WO2021185152A1

WO2021185152A1 - Apparatus and method of wireless communication

Info

Publication number: WO2021185152A1
Application number: PCT/CN2021/080293
Authority: WO
Inventors: Li Guo
Original assignee: Guangdong Oppo Mobile Telecommunications Corp., Ltd.
Priority date: 2020-03-20
Filing date: 2021-03-11
Publication date: 2021-09-23

Abstract

An apparatus and a method of wireless communication are provided. The method by a user equipment (UE) includes being configured with one or more sounding reference signal (SRS) resource sets and being configured with a list of aperiodic SRS trigger states, wherein each aperiodic SRS trigger state is associated with the one or more SRS resource sets. This can solve issues in the prior art, improve flexibility of transmission of SRS resource, improve latency, improve 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

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

Fifth-generation (5G) wireless systems are generally a multi-beam based system in frequency range 2 (FR2) , where multiplex transmission (Tx) and receive (Rx) analog beams are employed by a base station (BS) and/or a user equipment (UE) to combat a large path loss in high frequency band. For example, FR2 can be defined as all carriers with center frequency greater than 28 GHz. In high frequency band systems, for example mmWave systems, the BS and the UE are deployed with large number of antennas, so that large gain beamforming can be used to defeat the large path loss and signal blockage. Due to the hardware limitation and cost, the BS and the UE might be equipped with limited number of transmission and reception units (TXRUs) . Therefore, hybrid beamforming mechanisms can be utilized in both BS and UE. To get the best link quality between the BS and the UE, the BS and the UE need to align the analog beam directions for particular downlink or uplink transmission. For downlink transmission, the BS and the UE need find the best pair of BS Tx beam and UE Rx beam while for uplink transmission, the BS and the UE need to find the best pair of UE Tx beam and BS Rx beam.

Issue with current aperiodic sounding reference signal (SRS) is parameters for an aperiodic SRS resource is determined semi-statically and thus the consequence the flexibility of transmission of aperiodic SRS is limited. For instance, a triggering slot offset for an aperiodic SRS resource set is configured semi-statically in radio resource control (RRC) . Thus, to support enough number of slot offsets to support flexible scheduling, a system would have to configure enough number of SRS resource sets. But in contrast, the number of SRS resource set with usage of codebook-based or non-codebook-based physical uplink shared channel (PUSCH) transmission can only be one. The consequence is the flexibility of transmission of SRS resource is highly limited. The consequence is large latency and large signaling overhead for updating the parameter of aperiodic SRS.

Therefore, there is a need for 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, improve flexibility of transmission of SRS resource, improve latency, improve signaling overhead, provide a good communication performance, and/or provide high reliability.

SUMMARY

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, improve flexibility of transmission of SRS resource, improve latency, improve signaling overhead, provide a good communication performance, and/or provide high reliability.

In a first aspect of the present disclosure, a method of wireless communication by a user equipment (UE) comprises being configured with one or more sounding reference signal (SRS) resource sets and being configured with a list of aperiodic SRS trigger states, wherein each aperiodic SRS trigger state is associated with the one or more SRS resource sets.

In a second aspect of the present disclosure, a method of wireless communication by a base station comprises configuring, to a user equipment (UE) , one or more sounding reference signal (SRS) resource sets and configuring, to the UE, a list of aperiodic SRS trigger states, wherein each aperiodic SRS trigger state is associated with the one or more SRS resource sets.

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 to be configured with one or more sounding reference signal (SRS) resource sets. The processor is configured to be configured with a list of aperiodic SRS trigger states, wherein each aperiodic SRS trigger state is associated with the one or more SRS resource sets.

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) , one or more sounding reference signal (SRS) resource sets. The processor is configured to configure, to the UE, a list of aperiodic SRS trigger states, wherein each aperiodic SRS trigger state is associated with the one or more SRS resource sets.

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.

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.

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.

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.

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

BRIEF DESCRIPTION OF DRAWINGS

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.

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

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

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

FIG. 4 is a block diagram of a system for wireless communication according to an embodiment of the present disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

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.

New radio (NR) specification supports transmission of sounding reference signal (SRS) for uplink channel state information (CSI) acquisition, downlink CSI acquisition based on channel reciprocity, and uplink beam management. A next generation NodeB (gNB) can configure one or more SRS resource sets and in each SRS resource set, a UE can be configured with one or more SRS resources. Each SRS resource contains one, two, or four antenna ports. The SRS resources are applied to different usage including CSI acquisition, beam management and antenna switching, which is configured through a higher layer parameter usage for each SRS resource set. The SRS resource set applicability is configured by the higher layer parameter usage in SRS-ResourceSet. If one SRS resource set is configured with usage which value is set to be ‘beamManagement’ , the SRS resources contained in that set is used for beam management.

The SRS transmission can be configured with one of the three time domain behaviors: periodic, semi-persistent, or aperiodic through a higher layer parameter resourceType. For SRS resource configured with higher layer parameter resourceType = ‘periodic’ , the SRS resource is transmitted periodically in the slots determined according to the higher layer parameter slot level periodicity and slot level offset. For a periodic SRS resource, a UE can be configured with a higher layer parameter spatialRelationInfo containing the ID of a reference RS that can be an SRS, a CSI-RS, or a SS/physical broadcast channel (PBCH) block. For an SRS resource configured with higher layer parameter resourceType = ‘semi-persistent’ , the UE can receive a MAC CE activation or deactivation command to activate or deactivate the transmission of SRS resource. When the UE receives an MAC CE activation command and when the HARQ-ACK corresponding to the PDSCH carrying the activation command is transmitted in slot n, the corresponding action and the UE assumptions on SRS transmission corresponding to the SRS resource set may be applied starting from the first slot that is after

The MAC CE activation command can also contains spatial relation assumptions to the SRS resources in the activated SRS resource set. For a semi-persistent SRS resource, the UE can be configured with spatialRelationInfo in RRC parameter. For a semi-persistent SRS resource, a MAC CE command can be used to update the spatialRelationInfo.

