User equipment, communication method, base station and integrated circuit

Abstract

Provided are user equipment, communication methods, base stations, and integrated circuits. The user equipment includes: a receiving unit, receiving an uplink UL grant, the grant indicating a subframe for a physical uplink shared channel PUSCH; a circuit, performing a listen-before-talk LBT process; and a sending unit, based on a result of the LBT process, sending the PUSCH in a starting position selected from a plurality of candidate starting positions in the subframe, wherein the plurality of candidate starting positions include a first symbol and an eighth symbol in the subframe.

Description

[0001] This application is a divisional application of the invention patent application with the application date of September 25, 2015, application number: 201580083285.2, and invention name: "User Equipment and Wireless Communication Method". Technical Field

[0002] The present disclosure relates to the field of wireless communications, and in particular, to a user equipment (UE) and a wireless communication method for License Assisted Access (LAA). Background Art

[0003] The rapid growth of mobile data forces operators to use limited spectrum with higher and higher efficiency, while a large amount of unlicensed spectrum is only used inefficiently through Wi-Fi, Bluetooth, etc. LTE-U (LTE-Unlicensed) and LAA (Licensed Assisted Access) can extend the LTE spectrum to the unlicensed band, which will directly and dramatically expand the LTE network capacity. Summary of the invention

[0004] One non-limiting and exemplary embodiment provides a method of increasing the possibility that a PUSCH may be transmitted in a scheduled subframe after LBT (Listen Before Talk).

[0005] In a first general aspect of the present disclosure, a user equipment for licensed assisted access (LAA) is provided, comprising: a receiving unit, receiving an UL grant for scheduling a subframe for uplink (UL) transmission; a first circuit, performing listen-before-talk (LBT); and a sending unit, when the LBT is successful, sending a first physical uplink shared channel (PUSCH) in the scheduled subframe starting from one available starting position among multiple candidate starting positions in the scheduled subframe.

[0006] In a second general aspect of the present disclosure, a wireless communication method for authorized assisted access (LAA) performed by a user equipment is provided, comprising: receiving an UL grant for scheduling a subframe for uplink (UL) transmission; performing listen-before-talk (LBT); and if the LBT is successful, sending a physical uplink shared channel (PUSCH) in the scheduled subframe starting from one available starting position among multiple candidate starting positions in the scheduled subframe.

[0007] In a third general aspect of the present disclosure, a user equipment is provided, comprising: a receiving unit, receiving an uplink UL grant, the grant indicating a subframe for a physical uplink shared channel PUSCH; a circuit, performing a listen-before-talk (LBT) process; and a sending unit, based on a result of the LBT process, sending the PUSCH in a starting position selected from a plurality of candidate starting positions in the subframe, wherein the plurality of candidate starting positions include a first symbol and an eighth symbol in the subframe.

[0008] In a fourth general aspect of the present disclosure, a communication method is provided, comprising: receiving an uplink UL grant indicating a subframe for a physical uplink shared channel PUSCH; performing a listen-before-talk (LBT) process; and sending the PUSCH in a starting position selected from a plurality of candidate starting positions in the subframe based on a result of the LBT process, wherein the plurality of candidate starting positions include a first symbol and an eighth symbol in the subframe.

[0009] In the fifth general aspect of the present disclosure, a base station is provided, comprising: a sending unit, sending an uplink UL grant, the grant indicating a subframe for a physical uplink shared channel PUSCH; a receiving unit, receiving the PUSCH in a starting position selected from a plurality of candidate starting positions in the subframe based on a result of an LBT process, wherein the plurality of candidate starting positions include a first codeword and an eighth codeword in the subframe.

[0010] In a sixth general aspect of the present disclosure, a communication method is provided, comprising: sending an uplink UL grant indicating a subframe for a physical uplink shared channel PUSCH; receiving the PUSCH in a starting position selected from a plurality of candidate starting positions in the subframe based on a result of an LBT process, wherein the plurality of candidate starting positions include a first symbol and an eighth symbol in the subframe.

