Techniques for sounding reference signal phase coherence

Abstract

Methods, systems, and apparatus for wireless communication are described. A user equipment (UE) can be configured to receive from a base station an indication of a resource set for transmitting a set of phase-coherent probe reference signals (SRS). The UE can receive from the base station a control message indicating cancellation of an allocation of a first portion of the resource set. The UE can determine a phase-coherence configuration associated with a second portion of the resource set based on the received control message indicating the cancellation. The UE can then be configured to transmit one or more SRSs within the second portion of the resource set according to the determined phase-coherence configuration.

Description

[0001] Cross-referencing

[0002] This patent application claims priority to Greek patent application No. 20200100692 entitled “TECHNIQUESFOR SOUNDING REFERENCE SIGNAL PHASE COHERENCY”, filed on November 20, 2020 by ABDELGHAFFAR et al., which has been assigned to the assignee of this application. Technical Field

[0003] The following relates to wireless communication, including techniques for probing the phase coherence of the reference signal (SRS).

[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).

[0006] In some wireless communication systems, a base station can perform channel estimation of the wireless channel between itself and the UE based on a detection reference signal (SRS) received from the UE. The base station can allocate resource sets for the UE to transmit SRS. These resource sets can be contiguous in the time and / or frequency domains, allowing the UE to transmit a set of phase-coherent SRSs within that resource set (i.e., each SRS transmission uses the same phase). However, conventional phase-coherence techniques have limitations.

[0007] Overview

[0008] The described techniques relate to improved methods, systems, devices, or apparatuses (equipment) supporting techniques for probing the phase coherence of Signal-Reference (SRS). Generally, this disclosure relates to techniques for determining the phase coherence behavior of a User Equipment (UE) for SRS transmission when a portion of an allocated SRS resource set is cancelled, resulting in a time or frequency gap within the allocated SRS resource set. Specifically, the techniques described herein can enable SRS transmissions with varying degrees of phase coherence in situations where at least a portion of the SRS resources within a bundled SRS resource set has been cancelled or released. For example, a base station can allocate a resource set that the UE can use to transmit a set of phase-coherent SRS. Subsequently, the base station can transmit a control message (e.g., Uplink Cancellation Information (ULCI)) that cancels the allocation of at least a portion of the resource set available for SRS transmission. In this example, the UE can be configured to determine the phase coherence configuration that the UE will apply to the uncancelled SRS resources and can transmit one or more SRSs within the uncancelled SRS resources according to the determined phase coherence configuration.

[0009] A method for wireless communication at a UE is described. The method may include: receiving from a base station an indication of a resource set for transmitting a plurality of phase-coherent SRSs; receiving from the base station a control message indicating cancellation of an allocation of a first portion of the resource set; determining a phase-coherence configuration associated with a second portion of the resource set based on the received control message indicating cancellation; and transmitting one or more SRSs within the second portion of the resource set according to the determined phase-coherence configuration.

[0010] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. These instructions may be executed by the processor to cause the apparatus to: receive from a base station an indication of a resource set for transmitting a plurality of phase-coherent SRSs; receive from the base station a control message indicating cancellation of the allocation of a first portion of the resource set; determine a phase-coherence configuration associated with a second portion of the resource set based on the received control message indicating cancellation; and transmit one or more SRSs within the second portion of the resource set according to the determined phase-coherence configuration.

[0011] Another apparatus for wireless communication at a UE is described. The apparatus may include: means for receiving from a base station an indication of a resource set for transmitting a plurality of phase-coherent SRSs; means for receiving from the base station a control message indicating cancellation of the allocation of a first portion of the resource set; means for determining a phase-coherence configuration associated with a second portion of the resource set based on the received control message indicating cancellation; and means for transmitting one or more SRSs within the second portion of the resource set according to the determined phase-coherence configuration.

