JP6730499B2 - Base station, communication method, and integrated circuit - Google Patents

Description

The present invention relates to the field of wireless communication, and more particularly to a user equipment (UE) and a wireless communication method for licensed assisted access (LAA).

The proliferation of mobile data has forced operators to utilize finite frequency spectra with increasing efficiency. On the other hand, many unlicensed frequency spectra are used with low efficiency only by Wi-Fi, Bluetooth (registered trademark) or the like. LTE-U (LTE-Unlicensed) and Licensed-Assisted Access (LAA) have allowed the LTE spectrum to be extended to unlicensed bands that can directly and dramatically increase LTE network capacity.

3GPP TS36.213(3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access(E-UTRA); Physical layer procedures)

In one non-limiting embodiment of the present invention, an approach is provided that increases the likelihood that a PUSCH can be sent after Listen Before Talk (LBT) in a scheduled subframe.

A base station according to an embodiment of the present disclosure includes a transmitter that transmits an uplink grant indicating a time resource configured with a plurality of symbols for uplink transmission, and a plurality of position candidates in the time resource. And a receiver for receiving a Physical Uplink Shared CHannel (PUSCH) transmitted from one position, wherein the plurality of symbols are 14 symbols, and the plurality of position candidates are the first symbol in the time resource. It is the head of the eighth symbol, and the receiver receives the PUSCH data generated by the same transport block size in any of the plurality of position candidates.

A communication method according to an embodiment of the present disclosure includes a step of transmitting an uplink grant indicating a time resource configured by a plurality of symbols for uplink transmission, and a plurality of position candidates in the time resource. Receiving a Physical Uplink Shared CHannel (PUSCH) transmitted from one position, the plurality of symbols is 14 symbols, and the plurality of position candidates are the first symbol and the eighth symbol in the time resource. , Which is the beginning of the symbol, and receives the PUSCH data generated by the same transport block size in any of the plurality of position candidates.

An integrated circuit according to an embodiment of the present disclosure includes a process of transmitting an uplink grant indicating a time resource composed of a plurality of symbols for uplink transmission, and a plurality of position candidates in the time resource. And a process of receiving a Physical Uplink Shared CHannel (PUSCH) transmitted from one position, wherein the plurality of symbols are 14 symbols, and the plurality of position candidates are the first symbol in the time resource and 8 It is the beginning of the th symbol, and in any of the plurality of position candidates, the PUSCH data generated by the same transport block size is received.

It should be noted that general or specific embodiments may be implemented as a system, a method, an integrated circuit, a computer program, a storage medium, or any optional combination thereof.

Further benefits and advantages of the disclosed embodiments will be apparent from the specification and drawings. These benefits and/or advantages may be obtained individually with the various embodiments and features of the specification and drawings, with the purpose of obtaining one or more of these benefits and/or advantages. And it is not necessary to provide all the features.

The above and other features of the present invention will become more apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. It should be understood that these drawings depict only a few embodiments of the present invention and, therefore, these drawings are not considered to limit the scope of the present disclosure. The present invention will be described more specifically and in detail by using the accompanying drawings.

FIG. 6 is a schematic diagram illustrating a situation in which a partial subframe is adopted. 3 is a flowchart of a wireless communication method according to an embodiment of the present invention. It is a schematic block diagram of UE which concerns on embodiment of this invention. FIG. 6 is a schematic diagram of an embodiment of the present invention with two possible start positions for PUSCH in a subframe. FIG. 6 is a schematic diagram of RE mapping according to an embodiment of the present invention. FIG. 7 is a diagram schematically illustrating formation of a PUSCH having a one-slot length by using intra-subframe frequency hopping according to an embodiment of the present invention. FIG. 5 is a diagram schematically illustrating formation of a PUSCH having a one-slot length by using mapping for a two-slot PUSCH according to an embodiment of the present invention. FIG. 3 is a schematic diagram of an exemplary UL subframe structure according to an embodiment of the present invention. FIG. 6 is a schematic diagram of a burst with a partial subframe at the end of the burst to occupy the entire burst.