[0011] In a seventh general aspect of the present disclosure, an integrated circuit is provided, comprising: a receiving circuit, controlling reception of an uplink UL grant, the grant indicating a subframe for a physical uplink shared channel PUSCH; an executing circuit, controlling execution of a listen-before-talk (LBT) process; and a sending circuit, controlling, based on a result of the LBT process, sending the PUSCH in a starting position selected from a plurality of candidate starting positions in the subframe, wherein the plurality of candidate starting positions include a first symbol and an eighth symbol in the subframe.

[0012] In an eighth general aspect of the present disclosure, an integrated circuit is provided, comprising: a transmitting circuit, controlling the sending of an uplink UL grant, the grant indicating a subframe for a physical uplink shared channel PUSCH; a receiving circuit, controlling, based on a result of an LBT process, receiving the PUSCH in a starting position selected from a plurality of candidate starting positions in the subframe, wherein the plurality of candidate starting positions include a first symbol and an eighth symbol in the subframe.

[0013] It should be noted that the general or specific embodiments may be implemented as a system, a method, an integrated circuit, a computer program, a storage medium, or any selective combination thereof.

[0014] Additional benefits and advantages of the disclosed embodiments will become apparent from the specification and drawings. Benefits and / or advantages may be obtained individually from the various embodiments and features of the specification and drawings, and these embodiments and features do not need to be provided in their entirety to obtain one or more of such benefits and / or advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The foregoing and other features of the present disclosure will become more fully apparent from the following description and appended claims taken in conjunction with the accompanying drawings. Understanding that these drawings depict only several embodiments in accordance with the present disclosure and are therefore not to be considered limiting of its scope, the present disclosure will be described with additional specificity and detail through use of the accompanying drawings, in which:

[0016] Figure 1 The case of using partial subframes is schematically shown;

[0017] Figure 2 A flowchart of a wireless communication method according to an embodiment of the present disclosure is shown;

[0018] Figure 3 A block diagram schematically shows a UE according to an embodiment of the present disclosure;

[0019] Figure 4 Schematically illustrating an embodiment of the present disclosure in which there are two candidate starting positions for PUSCH in a subframe;

[0020] Figure 5 Schematically illustrating RE mapping according to an embodiment of the present disclosure;

[0021] Figure 6 Schematically illustrating forming a time slot length PUSCH by using frequency hopping within a subframe according to an embodiment of the present disclosure;

[0022] Figure 7 Schematically illustrating forming a one-slot length PUSCH by using mapping for two-slot PUSCH according to an embodiment of the present disclosure;

[0023] Figure 8 Schematically illustrating an exemplary UL subframe structure according to an embodiment of the present disclosure; and

[0024] Fig. 9 A burst is schematically shown with a partial subframe at the end of the burst to occupy the entire burst. DETAILED DESCRIPTION

[0025] In the following detailed description, reference is made to the accompanying drawings which form a part thereof. In the drawings, similar symbols generally identify similar components unless the context dictates otherwise. It will be readily understood that the various aspects of the present disclosure may be arranged, substituted, combined and designed in a wide variety of different configurations, all of which are expressly contemplated and form a part of the present disclosure.

[0026] Unlike distributed coordination systems such as Wi-Fi, LTE is an eNB-centric system in which both downlink and uplink data transmissions are scheduled by the eNB. UL grants for PUSCH (Physical Uplink Shared Channel) should be sent before the granted subframe (e.g., 4ms before the granted subframe). On the other hand, according to some regional requirements such as Europe, LBT (Listen Before Talk) is required for the transmitting unit, which can be the eNB or the UE. Since the LBT result at the granted subframe is unknown during the time of sending the UL grant, the scheduling overhead and delay will increase when the UL grant has been sent but the UE cannot obtain the channel due to LBT failure.