[0012] A non-transient computer-readable medium is described, storing code for wireless communication at a UE. The code may include instructions executable by a processor to: receive from a base station an indication of a resource set for transmitting a plurality of phase-coherent SRSs; receive from the base station a control message indicating cancellation of an allocation of a first portion of the resource set; determine a phase-coherence configuration associated with a second portion of the resource set based on the received control message indicating cancellation; and transmit one or more SRSs within the second portion of the resource set according to the determined phase-coherence configuration.

[0013] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, transmitting one or more SRSs within the second part of the resource set may include operations, features, means, or instructions for transmitting a first set of phase-coherent SRSs and transmitting a second set of phase-coherent SRSs different from the first set of phase-coherent SRSs.

[0014] 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 a first phase-coherent SRS set in the time domain before the first portion of the resource set associated with cancellation, and transmitting a second phase-coherent SRS set in the time domain after the first portion of the resource set associated with cancellation.

[0015] 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 a first phase coherent SRS set associated with a first phase and transmitting a second phase coherent SRS set associated with a second phase different from the first phase.

[0016] In some examples of the methods, apparatus (devices) and nontransient computer-readable media described herein, transmitting one or more SRSs within a second portion of the resource set may include operations, features, means, or instructions for transmitting a first set of SRSs and a second set of SRSs different from the first set of SRSs with shared phase coherence based on a time interval of a first portion of the resource set associated with the cancellation satisfying a time interval threshold.

[0017] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the time interval of the first portion of the resource set associated with the cancellation satisfies the time interval threshold if the time interval is less than the time interval threshold.

[0018] 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 control message from the base station that includes an indication of a threshold for the time interval, wherein the transmission of the first SRS set and the second SRS set with shared phase coherence may be based on the receipt of the second control message.

[0019] 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 a first SRS set and a second SRS set different from the first SRS set using the shared phase coherence, based on uplink transmissions within a first portion of the schedule associated with the cancellation that identify the absence of the resource set.

[0020] In some examples of the methods, apparatus (devices) and nontransient computer-readable media described herein, transmitting one or more SRSs within a second portion of the resource set may include operations, features, means, or instructions for transmitting a first set of SRSs and a second set of SRSs different from the first set of SRSs using shared phase coherence, based on uplink transmissions scheduled within the first portion associated with the cancellation that identify the absence of the resource set.

[0021] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the set of multiple phase-coherent SRSs may include operations, features, means, or instructions for acting as: a first set of SRSs associated with a first component carrier and a second set of SRSs associated with a second component carrier, wherein the first and second sets of SRSs may be associated with shared phase coherence.

[0022] In some examples of the methods, apparatus (devices) and nontransient computer-readable media described herein, transmitting the one or more SRSs may include operations, features, means or instructions for: based on the fact that a first portion of the resource set associated with the cancellation is located within a second SRS set, transmitting at least a subset of the first SRS set with a first phase, and transmitting at least a subset of the second SRS set with a second phase different from the first phase.

[0023] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the first component carrier and the second component carrier comprise a set of frequency-adjacent component carriers.

[0024] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the set of multiple phase-coherent SRSs further includes a third set of SRSs associated with a third component carrier, and the third set of SRSs may be associated with the shared phase coherence associated with the first set of SRSs and the second set of SRSs.

[0025] In some examples of the methods, apparatus (devices) and nontransient computer-readable media described herein, transmitting the one or more SRSs may include operations, features, means or instructions for: based on a first portion of the resource set associated with the cancellation being located within a second SRS set, transmitting at least a subset of the first SRS set with a first phase, and transmitting at least a subset of the third SRS set with a second phase different from the first phase.

[0026] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, transmitting one or more SRSs within a second portion of the resource set may include operations, features, means, or instructions for: transmitting a first-phase coherent SRS set with a first phase and transmitting a second-phase coherent SRS set with a second phase different from the first phase, wherein the phase difference between the first phase and the second phase satisfies a phase threshold.

