JP6930554B2 - Methods performed by base stations and user equipment - Google Patents

Description

Embodiments of the present invention generally relate to communication technology. More specifically, embodiments of the present invention relate to methods and devices for performing fractional subframe transmission.

In the 3rd Generation Partnership Project (3GPP), the network configuration and various required for the movement of terminals between the 3GPP wireless communication network and the wireless LAN (Wireless Local Area Network (WLAN)). Technology is called interworking WLAN (interworking WLAN). Multimode wireless communication technology is being developed to use multiple wireless communication technologies at the same time. The use of multiple wireless communication technologies simultaneously increases the transfer rate per unit time or improves the reliability of the terminal.

Spectrum is a very scarce resource in wireless communications. A licensed band represents a frequency band that is exclusively licensed to a particular operator to provide a particular wireless service. On the other hand, the unlicensed band represents a frequency band that is not assigned to a specific operator, but is open so that all entities that meet predetermined requirements can use the frequency band.

In some parts of the world, unlicensed bandwidth technology must comply with certain rules and channel bandwidth occupancy requirements, such as Listen-Before-Talk (LBT). LBT introduces channel availability uncertainty. For example, unlicensed bands may be used at any time within a subframe.

WLAN utilizing Wireless Fidelity (WiFi) is a typical wireless communication technology used in an unlicensed band. The current Long Term Evolution (LTE) time accuracy is much higher than the WiFi time accuracy, providing less competitiveness for License Assisted Access (LAA) with LBT. In this way, fair coexistence between LTE and other technologies such as WiFi is expected, as well as between LTE operators.

In order to further compete in the unlicensed bandwidth, it is necessary to carry out 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 methods and devices for fractional subframe transmission with low signaling overhead and high resource utilization.

According to a first aspect of an embodiment of the invention, the embodiment of the invention provides a method of performing fractional subframe transmission. The method determines a target position from at least one predetermined potential position in a subframe in response to detecting that a channel is available, and performs fractional subframe transmission from the target position. , May be included. This method may be carried out at the transmitter.

According to a second aspect of an embodiment of the invention, the embodiment of the invention provides a method of performing fractional subframe transmission. The method includes determining a target position from at least one predetermined potential position in the subframe, and starting fractional subframe transmission at the target position and receiving fractional subframe transmission from the target position. But it's okay. This method may be carried out at the receiver.

According to a third aspect of the embodiment of the present invention, the embodiment of the present invention provides an apparatus for performing fractional subframe transmission. The device determines the target position from at least one predetermined potential position in the subframe in response to detecting that the channel is available, and the fractional subframe transmission from the target position. May include an implementing unit, for carrying out. This device may be implemented in a transmitter.

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

As an example, by reading in conjunction with the accompanying drawings illustrating the principles of the embodiments of the invention, other features and advantages of the embodiments of the invention will be apparent from the following description of the particular embodiments. Let's go.

Embodiments of the present invention are presented in an exemplary sense and their advantages are described in more detail below with reference to the accompanying drawings.

The flowchart of the method 100 which carries out fractional subframe transmission in the transmitter which concerns on one Embodiment of this invention is shown.

A flowchart of a method 200 for carrying out fractional subframe transmission in a transmitter according to another embodiment of the present invention is shown.

The flowchart of the method 300 which carries out fractional subframe transmission in the receiver which concerns on one Embodiment of this invention is shown.

The flowchart of the method 400 which carries out fractional subframe transmission in the receiver which concerns on another Embodiment of this invention is shown.

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

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

The block diagram of the apparatus 700 which carries out the fractional subframe transmission which concerns on embodiment of this invention is shown.

The block diagram of the apparatus 800 which carries out the fractional subframe transmission which concerns on embodiment of this invention is shown.

Throughout the drawings, the same or similar reference numbers indicate the same or similar elements.

The subject matter described herein is described herein with reference to some exemplary embodiments. These embodiments are described solely for the purpose of allowing one of ordinary skill in the art to better understand and implement the subject matter described herein, rather than intending to limit the scope of the subject matter. It should be understood that there is.