[0027] In order to increase the possibility that PUSCH can be sent at a scheduled subframe after LBT, a PUSCH that can be flexibly started at a position within a scheduled subframe subject to LBT is introduced. Hereinafter, a subframe shorter than a normal subframe is referred to as a partial subframe, and a PUSCH carried in a partial subframe is referred to as a partial PUSCH. Figure 1 The case of using partial subframes is schematically shown. Figure 1 As shown in FIG. 1 , the UL grant is sent from the eNB to the UE before the scheduled subframe. The UE performs LBT just before the scheduled subframe, but LBT fails, that is, the channel is busy. In this case, the UE cannot send PUSCH from the subframe start boundary of the scheduled subframe. Then, the UE can perform LBT again within the scheduled subframe. For example, Figure 1As shown, if LBT within a scheduled subframe is successful, according to the present disclosure, a PUSCH may be sent starting from a position within the scheduled subframe (e.g., starting from the start of the second time slot of the scheduled subframe). The PUSCH may end at a subframe end boundary of the scheduled subframe. A PUSCH starting from a position within the scheduled subframe and ending at a subframe end boundary of the scheduled subframe is shorter than one subframe and may be referred to as a partial PUSCH.

[0028] According to an embodiment of the present disclosure, a wireless communication method for LAA is provided. Figure 2 A flow chart of a wireless communication method 200 is shown. The wireless communication method 200 may be performed by a UE and includes steps 201-203. In step 201, the UE receives an UL grant that schedules a subframe for UL transmission. The UL grant may be sent by an eNB. In step 202, the UE performs listen before talk (LBT). In step 203, if the LBT is successful, the UE sends a PUSCH in the scheduled subframe starting from an available starting position among a plurality of candidate starting positions in the scheduled subframe. Specifically, the PUSCH here is the PUSCH that is first sent in a burst, and the first PUSCH sent may end at the subframe end boundary of the scheduled subframe. According to this embodiment, after the LBT is successful, the UE selects a PUSCH starting position from the available candidate positions. For example, the UE may send the PUSCH just after the LBT is successful. It should be noted that any other signal (e.g., a preamble, a reserved signal, etc.) may also be sent before the PUSCH if necessary. If there is no available candidate position after LBT or LBT is unsuccessful in a scheduled subframe, the UE shall not send PUSCH in the scheduled subframe.

[0029] The disclosed embodiment also provides a UE for LAA to execute the above communication method. Figure 3 A block diagram of a UE 300 according to an embodiment of the present disclosure is schematically shown. The UE 300 may include: a receiving unit 301, which receives a UL grant for scheduling a subframe for UL transmission; a first circuit 302, which performs LBT; and a transmitting unit 303, which, if the LBT is successful, transmits a first PUSCH in the scheduled subframe starting from one of a plurality of candidate starting positions in the scheduled subframe.

[0030] The UE 300 according to the present disclosure may optionally include: a CPU (central processing unit) 310 for executing relevant programs to process various data and control the operation of various units in the UE 300; a ROM (read only memory) 313 for storing various programs required for executing various processes and controls performed by the CPU 310; a RAM (random access memory) 315 for storing intermediate data temporarily generated during the process of processing and control performed by the CPU 310; and / or a storage unit 317 for storing various programs, data, etc. The above-mentioned receiving unit 301, the first circuit 302, the sending unit 303, the CPU 310, the ROM 313, the RAM 315 and / or the storage unit 317, etc. can be interconnected via a data and / or command bus 320, and transmit signals between each other.

[0031] The above components do not limit the scope of the present disclosure. According to one implementation of the present disclosure, the functions of the above receiving unit 301, the first circuit 302 and the sending unit 303 can be implemented by hardware, and the above CPU 310, ROM 313, RAM 315 and / or storage unit 317 may not necessarily be necessary. Alternatively, the functions of the above receiving unit 301, the first circuit 302 and the sending unit 303 can also be implemented by functional software combined with the above CPU 310, ROM 313, RAM 315 and / or storage unit 317.

[0032] As described above, in a scheduled subframe according to the UL grant sent by the eNB, PUSCH can start in multiple predetermined positions. After LBT succeeds at the UE in the scheduled subframe, the UE starts PUSCH transmission at one of the available predetermined positions. Therefore, the possibility that PUSCH can be transmitted at the scheduled subframe after LBT increases.

