number of available symbols is equal to the control information size, the transmitter may transmit control information in the available symbols of this subframe and transmit data in the immediately following subframe. You may do so. In a further exemplary embodiment, if the number of available symbols is smaller than the size of the control information, the transmitter transmits the first part of the control information in the available symbols of this subframe and the further subframe immediately thereafter. A second part of the control information may be transmitted in the frame, the first part and the second part forming the control information. After the control information is transmitted, the transmitter may transmit data in further subframes. According to embodiments of the present invention, the predetermined threshold value may be set as a fixed value or a dynamically changed value, may be configured by an upper layer signal, or may be defined by a specification. In an exemplary embodiment, the predetermined threshold may be set to three.

FIG. 6 shows a schematic diagram 600 of fractional subframe transmission according to an embodiment of the invention. FIG. 6 exemplarily shows four subframes, subframes 0 to 3. For subframe 0, there are two potential positions 621 and 622. CCA/eCCA 601 may start from first potential position 621. During CCA/eCCA 601, the transmitter may determine that a channel is available at potential position 622. In this way, potential position 622 may be determined as a target position. Fractional subframe transmission may then start from the target position, control information may be transmitted on the PDCCH in periods 602, 603, and 605, and data may be transmitted on the PDSCH in periods 604 and 606. As shown in FIG. 6, control information is transmitted in the available symbols of subframe 0 and in the next subframe 1, corresponding to periods 602 and 603, respectively. After the control information, data is transmitted in period 604. Specifically, a first portion of control information is transmitted in period 602 and a second portion of control information is transmitted in period 603.

Note that fractional subframe transmission may end with a portion of a subframe or a complete subframe. According to the embodiment shown in FIG. 5, the fractional subframe transmission ends at position 525. In this way, a portion of subframe 3 is used in fractional subframe transmission. In this case, both the first subframe (ie, subframe 0) and the last subframe (ie, subframe 3) are fractional subframes. Alternatively, the fractional subframe transmission ends at the end of subframe 2, as shown in FIG. In other words, fractional subframe transmission ends with a complete subframe.

Further, in some embodiments, the transport block size in a fractional subframe may be determined based on the number of available symbols, and the transport block size data may be transmitted in the subframe.

The transport block size indicates the size of a data block transmitted in fractional subframe transmission. According to embodiments of the invention, the transport block size may be determined by various methods. In some embodiments, the transmitter may determine a scaling factor related to the number of available symbols and may determine the transport block size based on the scaling factor. The scaling factor may be defined in several ways. Table 1 represents examples of scaling factors associated with different numbers of available symbols.

In some embodiments, if the number of available symbols is 1, 2, or 3, the transmitter may use the available symbols to transmit control information for fractional subframe transmission; After sending the control information, it may be determined that there is not enough to send data. In this regard, 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 between 0.25 and 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 to 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 to 0.75. In an 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番号を表し、Ｎ_ＰＲＢは第２のリソースブロック番号を表し、Ｆａｃｔｏｒはスケーリングファクターを表す。 In some embodiments, the transport block size may be determined based on the 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. Then, the second resource block number may be determined based on the first resource block number and the scaling factor. In an exemplary embodiment, the second resource block number may be determined as follows.

Here, N' _PRB represents the first resource block number, N _PRB represents the second resource block number, and Factor represents 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 is used to determine transport block sizes. Table 2 represents an exemplary transport block size table.

The horizontal direction of Table 2 corresponds to resource block numbers, such as the second resource block number in the embodiment, and the vertical direction corresponds to modulation and coding schemes (MCS). In an embodiment, when determining the second resource block number as well as the MCS currently adopted by the transmitter, the transport block size is determined by referring to Table 2 based on the second resource block number and the MCS. It's okay to be. As an example, if the second resource block number is 8 and the MCS is 8, the transport block size may be determined as 1096.

Note that although the size of Table 2 is 10x27, Table 2 is a simplification of 3GPP TS36.213, whose size is 34x110. Furthermore, it is noted that the above example table is for illustrative purposes only and is not intended to suggest any limitation on the subject matter described herein. Other suitable tables may be used in determining transport block size.

Reference is now made to FIG. 3, which shows a flowchart of a method 300 for implementing fractional subframe transmission in a receiver according to an embodiment of the invention. Method 300 may be implemented at a receiver such as a UE, a D2D receiver, and other suitable devices.

