Flexible aperiodic sounding reference signal triggering

Abstract

Methods, systems, and devices for wireless communication are described. Generally, a base station can transmit a radio resource control (RRC) message that includes an indication of one or more available transmission time intervals (TTIs) for transmitting an aperiodic sounding reference signal (SRS). The base station can transmit one or more additional RRC messages that can include a non-periodic SRS resource trigger list parameter. One or more codepoints for SRS triggers can be mapped to the available TTIs indicated in the first RRC message. The base station can transmit a downlink control information (DCI) message that can trigger an SRS transmission according to the RRC message. The DCI message can include an SRS trigger and can indicate one or more SRS resource sets on which to transmit an aperiodic SRS. The UE can interpret the trigger as indicating an available slot to transmit the SRS based on the available TTI.

Description

[0001] Cross-references

[0002] This patent application claims the benefit of Greek patent application No. 20200100724 entitled “FLEXIBLEAPERIODIC SOUNDING REFERENCE SIGNAL TRIGGERING” filed by Abdelghaffar et al. on December 14, 2020, which has been assigned to the assignee of this application and is expressly incorporated herein by reference. Technical Field

[0003] The following pertains to wireless communication, including flexible, non-periodic probe reference signal triggering.

[0004] background

[0005] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, message sending and receiving, broadcasting, and so on. These systems can support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth-generation (4G) systems (such as Long Term Evolution (LTE) systems, LTE-A Advanced (LTE-A) systems, or LTE-A Pro systems) and fifth-generation (5G) systems, which may be referred to as New Radio (NR) systems. These systems can employ various technologies, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication from multiple communication devices, which may also be referred to as User Equipment (UE). In some examples, a base station may configure one or more UEs to transmit aperiodic probe reference signals (SRS).

[0006] Overview

[0007] The described techniques relate to improved methods, systems, devices, and apparatuses that support flexible aperiodic sounding reference signal triggering. Generally, the described techniques relate to improved methods, systems, devices, and apparatuses that support flexible aperiodic sounding reference signal (SRS) triggering. Generally, a base station can transmit a radio resource control (RRC) message (e.g., an AvailableSlotList RRC parameter) that includes an indication of one or more available transmission time intervals (TTIs) (e.g., available slots) for transmitting aperiodic SRS. The base station can transmit one or more additional RRC messages that can include configuration information, such as an aperiodic SRS resource trigger list parameter. Such configuration information can provide one or more codepoints for SRS triggering that can be mapped to the available TTIs indicated in the first RRC message. Subsequently, the base station can transmit a downlink control information (DCI) message that can trigger SRS transmission according to the received RRC messages. The DCI message can include an SRS trigger (e.g., a two-bit aperiodic SRS trigger) and can indicate one or more SRS resource sets on which to transmit aperiodic SRS. A UE can receive the DCI message and can transmit one or more SRS on the indicated aperiodic SRS resource sets. The UE can identify a codepoint (e.g., an SRS trigger) that is mapped to or otherwise corresponds to the first RRC message. For example, the first RRC message can indicate a set of available TTIs, and each codepoint of the SRS trigger can be mapped to one available TTI. In some examples, the first RRC message can indicate a single available TTI (e.g., a single offset value), and each codepoint can correspond to an additional offset or delay that can be added to or otherwise combined with the indicated single available TTI. In some examples, one bit of the two-bit trigger can indicate inclusion of one of two configured finite sets, and one bit of the two-bit trigger can indicate one of two available TTIs in which to transmit aperiodic SRS.

[0008] A method for wireless communications at a user equipment (UE) is described. The method can include receiving, from a base station, a radio resource control message including an indication of one or more available transmission time intervals for transmitting aperiodic sounding reference signals, receiving, from the base station, a first downlink control information message triggering transmission of one or more aperiodic sounding reference signals on a set of sounding reference signal resources, and transmitting, to the base station, the one or more aperiodic sounding reference signals on the set of sounding reference signal resources during a first available transmission time interval, where the transmitting during the first available transmission time interval is based on a first codepoint of the first downlink control information message and the indication of the one or more available transmission time intervals.

[0009] An apparatus for wireless communications at a UE is described. The apparatus can include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions can be executable by the processor to cause the apparatus to receive, from a base station, a radio resource control message including an indication of one or more available transmission time intervals for transmitting aperiodic sounding reference signals, receive, from the base station, a first downlink control information message triggering transmission of one or more aperiodic sounding reference signals on a set of sounding reference signal resources, and transmit, to the base station, the one or more aperiodic sounding reference signals on the set of sounding reference signal resources during a first available transmission time interval, where the transmitting during the first available transmission time interval is based on a first codepoint of the first downlink control information message and the indication of the one or more available transmission time intervals.

[0010] Another apparatus for wireless communications at a UE is described. The apparatus can include means for receiving, from a base station, a radio resource control message including an indication of one or more available transmission time intervals for transmitting aperiodic sounding reference signals, means for receiving, from the base station, a first downlink control information message triggering transmission of one or more aperiodic sounding reference signals on a set of sounding reference signal resources, and means for transmitting, to the base station, the one or more aperiodic sounding reference signals on the set of sounding reference signal resources during a first available transmission time interval, where the transmitting during the first available transmission time interval is based on a first codepoint of the first downlink control information message and the indication of the one or more available transmission time intervals.

[0011] A non-transitory computer-readable medium storing code for wireless communications at a UE is described. The code can include instructions executable by a processor to receive, from a base station, a radio resource control message including an indication of one or more available transmission time intervals for transmitting aperiodic sounding reference signals, receive, from the base station, a first downlink control information message triggering transmission of one or more aperiodic sounding reference signals on a sounding reference signal resource set, and transmit, to the base station, the one or more aperiodic sounding reference signals on the sounding reference signal resource set during a first available transmission time interval, where the transmitting during the first available transmission time interval is based on a first codepoint of the first downlink control information message and the indication of the one or more available transmission time intervals.

[0012] In some examples of the method, apparatuses, and non-transitory computer- readable media described herein, the indication of the one or more available transmission time intervals can include operations, features, means, or instructions for an indication of a set of multiple available transmission time intervals, each available transmission time interval of the set of available transmission time intervals corresponding to a respective codepoint of a set of codepoints including the first codepoint of the first downlink control information message.

[0013] In some examples of the method, apparatuses, and non-transitory computer- readable media described herein, the indication of the one or more available transmission time intervals can include operations, features, means, or instructions for an indication of a single available transmission time interval, where a set of offset values from the single available transmission time interval correspond to respective codepoints of a set of codepoints including the first codepoint of the first downlink control information message.

[0014] Some examples of the method, apparatuses, and non-transitory computer-readable media described herein can further include operations, features, means, or instructions for adding a first offset value of the set of offset values to the single available transmission time interval, the first offset value corresponding to the first codepoint and identifying the first available transmission time interval based on the adding.

[0015] In some examples of the method, apparatuses, and non-transitory computer- readable media described herein, the indication of the one or more available transmission time intervals can include operations, features, means, or instructions for an indication of a first available transmission time interval and a second available transmission time interval.

[0016] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for receiving an aperiodic probe reference signal triggering in a first downlink control information message, including a first code point, wherein the first code point includes a first bit indicating the configuration of the first probe reference signal triggered by the aperiodic probe reference signal triggering and a second bit indicating a first available transmission time interval triggered by the aperiodic probe reference signal triggering.

[0017] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means, or instructions for receiving control messages from a base station, the control messages including indications of one or more updated available transmission time intervals for transmitting an aperiodic probe reference signal, one or more updated values ​​of a set of code points including a first code point, or any combination thereof.

[0018] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, control messages include Media Access Control (MAC) control elements (CEs).

[0019] In some examples of the methods, apparatus (devices) and nontransient computer-readable media described herein, an indication of one or more updated available transmission time intervals for transmitting an aperiodic probe reference signal may include operations, features, means, or instructions for adding or removing one or more entries in a table indicating the available transmission time interval, or instructions for enabling or disabling one or more entries in a table indicating the available transmission time interval, or both.

[0020] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, indications of one or more updated values ​​of a set of code points may include operations, features, means, or instructions for adding or removing one or more code points from the set of code points, or for enabling or disabling one or more code points from the set of code points, or both.

[0021] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, MAC-CE includes instructions for modifying the mapping between the code point set and the available transmission time interval.

[0022] Examples of methods, apparatus (devices), and non-transient computer-readable media described herein may further include operations, features, means, or instructions for: receiving a second radio resource control message from a base station, the second radio resource control message including a time slot offset value indicating a second available transmission time interval for transmitting an aperiodic probe reference signal; receiving a second downlink control information message from the base station, the second downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a second probe reference signal resource set; and transmitting one or more aperiodic probe reference signals to the base station on the second probe reference signal resource set during the second available transmission time interval, wherein the transmission during the second available transmission time interval may be based on determining that one or more probe reference signal configuration conditions can be met.

[0023] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for determining that a second radio resource control message does not include an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal, wherein the transmission of one or more aperiodic probe reference signals during the second available transmission time interval may be based on this determination.

[0024] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for receiving, in a second radio resource control message, an instruction to use a time slot offset value indicating a second available transmission time interval, wherein transmission of one or more aperiodic probe reference signals during the second available transmission time interval may be based on receiving the instruction.

[0025] Examples of methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for identifying the format of a second downlink control information message, a core resource set associated with the second downlink control information message, a synchronization signal associated with the second downlink control information message, or any combination thereof, wherein the transmission of one or more aperiodic probe reference signals during a second available transmission time interval may be based on the identification.

[0026] Some examples of the methods, apparatus (devices), and non-transient computer-readable media described herein may further include operations, features, means, or instructions for: receiving a second radio resource control message from a base station, the second radio resource control message including a second indication of one or more available transmission time intervals for transmitting aperiodic probe reference signals; receiving a second downlink control information message from the base station, the second downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a second probe reference signal resource set, wherein the first downlink control information message may be a scheduled downlink control information message, and the second downlink control information message may be a non-scheduled downlink control information message including an indication of a second available transmission time interval; and transmitting one or more aperiodic probe reference signals to the base station on the second probe reference signal resource set during the second available transmission time interval, wherein the transmission during the second available transmission time interval may be based on the indication of the second available transmission time interval.

[0027] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means, or instructions for: identifying a third available transmission time interval based on a second code point of a second downlink control information message and a second indication of one or more available transmission time intervals; and prioritizing the second available transmission time interval based on the fact that the second downlink control information message is a non-scheduled downlink control information message.

[0028] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means, or instructions for: receiving an aperiodic probe reference signal triggering a second code point in a second downlink control information message, wherein the second code point includes a first bit indicating a second available transmission time interval for non-scheduling the downlink control information message and a second bit indicating a third available transmission time interval for scheduling the downlink control information message; and prioritizing the second available transmission time interval based on receiving the second downlink control information message.

[0029] A method for wireless communication at a base station is described. The method may include: transmitting a radio resource control message to a UE, the radio resource control message including an indication of one or more available transmission time intervals for transmitting aperiodic breakthrough reference signals; transmitting a first downlink control information message to the UE, the first downlink control information message triggering the transmission of one or more aperiodic breakthrough reference signals on a breakthrough reference signal resource set; and receiving one or more aperiodic breakthrough reference signals from the UE on the breakthrough reference signal resource set during the first available transmission time interval, wherein the reception during the first available transmission time interval is based on a first code point of the first downlink control information message and the indication of the one or more available transmission time intervals.

[0030] An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. These instructions are executable by the processor to cause the apparatus to: transmit a radio resource control message to a UE, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal; transmit a first downlink control information message to the UE, the first downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a probe reference signal resource set; and receive one or more aperiodic probe reference signals from the UE on the probe reference signal resource set during the first available transmission time interval, wherein the reception during the first available transmission time interval is based on a first code point of the first downlink control information message and the indication of one or more available transmission time intervals.

[0031] Another apparatus for wireless communication at a base station is described. The apparatus may include: means for transmitting a radio resource control message to a UE, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal; means for transmitting a first downlink control information message to the UE, the first downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a probe reference signal resource set; and means for receiving one or more aperiodic probe reference signals from the UE on the probe reference signal resource set during a first available transmission time interval, wherein the reception during the first available transmission time interval is based on a first code point of the first downlink control information message and the indication of one or more available transmission time intervals.

[0032] A non-transient computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to: transmit a radio resource control message to a UE, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal; transmit a first downlink control information message to the UE, the first downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a probe reference signal resource set; and receive one or more aperiodic probe reference signals from the UE on the probe reference signal resource set during a first available transmission time interval, wherein the reception during the first available transmission time interval is based on a first code point of the first downlink control information message and the indication of one or more available transmission time intervals.

[0033] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, an indication of one or more available transmission time intervals may include operations, features, means, or instructions for the following actions: indicating a set of multiple available transmission time intervals, each of which corresponds to a corresponding code point in a set of code points including a first code point of a first downlink control information message.

[0034] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, an indication of one or more available transmission time intervals may include operations, features, means, or instructions for the following action: an indication of a single available transmission time interval, wherein a set of offset values ​​from the single available transmission time interval corresponds to a corresponding code point in a set of code points that includes a first code point of a first downlink control information message.

[0035] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for: adding a first offset value from a set of offset values ​​to a single available transmission time interval, the first offset value corresponding to a first code point; and identifying the first available transmission time interval based on the addition.

[0036] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the indication of one or more available transmission time intervals may include operations, features, means, or instructions for indicating a first available transmission time interval and a second available transmission time interval.

[0037] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for transmitting an aperiodic probe reference signal triggering including a first code point in a first downlink control information message, wherein the first code point includes a first bit indicating the configuration of the first probe reference signal triggering and a second bit indicating a first available transmission time interval of the aperiodic probe reference signal triggering.

[0038] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for transmitting control messages to the UE, the control messages including indications of one or more updated available transmission time intervals for transmitting an aperiodic probe reference signal, one or more updated values ​​of a set of code points including a first code point, or any combination thereof.

[0039] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, control messages include MAC control elements (CEs).

[0040] In some examples of the methods, apparatus (devices) and nontransient computer-readable media described herein, an indication of one or more updated available transmission time intervals for transmitting an aperiodic probe reference signal may include operations, features, means, or instructions for adding or removing one or more entries in a table indicating the available transmission time interval, or instructions for enabling or disabling one or more entries in a table indicating the available transmission time interval, or both.

[0041] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, indications of one or more updated values ​​of a set of code points may include operations, features, means, or instructions for adding or removing one or more code points from the set of code points, or for enabling or disabling one or more code points from the set of code points, or both.

[0042] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, MAC-CE includes instructions for modifying the mapping between the code point set and the available transmission time interval.

[0043] Examples of methods, apparatus (devices), and non-transient computer-readable media described herein may further include operations, features, means, or instructions for: transmitting a second radio resource control message to a UE, the second radio resource control message including a time slot offset value indicating a second available transmission time interval for transmitting an aperiodic probe reference signal; transmitting a second downlink control information message to the UE, the second downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a second probe reference signal resource set; and receiving one or more aperiodic probe reference signals from the UE on the second probe reference signal resource set during the second available transmission time interval, wherein the reception during the second available transmission time interval may be based on determining that one or more probe reference signal configuration conditions can be met.

[0044] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for determining that a second radio resource control message does not include an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal, wherein receiving one or more aperiodic probe reference signals during the second available transmission time interval may be based on that determination.

[0045] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for transmitting in a second radio resource control message an instruction for using a time slot offset value indicating a second available transmission time interval, wherein receiving one or more aperiodic probe reference signals during the second available transmission time interval may be based on transmitting the instruction.

[0046] Examples of methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for identifying the format of a second downlink control information message, a core resource set associated with the second downlink control information message, a synchronization signal associated with the second downlink control information message, or any combination thereof, wherein receiving one or more aperiodic probe reference signals during a second available transmission time interval may be based on the identification.

[0047] Examples of methods, apparatus (devices), and non-transient computer-readable media described herein may further include operations, features, means, or instructions for: transmitting a second radio resource control message to a base station, the second radio resource control message including a second indication of one or more available transmission time intervals for transmitting aperiodic probe reference signals; transmitting a second downlink control information message to a UE, the second downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a second probe reference signal resource set, wherein the first downlink control information message may be a scheduled downlink control information message, and the second downlink control information message may be a non-scheduled downlink control information message including an indication of a second available transmission time interval; and receiving one or more aperiodic probe reference signals from the UE on the second probe reference signal resource set during the second available transmission time interval, wherein the reception during the second available transmission time interval may be based on the indication of the second available transmission time interval.

[0048] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means, or instructions for: identifying a third available transmission time interval based on a second code point of a second downlink control information message and a second indication of one or more available transmission time intervals; and prioritizing the second available transmission time interval based on the fact that the second downlink control information message is a non-scheduled downlink control information message.

[0049] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means, or instructions for: transmitting an aperiodic probe reference signal triggering, including a second code point, in a second downlink control information message, wherein the second code point includes a first bit of the aperiodic probe reference signal triggering indicating a second available transmission time interval for non-scheduling the downlink control information message and a second bit of the aperiodic probe reference signal triggering indicating a third available transmission time interval for scheduling the downlink control information message; and prioritizing the second available transmission time interval based on receiving the second downlink control information message. Brief description of the attached diagram

[0051] Figure 1 Examples of wireless communication systems that support flexible, non-periodic probe reference signal triggering according to various aspects of this disclosure are explained.

[0052] Figure 2 Examples of wireless communication systems that support flexible, non-periodic probe reference signal triggering according to various aspects of this disclosure are explained.

[0053] Figure 3 An example of a timeline for flexible, non-periodic probe reference signal triggering, supported by various aspects of this disclosure, is explained.