The terms used herein are intended to describe a particular embodiment and are not intended to be limited to exemplary embodiments. As used herein, the singular is intended to include the plural unless the context clearly indicates otherwise. In addition, the terms "contain", "contain", "contain" and / or "contain" as used herein are the features, integers, steps, actions, elements, and / Alternatively, it will be understood that it identifies the presence of a component but does not preclude the presence or addition of one or more other features, integers, steps, actions, elements, and / or groups.

It should also be noted that in some alternative embodiments, the functions / actions mentioned are not limited to the order in which they are mentioned in the figure. For example, the two functions or actions shown in succession may actually be performed simultaneously, or sometimes in reverse order, based on the functions / actions included.

Embodiments of the present invention cover solutions for performing fractional subframe transmission. This solution may be implemented between the receiver and the transmitter. Specifically, upon detecting that a channel is available, the transmitter determines a target position from at least one potential position in the subframe and targets. Fractional subframe transmission may be performed from the position. Similarly, the receiver may determine the target position from at least one predetermined potential position and receive the fractional subframe transmission from the target position. In this way, the transmission may be carried out without introducing signaling overhead. On the other hand, once the channel is idle, transmission may start from the current subframe instead of the next subframe. In this way, the resource utilization rate is improved.

In the embodiment of the present invention, the 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 transmission of control information. , 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 in the downlink transmission and the first 8 symbols are not available, then this subframe is considered a fractional subframe. Is also good.

In the present disclosure, fractional subframe transmission may refer to transmission performed in one or more subframes, and at least one of the one or more subframes is a fractional subframe. As an example, fractional subframe transmission can be varied, such as when the first subframe is a fractional subframe, the last subframe is a fractional subframe, the first and last subframes are fractional subframes, and so on. May be included.

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

According to some other embodiments of the present 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 various 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, of course, the present invention may be embodied in future wireless communication technologies or systems. It should not be considered that the scope of the present invention is limited to the above-mentioned system.

Here, some exemplary embodiments of the present invention will be described with reference to the drawings. First, refer to FIG. 1, which is a flowchart of the method 100 for carrying out fractional subframe transmission in the transmitter according to the embodiment of the present invention. Method 100 may be performed on transmitters such as BS, D2D transmitters and other suitable devices.

Method 100 is started in step S110 and the target position is determined from at least one predetermined potential position in the subframe in response to detecting that the channel is available.

According to the embodiment of the present invention, the subframe may be composed of a plurality of symbols. As an example, the subframe may be 1 ms, and may be composed of 14 symbols such as symbols 0 to 13. Positions such as potential position, target position, current position, and next position refer to the time point or time period in the subframe. Is also good. In some embodiments, the position may correspond to a moment in the subframe. Alternatively, the position may correspond to a subframe symbol. In this regard, the position may occupy a period, such as the period of a symbol. In the context, the target position may point to a position where fractional transmission is initiated, and the potential position may point to a predetermined position which is a candidate for the 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 present invention, there may be one or more predetermined potential positions in the subframe. Each of the potential positions may correspond to a subframe symbol periodically or aperiodically. In some embodiments, the potential position may be configured every three symbols, for example symbols 0, 3, 6, 9 and 12. For example, the potential position may be set as follows.

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

It should be noted that the above examples are given as examples rather than limitations. It can be understood 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.

According to an embodiment of the present invention, a clear channel assessment (Clear Chanel Assessment (CCA)) or an extended clear channel assessment (Extended Clear Chanel Assessment (eCCA)) may be performed. With CCA / eCCA, the transmitter may detect if the channel is available. Depending on detecting that the 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 the 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 an embodiment of the invention, in step S120, the transmitter may transmit an indicator to the receiver at the target position. The indicator may indicate the magnitude of control information for fractional subframe transmission, such as the number of symbols in the Physical Downlink Control Channel (PDCCH). 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 the receiver detects PCFICH, it may know the number of PDCCH symbols. It should be noted that the above examples do not imply any limitation of the scope of the subject matter described herein, and the above examples are given for illustration purposes only. In some embodiments, as can be understood, the control information may be configured by higher layer signals or by specifications.