In the following detailed description, reference is made to the accompanying drawings, which form a part of the description. In the drawings, similar symbols typically identify similar elements, unless context dictates otherwise. It should be noted that each aspect of the invention can be arranged, permuted, combined and designed in a variety of different configurations, and all such aspects are expressly intended and form part of this disclosure. Will be easily understood.

Unlike autonomous distributed control systems such as WiFi, LTE is an eNB-centric system in which both downlink data transmissions and uplink data transmissions are scheduled by the eNB. The UL grant for the Physical Uplink Shared Channel (PUSCH) should be transmitted before the allowed subframe (eg 4 ms before the allowed subframe). On the other hand, some regional requirements, such as Europe, require Listen Before Talk (LBT) on the sender side (which can be either an eNB or a UE). UL grant was sent because the LBT result in the allowed subframes is not known at the time of UL grant transmission, but scheduling overhead and delay increase when UE cannot acquire channel due to LBT failure. To do.

In order to increase the possibility that the PUSCH can be transmitted after the LBT in the scheduled subframe, the PUSCH that can be flexibly started at the position in the scheduled subframe of the LBT is introduced. Hereinafter, a subframe shorter than a normal subframe is referred to as a partial subframe, and a PUSCH carried in the partial subframe is referred to as a partial PUSCH. FIG. 1 is a schematic diagram showing a situation in which a partial subframe is adopted. As shown in FIG. 1, the UL grant is sent from the eNB to the UE before the scheduled subframe. The UE is doing an LBT just before the scheduled subframe, but the LBT has failed (ie the channel is busy). In this case, the UE cannot transmit the PUSCH from the head boundary of the scheduled subframe. In this case, the UE may perform LBT again in the scheduled subframe. For example, as shown in FIG. 1, if the LBT in the scheduled subframe is successful, then according to the present invention, from a position in the scheduled subframe (eg, in the scheduled subframe The PUSCH can be sent (from the beginning of the second slot). The PUSCH can end at the boundary of the end of the scheduled subframe. The PUSCH that starts at a position in the scheduled subframe and ends at the end boundary of the scheduled subframe is shorter than one subframe, which can be called a partial PUSCH.

According to an embodiment of the present invention, a wireless communication method for LAA is provided. FIG. 2 is a flowchart of the wireless communication method 200. The wireless communication method 200 can be performed by the UE, and the wireless communication method 200 can include steps 201 to 203. In step 201, the UE receives a UL grant scheduling a subframe for UL transmission. The UL grant can be transmitted by the eNB. In step 202, the UE performs Listen Before Talk (LBT). In step 203, the UE transmits PUSCH in the scheduled subframe starting from one available start position of the plurality of start position candidates in the scheduled subframe when the LBT is successful. In particular, the PUSCH in this case is the first transmitted PUSCH during the burst, and this first transmitted PUSCH can end at the boundary of the end of the scheduled subframe. According to this embodiment, the UE selects the PUSCH start position from the available candidate positions after successful LBT. For example, the UE may send PUSCH immediately after successful LBT. If necessary, other signals (eg, preamble, reservation signal, etc.) can be transmitted before PUSCH. If there are no candidate positions available after the LBT or the LBT is unsuccessful in the scheduled subframe, the UE does not send PUSCH in the scheduled subframe.

In addition, the embodiment of the present invention provides a UE for LAA for performing the communication method. FIG. 3 is a schematic block diagram of the UE 300 according to the embodiment of the present invention. The UE 300 includes a receiving unit 301 that operates to receive a UL grant that schedules a subframe for UL transmission, a first circuit 302 that operates to perform an LBT, and a scheduling if the LBT is successful. And a transmitter 303 that operates to transmit a first PUSCH starting from one available start position of a plurality of candidate start positions in the subframe in a scheduled subframe.

In the UE 300 according to the present invention, a central processing unit (CPU) 310 for executing various programs to process various data and controlling the operation of each unit in the UE 300, and a CPU 310 having various processes and A read only memory (ROM) 313 for storing various programs necessary for control, and a random number for temporarily storing intermediate data generated during the progress of processes and control by the CPU 310. A random access memory (RAM) 315 and/or a storage device 317 for storing various programs and data and the like may be optionally included. The receiving unit 301, the first circuit 302, the transmitting unit 303, the CPU 310, the ROM 313, the RAM 315, and/or the storage device 317 and the like may be connected to each other via a data bus and/or a command bus 320, and may be signaled to each other. Can be transferred.