[0054] Figure 4 An example of a process flow that supports flexible, non-periodic probe reference signal triggering according to various aspects of this disclosure is explained.

[0055] Figure 5 An example of a control message triggered by a flexible, non-periodic probe reference signal, in accordance with various aspects of this disclosure, is explained.

[0056] Figure 6 and 7 A diagram is shown illustrating a device that supports flexible, non-periodic probe reference signal triggering according to various aspects of this disclosure.

[0057] Figure 8 A diagram is shown illustrating a communication manager that supports flexible, non-periodic probe reference signal triggering according to various aspects of this disclosure.

[0058] Figure 9 A diagram of a system including a device that supports flexible, non-periodic probe reference signal triggering, according to various aspects of this disclosure, is shown.

[0059] Figure 10 and 11 A diagram is shown illustrating a device that supports flexible, non-periodic probe reference signal triggering according to various aspects of this disclosure.

[0060] Figure 12 A diagram is shown illustrating a communication manager that supports flexible, non-periodic probe reference signal triggering according to various aspects of this disclosure.

[0061] Figure 13 A diagram of a system including a device that supports flexible, non-periodic probe reference signal triggering, according to various aspects of this disclosure, is shown.

[0062] Figures 14 to 18 A flowchart illustrating a method for triggering a flexible, non-periodic probe reference signal according to various aspects of this disclosure is shown.

[0063] Detailed description

[0064] Some wireless communication systems support aperiodic probe reference signal (SRS) transmission. The base station can transmit a radio resource control (RRC) message indicating a static slot offset value. The UE can transmit aperiodic SRS over several transmission time intervals (TTIs) (e.g., the indicated slot offset value) after receiving permission to trigger SRS transmission (e.g., in a downlink control information (DCI) message). However, such schemes may lack the flexibility to assign different slots to different SRS resource sets, or may be associated with high overhead. For example, additional DCI code points for each SRS resource set can indicate the offset. However, DCI fields are finite, and such additional DCI code points can reduce the effectiveness of the DCI field. In some examples, such extra bits can be added to the DCI, resulting in an increased DCI size and degraded physical downlink control channel (PDCCH) reception due to DCI overhead.

[0065] The base station may transmit an RRC message to the UE, which includes RRC parameters (e.g., AvailableSlotList RRC parameters) indicating a set of values ​​for different available slots. The base station may transmit a DCI that triggers aperiodic SRS transmissions. The trigger may include a two-bit indicator, and the UE may interpret the code point of this two-bit indicator to implicitly indicate one of the available slots listed in the RRC parameters. The UE may identify available slots based on a 1:1 mapping between the triggered code point and the values ​​of different available slots, or the RRC parameter may indicate a single value, and each code point of the trigger may correspond to an offset that can be added to that single value, and so on. In some examples, the base station may use a bit splitting scheme (e.g., one bit indicating configuration / type and one bit indicating one of two available slots) to indicate available slots. The base station may use a new format to transmit Media Access Control (MAC) Control Elements (CE) MAC-CE to dynamically update available slots in the available slot list, other configured RRC values, or DCI code points, or any combination thereof.

[0066] The techniques described herein can be implemented to achieve one or more advantages. For example, devices in wireless communication systems can schedule aperiodic SRS transmissions more flexibly and therefore more efficiently, resulting in increased system efficiency, efficient use of available resources, reduced system congestion, reduced system latency, etc. Additionally, such techniques can be implemented without sacrificing the size and efficiency of DCI signaling and decoding, or without increasing overhead. In some examples, the techniques described herein can be backward compatible, so that the advantages described herein do not introduce compatibility issues between devices of different capabilities or generations.

[0067] The aspects of this disclosure are initially described in the context of a wireless communication system. The aspects of this disclosure are further explained and described with reference to timelines, process flows, and control messages. The aspects of this disclosure are further explained and described with reference to apparatus (device) diagrams, system diagrams, and flowcharts related to flexible, aperiodic probe reference signal triggering.

[0068] Figure 1 Examples of a wireless communication system 100 supported by various aspects of this disclosure, including flexible, non-periodic probe reference signal triggering, are described. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an Advanced LTE (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low latency communication, communication with low-cost and low-complexity devices, or any combination thereof.

[0069] Base station 105 can be distributed across a geographical area to form wireless communication system 100, and can be different types of devices or devices with different capabilities. Base station 105 and UE 115 can communicate wirelessly via one or more communication links 125. Each base station 105 can provide a coverage area 110, and UE 115 and base station 105 can establish one or more communication links 125 on the coverage area 110. Coverage area 110 can be an example of a geographical area over which base station 105 and UE 115 can support signal communication according to one or more radio access technologies.

[0070] Each UE 115 can be distributed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 can be stationary or mobile, or stationary and mobile at different times. Each UE 115 can be a different type of device or a device with different capabilities. Figure 1 The document describes some example UE 115s. The UE 115 described herein can communicate with various types of devices, such as other UE 115s, base station 105, or network equipment (e.g., core network nodes, relay equipment, integrated access and backhaul (IAB) nodes, or other network equipment). Figure 1 As shown in the image.

[0071] Each base station 105 may communicate with the core network 130, or with each other, or both. For example, base station 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base stations 105 may communicate with each other directly (e.g., directly between base stations 105), indirectly (e.g., via the core network 130), or directly and indirectly on backhaul links 120 (e.g., via X2, Xn, or other interfaces). In some examples, backhaul link 120 may be or include one or more radio links.

[0072] One or more of the base stations 105 described herein may include, or may be referred to by those skilled in the art as, base transceiver station, radio base station, access point, radio transceiver, B node, evolved B node (eNB), next-generation B node or gigabit B node (any of which may be referred to as gNB), home B node, home evolved B node, or other suitable terms.

[0073] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or any other suitable term, wherein "device" may also be referred to as a cell, station, terminal, or client, etc. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0074] The UE 115 described herein can communicate with various types of devices, such as other UEs 115 that sometimes act as relays, as well as base station 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, relay base stations, etc. Figure 1 As shown in the image.

[0075] UE 115 and base station 105 can wirelessly communicate with each other via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communication link 125. For example, a carrier for communication link 125 may include a portion of the radio spectrum band (e.g., a bandwidth portion (BWP)) operating according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling coordinating carrier operation, user data, or other signaling. Wireless communication system 100 may support communication with UE 115 using carrier aggregation or multi-carrier operation. UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation can be used in conjunction with frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0076] In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers. The carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel grid for discovery by UE 115. The carrier may operate in an autonomous mode in which initial acquisition and connection can be performed by UE 115 via that carrier, or in a non-autonomous mode in which the carrier may connect to carriers anchored using different carriers (e.g., different carriers of the same or different radio access technologies).

[0077] The communication link 125 shown in the wireless communication system 100 may include uplink transmission from UE 115 to base station 105, or downlink transmission from base station 105 to UE 115. The carrier may carry downlink or uplink communication (e.g., in FDD mode), or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0078] A carrier may be associated with a specific bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth may be one of several defined bandwidths (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz) of a carrier for a particular radio access technology. Devices of the wireless communication system 100 (e.g., base station 105, UE 115, or both) may have a hardware configuration that supports communication over a specific carrier bandwidth, or may be configurable to support communication over a single carrier bandwidth within a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate over a portion (e.g., a subband, BWP) or all of the carrier bandwidth.

[0079] The signal waveform transmitted on the carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform extended OFDM (DFT-S-OFDM)). In a system employing MCM, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the code rate of the modulation scheme, or both). Thus, the more resource elements the UE 115 receives and the higher the order of the modulation scheme, the higher the data rate the UE 115 can achieve. Wireless communication resources can refer to a combination of radio frequency spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and using multiple spatial layers can further improve the data rate or data integrity of communication with the UE 115.

[0080] One or more parameter designs for a carrier can be supported, where the parameter design may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier can be divided into one or more BWPs with the same or different parameter designs. In some examples, UE 115 can be configured with multiple BWPs. In some examples, a single BWP for a carrier can be active at a given time, and communication for UE 115 can be limited to one or more active BWPs.

[0081] The time interval of base station 105 or UE 115 can be expressed as a multiple of a basic time unit, such as the sampling period T. s =1 / (Δf) max ·N f ) seconds, where Δf max This can represent the maximum supported subcarrier spacing, while Nf This can represent the maximum supported Discrete Fourier Transform (DFT) size. The time interval of the communication resources can be organized according to radio frames, each with a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0082] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may (e.g., in the time domain) be divided into subframes, and each subframe may be further divided into several time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include several symbol periods (e.g., depending on the length of the cyclic prefix added before each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple mini-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N) symbols. f (Number) sampling periods. The duration of a symbol period can depend on the subcarrier interval or the operating frequency band.

[0083] A subframe, time slot, mini-slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0084] Physical channels can be multiplexed on a carrier using various techniques. Physical control channels and physical data channels can be multiplexed on a downlink carrier, for example, using one or more of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) for physical control channels can be defined by the number of symbol periods and can extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) can be configured for a set of UEs 115. For example, one or more of the UEs 115 can monitor or search control regions for control information based on one or more search space sets, and each search space set can include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for control channel candidates can refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information in a control information format having a given payload size. The search space set may include a common search space set configured to send control information to multiple UEs 115 and a UE-specific search space set configured to send control information to a specific UE 115.

[0085] Each base station 105 may provide communication coverage via one or more cells (e.g., macrocells, small cells, hotspots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used to communicate with base station 105 (e.g., on a carrier) and may be associated with an identifier used to distinguish adjacent cells (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID), or others). In some examples, a cell may also refer to a geographic coverage area 110 or a portion of geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. The extent of such cells may vary from smaller areas (e.g., structures, subsets of structures) to larger areas depending on various factors (such as the capabilities of base station 105). For example, a cell may be or include buildings, subsets of buildings, or external space between or overlapping geographic coverage areas 110, among other examples.

[0086] Macrocells typically cover a relatively large geographic area (e.g., a radius of several kilometers) and allow unrestricted access for UEs 115 that have service subscriptions with a network provider supporting the macrocell. Small cells may be associated with a lower-power base station 105 (compared to macrocells) and may operate in the same or different (e.g., licensed or unlicensed) frequency bands as macrocells. Small cells may provide unrestricted access to UEs 115 that have service subscriptions with a network provider, or may provide restricted access to UEs 115 associated with the small cell (e.g., UEs 115 in a Closed Subscriber Group (CSG), or UEs 115 associated with a user in a home or office). Base station 105 may support one or more cells and may also support communication on one or more cells using one or more component carriers.

[0087] In some examples, a carrier can support multiple cells and can be configured with different cells based on different protocol types that can provide access for different types of devices (e.g., MTC, Narrowband IoT (NB-IoT), Enhanced Mobile Broadband (eMBB)).

[0088] In some examples, base station 105 may be mobile, and thus provide communication coverage to mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. Wireless communication system 100 may include, for example, a heterogeneous network, in which different types of base stations 105 use the same or different radio access technologies to provide coverage to various geographic coverage areas 110.

[0089] The wireless communication system 100 can support synchronous or asynchronous operation. For synchronous operation, base stations 105 can have similar frame timing, and transmissions from different base stations 105 can be approximately time-aligned. For asynchronous operation, base stations 105 can have different frame timing, and transmissions from different base stations 105 may not be time-aligned in some examples. The techniques described herein can be used for both synchronous and asynchronous operation.

[0090] Some UE 115 devices (such as MTC or IoT devices) can be low-cost or low-complexity devices and can provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with base station 105 without human intervention. In some examples, M2M communication or MTC may include communication from devices that have integrated sensors or meters to measure or capture information and relay such information to a central server or application that uses the information or presents it to people interacting with the application. Some UE 115 devices may be designed to collect information or automate the behavior of machines or other devices. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wilderness survival monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial toll collection.

[0091] Some UEs 115 can be configured to operate in reduced-power modes, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication can be performed at a reduced peak rate. Other power-saving techniques for UEs 115 include entering a power-saving deep sleep mode when not engaged in active communication, operating on limited bandwidth (e.g., according to narrowband communication), or a combination of these techniques. For example, some UEs 115 can be configured to operate using a narrowband protocol type associated with a defined portion or range (e.g., subcarriers or resource block (RB) set) within the carrier, within the carrier's guard band, or outside the carrier.

[0092] Wireless communication system 100 may be configured to support ultra-reliable communication or low latency communication, or various combinations thereof. For example, wireless communication system 100 may be configured to support ultra-reliable low latency communication (URLLC) or mission-critical communication. UE 115 may be designed to support ultra-reliable, low latency, or mission-critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private or group communication and may be supported by one or more mission-critical services, such as Mission-Critical Talk-to-Talk (MCPTT), Mission-Critical Video (MCVideo), or Mission-Critical Data (MCData)). Support for mission-critical functions may include prioritization of services, and mission-critical services may be used for public safety or general business applications. The terms ultra-reliable, low latency, mission-critical, and ultra-reliable low latency are used interchangeably herein.

[0093] In some examples, UE 115 may also be able to communicate directly with other UE 115 on a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UE 115s utilizing D2D communication may be within the geographic coverage area 110 of base station 105. Other UE 115s in such a group may be outside the geographic coverage area 110 of base station 105 or may be unable to receive transmissions from base station 105 for other reasons. In some examples, groups of UE 115s communicating via D2D communication may utilize a one-to-many (1:M) system, where each UE 115 transmits to every other UE 115 in the group. In some examples, base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between the individual UE 115s without involving base station 105.

[0094] In some systems, the D2D communication link 135 may be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, vehicles may communicate using vehicle-to-vehicle (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these communications. Vehicles may signal information related to traffic conditions, signaling, weather, safety, emergencies, or any other information relevant to the V2X system. In some examples, vehicles in a V2X system may communicate via vehicle-to-network (V2N) communication through one or more network nodes (e.g., base station 105) with roadside infrastructure (such as roadside units), or with the network, or with both.

[0095] Core network 130 provides user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC) or a 5G core (5GC). The EPC or 5GC may include at least one control plane entity (e.g., a Mobility Management Entity (MME), Access and Mobility Management Function (AMF)) managing access and mobility, and at least one user plane entity (e.g., a Serving Gateway (S-GW), Packet Data Network (PDN) Gateway (P-GW), or User Plane Function (UPF)) routing packets or interconnecting to external networks. The control plane entity manages non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by base station 105 associated with core network 130. User IP packets can be delivered through the user plane entity, which provides IP address allocation and other functions. The user plane entity may be connected to one or more network operator IP services 150. The IP service 150 may include access to the Internet, intranet, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0096] Some network devices (such as base station 105) may include sub-components, such as access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with each UE 115 through one or more other access network transport entities 145, which may be referred to as a radio headend, smart radio headend, or transmit / receive point (TRP). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio headends and ANCs) or combined into a single network device (e.g., base station 105).

[0097] Wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 MHz to 300 GHz. Generally, the 300 MHz to 3 GHz band is referred to as a UHF band or decimeter band because the wavelengths range from approximately 1 decimeter to 1 meter. UHF waves can be blocked or redirected by buildings and environmental features, but these waves can penetrate various structures sufficiently for macrocells to provide service to UE 115 located indoors. Compared to transmissions using smaller frequencies and longer waves in the lower HF or VHF portions of the spectrum below 300 MHz, UHF wave transmission can be associated with smaller antennas and shorter ranges (e.g., less than 100 km).

[0098] The wireless communication system 100 can also operate in the ultra-high frequency (SHF) zoning using a frequency band from 3 GHz to 30 GHz (also known as the centimeter band) or in the extremely high frequency (EHF) zoning using a spectrum (e.g., from 30 GHz to 300 GHz) (also known as the millimeter band). In some examples, the wireless communication system 100 can support millimeter-wave (mmW) communication between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices can be smaller and more closely spaced than UHF antennas. In some examples, this can facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may suffer even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein can be employed across transmissions using one or more different frequency zonings, and the frequency band usage specified across these frequency zonings may vary by country or regulatory authority.

[0099] Wireless communication system 100 may utilize both licensed and unlicensed radio spectrum bands. For example, wireless communication system 100 may employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in unlicensed frequency bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band). When operating in unlicensed radio spectrum bands, devices (such as base station 105 and UE 115) may employ carrier sensing for collision detection and avoidance. In some examples, operation in unlicensed frequency bands may be based on carrier aggregation configuration (e.g., LAA) in coordination with component carriers operating in licensed frequency bands. Operation in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, etc.

[0100] Base station 105 or UE 115 may be equipped with multiple antennas that can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels that can support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly (such as an antenna tower). In some examples, the antennas or antenna arrays associated with base station 105 may be located in different geographical locations. Base station 105 may have an antenna array with several rows and columns of antenna ports that base station 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0101] Base station 105 or UE 115 can use MIMO communication to leverage multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. This technique is known as spatial multiplexing. For example, a transmitting device may transmit multiple signals via different antennas or different combinations of antennas. Similarly, a receiving device may receive multiple signals via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO), where multiple spatial layers are transmitted to the same receiving device; and multi-user MIMO (MU-MIMO), where multiple spatial layers are transmitted to multiple devices.

[0102] Beamforming (also known as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting or receiving device (e.g., base station 105, UE 115) to shape or guide an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array, such that some signals propagating relative to a particular orientation of the antenna array experience constructive interference, while others experience destructive interference. Adjustments to the signals transmitted via the antenna elements may include the transmitting or receiving device applying amplitude offset, phase offset, or both to the signals carried via the antenna elements associated with that device. The adjustments associated with each antenna element may be defined by a beamforming weight set associated with a particular orientation (e.g., the antenna array relative to the transmitting or receiving device, or relative to some other orientation).

