JP2021093734A - Terminal equipment, communication method, and integrated circuit - Google Patents

Abstract

To perform self-contained behavior by using a time unit configuration considering HARQ (Hybrid Automatic Repeat Request) process.SOLUTION: In a base station 100, a transmission unit 109 transmits outgoing signals using an outgoing transmission area in a time unit that is constituted of the outgoing transmission area, an uplink transmission area, and a gap segment which is a changeover point from the outgoing transmission area to the uplink transmission area, and a reception unit 111 receives incoming signals using the uplink transmission area in the time unit. Here, each time unit includes the outgoing transmission area and the uplink transmission area for multiple HARQ processes.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to base stations, terminals and communication methods.

In downlink communication in mobile communication, a base station (sometimes called "eNB" or "gNB") generally has a terminal (sometimes called "UE (User Equipment)") as opposed to a terminal. Sends a control signal to receive data. The terminal decodes the control information transmitted to the own terminal by the received control signal, and obtains information on frequency allocation or adaptive control necessary for receiving data. The terminal receives the data from the base station using the radio resource indicated by the decoded control information.

Further, in uplink communication in mobile communication, generally, a base station transmits a control signal for transmitting data to the terminal. The terminal decodes the control information transmitted to the terminal by the received control signal, and obtains information on frequency allocation or adaptive control necessary for data transmission. The terminal generates data according to the decoded control information, and transmits the data to the base station using the instructed radio resource.

In mobile communication, HARQ (Hybrid Automatic Repeat Request) is generally applied to downlink data. That is, the terminal feeds back the response signal indicating the error detection result of the downlink data to the base station.

Similarly, in mobile communication, HARQ is applied to uplink data. That is, the base station feeds back a response signal indicating the error detection result of the uplink data to the terminal. Alternatively, the base station transmits a control signal to the terminal at an arbitrary timing to retransmit the data.

By the way, with the spread of services using mobile broadband in recent years, data traffic in mobile communication continues to increase exponentially, and there is an urgent need to expand the data transmission capacity in the future. In the future, the IoT (Internet of Things), in which all "things" are connected via the Internet, is expected to develop dramatically. In order to support the diversification of services by IoT, not only data transmission capacity but also various requirements such as low latency and communication area (coverage) are required to be dramatically improved. Against this background, technological development and standardization of the 5th generation mobile communication system (5G), which greatly improves performance and functions compared to the 4th generation mobile communication systems (4G), has been promoted. ing.

One of the 4G radio access technologies (RAT) is LTE-Advanced standardized by 3GPP. 3GPP is developing a new wireless access technology (NR: New RAT) that is not necessarily backward compatible with LTE-Advanced in the standardization of 5G.

In NR, as a time unit configuration (frame configuration) that realizes low delay, which is one of the requirements of 5G, "downlink transmission region (DL transmission region)" and "guard region (Guard region) (no transmission section or gap). A time unit (for example, 1 subframe, NR subframe, or a fixed time length (for example, 1 ms)) having a predetermined time interval including "a section" and "UL transmission region". The time length including the number of OFDM symbols) is being studied (see, for example, Non-Patent Document 1). The operation performed by this time unit is called "Self-contained operation".

Also, using the above time unit, "DL self-contained" operation to realize low delay of downlink communication and "UL self-contained" operation to realize low delay of uplink communication are examined. Has been done. In the DL self-contained operation, the base station receives the control signal (DL assignment) required for the terminal to receive the downlink data and the downlink data (DL data) assigned by the control signal in the downlink transmission area. Upon transmission, the terminal transmits a response signal and an uplink control signal (UCI: Uplink Control Indicator) for the downlink data in the uplink transmission area. Further, in the UL self-contained operation, the base station transmits a control signal (UL assignment) necessary for the terminal to transmit uplink data in the downlink transmission area, and the terminal transmits the control signal (UL assignment) in the uplink transmission area. Sends the uplink data (UL data) and UCI assigned by the signal.

Further, in NR, as a time unit configuration for realizing low delay, it is required that the time interval from the transmission of the response signal to the transmission of the retransmission data should be reduced as much as possible (see, for example, Non-Patent Document 2). ).

In addition, it has been agreed in the NR that a time unit configuration with a subcarrier interval of 15 kHz and 14 symbols per ms (OFDM symbol) should be considered as a basis, similar to the LTE subframe configuration (for example, non-carrier configuration). See Patent Document 3).

R1-166027, Qualcomm, Panasonic, NTT DOCOMO, KT Corp, MediaTek, Intel, “WF on Frame Structure and Evaluation,” 3GPP TSG RAN WG1 # 85, May 2016 R1-165887, LG Electronics, Panasonic, Qualcomm, NTT DOCOMO, “WF on minimum HARQ Timing,” 3GPP TSG RAN WG1 # 85, May 2016 R1-165886, Panasonic, Intel, Samsung, NTT DOCOMO, Qualcomm, Huawei, MediaTek, “WF on Scalable Numerology Symbol Boundary Alignment,” 3GPP TSG RAN WG1 # 85, May 2016

However, regarding the time unit configuration used for the Self-contained operation, the control using the HARQ process has not been sufficiently studied.

One aspect of the present disclosure is to provide a base station, a terminal, and a communication method capable of performing a self-contained operation using a time unit configuration in consideration of the HARQ process.

The base station according to one aspect of the present disclosure is the downlink in a time unit composed of a downlink transmission region, an uplink transmission region, and a gap section which is a switching point from the downlink transmission region to the uplink transmission region. A transmission unit that transmits a downlink signal in a transmission area and a reception unit that receives an uplink signal in the uplink transmission area in the time unit are provided, and each time unit includes the downlink transmission area for a plurality of HARQ processes. And the uplink transmission area are included, respectively.

The terminal according to one aspect of the present disclosure is the downlink transmission in a time unit composed of a downlink transmission area, an uplink transmission area, and a gap section which is a switching point from the downlink transmission area to the uplink transmission area. A receiving unit that receives a downlink signal in an area and a transmitting unit that transmits an uplink signal in the uplink transmission area in the time unit are provided, and each time unit includes the downlink transmission area and the downlink transmission area for a plurality of HARQ processes. Each of the uplink transmission areas is included.

The communication method according to one aspect of the present disclosure is the downlink in a time unit composed of a downlink transmission area, an uplink transmission area, and a gap section which is a switching point from the downlink transmission area to the uplink transmission area. A downlink signal is transmitted in a transmission region, an uplink signal is received in the uplink transmission region in the time unit, and each time unit includes the downlink transmission region and the uplink transmission region for a plurality of HARQ processes, respectively.

The communication method according to one aspect of the present disclosure is the downlink in a time unit composed of a downlink transmission area, an uplink transmission area, and a gap section which is a switching point from the downlink transmission area to the uplink transmission area. The downlink signal is received in the transmission region, the uplink signal is transmitted in the uplink transmission region in the time unit, and each time unit includes the downlink transmission region and the uplink transmission region for a plurality of HARQ processes, respectively.

It should be noted that these comprehensive or specific aspects may be realized by a system, a method, an integrated circuit, a computer program, or a recording medium, and any of the system, a device, a method, an integrated circuit, a computer program, and a recording medium. It may be realized by various combinations.

According to one aspect of the present disclosure, a self-contained operation can be performed using a time unit configuration in consideration of the HARQ process.

Further advantages and effects in one aspect of the present disclosure will be apparent from the specification and drawings. Such advantages and / or effects are provided by some embodiments and features described in the specification and drawings, respectively, but not all need to be provided in order to obtain one or more identical features. There is no.

Diagram showing an example of time unit configuration during DL Self-contained operation Diagram showing an example of time unit configuration during UL Self-contained operation The figure which shows an example of the symbol length of each area in the time unit at the time of DL Self-contained operation. The figure which shows an example of the symbol length of each area in the time unit at the time of UL Self-contained operation. Block diagram showing the main configuration of the base station according to the present disclosure Block diagram showing the main configuration of the terminal according to the present disclosure A block diagram showing a configuration of a base station during DL Self-contained operation according to the first embodiment. A block diagram showing a terminal configuration during DL Self-contained operation according to the first embodiment. A block diagram showing a configuration of a base station during UL Self-contained operation according to the first embodiment. A block diagram showing a terminal configuration during UL Self-contained operation according to the first embodiment. The figure which shows the time unit configuration 1 at the time of DL Self-contained operation which concerns on Embodiment 1. The figure which shows the time unit configuration 1 at the time of UL Self-contained operation which concerns on Embodiment 1. The figure which shows the HARQ operation example at the time of DL Self-contained operation which concerns on Embodiment 1. The figure which shows the HARQ operation example at the time of UL Self-contained operation which concerns on Embodiment 1. The figure which shows the time unit configuration 2 at the time of DL Self-contained operation which concerns on Embodiment 1. The figure which shows the time unit configuration 3 at the time of DL Self-contained operation which concerns on Embodiment 1. The figure which shows the time unit configuration 3 at the time of UL Self-contained operation which concerns on Embodiment 1. The figure which shows the modification of the time unit composition 3 at the time of UL Self-contained operation which concerns on Embodiment 1. The figure which shows the selection example of the time unit composition which concerns on Embodiment 3. The figure which shows the selection example of the time unit composition which concerns on Embodiment 3. The figure which shows the time unit configuration example at the time of DL Self-contained operation which concerns on another embodiment. The figure which shows the time unit configuration example at the time of UL Self-contained operation which concerns on another embodiment. The figure which shows the time unit configuration example in the downlink band of FDD which concerns on another embodiment. The figure which shows the time unit configuration example in the upstream band of FDD which concerns on another embodiment. The figure which shows the time unit configuration example when the subcarrier interval which concerns on other embodiment is 15kHz. The figure which shows the time unit configuration example when the subcarrier interval which concerns on other embodiment is 60kHz.

[Background to this disclosure]
First, the background to this disclosure will be described.