The components described above do not limit the scope of the invention. According to an embodiment of the present invention, the functions of the reception unit 301, the first circuit 302, and the transmission unit 303 may be realized by hardware, and the ROM 313, the RAM 315, and/or the storage device 317 are unnecessary. May be Alternatively, the functions of the reception unit 301, the first circuit 302, and the transmission unit 303 may be realized by functional software in combination with the CPU 310, the ROM 313, the RAM 315, and/or the storage device 317.

As mentioned above, in one scheduled subframe according to the UL grant sent by the eNB, the PUSCH may start at multiple predefined positions. After the LBT succeeds in the scheduled subframe at the UE, the UE starts transmitting the PUSCH at one of the available predefined positions. Therefore, the possibility that the PUSCH can be transmitted after the LBT in the scheduled subframe increases.

In one embodiment, there can be two candidate start positions in a scheduled subframe, and these candidate start positions are respectively at the start of two slots in the scheduled subframe. Therefore, there are two PUSCH candidates corresponding to the two starting position candidates, the first PUSCH candidate (partial PUSCH) of the two PUSCH candidates is one slot length, and the second PUSCH candidate of the two PUSCH candidates (normal PUSCH) is 2 slots long.

FIG. 4 is a schematic diagram of an embodiment in which there are two candidate start positions for PUSCH in a subframe. As shown in FIG. 4, one UL grant from the eNB may have one of two lengths (that is, one slot length or two slot length), and one PUSCH may be scheduled in a scheduled subframe. This PUSCH can always end at the boundary of the end of the scheduled subframe. After successful LBT, the UE selects the PUSCH start position from the available candidate positions. If necessary, other signals (eg, preamble, reservation signal, etc.) can be transmitted before PUSCH. If there are no candidate positions available after the LBT or the LBT is unsuccessful in the scheduled subframe, the UE does not send PUSCH in the scheduled subframe.

Since the PUSCH length is not predictable when the UL grant is sent, it may be necessary to prepare multiple PUSCHs (one slot length or two slot lengths) that can be of two different lengths. According to the current UL grant (LTE Release 13), the RB allocation, MCS, and the number of transport blocks are notified to the UE. The number of REs for PUSCH transmission can be individually obtained according to the expected PUSCH length.

There are two possible approaches to the transport block size. The first option is to prepare two transport blocks according to the length of each PUSCH (N RBs are assigned to a normal PUSCH, and a partial PUSCH is
RBs shall be allocated (“N” is the number of allocated RBs notified in the UL grant)). In other words, in one embodiment, the UE may comprise a second circuit operative to prepare two transport blocks for each of the two PUSCH candidates, where the second PUSCH candidate is It is assumed that N RBs are allocated to the (normal PUSCH), and that the first PUSCH candidate (partial PUSCH) is
RBs shall be allocated (“N” is the number of allocated RBs notified in the UL grant). Alternatively, the second option is to reinterpret the MCS in the UL grant (eg, increase modulation order and/or code rate) for the partial PUSCH and prepare one transport block. In other words, in one embodiment, the UE may comprise a second circuit that operates to prepare one transport block for two PUSCH candidates, in which case it was notified in the UL grant. The Modulation and Coding Scheme (MCS) is reinterpreted for the first PUSCH candidate.

Regarding the RE mapping, the current RE mapping is performed for each slot and every time when the TBS is determined (as shown in FIG. 5, the first PUSCH data mapping in time, the PUSCH RS, the CQI/PMI, the ACK/NACK, the RI. Can be reused for a partial PUSCH having a length of 1 slot.