[0103] Base station 105 or UE 115 may use beamsweeping techniques as part of beamforming operations. For example, base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by base station 105 in different directions. For example, base station 105 may transmit signals according to different beamforming weight sets associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by the transmitting device (such as base station 105) or the receiving device (such as UE 115)) to identify the beam direction that base station 105 will use for later transmission or reception.

[0104] Some signals (such as data signals associated with a specific receiving device) may be transmitted by base station 105 in a single beam direction (e.g., the direction associated with the receiving device (such as UE 115)). In some examples, the beam direction associated with transmission along a single beam direction may be determined based on the signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signals received by UE 115 with the highest signal quality or other acceptable signal quality.

[0105] In some examples, transmissions performed by a device (e.g., by base station 105 or UE 115) may be executed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate combined beams for transmission (e.g., from base station 105 to UE 115). UE 115 may report feedback indicating precoding weights for one or more beam directions, and this feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. Base station 105 may transmit reference signals that may be precoded or unprecoded (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)). UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel type codebook, linear combination type codebook, port selection type codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may use similar techniques to transmit signals multiple times in different directions (e.g., to identify the beam direction used by UE 115 for subsequent transmission or reception) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0106] A receiver device (e.g., UE 115) may attempt multiple receive configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105. For example, the receiver device may attempt multiple receive directions by: receiving via different antenna subarrays; processing received signals according to different antenna subarrays; receiving according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of the antenna array (e.g., different directional listening weight sets); or processing received signals according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of the antenna array, any of which may be referred to as "listening" according to different receive configurations or receive directions. In some examples, the receiver device may use a single receive configuration to receive along a single beam direction (e.g., when receiving a data signal). The single receive configuration may be aligned on a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0107] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer can be IP-based. The Radio Link Control (RLC) layer performs packet segmentation and reassembly for communication on logical channels. The Media Access Control (MAC) layer performs priority handling and multiplexes logical channels into transport channels. The MAC layer can also use error detection, error correction, or both to support MAC layer retransmissions to improve link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer can provide the establishment, configuration, and maintenance of RRC connections between the UE 115 and the base station 105 or core network 130 that support user plane data radio bearers. At the physical layer, transport channels can be mapped to physical channels.

[0108] UE 115 and base station 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique used to increase the likelihood of correctly receiving data on communication link 125. HARQ may include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), forward error correction (FEC), and retransmission (e.g., Automatic Repeat Request (ARQ)). HARQ can improve MAC layer throughput in poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, the device may support simultaneous time-slot HARQ feedback, where the device can provide HARQ feedback in a specific time slot for data received in previous symbols within that time slot. In other cases, the device may provide HARQ feedback in subsequent time slots or according to a different time interval.

[0109] Base station 105 may transmit an RRC message to the UE, which includes RRC parameters (e.g., AvailableSlotList RRC parameters) indicating a set of values ​​for different available slots. Base station 105 may transmit a DCI that triggers aperiodic SRS transmissions. The trigger may include a two-bit indicator, and UE 115 may interpret the code point of the two-bit indicator to implicitly indicate one of the available slots listed in the RRC parameters. UE 115 may identify available slots based on a 1:1 mapping between the triggered code point and the values ​​of different available slots, or the RRC parameter may indicate a single value, and each code point of the trigger may correspond to an offset that can be added to that single value, and so on. In some examples, the base station may use a bit splitting scheme (e.g., one bit indicating configuration / type and one bit indicating one of two available slots) to indicate available slots. Base station 105 may use a new format to transmit MAC-CE to dynamically update available slots in the available slot list, other configured RRC values, or DCI code points, or any combination thereof.

[0110] Figure 2 An example of a wireless communication system 200 supported by a flexible, non-periodic probe reference signal triggering according to various aspects of this disclosure is described. The wireless communication system 200 may include a base station 205 and a UE 215, which may be a reference... Figure 1 Example of the corresponding device described. Base station 205 can serve one or more UEs 215 located within coverage area 210.

[0111] Base station 205 can communicate with UE 215 via bidirectional communication link 220. In some examples, base station 205 can trigger one or more uplink transmissions of aperiodic SRS 235. UE 215 can transmit aperiodic SRS 235 based on configuration information (e.g., RRC signaling) and trigger DCI 225. For example, base station 205 can transmit RRC message 230. RRC message 230 may include one or more RRC parameters (e.g., slotOffset parameter) indicating the offset between receiving DCI 225 and transmitting SRS 235. For example, the offset may be a value between 9 and 32 TTIs. Base station 205 can transmit trigger DCI 225 to UE 215. Trigger DCI may include indications (e.g., a two-bit trigger or SRS request value). A trigger (e.g., an SRS-ResourceTrigger value) may indicate one or more SRS resource sets, one or more serving cell sets or carrier sets, or a combination thereof, configured by higher-layer signaling. For example, DCI 225 may include an SRS request field that includes a two-bit indicator or trigger. If the indicator is set to 0 (e.g., 00), the UE may determine that no aperiodic SRS resource set is triggered. If the indicator is set to 1 (e.g., 01), the UE 215 may determine that one or more SRS resource sets are configured for a first set of one or more serving cells. Similarly, if the indicator is set to 2 (e.g., 10), the UE 215 may determine that one or more SRS resource sets are configured for a second set of one or more serving cells. If the indicator is set to 3 (e.g., 11), the UE 215 may determine that one or more SRS resource sets are configured for a third set of one or more serving cells. Each SRS resource in the SRS resource set may have an associated symbol index that contains the first symbol of the SRS resource (e.g., the starting position) within a specific TTI (e.g., after the offset).

[0112] Therefore, UE 215 may determine, at least in part, the time and frequency resources within a TTI for transmitting SRS 235 according to the indicated SRS resource set (e.g., including the start position within the TTI) based on the received trigger DCI 225, and may determine the TTI in which the transmission of SRS 235 on the SRS resource set (e.g., which may span multiple coherent OFDM symbols) is initiated based on RRC message 230 (e.g., the offset value indicated in RRC message 230). In some examples, DCI format 0_1 ​​may schedule communication on the Physical Uplink Shared Channel (PUSCH) in a cell. Such a DCI may include an SRS request (e.g., a two-bit indicator that triggers aperiodic SRS transmission). Similarly, in some examples, DCI format 1_1 may schedule communication on the Physical Downlink Shared Channel (PDSCH) in a cell. Such a DCI may also include an SRS request (e.g., a two-bit indicator that triggers aperiodic SRS transmission). However, using the offset indicated in RRC message 230 to identify the timing for transmitting SRS 235 may be inflexible, leading to inefficient use of resources, increased latency, and so on.

[0113] In some examples, base station 205 can use dynamic signaling to more flexibly indicate aperiodic SRS slot offsets. For example, each SRS resource set can be configured with a list of slot offsets, where each code point in the DCI is associated with a specific offset value in that list. Alternatively, a slot offset list can be configured for all SRS resource sets, and each code point in the DCI can be associated with a specific offset value in that list. The indication of code points can reuse existing DCI fields to indicate slot offsets for different SRS resource sets, or new DCI fields can be added to indicate these slot offsets. However, reverting to legacy DCI fields can be expensive in terms of signaling overhead, and the DCI format can include a limited number of fields such that reverting to any of them could affect encoding, decoding, or potentially degrade performance in other ways. Additionally, in some examples, a single SRS code point can trigger multiple SRS resource sets, and for each SRS resource set, a DCI code point may be needed in such techniques to indicate the offset value. Therefore, reverting to legacy DCI fields for such dynamic explicit signaling can result in increased overhead in DCI signaling. Additionally, due to DCI overhead, failed transmissions, etc., adding a new DCI field may result in reduced decoding performance and degraded PDCCH and PDSCH reception.

[0114] In some examples, base station 205 may implicitly indicate a dynamic offset value for transmitting SRS 235 without reusing the DCI field or adding DCI overhead. Instead, a new RRC parameter (e.g., AvailableSlotList) may indicate multiple values ​​for the available TTIs in which aperiodic SRS 235 is transmitted. UE 215 may interpret an aperiodic SRS trigger in DCI 225 (e.g., a two-bit SRS resource request) as indicating one of the available TTIs indicated in the new RRC parameter. Therefore, base station 205 may dynamically indicate different offsets (e.g., different available TTIs in which SRS 235 transmission is to begin on the indicated SRS resource set) without reusing existing DCI fields or adding new DCI fields.

[0115] In some examples, base station 205 may configure UE 215 (e.g., via RRC signaling) to have an SRS request table. The SRS table may indicate the value of an SRS request field (e.g., an SRS trigger). The value of the SRS request field may trigger an aperiodic SRS 235, which may indicate one or more SRS resource sets configured to have entries in a higher-layer parameter aperiodicSRS-ResourceTrigger (aperiodic SRS resource trigger) set to match the value of the SRS request code point, or in a higher-layer parameter aperiodicSRS-ResourceTriggerList (aperiodic SRS resource trigger list) set to match the value of the SRS request code point.

[0116] In some examples, UE 215 can determine the available time slots for transmitting aperiodic SRS 235 based on reference time slots, such as reference... Figure 3 More detailed description.

[0117] Figure 3 An example of a timeline 300 supported by various aspects of this disclosure for flexible, non-periodic probe reference signal triggering is described. The timeline 300 can support communication between a base station 205 and one or more UEs 215, which can be references... Figure 1 and 2 Examples of the corresponding devices described.

[0118] UE 215 may receive DCI 310 from base station 205 and subsequently determine when to transmit the triggered aperiodic SRS 315. In some examples, UE 215 may transmit the aperiodic SRS resource set in the (t+1)th available time slot since the reference time slot count. The value of t may be indicated via higher-layer signaling (e.g., RRC signaling) or any combination thereof included in DCI 310. For example, a single value of t may be indicated in an RRC message, or multiple candidate values ​​of t may be indicated in an RRC message, and base station 205 may indicate one of the candidate values ​​of t in DCI 310. The candidate values ​​of t may include at least 0.

[0119] In some examples, the reference time slot may be time slot 305 in which UE 215 receives DCI 310-a. For example, DCI 310-a may trigger two aperiodic SRS resource sets 315 (e.g., aperiodic SRS resource set 315-a and aperiodic SRS resource set 315-b). Base station 205 may indicate (e.g., via RRC message, DCI 310-a, or both) t=0 for aperiodic SRS resource set 315-a and t=1 for aperiodic SRS resource set 315-b. The value of t may represent an available time slot 305. Based on the indication of the value of t, UE 215 may identify a first (e.g., next) available time slot 305 for transmitting aperiodic SRS resource set 315-a and a second available time slot 305 for transmitting aperiodic SRS resource set 315-b. Time slots 305-a, 305-b, and 305-c can be downlink time slots, time slot 305-d can be designated as a special time slot with available uplink and downlink symbols, and time slot 305-e can be an uplink time slot. In such an example, if the reference time slot is time slot 305-a in which UE 215 receives DCI 310-a, UE 215 can determine that the first available time slot 305 is time slot 305-d (e.g., the first time slot 305 after time slot 305-a in which uplink transmission of SRS is possible), and can determine that the second available time slot 305 is time slot 305-e (e.g., the second time slot 305 after the reference time slot (time slot 305-a) and the first available time slot 305-d). In such an example, UE 215 may transmit aperiodic SRS on aperiodic SRS resource set 315-a during time slot 305-d, and may transmit aperiodic SRS on aperiodic SRS resource set 315-b during time slot 305-e. Transmission of aperiodic SRS during the correct time period can be based on successfully identifying the offset from reference time slot 305-a to the next available time slot based on signaling from base station 205, as reference... Figure 4 More detailed description.

[0120] In some examples, the reference time slot can be time slot 305 indicated by an RRC message (e.g., the RRC slotOffset parameter). For example, base station 205 may indicate one or more time slot offset values ​​(e.g., 1 time slot, 2 time slots, etc.) in the RRC message. Base station 205 may indicate (e.g., via RRC message, DCI 310-a, or both) t=0 for aperiodic SRS resource set 315-a and t=1 for aperiodic SRS resource set 315-b. The value of t may represent the available time slot 305. Based on the indication of the value of t, UE 215 may identify a first (e.g., next) available time slot 305 for transmitting aperiodic SRS resource set 315-c and a second available time slot 305 for transmitting aperiodic SRS resource set 315-d. Time slots 305-f, 305-g, and 305-h can be downlink time slots, time slot 305-i can be designated as a special time slot with available uplink and downlink symbols, and time slot 305-j can be an uplink time slot. In such an example, the offset value can be offset 320-a (e.g., one time slot), and the reference time slot can therefore be time slot 305-g. UE 215 can receive DCI 310-b in time slot 305-f, apply offset 320-a to time slot 305-f, resulting in reference time slot 305-g. From reference time slot 305-g, UE 215 can identify the next available time slot 305-i after reference time slot 305-g (e.g., based on t=0). UE 215 can also determine that the second available time slot 305 is time slot 305-j (e.g., the second available time slot 305 after the reference time slot (time slot 305-g) and the first available time slot 305-i). Similarly, if the offset value indicates an offset of 320-b (e.g., 2 time slots), the reference time slot can be time slot 305-h (e.g., 2 time slots after time slot 305-f where UE 215 receives DCI 310-b). UE 215 can transmit aperiodic SRS on aperiodic SRS resource set 315-c during time slot 305-i, and can transmit aperiodic SRS on aperiodic SRS resource set 315-j during time slot 305-j. The transmission of aperiodic SRS during the correct time period can be based on the successful identification of the offset from reference time slot 305-g or reference time slot 305-h to the next available time slot 305, based on signaling from base station 205, as reference Figure 4 More detailed description.

[0121] In some examples, available time slot 305 (e.g., whether the reference time slot is the time slot in which DCI 310 is received or the time slot offset from the time slot in which DCI 310 is received) can be defined based on UE processing complexity, signaling timeline, etc., to determine available time slots, potential coexistence with conflict handling, etc. In some examples, base station 205 can indicate (e.g., via a new RRC parameter, such as AvailableSlotList) a set of available time slots that meet one or more conditions. For example, the available time slots indicated in such RRC parameters could be time slots that include uplink symbols or flexible symbols for the time domain positions of all SRS resources in the indicated resource set, which can satisfy the minimum timing requirements between triggering PDCCH and all SRS resources in the SRS resource set, etc.

[0122] In some examples, UE 215 may rely on implicit indications of available slots in which aperiodic SRS resource sets are to be transmitted. For example, UE 215 may interpret the code point of an SRS trigger (e.g., triggering an aperiodic SRS resource request in DCI 310) as indicating or associated with a value in a list of available slots configured via higher-layer signaling, as referenced. Figure 4 More detailed description.

[0123] Figure 4 An example of a process flow 400 supported by various aspects of this disclosure for flexible, non-periodic probe reference signal triggering is described. Process flow 400 may include one or more UEs 415, which may be as referenced... Figure 1 and Figure 2 Examples of the corresponding devices described (e.g., UE 115 or UE 215). Furthermore, process flow 400 may include one or more base stations 405, which may be referenced... Figure 1 and Figure 2 Examples of corresponding devices described herein. In some examples, the techniques described herein can support implicit indications of available time slots (e.g., implicit indications of available time slots in which aperiodic SRS will be transmitted, based on the interpretation of aperiodic resource triggering). The techniques described herein can also define MAC-CE payloads for updating, enabling, or disabling candidate available time slots (e.g., indicating entries in a table of available TTI sets configured in RRC messages). The techniques described herein can describe legacy-compatible SRS triggering and procedures for determining available TTIs based on DCI formats (e.g., formatting for scheduled DCI and for unscheduled DCI).

[0124] At 410, base station 405 may transmit a first RRC message. The first RRC message may include an indication of one or more available TTIs (e.g., time slots) for transmitting aperiodic SRS. The first RRC message may include parameters (e.g., AvailableSlotList) indicating one or more available TTIs. At 420, base station 405 may transmit a first DCI message that triggers aperiodic SRS and indicates available time slots from the available time slot list. For example, SRS triggering (e.g., the SRS request field in the first DCI message) may include code points indicating one or more SRS resource sets for transmitting aperiodic SRS. UE 415 may interpret the SRS request code points (e.g., two-bit SRS trigger) as indicating available TTIs from the available TTI list included in the first RRC message.

[0125] The first RRC message may include a table indicating various code points for an SRS request field (e.g., SRS triggering) included in a subsequent DCI (e.g., the first DCI). The SRS request field in DCI 420 may trigger the transmission of aperiodic SRS at 430, and the table indicated in the first RRC message may indicate the relationship between the different code points of the SRS request field in the DCI and their corresponding values ​​in the available slot list. In some examples, one or more RRC messages may configure a table indicating the correspondence between code points indicating SRS requests and one or more SRS resource sets configured to have a higher-level parameter aperiodicSRS-ResourceTrigger or aperiodicSRS-ResourceTriggerList.

[0126] In some examples, the first RRC message may indicate a set of multiple available TTIs for transmitting aperiodic SRS. In such examples, each entry in the list of available TTIs may be mapped to a corresponding SRS trigger code point (e.g., a trigger code point in the aperiodicSRS-ResourceTriggerList parameter). In some examples, the value of the list of available TTIs (e.g., the value of the AvailableSlotList parameter) may be equal to the number of values ​​established by another RRC parameter (e.g., the maximum value from 1 to aperiodicSRS0TriggerStates (aperiodic SRS0 trigger state)). Therefore, the number of available code points for the SRS request (e.g., based on the number of configuration values ​​for the aperiodicSRS-ResourceTriggerList parameter) may be equal to and mapped in a 1:1 ratio to the number of available slots indicated in the first RRC message. In such examples, a first code point (e.g., 01) may indicate a first available TTI (e.g., available slot 0), a second code point (e.g., 10) may indicate a second available TTI (e.g., available slot 1), and a third code point (e.g., 11) may indicate a third available TTI.