As a time unit configuration capable of self-contained operation in a TDD (Time Division Duplex) system, the configurations shown in FIGS. 1A and 1B are being studied (see, for example, Non-Patent Document 2). FIG. 1A shows a time unit configuration capable of DL self-contained operation, and FIG. 1B shows a time unit configuration capable of UL self-contained operation.

The gap between the downlink transmission area (the section indicated by “DL” in FIGS. 1A and 1B) and the uplink transmission area (the section indicated by “UL” in FIGS. 1A and 1B) (FIGS. 1A and 1B). The Gap) that is arranged first in each 1ms time unit is set in consideration of the propagation delay time between the base station and the terminal and the processing time (UE processing time) of the terminal. Here, the processing time of the terminal refers to the processing time in which the terminal decodes DL data and generates a response signal (Ack) in the case of DL self-contained operation (FIG. 1A), and in the case of UL self-contained operation. (FIG. 1B), which refers to the processing time at which the terminal decodes the control signal (UL assignment) and generates UL data.

Further, the gap at the end of the uplink transmission area (Gap arranged second in each 1 ms time unit of FIGS. 1A and 1B) is set in consideration of the processing time of the base station (eNB processing time). .. Here, the processing time of the base station refers to the processing time in which the base station decodes the response signal and generates the scheduling and control signal (DL assignment) of the next time unit in the case of DL self-contained operation. In the case of self-contained operation, it refers to the processing time at which the base station decodes UL data and generates the next time unit scheduling and control signal (UL assignment).

The average latency of the time unit configuration shown in FIGS. 1A and 1B is estimated as follows.

Here, as shown in FIG. 2A, in the DL self-contained operation of FIG. 1A, the symbol length of DL assignment + DL data is 11 symbols, the symbol length of the first Gap is 1 symbol, and the symbol of ACK (response signal). Assume a time unit configuration of 14 symbols per msec, with a length of 1 symbol and a symbol length of the second Gap of 1 symbol.

At this time, the average delay time from the generation of the transmission buffer of the base station to the reception of the response signal for the downlink data from the terminal by the base station is 14/2 symbol (average time from buffer generation to downlink data allocation) + 13symbol (time from downlink data allocation to ACK reception) = 20symbol.

Further, as shown in FIG. 2B, in the UL self-contained operation of FIG. 1B, the symbol length of UL assignment is 1 symbol, the symbol length of the first Gap is 1 symbol, the symbol length of UL data is 11 symbol, and the symbol length of the second Gap is 1. Assume a time unit configuration with a symbol length of 1 symbol and 14 symbols per 1 msec.

At this time, the average delay time from the generation of the terminal transmission buffer to the completion of the first uplink data transmission is 14/2 symbol (average time from buffer generation to the next uplink data transmission) + 14 symbol. (Time for making a scheduling request for uplink data) + 13 symbol (Time for the terminal to receive radio resource allocation information and complete transmission of uplink data) = 34 symbol.

Further, in the assumptions shown in FIGS. 2A and 2B, the overhead of the gap section of the time unit configuration is 2/14 = 14% in both FIGS. 1A and 1B.

Further, the processing time allowed in the assumed time unit configuration shown in FIGS. 2A and 2B is 1 symbol for the terminal and 1 symbol for the processing time of the base station in both FIGS. 1A and 1B.

In the time unit configuration of FIGS. 1A and 1B, by providing a gap section at the end of the time unit in consideration of the processing time of the base station, data can be retransmitted in the next time unit, so that the data communication is delayed. Can be reduced.

However, regarding the time unit configuration used for the Self-contained operation shown in FIGS. 1A and 1B, the control using the HARQ process has not been sufficiently studied. Therefore, depending on the settings of the HARQ process, when multiple HARQ processes are applied in each time unit, the overhead of the gap interval may increase, the average delay time may increase, or the processing time allowed for the terminal and base station may increase. There is a risk of performance deterioration such as shortening of.

Therefore, one aspect of the present disclosure is to improve the above-mentioned performance by a time unit configuration for self-contained operation in consideration of the HARQ process.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[Outline of communication system]
The communication system that performs the DL Self-contained operation according to each embodiment of the present disclosure includes a base station 100 and a terminal 200. Further, the communication system that performs the UL Self-contained operation according to each embodiment of the present disclosure includes a base station 300 and a terminal 400.

In the following, the TDD system will be described as a premise. However, one aspect of the present disclosure can be similarly applied to an FDD system as described below.

Further, one eNB may have both the configurations of the base station 100 and the base station 300, or may have the configuration of either one. Similarly, one UE may have both a terminal 200 and a terminal 400 configuration, or may have either configuration.

FIG. 3 is a block diagram showing a main configuration of base stations 100 and 300 according to each embodiment of the present disclosure. In the base stations 100 and 300 shown in FIG. 3, the transmission unit 109 is a time unit composed of a downlink transmission area, an uplink transmission area, and a gap section which is a switching point from the downlink transmission area to the uplink transmission area. , The downlink signal is transmitted in the downlink transmission area, and the receiving unit 111 receives the uplink signal in the uplink transmission area in the time unit.

FIG. 4 is a block diagram showing a main configuration of terminals 200 and 400 according to each embodiment of the present disclosure. In the terminals 200 and 400 shown in FIG. 4, the receiving unit 202 performs downlink transmission in a time unit including a downlink transmission area, an uplink transmission area, and a gap section which is a switching point from the downlink transmission area to the uplink transmission area. The downlink signal is received in the region, and the transmission unit 212 transmits the uplink signal in the uplink transmission region in the time unit.

Here, each time unit includes the downlink transmission area and the uplink transmission area for a plurality of HARQ processes, respectively.

(Embodiment 1)
[Base station configuration (when DL Self-contained is operating)]
FIG. 5 is a block diagram showing a configuration of a base station 100 that performs a DL Self-contained operation according to the present embodiment. In FIG. 5, the base station 100 includes a time unit configuration storage unit 101, a scheduling unit 102, a control signal generation unit 103, a control signal modulation unit 104, a data coding unit 105, a retransmission control unit 106, and data. It has a modulation unit 107, a signal allocation unit 108, a transmission unit 109, an antenna 110, a reception unit 111, a signal extraction unit 112, a demodulation / decoding unit 113, and a determination unit 114.

The base station 100 shown in FIG. 5 is a time unit (Self-) composed of a "downlink transmission area", an "uplink transmission area", and a "gap section" which is a switching point from the downlink transmission area to the uplink transmission area. In the contained time unit), DL assignment and DL data are transmitted in the downlink transmission area. Further, the base station 100 receives a response signal (which may further include UCI) including ACK / NACK transmitted from the terminal 200 in the uplink transmission area in the time unit.

In the base station 100, the time unit configuration storage unit 101 stores in advance a time unit configuration including a plurality of HARQ processes. In the case of the DL self-contained time unit, the time unit configuration storage unit 101 arranges signals in each area of the downlink transmission area (including DL assignment and DL data), the gap interval (Gap), and the uplink transmission area (including ACK). Is stored for each HARQ process number (HARQ process). Then, the time unit configuration storage unit 101 outputs the stored time unit configuration to the scheduling unit 102. The details of the time unit configuration including the plurality of HARQ processes stored in the time unit configuration storage unit 101 will be described later.

The scheduling unit 102 refers to the terminal 200 with scheduling information regarding DL assignment and DL data in the DL Self-contained time unit (for example, ID of the assigned terminal, resource information allocated to the terminal 200 (frequency, time, code resource), Determine the DL data modulation / coding method, response signal allocation resource information, retransmission control information (New data Indicator, Redundancy Version, etc.), etc.

Further, the scheduling unit 102 allocates time resources in the time unit based on the DL assignment, DL data, Gap, and ACK signal allocation for each HARQ process number in the time unit output from the time unit configuration storage unit 101. decide. Further, the scheduling unit 102 applies an arbitrary HARQ process number when allocating a new packet to the terminal 200, and applies the HARQ process number at the time of the previous transmission when allocating the retransmission packet to the terminal 200.

Here, the number of HARQ processes applied in one time unit is determined by the scheduling unit 102 according to a predetermined rule. For example, the scheduling unit 102 determines the number of HARQ processes in consideration of the DL data size of the allocation terminal and the like. The update frequency of the number of HARQ processes is updated semi-statically in consideration of the transmission buffer size information of the accommodating terminal, and the determined number of HARQ processes is notified to the terminal 200 using the broadcast channel. May be good. Alternatively, the number of HARQ processes may be dynamically updated (for each time unit) and notified to the terminal 200 using DL assignment. Alternatively, the number of HARQ processes may be a fixed value predetermined by the specifications.

Since each signal arrangement of each HARQ process number is fixed in the time unit, the terminal 200 (reception side) can uniquely grasp the HARQ process number from the signal arrangement in the time unit if the time unit is synchronized. it can. Therefore, it is not necessary for the base station 100 to include the HARQ process number in the DL assignment and notify the terminal 200.

The scheduling unit 102 outputs the scheduling information to the control signal generation unit 103, the data coding unit 105, the signal allocation unit 108, and the signal extraction unit 112.

The control signal generation unit 103 generates a control signal (DL assignment) for the terminal 200. The DL assignment includes cell-specific upper layer signals, group or RAT-specific upper layer signals, terminal-specific upper layer signals, DL data allocation resource information, response signal allocation resource information, retransmission control information, and the like. included. The allocation resources (frequency, time, code) of the response signal may be set in advance from the base station 100 to the terminal 200 by higher layer notification or the like. Further, when the allocation resource of the response signal is indirectly determined from the allocation resource such as DL data according to a predetermined rule, the allocation resource information of the response signal does not need to be included in the DL assignment signal. The control signal generation unit 103 generates a control information bit string using these control information, encodes the generated control information bit string, and outputs the encoded control signal to the control signal modulation unit 104.

The control signal modulation unit 104 modulates the DL assignment received from the control signal generation unit 103, and outputs the modulated DL assignment to the signal allocation unit 108.

