WO2021245526A1

WO2021245526A1 - Apparatus and method of wireless communication

Info

Publication number: WO2021245526A1
Application number: PCT/IB2021/054744
Authority: WO
Inventors: Hao Lin
Original assignee: Orope France Sarl
Priority date: 2020-06-03
Filing date: 2021-05-31
Publication date: 2021-12-09

Abstract

An apparatus and a method of wireless communication are provided. The method by a user equipment (UE) includes being configured by a base station with a downlink control indicator (DCI), wherein the DCI is configured to indicate a first channel access procedure and schedule a first uplink transmission and a second uplink transmission and using the first channel access procedure indicated by the DCI for the first uplink transmission. This can solve issues in the prior art, provide a channel access relevant indication for more than one scheduled uplink transmission by a same downlink control indicator (DCI) in a shared spectrum, reduce signaling overhead, provide a good communication performance, and/or provide high reliability.

Description

APPARATUS AND METHOD OF WIRELESS COMMUNICATION

BACKGROUND OF DISCLOSURE

1. Field of the Disclosure

[0001] The present disclosure relates to the field of communication systems, and more particularly, to an apparatus and a method of wireless communication, which can provide a good communication performance and/or high reliability.

2. Description of the Related Art

[0002] In an unlicensed band, an unlicensed spectrum is a shared spectrum. Communication equipment in different communication systems can use the unlicensed spectrum as long as the unlicensed meets regulatory requirements set by countries or regions on a spectrum. There is no need to apply for a proprietary spectrum authorization from a government. [0003] In order to allow various communication systems that use the unlicensed spectrum for wireless communication to coexist friendly in the spectrum, some countries or regions specify regulatory requirements that must be met to use the unlicensed spectrum. For example, a communication device follows a listen before talk (LBT) or channel access procedure, that is, the communication device needs to perform a channel sensing before transmitting a signal on a channel. When an LBT outcome illustrates that the channel is idle, the communication device can perform signal transmission; otherwise, the communication device cannot perform signal transmission. In order to ensure fairness, once a communication device successfully occupies the channel, a transmission duration cannot exceed a maximum channel occupancy time (MCOT). [0004] On an unlicensed carrier, for a channel occupancy obtained by a base station, it may share the channel occupation time to a user equipment (UE) for transmitting an uplink signal or an uplink channel. Moreover, the base station indicates a channel access relevant indication to the UE forperforming channel access procedure. However, when the base station sends only one downlink control indicator (DCI) scheduling more than one uplink transmissions, the applicability of the indicated channel access relevant information with respect to the scheduled more than one uplink transmissions is not yet defined. [0005] Therefore, there is a need for an apparatus and a method of a channel access relevant indication for more than one scheduled uplink transmission by a same DCI in a shared spectrum, which can solve issues in the prior art.

SUMMARY

[0006] An object of the present disclosure is to propose an apparatus (such as a user equipment (UE) and/or a base station) and a method of wireless communication, which can solve issues in the prior art, provide a channel access relevant indication for more than one scheduled uplink transmission by a same downlink control indicator (DCI) in a shared spectrum, reduce signaling overhead, provide a good communication performance, and/or provide high reliability.

[0007] In a first aspect of the present disclosure, a method of wireless communication by a user equipment (UE) comprises being configured by a base station with a downlink control indicator (DCI), wherein the DCI is configured to indicate a first channel access procedure and schedule a first uplink transmission and a second uplink transmission, and using the first channel access procedure indicated by the DCI for the first uplink transmission.

[0008] In a second aspect of the present disclosure, a method of wireless communication by a base station comprises configuring, to a user equipment (UE), a downlink control indicator (DCI), wherein the DCI is configured to indicate a first channel access procedure and schedule a first uplink transmission and a second uplink transmission, and configuring the UE to use the first channel access procedure indicated by the DCI for the first uplink transmission.

[0009] In a third aspect of the present disclosure, a user equipment comprises a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor is configured by a base station with a downlink control indicator (DCI), wherein the DCI is configured to indicate a first channel access procedure and schedule a first uplink transmission and a second uplink transmission, and the processor is configured to use the first channel access procedure indicated by the DCI for the first uplink transmission.

[0010] In a fourth aspect of the present disclosure, a base station comprises a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor is configured to configure, to a user equipment (UE), a downlink control indicator (DCI), wherein the DCI is configured to indicate a first channel access procedure and schedule a first uplink transmission and a second uplink transmission, and the processor is configured to configure the UE to use the first channel access procedure indicated by the DCI for the first uplink transmission.

[0011] In a fifth aspect of the present disclosure, a non-transitory machine -readable storage medium has stored thereon instructions that, when executed by a computer, cause the computer to perform the above method.

[0012] In a sixth aspect of the present disclosure, a chip includes a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the above method.

[0013] In a seventh aspect of the present disclosure, a computer readable storage medium, in which a computer program is stored, causes a computer to execute the above method.

[0014] In an eighth aspect of the present disclosure, a computer program product includes a computer program, and the computer program causes a computer to execute the above method.

[0015] In a ninth aspect of the present disclosure, a computer program causes a computer to execute the above method.

BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to illustrate the embodiments of the present disclosure or related art more clearly, the following figures will be described in the embodiments are briefly introduced. It is obvious that the drawings are merely some embodiments of the present disclosure, a person having ordinary skill in this field can obtain other figures according to these figures without paying the premise.

[0017] FIG. 1 is a block diagram of one or more user equipments (UEs) and a base station (e.g., gNB) of communication in a communication network system according to an embodiment of the present disclosure.

[0018] FIG. 2 is a flowchart illustrating a method of wireless communication performed by a user equipment (UE) according to an embodiment of the present disclosure.

[0019] FIG. 3 is a flowchart illustrating a method of wireless communication performed by a base station according to an embodiment of the present disclosure.

[0020] FIG. 4 is a schematic diagram illustrating that a base station (e.g., gNB) sends a downlink control indicator (DCI) to schedule two uplinks, e.g., uplink 1 and uplink 2, where the two uplinks are not consecutive in time domain, and the uplink 2 is within a gNB’s channel occupancy (CO) according to an embodiment of the present disclosure.

[0021] FIG. 5 is a schematic diagram illustrating that a base station (e.g., gNB) sends a DCI to schedule two uplinks, e.g., uplink 1 and uplink 2, where the two uplinks are not consecutive in time domain, and a subset of symbols of the uplink 2 are within the gNB’s channel occupancy (CO) according to an embodiment of the present disclosure.

[0022] FIG. 6 is a schematic diagram illustrating that a base station (e.g., gNB) sends a DCI to schedule two uplinks, e.g., uplink 1 and uplink 2, where the two uplinks are not consecutive in time domain, and the uplink 2 is outside the gNB’s channel occupancy (CO) according to an embodiment of the present disclosure.

[0023] FIG. 7 is a schematic diagram illustrating that the uplink 2 is located in the same RB sets in which the uplink 1 is located according to an embodiment of the present disclosure.

[0024] FIG. 8 is a schematic diagram illustrating that the uplink 2 is located in a subset of the RB sets in which the uplink 1 is located according to an embodiment of the present disclosure. [0025] FIG. 9 is a schematic diagram illustrating that the RB sets of the uplink 2 is not covered by the uplink 1 according to an embodiment of the present disclosure.

[0026] FIG. 10 is a schematic diagram illustrating that the uplink 2 is located in a set of symbols within the maximum UE channel occupancy duration in time domain.

[0027] FIG. 11 is a block diagram of a system for wireless communication according to an embodiment of the present disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

[0028] Embodiments of the present disclosure are described in detail with the technical matters, structural features, achieved objects, and effects with reference to the accompanying drawings as follows. Specifically, the terminologies in the embodiments of the present disclosure are merely for describing the purpose of the certain embodiment, but not to limit the disclosure.