[0127] In some examples, the first RRC message may indicate a single value (e.g., indicating a single available TTI, or a reference TTI, etc.). If no value is indicated, the UE 415 may determine that the value is 0 (e.g., the time slot in which the UE 415 receives the DCI is a reference TTI from which the offset can be determined). For each value of the RRC parameter (e.g., for each SRS trigger code point), the UE 415 may determine the available time slots for transmitting aperiodic SRS based on the sum of the configured available TTI values ​​and the SRS trigger values. For example, for each SRS trigger code point, the UE 415 may identify the associated available TTI by adding different values ​​or offsets to the single value indicated in the first RRC message. For example, the first RRC message may indicate a single value k0 (e.g., the number of TTIs, the time offset in ms, etc.). For a first code point (e.g., 01), UE 415 may determine to initiate the transmission of an aperiodic SRS in a first available TTI (e.g., k0+1), for a second code point (e.g., 10), UE 415 may determine to initiate the transmission of an aperiodic SRS in a second available TTI (e.g., k0+2), and for a third code point (e.g., 11), UE 415 may determine to initiate the transmission of an aperiodic SRS in a third available TTI (e.g., k0+1).

[0128] In some examples, base station 405 may configure UE 415 to have one or more parameters (e.g., aperiodicSRS-ResourceTriggerList), but the number of values ​​for these parameters (e.g., trigger code points) may not be equal to the number of values ​​for available TTIs (e.g., AvailableSlotList) (e.g., length). In such examples, UE 415 may assume that the value of an available TTI (e.g., a single entry in AvailableSlotList if the list of available TTIs contains only a single value) will be used for each code point. Alternatively, UE 415 may assume that each value of an available TTI is associated with a code point, a code point plus an offset value, or both. For example, for a first code point (e.g., 01), UE 415 may determine a first available TTI (e.g., incremental offset 1), for a second code point (e.g., 10), UE 415 may determine a second available TTI (e.g., incremental offset 2), and for a third code point (e.g., 11), UE 415 may determine a third available TTI (e.g., incremental offset 3).

[0129] In some examples, different bits of the SRS trigger can indicate different information (e.g., bit splitting scheme). Base station 405 can limit the trigger value to only 2 (e.g., instead of 3). The list of available time slots can be similarly limited to only 2 values. One bit of the SRS trigger can indicate the value of the first configuration of the SRS resource set (e.g., the first value of the RRC parameter AperiodicSRS-ResourceTriggerList), etc. Another bit of the SRS trigger can indicate which of the two available TTIs will be used to transmit the triggered aperiodic SRS. For example, the first code point of the SRS trigger (e.g., 00) can indicate one or more SRS resource sets where AperiodicSRS-ResourceTrigger is set to 1, and the first available TTI is selected from the list of available TTIs. The second code point of the SRS trigger (e.g., 01) can indicate one or more SRS resource sets where AperiodicSRS-ResourceTrigger is set to 1, and the second available time slot is selected from the list of available time slots. The third code point (e.g., 10) for SRS triggering can indicate one or more SRS resource sets, where AperiodicSRS-ResourceTrigger is set to 2, and a first available time slot is selected from the list of available time slots. The fourth code point (e.g., 11) for SRS triggering can indicate one or more SRS resource sets, where AperiodicSRS-ResourceTrigger is set to 2, and a second available time slot is selected from the list of available time slots.

[0130] At 425, UE 415 may identify a first available TTI for transmitting the SRS triggered at 420. UE 415 may identify the first available TTI based on the techniques described herein. For example, UE 415 may identify an available TTI from the list of TTIs indicated in the first RRC message at 410, which is mapped to a code point triggered by the SRS received in the first DCI message at 420. Alternatively, UE 415 may identify a single available TTI indicated in the first RRC message at 410, and may apply an offset indicated by the code point triggered by the SRS to that single available TTI. Alternatively, UE 415 may utilize a bit splitting scheme or any other combination of RRC and DCI messages (as described herein) to identify the first available TTI from the list of available TTIs.

[0131] At 430, UE 415 may transmit aperiodic SRS on the SRS resource set indicated by the first DCI message in the available TTI identified by 425.

[0132] In some examples, base station 405 may dynamically update the available TTI, one or more code points (e.g., values ​​for the aperiodicSRS-ResourceTriggerList parameter), or any combination thereof indicated in the first RRC message. For example, in 435, base station 405 may transmit a control message to UE 415. The control message may be a MAC-CE, as referenced... Figure 5 In more detail, the MAC-CE payload may include commands for updating the list of available TTIs (e.g., entries in AvailableSlotList), available codepoints (e.g., entries in aperiodicSRS-ResourceTriggerList), or any combination thereof. The MAC-CE may include instructions to add entries to either list, remove entries from either list, activate or enable entries from either list, deactivate or disable entries from either list, or any combination thereof. In some examples, the MAC-CE may include an updated mapping of codepoints to available TTIs. Such a MAC-CE may include per-BWP update commands as described herein.

[0133] At 440, UE 415 may modify the mapping between code points and available TTIs (e.g., add, delete, enable, or disable one or more values, or adjust the mapping between previously configured values, or any combination thereof). At 445, base station 405 may transmit a second RRC message, which may include an updated list of available TTIs modified according to the control message at 435. At 450, base station 405 may transmit a second DCI that triggers the transmission of aperiodic SRS. UE 415 may identify the available TTIs in which aperiodic SRS is transmitted based on the second RRC message, the second DCI message, and the modified mapping performed at 440.

[0134] In some examples, UE 415 may determine whether to rely on additional procedures (e.g., legacy technology) to identify the available TTIs in which SRS is to be transmitted. For example, at 445, base station 405 may transmit a second RRC message. At 450, base station 405 may transmit, and UE 415 may receive, a second DCI message that triggers the transmission of aperiodic SRS at 470. At 455, UE 415 may determine whether one or more SRS configuration conditions are met, and may determine the available TTIs for transmitting SRS based on whether these conditions are met. For example, UE 415 may determine whether RRC parameters indicating a list of available TTIs (e.g., AvailableSlotList) are included in the second RRC message. If the RRC parameter is not present in the second RRC message 445, the UE 415 may consider that the condition is met and may suppress the determination of the available TTI based on such RRC parameters in combination with the implicit indication in the second DCI, and may instead rely on legacy SRS triggering (e.g., RRC parameters (such as the SlotOffset parameter) included in a previously received RRC message, or RRC parameters otherwise configured at the UE 415).

[0135] In some examples, considering that one or more conditions being met may include receiving an RRC message (e.g., at 445) indicating which SRS resource set level instruction to use for triggering technology. For example, such RRC parameters may be included in a first RRC message received at 410, and these RRC parameters may include instructions for UE 415 to identify a first available TTI based on the indication, as described in 420 and 425. Such RRC parameters may be included in a second RRC message received at 445, and may include instructions for UE 415 to identify a second available SRS TTI at 460 based on a configured offset value (e.g., based on the SlotOffset parameter value rather than relying on an implicit indication in the second DCI message).

[0136] In some examples, UE 415 may determine that the SRS configuration conditions are met based on the DCI format, CORESET, synchronization signal (SS) configuration, etc. For example, the first DCI format may be associated with the implicit indication described with reference to 420 and 425, the first radio access technology (RAT) (e.g., NR), etc., while the second DCI format may be associated with explicit signaling, the second RAT (e.g., LTE or other legacy systems), etc. The first DCI message may be of the first DCI format or may be associated with the first RAT, and the second DCI may be of the second DCI format or may be associated with the second RAT. If the second DCI is of the second DCI format or the second RAT, etc., UE 415 may consider the SRS configuration conditions to be met and may identify the second available TTI based on this. Similarly, the first CORESET may be associated with the implicit signaling of the available TTI, while the second CORESET may be associated with the explicit or legacy indication of the available TTI. Therefore, UE 415 can determine whether to rely on an implicit indication of the available TTI or switch to legacy behavior based on the CORESET associated with the second DCI message. In some examples, a first synchronization signal or synchronization signal block (SSB) may be associated with an implicit indication of the available TTI, while a second synchronization of the SSB may be associated with an explicit or legacy indication of the available TTI. Therefore, UE 415 can determine whether to rely on an implicit indication of the available TTI or switch to legacy behavior based on the synchronization signal or SSB associated with the second DCI message.

[0137] UE 415 may identify a second available TTI based on the determination that one, more, or all of the conditions described above are met. In 470, in such an example, UE 415 may transmit an aperiodic SRS triggered by a second DCI message during the second available TTI.

[0138] In some examples, UE 415 may identify the available TTIs for transmitting aperiodic SRS differently for different DCI format types. UE 415 may receive a second DCI message at 450, and the second DCI message may have a different format than the first DCI message. For example, the first DCI message may be a scheduled DCI, including scheduling information for data transmission on PUSCH or PDSCH, while the second DCI message may not schedule data transmission. Unscheduled DCIs may not adhere to the same size and bit limits as scheduled DCIs. In some examples, the second DCI message may include an explicit indication of the available TTIs for transmitting aperiodic SRS. However, UE 415 is also able to interpret the implicit indication of available TTIs based on a second RRC message (e.g., which may include a list of available TTIs) and the SRS triggers included in the second DCI message.

[0139] In some examples, UE 415 can determine the available TTI for transmitting SRS by prioritizing explicit indications over implicit indications. For example, the SRS trigger code point in the second DCI message may correspond to a third available TTI. The second DCI message may also include an explicit indication of the second available TTI. At 460, UE 415 may identify the second available TTI based on the explicit indication, and at 465, UE 415 may identify the third available TTI based on the SRS trigger code point and the second RRC message. UE 415 may determine to prioritize the explicit indication over the implicit indication and may transmit aperiodic SRS in the second available TTI based on this.

[0140] In some examples, base station 405 may configure UE 415 (e.g., via higher-layer signaling) to have two sets of possible values ​​(e.g., two tables). If the second DCI message does not include an explicit indication of an available TTI, UE 415 may rely on a first set of values. If the second DCI message does include an explicit indication of an available TTI, UE 415 may rely on a second set of values ​​to identify the available TTI. In some examples, the second list may be a subset of the first list, or vice versa. In some examples, a first bit of the SRS trigger code point may be designated for explicit indication, and a second bit of the SRS trigger code point may be designated for implicit indication. For example, a first bit set to 0 may explicitly indicate a first value, and a first bit set to 1 may explicitly indicate a second value. A second bit set to 0 may implicitly indicate a third value, and a second bit set to 1 may implicitly indicate a fourth value. Therefore, base station 405 may include instructions in the second DCI message to rely on explicit indication, in which case UE 415 may identify the second available TTI based on the first bit. If base station 405 does not include such an explicit indication in the second DCI message, UE 415 may rely solely on the first and second bits to identify the third available TTI. In some examples, two bits may be used to indicate four different available TTIs for an implicit indication, while one bit (e.g., the first bit) may be used to indicate only one of the two available TTIs for an explicit indication.

[0141] Figure 5 An example of a control message 500 triggered by a flexible, non-periodic probe reference signal, according to various aspects of this disclosure, is explained. The control message 500 can be transmitted by a base station and received by one or more UEs, and can be a reference... Figure 1 , 2 Examples of the corresponding devices described in 3 and 4. In some examples, control message 500 may be MAC-CE.

[0142] The MAC-CE may include one or more fields. For example, the MAC-CE may include a field for SRS resource set cell ID 505, indicating the cell ID used for aperiodic SRS. The MAC-CE may include a field for SRS resource set bandwidth portion (BWP) identifier 510, indicating the BWP used for aperiodic SRS. The MAC-CE may include a field for aperiodic SRS resource set identifier 515, indicating an aperiodic SRS resource set. Therefore, the MAC-CE can be used to update or modify one or more code points, one or more available TTIs, or both for a particular BWP. The MAC-CE may also include one or more reserved fields 520.

[0143] The MAC-CE may include one or more fields for updating, modifying, deleting available TTI values, or adding available TTI values ​​to the list of available TTIs. For example, field 535 may include the value of the first entry in the list of available slots (e.g., a new or modified value for AvailableSlotList Entry 0). Similarly, field 540 may include the value of the second entry in the list of available slots (e.g., a new or modified value for AvailableSlotList Entry 1). The MAC-CE may also include one or more fields for code points. Fields for code points may be associated with entries in the list of available TTIs, or may be modified. For example, field 525 may include the value of the first entry in the list of code point values ​​(e.g., a new or modified value for aperiodicSRS-ResourceTriggerList Entry 0). Similarly, field 530 may include the value of the second entry in the code point value list (e.g., a new or modified value for aperiodicSRS-ResourceTriggerList Entry 1). Therefore, MAC-CE may include updated, new, or modified values ​​for the first and second entries in the code point list, updated, new, or modified values ​​for the first and second entries in the available TTI list, or both. In some examples, MAC-CE may also include a function to delete one or more values ​​from the available TTI list or the code point list.

[0144] In some examples, the MAC-CE can enable or disable one or more entries in the list of available code points or the list of available TTIs. For example, the MAC-CE may include a bit map 545 corresponding to an entry in the list of available TTIs. If the list of available TTIs includes four entries, the bit map may include four bits (e.g., B0, B1, B2, and B3). These bits can indicate whether the corresponding entry in the list is enabled or disabled. For example, B0 may be set to 0 to indicate that the first entry is disabled, B1 may be set to 1 to indicate that the second entry is enabled, B2 may be set to 0 to indicate that the third entry is disabled, and B3 may be set to 0 to indicate that the fourth entry is disabled. Therefore, the MAC-CE can enable or disable one or more entries in the list of available TTIs.

[0145] Figure 6 Figure 600 illustrates a device 605 supporting flexible, non-periodic probe reference signal triggering according to various aspects of this disclosure. Device 605 may be an example of various aspects of UE 115 as described herein. Device 605 may include a receiver 610, a transmitter 615, and a communications manager 620. Device 605 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0146] Receiver 610 may provide means for receiving information, such as packets, user data, control information, or any combination thereof, associated with various information channels (e.g., control channels, data channels, information channels associated with flexible aperiodic probe reference signal triggering). The information may be transmitted to other components of device 605. Receiver 610 may utilize a single antenna or a collection of multiple antennas.

[0147] Transmitter 615 may provide means for transmitting signals generated by other components of device 605. For example, transmitter 615 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels associated with flexible aperiodic probe reference signal triggering). In some examples, transmitter 615 may be co-located with receiver 610 in a transceiver module. Transmitter 615 may utilize a single antenna or a collection of multiple antennas.

[0148] The communication manager 620, receiver 610, transmitter 615, or various combinations thereof, or various components thereof, may be examples of means for performing various aspects of the flexible, non-periodic probe reference signal triggering as described herein. For example, the communication manager 620, receiver 610, transmitter 615, or various combinations thereof, or components thereof, may support methods for performing one or more of the functions described herein.

[0149] In some examples, the communication manager 620, receiver 610, transmitter 615, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuitry system). This hardware may include a processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, configured to serve as or otherwise support means for performing the functions described herein. In some examples, the processor and memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in memory by the processor).

[0150] Additionally or alternatively, in some examples, the communication manager 620, receiver 610, transmitter 615, or various combinations or components thereof may be implemented by processor-executable code (e.g., as communication management software or firmware). If implemented by processor-executable code, the functionality of the communication manager 620, receiver 610, transmitter 615, or various combinations or components thereof may be performed by a general-purpose processor, DSP, central processing unit (CPU), ASIC, FPGA, or any combination of these or other programmable logic devices (e.g., means configured or otherwise supported for performing the functions described in this disclosure).

[0151] In some examples, the communication manager 620 may be configured to use or otherwise cooperate with the receiver 610, transmitter 615, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, the communication manager 620 may receive information from the receiver 610, send information to the transmitter 615, or be integrated with the receiver 610, transmitter 615, or both to receive information, transmit information, or perform various other operations described herein.

[0152] According to the examples disclosed herein, the communication manager 620 may support wireless communication at the UE. For example, the communication manager 620 may be configured or otherwise support means for: receiving a radio resource control message from a base station, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal. The communication manager 620 may be configured or otherwise support means for: receiving a first downlink control information message from a base station, the first downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a probe reference signal resource set. The communication manager 620 may be configured or otherwise support means for: transmitting one or more aperiodic probe reference signals to a base station on a probe reference signal resource set during a first available transmission time interval, wherein the transmission during the first available transmission time interval is based on a first code point of the first downlink control information message and the indication of the one or more available transmission time intervals.

[0153] By including or configuring a communication manager 620 according to the examples described herein, device 605 (e.g., a processor that controls or otherwise couples to receiver 610, transmitter 615, communication manager 620, or combinations thereof) can support techniques for aperiodic SRS triggering with added flexibility, resulting in increased system efficiency, efficient use of available resources, reduced system congestion, reduced system latency, etc. Additionally, such techniques can be implemented without sacrificing the size and efficiency of DCI signaling and decoding, or without increasing overhead.

[0154] Figure 7 Figure 700 illustrates a device 705 supported by flexible, non-periodic probe reference signal triggering according to various aspects of this disclosure. Device 705 may be an example of aspects of device 605 or UE 115 as described herein. Device 705 may include a receiver 710, a transmitter 715, and a communications manager 720. Device 705 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0155] Receiver 710 may provide means for receiving information, such as packets, user data, control information, or any combination thereof, associated with various information channels (e.g., control channels, data channels, information channels associated with flexible aperiodic probe reference signal triggering). The information may be transmitted to other components of device 705. Receiver 710 may utilize a single antenna or a collection of multiple antennas.

[0156] Transmitter 715 may provide means for transmitting signals generated by other components of device 705. For example, transmitter 715 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels associated with flexible aperiodic probe reference signal triggering). In some examples, transmitter 715 may be co-located with receiver 710 in a transceiver module. Transmitter 715 may utilize a single antenna or a collection of multiple antennas.