In step S310, a target position is determined from at least one predetermined potential position in the subframe, and fractional subframe transmission is started at the target position.

According to embodiments of the invention, there may be at least one predetermined potential position in a subframe. In some embodiments, the plurality of potential positions may correspond periodically to symbols of a subframe, eg, according to equation (1). Alternatively, there may be an aperiodic configuration of potential positions. For example, potential positions may correspond to symbols 3, 8, and 12.

The target position indicates when fractional subframe transmission will begin. There may be several ways for the receiver to determine the target position based on one or more predetermined potential positions in the subframe. In some embodiments, the transmitter may send an indicator to the receiver at the target position, eg, the indicator, such as PCFICH, may indicate the magnitude of the control signal for fractional subframe transmission. In this way, the target position may be explicitly indicated. For the receiver, the receiver may detect the indicator at one of the at least one potential position, for example designated as potential position 1. In response to the indicator being detected, the receiver may determine one of the at least one potential position as a target position. On the other hand, the receiver may decide that this potential position is not the target position and may perform the same detection at further potential positions, such as potential position 2, for example.

Alternatively, in some embodiments, the transmitter may not transmit the indicator. In this case, the receiver may perform blind coding on the control signal for fractional subframe transmission at one of the at least one potential position. In response to successful blind coding, the receiver may determine one of the at least one potential position as a target position.

At step S320, a fractional subframe transmission is received from the target position.

In some embodiments, the receiver may know the magnitude of the control information based on the indicator of the magnitude of the control information of the fractional subframe transmission and accordingly receive the control information from the target position. It's okay.

According to embodiments of the present invention, the number of available symbols in a subframe may be determined based on the target position, and control information and data for fractional subframe transmission may be received based on the number of available symbols. . In some embodiments, control information may be sent before data during fractional subframe transmission. In this case, the receiver may receive control information prior to data. In some alternative embodiments, the data may be sent before the control information. As such, the receiver may receive data prior to control information. Details will be explained with reference to the embodiment shown in FIG.

FIG. 4 depicts a flowchart of a method 400 for implementing fractional subframe transmission in a receiver according to another embodiment of the invention. Method 400 may be considered a particular implementation of method 300 described above with reference to FIG. However, it should be noted that this is only for the purpose of illustrating the principles of the invention rather than limiting its scope.

In step S410, an indicator is detected at one of the at least one potential position, the indicator indicating a magnitude of control information for fractional subframe transmission.

In some embodiments, the transmitter may send an indicator, such as, for example, PCFICH, to the receiver at the target position to indicate the amount of control information for fractional subframe transmission. In this case, the receiver may detect the indicator at one of the at least one potential position. In step S420, one of the at least one potential position is determined as a target position in response to the indicator being detected. On the other hand, the receiver may detect indicators at further potential positions.

In step S430, the number of available symbols in the subframe is determined based on the target position.

This step is similar to step S250. In some embodiments, the number of available symbols may be determined based on the target position and the total number of symbols in the subframe. As an example, if there are 14 symbols in one subframe and the target position corresponds to the 6th symbol, i.e., symbol 5, there are 8 available symbols, i.e., symbols 6 to 13. You may decide to do so. As another example, if there are 12 symbols in one subframe and the target position corresponds to the 8th symbol, i.e., symbol 7, there are 4 available symbols, i.e., symbols 8 to 11. You may decide to do so.

In step S440, control information and data for fractional subframe transmission are received based on the number of available symbols.

In some embodiments, in response to the number of available symbols being less than or equal to a predetermined threshold, the receiver may receive control information and data in the available symbols and immediately following subframes. In an exemplary embodiment, if the number of available symbols is equal to the control information size, the receiver may receive control information in the available symbols of that subframe and receive data in the immediately following subframe. It's okay. In a further exemplary embodiment, if the number of available symbols is less than the size of the control information, the receiver receives the first part of the control information in the available symbols of that subframe and the control information in the immediately following subframe. A second portion of information may be received, the first portion and the second portion comprising control information. After the control information is received, the receiver may receive data in additional subframes.

Furthermore, in some embodiments, the transport block size in a subframe may be determined based on the number of available symbols. The transport block size data may then be received in that subframe.