[0033] In an embodiment, there may be two candidate start positions in a scheduled subframe, which are respectively at the start points of two time slots of the scheduled subframe. Accordingly, there are two candidate PUSCHs corresponding to the two candidate start positions, the first candidate PUSCH (partial PUSCH) of the two candidate PUSCHs has a time slot length, and the second candidate PUSCH (normal PUSCH) of the two candidate PUSCHs has a time slot length.

[0034] Figure 4 The embodiment in which two candidate starting positions for PUSCH exist in a subframe is schematically shown. Figure 4As shown, one UL grant from the eNB can schedule one PUSCH with 2 possible lengths (i.e., 1 slot or 2 slots) in the scheduled subframe, and the PUSCH can always end at the subframe end boundary of the scheduled subframe. After LBT is successful, the UE selects the PUSCH start position from the available candidate positions. It should be noted that any other signal (e.g., preamble, reserved signal, etc.) can also be sent before the PUSCH if necessary. If there is no available candidate position after LBT or LBT is unsuccessful in the scheduled subframe, the UE will not send PUSCH in the scheduled subframe.

[0035] Since the PUSCH length is unpredictable when sending an UL grant, it is necessary to prepare a PUSCH with two possible lengths (one slot or two slots). According to the current UL grant (LTE Release 13), the RB allocation, MCS and number of transport blocks are indicated to the UE. Depending on the assumed PUSCH length, the number of REs used for PUSCH transmission can be derived separately.

[0036] There are two possible approaches regarding transport block size. The first option is to prepare two transport blocks for each PUSCH length (normal PUSCH assumes N RB allocation, and partial PUSCH assumes In other words, in an embodiment, the UE may include a second circuit that prepares two transport blocks for two candidate PUSCHs, the second candidate PUSCH (normal PUSCH) assuming N RB allocations, and the first candidate PUSCH (partial PUSCH) assuming N RB allocations. RB allocation, N is the number of allocated RBs indicated in the UL grant. Alternatively, the second option is: while preparing one transport block, reinterpret the MCS in the UL grant for part of the PUSCH (e.g., increase the modulation order and / or code rate). In other words, in an embodiment, the UE may include a second circuit that prepares one transport block for two candidate PUSCHs and reinterprets the modulation and coding scheme (MCS) indicated in the UL grant for the first candidate PUSCH.

[0037] Regarding RE mapping, it is feasible to reuse the current RE mapping (including Figure 5 The time first PUSCH data mapping, PUSCH RS, CQI / PMI, ACK / NACK, RI) is shown.

[0038] The current intra-subframe frequency hopping for PUSCH supports two time slots in different frequency bands. Figure 6The schematic diagram shows how to form a time slot length PUSCH by using frequency hopping within a subframe according to an embodiment of the present disclosure. Figure 6 As shown on the left side of , the first time slot (time slot 0) of all allocated RBs is mapped on one subband, while the second time slot (time slot 1) of all allocated RBs is mapped on another subband (within the same bandwidth as the previous bandwidth) that is several RBs away from the former subband. Thus, as Figure 6 As shown on the right side of , by combining the allocated RBs in slot 0 and the allocated RBs in slot 1 into one slot (slot 1), a one-slot length PUSCH can be obtained. That is, in the time domain, those allocated RBs are put into one slot, while in the frequency domain, they can be arranged in the original order and continuously. In other words, in an embodiment, the UE may include a third circuit that forms a first candidate PUSCH by combining the allocated RBs in slot 0 and the allocated RBs in slot 1 of a PUSCH of two slot lengths into one slot using intra-subframe frequency hopping.

[0039] Alternatively, a shortened PUSCH with N RBs x 1 slot may be used for The mapping of PUSCH to RB×2 time slots is performed, where N is the number of allocated RBs indicated in the UL grant. Figure 7 The schematic diagram shows that a time slot length PUSCH is formed by using mapping for two time slot PUSCHs according to an embodiment of the present disclosure. Figure 7 As shown, assuming that N is an even number, in the first step, RE mapping for a 2-slot PUSCH having N / 2 RBs is performed, and in the second step, each RB of the 2 slots is mapped to 2 adjacent RBs of 1 slot. When N is an even number, all allocated RBs can be occupied by a PUSCH having a length of one slot. If N is an odd number, one of the allocated RBs can be discarded for a PUSCH having a length of one slot. According to this embodiment, the UE may include a third circuit that uses a PUSCH having a length of one slot to allocate a PUSCH. The first candidate PUSCH with N RBs×1 slot is formed by mapping a two-slot length PUSCH of N RBs×2 slots, and each RB of 2 slots is mapped to 2 adjacent RBs of 1 slot.