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

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

FIG. 5 shows a schematic view of fractional subframe transmission according to an embodiment of the present invention. FIG. 5 schematically represents four subframes 0 to 3. For subframe 0, there are three potential positions 521, 522 and 523, with the first potential position 521 corresponding to the start of subframe 0, for example symbol 0 of subframe 0. The CCA / eCCA501 may start from the first potential position 521. During CCA / eCCA501, the transmitter may determine that the channel is available at position 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, or the potential position 522 may be determined as the target position. Fractional subframe transmissions may then be initiated from the target position, control information may be transmitted by PDCCH in periods 503, 505, 507 and 509, and data may be transmitted by PDSCH in periods 504, 506, 508 and 510. It may be sent.

Here, reference is made to FIG. 2 showing a flowchart of a method 200 for carrying out fractional subframe transmission in a transmitter according to another embodiment of the present invention. Method 200 may be considered as a specific implementation of method 100 described above with reference to FIG. However, it should be noted that this is for the purpose of explaining the principles of the present invention, rather than limiting its scope.

Method 200 is started in step S210 and the channel is detected as available.

According to embodiments of the present invention, the availability of channels may be detected by several methods, such as energy detection, carrier sensing, and the like. 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, and may be different from the transmitter that implements 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 the intensity threshold. Channels may be determined to be available depending on the measured intensity being less than the intensity threshold. The intensity threshold may be a predetermined threshold set according to system requirements, specifications, channel quality, and the like. According to embodiments of the present invention, the intensity threshold may be set as a fixed value or a dynamically changing value. It should be understood that the above exemplary embodiments do not imply any limitation of the subject matter described herein and are for illustration purposes only. The intensity threshold may be implemented by other suitable methods.

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 that uses the channel, and may be different from a transmitter that implements the method according to the embodiment of the present invention. Whether or not a channel is available may be determined based on the signal.

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

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

When the current position is the potential position, the flow proceeds to step S240, and the potential position is determined as the target position. If the current position is not the potential position, the flow proceeds to step S230 and the channel occupancy signal is transmitted from the current position to the potential position. Then, the flow proceeds to step S240, and 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 sixth symbol, symbol 5, it may be determined that there are 8 available symbols, ie symbols 6-13. As another example, if there are 12 symbols in one subframe and the target position corresponds to the 8th symbol, symbol 7, even if it is determined that there are 4 available symbols, symbols 8-11. 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 the channel is available in a fast symbol, eg, symbols 0-6, regular control information, eg, regular PDCCH, may be applied. If the channel is available in slower symbols, such as symbols 9-13, shortening control information, such as shortened PDCCH, may be applied. In an exemplary embodiment, the normal PDCCH may occupy 3 symbols and the shortened PDCCH may occupy 1 or 2 symbols.

Further, in some embodiments, the transmitter transmits control information and data in the available symbols of this subframe and in the subframe immediately following, depending on whether the number of available symbols is less than or equal to a predetermined threshold. You may. In an exemplary embodiment, if the number of available symbols is equal to the magnitude of the control information, the transmitter may transmit control information in the available symbols of this subframe and transmit data in the subframe immediately following it. You may. In a further exemplary embodiment, if the number of available symbols is less than the magnitude of the control information, the transmitter transmits a first portion of the control information in the available symbols of this subframe, followed by additional subs. A second part of the control information may be transmitted in the frame, and the control information is composed of the first part and the second part. After the control information has been transmitted, the transmitter may transmit data in additional subframes. According to an embodiment of the present invention, a predetermined threshold value may be set as a fixed value or a dynamically changed value, may be composed of an upper layer signal, or may be specified by specifications. In an exemplary embodiment, the predetermined threshold may be set to 3.