The transport block size indicates the size of a data block transmitted in fractional subframe transmission. According to embodiments of the invention, the transport block size may be determined by various methods. In some embodiments, the receiver may determine a scaling factor related to the number of available symbols and may determine the transport block size based on the scaling factor. The scaling factor may be defined in several ways. As mentioned above, Table 1 shows examples of scaling factors associated with different numbers of available symbols.

In an exemplary embodiment, if the number of available symbols is 1, 2, or 3, the receiver may determine that there is no data to be transmitted and there is no need to determine the transport block size. It's okay. In an 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 an 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 an 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 an 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 the 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. The receiver may be notified of the first resource block number by the transmitter. Then, the second resource block number may be determined based on the first resource block number and the scaling factor. In an exemplary embodiment, the second resource block number may be determined by equation (2). The transport block size may be determined based on the second resource block number. In some embodiments, a transport block size table, such as Table 2, may be used to determine the transport block size. In particular, when the receiver determines the second resource block number similarly to the currently adopted MCS, the transport block size may be determined by referring to Table 2.

FIG. 7 shows a block diagram of an apparatus 700 for implementing fractional subframe transmission according to an embodiment of the invention. According to embodiments of the invention, the apparatus 700 may be implemented in a transmitter, such as a BS, a D2D transmitter or other applicable devices.

As shown, the apparatus 700 includes a first determining unit 710 that determines a target position from at least one predetermined potential position in a subframe in response to detecting that a channel becomes available; An implementation unit 720 that performs subframe transmission is included.

According to the embodiment of the present invention, the first determination unit 710 includes a potential position detection unit that detects whether the current position is a potential position, and a potential position detection unit that detects whether the current position is a potential position. a first target position determination unit that determines the target position to be the target position, transmits a channel occupancy signal from the current position to the potential position in response to the fact that the current position is not the potential position, and determines the potential position to be the target position. But it's okay.

According to embodiments of the invention, each of the at least one potential position may correspond to a symbol of a subframe periodically or non-periodically.

According to embodiments of the invention, the implementing unit 720 may include a transmitting unit that transmits the indicator at the target position. The indicator indicates the size of control information for fractional subframe transmission.

According to an embodiment of the present invention, the implementation unit 720 includes a first available symbol number determining unit that determines the number of available symbols in a subframe based on the target position, and a first available symbol number determining unit that determines the number of available symbols in a subframe based on the target position; It may also include a transmission unit (transmission unit) that transmits control information and data for fractional subframe transmission from the position.

In some embodiments, the transmitter may further transmit control information and data in the available symbols and immediately following subframes in response to the number of available symbols being less than or equal to a predetermined threshold.

In some embodiments, the transmission unit may include a size determination unit that determines the transport block size in the subframe based on the number of available symbols, and the transmission unit determines the transport block size data in the subframe. You may send more.

According to embodiments of the present invention, the implementation unit 720 may include a scheduling information acquisition unit that acquires preset scheduling information related to the target position, and the implementation unit 720 may include a scheduling information acquisition unit that acquires preset scheduling information related to the target position. Based on this, fractional subframe transmission may be further implemented.

FIG. 8 shows a block diagram of an apparatus 800 for implementing fractional subframe transmission according to an embodiment of the invention. According to embodiments of the invention, the apparatus 800 may be implemented in a receiver, such as a cellular UE, a D2D receiver or other applicable devices.

As shown, the apparatus 800 includes a second determining unit 810 that determines a target position from at least one predetermined potential position in a subframe and starts fractional subframe transmission at the target position; It includes a receiving unit 820 that receives frame transmission.

According to an embodiment of the invention, the second determining unit 810 detects an indicator at one of the at least one potential position, the indicator indicating the magnitude of control information for fractional subframe transmission; , a second target position determination unit that determines one of the at least one potential position as a target position in response to the detection of the indicator.

According to an embodiment of the present invention, the second determining unit 810 includes a decoding unit that blindly decodes control information for fractional subframe transmission at one of the at least one potential positions, and a decoding unit that blindly decodes control information for fractional subframe transmission at one of the at least one potential positions; A third target position determining unit may be included that determines one of the at least one potential position as a target position depending on the target position.

According to embodiments of the invention, each of the at least one potential position may correspond to a symbol of a subframe periodically or non-periodically.

According to embodiments of the present invention, the receiving unit 820 may include a second available symbol number determining unit that determines the number of available symbols in a subframe based on the target position, and the receiving unit Control information and data for fractional subframe transmission may also be received based on the number of possible symbols.