The data coding unit 105 performs error correction coding on the DL data (transmission data) according to the coding method received from the scheduling unit 102, and outputs the encoded DL data to the retransmission control unit 106.

The retransmission control unit 106 holds the encoded DL data received from the data coding unit 105 at the time of the first transmission and outputs it to the data modulation unit 107. Further, the retransmission control unit 106 controls the retained data at the time of retransmission based on the determination result from the determination unit 114. Specifically, when the retransmission control unit 106 receives the NACK for the DL data, the retransmission control unit 106 outputs the corresponding holding data to the data modulation unit 107. When the retransmission control unit 106 receives the ACK for the DL data, the retransmission control unit 106 discards the corresponding retained data and ends the transmission of the DL data.

The data modulation unit 107 modulates the DL data received from the retransmission control unit 106, and outputs the modulated DL data to the signal allocation unit 108.

The signal allocation unit 108 maps the DL assignment received from the control signal modulation unit 104 and the DL data received from the data modulation unit 107 to the radio resources (allocation time, frequency, code resource) instructed by the scheduling unit 102. The signal allocation unit 108 outputs a downlink signal to which the signal is mapped to the transmission unit 109.

The transmission unit 109 performs RF (Radio Frequency) processing such as D / A (Digital-to-Analog) conversion and up-conversion on the signal received from the signal allocation unit 108, and wirelessly signals to the terminal 200 via the antenna 110. To send.

The receiving unit 111 performs RF processing such as down-conversion or A / D (Analog-to-Digital) conversion on the response signal waveform of the uplink signal received from the terminal 200 via the antenna 110, and obtains the result. The received signal is output to the signal extraction unit 112.

The signal extraction unit 112 extracts the radio resource portion to which the response signal from the terminal 200 is transmitted from the received signal based on the radio resources (allocated time, frequency, code resource) instructed by the scheduling unit 102, and receives the signal extraction unit 112. The response signal is output to the demodulation / decoding unit 113.

The demodulation / demodulation unit 113 performs equalization, demodulation, and decoding on the reception response signal received from the signal extraction unit 112, and outputs the decoded bit sequence to the determination unit 114.

The determination unit 114 determines whether the response signal for DL data transmitted from the terminal 200 indicates ACK or NACK for DL data based on the bit sequence input from the demodulation / decoding unit 113. To do. The determination unit 114 outputs the determination result (ACK or NACK) to the retransmission control unit 106.

[Terminal configuration (when DL Self-contained is operating)]
FIG. 6 is a block diagram showing a configuration of a terminal 200 that performs a DL Self-contained operation according to the present embodiment. In FIG. 6, the terminal 200 includes an antenna 201, a receiving unit 202, a time unit configuration storage unit 203, a signal extraction unit 204, a control signal demodulation / decoding unit 205, a data demodulation unit 206, and a data decoding unit 207. It has an error detection unit 208, a response signal generation unit 209, a coding / modulation unit 210, a signal allocation unit 211, and a transmission unit 212.

The terminal 200 shown in FIG. 6 is transmitted from the base station 100 in the downlink transmission area in a time unit (Self-contained time unit) composed of a “downlink transmission area”, a “gap section”, and an “uplink transmission area”. Receive DL assignment and DL data. Further, the terminal 200 transmits a response signal (which may further include UCI) including ACK / NACK for DL data in the uplink transmission area in the time unit.

In the terminal 200, the receiving unit 202 receives the DL assignment and DL data transmitted from the base station 100 via the antenna 201, performs RF processing such as down-conversion or AD conversion on the radio reception signal, and bases it. Get the band signal. The receiving unit 202 outputs the baseband signal to the signal extraction unit 204.

Similar to the time unit configuration storage unit 101 of the base station 100, the time unit configuration storage unit 203 stores in advance a time unit configuration including a plurality of HARQ processes. As described above, the number of HARQ processes applied in one time unit is determined by the base station 100 and may be notified in advance to the terminal 200. Alternatively, the number of HARQ processes may be a fixed value predetermined by the system. The time unit configuration storage unit 203 outputs the time unit configuration according to the number of applied HARQ processes to the signal extraction unit 204 and the signal allocation unit 211.

The signal extraction unit 204 extracts DL assignment and DL data for each HARQ process from the baseband signal received from the reception unit 202 based on the time unit configuration output from the time unit configuration storage unit 203, and controls the DL assignment. The signal is output to the signal demodulation / decoding unit 205, and the DL data is output to the data demodulation unit 206.

The control signal demodulation / decoding unit 205 blindly decodes the DL assignment received from the signal extraction unit 204, and attempts to decode the DL assignment addressed to its own machine. When the control signal demodulation / decoding unit 205 determines that the DL assignment is addressed to its own machine as a result of blind decoding, the scheduling information included in the DL assignment (for example, the allocation resource information of DL data or the response signal) (Allocated frequency, code resource, etc.) is output to the data demodulation unit 206 and the signal allocation unit 211.

The data demodulation unit 206 demodulates the DL data received from the signal extraction unit 204 based on the allocated resource information of the DL data received from the control signal demodulation / decoding unit 205, and outputs the demodulated DL data to the data decoding unit 207. To do.

The data decoding unit 207 decodes the DL data received from the data demodulation unit 206, and outputs the decoded DL data to the error detection unit 208.

The error detection unit 208 performs error detection by, for example, CRC on the DL data received from the data decoding unit 207, and outputs the error detection result (ACK or NACK) to the response signal generation unit 209. Further, the error detection unit 208 outputs DL data determined as no error as a result of error detection as received data.

The response signal generation unit 209 generates a response signal (bit sequence) for the received DL data using the error detection result (ACK or NACK) received from the error detection unit 208, and transmits the response signal to the coding / modulation unit 210. Output.

The coding / modulation unit 210 performs error correction coding on the response signal (bit sequence) received from the response signal generation unit 209, modulates the encoded bit sequence, and assigns the modulated symbol sequence to the signal. Output to unit 211.

The signal allocation unit 211 maps the signal received from the coding / modulation unit 210 to the allocation time resource according to the HARQ process number instructed from the time unit configuration storage unit 203. At this time, the signal allocation unit 211 maps the response signal to the allocated frequency / code resource included in the scheduling information instructed by the control signal demodulation / decoding unit 205.

The transmission unit 212 performs RF processing such as D / A conversion and up-conversion on the signal received from the signal allocation unit 211, and transmits a radio signal to the base station 100 via the antenna 201.

[Base station configuration (when UL Self-contained is operating)]
FIG. 7 is a block diagram showing a configuration of a base station 300 that performs a UL Self-contained operation according to the present embodiment. In FIG. 7, the base station 300 includes a time unit configuration storage unit 301, a scheduling unit 302, a control signal generation unit 303, a control signal modulation unit 304, a signal allocation unit 305, a transmission unit 109, and an antenna 110. , A receiving unit 111, a signal extraction unit 306, a data demodulation unit 307, a retransmission synthesis decoding unit 308, and an error detection unit 309.

The base station 300 shown in FIG. 7 transmits UL assignment in the downlink transmission area in a time unit (Self-contained time unit) composed of a “downlink transmission area”, a “gap section”, and an “uplink transmission area”. Further, the base station 300 receives UL data (which may further include UCI) transmitted from the terminal 400 in the uplink transmission area in the time unit.

In the base station 300, the time unit configuration storage unit 301 stores in advance a time unit configuration including a plurality of HARQ processes. In the case of the UL self-contained time unit, the time unit configuration storage unit 301 sets the signal arrangement in each area of the downlink transmission area (including UL assignment), the gap interval (Gap), and the uplink transmission area (including UL data) to HARQ. It is stored for each process number (HARQ process). Then, the time unit configuration storage unit 301 outputs the stored time unit configuration to the scheduling unit 302. The details of the time unit configuration including the plurality of HARQ processes stored in the time unit configuration storage unit 301 will be described later.

When the error detection result with an error for the previous UL data is input from the error detection unit 309, the scheduling unit 302 schedules the retransmission of UL data using the HARQ process number at the time of the previous transmission of the terminal 400. .. Further, when the error detection result without error for the previous UL data is input from the error detection unit 309, the scheduling unit 302 schedules a new packet for the terminal 400 to an arbitrary HARQ process number.

The scheduling unit 302 refers to the terminal 400 with scheduling information regarding UL assignment and UL data in the UL Self-contained time unit (for example, ID of the assigned terminal, resource information allocated to the terminal 400 (frequency, time, code resource), Determines UL data modulation / coding method, response signal allocation resource information, retransmission control information (New data Indicator, Redundancy Version, etc.).

Further, the scheduling unit 302 determines the time resource allocation in the time unit based on the UL assignment, Gap, and UL data signal allocation for each HARQ process number in the time unit output from the time unit configuration storage unit 301. ..

Here, the number of HARQ processes applied in one time unit is determined by the scheduling unit 302 according to the same method as that of the base station 100 (scheduling unit 102).

As with the base station 100, since each signal arrangement of each HARQ process number is fixed in the time unit, the terminal 400 (reception side) can perform HARQ from the signal arrangement in the time unit if the time unit is synchronized. The process number can be uniquely grasped. Therefore, it is not necessary for the base station 300 to include the HARQ process number in the UL assignment and notify the terminal 400.

The scheduling unit 302 outputs the scheduling information to the control signal generation unit 303, the signal allocation unit 305, and the signal extraction unit 306.

The control signal generation unit 303 generates a control signal (UL assignment) for the terminal 400. The UL assignment includes a cell-specific upper layer signal, a group or RAT-specific upper layer signal, a terminal-specific upper layer signal, UL data allocation resource information, retransmission control information, and the like. The control signal generation unit 303 generates a control information bit string using these control information, encodes the generated control information bit string, and outputs the encoded control signal to the control signal modulation unit 304.