The current intra-subframe frequency hopping for PUSCH provides two slots in different frequency bands. FIG. 6 is a diagram schematically illustrating formation of a PUSCH having a one-slot length by using intra-subframe frequency hopping according to an embodiment of the present invention. As shown on the left side of FIG. 6, the first slot of all allocated RBs (slot 0) is mapped in one subband, and the second slot of all allocated RBs (slot 1) is the sub-band. It is mapped to another subband (a subband within the same bandwidth as the above subband) separated from the band by several RBs. Then, as shown on the right side of FIG. 6, a PUSCH having a one-slot length is obtained by combining the RBs assigned to slot 0 and the RBs assigned to slot 1 into one slot (slot 1). You can That is, in the time domain, the assigned RBs are put in one slot, and in the frequency domain, these RBs can be consecutively arranged in the original order. In other words, in one embodiment, the UE combines the RBs assigned to slot 0 and the RBs assigned to slot 1 of a PUSCH of 2 slot length in one slot using intra-subframe frequency hopping. May comprise a third circuit operative to form a first PUSCH candidate.

Alternatively, there are N RBs in one slot, and one sPUSCH (shortened PUSCH) has two RBs in two slots.
It is possible to use mappings for each PUSCH (“N” is the number of allocated RBs notified in the UL grant). FIG. 7 is a diagram schematically illustrating formation of a PUSCH having a 1-slot length by using mapping for a 2-slot PUSCH according to an embodiment of the present invention. As shown in FIG. 7 where N is assumed to be an even number, in the first step, RE mapping of 2-slot PUSCH with N/2 RBs in each slot is performed, and in the second step Each RB in two slots is mapped to two adjacent RBs in one slot. If N is even, all of the allocated RBs can be used by the PUSCH of one slot length. If N is an odd number, one of the allocated RBs may not be used by the PUSCH of one slot length. According to this embodiment, the UE has RBs in two slots.
A third circuit may be provided that operates to form a first PUSCH candidate with N RBs in one slot by using mappings for each two PUSCHs of two slot length, where: Each RB in two slots is mapped to two adjacent RBs in one slot.

As described above, the RE mapping, TBS determination, and intra-subframe hopping can be reused, so that by using the starting position candidate (ie, two starting position candidates) at the slot level to the UE transceiver. Modification/complexity of the UE transceiver and the impact of the specifications can be minimized. Note that the second circuit and the third circuit can be realized by hardware or functional software similar to the first circuit 302.

In other embodiments, the candidate starting positions may be at the symbol level. One UL grant from the eNB has a maximum length of 14 types (that is, 1 to 14 single-carrier frequency division multiple access (SC-FDMA) symbols). The PUSCH may be scheduled within a scheduled subframe (eg, in the case of a regular cyclic prefix, at four starting positions of symbols 0, 4, 7, or 11). A Sounding Reference Signal (SRS) symbol (the last SC-FDMA symbol in the uplink subframe) may be excluded in the SRS subframe. After successful LBT, the UE selects one available PUSCH start position. For this embodiment, the PUSCH should be prepared with multiple possible lengths, and a new TBS decision (eg, scale factor) based on the PUSCH length excluding 13-symbol length and 14-symbol length may be used. is necessary. The current transport block size table defined in Non-Patent Document 1 assumes a normal PUSCH of 14 symbols or 12 symbols depending on the length of a cyclic prefix (CP: Cyclic Prefix). Therefore, a PUSCH having a smaller number of SC-FDMA symbols may have a scale factor applied to the current TBS according to the number of REs of PUSCH data. For example, the scale factor can be obtained by the number of SC-FDMA symbols of PUSCH divided by 14. Also, a new RE mapping starting from the first SC-FDMA symbol of PUSCH is required except for 14 symbol length. The UL subframe structure in the licensed carrier as shown in FIG. 8 where the RS of PUSCH is always in a predefined symbol position (ie, symbol 3 or 10 in the case of normal CP, extended CP (extended CP)). , Then reuse the current UL subframe structure aligned to symbol 2 or 8) is one approach. In this approach, the PUSCH SC-FDMA symbols in the current UL subframe structure are truncated from the beginning. A long block (LB) is equal to an SC-FDMA symbol. Shifting the UL subframe structure, i.e. shifting all SC-FDMA symbols from left to right in Figure 8, is another approach. In this approach, the UL subframe structure is truncated from the end. For a 13SC-FDMA long PUSCH starting from the second SC-FDMA symbol, shift right one SC-FDMA symbol from the current subframe with SRS (in the last SC-FDMA symbol of the current uplink subframe). DMRS are required.