FIG. 6 shows a schematic view of fractional subframe transmission according to an embodiment of the present invention. FIG. 6 schematically represents four subframes 0 to 3. For subframe 0, there are two potential positions 621 and 622. The CCA / eCCA601 may start from the first potential position 621. During CCA / eCCA601, the transmitter may determine that the channel is available at potential position 622. In this way, the potential position 622 may be determined as the target position. Then, the fractional subframe transmission may be started from the target position, the control information may be transmitted by the PDCCH in the periods 602, 603 and 605, and the data may be transmitted by the PDSCH in the periods 604 and 606. As shown in FIG. 6, control information is transmitted in the available symbols in subframe 0 and in the next subframe 1, corresponding to periods 602 and 603, respectively. After the control information, the data is transmitted in period 604. Specifically, the first part of the control information is transmitted in the period 602 and the second part of the control information is transmitted in the period 603.

Note that fractional subframe transmission ends at a partial or complete subframe of the subframe. According to the embodiment shown in FIG. 5, fractional subframe transmission ends at position 525. As described above, a part of the subframe 3 is used in the fractional subframe transmission. In this case, both the first subframe (ie, subframe 0) and the last subframe (ie, subframe 3) are fractional subframes. Alternatively, as shown in FIG. 6, fractional subframe transmission ends at the end of subframe 2. In other words, fractional subframe transmission ends with a complete subframe.

Further, in some embodiments, the transport block size in the 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 the data block transmitted in the fractional subframe transmission. According to embodiments of the present invention, the transport block size may be determined by various methods. In some embodiments, the transmitter may determine a scaling factor associated with 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 shows 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, and the available symbols are After transmitting the control information, it may be determined that it is not sufficient to transmit the 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 0.25 to 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, the transmitter may determine that the associated scaling factor is 1 if the number of available symbols is 13 or 14.

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 in several ways based on the scaling factor. As an example, a first resource block number indicating the number of resource blocks allocated for transmission may be acquired. 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, the transport block size table is used to determine the transport block size. Table 2 represents an exemplary transport block size table.

The horizontal direction of Table 2 corresponds to a resource block number such as the second resource block number in the embodiment, and the vertical direction corresponds to a modulation and coding scheme (MCS). In the embodiment, when determining the second resource block number similar to 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 MCS. May be done. As an example, when the number of second resource blocks is 8 and the MCS is 8, the transport block size may be determined as 1096.

It should be noted that although the size of Table 2 is 10x27, Table 2 is a simplification of 3GPP TS36.213, which is 34x110 in size. Further, it should be noted that the table of the above examples is for illustration purposes only and does not imply any limitation in the subject matter described herein. Other suitable tables may be used in determining the transport block size.

Here, reference is made to FIG. 3 showing a flowchart of a method 300 for carrying out fractional subframe transmission in the receiver according to the embodiment of the present invention. Method 300 may be implemented in receivers such as UEs, D2D receivers and other suitable devices.

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

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

The target position indicates when fractional subframe transmission begins. There may be several ways in which the receiver determines the target position based on one or more predetermined potential positions in the subframe. In some embodiments, the transmitter may transmit the indicator to the receiver at the target position, for example, an 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, for example, at one of at least one potential position, indicated as potential position 1, the receiver may detect the indicator. Depending on the indicator being detected, the receiver may determine at least one of the potential positions as the target position. On the other hand, the receiver may determine that this potential position is not the target position, and may perform the same detection at a further potential position, such as potential position 2.

Alternatively, in some embodiments, the transmitter does not have to transmit the indicator. In this case, the receiver may blind-code the control signal for fractional subframe transmission at at least one of the potential positions. Depending on the success of the blind coding, the receiver may determine at least one of the potential positions as the target position.

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

In some embodiments, the receiver may know the magnitude of the control information based on an indicator indicating the magnitude of the control information for fractional subframe transmission, and accordingly receives the control information from the target position. You may.