[0040] As described above, it is possible to minimize the specification impact and UE transceiver unit modification / complexity by using slot-level candidate start positions (i.e., 2 start candidates) because reuse of RE mapping, TBS determination, and intra-subframe hopping is possible. Note that the second and third circuits can be implemented by hardware or by functional software, similar to the first circuit 302.

[0041] In another embodiment, the candidate starting positions may be in the symbol level. In the case of a normal cyclic prefix, one UL grant from the eNB may schedule a PUSCH with a maximum of 14 possible lengths (i.e., 1 to 14 SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols) in the scheduled subframe (e.g., at 4 starting positions at symbols 0 / 4 / 7 / 11). The SRS (Sounding Reference Signal) symbols (the last SC-FDMA symbol in the uplink subframe) will be excluded in the SRS subframe. After LBT succeeds, the UE selects an available PUSCH starting position. For this embodiment, PUSCH should be prepared for multiple possible lengths, and a new TBS determination (e.g., a scaling factor) based on the PUSCH length is required, except for the 13-symbol and 14-symbol lengths. Because the current transport block size table defined in 3GPP TS 36.213 (3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Layer Procedures) assumes a normal PUSCH with 14 or 12 symbols depending on the CP (Cyclic Prefix) length, a PUSCH with fewer SC-FDMA symbols will have a scaling factor applied to the current TBS in proportion to the number of PUSCH data REs. For example, the scaling factor may be calculated by dividing the number of PUSCH SC-FDMA symbols by 14. In addition, a new RE mapping starting from the first SC-FDMA symbol of the PUSCH is needed in addition to the 14-symbol length. One approach is as follows Figure 8 As shown, the current UL subframe structure aligned with the UL subframe structure is reused in the granted carrier (i.e., symbol 3 / 10 if normal CP, and symbol 2 / 8 if extended CP), and the PUSCH RS is always at a predetermined symbol. In this method, the PUSCH SC-FDMA symbol in the current UL subframe structure is truncated from the beginning. LB (Long Block) is equal to SC-FDMA symbol. Another method is to shift the UL subframe structure, i.e., in Figure 8 In this method, the UL subframe structure is truncated from the end. For a 13 SC-FDMA length of PUSCH starting from the 2nd SC-FDMA symbol, it is necessary to shift the DMRS of one SC-FDMA symbol to the right from the current subframe with SRS (in the last SC-FDMA symbol of the current uplink subframe).

[0042] In another embodiment, the transmitting unit of the UE may be further operable to: transmit a second PUSCH ending at the end of the pulse train. Note that the "first" and "second" in the "first PUSCH" and "second PUSCH" in the present disclosure do not limit the order of the PUSCHs, but only distinguish one PUSCH from another PUSCH. Based on regional regulations, the maximum length of a pulse train may be limited to, for example, 4ms in Japan and 10ms in Europe. When a UL pulse train (including an uplink transmission signal of at least one UE) has a partial subframe at the beginning, it will be beneficial for the partial subframe at the end to reach the maximum allowed occupancy, which is usually at a granularity of 1ms. There may be multiple methods for how to schedule the partial subframe at the end of the pulse train. For example, one method is to independently schedule the partial subframe at the end of the pulse train by a separate UL grant as other subframes, and another method is to implicitly schedule the partial subframe at the end of the pulse train by a UL grant of the partial subframe at the beginning of the pulse train for the same UE, such as Fig. 9 shown. Fig. 9 Schematically shows a burst with a partial subframe at the end of the burst for occupying the entire burst. Fig. 9 As shown, the partial subframe at the end of the burst is not explicitly scheduled by a separate UL grant, but is implicitly scheduled by the UL grant for the partial subframe at the beginning of the burst. 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.