[0027] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the phase difference between the first phase and the second phase satisfies the phase threshold if the phase difference can be less than the phase threshold.

[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 transmitting a UE capability report to the base station that includes an indication of the phase threshold, wherein transmitting a first phase coherent SRS set and a second phase coherent SRS set may be based on transmitting the UE capability report.

[0029] 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 a UE capability report to the base station, the UE capability report including indications of one or more phase coherence configurations supported by the UE, wherein the transmission of the one or more SRS may be based on the transmission of the UE capability report.

[0030] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the control message includes a ULCI message.

[0031] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the first portion of the resource set associated with the cancellation is associated with a Time Division Orthogonal Cover Code (TD-OCC), and transmitting the one or more SRSs may include operations, features, means, or instructions for transmitting the one or more SRSs based on the fact that the one or more SRSs are not associated with a TD-OCC.

[0032] In some examples of the methods, apparatus (devices) and nontransient computer-readable media described herein, and in particular, the methods, apparatus (devices) and nontransient computer-readable media may include further operations, features, means or instructions for suppressing the transmission of one or more additional SRS associated with TD-OCC based on one or more additional SRS associated with a second part of the resource set.

[0033] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the collection of multiple phase-coherent SRSs includes periodic SRSs, semi-periodic SRSs, aperiodic SRSs, or any combination thereof.

[0034] Examples of methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for receiving unicast downlink control information (DCI) messages, group shared DCI messages or both from the base station, wherein an indication of the resource set for transmitting the set of the plurality of phase-coherent SRSs may be received via the unicast DCI message, the group shared DCI message or both.

[0035] A method for wireless communication at a base station is described. The method may include: transmitting to a UE an indication of a resource set for transmitting a set of multiple phase-coherent SRSs; transmitting to the UE a control message indicating cancellation of the allocation of a first portion of the resource set; determining a phase-coherence configuration associated with a second portion of the resource set based on the control message indicating cancellation; and receiving one or more SRSs from the UE within the second portion of the resource set according to the determined phase-coherence configuration.

[0036] 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 may be executed by the processor to cause the apparatus to: transmit to a UE an indication of a resource set for transmitting a plurality of phase-coherent SRSs; transmit to the UE a control message indicating cancellation of the allocation of a first portion of the resource set; determine a phase-coherence configuration associated with a second portion of the resource set based on the control message indicating cancellation; and receive one or more SRSs from the UE within the second portion of the resource set according to the determined phase-coherence configuration.

[0037] Another apparatus for wireless communication at a base station is described. The apparatus may include: means for transmitting to a UE an indication of a resource set for transmitting a set of multiple phase-coherent SRSs; means for transmitting to the UE a control message indicating cancellation of the allocation of a first portion of the resource set; means for determining a phase-coherence configuration associated with a second portion of the resource set based on the control message indicating cancellation; and means for receiving one or more SRSs from the UE within the second portion of the resource set according to the determined phase-coherence configuration.

[0038] A non-transient computer-readable medium is described, storing code for wireless communication at a base station. The code may include instructions executable by a processor to: transmit to a UE an indication of a resource set for transmitting a set of multiple phase-coherent SRSs; transmit to the UE a control message indicating cancellation of the allocation of a first portion of the resource set; determine a phase-coherence configuration associated with a second portion of the resource set based on the control message indicating cancellation; and receive one or more SRSs from the UE within the second portion of the resource set according to the determined phase-coherence configuration.

[0039] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, receiving one or more SRSs within a second portion of the resource set may include operations, features, means, or instructions for receiving a first set of phase-coherent SRSs and receiving a second set of phase-coherent SRSs different from the first set of phase-coherent SRSs.

[0040] 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 first phase-coherent SRS set in the time domain before the first portion of the resource set associated with cancellation, and receiving a second phase-coherent SRS set in the time domain after the first portion of the resource set associated with cancellation.

[0041] 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 first phase coherent SRS set associated with a first phase and receiving a second phase coherent SRS set associated with a second phase different from the first phase.