[0157] Device 705 or its various components may be examples of means for performing various aspects of flexible, non-periodic probe reference signal triggering as described herein. For example, communication manager 720 may include RRC message manager 725, DCI message manager 730, SRS transmission manager 735, or any combination thereof. Communication manager 720 may be examples of various aspects of communication manager 620 as described herein. In some examples, communication manager 720 or its various components may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using receiver 710, transmitter 715, or both, or otherwise in cooperation with receiver 710, transmitter 715, or both. For example, communication manager 720 may receive information from receiver 710, send information to transmitter 715, or be integrated in combination with receiver 710, transmitter 715, or both to receive information, transmit information, or perform various other operations described herein.

[0158] According to the examples disclosed herein, the communication manager 720 can support wireless communication at the UE. The RRC message manager 725 can be configured or otherwise supported to receive a radio resource control message from a base station, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal. The DCI message manager 725 can be configured or otherwise supported to receive a first downlink control information message from a base station, the first downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a probe reference signal resource set. The SRS transmission manager 735 can be configured or otherwise supported to transmit one or more aperiodic probe reference signals to a base station on a probe reference signal resource set during a first available transmission time interval, wherein the transmission during the first available transmission time interval is based on a first code point of the first downlink control information message and the indication of the one or more available transmission time intervals.

[0159] Figure 8Figure 800 illustrates a communication manager 820 supporting flexible aperiodic probe reference signal triggering according to various aspects of this disclosure. The communication manager 820 may be an example of aspects of the communication manager 620, communication manager 720, or both described herein. The communication manager 820 or its various components may be examples of means for performing various aspects of flexible aperiodic probe reference signal triggering as described herein. For example, the communication manager 820 may include an RRC message manager 825, a DCI message manager 830, an SRS transmission manager 835, a control message manager 840, an offset value manager 845, a slot offset value manager 850, an available TTI manager 855, a priority ordering manager 860, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0160] According to the examples disclosed herein, the communication manager 820 can support wireless communication at the UE. The RRC message manager 825 can be configured or otherwise supported to support means for receiving a radio resource control message from a base station, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal. The DCI message manager 830 can be configured or otherwise supported to support means for receiving a first downlink control information message from a base station, the first downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a probe reference signal resource set. The SRS transmission manager 835 can be configured or otherwise supported to support means for transmitting one or more aperiodic probe reference signals to a base station on a probe reference signal resource set during a first available transmission time interval, wherein the transmission during the first available transmission time interval is based on a first code point of the first downlink control information message and an indication of one or more available transmission time intervals.

[0161] In some examples, to support indication of one or more available transmission time intervals, the RRC message manager 825 may be configured or otherwise supported for transmitting an RRC message including an indication of a plurality of available transmission time intervals, each of the plurality of available transmission time intervals corresponding to a corresponding code point in a code point set including a first code point of a first downlink control information message.

[0162] In some respects, to support indication of one or more available transmission time intervals, the RRC message manager 825 may be configured or otherwise support means for transmitting an RRC message including an indication of a single available transmission time interval, wherein each offset value from the set of offset values ​​of the single available transmission time interval corresponds to a corresponding code point in the set of code points including a first code point of a first downlink control information message.

[0163] In some examples, the offset value manager 845 may be configured or otherwise support means for adding a first offset value from the offset value set to a single available transmission time interval, the first offset value corresponding to a first code point. In some examples, the offset value manager 845 may be configured or otherwise support means for identifying a first available transmission time interval based on the addition.

[0164] In some respects, in order to support indication of one or more available transmission time intervals, the RRC message manager 825 may be configured or otherwise support means for transmitting an RRC message including indication of a first available transmission time interval and a second available transmission time interval.

[0165] In some examples, the DCI message manager 830 may be configured or otherwise support means for receiving an aperiodic probe reference signal triggering in a first downlink control information message, including a first code point, wherein the first code point includes a first bit indicating the configuration of the first probe reference signal triggered by the aperiodic probe reference signal triggering and a second bit indicating a first available transmission time interval triggered by the aperiodic probe reference signal triggering.

[0166] In some examples, the control message manager 840 may be configured or otherwise support means for receiving control messages from a base station, the control messages including indications of one or more updated available transmission time intervals for transmitting an aperiodic probe reference signal, one or more updated values ​​of a code point set including a first code point, or any combination thereof.

[0167] In some examples, the control message includes a MAC control element (CE).

[0168] In some examples, the control message manager 840 may be configured or otherwise support means for transmitting MAC-CE messages, which include instructions for adding or removing one or more entries in a table indicating an available transmission time interval, or instructions for enabling or disabling one or more entries in a table indicating an available transmission time interval, or both.

[0169] In some examples, to support indication of one or more updated values ​​of a code point set, the control message manager 840 may be configured or otherwise support means for transmitting MAC-CE messages that include instructions for adding or removing one or more code points in the code point set, or instructions for enabling or disabling one or more code points in the code point set, or both.

[0170] In some examples, MAC-CE includes instructions for modifying the mapping between the code point set and the available transmission time interval.

[0171] In some examples, the RRC message manager 825 may be configured or otherwise support means for receiving a second radio resource control message from a base station, the second radio resource control message including a time slot offset value indicating a second available transmission time interval for transmitting an aperiodic probe reference signal. In some examples, the DCI message manager 830 may be configured or otherwise support means for receiving a second downlink control information message from a base station, the second downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a second probe reference signal resource set. In some examples, the SRS transmission manager 835 may be configured or otherwise support means for transmitting one or more aperiodic probe reference signals to a base station on a second probe reference signal resource set during a second available transmission time interval, wherein the transmission during the second available transmission time interval is based on determining that one or more probe reference signal configuration conditions are met.

[0172] In some examples, the RRC message manager 825 may be configured or otherwise support means for determining that a second radio resource control message does not include an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal, wherein the transmission of one or more aperiodic probe reference signals during the second available transmission time interval is based on that determination.

[0173] In some examples, the slot offset value manager 850 may be configured or otherwise support means for receiving, in a second radio resource control message, an instruction to use a slot offset value indicating a second available transmission time interval, wherein one or more aperiodic probe reference signals are transmitted during the second available transmission time interval based on the receipt of the instruction.

[0174] In some examples, the SRS transmission manager 835 may be configured or otherwise support means for: identifying the format of a second downlink control information message, a core resource set associated with the second downlink control information message, a synchronization signal associated with the second downlink control information message, or any combination thereof, wherein one or more aperiodic probe reference signals are transmitted based on the identification during a second available transmission time interval.

[0175] In some examples, the RRC message manager 825 may be configured or otherwise support means for receiving a second radio resource control message from a base station, the second radio resource control message including a second indication of one or more available transmission time intervals for transmitting aperiodic probe reference signals. In some examples, the DCI message manager 830 may be configured or otherwise support means for receiving a second downlink control information message from a base station, the second downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a second probe reference signal resource set, wherein the first downlink control information message is a scheduled downlink control information message, and the second downlink control information message is a non-scheduled downlink control information message including an indication of a second available transmission time interval. In some examples, the SRS transmission manager 835 may be configured or otherwise support means for transmitting one or more aperiodic probe reference signals to a base station on a second probe reference signal resource set during a second available transmission time interval, wherein the transmission during the second available transmission time interval is based on an indication of the second available transmission time interval.

[0176] In some examples, the available TTI manager 855 may be configured or otherwise supported to identify a third available transmission time interval based on a second code point of a second downlink control information message and a second indication of one or more available transmission time intervals. In some examples, the priority ordering manager 860 may be configured or otherwise supported to prioritize a second available transmission time interval based on the second downlink control information message being a non-scheduled downlink control information message.

[0177] In some examples, the DCI message manager 830 may be configured or otherwise support means for receiving an aperiodic probe reference signal triggering a second code point in a second downlink control information message, wherein the second code point includes a first bit indicating a second available transmission time interval for non-scheduled downlink control information messages triggered by the aperiodic probe reference signal triggering and a second bit indicating a third available transmission time interval for scheduled downlink control information messages triggered by the aperiodic probe reference signal triggering. In some examples, the priority ordering manager 860 may be configured or otherwise support means for prioritizing a second available transmission time interval based on the receipt of a second downlink control information message.

[0178] Figure 9 A diagram of a system 900 including a device 905 supporting flexible, non-periodic probe reference signal triggering, according to various aspects of this disclosure, is shown. Device 905 may be an example of device 605, device 705, or UE 115 as described herein, or a component including device 605, device 705, or UE 115. Device 905 may wirelessly communicate with one or more base stations 105, UE 115, or any combination thereof. Device 905 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 920, an input / output (I / O) controller 910, a transceiver 915, an antenna 925, a memory 930, a code 935, and a processor 940. These components may be in electronic communication or otherwise coupled (e.g., operational ground, communication ground, functional ground, electronic ground, electrical ground) via one or more buses (e.g., bus 945).

[0179] I / O controller 910 manages the input and output signals of device 905. I / O controller 910 can also manage peripheral devices not integrated into device 905. In some cases, I / O controller 910 may represent a physical connection or port to an external peripheral device. In some cases, I / O controller 910 may utilize an operating system, such as... Or another known operating system. Additionally or alternatively, the I / O controller 910 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, the I / O controller 910 may be implemented as part of a processor (such as processor 940). In some cases, a user may interact with device 905 via the I / O controller 910 or via hardware components controlled by the I / O controller 910.

[0180] In some cases, device 905 may include a single antenna 925. However, in other cases, device 905 may have more than one antenna 925, which may be capable of transmitting or receiving multiple wireless transmissions concurrently. Transceiver 915 may communicate bidirectionally via one or more antennas 925, wired or wireless links, as described herein. For example, transceiver 915 may represent a wireless transceiver and be capable of bidirectional communication with another wireless transceiver. Transceiver 915 may also include a modem for modulating packets and providing modulated packets to one or more antennas 925 for transmission, and for demodulating packets received from one or more antennas 925. Transceiver 915, or transceiver 915 and one or more antennas 925, may be an example of transmitter 615, transmitter 715, receiver 610, receiver 710, or any combination thereof or components thereof as described herein.

[0181] Memory 930 may include random access memory (RAM) and read-only memory (ROM). Memory 930 may store computer-readable, computer-executable code 935, including instructions that, when executed by processor 940, cause device 905 to perform the various functions described herein. Code 935 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, code 935 may not be directly executed by processor 940, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, memory 930 may, in particular, include a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0182] Processor 940 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 940 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 940. Processor 940 may be configured to execute computer-readable instructions stored in memory (e.g., memory 930) to cause device 905 to perform various functions (e.g., supporting various functions or tasks triggered by flexible, non-periodic probe reference signals). For example, device 905 or components thereof may include processor 940 and memory 930 coupled to processor 940, wherein processor 940 and memory 930 are configured to perform the various functions described herein.

[0183] According to the examples disclosed herein, the communication manager 920 may support wireless communication at the UE. For example, the communication manager 920 may be configured or otherwise support means for: receiving a radio resource control message from a base station, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal. The communication manager 920 may be configured or otherwise support means for: receiving a first downlink control information message from a base station, the first downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a probe reference signal resource set. The communication manager 920 may be configured or otherwise support means for: transmitting one or more aperiodic probe reference signals to a base station on a probe reference signal resource set during a first available transmission time interval, wherein the transmission during the first available transmission time interval is based on a first code point of the first downlink control information message and the indication of the one or more available transmission time intervals.

[0184] By including or configuring a communication manager 920 according to the examples described herein, device 905 can support techniques for aperiodic SRS triggering with added flexibility, resulting in increased system efficiency, efficient use of available resources, reduced system congestion, reduced system latency, etc. Additionally, such techniques can be implemented without sacrificing the size and efficiency of DCI signaling and decoding, or without increasing overhead.

[0185] In some examples, the communication manager 920 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise cooperating with the transceiver 915, one or more antennas 925, or any combination thereof. Although the communication manager 920 is described as a separate component, in some examples, one or more functions described with reference to the communication manager 920 may be supported or performed by the processor 940, memory 930, code 935, or any combination thereof. For example, code 935 may include instructions that can be executed by the processor 940 to cause the device 905 to perform various aspects of the flexible, non-periodic probe reference signal triggering as described herein, or the processor 940 and memory 930 may be otherwise configured to perform or support such operations.

[0186] Figure 10Figure 1000 illustrates a device 1005 supporting flexible, non-periodic probe reference signal triggering according to various aspects of this disclosure. Device 1005 may be an example of various aspects of base station 105 as described herein. Device 1005 may include a receiver 1010, a transmitter 1015, and a communication manager 1020. Device 1005 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0187] Receiver 1010 may provide means for receiving information, such as packets, user data, control information, or any combination thereof, associated with various information channels (e.g., control channels, data channels, information channels associated with flexible aperiodic probe reference signal triggering). The information may be transmitted to other components of device 1005. Receiver 1010 may utilize a single antenna or a collection of multiple antennas.

[0188] Transmitter 1015 may provide means for transmitting signals generated by other components of device 1005. For example, transmitter 1015 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels triggered by flexible aperiodic probe reference signals). In some examples, transmitter 1015 may be co-located with receiver 1010 in a transceiver module. Transmitter 1015 may utilize a single antenna or a collection of multiple antennas.

[0189] The communication manager 1020, receiver 1010, transmitter 1015, or various combinations thereof, or various components thereof, may be examples of means for performing various aspects of the flexible, non-periodic probe reference signal triggering as described herein. For example, the communication manager 1020, receiver 1010, transmitter 1015, or various combinations thereof, or components thereof, may support methods for performing one or more of the functions described herein.

[0190] In some examples, the communication manager 1020, receiver 1010, transmitter 1015, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuitry system). The hardware may include processors, DSPs, ASICs, FPGAs, or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination thereof, configured or otherwise supported for performing the functions described herein. In some examples, the processor and memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in memory by the processor).

[0191] Additionally or alternatively, in some examples, the communication manager 1020, receiver 1010, transmitter 1015, or various combinations or components thereof may be implemented by code executed by a processor (e.g., as communication management software or firmware). If implemented by code executed by a processor, the functionality of the communication manager 1020, receiver 1010, transmitter 1015, or various combinations or components thereof may be performed by a general-purpose processor, DSP, CPU, ASIC, FPGA, or any combination of these or other programmable logic devices (e.g., means configured or otherwise supported for performing the functions described in this disclosure).

[0192] In some examples, the communication manager 1020 may be configured to use or otherwise cooperate with the receiver 1010, transmitter 1015, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, the communication manager 1020 may receive information from the receiver 1010, send information to the transmitter 1015, or be integrated with the receiver 1010, transmitter 1015, or both to receive information, transmit information, or perform various other operations described herein.

[0193] According to the examples disclosed herein, the communication manager 1020 may support wireless communication at a base station. For example, the communication manager 1020 may be configured or otherwise support means for: transmitting a radio resource control message to a UE, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal. The communication manager 1020 may be configured or otherwise support means for: transmitting a first downlink control information message to a UE, the first downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a probe reference signal resource set. The communication manager 1020 may be configured or otherwise support means for: receiving one or more aperiodic probe reference signals from a UE on a probe reference signal resource set during a first available transmission time interval, wherein the reception during the first available transmission time interval is based on a first code point of the first downlink control information message and the indication of the one or more available transmission time intervals.

[0194] By including or configuring a communication manager 1020 according to the examples described herein, device 1005 (e.g., a processor that controls or is otherwise coupled to receiver 1010, transmitter 1015, communication manager 1020, or a combination thereof) can support techniques for aperiodic SRS triggering with added flexibility, resulting in increased system efficiency, efficient use of available resources, reduced system congestion, reduced system latency, etc. Additionally, such techniques can be implemented without sacrificing the size and efficiency of DCI signaling and decoding, or without increasing overhead.

[0195] Figure 11 Figure 1100 illustrates a device 1105 supporting flexible, non-periodic probe reference signal triggering according to aspects of this disclosure. Device 1105 may be an example of aspects of device 1005 or base station 105 as described herein. Device 1105 may include a receiver 1110, a transmitter 1115, and a communication manager 1120. Device 1105 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0196] Receiver 1110 may provide means for receiving information, such as packets, user data, control information, or any combination thereof, associated with various information channels (e.g., control channels, data channels, information channels associated with flexible aperiodic probe reference signal triggering). The information may be transmitted to other components of device 1105. Receiver 1110 may utilize a single antenna or a collection of multiple antennas.

[0197] Transmitter 1115 may provide means for transmitting signals generated by other components of device 1105. For example, transmitter 1115 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels associated with flexible aperiodic probe reference signal triggering). In some examples, transmitter 1115 may be co-located with receiver 1110 in a transceiver module. Transmitter 1115 may utilize a single antenna or a collection of multiple antennas.

[0198] Device 1105 or its various components may be examples of means for performing various aspects of flexible, non-periodic probe reference signal triggering as described herein. For example, communication manager 1120 may include RRC message manager 1125, DCI message manager 1130, SRS receiver manager 1135, or any combination thereof. Communication manager 1120 may be examples of various aspects of communication manager 1020 as described herein. In some examples, communication manager 1120 or its various components may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using receiver 1110, transmitter 1115, or both, or otherwise in cooperation with receiver 1010, transmitter 1015, or both. For example, communication manager 1120 may receive information from receiver 1110, send information to transmitter 1115, or be integrated with receiver 1110, transmitter 1115, or both to receive information, transmit information, or perform various other operations described herein.