The control signal modulation unit 304 modulates the UL assignment received from the control signal generation unit 303, and outputs the modulated UL assignment to the signal allocation unit 305.

The signal allocation unit 305 maps the UL assignment received from the control signal modulation unit 304 to the radio resources (allocation time, frequency, code resource) for each HARQ process number instructed by the scheduling unit 302. The signal allocation unit 305 outputs a downlink signal to which the signal is mapped to the transmission unit 109.

The transmitting unit 109, the antenna 110, and the receiving unit 111 operate in the same manner as the transmitting unit 109, the antenna 110, and the receiving unit 111 included in the base station 100.

Based on the radio resources (allocated time, frequency, code resource) instructed by the scheduling unit 302, the signal extraction unit 306 selects the radio resource portion to which UL data from the terminal 400 is transmitted from the received signal for each HARQ process number. And outputs the received UL data to the data demodulation unit 307.

The data demodulation unit 307 performs equalization and demodulation processing on the UL data received from the signal extraction unit 306, and outputs the demodulated UL data to the retransmission synthesis decoding unit 308.

When the retransmission synthesis decoding unit 308 holds the UL data of the HARQ process number to be decoded in the terminal 400 (when the UL data is the retransmission data), the holding UL data and the UL output from the data demodulation unit 307 Data is synthesized according to a predetermined HARQ synthesis method such as CC (Chase Combining) or IR (Incremental Redundancy), and the UL data after synthesis is subjected to decoding processing. When the retransmission synthesis decoding unit 308 does not hold the UL data of the HARQ process number of the terminal 400 (when the UL data is the first packet), the retransmission synthesis decoding process performs the decoding process without performing the UL data synthesis process. Then, the retransmission synthesis decoding unit 308 outputs the decrypted UL data to the error detection unit 309. Further, the retransmission synthesis / decoding unit 308 deletes the UL data of the HARQ process number held by the terminal 400 when the detection result from the error detection unit 309 is no error.

The error detection unit 309 performs error detection by, for example, CRC on the UL data received from the retransmission synthesis / decoding unit 308, and outputs the error detection result (ACK or NACK) to the scheduling unit 302 and the retransmission synthesis / decoding unit 308. Further, the error detection unit 309 outputs UL data determined as no error as a result of error detection as received data.

[Terminal configuration (when UL Self-contained is operating)]
FIG. 8 is a block diagram showing a configuration of a terminal 400 that performs a UL Self-contained operation according to the present embodiment. In FIG. 8, the terminal 400 includes an antenna 201, a receiving unit 202, a time unit configuration storage unit 401, a signal extraction unit 402, a control signal demodulation / decoding unit 403, a data coding unit 404, and a retransmission control unit. It has a 405, a data modulation unit 406, a signal allocation unit 407, and a transmission unit 212.

The terminal 400 shown in FIG. 8 is transmitted from the base station 300 in the downlink transmission area in a time unit (Self-contained time unit) composed of a “downlink transmission area”, a “gap section”, and an “uplink transmission area”. Receive UL assignment. Further, the terminal 400 transmits UL data (which may further include UCI) in the uplink transmission area in the time unit.

In the terminal 400, the antenna 201 and the receiving unit 202 operate in the same manner as the antenna 201 and the receiving unit 202 included in the terminal 200.

Similar to the time unit configuration storage unit 301 of the base station 300, the time unit configuration storage unit 401 stores in advance a time unit configuration including a plurality of HARQ processes. As described above, the number of HARQ processes applied in one time unit is determined by the base station 300 and may be notified in advance to the terminal 400. Alternatively, the number of HARQ processes may be a fixed value predetermined by the system. The time unit configuration storage unit 401 outputs the time unit configuration according to the number of applied HARQ processes to the signal extraction unit 402 and the signal allocation unit 407.

The signal extraction unit 402 extracts the UL assignment for each HARQ process from the baseband signal received from the reception unit 202 based on the time unit configuration output from the time unit configuration storage unit 401, and demodulates the UL assignment as a control signal. Output to the decoding unit 403.

The control signal demodulation / decoding unit 403 blindly decodes the UL assignment received from the signal extraction unit 402, and attempts to decode the UL assignment addressed to its own machine. When the control signal demodulation / decoding unit 403 determines that the UL assignment is addressed to the own machine as a result of blind decoding, the scheduling information included in the UL assignment is converted into the data coding unit 404, the retransmission control unit 405, and the signal allocation unit. Output to 407.

The data coding unit 404 performs error correction coding on UL data (transmission data) according to the coding method included in the UL assignment received from the control signal demodulation / decoding unit 403, and retransmits the encoded UL data. Output to control unit 405.

The retransmission control unit 405 determines whether the UL data is the first packet or the retransmission packet based on the New data indicator included in the UL assignment received from the control signal demodulation / decoding unit 403. In the case of the first packet, the retransmission control unit 405 holds the encoded UL data received from the data coding unit 404 and outputs it to the data modulation unit 406. Further, in the case of the first packet, the retransmission control unit 405 determines that the transmission / reception of the previous transmission packet was successful, and discards the retained data of the corresponding HARQ process number. On the other hand, in the case of a retransmission packet, the retransmission control unit 405 extracts the transmission data instructed by the retransmission control information (Redundancy Version) included in the UL assignment from the retained data of the corresponding HARQ process number, and sends it to the data modulation unit 406. Output.

The data modulation unit 406 modulates the UL data received from the retransmission control unit 405 and outputs the modulated UL data to the signal allocation unit 407.

The signal allocation unit 407 maps UL data received from the data modulation unit 406 to radio resources (frequency / code resources) included in the UL assignment received from the control signal demodulation / decoding unit 403. At this time, the signal allocation unit 407 maps UL data to the allocation time resource according to the HARQ process number instructed by the time unit configuration storage unit 401. The signal allocation unit 407 outputs an uplink signal to which the signal is mapped to the transmission unit 212.

The transmission unit 212 operates in the same manner as the transmission unit 212 included in the terminal 200.

[Operation of base stations 100, 300 and terminals 200, 400]
The operations of the base stations 100 and 300 and the terminals 200 and 400 having the above configurations will be described in detail.

Time unit configuration A feature common to the time unit configurations stored in the storage units 101, 203, 301, and 401 is a time unit composed of a "downlink transmission area", a "gap section", and an "uplink transmission area". In (Self-contained time unit), "DL assignment and DL data and ACK (response signal to DL data)" or "UL assignment and UL data" corresponding to each of multiple HARQ process numbers in one time unit. Is to include the signal set of.

That is, in the present embodiment, each time unit includes a downlink transmission area and an uplink transmission area for a plurality of HARQ processes, respectively. Specifically, in the case of DL self-contained time unit, a plurality of "DL assignment, DL data, and ACK (response signal to DL data)" signal sets corresponding to a certain HARQ process number are included in one time unit. .. In the case of UL self-contained time unit, a plurality of "UL assignment and UL data" signal sets corresponding to a certain HARQ process number are included in one time unit.

Further, in the time unit, the signal arrangement of each signal (“DL assignment and DL data and ACK (response signal to DL data)” or “UL assignment and UL data”) is fixed. That is, in the time unit, the arrangement position of the downlink transmission area and the arrangement position of the uplink transmission area are fixed for each of the plurality of HARQ processes. In other words, within the time unit, the data (DL data, UL data) retransmission timing is fixed according to the HARQ process number.

On the other hand, the data (DL data, UL data) can be resent in any time unit. That is, in the present embodiment, the transmission timing in the time unit is fixed according to the HARQ process (HARQ process number) for the data (DL data, UL data), whereas it is between the time units. Transmission timing (including retransmission timing) is not fixed.

Here, the "time unit" defines the signal arrangement (transmission timing) of "DL assignment, DL data, and ACK (response signal to DL data)" or "UL assignment and UL data" for each HARQ process number. Refers to the time unit. Alternatively, the "time unit" may be defined as one LTE subframe (1ms). Alternatively, the "time unit" may be defined as a time unit having a subcarrier interval of 15 kHz and including 14 symbols (a predetermined fixed number). Alternatively, the "time unit" may be defined as a time unit including 14 symbols (a predetermined fixed number) regardless of the subcarrier interval.

Hereinafter, detailed features of the time unit configurations 1 to 3 stored in the time unit configuration storage units 101, 203, 301, 401 in the base stations 100, 300 and the terminals 200, 400 will be described.

<Time unit configuration 1 (Fig. 9A, Fig. 9B)>
The time unit configuration 1 defines only one switching point (gap section) from the “downstream transmission area” to the “uplink transmission area” in the time unit. For example, the gap length of the gap section is set in consideration of the propagation delay between the base stations 100 and 300 and the terminals 200 and 400.

9A and 9B show an example of a time unit configuration having two HARQ processes. FIG. 9A shows an example of time unit configuration during DL self-contained operation, and FIG. 9B shows an example of time unit configuration during UL self-contained operation.

As shown in FIG. 9A, in the case of the DL self-contained time unit, the response signal (called ACK # 2) of HARQ process number 2 (process 2) is arranged at the end of the time unit. That is, in FIG. 9A, instead of the gap interval (gap) arranged at the end of the time unit to secure the processing time of the eNB as shown in FIG. 1A, the uplink transmission area (response) of one HARQ process number is used. Signal) is placed.

As a result, the decoding process of the response signal (ACK # 1) of the HARQ process number 1 (process 1) in the eNB (base station 100) and the scheduling process of the next time unit are performed by the HARQ process number 2 (process 2). It can be executed in the transmission time of ACK # 2, which is the uplink transmission area. Therefore, in FIG. 9A, DL data can be retransmitted in the next time unit while eliminating the gap section at the end of the time unit as shown in FIG. 1A.

Further, as shown in FIG. 9B, in the case of the UL self-contained time unit, UL data (called UL data # 2) of HARQ process number 2 (process 2) is arranged at the end of the time unit. That is, in FIG. 9B, instead of the gap interval (gap) arranged at the end of the time unit to secure the processing time of the eNB as shown in FIG. 1B, the uplink transmission area (UL) of one HARQ process number is used. data) is placed.