According to an embodiment 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 transmitted before the data during fractional subframe transmission. In this case, the receiver may receive the control information prior to the data. In some alternative embodiments, the data can be transmitted before the control information. As such, the receiver may receive the data prior to the control information. Details will be described with reference to the embodiment of FIG.

FIG. 4 shows a flowchart of a method 400 for performing fractional subframe transmission in a receiver according to another embodiment of the present invention. Method 400 may be regarded as a specific implementation of method 300 described above with reference to FIG. However, it should be noted that this is for the purpose of explaining the principles of the present invention, rather than limiting its scope.

In step S410, the indicator is detected at at least one of the potential positions, and the indicator indicates the magnitude of control information for fractional subframe transmission.

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

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 total number of symbols in the target position and 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, then there are 8 available symbols, i.e. symbols 6-13. You may decide that you are. As another example, if there are 12 symbols in one subframe and the target position corresponds to the 8th symbol, i.e. symbol 7, then there are 4 available symbols, i.e. symbols 8-11. You may decide that you are.

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

In some embodiments, the receiver may receive control information and data in the available symbols and immediately following subframes, depending on whether the number of available symbols is less than or equal to a predetermined threshold. In an exemplary embodiment, if the number of available symbols is equal to the magnitude of the control information, the receiver may receive the control information in the available symbols of that subframe and receive the data in the subframe immediately following it. You may. In a further exemplary embodiment, if the number of available symbols is smaller than the size of the control information, the receiver receives the first part of the control information with the available symbols of that subframe and controls in the immediately following subframe. The second part of the information may be received, and the first part and the second part constitute the control information. After the control information is received, the receiver may receive the data in additional subframes.

Further, in some embodiments, the transport block size in the subframe may be determined based on the number of available symbols. Then, the data of the transport block size may be received in the subframe.

The transport block size indicates the size of the data block transmitted in the fractional subframe transmission. According to embodiments of the present invention, the transport block size may be determined by various methods. In some embodiments, the receiver may determine a scaling factor associated with 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 that it is not necessary to determine the transport block size. You may. 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, the receiver may determine that the associated scaling factor is 1 if the number of available symbols is 13 or 14.

In some embodiments, the transport block size may be determined in several ways based on the scaling factor. As an example, a first resource block number indicating the number of resource blocks allocated for transmission may be acquired. The first resource block number may be notified to the receiver 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, the transport block size table, eg, Table 2, may be used to determine the transport block size. In particular, when the receiver determines the second resource block number as in the currently adopted MCS, the transport block size may be determined by referring to Table 2.

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

As shown, the apparatus 700 determines the target position from at least one predetermined potential position in the subframe in response to detecting that the channel is available, a first determination unit 710, fractional from the target position. Includes an implementation unit 720, which performs subframe transmission.

According to the embodiment of the present invention, the first determination unit 710 is a potential position detection unit that detects whether or not the current position is a potential position, and a potential position depending on whether the current position is a potential position. Is determined as the target position, and depending on whether the current position is not the potential position, a channel occupancy signal is transmitted from the current position to the potential position, and a first target position determination unit that determines the potential position as the target position is included. But it's okay.

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

According to an embodiment of the present invention, the embodiment 720 may include a transmitter that transmits an indicator at a target position. The indicator indicates the magnitude of control information for fractional subframe transmission.

According to an embodiment of the present invention, the implementation unit 720 determines the number of available symbols in the subframe based on the target position, the first available symbol number determination unit, and the target based on the number of available symbols. A transmission unit (transmission unit) that transmits control information and data for fractional subframe transmission from a position may be included.

In some embodiments, the transmission unit may further transmit control information and data in the available symbols and immediately following subframes, depending on whether the number of available symbols is less than or equal to a predetermined threshold.

In some embodiments, the transmission unit may include a sizing unit, which determines the transport block size in the subframe based on the number of available symbols, and the transmission unit may include data on the transport block size in the subframe. You may also send it.