[0029] FIG. 1 illustrates that, in some embodiments, one or more user equipments (UEs) 10 and a base station (e.g., gNB) 20 for transmission adjustment in a communication network system 30 according to an embodiment of the present disclosure are provided. The communication network system 30 includes the one or more UEs 10 and the base station 20. The one or more UEs 10 may include a memory 12, a transceiver 13, and a processor 11 coupled to the memory 12 and the transceiver 13. The base station 20 may include a memory 22, a transceiver 23, and a processor 21 coupled to the memory 22 and the transceiver 23. The processor 11 or 21 may be configured to implement proposed functions, procedures and/or methods described in this description. Layers of radio interface protocol may be implemented in the processor 11 or 21. The memory 12 or 22 is operatively coupled with the processor 11 or 21 and stores a variety of information to operate the processor 11 or 21. The transceiver 13 or 23 is operatively coupled with the processor 11 or 21, and the transceiver 13 or 23 transmits and/or receives a radio signal.

[0030] The processor 11 or 21 may include application- specific integrated circuit (ASIC), other chipset, logic circuit and/or data processing device. The memory 12 or 22 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and/or other storage device. The transceiver 13 or 23 may include baseband circuitry to process radio frequency signals. When the embodiments are implemented in software, the techniques described herein can be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The modules can be stored in the memory 12 or 22 and executed by the processor 11 or 21. The memory 12 or 22 can be implemented within the processor 11 or 21 or external to the processor 11 or 21 in which case those can be communicatively coupled to the processor 11 or 21 via various means as is known in the art.

[0031] In some embodiments, the processor 11 is configured by the base station 20 with a downlink control indicator (DCI), wherein the DCI is configured to indicate a first channel access procedure and schedule a first uplink transmission and a second uplink transmission, and the processor 11 is configured to use the first channel access procedure indicated by the DCI for the first uplink transmission. This can solve issues in the prior art, provide a channel access relevant indication for more than one scheduled uplink transmission by a same downlink control indicator (DCI) in a shared spectrum, reduce signaling overhead, provide a good communication performance, and/or provide high reliability.

[0032] In some embodiments, the processor 21 is configured to configure, to the UE 10, a downlink control indicator (DCI), wherein the DCI is configured to indicate a first channel access procedure and schedule a first uplink transmission and a second uplink transmission, and the processor 21 is configured to configure the UE 10 to use the first channel access procedure indicated by the DCI for the first uplink transmission. This can solve issues in the prior art, provide a channel access relevant indication for more than one scheduled uplink transmission by a same downlink control indicator (DCI) in a shared spectrum, reduce signaling overhead, provide a good communication performance, and/or provide high reliability. [0033] FIG. 2 illustrates a method 200 of wireless communication by a user equipment (HE) according to an embodiment of the present disclosure. In some embodiments, the method 200 includes: a block 202, being configured by a base station with a downlink control indicator (DCI), wherein the DCI is configured to indicate a first channel access procedure and schedule a first uplink transmission and a second uplink transmission, and a block 204, using the first channel access procedure indicated by the DCI for the first uplink transmission. This can solve issues in the prior art, provide a channel access relevant indication for more than one scheduled uplink transmission by a same downlink control indicator (DCI) in a shared spectrum, reduce signaling overhead, provide a good communication performance, and/or provide high reliability. [0034] FIG. 3 illustrates a method 300 of wireless communication by a base station according to an embodiment of the present disclosure. In some embodiments, the method 300 includes: a block 302, configuring, to a user equipment (UE), a downlink control indicator (DCI), wherein the DCI is configured to indicate a first channel access procedure and schedule a first uplink transmission and a second uplink transmission, and a block 304, configuring the UE to use the first channel access procedure indicated by the DCI for the first uplink transmission. This can solve issues in the prior art, provide a channel access relevant indication for more than one scheduled uplink transmission by a same downlink control indicator (DCI) in a shared spectrum, reduce signaling overhead, provide a good communication performance, and/or provide high reliability.

[0035] In some embodiments, the method further comprises the UE using a type 2A channel access procedure without applying a cyclic prefix (CP) extension for the second uplink transmission if the second uplink transmission is within a channel occupancy time of the base station. In some embodiments, the method further comprises the UE using a type 1 channel access procedure without applying a CP extension for the second uplink transmission if the second uplink transmission is outside a channel occupancy time of the base station. In some embodiments, the first uplink transmission and the second uplink transmission are non-contiguous transmissions. In some embodiments, the first uplink transmission comprises a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), or a sounding reference signal (SRS). In some embodiments, the second uplink transmission comprises an SRS, a PUSCH, or a PUCCH. In some embodiments, the UE is configured to use a first channel access information to perform a second channel access procedure for the second uplink transmission.

[0036] In some embodiments, the DCI comprises a channel access indication field, and the channel access indication field indicates a second channel access information. In some embodiments, the first channel access information and/or the second channel access information comprises a channel access type and/or a cyclic prefix (CP) extension. In some embodiments, the first channel access information is same as the second channel access information. In some embodiments, the first channel access information same as the second channel access information comprises at least one of the followings: the channel access type in the first channel access information same as the channel access type in the second channel access information; or the CP extension in the first channel access information same as the CP extension in the second channel access information.

[0037] In some embodiments, the first channel access information is same as the second access information when a first condition is met. In some embodiments, the first condition is relevant to the channel access indication field in the DCI. In some embodiments, the first condition comprises the channel access indication field configured to indicate a first channel access type and/or the second uplink transmission or a subset of symbols of the second uplink transmission within or outside a channel occupancy. In some embodiments, the first channel access type comprises at least one of the followings: a type 1 channel access, a type 2A channel access, a type 2B channel access, or a type 2C channel access. In some embodiments, the first channel access information comprises a default channel access information. In some embodiments, the default channel access information comprises a default channel access type and/or a default CP extension. In some embodiments, a value of the default CP extension is equal to zero. [0038] In some embodiments, the default channel access type comprises at least one of the followings: a type 1 channel access, a type 2A channel access, or a type 2C channel access. In some embodiments, the default channel access type comprises the type 2A channel access or the type 2C channel access if the second uplink transmission is within the channel occupancy. In some embodiments, the default channel access type comprises the type 1 channel access if the second uplink transmission is outside the channel occupancy. In some embodiments, the first channel access information comprises the default channel access information when a second condition is met. In some embodiments, the second condition is relevant to the channel access indication field in the DCI.

[0039] In some embodiments, the second condition comprises the channel access indication field configured to indicate a second channel access type. In some embodiments, the second channel access type comprises at least one of the followings: a type 1 channel access, a type 2A channel access, a type 2B channel access, or a type 2C channel access. In some embodiments, the first uplink transmission is located in a first set of symbols in time domain, and/or the second uplink transmission is located in a second set of symbols in the time domain. In some embodiments, the first uplink transmission is located in a first one or more resource block (RB) sets in frequency domain and/or the second uplink transmission is located in a second one or more RB sets in the frequency domain. In some embodiments, the first set of symbols are earlier than the second set of symbols in the time domain. In some embodiments, there is a time interval defined between a last symbol of the first set of symbols and an earliest symbol of the second set of symbols. In some embodiments, the time interval is larger than a pre-defined value. In some embodiments, the pre-defined value comprises a symbol duration, 16 micro-second, or 25 micro-second.

[0040] In some embodiments, the second uplink transmission is located in the same RB sets in which the first uplink transmission is located in frequency domain or the second uplink transmission is located in a subset of the RB sets in which the first uplink transmission is located in the frequency domain. In some embodiments, the second uplink transmission is not covered by the first uplink transmission in frequency domain. In some embodiments, the channel occupancy is indicated by a second DCI and/or a radio resource control (RRC) signaling. In some embodiments, the second DCI comprises a DCI format 2_0. In some embodiments, the RRC signaling comprises a parameter configured to indicate a maximum channel occupancy in the time domain. In some embodiments, the parameter comprises semiStaticChannelAccessConfig-rl6. [0041] In some embodiments, the second uplink transmission within the channel occupancy comprises the second set of symbols within the channel occupancy in the time domain and/or the second one or more RB sets in the frequency domain are available for reception within the channel occupancy. In some embodiments, the DCI format 2_0 comprises a RB set indicator. In some embodiments, the RB set indicator indicates availability for reception for the second one or more RB sets within the channel occupancy. In some embodiments, the DCI format 2_0 comprises a slot format indicator (SFI) index and/or a channel occupancy duration. In some embodiments, the SFI index and/or the channel occupancy duration indicates the channel occupancy in the time domain. In some embodiments, the second uplink transmission comprises a PUSCH, a PUCCH, an SRS, or a physical random access channel (PRACH). In some embodiments, the DCI comprises a DCI format 0_1, a DCI format 1_1, or a DCI format 1_0.