In another embodiment, the transmitter of the UE is further operable to transmit the second PUSCH ending at the end of the burst. In the present invention, "first" and "second" of "first PUSCH" and "second PUSCH" do not limit the order of PUSCH and simply distinguish one PUSCH from the other. Is. Based on regional regulations, the maximum burst length may be limited (eg, 4 ms in Japan and 10 ms in Europe). If there is a partial subframe at the beginning of one UL burst (consisting of the uplink transmissions of at least one UE), the partial subframe at the end is useful for reaching the maximum allowed occupation time (typically 1 ms granularity). sell. There may be multiple approaches to scheduling partial subframes at the end of a burst. For example, one approach is to independently schedule partial subframes at the end of a burst with separate UL grants like other subframes, and another approach is as shown in FIG. One implicitly schedules a partial subframe at the end of a burst with a UL grant for the partial subframe at the beginning of the burst for the same UE. FIG. 9 is a schematic diagram of a burst with a partial subframe at the end of the burst to occupy the entire burst. As shown in FIG. 9, the partial subframe at the end of the burst is not explicitly scheduled by the individual UL grant, but implicitly by the UL grant for the partial subframe at the beginning of the burst. There is. In other words, if the first scheduled subframe of the burst is a partial subframe, the partial subframe at the end of the burst is implicitly scheduled.

In another embodiment, the uplink partial subframe is scheduled and/or coded with a normal subframe adjacent to the uplink partial subframe when the UE is scheduled in two or more subframes consecutively. can do. When the uplink partial subframe is at the beginning of the burst, the normal subframe adjacent to the uplink partial subframe is the next subframe. When the uplink partial subframe is at the end of the burst, the normal subframe adjacent to the uplink partial subframe is the preceding normal subframe. For example, if the above-mentioned first PUSCH does not start from the beginning boundary of the scheduled subframe, the scheduled subframe can be coded together with the next subframe of the scheduled subframe. If the above-mentioned second PUSCH does not end at the boundary of the end of the last subframe of the burst, the last subframe can be coded together with the subframe before the last subframe.

The present invention can be implemented by software, hardware, or software that cooperates with hardware. Each functional block used in the description of each of the above embodiments can be realized by an LSI that is an integrated circuit, and each process described in each embodiment can be controlled by an LSI. These LSIs may be individually formed as chips, or one chip may be formed so as to include some or all of the functional blocks. The LSI may have a data input section and a data output section coupled to the LSI. In the present specification, the LSI can be referred to as an IC, a system LSI, a super LSI, or an ultra LSI depending on the degree of integration. The method of circuit integration is not limited to LSI, and can be realized by a dedicated circuit or a general-purpose processor. Further, a field programmable gate array (FPGA) that can be programmed after the LSI is manufactured, or a reconfigurable processor capable of reconfiguring the connection and setting of circuit cells inside the LSI may be used.

It is to be noted that the present invention is intended to be variously changed or modified by those skilled in the art based on the description presented in the specification and the known technology without departing from the spirit and scope of the present invention. Modifications and applications fall within the scope of the protected claims. Furthermore, the constituent elements of the above-described embodiments can be arbitrarily combined without departing from the spirit of the present invention.

Embodiments of the present invention can provide at least the following subject matter.
1. A receiver that operates to receive a UL grant that schedules subframes for uplink (UL) transmission;
A first circuit that operates to perform listen-before-talk (LBT);
When the LBT is successful, a first Physical Uplink Shared CHannel (PUSCH) starting from one available start position of a plurality of start position candidates in the scheduled subframe is And a transmitter operative to transmit in the scheduled subframe,
User equipment for licensed-assisted access (LAA).

2. The first PUSCH ends at the boundary of the end of the scheduled subframe,
1. The user equipment according to 1.

3. Within the scheduled subframe, there are two start position candidates at the respective start points of the two slots of the scheduled subframe, and there are two PUSCH candidates corresponding to the two start position candidates. The first PUSCH candidate of the two PUSCH candidates is one slot long, and the second PUSCH candidate of the two PUSCH candidates is two slot long,
2. The user equipment according to 2.