[0043] In another embodiment, if the UE is scheduled to more than one subframe successively, the uplink partial subframe can be jointly scheduled and / or jointly encoded with its adjacent normal subframe. If the uplink partial subframe is at the beginning of a burst, its adjacent normal subframe is the next subframe. If the uplink partial subframe is at the end of a burst, its adjacent normal subframe is the previous normal subframe. For example, if the above-mentioned first PUSCH does not start from the subframe start boundary of the scheduled subframe, the scheduled subframe can be jointly encoded with its next subframe. If the above-mentioned second PUSCH does not end at the subframe end boundary of the last subframe of the burst, the last subframe can be jointly encoded with its previous subframe.

[0044] The present disclosure can be implemented by software, hardware or software in collaboration with hardware.Each function block used in the description of each of the above-mentioned embodiments can be implemented by LSI as an integrated circuit, and each process described in each embodiment can be controlled by LSI.They can be formed into chips individually, or a chip can be formed, thereby including some or all function blocks.They can include data input and output coupled to it.Depending on the difference in terms of the degree of integration, the LSI herein can be referred to as IC, system LSI, super LSI or ultra LSI.However, the technology realizing integrated circuit is not limited to LSI, and can be realized by using a dedicated circuit or a general-purpose processor.In addition, the FPGA (field programmable gate array) that can be programmed after manufacturing LSI or the connection and the reconfigurable processor that can reconfigure the circuit unit deployed inside LSI can be used.

[0045] Note that, without departing from the content and scope of the present disclosure, the present disclosure is intended to be variously changed or modified by those skilled in the art based on the description and known technologies set forth in the specification, and these changes and applications fall within the scope of the protection claimed. In addition, the constituent elements of the above-mentioned embodiments may be arbitrarily combined without departing from the scope of the content of the present disclosure.

[0046] The embodiments of the present disclosure may provide at least the following subject matter.

[0047] 1. A user equipment for authorization assisted access (LAA), comprising:

[0048] a receiving unit, receiving an UL grant for scheduling a subframe for uplink (UL) transmission;

[0049] The first circuit,implements Listen Before Talk (LBT);

[0050] The transmitting unit transmits a first physical uplink shared channel (PUSCH) in the scheduled subframe starting from an available starting position among a plurality of candidate starting positions in the scheduled subframe if the LBT is successful.

[0051] 2. The user equipment as described in 1,

[0052] The first PUSCH ends at a subframe end boundary of the scheduled subframe.

[0053] 3. The user equipment as described in 2,

[0054] There are two candidate starting positions in the scheduled subframe, which are respectively at the starting points of two time slots of the scheduled subframe, and there are two candidate PUSCHs corresponding to the two candidate starting positions, the first candidate PUSCH of the two candidate PUSCHs has a time slot length, and the second candidate PUSCH of the two candidate PUSCHs has a time slot length.

[0055] 4. The user equipment as described in 3, further comprising:

[0056] The second circuit prepares two transport blocks for the two candidate PUSCHs respectively.

[0057] The second candidate PUSCH assumes N resource blocks (RBs) allocation, and the first candidate PUSCH assumes RB allocation, N is the number of allocated RBs indicated in the UL grant.

[0058] 5. The user equipment as described in 3, further comprising:

[0059] A second circuit prepares a transport block for the two candidate PUSCHs,

[0060] A modulation and coding scheme (MCS) indicated in the UL grant is reinterpreted for the first candidate PUSCH.

[0061] 6. The user equipment as described in 3, further comprising:

[0062] The third circuit forms the first candidate PUSCH by combining the allocated RBs in slot 0 and the allocated RBs in slot 1 in the two slot length PUSCH into one slot using intra-subframe frequency hopping.

[0063] 7. The user equipment as described in 3, further comprising:

[0064] The third circuit, by using a The first candidate PUSCH with N RBs×1 time slot is formed by mapping two time slot length PUSCHs of N RBs×2 time slots, and each RB of 2 time slots is mapped to 2 adjacent RBs of 1 time slot.

[0065] 8. The user equipment as described in 1,

[0066] The candidate start positions are at symbol level.