If an SRS resource is configured with higher layer parameter resourceType = ’aperiodic’ , the transmission of the SRS resource is trigged by a DCI and if the UE receives the DCI triggering aperiodic SRS in slot n, the UE transmits aperiodic SRS in each of triggered SRS resource sets in slot

where k is configured via higher layer parameter slot offset for each triggered SRS resource set and is based on the subcarrier spacing of the triggered SRS transmission. For an aperiodic SRS resource, the UE can be provided with a spatial relation info through the higher layer parameter spatialRelationInfo containing one ID of SRS, CSI-RS or SS/PBCH block. The UE can also receive a MAC CE spatial relation update command for an aperiodic SRS. When the HARQ-ACK corresponding to the PDSCH carrying the MAC CE update command is received at slot n, the corresponding actions and the UE assumptions on updating spatial relation info for the SRS resource may be applied for SRS transmission starting from the first slot that is after slot

For a semi-persistent or aperiodic SRS resource, the gNB can use one MAC CE command to update the spatial relation info of all SRS resource with the same SRS resource ID in all the UL BWPs of any component carrier (CC) in a list of CCs.

The issue with current aperiodic SRS is the parameters for an aperiodic SRS resource is determined semi-statically and thus the consequence the flexibility of transmission of aperiodic SRS is limited. For instance, the triggering slot offset for an aperiodic SRS resource set is configured semi-statically in RRC. Thus, to support enough number of slot offsets to support flexible scheduling, the system would have to configure enough number of SRS resource set. But in contrast, the number of SRS resource set with usage of codebook-based or non-codebook-based PUSCH transmission can only be one. The consequence is the flexibility of transmission of SRS resource is highly limited. The spatial relation info is configured to each SRS resource in RRC and the gNB can use MAC CE to update the spatial relation info. The power control parameter is configured to one SRS resource set in RRC and the gNB can use MAC CE to update the pathloss RS for one SRS resource set. The consequence is large latency and large signaling overhead for updating the parameter of aperiodic SRS.

Some embodiments of the present disclosure provide methods and apparatuses for solving one or more of the above issues.

FIG. 1 illustrates that, in some embodiments, one or more user equipments (UEs) 10 and a base station (e.g., gNB or eNB) 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.

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.

In some embodiments, the processor 11 is configured to be configured with one or more sounding reference signal (SRS) resource sets. The processor 11 is configured to be configured with a list of aperiodic SRS trigger states, wherein each aperiodic SRS trigger state is associated with the one or more SRS resource sets. This can solve issues in the prior art, improve flexibility of transmission of SRS resource, improve latency, improve signaling overhead, provide a good communication performance, and/or provide high reliability.

In some embodiments, the processor 21 is configured to configure, to the user equipment (UE) 10, one or more sounding reference signal (SRS) resource sets. The processor 21 is configured to configure, to the UE 10, a list of aperiodic SRS trigger states, wherein each aperiodic SRS trigger state is associated with the one or more SRS resource sets. This can solve issues in the prior art, improve flexibility of transmission of SRS resource, improve latency, improve signaling overhead, provide a good communication performance, and/or provide high reliability.

FIG. 2 illustrates a method 200 of wireless communication by a user equipment (UE) 10 according to an embodiment of the present disclosure. In some embodiments, the method 200 includes: a block 202, being configured with one or more sounding reference signal (SRS) resource sets, and a block 204, being configured with a list of aperiodic SRS trigger states, wherein each aperiodic SRS trigger state is associated with the one or more SRS resource sets. This can solve issues in the prior art, improve flexibility of transmission of SRS resource, improve latency, improve signaling overhead, provide a good communication performance, and/or provide high reliability.

FIG. 3 illustrates a method 300 of wireless communication by a base station 20 according to an embodiment of the present disclosure. In some embodiments, the method 300 includes: a block 302, configuring, to a user equipment (UE) , one or more sounding reference signal (SRS) resource sets, and a block 304, configuring, to the UE, a list of aperiodic SRS trigger states, wherein each aperiodic SRS trigger state is associated with the one or more SRS resource sets. This can solve issues in the prior art, improve flexibility of transmission of SRS resource, improve latency, improve signaling overhead, provide a good communication performance, and/or provide high reliability.

In some embodiments, for each SRS resource set, the UE is configured with one or more SRS resources. In some embodiments, one aperiodic SRS trigger state is initiated with a downlink control information (DCI) field in a DCI format. In some embodiments, the DCI format comprises a DCI format 0_1, a DCI format 0_2, a DCI format 1_1, a DCI format 1_2, or a DCI format 2_3. In some embodiments, the DCI field comprises an SRS request bit-field. In some embodiments, a size of the DCI field is fixed to one value. In some embodiments, a size of the DCI field is predefined or pre-specified. In some embodiments, a size of the DCI field is configured by a radio resource control (RRC) parameter. In some embodiments, the DCI field in the DCI format triggers one SRS resource set associated with a value configured in SRS resource set.

In some embodiments, all bits in the DCI field are set to zero, no aperiodic SRS is triggered. In some embodiments, when a number of configured aperiodic SRS trigger states is greater than 2 ^N-1, where N is a number of bits in the DCI field, the UE receives a subselection command that is used to map up to 2 ^N-1 aperiodic SRS trigger states to codepoints of the DCI field. In some embodiments, when the UE transmits a physical uplink control channel (PUCCH) with a hybrid automatic repeat request-acknowledge (HARQ-ACK) information in a slot n corresponding a physical downlink shared channel (PDSCH) carrying the subselection command, the UE performs on a mapping of aperiodic SRS trigger states to the codepoints of the DCI field. In some embodiments, the mapping is applied starting from a first slot that is after slot

where μ is a subcarrier spacing (SCS) configuration for the PUCCH. In some embodiments, when a number of aperiodic SRS trigger states is less than or equal to 2 ^N-1, N is a number of bits in the DCI field, the DCI field indicates the aperiodic SRS trigger state directly.

In some embodiments, the one or more SRS resource sets are configured by at least one of higher layer parameters. In some embodiments, the at least one of the higher layer parameters comprises: an SRS resource set identifier (ID) ; a slot offset for a triggered SRS resource set; a slot offset for each SRS resource in the triggered SRS resource set; a spatial relation information configured to each SRS resource in the triggered SRS resource set; a transmission configuration indicator (TCI) -state configured to each SRS resource in the triggered SRS resource set; a usage parameter for the triggered SRS resource set; a power control parameter for the triggered SRS resource set; an associated channel state information reference signal (CSI-RS) resource; a panel ID used to indicate a UE transmission (Tx) panel used to transmit the trigged SRS resource set; and a parameter used to indicate a mode of Tx beam sweeping on SRS resources in the triggered SRS resource set.