[0199] According to the examples disclosed herein, the communication manager 1120 may support wireless communication at a base station. The RRC message manager 1125 may be configured or otherwise support means for transmitting a radio resource control message to the UE, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal. The DCI message manager 1130 may be configured or otherwise support means for transmitting a first downlink control information message to the UE, the first downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a probe reference signal resource set. The SRS receiver manager 1135 may be configured or otherwise support means for receiving one or more aperiodic probe reference signals from the UE on a probe reference signal resource set during a first available transmission time interval, wherein the reception during the first available transmission time interval is based on a first code point of the first downlink control information message and an indication of one or more available transmission time intervals.

[0200] Figure 12 Figure 1220 illustrates a communication manager 1200 supporting flexible aperiodic probe reference signal triggering according to various aspects of this disclosure. The communication manager 1220 may be an example of the communication manager 1020, communication manager 1120, or aspects thereof described herein. The communication manager 1220 or its various components may be examples of means for performing various aspects of flexible aperiodic probe reference signal triggering as described herein. For example, the communication manager 1220 may include an RRC message manager 1225, a DCI message manager 1230, an SRS receiver manager 1235, a control message manager 1240, an offset value manager 1245, an available TTI manager 1250, a priority ordering manager 1255, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0201] According to the examples disclosed herein, the communication manager 1220 may support wireless communication at a base station. The RRC message manager 1225 may be configured or otherwise support means for transmitting a radio resource control message to the UE, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal. The DCI message manager 1230 may be configured or otherwise support means for transmitting a first downlink control information message to the UE, the first downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a probe reference signal resource set. The SRS receiver manager 1235 may be configured or otherwise support means for receiving one or more aperiodic probe reference signals from the UE on a probe reference signal resource set during a first available transmission time interval, wherein the reception during the first available transmission time interval is based on a first code point of the first downlink control information message and an indication of one or more available transmission time intervals.

[0202] In some examples, to support indication of one or more available transmission time intervals, the RRC message manager 1225 may be configured or otherwise supported for transmitting an RRC message including an indication of a set of multiple available transmission time intervals, each of the multiple available transmission time intervals corresponding to a corresponding code point in a code point set including a first code point of a first downlink control information message.

[0203] In some examples, to support indication of one or more available transmission time intervals, the RRC message manager 1225 may be configured or otherwise support means for transmitting an RRC message including an indication of a single available transmission time interval, wherein each offset value from the set of offset values ​​of the single available transmission time interval corresponds to a corresponding code point in the set of code points including a first code point of a first downlink control information message.

[0204] In some examples, the offset value manager 1245 may be configured or otherwise supported as a means for adding a first offset value from the offset value set to a single available transmission time interval, the first offset value corresponding to a first code point. In some examples, the available TTI manager 1250 may be configured or otherwise supported as a means for identifying a first available transmission time interval based on the addition.

[0205] In some examples, to support indications of one or more available transmission time intervals, the RRC message manager 1225 may be configured or otherwise supported to transmit an RRC message including indications of a first available transmission time interval and a second available transmission time interval.

[0206] In some examples, the DCI message manager 1230 may be configured or otherwise support means for transmitting an aperiodic probe reference signal triggering, including a first code point, in a first downlink control information message, wherein the first code point includes a first bit indicating the configuration of the first probe reference signal and a second bit indicating a first available transmission time interval.

[0207] In some examples, the control message manager 1240 may be configured or otherwise support means for transmitting control messages to the UE, the control messages including indications of one or more updated available transmission time intervals for transmitting an aperiodic probe reference signal, one or more updated values ​​of a code point set including a first code point, or any combination thereof.

[0208] In some respects, control messages include MAC control elements (CEs).

[0209] In some examples, to support indication of one or more updated available transmission time intervals for transmitting aperiodic probe reference signals, the control message manager 1240 may be configured or otherwise support means for transmitting control messages that include instructions for adding or removing one or more entries in a table indicating available transmission time intervals, or instructions for enabling or disabling one or more entries in a table indicating available transmission time intervals, or both.

[0210] In some examples, to support indication of one or more updated values ​​of a codepoint set, the control message manager 1240 may be configured or otherwise support means for transmitting control messages that include instructions for adding or removing one or more codepoints in the codepoint set, or instructions for enabling or disabling one or more codepoints in the codepoint set, or both.

[0211] In some examples, MAC-CE includes instructions for modifying the mapping between the code point set and the available transmission time interval.

[0212] In some examples, the RRC message manager 1225 may be configured or otherwise support means for transmitting a second radio resource control message to the UE, the second radio resource control message including a time slot offset value indicating a second available transmission time interval for transmitting an aperiodic probe reference signal. In some examples, the DCI message manager 1230 may be configured or otherwise support means for transmitting a second downlink control information message to the UE, the second downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a second probe reference signal resource set. In some examples, the SRS receive manager 1235 may be configured or otherwise support means for receiving one or more aperiodic probe reference signals from the UE on a second probe reference signal resource set during a second available transmission time interval, wherein the reception during the second available transmission time interval is based on determining that one or more probe reference signal configuration conditions are met.

[0213] In some examples, the RRC message manager 1225 may be configured or otherwise support means for determining that a second radio resource control message does not include an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal, wherein receiving one or more aperiodic probe reference signals during the second available transmission time interval is based on that determination.

[0214] In some examples, the RRC message manager 1225 may be configured or otherwise supported to transmit instructions in a second radio resource control message for using a time slot offset value indicating a second available transmission time interval, wherein one or more aperiodic probe reference signals are received during the second available transmission time interval based on the transmission of the instructions.

[0215] In some examples, the SRS receiver manager 1235 may be configured or otherwise support means for: identifying the format of a second downlink control information message, a core resource set associated with the second downlink control information message, a synchronization signal associated with the second downlink control information message, or any combination thereof, wherein one or more aperiodic probe reference signals are received based on the identification during a second available transmission time interval.

[0216] In some examples, the RRC message manager 1225 may be configured or otherwise support means for transmitting a second radio resource control message to a base station, the second radio resource control message including a second indication of one or more available transmission time intervals for transmitting aperiodic probe reference signals. In some examples, the DCI message manager 1230 may be configured or otherwise support means for transmitting a second downlink control information message to a UE, the second downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a second probe reference signal resource set, wherein the first downlink control information message is a scheduled downlink control information message, and the second downlink control information message is a non-scheduled downlink control information message including an indication of a second available transmission time interval. In some examples, the SRS receive manager 1235 may be configured or otherwise support means for receiving one or more aperiodic probe reference signals from a UE on a second probe reference signal resource set during a second available transmission time interval, wherein the reception during the second available transmission time interval is based on an indication of the second available transmission time interval.

[0217] In some examples, the available TTI manager 1250 may be configured or otherwise supported to identify a third available transmission time interval based on a second code point of a second downlink control information message and a second indication of one or more available transmission time intervals. In some examples, the priority ordering manager 1255 may be configured or otherwise supported to prioritize a second available transmission time interval based on the second downlink control information message being a non-scheduled downlink control information message.

[0218] In some examples, the DCI message manager 1230 may be configured or otherwise support means for transmitting an aperiodic probe reference signal triggering, including a second code point, in a second downlink control information message. The second code point includes a first bit indicating a second available transmission time interval for non-scheduled downlink control information messages and a second bit indicating a third available transmission time interval for scheduled downlink control information messages. In some examples, the priority ordering manager 1255 may be configured or otherwise support means for prioritizing a second available transmission time interval based on the receipt of a second downlink control information message.

[0219] Figure 13A diagram of a system 1300 including a device 1305 supporting flexible, non-periodic probe reference signal triggering, according to various aspects of this disclosure, is shown. Device 1305 may be an example of device 1005, device 1105, or base station 105 as described herein, or a component including such devices. Device 1305 may wirelessly communicate with one or more base stations 105, UE 115, or any combination thereof. Device 1305 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communication manager 1320, a network communication manager 1310, a transceiver 1315, an antenna 1325, a memory 1330, code 1335, a processor 1340, and an inter-station communication manager 1345. These components may be in electronic communication or otherwise coupled (e.g., operational ground, communication ground, functional ground, electronic ground, electrical ground) via one or more buses (e.g., bus 1350).

[0220] The network communication manager 1310 can manage communication with the core network 130 (e.g., via one or more wired backhaul links). For example, the network communication manager 1310 can manage the delivery of data communication to client devices (such as one or more UEs 115).

[0221] In some cases, device 1305 may include a single antenna 1325. However, in other cases, device 1305 may have more than one antenna 1325, which may be capable of transmitting or receiving multiple wireless transmissions concurrently. Transceiver 1315 may communicate bidirectionally via one or more antennas 1325, wired or wireless links, as described herein. For example, transceiver 1315 may represent a wireless transceiver and be capable of bidirectional communication with another wireless transceiver. Transceiver 1315 may also include a modem for modulating packets and providing modulated packets to one or more antennas 1325 for transmission, and for demodulating packets received from one or more antennas 1325. Transceiver 1315, or transceiver 1315 and one or more antennas 1325, may be an example of transmitter 1015, transmitter 1115, receiver 1010, receiver 1110, or any combination thereof or components thereof as described herein.

[0222] Memory 1330 may include RAM and ROM. Memory 1330 may store computer-readable, computer-executable code 1335, including instructions that, when executed by processor 1340, cause device 1305 to perform the various functions described herein. Code 1335 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, code 1335 may not be directly executable by processor 1340, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, memory 1330 may, in particular, include a BIOS that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0223] Processor 1340 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1340 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 1340. Processor 1340 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1330) to cause device 1305 to perform various functions (e.g., supporting various functions or tasks triggered by flexible, non-periodic probe reference signals). For example, device 1305 or components thereof may include processor 1340 and memory 1330 coupled to processor 1340, wherein processor 1340 and memory 1330 are configured to perform the various functions described herein.

[0224] Inter-site communication manager 1345 manages communication with other base stations 105 and may include a controller or scheduler for cooperating with other base stations 105 to control communication with UE 115. For example, inter-site communication manager 1345 may coordinate the scheduling of transmissions to UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, inter-site communication manager 1345 may provide an X2 interface within LTE / LTE-A wireless communication network technology to facilitate communication between base stations 105.

[0225] According to the examples disclosed herein, the communication manager 1320 may support wireless communication at a base station. For example, the communication manager 1320 may be configured or otherwise support means for: transmitting a radio resource control message to a UE, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal. The communication manager 1320 may be configured or otherwise support means for: transmitting a first downlink control information message to a UE, the first downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a probe reference signal resource set. The communication manager 1320 may be configured or otherwise support means for: receiving one or more aperiodic probe reference signals from a UE on a probe reference signal resource set during a first available transmission time interval, wherein the reception during the first available transmission time interval is based on a first code point of the first downlink control information message and the indication of one or more available transmission time intervals.

[0226] By including or configuring the communication manager 1320 according to the examples described herein, device 1305 can support techniques for increasing system efficiency, efficient use of available resources, reduced system congestion, and reduced system latency resulting from aperiodic SRS triggering with additional flexibility. Additionally, such techniques can be implemented without sacrificing the size and efficiency of DCI signaling and decoding, or without increasing overhead.

[0227] In some examples, the communication manager 1320 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise cooperating with the transceiver 1315, one or more antennas 1325, or any combination thereof. Although the communication manager 1320 is described as a separate component, in some examples, one or more functions described with reference to the communication manager 1320 may be supported or executed by the processor 1340, memory 1330, code 1335, or any combination thereof. For example, code 1335 may include instructions that can be executed by the processor 1340 to cause the device 1305 to perform various aspects of the flexible, non-periodic probe reference signal triggering as described herein, or the processor 1340 and memory 1330 may be otherwise configured to perform or support such operations.

[0228] Figure 14 A flowchart illustrating a method 1400 for triggering a flexible, non-periodic probe reference signal according to various aspects of this disclosure is shown. Operation of method 1400 can be implemented by a UE or its components as described herein. For example, operation of method 1400 can be implemented by, as described in reference... Figures 1 to 9The UE 115 described herein is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described function.

[0229] At 1405, the method may include: receiving a radio resource control message from a base station, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal. Operation of 1405 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1405 may be provided by reference to... Figure 8 The described RRC message manager 825 is used to execute this.

[0230] In 1410, the method may include: receiving a first downlink control information message from a base station, the first downlink control information message triggering the transmission of one or more aperiodic breakthrough reference signals on a breakthrough reference signal resource set. The operation of 1410 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1410 may be determined by reference to... Figure 8 The described DCI message manager 830 is used to execute this.

[0231] In 1415, the method may include: transmitting one or more aperiodic breakthrough reference signals to a base station on a breakthrough reference signal resource set during a first available transmission time interval, wherein the transmission during the first available transmission time interval is based on a first code point of a first downlink control information message and an indication of one or more available transmission time intervals. Operation of 1415 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1415 may be provided by reference to... Figure 8 The SRS Transmission Manager 835 described is used to perform this.

[0232] Figure 15 A flowchart illustrating a method 1500 for triggering a flexible, non-periodic probe reference signal according to various aspects of this disclosure is shown. Operation of method 1500 can be implemented by a UE or its components as described herein. For example, operation of method 1500 can be implemented by, as described in reference... Figures 1 to 9 The UE 115 described herein is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described function.

[0233] At 1505, the method may include: receiving from a base station a radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal, the radio resource control message including indications of a plurality of available transmission time intervals for transmitting the aperiodic probe reference signal, wherein each of the plurality of available transmission time intervals corresponds to a corresponding code point in a set of code points including a first downlink control information message. Operation of 1505 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1505 may be provided by reference to... Figure 8 The described RRC message manager 825 is used to execute this.

[0234] In 1510, the method may include: receiving a first downlink control information message from a base station, the first downlink control information message triggering the transmission of one or more aperiodic breakthrough reference signals on a breakthrough reference signal resource set. The operation of 1510 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1510 may be determined by reference to... Figure 8 The described DCI message manager 830 is used to execute this.

[0235] In 1515, the method may include: transmitting one or more aperiodic probe reference signals to a base station on a probe reference signal resource set during a first available transmission time interval, wherein the transmission during the first available transmission time interval is at least partially based on a first code point of a first downlink control information message and an indication of one or more available transmission time intervals. Operation of 1515 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1515 may be provided by reference to... Figure 8 The SRS Transmission Manager 835 described is used to perform this.

[0236] Figure 16 A flowchart illustrating a method 1600 for triggering a flexible, non-periodic probe reference signal according to various aspects of this disclosure is shown. Operation of method 1600 can be implemented by a UE or its components as described herein. For example, operation of method 1600 can be implemented by, as described in reference... Figures 1 to 9 The UE 115 described herein is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described function.

[0237] At 1605, the method may include: receiving a radio resource control message from a base station, the radio resource control message including an indication of a single available transmission time interval for transmitting an aperiodic probe reference signal, wherein each offset value from a set of offset values ​​of the single available transmission time interval corresponds to a corresponding code point in a set of code points including a first code point of a first downlink control information message. Operation of 1605 may be performed according to the examples disclosed herein. In some examples, aspects of operation of 1605 may be provided by reference to... Figure 8 The described RRC message manager 825 is used to execute this.

[0238] In 1610, the method may include: receiving a first downlink control information message from a base station, the first downlink control information message triggering the transmission of one or more aperiodic breakthrough reference signals on a breakthrough reference signal resource set. Operation of 1610 may be performed according to the examples disclosed herein. In some examples, aspects of operation of 1610 may be referred to as follows. Figure 8 The described DCI message manager 830 is used to execute this.

[0239] In 1615, the method may include: adding a first downlink control information message from a base station, the first downlink control information message triggering the transmission of one or more aperiodic breakthrough reference signals on a breakthrough reference signal resource set. The operation of 1615 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1615 may be determined by reference to... Figure 8 The offset value manager 845 described is used to perform this.

[0240] In 1620, the method may include: identifying a first downlink control information message from a base station, the first downlink control information message triggering the transmission of one or more aperiodic breakthrough reference signals on a breakthrough reference signal resource set. The operation of 1620 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1620 may be determined by reference to... Figure 8 The offset value manager 845 described is used to perform this.

[0241] In 1625, the method may include: transmitting one or more aperiodic probe reference signals to a base station on a probe reference signal resource set during a first available transmission time interval, wherein the transmission during the first available transmission time interval is based on a first code point of a first downlink control information message and an indication of one or more available transmission time intervals. Operation of 1625 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1625 may be provided by reference to... Figure 8 The SRS Transmission Manager 835 described is used to perform this.

[0242] Figure 17 A flowchart illustrating a method 1700 for triggering a flexible, non-periodic probe reference signal according to various aspects of this disclosure is shown. Operation of method 1700 can be implemented by a UE or its components as described herein. For example, operation of method 1700 can be implemented by, as described in reference... Figures 1 to 9 The UE 115 described herein is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described function.

[0243] In 1705, the method may include: receiving a radio resource control message from a base station, the radio resource control message including indications of a first available transmission time interval and a second available transmission time interval for transmitting an aperiodic probe reference signal. Operation of 1705 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1705 may be provided by reference to... Figure 8 The described RRC message manager 825 is used to execute this.

[0244] In 1710, the method may include: receiving a first downlink control information message from a base station, the first downlink control information message triggering the transmission of one or more aperiodic breakthrough reference signals on a breakthrough reference signal resource set. Operation of 1710 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1710 may be determined by reference to... Figure 8 The described DCI message manager 830 is used to execute this.

[0245] In 1715, the method may include: receiving an aperiodic probe reference signal trigger including a first code point in a first downlink control information message, wherein the first code point includes a first bit indicating a first probe reference signal configuration and a second bit indicating a first available transmission time interval. Operation of 1715 may be performed according to the examples disclosed herein. In some examples, aspects of operation of 1715 may be provided by reference to... Figure 8 The described DCI message manager 830 is used to execute this.