[0042] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, receiving one or more SRSs within a second portion of the resource set may include operations, features, means, or instructions for receiving a first set of SRSs and a second set of SRSs different from the first set of SRSs with shared phase coherence, based on a time interval of a first portion of the resource set associated with the cancellation satisfying a time interval threshold.

[0043] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the time interval of the first portion of the resource set associated with the cancellation satisfies the time interval threshold if the time interval is less than the time interval threshold.

[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 transmitting a second control message to the UE including an indication of a threshold for the time interval, wherein receiving the first SRS set and the second SRS set with the shared phase coherence may be based on transmitting the second control message.

[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 receiving a first SRS set and a second SRS set different from the first SRS set using the shared phase coherence, based on an uplink transmission within a first portion of the schedule associated with the cancellation that identifies the absence of the resource set.

[0046] In some examples of the methods, apparatus (devices) and nontransient computer-readable media described herein, receiving one or more SRSs within a second portion of the resource set may include operations, features, means, or instructions for receiving a first set of SRSs and a second set of SRSs different from the first set of SRSs with shared phase coherence based on uplink transmissions scheduled within the first portion associated with the cancellation that identify the absence of the resource set.

[0047] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the set of multiple phase-coherent SRSs may include operations, features, means, or instructions for acting as: a first set of SRSs associated with a first component carrier and a second set of SRSs associated with a second component carrier, wherein the first and second sets of SRSs may be associated with shared phase coherence.

[0048] In some examples of the methods, apparatus (devices) and nontransient computer-readable media described herein, receiving the one or more SRSs may include operations, features, means or instructions for: receiving at least one subset of the first SRS set with a first phase based on a first portion of the resource set associated with the cancellation being located within a second SRS set, and receiving at least one subset of the second SRS set with a second phase different from the first phase.

[0049] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the first component carrier and the second component carrier comprise a set of frequency-adjacent component carriers.

[0050] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the set of multiple phase-coherent SRSs further includes a third set of SRSs associated with a third component carrier, and the third set of SRSs may be associated with the shared phase coherence associated with the first set of SRSs and the second set of SRSs.

[0051] In some examples of the methods, apparatus (devices) and nontransient computer-readable media described herein, receiving the one or more SRSs may include operations, features, means or instructions for: receiving at least one subset of the first SRS set with a first phase based on a first portion of the resource set associated with the cancellation being located within a second SRS set, and receiving at least one subset of the third SRS set with a second phase different from the first phase.

[0052] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, receiving the one or more SRSs within a second portion of the resource set may include operations, features, means, or instructions for: receiving a first-phase coherent SRS set with a first phase and receiving a second-phase coherent SRS set with a second phase different from the first phase, wherein the phase difference between the first phase and the second phase satisfies a phase threshold.

[0053] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the phase difference between the first phase and the second phase satisfies the phase threshold if the phase difference can be less than the phase threshold.

[0054] 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 UE capability report from the UE that includes an indication of the phase threshold, wherein receiving a first phase coherent SRS set and a second phase coherent SRS set may be based on receiving the UE capability report.

[0055] 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 UE capability report from the UE, the UE capability report including indications of one or more phase coherence configurations supported by the UE, wherein receiving the one or more SRS may be based on receiving the UE capability report.

[0056] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the control message includes a ULCI message.

[0057] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, receiving the one or more SRS may include operations, features, means or instructions for receiving the one or more SRS based on the fact that the one or more SRS is not associated with TD-OCC.

[0058] In some examples of the methods, apparatus (devices) and nontransient computer-readable media described herein, and in particular, the methods, apparatus (devices) and nontransient computer-readable media may include further operations, features, means or instructions for suppressing reception of one or more additional SRS associated with TD-OCC based on one or more additional SRS associated with a second part of the resource set.

[0059] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the collection of multiple phase-coherent SRSs includes periodic SRSs, semi-periodic SRSs, aperiodic SRSs, or any combination thereof.