In some embodiments, the power control parameter comprises a target received power p0, a compensation factor alpha, a pathloss reference signal (RS) , and/or an SRS power control adjustment state. In some embodiments, a total number of different pathloss RSs configured in the aperiodic SRS trigger states is limited by a value N, where N is an integer. In some embodiments, N is predefined or pre-specified or based on UE capability. In some embodiments, the at least one of the high layer parameters is updated for one aperiodic SRS trigger state through a medium access control (MAC) control element (CE) .

In some embodiments, a UE can be configured with one or more SRS resource sets as configured by a higher layer parameter SRS-ResourceSet. For each SRS resource set, the UE can be configured with K≥1 SRS resources. The UE can be configured with a list of aperiodic SRS trigger states. One aperiodic SRS trigger state can be associated with one or more SRS resource sets. For one SRS resource set associated with one aperiodic SRS trigger state, the UE can be provided with one or more of the following parameters for SRS transmission when the SRS resource set is triggered:

One or more of the following parameters include: a set ID for the SRS resource set; a slot offset for the SRS resource set that is used to determine the slot location for the SRS resource transmission when the SRS resource set is triggered; a list of slot offset values and each of the slot offset is configured to one SRS resource configured in the SRS resource set; a list of spatial relation information (that is a downlink (DL) RS or uplink (UL) SRS) and each of the spatial relation info is configured to one SRS resource configured in the SRS resource set; a list of TCI-states and each of the TCI-state is configured to each SRS resource configured in the SRS resource set; a power control parameter for the SRS resource set: the power control parameter can be p0, alpha, pathloss RS and/or SRS power control adjustment state; a parameter used to indicate the applicability of the SRS resource set; an associated CSI-RS resource that is used by the UE to measure downlink CSI and then estimate precoder for SRS transmission; a UE panel ID that to indicate which Tx panel the UE may use to transmit the triggered SRS resource set; an Tx beam sweeping mode parameter that indicates the Tx beam sweeping mode the UE may apply to the SRS resources in the triggered SRS resource set; and/or a spatial relation info or TCI-state that is used by the UE to generate uplink Tx beams for SRS resources in the triggered SRS resource set.

In some embodiments, an aperiodic SRS resource trigger state can be initiated with a DCI field in a DCI format. When a first aperiodic SRS resource trigger state is indicated by the DCI field in a DCI format, for example DCI format 0_1, the UE may transmit aperiodic SRS in each SRS resource set associated with the indicated aperiodic SRS trigger state in the slot and other transmission configurations according the parameter configured in higher layer.

In a first exemplary method, a UE can be configured with one or more SRS resource sets as configured by the higher layer parameter SRS-ResourceSet. For each SRS resource set, the UE can be configured with K≥1 SRS resources. For aperiodic SRS resource triggering, the UE can be a set of aperiodic SRS trigger states, for example, through higher layer parameter AperiodicSRS-TriggerStateList. Each aperiodic SRS trigger state can be associated with one or more SRS resource sets. For each SRS resource set associated with each aperiodic SRS trigger state, the UE is indicated with one slot offset value that is used to determine a slot location for transmission of the triggered SRS resource set. For each aperiodic SRS resource in an SRS resource set associated with each aperiodic SRS trigger state, the UE is indicated with the configuration of spatial relation between a reference RS and a target SRS resource, for which in one example, a higher layer parameter spatialRelationInfo can be configured, containing a list of SRS-SpatialRelationInfo containing a reference RS that may be an SS/PBCH block, CSI-RS, or SRS resource. The spatial relation configuration can be configured through a UL TCI state. An example of higher layer parameter of AperiodicSRS-TriggerStateList that configures a list of aperiodic SRS trigger states and AperiodicSRS-TriggerState that configures one aperiodic SRS trigger state is given in the following table:

A trigger state is initiated using a DCI field in a DCI format, for instance DCI format 0_1, 0_2, 1_1, 1_2, and 2_3. When the UE receives a downlink DCI, a group common DCI, or an uplink DCI where a codepoint of the DCI indicates one aperiodic SRS trigger state, the UE may transmit the SRS resource in the SRS resource set (s) associated with the indicated aperiodic SRS trigger state and the UE may transmit the SRS resource according to the higher layer parameters configured in the triggered aperiodic SRS trigger state for the associated SRS resource set.

In a second exemplary method, a UE can be configured with one or more SRS resource sets as configured by the higher layer parameter SRS-ResourceSet. For each SRS resource set, the UE can be configured with K≥1 SRS resources. For aperiodic SRS resource triggering, the UE can be a set of aperiodic SRS trigger states, for example, through higher layer parameter AperiodicSRS-TriggerStateList. Each aperiodic SRS trigger state can be associated with one or more SRS resource sets. For each SRS resource set associated with each aperiodic SRS trigger state, the UE is indicated with one slot offset value that is used to determine the slot location for the transmission of the triggered SRS resource set. For each SRS resource set associated each aperiodic SRS trigger state, the UE is configured with uplink power parameters: p0, alpha, path loss reference signal, and/or SRS power control adjustment state. An example of higher layer parameter of AperiodicSRS-TriggerStateList that configures a list of aperiodic SRS trigger states and AperiodicSRS-TriggerState that configures one aperiodic SRS trigger state is given in the following table:

In one example, the number of different path loss reference signals configured in AperiodicSRS-TriggerStateList may be no more than N, where N may be an integer.

A trigger state is initiated using a DCI field in a DCI format, for instance DCI format 0_1, 0_2, 1_1, 1_2, and 2_3. When the UE receives a downlink DCI, a group common DCI, or an uplink DCI where a codepoint of the DCI indicates one aperiodic SRS trigger state, the UE may transmit the SRS resource in the SRS resource set (s) associated with the indicated aperiodic SRS trigger state and the UE may transmit the SRS resource according to the higher layer parameters configured in the triggered aperiodic SRS trigger state for the associated SRS resource set. To determine the uplink transmit power on the SRS resource transmission in the triggered SRS resource set, the UE may use the higher layer parameter alpha and p0 configured in the indicated trigger state and the UE may use the pathlossReferenceRS configured in the indicated trigger state to estimate path loss.