According to an embodiment 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 may include the preset scheduling information. Fractional subframe transmission may be further performed based on the above.

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

As shown, the apparatus 800 determines the target position from at least one predetermined potential position in the subframe, the second determination unit 810 that starts the fractional subframe transmission at the target position, and the fractional sub from the target position. A receiving unit 820 for receiving a frame transmission is included.

According to an embodiment of the present invention, the second determination unit 810 detects an indicator at at least one of the potential positions, and the indicator is an indicator detection unit indicating the magnitude of control information for fractional subframe transmission, and an indicator detection unit. , A second target position determination unit, which determines at least one of the potential positions as the target position, depending on the detection of the indicator, may be included.

According to the embodiment of the present invention, the second determination unit 810 is a decoding unit that blindly decodes the control information of the fractional subframe transmission at at least one potential position, and the blind decoding is successful. A third target position determination unit, which determines at least one of the potential positions as the target position, may be included.

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

According to an embodiment of the present invention, the receiving unit 820 may include a second available symbol number determining unit, which determines the number of available symbols in the subframe based on the target position, and the receiving unit may be used. Further control information and data for fractional subframe transmission may be received based on the number of possible symbols.

According to an embodiment of the present invention, the receiver 820 further receives control signals and data in the available symbols and immediately following subframes, depending on whether the number of available symbols is less than or equal to a predetermined threshold. Is also good.

According to an embodiment of the present invention, the receiving unit 820 may include a sizing unit that determines the transport block size in the subframe based on the number of available symbols, and the receiving unit may include the transport block size in the subframe. Data may be further received.

It should also be noted that the devices 700 and 800 may be implemented by any suitable technique currently known or developed in the future, respectively. Further, the single device shown in FIG. 7 or 8 may be separately implemented in a plurality of devices in an alternative manner, and the plurality of separate devices may be implemented in a single device. The scope of the present invention is not limited to these points.

The device 700 may be configured to implement the functions described with reference to FIGS. 1-2, and the device 800 may be configured to implement the functions described with reference to FIGS. 3-4. It should be noted that it is good. Thus, the features described for method 100 or 200 may be applied to the corresponding components of device 700, and the features described for method 300 or 400 may be applied to the corresponding components of device 800. Further, the components of device 700 or device 800 may be embodied in hardware, software, firmware, and / or any combination thereof. For example, the components of device 700 or device 800 may be implemented by circuits, processors or any other suitable device, respectively. Those skilled in the art will appreciate that the above examples are not limited, but merely for illustration purposes.

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 the embodiments of the present disclosure may be included, and as an example, both general purpose and dedicated processors already known or developed in the future may be included. The device 700 or the device 800 may further include at least one memory. The at least one memory may include, for example, a semiconductor memory device, such as, for example, RAM, ROM, EPROM, EEPROM and flash memory devices. At least one memory may be used to store a program of instructions that can be executed by a computer. Programs can be written in high-level and / or low-level compilable or interpretable programming languages. According to embodiments, computer-executable instructions, along with at least one processor, cause device 700 to perform at least according to method 100 or 200, as described above, or device 800 to perform method 300 or as described above. It may be configured to at least carry out according to 400.

Based on the above description, one of ordinary skill in the art will appreciate that the present disclosure may be embodied in a device, method or computer program product. In general, various exemplary embodiments may be implemented by hardware or dedicated circuits, software, logic, or any combination thereof. For example, some embodiments may be implemented in hardware, while other embodiments may be implemented in firmware or software that can be executed by a controller, microprocessor or other computing device. , The present disclosure is not limited to this. Various aspects of the exemplary embodiments in the present disclosure are described and described as block diagrams, flowcharts or some graphical representations, but these blocks, devices, systems, described herein. The technology or method may be implemented as, as a non-limiting example, hardware, software, firmware, dedicated circuits or logic, general purpose hardware or controllers or other computing devices, or some combination thereof.