[0246] In 1720, the method may include: transmitting one or more aperiodic probe reference signals to a base station on a probe reference signal resource set during a first available transmission time interval, wherein the transmission during the first available transmission time interval is at least partially based on a first code point of a first downlink control information message and an indication of one or more available transmission time intervals. Operation of 1720 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1720 may be provided by reference to... Figure 8The SRS Transmission Manager 835 described is used to perform this.

[0247] Figure 18 A flowchart illustrating a method 1800 for triggering a flexible, non-periodic probe reference signal according to various aspects of this disclosure is shown. Operation of method 1800 can be implemented by a base station or its components as described herein. For example, operation of method 1800 can be implemented by, as described in reference... Figures 1 to 5 and Figures 10 to 13 The described base station 105 performs this function. In some examples, the base station may execute a set of instructions to control the functional elements of the base station to perform the described function. Alternatively or additionally, the base station may use dedicated hardware to perform aspects of the described function.

[0248] At 1805, the method may include: transmitting a radio resource control message to the UE, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal. Operation of 1805 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1805 may be provided by reference to... Figure 12 The described RRC message manager 1225 is used for execution.

[0249] In 1810, the method may include: transmitting a first downlink control information message to the UE, the first downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a probe reference signal resource set. The operation of 1810 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1810 may be determined by reference to... Figure 12 The described DCI message manager 1230 is used to execute this.

[0250] In 1815, the method may include: receiving one or more aperiodic probe reference signals from the UE on a probe reference signal resource set during a first available transmission time interval, wherein the reception during the first available transmission time interval is based on a first code point of a first downlink control information message and an indication of one or more available transmission time intervals. Operation of 1815 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1815 may be provided by reference to... Figure 12 The SRS receiver manager 1235 described herein shall be used to perform this action.

[0251] The following provides an overview of the various aspects of this disclosure:

[0252] Aspect 1: A method for wireless communication at a UE, comprising: receiving a radio resource control message from a base station, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal; receiving a first downlink control information message from the base station, the first downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a probe reference signal resource set; and transmitting one or more aperiodic probe reference signals to the base station on the probe reference signal resource set during a first available transmission time interval, wherein the transmission during the first available transmission time interval is at least partially based on a first code point of the first downlink control information message and the indication of the one or more available transmission time intervals.

[0253] Aspect 2: The method of aspect 1, wherein the indication of one or more available transmission time intervals includes: the indication of a plurality of available transmission time intervals, each available transmission time interval in the set of available transmission time intervals corresponding to a corresponding code point in the set of code points including the first code point of the first downlink control information message.

[0254] Aspect 3: The method of any of Aspects 1 to 2, wherein the indication of one or more available transmission time intervals includes: the indication of a single available transmission time interval, wherein the set of offset values ​​from the single available transmission time interval corresponds to a corresponding code point in a set of code points including a first code point of the first downlink control information message.

[0255] Aspect 4: The method of aspect 3 further includes: adding a first offset value from the set of offset values ​​to a single available transmission time interval, the first offset value corresponding to a first code point; and identifying the first available transmission time interval at least in part based on the addition.

[0256] Aspect 5: The method of any of Aspects 1 to 4, wherein the indication of one or more available transmission time intervals includes: an indication of a first available transmission time interval and a second available transmission time interval.

[0257] Aspect 6: The method of aspect 5 further includes: receiving an aperiodic probe reference signal trigger including a first code point in a first downlink control information message, wherein the first code point includes a first bit indicating a first probe reference signal configuration and a second bit indicating a first available transmission time interval.

[0258] Aspect 7: The method of any of Aspects 1 to 6 further includes: receiving a control message from a base station, the control message including an indication of one or more updated available transmission time intervals for transmitting an aperiodic probe reference signal, one or more updated values ​​of a set of code points including a first code point, or any combination thereof.

[0259] Aspect 8: The method of aspect 7, wherein the control message includes a MAC control element (CE).

[0260] Aspect 9: The method of aspect 8, wherein the indication of one or more updated available transmission time intervals for transmitting aperiodic probe reference signals includes: instructions for adding or removing one or more entries in a table indicating available transmission time intervals, or instructions for enabling or disabling one or more entries in a table indicating available transmission time intervals, or both.

[0261] Aspect 10: The method of any of Aspects 8 to 9, wherein the indication of one or more updated values ​​of the code point set includes: instructions for adding or removing one or more code points in the code point set, or instructions for enabling or disabling one or more code points in the code point set, or both.

[0262] Aspect 11: The method of any of Aspects 8 to 10, wherein the MAC-CE includes instructions for modifying the mapping between the code point set and the available transmission time interval.

[0263] Aspect 12: The method of any of Aspects 1 to 11 further includes: receiving a second radio resource control message from a base station, the second radio resource control message including a time slot offset value indicating a second available transmission time interval for transmitting an aperiodic probe reference signal; receiving a second downlink control information message from the base station, the second downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a second probe reference signal resource set; and transmitting one or more aperiodic probe reference signals to the base station on the second probe reference signal resource set during the second available transmission time interval, wherein the transmission during the second available transmission time interval is at least partially based on determining that one or more probe reference signal configuration conditions are met.

[0264] Aspect 13: The method of aspect 12 further includes: determining that the second radio resource control message does not include an indication of one or more available transmission time intervals for transmitting aperiodic probe reference signals, wherein the transmission of one or more aperiodic probe reference signals during the second available transmission time interval is at least partially based on the determination.

[0265] Aspect 14: The method of any of Aspects 12 to 13 further includes: receiving in a second radio resource control message an instruction for using a time slot offset value indicating a second available transmission time interval, wherein one or more aperiodic probe reference signals are transmitted during the second available transmission time interval based at least in part on the receipt of the instruction.

[0266] Aspect 15: The method of any of Aspects 12 to 14 further includes: identifying the format of the second downlink control information message, the core resource set associated with the second downlink control information message, the synchronization signal associated with the second downlink control information message, or any combination thereof, wherein the transmission of one or more aperiodic probe reference signals during the second available transmission time interval is at least partially based on the identification.

[0267] Aspect 16: The method of any of Aspects 1 to 15 further includes: receiving from a base station a second radio resource control message, the second radio resource control message including a second indication of one or more available transmission time intervals for transmitting aperiodic probe reference signals; receiving from the base station a second downlink control information message, the second downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a second probe reference signal resource set, wherein the first downlink control information message is a scheduled downlink control information message, and the second downlink control information message is a non-scheduled downlink control information message including an indication of a second available transmission time interval; and transmitting one or more aperiodic probe reference signals to the base station on the second probe reference signal resource set during the second available transmission time interval, wherein the transmission during the second available transmission time interval is at least partially based on the indication of the second available transmission time interval.

[0268] Aspect 17: The method of aspect 16 further includes: identifying a third available transmission time interval based at least in part on a second code point of the second downlink control information message and a second indication of one or more available transmission time intervals; and prioritizing the second available transmission time interval based at least in part on the second downlink control information message being an unscheduled downlink control information message.

[0269] Aspect 18: The method of any of Aspects 16 to 17 further includes: receiving an aperiodic probe reference signal trigger including a second code point in a second downlink control information message, wherein the second code point includes a first bit of the aperiodic probe reference signal trigger indicating a second available transmission time interval for non-scheduling the downlink control information message and a second bit of the aperiodic probe reference signal trigger indicating a third available transmission time interval for scheduling the downlink control information message; and prioritizing the second available transmission time interval at least in part based on receiving the second downlink control information message.

[0270] Aspect 19: A method for wireless communication at a base station, comprising: transmitting a radio resource control message to a UE, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal; transmitting a first downlink control information message to the UE, the first downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a probe reference signal resource set; and receiving one or more aperiodic probe reference signals from the UE on the probe reference signal resource set during a first available transmission time interval, wherein the reception during the first available transmission time interval is at least partially based on a first code point of the first downlink control information message and the indication of one or more available transmission time intervals.

[0271] Aspect 20: The method of aspect 19, wherein the indication of one or more available transmission time intervals includes: the indication of a plurality of available transmission time intervals, each available transmission time interval in the set of available transmission time intervals corresponding to a corresponding code point in the set of code points including a first code point of the first downlink control information message.

[0272] Aspect 21: The method of any of Aspects 19 to 20, wherein the indication of one or more available transmission time intervals comprises: the indication of a single available transmission time interval, wherein the set of offset values ​​from the single available transmission time interval corresponds to a corresponding code point in a set of code points including a first code point of a first downlink control information message.

[0273] Aspect 22: The method of aspect 21 further includes: adding a first offset value from the set of offset values ​​to a single available transmission time interval, the first offset value corresponding to a first code point; and identifying the first available transmission time interval at least in part based on the addition.

[0274] Aspect 23: The method of any of Aspects 19 to 22, wherein the indication of one or more available transmission time intervals includes: an indication of a first available transmission time interval and a second available transmission time interval.

[0275] Aspect 24: The method of aspect 23 further includes: transmitting an aperiodic probe reference signal trigger including a first code point in a first downlink control information message, wherein the first code point includes a first bit indicating a first probe reference signal configuration of the aperiodic probe reference signal trigger and a second bit indicating a first available transmission time interval of the aperiodic probe reference signal trigger.

[0276] Aspect 25: The method of any of Aspects 19 to 24 further includes: transmitting a control message to the UE, the control message including an indication of one or more updated available transmission time intervals for transmitting an aperiodic probe reference signal, one or more updated values ​​of a set of code points including a first code point, or any combination thereof.

[0277] Aspect 26: The method of aspect 25, wherein the control message includes a MAC control element (CE).

[0278] Aspect 27: The method of aspect 26, wherein the indication of one or more updated available transmission time intervals for transmitting aperiodic probe reference signals includes: instructions for adding or removing one or more entries in a table indicating available transmission time intervals, or instructions for enabling or disabling one or more entries in a table indicating available transmission time intervals, or both.

[0279] Aspect 28: The method of any of Aspects 26 to 27, wherein the indication of one or more updated values ​​of the code point set includes: instructions for adding or removing one or more code points in the code point set, or instructions for enabling or disabling one or more code points in the code point set, or both.

[0280] Aspect 29: The method of any of Aspects 26 to 28, wherein the MAC-CE includes instructions for modifying the mapping between the code point set and the available transmission time interval.

[0281] Aspect 30: The method of any of Aspects 19 to 29 further includes: transmitting a second radio resource control message to the UE, the second radio resource control message including a time slot offset value indicating a second available transmission time interval for transmitting an aperiodic probe reference signal; transmitting a second downlink control information message to the UE, the second downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a second probe reference signal resource set; and receiving one or more aperiodic probe reference signals from the UE on the second probe reference signal resource set during the second available transmission time interval, wherein the reception during the second available transmission time interval is at least partially based on determining that one or more probe reference signal configuration conditions are met.

[0282] Aspect 31: The method of aspect 30 further includes: determining that the second radio resource control message does not include an indication of one or more available transmission time intervals for transmitting aperiodic probe reference signals, wherein receiving one or more aperiodic probe reference signals during the second available transmission time interval is at least partially based on the determination.

[0283] Aspect 32: The method of any of Aspects 30 to 31 further includes: transmitting in a second radio resource control message an instruction for using a time slot offset value indicating a second available transmission time interval, wherein receiving one or more aperiodic probe reference signals during the second available transmission time interval is at least partially based on transmitting the instruction.

[0284] Aspect 33: The method of any of Aspects 30 to 32 further includes: identifying the format of the second downlink control information message, the core resource set associated with the second downlink control information message, the synchronization signal associated with the second downlink control information message, or any combination thereof, wherein one or more aperiodic probe reference signals are received during a second available transmission time interval based at least in part on the identification.

[0285] Aspect 34: The method of any of Aspects 19 to 33 further includes: transmitting a second radio resource control message to a base station, the second radio resource control message including a second indication of one or more available transmission time intervals for transmitting aperiodic probe reference signals; transmitting a second downlink control information message to a UE, the second downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a second probe reference signal resource set, wherein the first downlink control information message is a scheduled downlink control information message, and the second downlink control information message is a non-scheduled downlink control information message including an indication of a second available transmission time interval; and receiving one or more aperiodic probe reference signals from the UE on the second probe reference signal resource set during the second available transmission time interval, wherein the reception during the second available transmission time interval is at least partially based on the indication of the second available transmission time interval.

[0286] Aspect 35: The method of aspect 34 further includes: identifying a third available transmission time interval based at least in part on a second code point of the second downlink control information message and a second indication of one or more available transmission time intervals; and prioritizing the second available transmission time interval based at least in part on the second downlink control information message being an unscheduled downlink control information message.

[0287] Aspect 36: The method of any of Aspects 34 to 35 further includes: transmitting an aperiodic probe reference signal trigger including a second code point in a second downlink control information message, wherein the second code point includes a first bit of the aperiodic probe reference signal trigger indicating a second available transmission time interval for non-scheduling the downlink control information message and a second bit of the aperiodic probe reference signal trigger indicating a third available transmission time interval for scheduling the downlink control information message; and prioritizing the second available transmission time interval at least in part based on receiving the second downlink control information message.

[0288] Aspect 37: An apparatus for wireless communication at a UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method as described in any of Aspects 1 to 18.

[0289] Aspect 38: An apparatus for wireless communication at a UE, comprising at least one means for performing the method of any one of Aspects 1 to 18.

[0290] Aspect 39: A non-transient computer-readable medium storing code for wireless communication at a UE, the code including instructions executable by a processor to perform methods as described in any of Aspects 1 to 18.

[0291] Aspect 40: An apparatus for wireless communication at a base station, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the methods of any one of Aspects 19 to 36.

[0292] Aspect 41: An apparatus for wireless communication at a base station, comprising at least one means for performing the method of any one of aspects 19 to 36.

[0293] Aspect 42: A non-transient computer-readable medium storing code for wireless communication at a base station, the code including instructions executable by a processor to perform methods as described in any of Aspects 19 to 36.

[0294] It should be noted that the methods described in this paper describe possible implementations, and the operations and steps can be rearranged or otherwise modified, and other implementations are also possible. Furthermore, aspects from two or more methods can be combined.

[0295] While aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used in most of the description, the techniques described herein can also be applied to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques can be applied to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0296] The information and signals described herein can be represented using any of a wide variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or light particles, or any combination thereof.

[0297] The various illustrative boxes and components described herein can be implemented or executed using a general-purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but in alternatives, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors working in conjunction with a DSP core, or any other such configuration).

[0298] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored or transmitted as one or more instructions or code on a computer-readable medium. Other examples and implementations fall within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Features implementing the functions may also be physically located in various locations, including being distributed such that different parts of the function are implemented at different physical locations.

[0299] Computer-readable media includes both non-transient computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one location to another. Non-transient storage media can be any available medium accessible to a general-purpose or special-purpose computer. By way of example and not limitation, non-transient computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, magnetic disk storage or other magnetic storage devices, or any other non-transient medium that can be used to carry or store desired program code in the form of instructions or data structures and is accessible to a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Similarly, any connection is also legitimately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then that coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable media. As used in this article, disk and disc include CDs, laser discs, optical discs, DVDs, floppy disks, and Blu-ray discs, where disks often magnetically reproduce data while discs optically reproduce data using lasers. Combinations of these media are also included within the scope of computer-readable media.

[0300] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored or transmitted as one or more instructions or code on a computer-readable medium. Other examples and implementations fall within the scope and spirit of this disclosure and the appended claims. For example, due to the nature of software, the above-described functions may be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Features implementing the functions may also be physically located in various locations, including being distributed such that the parts of the functions are implemented at different physical locations. As used herein (including in the claims), the term “and / or” in a list of two or more items means that any one of the listed items may be employed individually, or any combination of two or more listed items may be employed. For example, if a composition is described as comprising components A, B, and / or C, then the composition may comprise only A; only B; only C; a combination of A and B; a combination of A and C; a combination of B and C; or a combination of A, B, and C. Similarly, as used herein (including in the claims), the “or” used in an item enumeration (e.g., in an item enumeration followed by a phrase such as “at least one of” or “one or more of”) indicates a disjunctive enumeration such that an enumeration such as “at least one of A, B or C” means A or B or C or AB or AC or BC or ABC (i.e., A and B and C).

[0301] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, components of the same type may be distinguished by a dash following the reference numeral and a second reference numeral used to differentiate between similar components. If only the first reference numeral is used in the description, the description may apply to any of the similar components having the same first reference numeral, regardless of the second reference numeral or other subsequent reference numerals.

[0302] The descriptions herein, illustrated in conjunction with the accompanying drawings, depict exemplary configurations and do not represent all examples that can be implemented or fall within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration" and does not imply "superior" or "outperforming" other examples. This detailed description includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, known structures and devices are shown graphically to avoid obscuring the concepts of the described examples.

[0303] The description provided herein is intended to enable those skilled in the art to make or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the universal principles defined herein can be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for conducting wireless communication at a user equipment (UE), comprising: Receive a radio resource control message from a network node, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal, wherein the indication of the one or more available transmission time intervals includes: An indication of a single available transmission time interval, wherein each offset value from the set of offset values ​​of the single available transmission time interval corresponds to a corresponding code point in the set of code points including a first code point of a first downlink control information message; Receive a first downlink control information message from the network node, the first downlink control information message triggering the transmission of one or more aperiodic breakthrough reference signals on a breakthrough reference signal resource set; and During a first available transmission time interval, the one or more aperiodic probe reference signals are transmitted to the network node on the probe reference signal resource set, wherein the transmission during the first available transmission time interval is at least partially based on a first code point of the first downlink control information message and the indication of the one or more available transmission time intervals.

2. The method of claim 1, wherein the indication of the one or more available transmission time intervals comprises: The indication of multiple available transmission time intervals, each of which corresponds to a corresponding code point in the code point set of the first code point including the first downlink control information message.