[0042] Examples:

[0043] For uplink transmissions in a shared spectrum, a UE may perform a channel access procedure before transmitting one or more uplink transmissions in a channel. The channel access procedure comprises a type 1 channel access according to section 4.2.1.1 of TS37.213, or a type 2A channel access according to section 4.2.1.2.1 of TS37.213, or a type 2B channel access according to section 4.2.1.2.2 of TS37.213, or a type 2C channel access according to section 4.2.1.2.3 of TS37.213. [0044] FIG. 4 illustrates that a base station (e.g., gNB) sends a downlink control indicator (DCI) to schedule two uplinks, e.g., uplink 1 and uplink 2, where the two uplinks are not consecutive in time domain, and the uplink 2 is within a gNB’s channel occupancy (CO) according to an embodiment of the present disclosure. In some examples, as illustrated in FIG. 4, a HE receives a DCI that schedules two uplink transmissions, i.e., an uplink 1 and an uplink 2, where the uplink 1 and the uplink 2 are not consecutive in time domain, and the uplinkl is earlier than the uplink 2. The DCI includes a channel access indication which indicates a channel access information. The indicated channel access information can be applied for the first uplink transmission. Some embodiments present a method for the UE to determine the channel access information that is to be applied for the uplink 2 transmission. The indicated channel access information comprises a channel access type and/or a cyclic prefix (CP) extension. The UE uses the determined channel access information to perform the channel access procedure according to section 4.2.1.1 or section 4.2.1.2.1 or section 4.2.1.2.2 or section 4.2.1.2.3 of TS37.213 and to perform the second uplink transmission according to section 5.3 of TS 38.211.

[0045] The method for the UE to determine the channel access information for the uplink 2 transmission comprises the following: The UE can determine that if the indicated channel access type is type 2A channel access or type 1 channel access, the indicated channel access information can be also applied for the uplink 2 transmission.

[0046] Optionally, the UE may transmit further uplink (UL) transmissions scheduled by the scheduling DCI using Type 2A UL channel access procedures without applying a CP extension (a value of the default CP extension is equal to zero) if the further UL transmissions are within the gNB channel occupancy time. Optionally, the UE can determine that when the indicated channel access type is type 2A channel access, the indicated channel access information can be also applied for the uplink 2 transmission, if the uplink 2 transmission is within a gNB ’s channel occupancy, and/or the uplink 2 transmission is within a second channel occupancy, and/or if the uplink 2 transmission has higher or equal channel access priority class (CAPC) than the uplink 1 transmission; and/or if the channel access is successful for the uplink 1 transmission and the UE transmits the uplink 1. In some examples, the uplink 2 transmission within the gNB’s channel occupancy comprises all the symbols of the uplink 2 within the gNB’s channel occupancy in time domain (as illustrated in FIG. 4), and/or, all the RBs in frequency domain allocated for the uplink 2 transmissions are in the RB sets that are available for reception. In some examples, the RB set availability for reception is indicated for a DCI format 2_0 according to section 11.1.1 of TS38.213. But in some examples, if the UE is not configured to monitor DCI format 2_0 or the configured DCI format 2_0 does not include RB set indictor field for RB set availability indication, the UE assumes all the RB sets are available for reception within the gNB’s channel occupancy duration. The gNB’s channel occupancy is indicated by a format 2_0 by either SFI index field or channel occupancy duration field, or indicated by semiStaticChannelAccessConfig-rl6 if the system is in semi-static channel access mode, i.e., ChannelAccessMode-rl6 =' semi- static'.

[0047] FIG. 5 illustrates that a base station (e.g., gNB) sends a DCI to schedule two uplinks, e.g., uplink 1 and uplink 2, where the two uplinks are not consecutive in time domain, and a subset of symbols of the uplink 2 are within the gNB’s channel occupancy (CO) according to an embodiment of the present disclosure. FIG. 6 illustrates that a base station (e.g., gNB) sends a DCI to schedule two uplinks, e.g., uplink 1 and uplink 2, where the two uplinks are not consecutive in time domain, and the uplink 2 is outside the gNB ’ s channel occupancy (CO) according to an embodiment of the present disclosure. In some examples, as long as one symbol of the set of symbols, in which the uplink 2 transmission is located, is outside a channel occupancy, as illustrated in FIG. 5 or FIG. 6, it is understood that the uplink 2 is outside the channel occupancy, wherein the channel occupancy comprises the following: the gNB channel occupancy, or the maximum UE channel occupancy, or the second channel occupancy. Optionally, the UE may transmit further uplink (UL) transmissions using Type 1 channel access procedure, without applying a CP extension (a value of the default CP extension is equal to zero) if the further UL transmissions are outside the gNB channel occupancy time. Optionally, the UE may transmit further uplink (UL) transmissions scheduled by the scheduling DCI using Type 2A UL channel access procedures without applying a CP extension (a value of the default CP extension is equal to zero) if the further UL transmissions are within the gNB channel occupancy time.

[0048] In some examples, when the uplink transmission is SRS or PUCCH, the CAPC of the uplink transmission is fixed to the highest priority, e.g., CAPC value=l according to table 4.2.1-1 of TS 37.213. When the uplink transmission is PUSCH, the CAPC is indicated by the DCI, or the CAPC is determined by UE itself based on the traffic carried in the PUSCH. Optionally, if the uplink 1 is SRS or PUCCH, and the uplink 2 is PUSCH, the CAPC of the uplink 2 is indicated by the DCI. On the other hand, if the uplink 1 is PUSCH and the uplink 2 is SRS or PUCCH, the CAPC of the uplink 1 is indicated by the DCI. In some examples, the uplink 2 transmission within the second channel occupancy comprises: all the symbols of the uplink 2 are within the gNB’s channel occupancy in time domain and all the RBs in frequency domain allocated for the uplink 2 transmissions are located in the same RB sets or a subset of the RB sets in which the uplink 1 transmission is located. Optionally, a value of the CP extension for the uplink 2 transmission is equal to zero. Optionally, the CP extension for the uplink 2 transmission is the indicated The CP extension in the DCI.

[0049] PIG. 7 illustrates that the uplink 2 is located in the same RB sets in which the uplink 1 is located according to an embodiment of the present disclosure. In some examples, as illustrated in PIG. 7, where the uplink 1 is located in two RB sets, i.e., RB set 0 and RB set 1, and an uplink 2 is located in RB set 0 and RB set 1. Thus, the uplink 2 is called to be located in the same RB sets in which the uplink 1 is located.

[0050] PIG. 8 illustrates that the uplink 2 is located in a subset of the RB sets in which the uplink 1 is located according to an embodiment of the present disclosure. In some examples, as illustrated in FIG. 8, where the uplink 1 is located in two RB sets, i.e., RB set 0 and RB set 1, and an uplink 2 is located in RB set 0. Thus, all the RB sets in which the uplink 2 is located are also the RB sets in which the uplink 1 is located, but at least one RB set, in which the uplink 1 is located, does not contain the resource for the uplink 2 transmission. In this case, the uplink 2 is called to be located in the subset of the RB sets in which the uplink 1 is located.

[0051] FIG. 9 illustrates that the RB sets of the uplink 2 is not covered by the uplink 1 according to an embodiment of the present disclosure. In some examples, as illustrated in FIG. 9, where the uplink 1 is located in two RB sets, i.e., RB set 0 and RB set 1, and an uplink 2 is located in RB set 1 and RB set 2. Thus, at least there is one RB set in which the uplink 2 is located but the uplink 1 is not located, the uplink 2 is called to be located in the RB sets not covered by the uplink 1 transmission.

[0052] FIG. 10 illustrates that the uplink 2 is located in a set of symbols within the maximum UE channel occupancy duration in time domain. Optionally, the UE may transmit further uplink (UL) transmissions using Type 1 channel access procedure, without applying a CP extension (a value of the default CP extension is equal to zero) if the further UL transmissions are outside the gNB channel occupancy time. Optionally, the UE may determine that when the indicated channel access type is type 1 channel access, the channel access type for the uplink 2 transmission is type 2A channel access, if the channel access is successful for the uplink 1 transmission and the UE transmits the uplink 1, and/or, if the uplink 2 transmission is within the maximum UE channel occupancy duration, and/or, if the uplink 2 transmission has higher or equal CAPC than the uplink 1. In some examples, the uplink 2 transmission within the maximum UE channel occupancy duration comprises that the uplink 2 transmission located in the set of symbols that are within the maximum UE channel occupancy duration in time domain (as illustrated in FIG.10), and/or, in frequency domain, the uplink 2 transmission is located in the same RB sets or a subset of the RB sets in which the uplink 1 transmission is located. The maximum UE channel occupancy duration is determined according to section 4.2.1 and table 4.2.1-1 of TS 37.213. Optionally, the CP extension for the uplink 2 transmission is zero. Optionally, the CP extension for the uplink 2 transmission is the indicated The CP extension in the DCI.