As a result, the decryption process of UL data (called UL data # 1) of HARQ process number 1 (process 1) in the eNB (base station 300) and the scheduling process of the next time unit are performed by HARQ process number 2 (process). It can be executed in the transmission time of UL data # 2, which is the uplink transmission area of 2). Therefore, in FIG. 9B, UL data can be retransmitted in the next time unit while eliminating the gap section at the end of the time unit as shown in FIG. 1B.

In this way, the terminals 200 and 400 that use the HARQ process of any one of the plurality of HARQ processes in the time unit are arranged between the downlink transmission area and the uplink transmission area corresponding to the HARQ process. The transmission area corresponding to the process is used as the processing time for the HARQ process.

10A and 10B show the correspondence of each signal of each HARQ process in the time unit configuration 1 (FIGS. 9A and 9B). In FIGS. 10A and 10B, the solid line arrow indicates the correspondence relationship of each signal of HARQ process number 1, and the broken line arrow indicates the correspondence relationship of each signal of HARQ process number 2.

For example, in FIG. 10A, when ACK # 1 for DL data # 1 (signal transmitted by “DL assignment + data HARQ process 1” in FIG. 10A) of HARQ process number 1 of a certain time unit is NACK, the base station. 100 schedules the retransmission of DL data in DL assignment # 1 (the signal transmitted in “DL assignment + data HARQ process 1” in FIG. 10A) of the next time unit. The same applies to the signal of HARQ process number 2.

Further, for example, in FIG. 10B, when the decoding result of UL data # 2 (signal transmitted by “UL data HARQ process 2” in FIG. 10B) of HARQ process number 2 of a certain time unit is NACK, the base station 300 Schedules the retransmission of UL data # 2 at UL assignment # 2 (the signal transmitted in “Assignment 2” in FIG. 10B) of the next time unit. The same applies to the signal of HARQ process number 1.

The average latency of the time unit configuration shown in FIGS. 9A and 9B is estimated as follows.

In FIG. 9A (DL self-contained time unit), a time unit configuration having a symbol length of each signal of the DL self-contained time unit shown in FIG. 2A is assumed. Further, in FIG. 9B (UL self-contained time unit), a time unit configuration having a symbol length of each signal of the UL self-contained time unit shown in FIG. 2B is assumed.

In FIG. 9A, the average delay time from the generation of the transmission buffer of the base station 100 until the base station 100 receives the response signal for the downlink data from the terminal 200 (the average value of the average delay times of HARQ process numbers 1 and 2). Is (8/2 + 13) * (8/14) + (6/2 + 8) * (6/14) = 14.4 symbol. Therefore, in FIG. 9A, the average delay time is reduced as compared with the average delay time (20 symbols) of the time unit shown in FIG. 1A.

In FIG. 9B, the average delay time (the average value of the average delay times of HARQ process numbers 1 and 2) from the generation of the transmission buffer of the terminal 400 to the completion of the transmission of the first uplink data by the terminal 400 is (8). / 2 + 14 + 9) * (8/14) + (6/2 + 14 + 13) * (6/14) = 28.3 symbol. Therefore, in FIG. 9B, the average delay time is reduced as compared with the average delay time (34 symbols) of the time unit shown in FIG. 1B.

Further, in the assumptions shown in FIGS. 2A and 2B, the overhead of the gap section of the time unit configuration is 1/14 = 7% in both FIGS. 9A and 9B. Therefore, in the time unit configurations of FIGS. 9A and 9B, the overhead of the gap section is reduced as compared with the time unit configurations of FIGS. 1A and 1B.

Further, in the DL Self-contained operation, as shown in FIG. 9A, the processing time of the terminal 200 allowed by the assumed time unit configuration shown in FIGS. 2A and 2B is 5 symbols for each of HARQ process numbers 1 and 2. , 1 symbol. Therefore, in FIG. 9A, the processing time of the HARQ process number 1 of the terminal 200 can be extended as compared with the processing time (1 symbol) of the terminal in FIG. 1A.

Further, as shown in FIG. 9A, the processing time of the base station 100 allowed by the assumed time unit configuration shown in FIGS. 2A and 2B is 1 symbol and 6 symbols for each of the HARQ process numbers 1 and 2, respectively. Therefore, in FIG. 9A, the processing time of HARQ process number 2 of the base station 100 can be extended as compared with the processing time (1 symbol) of the base station in FIG. 1A.

Similarly, in the UL Self-contained operation, as shown in FIG. 9B, the processing time of the terminal 400 allowed in the assumed time unit configuration shown in FIGS. 2A and 2B is set for each of HARQ process numbers 1 and 2. It becomes 1 symbol and 6 symbol. Therefore, in FIG. 9B, the processing time of the HARQ process number 2 of the terminal 400 can be extended as compared with the processing time (1 symbol) of the terminal in FIG. 1B.

Further, as shown in FIG. 9B, the processing time of the base station 300 allowed by the assumed time unit configuration shown in FIGS. 2A and 2B is 5 symbols and 1 symbols for HARQ process numbers 1 and 2, respectively. Therefore, in FIG. 9B, the processing time of HARQ process number 1 of the base station 300 can be extended as compared with the processing time (1 symbol) of the base station in FIG. 1B.

As described above, in the time unit configuration 1 (FIGS. 9A and 9B), each time unit has the same HARQ process number "DL assignment and DL data and response signal (response signal to DL data)" or "UL assignment. It is configured to include multiple UL data "signal sets. Further, in the time unit configuration 1, only one switching point (gap section) from the “downstream transmission area” to the “uplink transmission area” is defined in each time unit. Further, in the time unit configuration 1, the uplink transmission area is arranged at the end of the time unit, and the gap section is not arranged.

As a result, in the time unit configuration 1, the overhead of the gap section can be reduced and the average delay time can be shortened as compared with the time units shown in FIGS. 1A and 1B. Further, according to the time unit configuration 1, the effect that the processing time allowed for the base stations 100, 300 and the terminals 200, 400 can be extended can be obtained. Further, according to the time unit configuration 1, the data signal transmitted in one time unit can be retransmitted in the next time unit.

<Time unit configuration 2 (Fig. 11)>
Similar to the time unit configuration 1 (FIG. 9A), the time unit configuration 2 defines only one switching point (gap section) from the “downlink transmission region” to the “uplink transmission region” in the time unit.

Further, in the time unit configuration 2, the uplink transmission area corresponding to at least one HARQ process (HARQ process number) among the plurality of HARQ processes in the time unit (DL self-contained time unit) during DL Self-contained operation. Is placed earlier than the downlink transmission area corresponding to the HARQ process. That is, the response signal is transmitted before DL assignment and DL data in the time unit.

FIG. 11 shows an example of a time unit configuration during DL self-contained operation when the number of HARQ processes is two.

As shown in FIG. 11, in the case of the DL self-contained time unit, in each time unit, the uplink transmission area (response signal (ACK # 2)) of HARQ process number 2 is the downlink transmission area (DL) of HARQ process number 2. It is assigned at the timing before assignment + data HARQ process 2 (DL assignment # 2, DL data # 2).

As a result, the decoding process of DL assignment # 2 and DL data # 2 of HARQ process number 2 of the terminal 200 is performed by the transmission time of DL assignment # 1 and DL data # 1 of the next time unit (DL assignment + data HARQ process 1). ) Can be executed. In FIG. 11, the processing time of HARQ process number 2 of the terminal 200 is secured as 7 symbols. Therefore, in FIG. 11, the processing time of the HARQ process number 2 of the terminal 200 can be extended as compared with the processing time (1 symbol) of the terminal in FIG. 1A.

As described above, in the time unit configuration 2 (FIG. 11), each time unit includes a plurality of signal sets of "DL assignment, DL data, and response signal (response signal to DL data)" having the same HARQ process number. It is composed. Further, in each time unit, the response signal (uplink transmission area) is arranged at a timing before DL assignment and DL data (downlink transmission area) for at least one HARQ process.

As a result, in the time unit configuration 2, the effect that the processing time allowed for the terminal 200 can be extended can be obtained as compared with the time unit shown in FIG. 1A. Further, in the time unit configuration 2, the overhead of the gap section can be reduced and the average delay time can be shortened as in the time unit configuration 1. Further, according to the time unit configuration 2, as in the time unit configuration 1, the data signal transmitted in a certain time unit can be retransmitted in the next time unit.

<Time unit configuration 3 (FIG. 12A, FIG. 12B)>
The time unit configuration 3 is characterized in that the number of switching points (gap sections) from the “downstream transmission area” to the “uplink transmission area” is equal to the number of HARQ processes used in the time unit.

12A and 12B show an example of a time unit configuration having two HARQ processes. FIG. 12A shows an example of time unit configuration during DL self-contained operation, and FIG. 12B shows an example of time unit configuration during UL self-contained operation.

As shown in FIG. 12A, in the case of the DL self-contained time unit, the signal set of HARQ process number 1 (DL assignment # 1, DL data # 1, ACK # 1) is arranged in the first half of the time unit, and the time unit The signal set of HARQ process number 2 (DL assignment # 2, DL data # 2, ACK # 2) is placed in the latter half. That is, the uplink transmission area of HARQ process number 2 is arranged at the end of the time unit.

As a result, the decoding process of ACK # 1 and the scheduling process of the next time unit for the HARQ process number 1 in the eNB (base station 100) are the transmission of the signal set which is the downlink transmission area and the uplink transmission area of the HARQ process number 2. It will be feasible in time. Therefore, in FIG. 12A, DL data # 1 can be retransmitted in the next time unit while eliminating the gap section at the end of the time unit (the section for securing the processing time of eNB) as shown in FIG. 1A. Become. The same applies to the signal of HARQ process number 2.