[0060] 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 a unicast DCI message, a group shared DCI message, or both to the UE, wherein an indication of the resource set for transmitting the set of the plurality of phase-coherent SRSs may be transmitted via the unicast DCI message, the group shared DCI message or both.

[0061] 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 a channel estimate associated with the channel between the UE and the base station based on the receipt of the one or more SRS.

[0062] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, receiving the one or more SRSs within a second portion of the resource set may include operations, features, means, or instructions for: receiving a first set of phase-coherent SRSs and receiving a second set of phase-coherent SRSs different from the first set of phase-coherent SRSs, wherein determining the channel estimate may be based on the first set of phase-coherent SRSs, the second set of phase-coherent SRSs, or both.

[0063] Examples of methods, apparatus (devices), and non-transient computer-readable media described herein may further include operations, features, means, or instructions for receiving uplink transmissions from the UE and demodulating the uplink transmissions based on determined channel estimates.

[0064] Examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for: determining a precoder associated with downlink transmission based on a determined channel estimate, and transmitting downlink transmission to the UE based on the determined precoder. Brief description of the attached diagram

[0066] Figure 1 Examples of wireless communication systems that support techniques for probing the phase coherence of a reference signal (SRS) according to various aspects of this disclosure are explained.

[0067] Figure 2 Examples of wireless communication systems that support techniques for SRS phase coherence according to various aspects of this disclosure are explained.

[0068] Figure 3 Examples of resource allocation schemes for techniques supporting SRS phase coherence according to various aspects of this disclosure are explained.

[0069] Figure 4 Examples of resource allocation schemes for techniques supporting SRS phase coherence according to various aspects of this disclosure are explained.

[0070] Figure 5 Examples of resource allocation schemes for techniques supporting SRS phase coherence according to various aspects of this disclosure are explained.

[0071] Figure 6 An example of the process flow supporting techniques for SRS phase coherence according to various aspects of this disclosure is explained.

[0072] Figure 7 and Figure 8 A block diagram of an apparatus for supporting SRS phase coherence techniques according to various aspects of this disclosure is shown.

[0073] Figure 9 A block diagram of a communication manager supporting techniques for SRS phase coherence according to various aspects of this disclosure is shown.

[0074] Figure 10 A diagram of a system including a device supporting technology for SRS phase coherence is shown according to various aspects of this disclosure.

[0075] Figure 11 and Figure 12 A block diagram of an apparatus for supporting SRS phase coherence techniques according to various aspects of this disclosure is shown.

[0076] Figure 13 A block diagram of a communication manager supporting techniques for SRS phase coherence according to various aspects of this disclosure is shown.

[0077] Figure 14 A diagram of a system including a device supporting technology for SRS phase coherence is shown according to various aspects of this disclosure.

[0078] Figures 15 to 19 A flowchart illustrating a method for supporting SRS phase coherence techniques according to various aspects of this disclosure is shown.

[0079] Detailed description

[0080] In some wireless communication systems, a base station can perform channel estimation of the wireless channel between itself and the UE based on a detection reference signal (SRS) received from the user equipment (UE). The base station can allocate a resource set for the UE to transmit SRS. In some aspects, the resource set can be contiguous in the time domain, frequency domain, or both, so that the UE can transmit a set of phase-coherent SRSs within that resource set (i.e., each SRS transmission uses the same phase). In some aspects, after allocating a resource set for SRS, the base station can cancel at least a portion of the allocated SRS resources so that the resources can be used for other higher-priority wireless transmissions, resulting in gaps in the bundled SRS resource set. The base station can cancel or release the allocation of previously allocated SRS resources via one or more control messages, such as an Uplink Cancellation Message (ULCI) message. In some cases, the UE may be unable to maintain phase coherence across gaps in the SRS resources caused by cancellation. Furthermore, some conventional wireless communication systems do not define UE phase coherence behavior when a portion of the allocated SRS resource set is canceled.