According to embodiments of the present invention, the receiving unit 820 further receives control signals and data in the available symbols and the immediately following subframe in response to the number of available symbols being less than or equal to a predetermined threshold. Also good.

According to embodiments of the present invention, the receiving unit 820 may include a size determining unit that determines the transport block size in a subframe based on the number of available symbols, and the receiving unit determines the transport block size in the subframe. It is also possible to receive additional data.

It should also be noted that devices 700 and 800 may each be implemented with any suitable technology, either now known or developed in the future. Furthermore, a single device shown in FIG. 7 or FIG. 8 may alternatively be implemented in multiple separate devices, and multiple separate devices may be implemented in a single device. The scope of the invention is not limited in these respects.

Apparatus 700 may be configured to implement the functionality described with reference to Figures 1-2, and apparatus 800 may be configured to implement the functionality described with reference to Figures 3-4. Good things should be noted. Accordingly, features described for method 100 or 200 may be applied to corresponding components of apparatus 700, and features described for method 300 or 400 may be applied to corresponding components of apparatus 800. Furthermore, components of device 700 or device 800 may be embodied in hardware, software, firmware, and/or any combination thereof. For example, components of apparatus 700 or apparatus 800 may each be implemented by a circuit, a processor, or any other suitable device. Those skilled in the art will understand that the foregoing examples are illustrative only, not limiting.

In some embodiments of the present disclosure, device 700 or device 800 may include at least one processor. At least one processor suitable for use with embodiments of the present disclosure may be included, and may include, by way of example, both general and special purpose processors, now known or developed in the future. Device 700 or device 800 may further include at least one memory. The at least one memory may include, for example, semiconductor memory devices, such as, for example, RAM, ROM, EPROM, EEPROM, and flash memory devices. The at least one memory may be used to store a program of computer-executable instructions. Programs can be written in high-level and/or low-level compliable or interpretable programming languages. According to embodiments, computer-executable instructions, together with at least one processor, cause apparatus 700 to at least perform according to method 100 or 200, as described above, or cause apparatus 800 to perform at least according to method 300 or 200, as described above. 400.

Based on the above 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 dedicated circuitry, software, logic, or any combination thereof. For example, some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software capable of being executed by a controller, microprocessor, or other computing device. , the present disclosure is not limited thereto. Various aspects of example embodiments of the present disclosure may be described and illustrated as block diagrams, flowcharts, or some graphical representations of the blocks, devices, systems, and systems described herein. A technique or method may be implemented as, by way of non-limiting example, hardware, software, firmware, special purpose circuitry or logic, general purpose hardware or controller or other computing device, or some combination thereof.

The various blocks illustrated in FIGS. 1-4 may be implemented as method steps and/or as operations resulting from operations of computer program code, and/or as multiple combined logic circuit elements that perform related functions. , may be written in the figure. At least some aspects of example embodiments of the present disclosure may be implemented in various components such as integrated circuit chips and modules, and example embodiments of the present disclosure The present invention may be implemented in a device embodied as a combinational circuit, an FPGA, or an ASIC, configurable to operate with reference to the embodiments.

Although this specification contains many specific implementation details, these are not to be construed as limiting the scope of any disclosure or claims, but rather to the specific embodiments of the disclosure. It should be interpreted as a description of a distinctive feature. Also, certain features described in this specification, while in the context of separate embodiments, can be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination. Furthermore, although features may be described above as capable of operating in a particular combination and as originally claimed, one or more features from a claimed combination may in some cases The claimed combination may target a subcombination or a variation of a subcombination.

Similarly, although operations are shown in a particular order in the drawings, this should not be understood as requiring that such operations be performed in the particular order shown or sequentially. It is not to be understood as requiring all described operations to be performed in order to achieve desired results. Multitasking and parallel processing may be advantageous in certain situations. Furthermore, the separation of various system components in the embodiments described above is not to be understood as requiring such separation in all embodiments, and the program components and systems described are generally It should be understood that they can be integrated together into a single software product or combined into multiple software products.

When read in conjunction with the accompanying drawings, various modifications and applications of the above-described exemplary embodiments of the present disclosure may become apparent to those skilled in the relevant art in view of the above description. Any and all variations are not intended to limit this disclosure and are within the scope of the exemplary embodiments. Moreover, other embodiments of the disclosure described herein will occur to those skilled in the art that these embodiments of the disclosure have the benefit of the teachings presented in the foregoing description and associated drawings.