In a third exemplary method, a UE can be configured with one or more SRS resource sets as configured by the higher layer parameter SRS-ResourceSet. For each SRS resource set, the UE can be configured with K≥1 SRS resources. For aperiodic SRS resource triggering, the UE can be a set of aperiodic SRS trigger states, for example, through higher layer parameter AperiodicSRS-TriggerStateList. Each aperiodic SRS trigger state can be associated with one or more SRS resource sets. For each aperiodic SRS resource in an SRS resource set associated with each aperiodic SRS trigger state, the UE is indicated with a slot offset value for the transmission of one SRS resource. An example of higher layer parameter of AperiodicSRS-TriggerStateList that configures a list of aperiodic SRS trigger states and AperiodicSRS-TriggerState that configures one aperiodic SRS trigger state is given in the following table:

In the example, in one trigger state, for an associated SRS resource set, the UE is configured with a higher layer parameter slotOffsetList which contains a list of slot offset values for the SRS resources contained in the associated SRS resource set. A trigger state is initiated using a DCI field in a DCI format, for instance DCI format 0_1, 0_2, 1_1, 1_2, and 2_3. When the UE receives a downlink DCI, a group common DCI, or an uplink DCI where a codepoint of the DCI indicates one aperiodic SRS trigger state, the UE may transmit the SRS resource in the SRS resource set (s) associated with the indicated aperiodic SRS trigger state and the UE may transmit the SRS resource according to the higher layer parameters configured in the triggered aperiodic SRS trigger state for the associated SRS resource set. The slot offset value for the m-th SRS resource is the m-th entry in the slotOffsetList. If the UE receives the DCI indicating aperiodic SRS trigger state in slot n, the UE transmits m-th SRS resource in an associated SRS resource set in slot

where k is equal to the value of m-th entry in higher layer parameter slotOffsetList configured for the associated SRS resource set in the aperiodic SRS trigger state and is based on the subcarrier spacing of the triggered SRS transmission, μ _SRS and μ _PDCCH are the subcarrier spacing configurations for triggered SRS and physical downlink control channel (PDCCH) carrying the triggering command respectively;

and the μ _offset for the {scheduling, scheduled} carrier pair is defined in TS 38.211.

In a fourth exemplary method, a UE can be configured with one or more SRS resource sets as configured by the higher layer parameter SRS-ResourceSet. For each SRS resource set, the UE can be configured with K≥1 SRS resources. For aperiodic SRS resource triggering, the UE can be a set of aperiodic SRS trigger states, for example, through higher layer parameter AperiodicSRS-TriggerStateList. Each aperiodic SRS trigger state can be associated with one or more SRS resource sets. For each SRS resource set associated with each aperiodic SRS trigger state, the UE is indicated with one slot offset value that is used to determine the slot location for the transmission of the triggered SRS resource set. For each SRS resource set associated with each aperiodic SRS trigger state, the UE is indicated with the applicability of triggered SRS resource set through a higher layer parameter usage. An example of higher layer parameter of AperiodicSRS-TriggerStateList that configures a list of aperiodic SRS trigger states and AperiodicSRS-TriggerState that configures one aperiodic SRS trigger state is given in the following table:

A trigger state is initiated using a DCI field in a DCI format, for instance DCI format 0_1, 0_2, 1_1, 1_2, and 2_3. When the UE receives a downlink DCI, a group common DCI, or an uplink DCI where a codepoint of the DCI indicates one aperiodic SRS trigger state, the UE may transmit the SRS resource in the SRS resource set (s) associated with the indicated aperiodic SRS trigger state and the UE may transmit the SRS resource according to the higher layer parameters configured in the triggered aperiodic SRS trigger state for the associated SRS resource set. For the applicability of one SRS resource set, the UE may assume the applicability may follow the usage configured in the most recent aperiodic SRS trigger state indicated by a DCI.

In a fifth exemplary method, a UE can be configured with one or more SRS resource sets as configured by the higher layer parameter SRS-ResourceSet. For each SRS resource set, the UE can be configured with K≥1 SRS resources. For aperiodic SRS resource triggering, the UE can be a set of aperiodic SRS trigger states, for example, through higher layer parameter AperiodicSRS-TriggerStateList. Each aperiodic SRS trigger state can be associated with one or more SRS resource sets. For each SRS resource set associated with each aperiodic SRS trigger state, the UE is indicated with one slot offset value that is used to determine the slot location for the transmission of the triggered SRS resource set. For an SRS resource set associated with each aperiodic SRS trigger state, the UE can be provided with a non-zero-power channel state information reference signal (NZP CSI-RS) resource for measurement via a higher layer parameter associatedCSI-RS in the configured trigger state. An example of higher layer parameter of AperiodicSRS-TriggerStateList that configures a list of aperiodic SRS trigger states and AperiodicSRS-TriggerState that configures one aperiodic SRS trigger state is given in the following table:

A trigger state is initiated using a DCI field in a DCI format, for instance DCI format 0_1, 0_2, 1_1, 1_2, and 2_3. When the UE receives a downlink DCI, a group common DCI, or an uplink DCI where a codepoint of the DCI indicates one aperiodic SRS trigger state, the UE may transmit the SRS resource in the SRS resource set (s) associated with the indicated aperiodic SRS trigger state and the UE may transmit the SRS resource according to the higher layer parameters configured in the triggered aperiodic SRS trigger state for the associated SRS resource set. For an SRS resource set associated with the indicated trigger state, the UE may use the NZP CSI-RS configured through associatedCSI-RS provided in the trigger state for measurement.

In a sixth exemplary method, a UE can be configured with one or more SRS resource sets as configured by the higher layer parameter SRS-ResourceSet. For each SRS resource set, the UE can be configured with K≥1 SRS resources. For aperiodic SRS resource triggering, the UE can be a set of aperiodic SRS trigger states, for example, through higher layer parameter AperiodicSRS-TriggerStateList. Each aperiodic SRS trigger state can be associated with one or more SRS resource sets. For each SRS resource set associated with each aperiodic SRS trigger state, the UE is indicated with one slot offset value that is used to determine the slot location for the transmission of the triggered SRS resource set. For an SRS resource set associated with each aperiodic SRS trigger state, the UE can be provided with UE panel ID to indicate an uplink Tx panel where the UE may transmit the SRS resource in the associated SRS resource set. An example of higher layer parameter of AperiodicSRS-TriggerStateList that configures a list of aperiodic SRS trigger states and AperiodicSRS-TriggerState that configures one aperiodic SRS trigger state is given in the following table:

A trigger state is initiated using a DCI field in a DCI format, for instance DCI format 0_1, 0_2, 1_1, 1_2, and 2_3. When the UE receives a downlink DCI, a group common DCI, or an uplink DCI where a codepoint of the DCI indicates one aperiodic SRS trigger state, the UE may transmit the SRS resource in the SRS resource set (s) associated with the indicated aperiodic SRS trigger state and the UE may transmit the SRS resource according to the higher layer parameters configured in the triggered aperiodic SRS trigger state for the associated SRS resource set. For an SRS resource set associated with the indicated trigger state, the UE may transmit SRS resource with the UE Tx panel identified by value of uePanelID.