[0053] Optionally, the UE may transmit further uplink (UL) transmissions scheduled by the scheduling DCI using Type 2A UL channel access procedures without applying a CP extension (a value of the default CP extension is equal to zero) if the further UL transmissions are within the gNB channel occupancy time. Optionally, the UE may determine that when the indicated channel access type is type 2B channel access, the indicated channel access information can be also applied for the uplink 2 transmission. Optionally, when the indicated channel access type is type 2B channel access, the indicated channel access information can be also applied for the uplink 2 transmission, if the uplink 2 transmission is within the gNB’s channel occupancy, and/or, if the uplink 2 transmission is within the second channel occupancy, and/or, if the channel access is successful for the uplink 1 transmission and the UE transmits the uplink 1, and/or, if a gap between the end of the uplink 1 transmission and the start of the uplink 2 transmission is smaller than a pre-defined time interval, and/or, if the uplink 2 transmission has higher or equal channel access priority class (CAPC) than the uplink 1 transmission. In some examples, the time interval is relevant to one symbol, and/or 16 micro-second, and/or 25 micro-second. Optionally, the UE may determine the CP extension for the uplink 2 transmission is N symbol duration minus 16 micro-second, or N symbol duration minus 25 micro- second, where N is an integer and the N symbol duration is the duration of the last N symbols prior to the earliest symbol of the allocated symbols for the uplink 2 transmission. In some examples, N=l.

[0054] Optionally, the UE may transmit further uplink (UL) transmissions scheduled by the scheduling DCI using Type 2A UL channel access procedures without applying a CP extension (a value of the default CP extension is equal to zero) if the further UL transmissions are within the gNB channel occupancy time. Optionally, the UE may determine that when the indicated channel access type is type 2B channel access, channel access type for the uplink 2 transmission is type 2C channel access. Optionally, when the indicated channel access type is type 2B channel access, channel access type for the uplink 2 transmission is type 2C channel access, if the uplink 2 transmission is within the gNB’s channel occupancy, and/or, if the uplink 2 transmission is within the second channel occupancy, and/or, if the channel access is successful for the uplink 1 transmission and the UE transmits the uplink 1, and/or, if a gap between the end of the uplink 1 transmission and the start of the uplink 2 transmission is smaller than the time interval, and/or, if the uplink 2 transmission has higher or equal channel access priority class (CAPC) than the uplink 1 transmission, and/or if the duration of the uplink 2 transmission is smaller or equal to 584 micro-second, and/or if the duration of the uplink 2 transmission plus the uplink 1 transmission is smaller or equal to 584 micro-second. Optionally, a value of the CP extension for the uplink 2 transmission is equal to zero. Optionally, the CP extension for the uplink 2 transmission is the indicated The CP extension in the DCI.

[0055] Optionally, the UE may transmit further uplink (UL) transmissions scheduled by the scheduling DCI using Type 2A UL channel access procedures without applying a CP extension (a value of the default CP extension is equal to zero) if the further UL transmissions are within the gNB channel occupancy time. Optionally, the UE may determine that when the indicated channel access type is type 2B channel access, channel access type for the uplink 2 transmission is type 2A channel access. Optionally, when the indicated channel access type is type 2B channel access, channel access type for the uplink 2 transmission is type 2A channel access, if the uplink 2 transmission is within the gNB’s channel occupancy, and/or, if the uplink 2 transmission is within the second channel occupancy, and/or, if the channel access is successful for the uplink 1 transmission and the UE transmits the uplink 1, and/or, if a gap between the end of the uplink 1 transmission and the start of the uplink 2 transmission is smaller than the time interval, and/or, if the uplink 2 transmission has higher or equal channel access priority class (CAPC) than the uplink 1 transmission. Optionally, the CP extension for the uplink transmission is the indicated The CP extension in the DCI or a default CP extension. Optionally, a value of the default CP extension is zero. [0056] Optionally, the UE may determine that when the indicated channel access type is type 2C channel access, the indicated channel access information is also applied for the uplink 2 transmission. Optionally, when the indicated channel access type is type 2C channel access, the indicated channel access information can be also applied for the uplink 2 transmission, if the uplink 2 transmission is within the gNB’s channel occupancy, and/or, if the uplink 2 transmission is within the second channel occupancy, and/or, if the channel access is successful for the uplink 1 transmission and the UE transmits the uplink 1, and/or, if a gap between the end of the uplink 1 transmission and the start of the uplink 2 transmission is smaller than the time interval, and/or, if the uplink 2 transmission has higher or equal channel access priority class (CAPC) than the uplink 1 transmission, and/or, if the duration of the uplink 2 transmission is smaller or equal to 584 micro-second, and/or if the duration of the uplink 2 transmission plus the uplink 1 transmission is smaller or equal to 584 micro-second. Optionally, a value of the CP extension for the uplink 2 transmission is equal to zero. Optionally, the CP extension for the uplink 2 transmission is the indicated The CP extension in the DCI.

[0057] Optionally, the UE may transmit further uplink (UL) transmissions scheduled by the scheduling DCI using Type 2A UL channel access procedures without applying a CP extension (a value of the default CP extension is equal to zero) if the further UL transmissions are within the gNB channel occupancy time. Optionally, the UE may determine that when the indicated channel access type is type 2C channel access, channel access type for the uplink 2 transmission is type 2A channel access. Optionally, when the indicated channel access type is type 2C channel access, channel access type for the uplink 2 transmission is type 2A channel access, if the uplink 2 transmission is within the gNB’s channel occupancy, and/or, if the uplink 2 transmission is within the second channel occupancy, and/or, if the channel access is successful for the uplink 1 transmission and the UE transmits the uplink 1, and/or, if a gap between the end of the uplink 1 transmission and the start of the uplink 2 transmission is smaller than the time interval, and/or, if the uplink 2 transmission has higher or equal channel access priority class (CAPC) than the uplink 1 transmission, and/or if the duration of the uplink 2 transmission is smaller or equal to 584 micro-second, and/or if the duration of the uplink 2 transmission plus the uplink 1 transmission is smaller or equal to 584 micro-second. Optionally, a value of the CP extension for the uplink 2 transmission is equal to zero. Optionally, the CP extension for the uplink 2 transmission is the indicated The CP extension in the DCI.

[0058] Optionally, the UE may transmit further uplink (UL) transmissions scheduled by the scheduling DCI using Type 2A UL channel access procedures without applying a CP extension (a value of the default CP extension is equal to zero) if the further UL transmissions are within the gNB channel occupancy time. Optionally, the UE may determine that when the indicated channel access type is type 2C channel access, channel access type for the uplink 2 transmission is type 2B channel access. Optionally, when the indicated channel access type is type 2C channel access, channel access type for the uplink 2 transmission is type 2B channel access, if the uplink 2 transmission is within the gNB’s channel occupancy, and/or, if the uplink 2 transmission is within the second channel occupancy, and/or, if the channel access is successful for the uplink 1 transmission and the UE transmits the uplink 1, and/or, if a gap between the end of the uplink 1 transmission and the start of the uplink 2 transmission is smaller than the time interval, and/or, if the uplink 2 transmission has higher or equal channel access priority class (CAPC) than the uplink 1 transmission, and/or if the duration of the uplink 2 transmission is smaller or equal to 584 micro-second, and/or if the duration of the uplink 2 transmission plus the uplink 1 transmission is smaller or equal to 584 micro-second. Optionally, a value of the CP extension for the uplink 2 transmission is equal to zero. Optionally, the CP extension for the uplink 2 transmission is the indicated The CP extension in the DCI. Optionally, in some examples, when the indicated channel access type is the type 2A channel access or the type 2B channel access or the type 2C channel access, the channel access type for the uplink 2 transmission is type 1 channel access.