Therefore, the embodiments of the present disclosure are not limited to the particular embodiments disclosed, but modifications and other embodiments are intended to be included within the scope of the appended claims. should be understood. Although specific terms are used herein, they are used in a general and descriptive sense only and not for purposes of limitation.

Claims (12)

A base station,
means for recognizing multiple potential starting locations in the time domain of downlink transmissions transmitted in the unlicensed spectrum;
where the plurality of potential starting positions correspond to a first plurality of periodic symbols;
each of the first plurality of periodic symbols is spaced apart from each other by an equal number of symbols of a second plurality;
A plurality of the plurality of potential starting positions are arranged within one subframe;
an equal symbol number interval of the second plurality of symbols is shorter than a duration of the one subframe;
means for performing downlink transmission starting from a target location in the unlicensed spectrum after performing channel sensing;
The downlink transmission includes a Physical Downlink Control Channel (PDCCH),
The target location is one of the plurality of potential starting locations. The base station of claim 1, wherein the downlink transmission ends in a symbol of a subframe with occupied symbols and other unoccupied symbols. The base of claim 2, wherein the PDCCH is transmitted in the subframe with the occupied symbol and the other unoccupied symbol, or in one of the subframes preceding the subframe. Bureau. The base station according to any one of claims 1 to 3, wherein the transmission of the PDCCH is performed in response to the base station detecting that a channel in the unlicensed spectrum is idle. The base station according to any one of claims 1 to 4, wherein the plurality of potential starting positions include symbol 0 of the one subframe. A user device,
means for recognizing multiple potential starting locations in the time domain of downlink transmissions transmitted in the unlicensed spectrum;
where the plurality of potential starting positions correspond to a first plurality of periodic symbols;
each of the first plurality of periodic symbols is spaced apart from each other by an equal number of symbols of a second plurality;
A plurality of the plurality of potential starting positions are arranged within one subframe;
an equal symbol number interval of the second plurality of symbols is shorter than a duration of the one subframe;
means for receiving downlink transmissions originating from a target location in the unlicensed spectrum after channel sensing is performed;
The downlink transmission includes a Physical Downlink Control Channel (PDCCH),
The user equipment, wherein the target location is one of the plurality of potential starting locations. User equipment according to claim 6, wherein the downlink transmission ends in a symbol of a subframe with occupied symbols and other unoccupied symbols. 8. The user according to claim 7, wherein the PDCCH is received in the subframe with the occupied symbol and the other unoccupied symbol, or in one of the subframes preceding the subframe. Device. The user equipment according to any one of claims 6 to 8, wherein the reception of the PDCCH is performed in response to a base station detecting that a channel in the unlicensed spectrum is idle. User equipment according to any one of claims 6 to 9, wherein the plurality of potential starting positions include symbol 0 of the one subframe. A method performed by a base station, the method comprising:
recognizing multiple potential starting locations in the time domain for downlink transmissions transmitted in the unlicensed spectrum;
where the plurality of potential starting positions correspond to a first plurality of periodic symbols;
each of the first plurality of periodic symbols is spaced apart from each other by an equal number of symbols of a second plurality;
A plurality of the plurality of potential starting positions are arranged within one subframe;
an equal symbol number interval of the second plurality of symbols is shorter than a duration of the one subframe;
after performing channel sensing, performing a downlink transmission starting from a target location in the unlicensed spectrum;
The downlink transmission includes a Physical Downlink Control Channel (PDCCH),
The method wherein the target location is one of the plurality of potential starting locations. A method performed by a user device, the method comprising:
recognizing multiple potential starting locations in the time domain for downlink transmissions transmitted in the unlicensed spectrum;
where the plurality of potential starting positions correspond to a first plurality of periodic symbols;
each of the first plurality of periodic symbols is spaced apart from each other by an equal number of symbols of a second plurality;
A plurality of the plurality of potential starting positions are arranged within one subframe;
an equal symbol number interval of the second plurality of symbols is shorter than a duration of the one subframe;
receiving a downlink transmission originating from a target location in the unlicensed spectrum after channel sensing is performed;
The downlink transmission includes a Physical Downlink Control Channel (PDCCH),
The method wherein the target location is one of the plurality of potential starting locations.

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