In a seventh exemplary method, a UE can be configured with one or more SRS resource sets as configured by the higher layer parameter SRS-ResourceSet. For each SRS resource set, the UE can be configured with K≥1 SRS resources. For aperiodic SRS resource triggering, the UE can be a set of aperiodic SRS trigger states, for example, through higher layer parameter AperiodicSRS-TriggerStateList. Each aperiodic SRS trigger state can be associated with one or more SRS resource sets. For each SRS resource set associated with each aperiodic SRS trigger state, the UE is indicated with one slot offset value that is used to determine the slot location for the transmission of the triggered SRS resource set. For an SRS resource set associated with each aperiodic SRS trigger state, the UE can be provided with: a higher layer parameter to indicate the Tx beam sweeping mode or a higher layer parameter to provide a spatial relation configuration for the SRS resources contain in the SRS resource set.

A higher layer parameter to indicate the Tx beam sweeping mode: In on example, a higher layer parameter repetition is configured with value on or off. When the higher layer parameter repetition is set to on, the UE may apply same spatial domain transmit filter on all the SRS resources configured in an SRS resource set. When the higher layer parameter repetition is set to on, the UE may apply different spatial domain transmit filter on all the SRS resources configured in an SRS resource set.

A higher layer parameter to provide a spatial relation configuration for the SRS resources contain in the SRS resource set: The UE may use this spatial relation configuration to derive the spatial domain transmit filter (s) to be applied on the SRS resources configured in an SRS resource set.

An example of higher layer parameter of AperiodicSRS-TriggerStateList that configures a list of aperiodic SRS trigger states and AperiodicSRS-TriggerState that configures one aperiodic SRS trigger state is given in the following table:

Another example of higher layer parameter of AperiodicSRS-TriggerStateList that configures a list of aperiodic SRS trigger states and AperiodicSRS-TriggerState that configures one aperiodic SRS trigger state is given in the following table:

A trigger state is initiated using a DCI field in a DCI format, for instance DCI format 0_1, 0_2, 1_1, 1_2, and 2_3. When the UE receives a downlink DCI, a group common DCI or an uplink DCI where a codepoint of the DCI indicates one aperiodic SRS trigger state, the UE may transmit the SRS resource in the SRS resource set (s) associated with the indicated aperiodic SRS trigger state and the UE may transmit the SRS resource according to the higher layer parameters configured in the triggered aperiodic SRS trigger state for the associated SRS resource set. For an SRS resource set associated with the indicated trigger state, the UE may transmit SRS resources according to the higher layer parameter repetition and spatialRelationInfo associated with the indicated trigger state. When the value of repetition is on, the UE may use one same spatial domain transmit filter to transmit all the SRS resources configured in the SRS resource set associated with the indicated aperiodic SRS trigger state and the spatial domain transmit filter is same to the spatial domain transmit filter used to transmit SRS configured in the spatialRelationInfo or the spatial domain receive filter used to receive the CSI-RS or SS/PBCH block configured in spatialRelationInfo. When the value of repetition is off, the UE may apply different spatial domain transmit filters to transmit all the SRS resources configured in the SRS resource set associated with the indicated aperiodic SRS trigger state and any of those spatial domain transmit filters are generated based on the spatial domain transmit filter used to transmit SRS configured in the spatialRelationInfo or the spatial domain receive filter used to receive the CSI-RS or SS/PBCH block configured in spatialRelationInfo.

In an eighth exemplary method, a UE can be configured with one or more SRS resource sets as configured by the higher layer parameter SRS-ResourceSet. For each SRS resource set, the UE can be configured with K≥1 SRS resources. For aperiodic SRS resource triggering, the UE can be a set of aperiodic SRS trigger states, for example, through higher layer parameter AperiodicSRS-TriggerStateList. Each aperiodic SRS trigger state can be associated with one or more SRS resource sets. For each SRS resource set associated with each aperiodic SRS trigger state, the UE can be provided with one or more higher layer parameters providing transmission configuration. A first DCI field in a DCI format can be used to indicate one aperiodic SRS trigger state. The size of the first DCI field can be fixed to one value, which can be predefined or pre-specified. The size of the first DCI field can be configured by an RRC parameter.

When all the bits in the first DCI field are set to zero, no aperiodic SRS is triggered. When the number of configured aperiodic SRS trigger states in AperiodicSRS-TriggerStateList is greater than 2 ^N-1, where N is the number of bits in the first DCI field, the UE receives a subselection command that is used to map up to 2 ^N-1 aperiodic SRS trigger states in the to the codepoints of the first DCI field. When the UE would transmit a PUCCH with a HARQ-ACK information in the slot n corresponding the PDSCH carrying the subselection command, the UE assumptions on the mapping of aperiodic SRS trigger states to the codepoints of the first DCI field may be applied starting from the first slot that is after slot

where μ is the SCS configuration for the PUCCH. When the number of aperiodic SRS trigger states configured in AperiodicSRS-TriggerStateList is less than or equal to 2 ^N-1, the first DCI field indicates the aperiodic SRS trigger state directly.

In a ninth exemplary method, a UE can be configured with one or more SRS resource sets as configured by the higher layer parameter SRS-ResourceSet. For each SRS resource set, the UE can be configured with K≥1 SRS resources. For aperiodic SRS resource triggering, the UE can be a set of aperiodic SRS trigger states, for example, through higher layer parameter AperiodicSRS-TriggerStateList. Each aperiodic SRS trigger state can be associated with one or more SRS resource sets. For each SRS resource set associated with each aperiodic SRS trigger state, the UE can be provided with one or more higher layer parameters providing transmission configuration. In an example, the SRS request field in DCI format 0_1, 1_1, and 2_3 can indicate one aperiodic SRS trigger state in the AperiodicSRS-TriggerStateList.