4. Further comprising a second circuit operative to prepare two transport blocks for each of the two PUSCH candidates,
It is assumed that N resource blocks (RBs) are allocated to the second PUSCH candidate, and the first PUSCH candidate is assigned to the first PUSCH candidate.
RBs are allocated, and N is the number of allocated RBs notified in the UL grant.
User equipment according to item 3.

5. Further comprising a second circuit operative to prepare one transport block for the two PUSCH candidates,
The Modulation and Coding Scheme (MCS) notified in the UL grant is reinterpreted for the first PUSCH candidate,
User equipment according to item 3.

6. Forming the first PUSCH candidate by combining the RBs assigned to slot 0 and the RBs assigned to slot 1 of the PUSCH having a length of 2 slots in one slot using intra-frame frequency hopping. Further comprising a third circuit that operates,
User equipment according to item 3.

7. RB in two slots
Further comprising a third circuit operative to form said first PUSCH candidates with N RBs in one slot by using mappings for each two PUSCHs of two slot length. Each RB is mapped to two adjacent RBs in one slot,
User equipment according to item 3.

8. The start position candidate is a symbol level position,
1. The user equipment according to 1.

9. If the first PUSCH does not start at the beginning boundary of the scheduled subframe, the scheduled subframe is coded with the next subframe of the scheduled subframe,
1. The user equipment according to 1.

10. The transmitter further operates to transmit a second PUSCH ending at the end of a burst,
1. The user equipment according to 1.

11. If the second PUSCH does not end at the boundary of the end of the last subframe of the burst, the last subframe is coded together with the subframe before the last subframe,
10. The user equipment according to 10.

12. Receiving UL grants for scheduling subframes for uplink (UL) transmission,
The steps of performing Listen-Before-Talk (LBT),
When the LBT is successful, a first Physical Uplink Shared CHannel (PUSCH) starting from one available start position of a plurality of start position candidates in the scheduled subframe is Transmitting in a scheduled subframe, a wireless communication method for Licensed-Assisted Access (LAA) performed by a user equipment.

13. The first PUSCH ends at the boundary of the end of the scheduled subframe,
12. The wireless communication method according to item 12.

14. In the scheduled subframe, there are two start position candidates at respective start points of the two slots of the scheduled subframe, and there are two PUSCH candidates corresponding to the two start position candidates. The first PUSCH candidate of the two PUSCH candidates is one slot long, and the second PUSCH candidate of the two PUSCH candidates is two slot long,
13. The wireless communication method according to 13.

15. Further comprising preparing two transport blocks for each of the two PUSCH candidates,
It is assumed that N resource blocks (RBs) are allocated to the second PUSCH candidate, and the first PUSCH candidate is assigned to the first PUSCH candidate.
RBs are allocated, and N is the number of allocated RBs notified in the UL grant.
14. The wireless communication method according to 14.

16. Further comprising preparing one transport block for the two PUSCH candidates,
The Modulation and Coding Scheme (MCS) notified in the UL grant is reinterpreted for the first PUSCH candidate,
14. The wireless communication method according to 14.

17. Forming the first PUSCH candidate by combining the RBs assigned to slot 0 and the RBs assigned to slot 1 of a 2-slot long PUSCH in one slot using intra-subframe frequency hopping. 15. The wireless communication method according to 14, further including.

18. RB in two slots
Forming the first PUSCH candidate with N RBs in one slot by using mappings for each two PUSCHs of two slot length, each RB of two slots being one slot Is mapped to two adjacent RBs of
14. The wireless communication method according to 14.

19. The start position candidate is a symbol level position,
12. The wireless communication method according to item 12.

20. If the first PUSCH does not start at the beginning boundary of the scheduled subframe, the scheduled subframe is coded with the next subframe of the scheduled subframe,
12. The wireless communication method according to item 12.

21. Further comprising transmitting a second PUSCH ending at the end of the burst,
12. The wireless communication method according to item 12.
22. If the second PUSCH does not end at the boundary of the end of the last subframe of the burst, the last subframe is coded together with the subframe before the last subframe,
21. The wireless communication method according to 21.