[0081] Accordingly, techniques for improving SRS phase coherence configuration are disclosed. The techniques described herein relate to a UE determining its phase coherence behavior for SRS transmission when a portion of an allocated SRS resource set is cancelled, resulting in a time or frequency gap within the allocated SRS resource set. Specifically, the techniques described herein can enable SRS transmissions with varying degrees of phase coherence in situations where at least a portion of the SRS resources within a bundled SRS resource set has been cancelled or released. For example, a base station can allocate a resource set that a UE can use to transmit a set of phase-coherent SRS. Subsequently, the base station can transmit a control message (e.g., ULCI) that cancels the allocation of at least a portion of the resource set available for SRS transmission. In this example, the UE can be configured to determine the phase coherence configuration to be applied to the uncancelled SRS resources and can transmit one or more SRSs within the uncancelled SRS resources according to the determined phase coherence configuration.

[0082] In some aspects, the UE can be configured to indicate to the base station one or more phase coherence configurations supported by the UE. In cases where at least a subset of SRS resources is cancelled or released, various phase coherence configurations can be associated with different degrees of phase coherence. For example, according to one phase coherence configuration, the cancellation of a subset of SRS resources may result in a loss of phase coherence, allowing the UE to transmit multiple SRS sets using different phases within the uncancelled SRS resources. According to another phase coherence configuration, the UE can be configured to maintain phase coherence within a predefined threshold. For example, in cases where at least a subset of SRS resources is cancelled, the UE can be configured to transmit a first SRS set using a first phase and a second SRS set using a second phase, wherein the difference between the first and second phases satisfies a predefined threshold. In yet another phase coherence configuration, the UE can be configured to maintain phase coherence within the uncancelled SRS resources if certain conditions or parameters are met. For example, if the time interval of the gap caused by cancellation is less than a predefined time threshold, if no other uplink transmission is scheduled during the time period of the cancelled SRS resource, or both, the UE can be configured to maintain phase coherence across uncancelled SRS resources.

[0083] The techniques described herein enable SRS transmission with varying degrees of phase coherence even when at least a portion of the SRS resources within a bundled SRS resource set have been cancelled or released. Specifically, by supporting multiple different phase coherence configurations, the techniques described herein allow the wireless communication system to maintain a certain degree of phase coherence based on the responsiveness of the UE within the system. Furthermore, by supporting defined phase coherence configurations, the techniques described herein can improve the phase coherence of SRS signals even when at least a subset of SRS resources has been cancelled or released, thereby achieving more accurate channel estimation and improving the efficiency and reliability of wireless communication.

[0084] The aspects of this disclosure are initially described in the context of wireless communication systems. Additional aspects of this disclosure are described in the context of example resource allocation schemes and example process flows. The aspects of this disclosure are further illustrated and described by means of and reference to apparatus diagrams, system diagrams, and flowcharts related to techniques for SRS phase coherence.

[0085] Figure 1Examples of wireless communication systems 100 supporting techniques for SRS phase coherence according to various aspects of this disclosure are described. 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, 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, 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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 unit, 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.

[0091] 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.

[0092] 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 may be used in conjunction with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0093] 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).

[0094] 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).

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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 N f 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).

[0099] 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.

[0100] 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)).

[0101] 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 hybrid TDM-FDM techniques. 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., CORESET) can be configured for a set of UEs 115. For example, one or more 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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).

[0107] 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).

[0108] 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.

[0109] 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 coexist 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.

[0110] 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.

[0111] 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).

[0112] 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.

[0113] 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.

[0114] 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).