[0059] Commercial interests for some embodiments are as follows. 1. Solving issues in the prior art. 2. Providing a channel access relevant indication for more than one scheduled uplink transmission by a same downlink control indicator (DCI) in a shared spectrum. 3. Reducing signaling overhead. 4. Providing a good communication performance. 5. Providing a high reliability. 6. Some embodiments of the present disclosure are used by 5G-NR chipset vendors, V2X communication system development vendors, automakers including cars, trains, trucks, buses, bicycles, moto-bikes, helmets, and etc., drones (unmanned aerial vehicles), smartphone makers, communication devices for public safety use, AR/VR device maker for example gaming, conference/seminar, education purposes. Some embodiments of the present disclosure are a combination of “teclmiques/processes” that can be adopted in 3 GPP specification to create an end product. Some embodiments of the present disclosure could be adopted in the 5G NR unlicensed band communications. Some embodiments of the present disclosure propose technical mechanisms.

[0060] FIG. 11 is a block diagram of an example system 700 for wireless communication according to an embodiment of the present disclosure. Embodiments described herein may be implemented into the system using any suitably configured hardware and/or software. FIG. 11 illustrates the system 700 including a radio frequency (RF) circuitry 710, a baseband circuitry 720, an application circuitry 730, a memory/storage 740, a display 750, a camera 760, a sensor 770, and an input/output (I/O) interface 780, coupled with each other at least as illustrated. The application circuitry 730 may include a circuitry such as, but not limited to, one or more single-core or multi-core processors. The processors may include any combination of general-purpose processors and dedicated processors, such as graphics processors, application processors. The processors may be coupled with the memory/storage and configured to execute instructions stored in the memory/storage to enable various applications and/or operating systems running on the system.

[0061] The baseband circuitry 720 may include circuitry such as, but not limited to, one or more single-core or multi core processors. The processors may include a baseband processor. The baseband circuitry may handle various radio control functions that enables communication with one or more radio networks via the RF circuitry. The radio control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, etc. In some embodiments, the baseband circuitry may provide for communication compatible with one or more radio technologies. For example, in some embodiments, the baseband circuitry may support communication with an evolved universal terrestrial radio access network (EUTRAN) and/or other wireless metropolitan area networks (WMAN), a wireless local area network (WEAN), a wireless personal area network (WPAN). Embodiments in which the baseband circuitry is configured to support radio communications of more than one wireless protocol may be referred to as multi-mode baseband circuitry.

[0062] In various embodiments, the baseband circuitry 720 may include circuitry to operate with signals that are not strictly considered as being in a baseband frequency. For example, in some embodiments, baseband circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency. The RF circuitry 710 may enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium. In various embodiments, the RF circuitry may include switches, filters, amplifiers, etc. to facilitate the communication with the wireless network. In various embodiments, the RF circuitry 710 may include circuitry to operate with signals that are not strictly considered as being in a radio frequency. For example, in some embodiments, RF circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency.

[0063] In various embodiments, the transmitter circuitry, control circuitry, or receiver circuitry discussed above with respect to the user equipment, eNB, or gNB may be embodied in whole or in part in one or more of the RF circuitry, the baseband circuitry, and/or the application circuitiy. As used herein, “circuitry” may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group), and/or a memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable hardware components that provide the described functionality. In some embodiments, the electronic device circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules. In some embodiments, some or all of the constituent components of the baseband circuitry, the application circuitry, and/or the memory/storage may be implemented together on a system on a chip (SOC). The memory/storage 740 may be used to load and store data and/or instructions, for example, for system. The memory/storage for one embodiment may include any combination of suitable volatile memory, such as dynamic random access memory (DRAM)), and/or non-volatile memory, such as flash memory.

[0064] In various embodiments, the I/O interface 780 may include one or more user interfaces designed to enable user interaction with the system and/or peripheral component interfaces designed to enable peripheral component interaction with the system. User interfaces may include, but are not limited to a physical keyboard or keypad, a touchpad, a speaker, a microphone, etc. Peripheral component interfaces may include, but are not limited to, a non-volatile memory port, a universal serial bus (USB) port, an audio jack, and a power supply interface. In various embodiments, the sensor 770 may include one or more sensing devices to determine environmental conditions and/or location information related to the system. In some embodiments, the sensors may include, but are not limited to, a gyro sensor, an accelerometer, a proximity sensor, an ambient light sensor, and a positioning unit. The positioning unit may also be part of, or interact with, the baseband circuitry and/or RF circuitry to communicate with components of a positioning network, e.g., a global positioning system (GPS) satellite. [0065] In various embodiments, the display 750 may include a display, such as a liquid crystal display and a touch screen display. In various embodiments, the system 700 may be a mobile computing device such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, an ultrabook, a smartphone, an AR/VR glasses, etc. In various embodiments, system may have more or less components, and/or different architectures. Where appropriate, methods described herein may be implemented as a computer program. The computer program may be stored on a storage medium, such as a non-transitory storage medium.

[0066] A person having ordinary skill in the art understands that each of the units, algorithm, and steps described and disclosed in the embodiments of the present disclosure are realized using electronic hardware or combinations of software for computers and electronic hardware. Whether the functions run in hardware or software depends on the condition of application and design requirement for a technical plan. A person having ordinary skill in the art can use different ways to realize the function for each specific application while such realizations should not go beyond the scope of the present disclosure. It is understood by a person having ordinary skill in the art that he/she can refer to the working processes of the system, device, and unit in the above-mentioned embodiment since the working processes of the above-mentioned system, device, and unit are basically the same. For easy description and simplicity, these working processes will not be detailed. [0067] It is understood that the disclosed system, device, and method in the embodiments of the present disclosure can be realized with other ways. The above-mentioned embodiments are exemplary only. The division of the units is merely based on logical functions while other divisions exist in realization. It is possible that a plurality of units or components are combined or integrated in another system. It is also possible that some characteristics are omitted or skipped. On the other hand, the displayed or discussed mutual coupling, direct coupling, or communicative coupling operate through some ports, devices, or units whether indirectly or communicatively by ways of electrical, mechanical, or other kinds of forms.

[0068] The units as separating components for explanation are or are not physically separated. The units for display are or are not physical units, that is, located in one place or distributed on a plurality of network units. Some or all of the units are used according to the purposes of the embodiments. Moreover, each of the functional units in each of the embodiments can be integrated in one processing unit, physically independent, or integrated in one processing unit with two or more than two units.

[0069] If the software function unit is realized and used and sold as a product, it can be stored in a readable storage medium in a computer. Based on this understanding, the technical plan proposed by the present disclosure can be essentially or partially realized as the form of a software product. Or, one part of the technical plan beneficial to the conventional technology can be realized as the form of a software product. The software product in the computer is stored in a storage medium, including a plurality of commands for a computational device (such as a personal computer, a server, or a network device) to run all or some of the steps disclosed by the embodiments of the present disclosure. The storage medium includes a USB disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a floppy disk, or other kinds of media capable of storing program codes.

[0070] While the present disclosure has been described in connection with what is considered the most practical and preferred embodiments, it is understood that the present disclosure is not limited to the disclosed embodiments but is intended to cover various arrangements made without departing from the scope of the broadest interpretation of the appended claims.

Claims

What is claimed is:

1. A wireless communication method by a user equipment (UE), comprising: being configured by a base station with a downlink control indicator (DCI), wherein the DCI is configured to indicate a first channel access procedure and schedule a first uplink transmission and a second uplink transmission; and using the first channel access procedure indicated by the DCI for the first uplink transmission.

2. The method of claim 1, further comprising using a type 2A channel access procedure without applying a cyclic prefix (CP) extension for the second uplink transmission if the second uplink transmission is within a channel occupancy time of the base station.

3. The method of claim 1 or 2, further comprising using a type 1 channel access procedure without applying a CP extension for the second uplink transmission if the second uplink transmission is outside a channel occupancy time of the base station.

4. The method of any one of claims 1 to 3, wherein the first uplink transmission and the second uplink transmission are non contiguous transmissions.

5. The method of any one of claims 1 to 4, wherein the first uplink transmission comprises a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), or a sounding reference signal (SRS).