3. The method of claim 1, further comprising: Add a first offset value from the set of offset values ​​to the single available transmission time interval, the first offset value corresponding to the first code point; as well as The first available transmission time interval is identified at least in part based on the addition.

4. The method of claim 1, further comprising: The network node receives a control message, which includes an indication of one or more updated available transmission time intervals for transmitting the aperiodic probe reference signal, one or more updated values ​​of the code point set including the first code point, or any combination thereof.

5. The method of claim 4, wherein the control message includes a Media Access Control (MAC) control element (CE).

6. The method of claim 5, wherein the indication of one or more updated available transmission time intervals for transmitting aperiodic probe reference signals comprises: Instructions for adding or removing one or more entries in a table indicating the available transmission time interval, or instructions for enabling or disabling one or more entries in a table indicating the available transmission time interval, or both.

7. The method of claim 5, wherein the indication of one or more updated values ​​of the codepoint set comprises: Instructions for adding or removing one or more code points from the code point set, or instructions for enabling or disabling one or more code points from the code point set, or both.

8. The method of claim 5, wherein the MAC-CE includes instructions for modifying the mapping between the code point set and the available transmission time interval.

9. The method of claim 1, further comprising: Receive a second radio resource control message from the network node, the second radio resource control message including a time slot offset value indicating a second available transmission time interval for transmitting an aperiodic probe reference signal; The network node receives a second downlink control information message, which triggers the transmission of one or more aperiodic breakthrough reference signals on a second breakthrough reference signal resource set. as well as During the second available transmission time interval, the one or more aperiodic breakthrough reference signals are transmitted to the network node on the second breakthrough reference signal resource set, wherein the transmission during the second available transmission time interval is at least in part based on determining that one or more breakthrough reference signal configuration conditions are met.

10. The method of claim 9, further comprising: The determination that the second radio resource control message does not include the indication of the one or more available transmission time intervals for transmitting aperiodic probe reference signals, wherein the transmission of the one or more aperiodic probe reference signals during the second available transmission time interval is at least in part based on the determination.

11. The method of claim 9, further comprising: The second radio resource control message receives an instruction for using the slot offset value indicating the second available transmission time interval, wherein the transmission of the one or more aperiodic probe reference signals during the second available transmission time interval is at least in part based on the receipt of the instruction.

12. The method of claim 9, further comprising: The identifier identifies the format of the second downlink control information message, the core resource set associated with the second downlink control information message, the synchronization signal associated with the second downlink control information message, or any combination thereof, wherein the transmission of the one or more aperiodic probe reference signals during the second available transmission time interval is at least partially based on the identifier.

13. The method of claim 1, further comprising: Receive a second radio resource control message from the network node, the second radio resource control message including a second indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal; The network node receives a second downlink control information message, which triggers the transmission of one or more aperiodic probe reference signals on a second probe reference signal resource set, wherein the first downlink control information message is a scheduled downlink control information message, and the second downlink control information message is a non-scheduled downlink control information message that includes an indication of a second available transmission time interval. as well as During the second available transmission time interval, the one or more aperiodic probe reference signals are transmitted to the network node on the second probe reference signal resource set, wherein the transmission during the second available transmission time interval is at least in part based on the indication of the second available transmission time interval.

14. The method of claim 13, further comprising: The third available transmission time interval is identified at least in part based on the second code point of the second downlink control information message and the second indication of the one or more available transmission time intervals; and Prioritizing the second available transmission time interval is based at least in part on the fact that the second downlink control information message is an unscheduled downlink control information message.

15. The method of claim 13, further comprising: The second downlink control information message receives an aperiodic probe reference signal trigger including a second code point, wherein the second code point includes a first bit indicating a second available transmission time interval for non-scheduled downlink control information messages and a second bit indicating a third available transmission time interval for scheduled downlink control information messages; and Prioritizing the second available transmission time interval is based at least in part on receiving the second downlink control information message.

16. The method of claim 1, wherein the indication of the one or more available transmission time intervals comprises: Indication of the first available transmission time interval and the second available transmission time interval.

17. The method of claim 16, further comprising: The first downlink control information message receives an aperiodic probe reference signal trigger including the first code point, wherein the first code point includes a first bit indicating the configuration of the first probe reference signal triggered by the aperiodic probe reference signal and a second bit indicating the first available transmission time interval triggered by the aperiodic probe reference signal.

18. A method for wireless communication at a network node, comprising: A radio resource control message is transmitted to the user equipment (UE), the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal, wherein the indication of the one or more available transmission time intervals includes: An indication of a single available transmission time interval, wherein each offset value from the set of offset values ​​of the single available transmission time interval corresponds to a corresponding code point in the set of code points including a first code point of a first downlink control information message; The first downlink control information message is transmitted to the UE, the first downlink control information message triggering the transmission of one or more aperiodic breakthrough reference signals on a breakthrough reference signal resource set; and During a first available transmission time interval, the UE receives one or more aperiodic probe reference signals on the probe reference signal resource set, wherein the reception during the first available transmission time interval is at least in part based on a first code point of the first downlink control information message and the indication of the one or more available transmission time intervals.

19. The method of claim 18, wherein the indication of the one or more available transmission time intervals comprises: The indication of multiple available transmission time intervals, each of which corresponds to a corresponding code point in the code point set of the first code point including the first downlink control information message.

20. The method of claim 18, further comprising: Add a first offset value from the set of offset values ​​to the single available transmission time interval, the first offset value corresponding to the first code point; as well as The first available transmission time interval is identified at least in part based on the addition.

21. The method of claim 18, further comprising: A second radio resource control message is transmitted to the UE, the second radio resource control message including a time slot offset value indicating a second available transmission time interval for transmitting an aperiodic probe reference signal; A second downlink control information message is transmitted to the UE, and the second downlink control information message triggers the transmission of one or more aperiodic breakthrough reference signals on a second breakthrough reference signal resource set; as well as During the second available transmission time interval, the UE receives the one or more aperiodic breakthrough reference signals on the second breakthrough reference signal resource set, wherein the reception during the second available transmission time interval is at least in part based on determining that one or more breakthrough reference signal configuration conditions are met.

22. The method of claim 21, further comprising: The determination that the second radio resource control message does not include the indication of one or more available transmission time intervals for transmitting aperiodic probe reference signals, wherein receiving the one or more aperiodic probe reference signals during the second available transmission time interval is at least in part based on the determination.

23. The method of claim 21, further comprising: The second radio resource control message transmits an instruction for using the slot offset value indicating the second available transmission time interval, wherein receiving the one or more aperiodic probe reference signals during the second available transmission time interval is at least in part based on transmitting the instruction.

24. The method of claim 21, further comprising: The identifier identifies the format of the second downlink control information message, the core resource set associated with the second downlink control information message, the synchronization signal associated with the second downlink control information message, or any combination thereof, wherein the reception of the one or more aperiodic probe reference signals during the second available transmission time interval is at least partially based on the identifier.

25. The method of claim 18, further comprising: A second radio resource control message is transmitted to the network node, the second radio resource control message including a second indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal; A second downlink control information message is transmitted to the UE, the second downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a second probe reference signal resource set, wherein the first downlink control information message is a scheduled downlink control information message, and the second downlink control information message is a non-scheduled downlink control information message including an indication of a second available transmission time interval; as well as During the second available transmission time interval, the UE receives one or more aperiodic probe reference signals on the second probe reference signal resource set, wherein the reception during the second available transmission time interval is at least in part based on the indication of the second available transmission time interval.

26. The method of claim 25, further comprising: The third available transmission time interval is identified at least in part based on the second code point of the second downlink control information message and the second indication of the one or more available transmission time intervals; and Prioritizing the second available transmission time interval is based at least in part on the fact that the second downlink control information message is an unscheduled downlink control information message.

27. An apparatus for conducting wireless communication at a user equipment (UE), comprising: processor; Memory coupled to the processor; as well as Instructions stored in the memory and executable by the processor to cause the device to perform the following operations: Receive a radio resource control message from a network node, the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal, wherein the indication of the one or more available transmission time intervals includes: An indication of a single available transmission time interval, wherein each offset value from the set of offset values ​​of the single available transmission time interval corresponds to a corresponding code point in the set of code points including a first code point of a first downlink control information message; Receive a first downlink control information message from the network node, the first downlink control information message triggering the transmission of one or more aperiodic breakthrough reference signals on a breakthrough reference signal resource set; and During a first available transmission time interval, the one or more aperiodic probe reference signals are transmitted to the network node on the probe reference signal resource set, wherein the transmission during the first available transmission time interval is at least partially based on a first code point of the first downlink control information message and the indication of the one or more available transmission time intervals.

28. The apparatus of claim 27, wherein the indication of the one or more available transmission time intervals comprises: The indication of multiple available transmission time intervals, each of which corresponds to a corresponding code point in the code point set of the first code point including the first downlink control information message.

29. The apparatus of claim 27, wherein the instructions are further executable by the processor to cause the apparatus to: Add a first offset value from the set of offset values ​​to the single available transmission time interval, the first offset value corresponding to the first code point; and The first available transmission time interval is identified at least in part based on the addition.

30. The apparatus of claim 27, wherein the instructions are further executable by the processor to cause the apparatus to: The network node receives a control message, which includes an indication of one or more updated available transmission time intervals for transmitting the aperiodic probe reference signal, one or more updated values ​​of the code point set including the first code point, or any combination thereof.

31. The apparatus of claim 30, wherein the control message includes a Media Access Control (MAC) control element (CE).

32. The apparatus of claim 31, wherein the indication of one or more updated available transmission time intervals for transmitting aperiodic probe reference signals comprises: Instructions for adding or removing one or more entries in a table indicating the available transmission time interval, or instructions for enabling or disabling one or more entries in a table indicating the available transmission time interval, or both.

33. The apparatus of claim 31, wherein the indication of one or more updated values ​​of the codepoint set comprises: Instructions for adding or removing one or more code points from the code point set, or instructions for enabling or disabling one or more code points from the code point set, or both.

34. The apparatus of claim 31, wherein the MAC-CE includes instructions for modifying the mapping between the code point set and the available transmission time interval.

35. The apparatus of claim 27, wherein the instructions are further executable by the processor to cause the apparatus to: Receive a second radio resource control message from the network node, the second radio resource control message including a time slot offset value indicating a second available transmission time interval for transmitting an aperiodic probe reference signal; Receive a second downlink control information message from the network node, the second downlink control information message triggering the transmission of one or more aperiodic breakthrough reference signals on a second breakthrough reference signal resource set; and During the second available transmission time interval, the one or more aperiodic breakthrough reference signals are transmitted to the network node on the second breakthrough reference signal resource set, wherein the transmission during the second available transmission time interval is at least in part based on determining that one or more breakthrough reference signal configuration conditions are met.

36. The apparatus of claim 35, wherein the instructions are further executable by the processor to cause the apparatus to: The determination that the second radio resource control message does not include the indication of the one or more available transmission time intervals for transmitting aperiodic probe reference signals, wherein the transmission of the one or more aperiodic probe reference signals during the second available transmission time interval is at least in part based on the determination.

37. The apparatus of claim 35, wherein the instructions are further executable by the processor to cause the apparatus to: The second radio resource control message receives an instruction for using the slot offset value indicating the second available transmission time interval, wherein the transmission of the one or more aperiodic probe reference signals during the second available transmission time interval is at least in part based on the receipt of the instruction.

38. The apparatus of claim 35, wherein the instructions are further executable by the processor to cause the apparatus to: The identifier identifies the format of the second downlink control information message, the core resource set associated with the second downlink control information message, the synchronization signal associated with the second downlink control information message, or any combination thereof, wherein the transmission of the one or more aperiodic probe reference signals during the second available transmission time interval is at least partially based on the identifier.

39. The apparatus of claim 27, wherein the instructions are further executable by the processor to cause the apparatus to: Receive a second radio resource control message from the network node, the second radio resource control message including a second indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal; The network node receives a second downlink control information message, which triggers the transmission of one or more aperiodic probe reference signals on a second probe reference signal resource set, wherein the first downlink control information message is a scheduled downlink control information message, and the second downlink control information message is a non-scheduled downlink control information message that includes an indication of a second available transmission time interval. as well as During the second available transmission time interval, the one or more aperiodic probe reference signals are transmitted to the network node on the second probe reference signal resource set, wherein the transmission during the second available transmission time interval is at least in part based on the indication of the second available transmission time interval.

40. The apparatus of claim 39, wherein the instructions are further executable by the processor to cause the apparatus to: The third available transmission time interval is identified at least in part based on the second code point of the second downlink control information message and the second indication of the one or more available transmission time intervals; and Prioritizing the second available transmission time interval is based at least in part on the fact that the second downlink control information message is an unscheduled downlink control information message.

41. The apparatus of claim 39, wherein the instructions are further executable by the processor to cause the apparatus to: The second downlink control information message receives an aperiodic probe reference signal trigger including a second code point, wherein the second code point includes a first bit indicating a second available transmission time interval for non-scheduled downlink control information messages and a second bit indicating a third available transmission time interval for scheduled downlink control information messages; and Prioritizing the second available transmission time interval is based at least in part on receiving the second downlink control information message.

42. The apparatus of claim 27, wherein the indication of the one or more available transmission time intervals comprises: Indication of the first available transmission time interval and the second available transmission time interval.

43. The apparatus of claim 42, wherein the instructions are further executable by the processor to cause the apparatus to: The first downlink control information message receives an aperiodic probe reference signal trigger including the first code point, wherein the first code point includes a first bit indicating the configuration of the first probe reference signal triggered by the aperiodic probe reference signal and a second bit indicating the first available transmission time interval triggered by the aperiodic probe reference signal.

44. An apparatus for wireless communication at a network node, comprising: processor; Memory coupled to the processor; as well as Instructions stored in the memory and executable by the processor to cause the device to perform the following operations: A radio resource control message is transmitted to the user equipment (UE), the radio resource control message including an indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal, wherein the indication of the one or more available transmission time intervals includes: An indication of a single available transmission time interval, wherein each offset value from the set of offset values ​​of the single available transmission time interval corresponds to a corresponding code point in the set of code points including a first code point of a first downlink control information message; A first downlink control information message is transmitted to the UE, and the first downlink control information message triggers the transmission of one or more aperiodic breakthrough reference signals on the breakthrough reference signal resource set; as well as During a first available transmission time interval, the UE receives one or more aperiodic probe reference signals on the probe reference signal resource set, wherein the reception during the first available transmission time interval is at least in part based on a first code point of the first downlink control information message and the indication of the one or more available transmission time intervals.

45. The apparatus of claim 44, wherein the indication of the one or more available transmission time intervals comprises: The indication of multiple available transmission time intervals, each of which corresponds to a corresponding code point in the code point set of the first code point including the first downlink control information message.

46. ​​The apparatus of claim 44, wherein the instructions are further executable by the processor to cause the apparatus to: Add a first offset value from the set of offset values ​​to the single available transmission time interval, the first offset value corresponding to the first code point; and The first available transmission time interval is identified at least in part based on the addition.

47. The apparatus of claim 44, wherein the instructions are further executable by the processor to cause the apparatus to: A second radio resource control message is transmitted to the UE, the second radio resource control message including a time slot offset value indicating a second available transmission time interval for transmitting an aperiodic probe reference signal; The UE is transmitted a second downlink control information message, which triggers the transmission of one or more aperiodic breakthrough reference signals on a second breakthrough reference signal resource set; and During the second available transmission time interval, the UE receives the one or more aperiodic breakthrough reference signals on the second breakthrough reference signal resource set, wherein the reception during the second available transmission time interval is at least in part based on determining that one or more breakthrough reference signal configuration conditions are met.

48. The apparatus of claim 47, wherein the instructions are further executable by the processor to cause the apparatus to: The determination that the second radio resource control message does not include the indication of one or more available transmission time intervals for transmitting aperiodic probe reference signals, wherein receiving the one or more aperiodic probe reference signals during the second available transmission time interval is at least in part based on the determination.

49. The apparatus of claim 47, wherein the instructions are further executable by the processor to cause the apparatus to: The second radio resource control message transmits an instruction for using the slot offset value indicating the second available transmission time interval, wherein receiving the one or more aperiodic probe reference signals during the second available transmission time interval is at least in part based on transmitting the instruction.

50. The apparatus of claim 47, wherein the instructions are further executable by the processor to cause the apparatus to: The identifier identifies the format of the second downlink control information message, the core resource set associated with the second downlink control information message, the synchronization signal associated with the second downlink control information message, or any combination thereof, wherein the reception of the one or more aperiodic probe reference signals during the second available transmission time interval is at least partially based on the identifier.

51. The apparatus of claim 44, wherein the instructions are further executable by the processor to cause the apparatus to: A second radio resource control message is transmitted to the network node, the second radio resource control message including a second indication of one or more available transmission time intervals for transmitting an aperiodic probe reference signal; A second downlink control information message is transmitted to the UE, the second downlink control information message triggering the transmission of one or more aperiodic probe reference signals on a second probe reference signal resource set, wherein the first downlink control information message is a scheduled downlink control information message, and the second downlink control information message is a non-scheduled downlink control information message including an indication of a second available transmission time interval; as well as During the second available transmission time interval, the UE receives one or more aperiodic probe reference signals on the second probe reference signal resource set, wherein the reception during the second available transmission time interval is at least in part based on the indication of the second available transmission time interval.

52. The apparatus of claim 51, wherein the instructions are further executable by the processor to cause the apparatus to: The third available transmission time interval is identified at least in part based on the second code point of the second downlink control information message and the second indication of the one or more available transmission time intervals; and Prioritizing the second available transmission time interval is based at least in part on the fact that the second downlink control information message is an unscheduled downlink control information message.

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