[0115] A receiving device (e.g., UE 115) may attempt multiple receiving 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 receiving device may attempt multiple receiving directions by: receiving via different antenna subarrays; processing received signals according to different antenna subarrays; receiving according to different sets of receiving 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 receiving 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 receiving configurations or receiving directions. In some examples, the receiving device may use a single receiving configuration to receive along a single beam direction (e.g., when a data signal is received). A single receiver configuration can be aligned on a beam direction determined based on listening in different receiver configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), highest signal-to-interference-plus-noise ratio (SINR), or other acceptable signal quality based on listening in multiple beam directions).

[0116] 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 multiplexing of 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 UE 115 and base station 105 or core network 130 supporting user plane data radio bearers. At the physical layer, transport channels can be mapped to physical channels.

[0117] 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 some other time interval.

[0118] In some aspects, the UE 115 and base station 105 of the wireless communication system 100 can support techniques for improved SRS phase coherence configuration. Specifically, the techniques described herein can enable SRS transmission with varying degrees of phase coherence in situations where at least a portion of the SRS resources within a bundled SRS resource set has been cancelled or released. For example, the base station 105 of the wireless communication system 100 can allocate a resource set that the UE 115 can use to transmit a set of phase-coherent SRS to the base station 105. Subsequently, the base station 105 can transmit a control message (e.g., ULCI) that cancels the allocation of at least a portion of the resource set available for transmitting SRS. In this example, the UE 115 can be configured to determine the phase coherence configuration to be applied by the UE 115 associated with the uncancelled SRS resources, and can transmit one or more SRS within the uncancelled SRS resources according to the determined phase coherence configuration.

[0119] In some aspects, UE 115 can be configured to indicate to base station 105 one or more phase coherence configurations supported by UE 115. In cases where at least a subset of SRS resources is cancelled or released, various phase coherence configurations can be associated with different degrees of phase coherence. For example, according to one phase coherence configuration, cancellation of a subset of SRS resources may result in a loss of phase coherence, allowing UE 115 to transmit multiple SRS sets using different phases within the uncancelled SRS resources. According to another phase coherence configuration, UE 115 can be configured to maintain phase coherence within a predefined threshold. For example, in cases where at least a subset of SRS resources is cancelled, UE 115 can be configured to transmit a first SRS set using a first phase and a second SRS set using a second phase, wherein the difference between the first and second phases satisfies a predefined threshold. In yet another phase coherence configuration, UE 115 can be configured to maintain phase coherence within the uncancelled SRS resources if certain conditions or parameters are met. For example, UE 115 can be configured to maintain phase coherence across uncancelled SRS resources if the time interval of the gap caused by cancellation is less than a predefined time threshold, if no other uplink transmissions are scheduled during the time period of the cancelled SRS resource, or both.

[0120] The techniques described herein enable SRS transmission with varying degrees of phase coherence even when at least a portion of the SRS resources within a bundled SRS resource set have been cancelled or released. Specifically, by supporting multiple different phase coherence configurations, the techniques described herein allow the wireless communication system 100 to maintain a certain degree of phase coherence based on the capabilities of the UE 115 within the wireless communication system 100. Furthermore, by supporting the defined phase coherence configurations, the techniques described herein can improve the phase coherence of the SRS signal even when at least a subset of the SRS resources has been cancelled or released, thereby achieving more accurate channel estimation and improving the efficiency and reliability of wireless communication within the wireless communication system 100.

[0121] Figure 2 Examples of a wireless communication system 200 supporting techniques for SRS phase coherence according to various aspects of this disclosure are described. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100. The wireless communication system 200 may include a UE 115-a and a base station 105-a, which may be as described in reference... Figure 1 Examples of UE 115 and base station 105 described.