6. The method of any one of claims 1 to 5, wherein the second uplink transmission comprises an SRS, a PUSCH, or a PUCCH.

7. The method of any one of claims 1 to 6, wherein the UE is configured to use a first channel access information to perform a second channel access procedure for the second uplink transmission.

8. The method of claim 7, wherein the DCI comprises a channel access indication field, and the channel access indication field indicates a second channel access information.

9. The method of claim 8, wherein the first channel access information and/or the second channel access information comprises a channel access type and/or a cyclic prefix (CP) extension.

10. The method of claim 8 or 9, wherein the first channel access information is same as the second channel access information.

11. The method of claim 10, wherein the first channel access information same as the second channel access information comprises at least one of the followings: the channel access type in the first channel access information same as the channel access type in the second channel access information; or the CP extension in the first channel access information same as the CP extension in the second channel access information.

12. The method of any one of claims 8 to 11, wherein the first channel access information is same as the second access information when a first condition is met.

13. The method of claim 12, wherein the first condition is relevant to the channel access indication field in the DCI.

14. The method of claim 13, wherein the first condition comprises the channel access indication field configured to indicate a first channel access type and/or the second uplink transmission or a subset of symbols of the second uplink transmission within or outside a channel occupancy.

15. The method of claim 14, wherein the first channel access type comprises at least one of the followings: a type 1 channel access, a type 2A channel access, a type 2B channel access, or a type 2C channel access.

16. The method of any one of claims 7 to 15, wherein the first channel access information comprises a default channel access information.

17. The method of claim 16, wherein the default channel access information comprises a default channel access type and/or a default CP extension.

18. The method of claim 17, wherein a value of the default CP extension is equal to zero.

19. The method of any one of claims 16 to 18, wherein the default channel access type comprises at least one of the followings: a type 1 channel access, a type 2A channel access, or a type 2C channel access.

20. The method of claim 19, wherein the default channel access type comprises the type 2A channel access or the type 2C channel access if the second uplink transmission is within the channel occupancy.

21. The method of claim 19, wherein the default channel access type comprises the type 1 channel access if the second uplink transmission is outside the channel occupancy.

22. The method of any one of claims 16 to 21, wherein the first channel access information comprises the default channel access information when a second condition is met.

23. The method of claim 22, wherein the second condition is relevant to the channel access indication field in the DCI.

24. The method of claim 23, wherein the second condition comprises the channel access indication field configured to indicate a second channel access type.

25. The method of claim 24, wherein the second channel access type comprises at least one of the followings: a type 1 channel access, a type 2A channel access, a type 2B channel access, or a type 2C channel access.

26. The method of any one of claims 7 to 25, wherein the first uplink transmission is located in a first set of symbols in time domain, and/or the second uplink transmission is located in a second set of symbols in the time domain.

27. The method of any one of claims 7 to 26, wherein the first uplink transmission is located in a first one or more resource block (RB) sets in frequency domain and/or the second uplink transmission is located in a second one or more RB sets in the frequency domain.

28. The method of any one of claims 26 or 27, wherein the first set of symbols are earlier than the second set of symbols in the time domain.

29. The method of any one of claims 25 to 28, wherein there is a time interval defined between a last symbol of the first set of symbols and an earliest symbol of the second set of symbols.

30. The method of claim 29, wherein the time interval is larger than a pre-defined value.

31. The method of claim 30, wherein the pre-defined value comprises a symbol duration, 16 micro-second, or 25 micro second.

32. The method of any one of claims 7 to 25, wherein the second uplink transmission is located in the same RB sets in which the first uplink transmission is located in frequency domain or the second uplink transmission is located in a subset of the RB sets in which the first uplink transmission is located in the frequency domain.

33. The method of any one of claims 7 to 25, wherein the second uplink transmission is not covered by the first uplink transmission in frequency domain.

34. The method of any one of claims 14 to 33, wherein the channel occupancy is indicated by a second DCI and/or a radio resource control (RRC) signaling.

35. The method of claim 34, wherein the second DCI comprises a DCI format 2 0.

36. The method of claim 34 or 35, wherein the RRC signaling comprises a parameter configured to indicate a maximum channel occupancy in the time domain.

37. The method of claim 36, wherein the parameter comprises semiStaticChannelAccessConfig-rl6.

38. The method of any one of claims 29 to 37, wherein the second uplink transmission within the channel occupancy comprises the second set of symbols within the channel occupancy in the time domain and/or the second one or more RB sets in the frequency domain are available for reception within the channel occupancy.

39. The method of any one of claims 35 to 38, wherein the DCI format 2 0 comprises a RB set indicator.

40. The method of claim 39, wherein the RB set indicator indicates availability for reception for the second one or more RB sets within the channel occupancy.

41. The method of any one of claims 35 to 40, wherein the DCI format 2 0 comprises a slot format indicator (SFI) index and/or a channel occupancy duration.

42. The method of claim 41, wherein the SFI index and/or the channel occupancy duration indicates the channel occupancy in the time domain.

43. The method of any one of claims 7 to 42, wherein the second uplink transmission comprises a PUSCH, a PUCCH, an SRS, or a physical random access channel (PRACH).

44. The method of any one of claims 7 to 43, wherein the DCI comprises a DCI format 0 1, a DCI format 1 1, or a DCI format 1 0.

45. A wireless communication method by abase station, comprising: configuring, to a user equipment (UE), a downlink control indicator (DCI), wherein the DCI is configured to indicate a first channel access procedure and schedule a first uplink transmission and a second uplink transmission; and configuring the UE to use the first channel access procedure indicated by the DCI for the first uplink transmission.

46. The method of claim 45, further comprising configuring the UE to use a type 2A channel access procedure without applying a cyclic prefix (CP) extension for the second uplink transmission if the second uplink transmission is within a channel occupancy time of the base station.

47. The method of claim 45 or 46, further comprising configuring the UE to use a type 1 channel access procedure without applying a CP extension for the second uplink transmission if the second uplink transmission is outside a channel occupancy time of the base station.

48. The method of any one of claims 45 to 47, wherein the first uplink transmission and the second uplink transmission are non-contiguous transmissions.

49. The method of any one of claims 45 to 48, wherein the first uplink transmission comprises a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), or a sounding reference signal (SRS).

50. The method of any one of claims 45 to 49, wherein the second uplink transmission comprises an SRS, a PUSCH, or a PUCCH.

51. The method of any one of claims 45 to 50, further comprising configuring the UE to use a first channel access information to perform a second channel access procedure for the second uplink transmission.

52. The method of claim 51, wherein the DCI comprises a channel access indication field, and the channel access indication field indicates a second channel access information.

53. The method of claim 52, wherein the first channel access information and/or the second channel access information comprises a channel access type and/or a cyclic prefix (CP) extension.

54. The method of claim 52 or 53, wherein the first channel access information is same as the second channel access information.

55. The method of claim 54, wherein the first channel access information same as the second channel access information comprises at least one of the followings: the channel access type in the first channel access information same as the channel access type in the second channel access information; or the CP extension in the first channel access information same as the CP extension in the second channel access information.

56. The method of any one of claims 52 to 55, wherein the first channel access information is same as the second access information when a first condition is met.

57. The method of claim 56, wherein the first condition is relevant to the channel access indication field in the DCI.

58. The method of claim 57, wherein the first condition comprises the channel access indication field configured to indicate a first channel access type and/or the second uplink transmission or a subset of symbols of the second uplink transmission within or outside a channel occupancy.

59. The method of claim 58, wherein the first channel access type comprises at least one of the followings: a type 1 channel access, a type 2A channel access, a type 2B channel access, or a type 2C channel access.

60. The method of any one of claims 51 to 59, wherein the first channel access information comprises a default channel access information.

61. The method of claim 60, wherein the default channel access information comprises a default channel access type and/or a default CP extension.

62. The method of claim 61, wherein a value of the default CP extension is equal to zero.

63. The method of any one of claims 60 to 62, wherein the default channel access type comprises at least one of the followings: a type 1 channel access, a type 2A channel access, or a type 2C channel access.

64. The method of claim 63, wherein the default channel access type comprises the type 2A channel access or the type 2C channel access if the second uplink transmission is within the channel occupancy.

65. The method of claim 63, wherein the default channel access type comprises the type 1 channel access if the second uplink transmission is outside the channel occupancy.