[0067] 9. The user equipment as described in 1,

[0068] In case that the first PUSCH does not start from the subframe start boundary of the scheduled subframe, the scheduled subframe is jointly encoded with its next subframe.

[0069] 10. The user equipment as described in 1,

[0070] The transmitting unit further transmits a second PUSCH ending at the end of the burst.

[0071] 11. The user equipment according to 10,

[0072] In case the second PUSCH does not end at the subframe end boundary of the last subframe of the burst, the last subframe is jointly encoded with its previous subframe.

[0073] 12. A wireless communication method for License Assisted Access (LAA) performed by a user equipment, comprising:

[0074] receiving an uplink (UL) grant scheduling a subframe for an UL transmission;

[0075] Implement Listen Before Talk (LBT);

[0076] In case the LBT is successful, a first physical uplink shared channel (PUSCH) is transmitted in the scheduled subframe starting from one available starting position among a plurality of candidate starting positions in the scheduled subframe.

[0077] 13. The wireless communication method according to 12,

[0078] The first PUSCH ends at a subframe end boundary of the scheduled subframe.

[0079] 14. The wireless communication method according to 13,

[0080] There are two candidate starting positions in the scheduled subframe, which are respectively at the starting points of two time slots of the scheduled subframe, and there are two candidate PUSCHs corresponding to the two candidate starting positions, the first candidate PUSCH of the two candidate PUSCHs has a time slot length, and the second candidate PUSCH of the two candidate PUSCHs has a time slot length.

[0081] 15. The wireless communication method according to 14, further comprising:

[0082] Two transport blocks are prepared for the two candidate PUSCHs respectively.

[0083] The second candidate PUSCH assumes N resource blocks (RBs) allocation, and the first candidate PUSCH assumes RB allocation, N is the number of allocated RBs indicated in the UL grant.

[0084] 16. The wireless communication method according to 14, further comprising:

[0085] Prepare a transport block for the two candidate PUSCHs,

[0086] A modulation and coding scheme (MCS) indicated in the UL grant is reinterpreted for the first candidate PUSCH.

[0087] 17. The wireless communication method according to 14, further comprising:

[0088] The first candidate PUSCH is formed by combining the allocated RBs in slot 0 and the allocated RBs in slot 1 in the two slot length PUSCH into one slot using intra-subframe frequency hopping.

[0089] 18. The wireless communication method according to 14, further comprising:

[0090] By using for having The first candidate PUSCH with N RBs×1 time slot is formed by mapping two time slot length PUSCHs of N RBs×2 time slots, and each RB of 2 time slots is mapped to 2 adjacent RBs of 1 time slot.

[0091] 19. The wireless communication method according to 12,

[0092] The candidate start positions are at symbol level.

[0093] 20. The wireless communication method according to 12,

[0094] In case that the first PUSCH does not start from the subframe start boundary of the scheduled subframe, the scheduled subframe is jointly encoded with its next subframe.

[0095] 21. The wireless communication method according to 12, further comprising:

[0096] A second PUSCH is sent ending at the end of the burst.

[0097] 22. The wireless communication method according to 21,

[0098] In case the second PUSCH does not end at the subframe end boundary of the last subframe of the burst, the last subframe is jointly encoded with its previous subframe.

[0099] In addition, the embodiments of the present disclosure may also provide an integrated circuit including a module for executing the steps in each of the above-mentioned communication methods. In addition, the embodiments of the present disclosure may also provide a computer-readable storage medium on which a computer program including program code has been stored, which executes the steps of each of the above-mentioned communication methods when executed on a computing device.

Claims

1. A user equipment, comprising: A receiving unit, receiving an uplink UL grant, wherein the uplink UL grant indicates a subframe for a physical uplink shared channel PUSCH; The circuit performs the listen-before-speak LBT process; a transmitting unit, which transmits the PUSCH in a starting position selected from a plurality of candidate starting positions in a subframe based on a result of the LBT process, The multiple candidate starting positions include the first symbol and the eighth symbol in the subframe, Here, in the case of a PUSCH with a length of 14 symbols transmitted from the first symbol and in the case of a PUSCH with a length of 7 symbols transmitted from the eighth symbol, the same transport block size is used.