Further, as shown in FIG. 12B, in the case of the UL self-contained time unit, the signal set of HARQ process number 1 (UL assignment # 1, UL data # 1) is arranged in the first half of the time unit, and the signal set (UL assignment # 1, UL data # 1) is arranged in the second half of the time unit. The signal set of HARQ process number 2 (UL assignment # 2, UL data # 2) is placed. That is, the uplink transmission area of HARQ process number 2 is arranged at the end of the time unit.

As a result, the decoding process of UL data # 1 and the scheduling process of the next time unit for the HARQ process number 1 in the eNB (base station 300) are performed by the signal set in the downlink transmission area and the uplink transmission area of the HARQ process number 2. It can be executed in the transmission time. Therefore, in FIG. 12B, UL data # 1 can be retransmitted in the next time unit while eliminating the gap section at the end of the time unit (the section for securing the processing time of eNB) as shown in FIG. 1B. Become. The same applies to the signal of HARQ process number 2.

As described above, each time unit shown in FIGS. 12A and 12B includes the same number of gap intervals as the number (2) of the plurality of HARQ processes. Further, in each time unit, the gap section is arranged between the downlink transmission area and the uplink transmission area for each of the plurality of HARQ processes.

The average latency of the time unit configuration shown in FIGS. 12A and 12B is estimated as follows.

In FIG. 12A (DL self-contained time unit), a time unit configuration having a symbol length of each signal of the DL self-contained time unit shown in FIG. 2A is assumed. Further, in FIG. 12B (UL self-contained time unit), a time unit configuration having a symbol length of each signal of the UL self-contained time unit shown in FIG. 2B is assumed.

In FIG. 12A, the average delay time from the generation of the transmission buffer of the base station 100 until the base station 100 receives the response signal for the downlink data from the terminal 200 is the average delay time of HARQ process numbers 1 and 2 as well as (1). 7/2 + 7) = 10.5 symbol. Therefore, in FIG. 12A, the average delay time is reduced as compared with the average delay time (20 symbols) of the time unit shown in FIG. 1A.

In FIG. 12B, the average delay time from the generation of the transmission buffer of the terminal 400 to the completion of the transmission of the first uplink data by the terminal 400 is (7/2 +) for both the average delay times of HARQ process numbers 1 and 2. 14 + 7) = 24.5 symbol. Therefore, in FIG. 12B, the average delay time is reduced as compared with the average delay time (34 symbols) of the time unit shown in FIG. 1B.

Further, in FIGS. 12A and 12B, the processing time of the base station 100 allowed by the assumed time unit configuration shown in FIGS. 2A and 2B is 7 symbols for both HARQ process numbers 1 and 2. Therefore, in the time unit configuration of FIGS. 12A and 12B, both HARQ process numbers 1 and 2 of the base stations 100 and 300 are compared with the processing time (1 symbol) of the base station in the time unit configuration of FIGS. 1A and 1B. Processing time can be extended.

In the assumptions shown in FIGS. 2A and 2B, the overhead of the gap section of the time unit configuration shown in FIGS. 12A and 12B and the processing time of the terminals 200 and 400 are the same as those in FIGS. 1A and 1B.

As described above, in the time unit configuration 3 (FIGS. 12A and 12B), each time unit has the same HARQ process number "DL assignment and DL data and response signal (response signal to DL data)" or "UL assignment. It is configured to include multiple UL data "signal sets. Further, in the time unit configuration 3, the uplink transmission area is arranged at the end of the time unit, and the gap section is not arranged. Further, in each time unit, the number of switching points (gap intervals) from the “downstream transmission area” to the “upstream transmission area” is made equal to the number of HARQ processes applied in the time unit.

As a result, in the time unit configuration 3, the average delay time can be shortened as compared with the time units shown in FIGS. 1A and 1B. Further, according to the time unit configuration 3, the effect of extending the processing time allowed for the base stations 100 and 300 can be obtained. Further, according to the time unit configuration 3, as in the time unit configuration 1, the data signal transmitted in a certain time unit can be retransmitted in the next time unit.

The DL self-contained time unit shown in FIG. 12A and the UL self-contained time unit shown in FIG. 12B may have the same switching timing from the “upstream transmission area” to the “downstream transmission area”. By doing so, for example, as shown in FIG. 13, it is possible to switch between the DL self-contained time unit and the UL self-contained time unit at shorter time intervals than the time unit. In FIG. 13, the DL self-contained time unit is arranged in the first half of each time unit, and the UL self-contained time unit is arranged in the latter half of each time unit. This makes it possible to efficiently allocate radio resources when the traffic volume between DL and UL is uneven.

The time unit configurations 1 to 3 have been described above.

As described above, in the present embodiment, each time unit includes a downlink transmission area and an uplink transmission area for a plurality of HARQ processes, respectively, and performs a Self-contained operation using a time unit configuration in consideration of the HARQ process. be able to. In this way, the time unit configuration for self-contained operation in consideration of the HARQ process suppresses the increase in the overhead of the gap section and the increase in the average delay time, and is allowed by the terminals 200, 400 and the base stations 100, 300. It is possible to improve performance such as extending the processing time.

(Embodiment 2)
The present embodiment is characterized in that the HARQ process (HARQ process number) used by the UE is determined from a plurality of HARQ processes in the time unit according to the processing capacity of the UE.

[Base station configuration (when DL self-contained is operating)]
The configuration of the base station 100 that performs the DL self-contained operation according to the present embodiment is the same as that of the first embodiment (FIG. 5), but the operation of the scheduling unit 102 is different.

Specifically, the scheduling unit 102 determines the scheduling information regarding DL assignment and DL data in the DL self-contained time unit for the terminal 200. The scheduling unit 102 determines the time resource allocation in the time unit based on the arrangement (transmission timing) of the signal set for each HARQ process number in the time unit output from the time unit configuration storage unit 101.

Here, the scheduling unit 102 determines the HARQ process number (time resource) to be assigned to the terminal 200 in the time unit according to the processing capacity of the terminal 200 at the time of transmitting a new packet. Here, the processing capacity of the terminal 200 may be obtained from, for example, the UE category (User Equipment Category) defined by 3GPP notified when the base station 100 and the terminal 200 are connected. Other operations of the scheduling unit 102 are the same as those in the first embodiment. The details of the method of allocating the HARQ process number in the time unit according to the processing capacity of the terminal 200 in the scheduling unit 102 will be described later.

[Terminal configuration (when DL self-contained is operating)]
The configuration of the terminal 200 that performs the DL self-contained operation according to the present embodiment is the same as that of the first embodiment (FIG. 6), but the operation of the signal extraction unit 204 is different.

Specifically, the signal extraction unit 204 sets the HARQ process number according to the processing capacity of the own terminal from the baseband signal received from the reception unit 202 based on the time unit configuration output from the time unit configuration storage unit 203. Extract DL assignment and DL data. Other operations of the signal extraction unit 204 are the same as those in the first embodiment.

Here, the method of determining the HARQ process number (time resource) assigned by the signal extraction unit 204 according to the processing capacity of the own terminal is the same as that of the base station 100 (scheduling unit 102). The method for determining the HARQ process number may be specified in the specifications, or may be notified in advance from the base station 100 to the terminal 200 using the broadcast channel.

[Base station configuration (when UL self-contained is operating)]
The configuration of the base station 300 that performs the UL self-contained operation according to the present embodiment is the same as that of the first embodiment (FIG. 7), but the operation of the scheduling unit 302 is different.

Specifically, when transmitting a new packet, the scheduling unit 302 schedules the packet of the terminal 400 to the HARQ process number corresponding to the processing capacity of the terminal 400. Other operations of the scheduling unit 302 are the same as those in the first embodiment. The details of the method of allocating the HARQ process number in the time unit according to the processing capacity of the terminal 400 in the scheduling unit 302 will be described later.

[Terminal configuration (when UL self-contained is operating)]
The configuration of the terminal 400 that performs the UL self-contained operation according to the present embodiment is the same as that of the first embodiment (FIG. 8), but the operation of the signal extraction unit 402 is different.

Specifically, the signal extraction unit 402 uses the baseband signal received from the reception unit 202 to obtain the HARQ process number according to the processing capacity of the own terminal based on the time unit configuration output from the time unit configuration storage unit 401. Extract UL assignment. Other operations of the signal extraction unit 402 are the same as those in the first embodiment.

Here, the method of determining the HARQ process number (time resource) assigned by the signal extraction unit 402 according to the processing capacity of the own terminal is the same as that of the base station 300 (scheduling unit 302).

[How to determine the HARQ process number]
Next, a method of determining the HARQ process number according to the processing capacity of the terminals 200 and 400 in the scheduling units 102 and 302 of the base stations 100 and 300 will be described.

When a plurality of signal sets of "DL assignment and DL data and response signal (response signal to DL data)" or "UL assignment and UL data" having the same HARQ process number are included in the time unit, the case described in the first embodiment. As in time unit configuration 1 (see FIGS. 9A, 9B) or time unit configuration 2 (see FIG. 11), the processing time allowed for the UE may vary depending on the HARQ process number.

Therefore, in the present embodiment, paying attention to the above characteristics, the scheduling units 102 and 302 are HARQ processes having a long allowable processing time for terminals 200 and 400 (for example, UE categories 1 to 4) having low processing capacity. Determine the HARQ process number, limited to the number. On the other hand, the scheduling units 102 and 302 determine an arbitrary HARQ process number for the terminals 200 and 400 (for example, other than UE categories 1 to 4) having high processing capacity.

For example, in the case of the time unit configuration 1 (DL Self-contained time unit) shown in FIG. 9A, the scheduling unit 102 is limited to the HARQ process number 1 in which a delay of 5 symbols is allowed for the terminal 200 having a low processing capacity. And assign. That is, the HARQ process number 2, which allows only a delay of 1 symbol, is not assigned to the terminal 200 having a low processing capacity. On the other hand, the scheduling unit 102 allocates either HARQ process number 1 which allows a delay of 5 symbols or HARQ process number 2 which allows a delay of only 1 symbol to the terminal 200 having a high processing capacity.