In addition, the embodiments of the present disclosure can provide an integrated circuit including a module for performing the steps in the respective communication methods described above. Further, an embodiment of the present disclosure is a computer-readable storage medium in which a computer program including a program code is stored, the program code being executed by a computing device, wherein the program code corresponds to each of the above communication methods. A computer-readable storage medium may be provided that performs the steps.

Claims (24)

A transmitter for transmitting an uplink grant indicating a time resource composed of a plurality of symbols for uplink transmission,
A receiver for receiving a Physical Uplink Shared CHannel (PUSCH) transmitted from one position among a plurality of position candidates in the time resource,
The plurality of symbols are 14 symbols, the plurality of position candidates are the heads of the first symbol and the eighth symbol in the time resource,
The receiver receives the PUSCH data generated by the same transport block size in any of the plurality of position candidates,
base station. The PUSCH ends at least at a boundary in the time resource,
The base station according to claim 1. The time resource is notified before a Listen-Before-Talk (LBT) result is obtained in the user equipment,
The base station according to claim 1. Channel access by Listen-Before-Talk (LBT) in user equipment fails if the channel is busy,
The base station according to claim 1. If channel access by Listen-Before-Talk (LBT) in the user equipment fails, LBT is performed again in the time resource.
The base station according to claim 1. The one position is determined from the position candidates based on a result of channel access by Listen-Before-Talk (LBT) in the user equipment.
The base station according to claim 1. The time resource is a subframe,
The base station according to claim 1. Receiving the PUSCH using licensed-assisted access (LAA),
The base station according to claim 1. Transmitting an uplink grant indicating a time resource composed of multiple symbols for uplink transmission,
Receiving a Physical Uplink Shared CHannel (PUSCH) transmitted from one position of a plurality of position candidates in the time resource,
The plurality of symbols are 14 symbols, the plurality of position candidates are the heads of the first symbol and the eighth symbol in the time resource,
In any case of the plurality of position candidates, the PUSCH data generated by the same transport block size is received.
Communication method. The PUSCH ends at least at a boundary in the time resource,
The communication method according to claim 9. The time resource is notified before a Listen-Before-Talk (LBT) result is obtained in the user equipment,
The communication method according to claim 9. Channel access by Listen-Before-Talk (LBT) in user equipment fails if the channel is busy,
The communication method according to claim 9. If channel access by Listen-Before-Talk (LBT) in the user equipment fails, LBT is performed again in the time resource.
The communication method according to claim 9. The one position is determined from the position candidates based on a result of channel access by Listen-Before-Talk (LBT) in the user equipment.
The communication method according to claim 9. The time resource is a subframe,
The communication method according to claim 9. Receiving the PUSCH using licensed-assisted access (LAA),
The communication method according to claim 9. A process of transmitting an uplink grant indicating a time resource composed of a plurality of symbols for uplink transmission,
And a process of receiving a Physical Uplink Shared CHannel (PUSCH) transmitted from one position among a plurality of position candidates in the time resource,
The plurality of symbols are 14 symbols, the plurality of position candidates are the heads of the first symbol and the eighth symbol in the time resource,
In any case of the plurality of position candidates, the PUSCH data generated by the same transport block size is received.
Integrated circuit. The PUSCH ends at least at a boundary in the time resource,
The integrated circuit according to claim 17. The time resource is notified before a Listen-Before-Talk (LBT) result is obtained in the user equipment,
The integrated circuit according to claim 17. Channel access by Listen-Before-Talk (LBT) in user equipment fails if the channel is busy,
The integrated circuit according to claim 17. If channel access by Listen-Before-Talk (LBT) in the user equipment fails, LBT is performed again in the time resource.
The integrated circuit according to claim 17. The one position is determined from the position candidates based on a result of channel access by Listen-Before-Talk (LBT) in the user equipment.
The integrated circuit according to claim 17. The time resource is a subframe,
The integrated circuit according to claim 17. Receiving the PUSCH using licensed-assisted access (LAA),
The integrated circuit according to claim 17.