66. The method of any one of claims 60 to 65, wherein the first channel access information comprises the default channel access information when a second condition is met.

67. The method of claim 66, wherein the second condition is relevant to the channel access indication field in the DCI.

68. The method of claim 67, wherein the second condition comprises the channel access indication field configured to indicate a second channel access type.

69. The method of claim 68, wherein the second channel access type comprises at least one of the followings: a type 1 channel access, a type 2A channel access, a type 2B channel access, or a type 2C channel access.

70. The method of any one of claims 51 to 69, wherein the first uplink transmission is located in a first set of symbols in time domain, and/or the second uplink transmission is located in a second set of symbols in the time domain.

71. The method of any one of claims 51 to 70, wherein the first uplink transmission is located in a first one or more resource block (RB) sets in frequency domain and/or the second uplink transmission is located in a second one or more RB sets in the frequency domain.

72. The method of any one of claims 70 or 71, wherein the first set of symbols are earlier than the second set of symbols in the time domain.

73. The method of any one of claims 69 to 72, wherein there is a time interval defined between a last symbol of the first set of symbols and an earliest symbol of the second set of symbols.

74. The method of claim 73, wherein the time interval is larger than a pre-defined value.

75. The method of claim 74, wherein the pre-defined value comprises a symbol duration, 16 micro-second, or 25 micro second.

76. The method of any one of claims 51 to 69, wherein the second uplink transmission is located in the same RB sets in which the first uplink transmission is located in frequency domain or the second uplink transmission is located in a subset of the RB sets in which the first uplink transmission is located in the frequency domain.

77. The method of any one of claims 51 to 69, wherein the second uplink transmission is not covered by the first uplink transmission in frequency domain.

78. The method of any one of claims 58 to 77, wherein the channel occupancy is indicated by a second DCI and/or a radio resource control (RRC) signaling.

79. The method of claim 78, wherein the second DCI comprises a DCI format 2 0.

80. The method of claim 78 or 79, wherein the RRC signaling comprises a parameter configured to indicate a maximum channel occupancy in the time domain.

81. The method of claim 80, wherein the parameter comprises semiStaticChannelAccessConfig-rl6.

82. The method of any one of claims 73 to 81, wherein the second uplink transmission within the channel occupancy comprises the second set of symbols within the channel occupancy in the time domain and/or the second one or more RB sets in the frequency domain are available for reception within the channel occupancy.

83. The method of any one of claims 79 to 82, wherein the DCI format 2 0 comprises a RB set indicator.

84. The method of claim 83, wherein the RB set indicator indicates availability for reception for the second one or more RB sets within the channel occupancy.

85. The method of any one of claims 79 to 84, wherein the DCI format 2 0 comprises a slot format indicator (SFI) index and/or a channel occupancy duration.

86. The method of claim 85, wherein the SFI index and/or the channel occupancy duration indicates the channel occupancy in the time domain.

87. The method of any one of claims 51 to 86, wherein the second uplink transmission comprises a PUSCH, a PUCCH, an SRS, or a physical random access channel (PRACH).

88. The method of any one of claims 51 to 87, wherein the DCI comprises a DCI format 0 1, a DCI format 1 1, or a DCI format 1 0.

89. A user equipment (UE), comprising: a memory; a transceiver; and a processor coupled to the memory and the transceiver; wherein the processor is configured by abase station with a downlink control indicator (DCI), wherein the DCI is configured to indicate a first channel access procedure and schedule a first uplink transmission and a second uplink transmission; and wherein the processor is configured to use the first channel access procedure indicated by the DCI for the first uplink transmission.

90. The UE of claim 89, wherein the processor is configured to use a type 2A channel access procedure without applying a cyclic prefix (CP) extension for the second uplink transmission if the second uplink transmission is within a channel occupancy time of the base station.

91. The UE of claim 89 or 90, wherein the processor is configured to use a type 1 channel access procedure without applying a CP extension for the second uplink transmission if the second uplink transmission is outside a channel occupancy time of the base station.

92. The UE of any one of claims 89 to 91, wherein the first uplink transmission and the second uplink transmission are non contiguous transmissions.

93. The UE of any one of claims 89 to 92, wherein the first uplink transmission comprises a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), or a sounding reference signal (SRS).

94. The UE of any one of claims 89 to 93, wherein the second uplink transmission comprises an SRS, a PUSCH, or a PUCCH.

95. The UE of any one of claims 89 to 94, wherein the processor is configured to use a first channel access information to perform a second channel access procedure for the second uplink transmission.

96. The UE of claim 95, wherein the DCI comprises a channel access indication field, and the channel access indication field indicates a second channel access information.

97. The UE of claim 96, wherein the first channel access information and/or the second channel access information comprises a channel access type and/or a cyclic prefix (CP) extension.

98. The UE of claim 96 or 97, wherein the first channel access information is same as the second channel access information.

99. The UE of claim 98, wherein the first channel access information same as the second channel access information comprises at least one of the followings: the channel access type in the first channel access information same as the channel access type in the second channel access information; or the CP extension in the first channel access information same as the CP extension in the second channel access information.

100. The UE of any one of claims 96 to 99, wherein the first channel access information is same as the second access information when a first condition is met.

101. The UE of claim 100, wherein the first condition is relevant to the channel access indication field in the DCI.

102. The UE of claim 101, wherein the first condition comprises the channel access indication field configured to indicate a first channel access type and/or the second uplink transmission or a subset of symbols of the second uplink transmission within or outside a channel occupancy.

103. The UE of claim 102, wherein the first channel access type comprises at least one of the followings: a type 1 channel access, a type 2A channel access, a type 2B channel access, or a type 2C channel access.

104. The UE of any one of claims 95 to 103, wherein the first channel access information comprises a default channel access information.

105. The UE of claim 104, wherein the default channel access information comprises a default channel access type and/or a default CP extension.

106. The UE of claim 105, wherein a value of the default CP extension is equal to zero.

107. The UE of any one of claims 104 to 106, wherein the default channel access type comprises at least one of the followings: a type 1 channel access, a type 2A channel access, or a type 2C channel access.

108. The UE of claim 107, wherein the default channel access type comprises the type 2A channel access or the type 2C channel access if the second uplink transmission is within the channel occupancy.

109. The UE of claim 107, wherein the default channel access type comprises the type 1 channel access if the second uplink transmission is outside the channel occupancy.

110. The UE of any one of claims 104 to 109, wherein the first channel access information comprises the default channel access information when a second condition is met.

111. The UE of claim 110, wherein the second condition is relevant to the channel access indication field in the DCI.

112. The UE of claim 111, wherein the second condition comprises the channel access indication field configured to indicate a second channel access type.

113. The UE of claim 112, wherein the second channel access type comprises at least one of the followings: a type 1 channel access, a type 2A channel access, a type 2B channel access, or a type 2C channel access.

114. The UE of any one of claims 95 to 113, wherein the first uplink transmission is located in a first set of symbols in time domain, and/or the second uplink transmission is located in a second set of symbols in the time domain.

115. The UE of any one of claims 95 to 114, wherein the first uplink transmission is located in a first one or more resource block (RB) sets in frequency domain and/or the second uplink transmission is located in a second one or more RB sets in the frequency domain.

116. The UE of any one of claims 114 or 115, wherein the first set of symbols are earlier than the second set of symbols in the time domain.

117. The UE of any one of claims 113 to 116, wherein there is a time interval defined between a last symbol of the first set of symbols and an earliest symbol of the second set of symbols.

118. The UE of claim 117, wherein the time interval is larger than a pre-defined value.

119. The UE of claim 118, wherein the pre-defined value comprises a symbol duration, 16 micro-second, or 25 micro-second.

120. The UE of any one of claims 95 to 113, wherein the second uplink transmission is located in the same RB sets in which the first uplink transmission is located in frequency domain or the second uplink transmission is located in a subset of the RB sets in which the first uplink transmission is located in the frequency domain.

121. The UE of any one of claims 95 to 113, wherein the second uplink transmission is not covered by the first uplink transmission in frequency domain.

122. The UE of any one of claims 102 to 121, wherein the channel occupancy is indicated by a second DCI and/or a radio resource control (RRC) signaling.

123. The UE of claim 122, wherein the second DCI comprises a DCI format 2 0.

124. The UE of claim 122 or 123, wherein the RRC signaling comprises a parameter configured to indicate a maximum channel occupancy in the time domain.