When all the bits of SRS request field in the DCI are set to zero, no aperiodic SRS trigger state in the AperiodicSRS-TriggerStateList is indicated. When the number of configured aperiodic SRS trigger states in AperiodicSRS-TriggerStateList is greater than 2 ^N-1, where N is the number of bits in the SRS request field (an example of N is 2, 3, 4, ) , the UE receives a subselection command that is used to map up to 2 ^N-1 aperiodic SRS trigger states in the to the codepoints of the SRS request field. When the UE would transmit a PUCCH with a HARQ-ACK information in the slot n corresponding the PDSCH carrying the subselection command, the UE assumptions on the mapping of aperiodic SRS trigger states to the codepoints of the SRS request field may be applied starting from the first slot that is after slot

where μ is the SCS configuration for the PUCCH. When the number of aperiodic SRS trigger states configured in AperiodicSRS-TriggerStateList is less than or equal to 2 ^N-1, the SRS request field indicates the aperiodic SRS trigger state directly.

In summary, some embodiments of the present disclosure provide the following methods for aperiodic SRS transmission are presented: 1. A UE is configured with a list of aperiodic SRS trigger state and each aperiodic SRS trigger state can be associated with one or more SRS resource sets. A DCI bit-field in a DCI format can indicate one aperiodic SRS trigger state. 2. For one aperiodic SRS trigger state, the UE can be configured with the following parameter for one associated SRS resource set: an SRS resource set ID; a slot offset for the triggered SRS resource set; a slot offset for each SRS resource in the triggered SRS resource set; spatial relation information configured to each SRS resource in the triggered SRS resource set; a TCI-state configured to each SRS resource in the triggered SRS resource set; a usage parameter for the triggered SRS resource set; a power control parameter for the triggered SRS resource set: p0, alpha, and a pathloss reference signal, an SRS power control adjustment state; an associated CSI-RS resource; a panel ID that is used to indicate which UE Tx panel may be used to transmit the trigged SRS resource set; and/or a parameter to indicate the mode of Tx beam sweeping on the SRS resources in the triggered SRS resource set. For example, one value of that parameter can indicate the UE to apply Tx beam sweeping across the SRS resources in the triggered SRS resource set. For example, one value of that parameter can indicate to the UE to apply same Tx beam on the SRS resources in the triggered SRS resource. 3. The system can use MAC CE to update the configuration parameters for one aperiodic SRS trigger state. 4. The total number of different pathloss reference signal configured in all the aperiodic SRS trigger states may be limited by a value N, which can be a value pre-specified or based on UE capability. 5. The size of SRS request bit-field can be configured in RRC. The SRS request bit-field in DCI can indicate on aperiodic SRS trigger state and also triggers one SRS resource set associated with that value configured in SRS resource set.

The following 3rd Generation Partnership Project (3GPP) standards are incorporated in this disclosure by reference in their entireties: 3GPP TS 38.211 V15.5.0: "NR; Physical channels and modulation" ; 3GPP TS 38.212 V15.5.0: "NR; Multiplexing and channel coding" ; 3GPP TS 38.213 V15.5.0: "NR; Physical layer procedures for control" ; 3GPP TS 38.214 V15.5.0: "NR; Physical layer procedures for data" ; 3GPP TS 38.215 V15.5.0: "NR; Physical layer measurements" ; 3GPP TS 38.321 V15.5.0: "NR; Medium Access Control (MAC) protocol specification" ; and 3GPP TS 38.331 V15.5.0: "NR; Radio Resource Control (RRC) protocol specification" .

Commercial interests for some embodiments are as follows. 1. Solving issues in the prior art. 2. Improving flexibility of transmission of SRS resource. 3. Improving latency. 4. Improving signaling overhead. 5. Providing a good communication performance. 6. Providing high reliability. 7. 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. The deployment scenarios include, but not limited to, indoor hotspot, dense urban, urban micro, urban macro, rural, factor hall, and indoor D2D scenarios. Some embodiments of the present disclosure are a combination of “techniques/processes” that can be adopted in 3GPP specification to create an end product. Some embodiments of the present disclosure could be adopted in 5G NR licensed and non-licensed or shared spectrum communications. Some embodiments of the present disclosure propose technical mechanisms. The present example embodiment is applicable to NR in unlicensed spectrum (NR-U) . The present disclosure can be applied to other mobile networks, in particular to mobile network of any further generation cellular network technology (6G, etc. ) .

FIG. 4 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. 4 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.

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 (WLAN) , 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.

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.

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 circuitry. 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.

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.

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.

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.

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.

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.

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.

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

A wireless communication method by a user equipment (UE) , comprising:

being configured with one or more sounding reference signal (SRS) resource sets; and

being configured with a list of aperiodic SRS trigger states, wherein each aperiodic SRS trigger state is associated with the one or more SRS resource sets.
The method of claim 1, wherein for each SRS resource set, the UE is configured with one or more SRS resources.
The method of claim 1, wherein one aperiodic SRS trigger state is initiated with a downlink control information (DCI) field in a DCI format.
The method of claim 3, wherein the DCI format comprises a DCI format 0_1, a DCI format 0_2, a DCI format 1_1, a DCI format 1_2, or a DCI format 2_3.
The method of claim 3, wherein the DCI field comprises an SRS request bit-field.
The method of claim 3, wherein a size of the DCI field is fixed to one value.
The method of claim 3, wherein a size of the DCI field is predefined or pre-specified.
The method of claim 3, wherein a size of the DCI field is configured by a radio resource control (RRC) parameter.
The method of claim 3, wherein the DCI field in the DCI format triggers one SRS resource set associated with a value configured in SRS resource set.
The method of claim 3, wherein all bits in the DCI field are set to zero, no aperiodic SRS is triggered.
The method of claim 3, wherein when a number of configured aperiodic SRS trigger states is greater than 2 ^N-1, where N is a number of bits in the DCI field, the UE receives a subselection command that is used to map up to 2 ^N-1 aperiodic SRS trigger states to codepoints of the DCI field.
The method of claim 11, wherein when the UE transmits a physical uplink control channel (PUCCH) with a hybrid automatic repeat request-acknowledge (HARQ-ACK) information in a slot n corresponding a physical downlink shared channel (PDSCH) carrying the subselection command, the UE performs on a mapping of aperiodic SRS trigger states to the codepoints of the DCI field.
The method of claim 12, wherein the mapping is applied starting from a first slot that is after slot
where μ is a subcarrier spacing (SCS) configuration for the PUCCH.
The method of claim 3, wherein when a number of aperiodic SRS trigger states is less than or equal to 2 ^N-1, N is a number of bits in the DCI field, the DCI field indicates the aperiodic SRS trigger state directly.
The method of claim 1, wherein the one or more SRS resource sets are configured by at least one of higher layer parameters.
The method of claim 15, wherein the at least one of the higher layer parameters comprises:

an SRS resource set identifier (ID) ;

a slot offset for a triggered SRS resource set;

a slot offset for each SRS resource in the triggered SRS resource set;

a spatial relation information configured to each SRS resource in the triggered SRS resource set;

a transmission configuration indicator (TCI) -state configured to each SRS resource in the triggered SRS resource set;

a usage parameter for the triggered SRS resource set;

a power control parameter for the triggered SRS resource set;

an associated channel state information reference signal (CSI-RS) resource;

a panel ID used to indicate a UE transmission (Tx) panel used to transmit the trigged SRS resource set; and

a parameter used to indicate a mode of Tx beam sweeping on SRS resources in the triggered SRS resource set.
The method of claim 16, wherein the power control parameter comprises a target received power p0, a compensation factor alpha, a pathloss reference signal (RS) , and/or an SRS power control adjustment state.
The method of claim 17, wherein a total number of different pathloss RSs configured in the aperiodic SRS trigger states is limited by a value N, where N is an integer.
The method of claim 18, wherein N is predefined or pre-specified or based on UE capability.
The method of claim 16, wherein the at least one of the high layer parameters is updated for one aperiodic SRS trigger state through a medium access control (MAC) control element (CE) .
A wireless communication method by a base station, comprising:

configuring, to a user equipment (UE) , one or more sounding reference signal (SRS) resource sets; and

configuring, to the UE, a list of aperiodic SRS trigger states, wherein each aperiodic SRS trigger state is associated with the one or more SRS resource sets.
The method of claim 21, wherein for each SRS resource set, the base station is configured to configure, to the UE, one or more SRS resources.
The method of claim 21, wherein one aperiodic SRS trigger state is initiated with a downlink control information (DCI) field in a DCI format.
The method of claim 23, wherein the DCI format comprises a DCI format 0_1, a DCI format 0_2, a DCI format 1_1, a DCI format 1_2, or a DCI format 2_3.
The method of claim 23, wherein the DCI field comprises an SRS request bit-field.
The method of claim 23, wherein a size of the DCI field is fixed to one value.
The method of claim 23, wherein a size of the DCI field is predefined or pre-specified.
The method of claim 23, wherein a size of the DCI field is configured by a radio resource control (RRC) parameter.
The method of claim 23, wherein the DCI field in the DCI format triggers one SRS resource set associated with a value configured in SRS resource set.
The method of claim 23, wherein all bits in the DCI field are set to zero, no aperiodic SRS is triggered.
The method of claim 23, wherein when a number of configured aperiodic SRS trigger states is greater than 2 ^N-1, where N is a number of bits in the DCI field, the base station transmits a subselection command that is used to map up to 2 ^N-1 aperiodic SRS trigger states to codepoints of the DCI field.
The method of claim 31, wherein when the base station receives a physical uplink control channel (PUCCH) with a hybrid automatic repeat request-acknowledge (HARQ-ACK) information in a slot n corresponding a physical downlink shared channel (PDSCH) carrying the subselection command, a mapping of aperiodic SRS trigger states to the codepoints of the DCI field is made.
The method of claim 32, wherein the mapping is applied starting from a first slot that is after slot
where μ is a subcarrier spacing (SCS) configuration for the PUCCH.
The method of claim 23, wherein when a number of aperiodic SRS trigger states is less than or equal to 2 ^N-1, N is a number of bits in the DCI field, the DCI field indicates the aperiodic SRS trigger state directly.
The method of claim 21, wherein the one or more SRS resource sets are configured by at least one of higher layer parameters.
The method of claim 35, wherein the at least one of the higher layer parameters comprises:

an SRS resource set identifier (ID) ;

a slot offset for a triggered SRS resource set;

a slot offset for each SRS resource in the triggered SRS resource set;

a spatial relation information configured to each SRS resource in the triggered SRS resource set;

a transmission configuration indicator (TCI) -state configured to each SRS resource in the triggered SRS resource set;

a usage parameter for the triggered SRS resource set;

a power control parameter for the triggered SRS resource set;

an associated channel state information reference signal (CSI-RS) resource;

a panel ID used to indicate a UE transmission (Tx) panel used to transmit the trigged SRS resource set; and

a parameter used to indicate a mode of Tx beam sweeping on SRS resources in the triggered SRS resource set.
The method of claim 36, wherein the power control parameter comprises a target received power p0, a compensation factor alpha, a pathloss reference signal (RS) , and/or an SRS power control adjustment state.
The method of claim 37, wherein a total number of different pathloss RSs configured in the aperiodic SRS trigger states is limited by a value N, where N is an integer.
The method of claim 38, wherein N is predefined or pre-specified or based on UE capability.
The method of claim 36, wherein the at least one of the high layer parameters is updated for one aperiodic SRS trigger state through a medium access control (MAC) control element (CE) .
A user equipment (UE) , comprising:

a memory;

a transceiver; and

a processor coupled to the memory and the transceiver;

wherein the processor is configured to be configured with one or more sounding reference signal (SRS) resource sets; and