The various blocks shown in Figure 1-4 are as steps in the method and / or as actions resulting from the actions of the computer program code and / or as multiple coupled logic circuit elements performing related functions. , May be described in the figure. At least some of the exemplary embodiments of the present disclosure may be implemented by various components such as integrated circuit chips and modules, and the exemplary embodiments of the present disclosure are exemplary of the present disclosure. It may be implemented in a coupling circuit, FPGA or device embodied as an ASIC that can be configured to operate with reference to various embodiments.

Although the present specification contains many specific implementation details, these should not be construed in a limited manner to the extent of any disclosure or allegation, but rather to specific disclosure embodiments. It should be interpreted as an explanation of the unique characteristics. Also, in the context of separate embodiments, the particular features described herein can be implemented in combination in a single embodiment. Conversely, the various features described in the context of a single embodiment can be implemented separately in multiple embodiments or in any suitable subordinate combination. Further, it may be stated above that the features can behave in a particular combination and as such originally claimed, but one or more features from the claimed combination may be combined in some cases. Can be removed from, and the alleged combination may target variations of subordinate combinations or subordinate combinations.

Similarly, the actions are shown in the drawings in a particular order, but this should be understood as requiring such actions to be performed in the particular order shown or in order. It should not be understood that all described actions are required to be performed without or in order to obtain favorable results. In certain situations, multitasking and parallel processing may be advantageous. Moreover, the separation of the various system components in the embodiments described above should not be understood as requiring such separation in all embodiments, and the program components and systems described are generally described. It should be understood that it is possible to integrate together into a single software product or combine it into multiple software products.

Upon reading in conjunction with the accompanying drawings, various modifications, application of the aforementioned exemplary embodiments of the present disclosure, may be apparent to those skilled in the art in the context of the above description. Any and all modifications are not limited to this disclosure and are included within the scope of exemplary embodiments. Moreover, other embodiments of the disclosure described herein remind those skilled in the art that these embodiments of the present disclosure have the advantages of the teachings set forth in the above description and related drawings.

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

Claims (10)

The method performed by the base station
Recognize said possible start positions of downlink transmission transmitted in an unlicensed spectrum, corresponding to a first plurality of symbols periodically and evenly spaced within a subframe. That and
Detecting that a channel is idle in the unlicensed spectrum and
Includes performing the downlink transmission from one of the possible start positions after detecting that the channel is idle.
The equal intervals are respectively the a period of the second plurality of symbols, the second plurality of symbols is less than 14 symbols, method. The method of claim 1, wherein the downlink transmission ends at a subframe symbol with an occupied symbol and another unoccupied symbol. Claim that the Physical Downlink Control Channel ( PDCCH ) is transmitted in the subframe with the occupied symbol and the other unoccupied symbols, or in one of the subframes preceding the subframe. The method according to 2. The method according to any one of claims 1 to 3, wherein the downlink transmission occupies one or a plurality of consecutive subframes. The method according to any one of claims 1 to 4, wherein the first plurality of symbols include symbol 0 of the subframe. A method performed by a user device,
Recognize said possible start positions of downlink transmission transmitted in an unlicensed spectrum, corresponding to a first plurality of symbols periodically and evenly spaced within a subframe. That and
Including performing the reception of the downlink transmission from one of the possible starting positions after the channel is detected to be idle in the unlicensed spectrum.
The equal intervals are respectively the a period of the second plurality of symbols, the second plurality of symbols is less than 14 symbols, method. The method of claim 6, wherein the downlink transmission ends at a subframe symbol with an occupied symbol and another unoccupied symbol. A Physical Downlink Control Channel ( PDCCH ) is transmitted in one of the subframes with the occupied symbol and the other unoccupied symbols, or a subframe preceding the subframe. The method according to claim 7. The method according to any one of claims 6 to 8, wherein the downlink transmission occupies one or a plurality of consecutive subframes. The method according to any one of claims 6 to 9, wherein the first plurality of symbols include symbol 0 of the subframe.

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