125. The UE of claim 124, wherein the parameter comprises semiStaticChannelAccessConfig-rl6.

126. The UE of any one of claims 117 to 125, wherein the second uplink transmission within the channel occupancy comprises the second set of symbols within the channel occupancy in the time domain and/or the second one or more RB sets in the frequency domain are available for reception within the channel occupancy.

127. The UE of any one of claims 123 to 126, wherein the DCI format 2 0 comprises a RB set indicator.

128. The UE of claim 127, wherein the RB set indicator indicates availability for reception for the second one or more RB sets within the channel occupancy.

129. The UE of any one of claims 123 to 128, wherein the DCI format 2 0 comprises a slot format indicator (SFI) index and/or a channel occupancy duration.

130. The UE of claim 129, wherein the SFI index and/or the channel occupancy duration indicates the channel occupancy in the time domain.

131. The UE of any one of claims 95 to 130, wherein the second uplink transmission comprises a PUSCH, a PUCCH, an SRS, or a physical random access channel (PRACH).

132. The UE of any one of claims 95 to 131, wherein the DCI comprises a DCI format 0 1, a DCI format 1 1, or a DCI format 1 0.

133. Abase station, comprising: a memory; a transceiver; and a processor coupled to the memory and the transceiver; wherein the processor is configured to configure, to a user equipment (UE), a downlink control indicator (DCI), wherein the DCI is configured to indicate a first channel access procedure and schedule a first uplink transmission and a second uplink transmission; and wherein the processor is configured to configure the UE to use the first channel access procedure indicated by the DCI for the first uplink transmission.

134. The base station of claim 133, wherein the processor is configured to configure the UE to use a type 2A channel access procedure without applying a cyclic prefix (CP) extension for the second uplink transmission if the second uplink transmission is within a channel occupancy time of the base station.

135. The base station of claim 133 or 134, wherein the processor is configured to configure the UE to use a type 1 channel access procedure without applying a CP extension for the second uplink transmission if the second uplink transmission is outside a channel occupancy time of the base station.

136. The base station of any one of claims 133 to 135, wherein the first uplink transmission and the second uplink transmission are non-contiguous transmissions.

137. The base station of any one of claims 133 to 136, wherein the first uplink transmission comprises a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), or a sounding reference signal (SRS).

138. The base station of any one of claims 133 to 137, wherein the second uplink transmission comprises an SRS, a PUSCH, or a PUCCH.

139. The base station of any one of claims 133 to 138, wherein the processor is configured to configure the UE to use a first channel access information to perform a second channel access procedure for the second uplink transmission.

140. The base station of claim 139, wherein the DCI comprises a channel access indication field, and the channel access indication field indicates a second channel access information.

141. The base station of claim 140, wherein the first channel access information and/or the second channel access information comprises a channel access type and/or a cyclic prefix (CP) extension.

142. The base station of claim 140 or 141, wherein the first channel access information is same as the second channel access information.

143. The base station of claim 142, wherein the first channel access information same as the second channel access information comprises at least one of the followings: the channel access type in the first channel access information same as the channel access type in the second channel access information; or the CP extension in the first channel access information same as the CP extension in the second channel access information.

144. The base station of any one of claims 140 to 143, wherein the first channel access information is same as the second access information when a first condition is met.

145. The base station of claim 144, wherein the first condition is relevant to the channel access indication field in the DCI.

146. The base station of claim 145, wherein the first condition comprises the channel access indication field configured to indicate a first channel access type and/or the second uplink transmission or a subset of symbols of the second uplink transmission within or outside a channel occupancy.

147. The base station of claim 146, wherein the first channel access type comprises at least one of the followings: a type 1 channel access, a type 2A channel access, a type 2B channel access, or a type 2C channel access.

148. The base station of any one of claims 139 to 147, wherein the first channel access information comprises a default channel access information.

149. The base station of claim 148, wherein the default channel access information comprises a default channel access type and/or a default CP extension.

150. The base station of claim 149, wherein a value of the default CP extension is equal to zero.

151. The base station of any one of claims 148 to 150, wherein the default channel access type comprises at least one of the followings: a type 1 channel access, a type 2A channel access, or a type 2C channel access.

152. The base station of claim 151, wherein the default channel access type comprises the type 2A channel access or the type 2C channel access if the second uplink transmission is within the channel occupancy.

153. The base station of claim 151, wherein the default channel access type comprises the type 1 channel access if the second uplink transmission is outside the channel occupancy.

154. The base station of any one of claims 148 to 153, wherein the first channel access information comprises the default channel access information when a second condition is met.

155. The base station of claim 154, wherein the second condition is relevant to the channel access indication field in the DCI.

156. The base station of claim 155, wherein the second condition comprises the channel access indication field configured to indicate a second channel access type.

157. The base station of claim 156, wherein the second channel access type comprises at least one of the followings: a type 1 channel access, a type 2A channel access, a type 2B channel access, or a type 2C channel access.

158. The base station of any one of claims 139 to 157, wherein the first uplink transmission is located in a first set of symbols in time domain, and/or the second uplink transmission is located in a second set of symbols in the time domain.

159. The base station of any one of claims 139 to 158, wherein the first uplink transmission is located in a first one or more resource block (RB) sets in frequency domain and/or the second uplink transmission is located in a second one or more RB sets in the frequency domain.

160. The base station of any one of claims 158 or 159, wherein the first set of symbols are earlier than the second set of symbols in the time domain.

161. The base station of any one of claims 157 to 160, wherein there is a time interval defined between a last symbol of the first set of symbols and an earliest symbol of the second set of symbols.

162. The base station of claim 161, wherein the time interval is larger than a pre-defined value.

163. The base station of claim 162, wherein the pre-defined value comprises a symbol duration, 16 micro-second, or 25 micro-second.

164. The base station of any one of claims 139 to 157, wherein the second uplink transmission is located in the same RB sets in which the first uplink transmission is located in frequency domain or the second uplink transmission is located in a subset of the RB sets in which the first uplink transmission is located in the frequency domain.

165. The base station of any one of claims 139 to 157, wherein the second uplink transmission is not covered by the first uplink transmission in frequency domain.

166. The base station of any one of claims 146 to 165, wherein the channel occupancy is indicated by a second DCI and/or a radio resource control (RRC) signaling.

167. The base station of claim 166, wherein the second DCI comprises a DCI format 2 0.

168. The base station of claim 166 or 167, wherein the RRC signaling comprises a parameter configured to indicate a maximum channel occupancy in the time domain.

169. The base station of claim 168, wherein the parameter comprises semiStaticChannelAccessConfig-rl6.

170. The base station of any one of claims 161 to 169, wherein the second uplink transmission within the channel occupancy comprises the second set of symbols within the channel occupancy in the time domain and/or the second one or more RB sets in the frequency domain are available for reception within the channel occupancy.

171. The base station of any one of claims 167 to 170, wherein the DCI format 2 0 comprises a RB set indicator.

172. The base station of claim 83, wherein the RB set indicator indicates availability for reception for the second one or more RB sets within the channel occupancy.

173. The base station of any one of claims 167 to 172, wherein the DCI format 2 0 comprises a slot format indicator (SFI) index and/or a channel occupancy duration.

174. The base station of claim 173, wherein the SFI index and/or the channel occupancy duration indicates the channel occupancy in the time domain.

175. The base station of any one of claims 139 to 174, wherein the second uplink transmission comprises a PUSCH, a PUCCH, an SRS, or a physical random access channel (PRACH).

176. The base station of any one of claims 139 to 175, wherein the DCI comprises a DCI format 0 1, a DCI format 1 1, or a DCI format 1 0.

177. A non-transitory machine-readable storage medium having stored thereon instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 88.

178. A chip, comprising: a processor, configured to call and ran a computer program stored in a memory, to cause a device in which the chip is installed to execute the method of any one of claims 1 to 88.

179. A computer readable storage medium, in which a computer program is stored, wherein the computer program causes a computer to execute the method of any one of claims 1 to 88.

180. A computer program product, comprising a computer program, wherein the computer program causes a computer to execute the method of any one of claims 1 to 88.

181. A computer program, wherein the computer program causes a computer to execute the method of any one of claims 1 to 88.