wherein the processor is configured to be configured with a list of aperiodic SRS trigger states, wherein each aperiodic SRS trigger state is associated with the one or more SRS resource sets.
The UE of claim 41, wherein for each SRS resource set, the processor is configured with one or more SRS resources.
The UE of claim 41, wherein one aperiodic SRS trigger state is initiated with a downlink control information (DCI) field in a DCI format.
The UE of claim 43, wherein the DCI format comprises a DCI format 0_1, a DCI format 0_2, a DCI format 1_1, a DCI format 1_2, or a DCI format 2_3.
The UE of claim 43, wherein the DCI field comprises an SRS request bit-field.
The UE of claim 43, wherein a size of the DCI field is fixed to one value.
The UE of claim 43, wherein a size of the DCI field is predefined or pre-specified.
The UE of claim 43, wherein a size of the DCI field is configured by a radio resource control (RRC) parameter.
The UE of claim 43, wherein the DCI field in the DCI format triggers one SRS resource set associated with a value configured in SRS resource set.
The UE of claim 43, wherein all bits in the DCI field are set to zero, no aperiodic SRS is triggered.
The UE of claim 43, wherein when a number of configured aperiodic SRS trigger states is greater than 2 ^N-1, where N is a number of bits in the DCI field, the transceiver receives a subselection command that is used to map up to 2 ^N-1 aperiodic SRS trigger states to codepoints of the DCI field.
The UE of claim 51, wherein when the transceiver transmits a physical uplink control channel (PUCCH) with a hybrid automatic repeat request-acknowledge (HARQ-ACK) information in a slot n corresponding a physical downlink shared channel (PDSCH) carrying the subselection command, the processor performs on a mapping of aperiodic SRS trigger states to the codepoints of the DCI field.
The UE of claim 52, wherein the mapping is applied starting from a first slot that is after slot
where μ is a subcarrier spacing (SCS) configuration for the PUCCH.
The UE of claim 43, wherein when a number of aperiodic SRS trigger states is less than or equal to 2 ^N-1, N is a number of bits in the DCI field, the DCI field indicates the aperiodic SRS trigger state directly.
The UE of claim 41, wherein the one or more SRS resource sets are configured by at least one of higher layer parameters.
The UE of claim 55, wherein the at least one of the higher layer parameters comprises:

an SRS resource set identifier (ID) ;

a slot offset for a triggered SRS resource set;

a slot offset for each SRS resource in the triggered SRS resource set;

a spatial relation information configured to each SRS resource in the triggered SRS resource set;

a transmission configuration indicator (TCI) -state configured to each SRS resource in the triggered SRS resource set;

a usage parameter for the triggered SRS resource set;

a power control parameter for the triggered SRS resource set;

an associated channel state information reference signal (CSI-RS) resource;

a panel ID used to indicate a UE transmission (Tx) panel used to transmit the trigged SRS resource set; and

a parameter used to indicate a mode of Tx beam sweeping on SRS resources in the triggered SRS resource set.
The UE of claim 56, wherein the power control parameter comprises a target received power p0, a compensation factor alpha, a pathloss reference signal (RS) , and/or an SRS power control adjustment state.
The UE of claim 57, wherein a total number of different pathloss RSs configured in the aperiodic SRS trigger states is limited by a value N, where N is an integer.
The UE of claim 58, wherein N is predefined or pre-specified or based on UE capability.
The UE of claim 56, wherein the at least one of the high layer parameters is updated for one aperiodic SRS trigger state through a medium access control (MAC) control element (CE) .
A base 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) , one or more sounding reference signal (SRS) resource sets; and

wherein the processor is configured to configure, to the UE, a list of aperiodic SRS trigger states, wherein each aperiodic SRS trigger state is associated with the one or more SRS resource sets.
The base station of claim 61, wherein for each SRS resource set, the processor is configured to configure, to the UE, one or more SRS resources.
The base station of claim 61, wherein one aperiodic SRS trigger state is initiated with a downlink control information (DCI) field in a DCI format.
The base station of claim 63, wherein the DCI format comprises a DCI format 0_1, a DCI format 0_2, a DCI format 1_1, a DCI format 1_2, or a DCI format 2_3.
The base station of claim 63, wherein the DCI field comprises an SRS request bit-field.
The base station of claim 63, wherein a size of the DCI field is fixed to one value.
The base station of claim 63, wherein a size of the DCI field is predefined or pre-specified.
The base station of claim 63, wherein a size of the DCI field is configured by a radio resource control (RRC) parameter.
The base station of claim 63, wherein the DCI field in the DCI format triggers one SRS resource set associated with a value configured in SRS resource set.
The base station of claim 63, wherein all bits in the DCI field are set to zero, no aperiodic SRS is triggered.
The base station of claim 63, wherein when a number of configured aperiodic SRS trigger states is greater than 2 ^N-1, where N is a number of bits in the DCI field, the transceiver transmits a subselection command that is used to map up to 2 ^N-1 aperiodic SRS trigger states to codepoints of the DCI field.
The base station of claim 71, wherein when the transceiver receives a physical uplink control channel (PUCCH) with a hybrid automatic repeat request-acknowledge (HARQ-ACK) information in a slot n corresponding a physical downlink shared channel (PDSCH) carrying the subselection command, a mapping of aperiodic SRS trigger states to the codepoints of the DCI field is made.
The base station of claim 72, wherein the mapping is applied starting from a first slot that is after slot
where μ is a subcarrier spacing (SCS) configuration for the PUCCH.
The base station of claim 63, wherein when a number of aperiodic SRS trigger states is less than or equal to 2 ^N-1, Nis a number of bits in the DCI field, the DCI field indicates the aperiodic SRS trigger state directly.
The base station of claim 61, wherein the one or more SRS resource sets are configured by at least one of higher layer parameters.
The base station of claim 75, wherein the at least one of the higher layer parameters comprises:

an SRS resource set identifier (ID) ;

a slot offset for a triggered SRS resource set;

a slot offset for each SRS resource in the triggered SRS resource set;

a spatial relation information configured to each SRS resource in the triggered SRS resource set;

a transmission configuration indicator (TCI) -state configured to each SRS resource in the triggered SRS resource set;

a usage parameter for the triggered SRS resource set;

a power control parameter for the triggered SRS resource set;

an associated channel state information reference signal (CSI-RS) resource;

a panel ID used to indicate a UE transmission (Tx) panel used to transmit the trigged SRS resource set; and

a parameter used to indicate a mode of Tx beam sweeping on SRS resources in the triggered SRS resource set.
The base station of claim 76, wherein the power control parameter comprises a target received power p0, a compensation factor alpha, a pathloss reference signal (RS) , and/or an SRS power control adjustment state.
The base station of claim 77, wherein a total number of different pathloss RSs configured in the aperiodic SRS trigger states is limited by a value N, where N is an integer.
The base station of claim 78, wherein N is predefined or pre-specified or based on UE capability.
The base station of claim 76, wherein the at least one of the high layer parameters is updated for one aperiodic SRS trigger state through a medium access control (MAC) control element (CE) .
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 40.
A chip, comprising:

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 method of any one of claims 1 to 40.
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 40.
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 40.
A computer program, wherein the computer program causes a computer to execute the method of any one of claims 1 to 40.