Similarly, for example, in the case of the time unit configuration 1 (UL Self-contained time unit) shown in FIG. 9B, the scheduling unit 302 has a HARQ process number in which a delay of 6 symbols is allowed for the terminal 400 having a low processing capacity. Assign only to 2. That is, the HARQ process number 1, which allows only a delay of 1 symbol, is not assigned to the terminal 400 having a low processing capacity. On the other hand, the scheduling unit 302 allocates either HARQ process number 1 which allows a delay of 1 symbol or HARQ process number 2 which allows a delay of 6 symbols to the terminal 400 having a high processing capacity.

Here, the time unit configuration 1 (FIGS. 9A and 9B) has been described, but the same applies to the time unit configuration 2 (FIG. 11).

As described above, in the present embodiment, among the plurality of HARQ processes in the time unit, the lower the capacity of the terminals 200 and 400, the longer the processing time is assigned to the terminals 200 and 400. By the above operation, the processing time of the terminals 200 and 400 having low processing capacity can be relaxed, so that the terminals 200 and 400 having low processing capacity can also perform the self-contained operation and realize low delay communication. Further, since the terminals 200 and 400 having low processing capacity can limit the HARQ process number (time resource) for receiving the signal from the base stations 100 and 300, the power consumption can be reduced.

In the present embodiment, the method of limiting the HARQ process number to be applied according to the processing capacity of the terminals 200 and 400 has been described, but the method of determining the HARQ process number is not limited to this. For example, the scheduling units 102 and 302 may limit the HARQ process number applied to the terminals 200 and 400 according to the amount of decoding processing required for DL data. Specifically, the scheduling units 102 and 302 may assign a HARQ process number that allows a longer delay to DL data that requires a large amount of decoding processing. For example, in the case of the time unit configuration 1 shown in FIG. 9A, the scheduling unit 102 is limited to HARQ process number 1 in which a delay of 5 symbols is allowed for DL data in which the number of spatial multiplex layers of MIMO is equal to or greater than a predetermined threshold. And assign. As a result, the processing time of the terminals 200 and 400 can be relaxed.

(Embodiment 3)
The present embodiment is characterized in that the time unit configuration 1 (FIGS. 9A and 9B) and the time unit configuration 3 (FIGS. 12A and 12B) described in the embodiment are switched and selected based on a predetermined rule. There is.

[Base station configuration (when DL self-contained is operating)]
The configuration of the base station 100 that performs the DL self-contained operation according to the present embodiment is the same as that of the first embodiment (FIG. 5), but the operation of the scheduling unit 102 is different.

Specifically, the scheduling unit 102 selects either the time unit configuration 1 or the time unit configuration 3 based on a predetermined rule. Predetermined rules include, for example, the size of the gap length required in the time unit (for example, whether or not the gap length is equal to or greater than a predetermined threshold value). Other operations of the scheduling unit 102 are the same as those in the first embodiment. The details of the time unit configuration selection method in the scheduling unit 102 will be described later.

[Terminal configuration (when DL self-contained is operating)]
The configuration of the terminal 200 that performs the DL self-contained operation according to the present embodiment is the same as that of the first embodiment (FIG. 6), but the operation of the signal extraction unit 204 is different.

Specifically, the signal extraction unit 204 selects either the time unit configuration 1 or the time unit configuration 3 output from the time unit configuration storage unit 203 based on the instruction from the base station 100. The instruction from the base station 100 may be notified quasi-statically (semi-statically) using the broadcast channel, or may be included in DL assignment or the like and notified dynamically (for each time unit). Then, the signal extraction unit 204 extracts DL assignment and DL data for each HARQ process number from the baseband signal received from the reception unit 202 based on the selected time unit configuration. Other operations of the signal extraction unit 204 are the same as those in the first embodiment.

[Base station configuration (when UL self-contained is operating)]
The configuration of the base station 300 that performs the UL self-contained operation according to the present embodiment is the same as that of the first embodiment (FIG. 7), but the operation of the scheduling unit 302 is different.

Specifically, the scheduling unit 302 selects either the time unit configuration 1 or the time unit configuration 3 based on a predetermined rule (for example, the required size of the gap length). Other operations of the scheduling unit 302 are the same as those in the first embodiment. The details of the time unit configuration selection method in the scheduling unit 302 will be described later.

[Terminal configuration (when UL self-contained is operating)]
The configuration of the terminal 400 that performs the UL self-contained operation according to the present embodiment is the same as that of the first embodiment (FIG. 8), but the operation of the signal extraction unit 402 is different.

Specifically, the signal extraction unit 402 selects either the time unit configuration 1 or the time unit configuration 3 output from the time unit configuration storage unit 401 based on the instruction from the base station 300. The instruction from the base station 300 may be notified quasi-statically using the broadcast channel, or may be dynamically (for each time unit) notified by including it in UL assignment or the like. Then, the signal extraction unit 402 extracts the UL assignment for each HARQ process number from the baseband signal received from the reception unit 202 based on the selected time unit configuration. Other operations of the signal extraction unit 402 are the same as those in the first embodiment.

[How to select the time unit configuration]
Next, a method of selecting the time unit configuration in the scheduling units 102 and 302 of the base stations 100 and 300 will be described.

Specifically, the scheduling units 102 and 302 estimate the gap length required for one gap section. Then, the scheduling units 102 and 302 select the time unit configuration 1 (FIGS. 9A and 9B) when the estimated gap length is equal to or greater than a predetermined threshold value, and when the estimated gap length is less than the predetermined threshold value, the scheduling units 102 and 302 select the time unit configuration 1. Select the time unit configuration 3 (FIGS. 12A, 12B).

As described in the first embodiment, the time unit configuration 1 has an advantage that the overhead of the gap is small as compared with the time unit configuration 3. On the other hand, the time unit configuration 3 has an advantage that the average delay time is shorter than that of the time unit configuration 1. Therefore, in the present embodiment, the average delay time can be reduced while suppressing the increase in the overhead of the gap by switching the time unit configuration according to the size of the gap length required in the gap section.

As an example, the case where the predetermined threshold value is 2 symbols will be described.

As shown in FIG. 14A, when the gap length required for one gap section is less than 2 symbols, the scheduling unit 102 aims to shorten the average delay time by selecting the time unit configuration 3. When the gap length is less than the threshold value, the number of gap sections is increased by using the time unit configuration 3, but the influence of the gap overhead is small.

On the other hand, as shown in FIG. 14B, when the gap length required for one gap section is 2 symbols or more, the scheduling unit 102 suppresses the increase in gap overhead by selecting the time unit configuration 1.

Although the DL self-contained time unit has been described in FIGS. 14A and 14B, the same applies to the UL self-contained time unit (for example, FIGS. 9B and 12B).

Here, the selection of the time unit configuration may be dynamically controlled (for each time unit by notification by DL assignment or UL assignment). In the case of dynamic control, the amount of notification for control increases, but the amount of propagation delay changes for each communication partner terminal, and the required gap length changes. Therefore, the base stations 100 and 300 are used for each communication partner terminal 200 and 400. The optimum time unit configuration can be selected.

Alternatively, the selection of the time unit configuration may be controlled quasi-statically (every few hours, every few days by notification by the broadcast channel). For example, the base stations 100 and 300 obtain the required gap length based on the maximum delay time or the average delay time of all the accommodating terminals, and switch the time unit configuration in units of time when the distribution of the accommodating terminals 200 and 400 changes. You may. In the case of quasi-static control, the amount of notification for control can be reduced, and the base stations 100 and 300 can select the time unit configuration according to the distribution of the terminals 200 and 400 to be accommodated. In addition, fluctuations in cell-to-cell interference can be suppressed by switching the time unit configuration quasi-statically.

In this way, in the present embodiment, the base stations 100 and 300 schedule the terminals 200 and 400 based on the time unit configuration 1 when the gap length per gap section is equal to or greater than a predetermined threshold value. When the gap length is less than a predetermined threshold value, the terminals 200 and 400 are scheduled based on the time unit configuration 3. By the above operation, the base stations 100 and 300 can reduce the average delay time while suppressing the increase in the overhead of the gap according to the size of the gap length required for one gap section.

The embodiments of the present disclosure have been described above.

[Other embodiments]
(1) In the above embodiment, as an example, the time unit configuration when the number of HARQ processes in the time unit is two has been described, but the present disclosure can be applied to the case where the number of HARQ processes is three or more. A similar effect can be obtained. As an example, FIGS. 15A and 15B show a time unit configuration example when the number of HARQ processes = 3 in the time unit configuration 1 (see FIGS. 9A and 9B) of the first embodiment.

(2) In the above embodiment, the time unit configuration assuming the TDD system has been described, but the present disclosure can be similarly applied to the FDD system, and the same effect can be obtained. 16A and 16B show an example of a time unit configuration when the time unit configuration 1 of the first embodiment is applied to an FDD system. FIG. 16A shows a frame configuration in the downlink communication band (FDD DL band) of the FDD system, and FIG. 16B shows a frame configuration in the uplink communication band (FDD UL band) of the FDD system.

The FDD system eliminates the need for a gap that takes into account propagation delay. That is, the time unit configuration of the FDD system of FIGS. 16A and 16B eliminates the gap from the time unit configuration of the TDD system of FIGS. 9A and 9B, and in each of the DL self-contained time unit and the UL self-contained time unit, The uplink transmission area and the downlink transmission area are separated in time and arranged in the downlink communication band and the uplink communication band of the FDD system, respectively. Even when applied to an FDD system, the same effect as that of the above embodiment can be obtained.

(3) In the above embodiment, one time unit is described as a time unit (= 1 ms) including 14 symbols (OFDM symbol) at a subcarrier interval of 15 kHz, but the one time unit is not limited to this time unit. For example, one time unit may be defined as a time unit containing 14 symbols regardless of the subcarrier interval.