2. The user equipment according to claim 1, wherein: The PUSCH ends at least at the boundary of the subframe.

3. The user equipment according to claim 1, wherein: The first symbol is in a first half of a time resource and the eighth symbol is in a second half of the subframe.

4. The user equipment according to claim 1, wherein: The plurality of candidate start positions are defined at a symbol level.

5. The user equipment according to claim 1, wherein: The subframe is indicated from the base station prior to the result of the LBT process.

6. The user equipment according to claim 1, wherein: The PUSCH is received in the unlicensed band.

7. A communication method, comprising: receiving an uplink UL grant, wherein the uplink UL grant indicates a subframe for a physical uplink shared channel PUSCH; Perform the Listen Before Speak LBT process; transmitting the PUSCH in a starting position selected from a plurality of candidate starting positions in a subframe based on a result of the LBT process, The multiple candidate starting positions include the first symbol and the eighth symbol in the subframe, Here, in the case of a PUSCH with a length of 14 symbols transmitted from the first symbol and in the case of a PUSCH with a length of 7 symbols transmitted from the eighth symbol, the same transport block size is used.

8. The communication method according to claim 7, wherein: The PUSCH ends at least at the boundary of the subframe.

9. The communication method according to claim 7, wherein: The first symbol is in a first half of a time resource and the eighth symbol is in a second half of the subframe.

10. The communication method according to claim 7, wherein: The plurality of candidate start positions are defined at a symbol level.

11. The communication method according to claim 7, wherein: The subframe is indicated from the base station prior to the result of the LBT process.

12. The communication method according to claim 7, wherein: The PUSCH is received in the unlicensed band.

13. A base station, comprising: A sending unit, sending an uplink UL grant, wherein the uplink UL grant indicates a subframe used for a physical uplink shared channel PUSCH; a receiving unit, receiving the PUSCH in a starting position selected from a plurality of candidate starting positions in a subframe based on a result of the LBT process, The multiple candidate starting positions include the first symbol and the eighth symbol in the subframe, Here, in the case of a PUSCH with a length of 14 symbols transmitted from the first symbol and in the case of a PUSCH with a length of 7 symbols transmitted from the eighth symbol, the same transport block size is used.

14. A communication method, comprising: Sending an uplink UL grant, wherein the uplink UL grant indicates a subframe for a physical uplink shared channel PUSCH; receiving the PUSCH in a starting position selected from a plurality of candidate starting positions in a subframe based on a result of the LBT process, The multiple candidate starting positions include the first symbol and the eighth symbol in the subframe, Here, in the case of a PUSCH with a length of 14 symbols transmitted from the first symbol and in the case of a PUSCH with a length of 7 symbols transmitted from the eighth symbol, the same transport block size is used.

15. An integrated circuit comprising: A receiving circuit, controlling receiving an uplink UL grant, wherein the uplink UL grant indicates a subframe for a physical uplink shared channel PUSCH; An execution circuit controls the execution of the listen-before-talk (LBT) process; a transmitting circuit that controls the transmission of the PUSCH in a starting position selected from a plurality of candidate starting positions in a subframe based on a result of the LBT process, The multiple candidate starting positions include the first symbol and the eighth symbol in the subframe, Here, in the case of a PUSCH with a length of 14 symbols transmitted from the first symbol and in the case of a PUSCH with a length of 7 symbols transmitted from the eighth symbol, the same transport block size is used.

16. An integrated circuit comprising: A sending circuit controls sending an uplink UL grant, wherein the grant indicates a subframe for a physical uplink shared channel PUSCH; a receiving circuit that controls receiving the PUSCH in a starting position selected from a plurality of candidate starting positions in a subframe based on a result of the LBT process, The multiple candidate starting positions include the first symbol and the eighth symbol in the subframe, Here, in the case of a PUSCH with a length of 14 symbols transmitted from the first symbol and in the case of a PUSCH with a length of 7 symbols transmitted from the eighth symbol, the same transport block size is used.

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