For example, FIG. 17A shows an example of a time unit configuration in the case where one time unit is defined as a time unit (= 1 ms) including a subcarrier interval of 15 kHz and 14 symbols (OFDM symbol). Further, FIG. 17B shows an example of a time unit configuration when one time unit is defined as a time unit (= 0.25 ms) including a subcarrier interval of 60 kHz and 14 symbols (OFDM symbol).

In FIG. 17B (subcarrier interval: 60 kHz), the time length of one time unit is shortened to 1/4 as compared with FIG. 17A (subcarrier interval: 15 kHz), so that the average delay time of DL data or UL data is set. Can be shortened.

Further, in the time unit configuration shown in FIG. 17B, the switching cycle between the DL self-contained time unit and the UL self-contained time unit can be shortened, so that wireless resources can be efficiently allocated even when the amount of upstream and downstream traffic is biased. Can be done.

(4) Further, in the above-described embodiment, the case where one aspect of the present disclosure is configured by hardware has been described as an example, but the present disclosure can also be realized by software in cooperation with hardware.

Further, each functional block used in the description of the above embodiment is typically realized as an LSI which is an integrated circuit. The integrated circuit may control each functional block used in the description of the above embodiment and include an input and an output. These may be individually integrated into one chip, or may be integrated into one chip so as to include a part or all of them. Although it is referred to as an LSI here, it may be referred to as an IC, a system LSI, a super LSI, or an ultra LSI depending on the degree of integration.

Further, the method of making an integrated circuit is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. An FPGA (Field Programmable Gate Array) that can be programmed after the LSI is manufactured, or a reconfigurable processor that can reconfigure the connection and settings of circuit cells inside the LSI may be used.

Furthermore, if an integrated circuit technology that replaces an LSI appears due to advances in semiconductor technology or another technology derived from it, it is naturally possible to integrate functional blocks using that technology. There is a possibility of applying biotechnology.

The base station of the present disclosure is a time unit composed of a downlink transmission region, an uplink transmission region, and a gap section which is a switching point from the downlink transmission region to the uplink transmission region, and is downlink in the downlink transmission region. A transmission unit for transmitting a signal and a reception unit for receiving an uplink signal in the uplink transmission region in the time unit are provided, and each time unit includes the downlink transmission region and the uplink transmission for a plurality of HARQ processes. Each region is included.

In the base station of the present disclosure, the arrangement position of the downlink transmission area and the arrangement position of the uplink transmission area are fixed with respect to each of the plurality of HARQ processes in the time unit.

In the base station of the present disclosure, the uplink transmission area is arranged at the end of the time unit.

In the base station of the present disclosure, the uplink transmission area corresponding to at least one HARQ process among the plurality of HARQ processes is faster than the downlink transmission area corresponding to the at least one HARQ process in the time unit. Placed at the timing.

In the base station of the present disclosure, each time unit includes only one gap section.

In the base station of the present disclosure, the HARQ process used by the terminal is determined from the plurality of HARQ processes according to the processing capacity of the terminal.

In the base station of the present disclosure, each time unit includes the same number of gap sections as the number of the plurality of HARQ processes, and in each time unit, the downlink transmission area and the uplink transmission area for each of the plurality of HARQ processes. The gap sections are arranged between the two.

In the base station of the present disclosure, the switching timing between the uplink transmission area and the downlink transmission area in the time unit for downlink data communication, and the uplink transmission area in the time unit for uplink data communication. And the switching timing of the downlink transmission area coincide with each other.

In the base station of the present disclosure, the plurality of HARQ processes include a first configuration in which each time unit includes only one gap section, and each time unit includes the number of the plurality of HARQ processes in which the gap section is present. When the second configuration including the same number and the second configuration are included and the gap length per one gap section is equal to or larger than a predetermined threshold value, the terminal is scheduled based on the first configuration, and the gap length is the predetermined gap length. Further includes a scheduling unit that schedules terminals based on the second configuration when the value is less than the threshold value of.

The terminal of the present disclosure is a time unit composed of a downlink transmission region, an uplink transmission region, and a gap section which is a switching point from the downlink transmission region to the uplink transmission region, and a downlink signal in the downlink transmission region. The time unit includes a receiving unit for receiving the above and a transmitting unit for transmitting an uplink signal in the uplink transmission region in the time unit, and each time unit includes the downlink transmission region and the uplink transmission region for a plurality of HARQ processes. Are included respectively.

The communication method of the present disclosure is a time unit composed of a downlink transmission area, an uplink transmission area, and a gap section which is a switching point from the downlink transmission area to the uplink transmission area, and is downlink in the downlink transmission area. A signal is transmitted, and in the time unit, an uplink signal is received in the uplink transmission region, and each time unit includes the downlink transmission region and the uplink transmission region for a plurality of HARQ processes, respectively.

The communication method of the present disclosure is a time unit composed of a downlink transmission area, an uplink transmission area, and a gap section which is a switching point from the downlink transmission area to the uplink transmission area, and is downlink in the downlink transmission area. Upon receiving the signal, the time unit transmits an uplink signal in the uplink transmission region, and each time unit includes the downlink transmission region and the uplink transmission region for a plurality of HARQ processes, respectively.

One aspect of the present disclosure is useful for mobile communication systems.

100,300 Base station 101, 203, 301, 401 Time unit configuration storage unit 102, 302 Scheduling unit 103, 303 Control signal generation unit 104, 304 Control signal modulation unit 105, 404 Data coding unit 106, 405 Retransmission control unit 107 , 406 Data modulation unit 108, 211, 305, 407 Signal allocation unit 109, 212 Transmission unit 110, 201 Antenna 111, 202 Reception unit 112, 204, 306, 402 Signal extraction unit 113 Demodition / decoding unit 114 Judgment unit 200 Terminal 205 , 403 Control signal demodulation / decoding unit 206,307 Data demodulation unit 207 Data decoding unit 208,309 Error detection unit 209 Response signal generation unit 210 Coding / modulation unit 308 Retransmission synthesis decoding unit

Claims (17)

A control circuit and a control circuit in which the first uplink signal is arranged as a part of a time unit composed of 14 symbols, and the first uplink signal corresponds to the first downlink signal,
A transmitter for transmitting the first uplink signal, and a transmitter for transmitting the first uplink signal.
A part of the time unit is between a second downlink signal transmitted to a different terminal device and a second uplink signal transmitted from the different terminal device, and the second downlink signal and the second uplink signal. The uplink signal is placed in the time unit,
Terminal equipment. The first downlink signal is a downlink data signal transmitted to the terminal device, and the first uplink signal is a response signal corresponding to the first downlink signal.
The terminal device of claim 1. The second downlink signal is a downlink data signal transmitted to the different terminal device, and the second uplink signal is a response signal corresponding to the second downlink signal.
The terminal device of claim 2. The first downlink signal is a downlink control signal transmitted to the terminal device, and the first uplink signal is an uplink data signal indicated by the first downlink signal.
The terminal device of claim 1. The second downlink signal is a downlink control signal transmitted to the different terminal device, and the second uplink signal is an uplink data signal indicated by the second downlink signal.
The terminal device of claim 1. The time unit includes a first region for downlink transmission, a second region for uplink transmission, and a third region set between the first region and the second region.
The terminal device of claim 1. The time unit includes a first region for downlink transmission, a second region for uplink transmission, and a third region set between the first region and the second region.
The time interval between the second downlink signal and the second uplink signal is the total number of symbols of the number of symbols in the third region and the number of symbols in the first uplink signal.
The terminal device of claim 2. The time unit includes a first region for downlink transmission, a second region for uplink transmission, and a third region set between the first region and the second region.
The time interval between the second downlink signal and the second uplink signal is the total number of symbols of the number of symbols in the third region and the number of symbols in the first downlink signal.
The terminal device of claim 4. The terminal device is
The first uplink signal is arranged as a part of a time unit composed of 14 symbols, and the first uplink signal corresponds to the first downlink signal.
The first uplink signal is transmitted,
A part of the time unit is between a second downlink signal transmitted to a different terminal device and a second uplink signal transmitted from the different terminal device, and the second downlink signal and the second uplink signal. The uplink signal is placed in the time unit,
Communication method. The first downlink signal is a downlink data signal transmitted to the terminal device, and the first uplink signal is a response signal corresponding to the first downlink signal.
The communication method of claim 9. The second downlink signal is a downlink data signal transmitted to the different terminal device, and the second uplink signal is a response signal corresponding to the second downlink signal.
The communication method of claim 10. The first downlink signal is a downlink control signal transmitted to the terminal device, and the first uplink signal is an uplink data signal indicated by the first downlink signal.
The communication method of claim 9. The second downlink signal is a downlink control signal transmitted to the different terminal device, and the second uplink signal is an uplink data signal indicated by the second downlink signal.
The communication method of claim 12. The time unit includes a first region for downlink transmission, a second region for uplink transmission, and a third region set between the first region and the second region.
The communication method of claim 9. The time unit includes a first region for downlink transmission, a second region for uplink transmission, and a third region set between the first region and the second region.
The time interval between the second downlink signal and the second uplink signal is the total number of symbols of the number of symbols in the third region and the number of symbols in the first uplink signal.
The communication method of claim 10. The time unit includes a first region for downlink transmission, a second region for uplink transmission, and a third region set between the first region and the second region.
The time interval between the second downlink signal and the second uplink signal is the total number of symbols of the number of symbols in the third region and the number of symbols in the first downlink signal.
The communication method of claim 12. The processing and processing, in which the first uplink signal is arranged in a part of the time unit composed of 14 symbols, and the first uplink signal corresponds to the first downlink signal,
Controlling the process of transmitting the first uplink signal,
A part of the time unit is between a second downlink signal transmitted to a different terminal device and a second uplink signal transmitted from the different terminal device, and the second downlink signal and the second uplink signal. The uplink signal is placed in the time unit,
Integrated circuit.

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