[0122] In some aspects, UE 115-a and base station 105-a may communicate with each other using one or more beams, one or more carriers, one or more communication links, or any combination thereof. In some aspects, UE 115-a and base station 105-a may communicate with each other via beam pairs including uplink and downlink beams. In some aspects, UE 115-a and base station 105-a may communicate with each other via communication link 205. In some aspects, communication link 205 may include examples of access links (e.g., Uu links). Communication link 205 may include a bidirectional link, which may include both uplink and downlink communication. For example, UE 115-a may use communication link 205 to transmit uplink transmissions (such as uplink control signals or uplink data signals) to base station 105-a, and base station 105-a may use communication link 205 to transmit downlink transmissions (such as downlink control signals or downlink data signals) to UE 115-a. In some respects, the wireless communication system 200 may support wireless communication with a wireless device (e.g., UE 115-a) via one or more serving cells of the wireless communication system 200. Each serving cell may be supported by one or more base stations 105 of the wireless communication system 200.

[0123] As previously mentioned herein, in some cases, base station 105-a may perform channel estimation of the radio channel between base station 105-a and UE 115-a based on the SRS 220 received from UE 115-a. Base station 105-a may allocate a resource set for UE 115-a to transmit SRS 220. In some aspects, the resource set may be contiguous in the time domain, frequency domain, or both, such that UE 115-a can transmit a set of phase-coherent SRS 220 within that resource set (i.e., SRS 220 transmissions are each transmitted using the same phase). In some aspects, after allocating a resource set for SRS 220, base station 105-a may cancel at least a portion of the allocated SRS resources so that those resources can be used for other higher-priority radio transmissions, resulting in gaps in the bundled SRS resource set. Base station 105-a may cancel or release the allocation of previously allocated SRS resources via one or more control messages (such as ULCI messages). In some situations, UE 115-a may be unable to maintain phase coherence across gaps in SRS resources caused by cancellation. Furthermore, some conventional wireless communication systems do not define UE phase coherence behavior when a portion of the allocated SRS resource set is cancelled.

[0124] Accordingly, the wireless communication system 200 can be configured to support techniques for improved SRS phase coherence configurations. Specifically, the wireless communication system 200 can support techniques that enable the UE 115-a to determine its phase coherence behavior for SRS transmission when a portion of the allocated SRS resource set is cancelled or released, resulting in time and / or frequency gaps in the allocated SRS resource set. In some aspects, the UE 115-a can be configured to support one or more phase coherence configurations, wherein each phase coherence configuration can achieve SRS transmissions with different degrees of phase coherence in cases where at least a portion of the SRS resources within the bundled SRS resource set has been cancelled or released. By supporting multiple different phase coherence configurations, the techniques described herein can provide improved phase coherence in the transmitted SRS, which can lead to more efficient channel estimation, thereby improving the efficiency and reliability of wireless communication within the wireless communication system 200.

[0125] For example, UE 115-a may transmit a capability report 210 (e.g., UE capability report 210) to base station 105-a. Capability report 210 may indicate one or more parameters associated with SRS phase coherence at UE 115-a. In some cases, capability report 210 may include indications of one or more phase coherence configurations supported by UE 115-a in the event that at least a subset of SRS resources is cancelled. As will be described in further detail herein, the term "phase coherence configuration" can be used to describe various configurations, formats, or rules by which UE 115-a maintains (or does not maintain) phase coherence for SRS 220 transmitted in the resource set in the event that at least a portion of the resource set is cancelled or released.

[0126] For example, capability report 210 can indicate whether UE 115-a is able to maintain SRS phase coherence (e.g., strict phase coherence, where phase coherence is maintained or not) in the event that a subset of SRS resources is cancelled. For example, as will be referred to Figure 4 As further described in the resource allocation 405-b, the capability report 210 may include an indication of phase coherence configuration that indicates whether the UE 115-a can maintain phase coherence between a first set of SRS 220 transmitted before resources canceled in resource set 415-c and a second set of SRS 220 transmitted after resources canceled in resource set 415-c.

[0127] By another example, capability report 210 may include an indication of phase coherence configuration that indicates whether UE 115-a can maintain SRS phase coherence when certain conditions are met. For example, as referenced Figure 4As further described in the resource allocation 405-b, the capability report 210 may indicate whether the UE 115-a is able to maintain phase coherence between the first set of SRS 220 transmitted before the resource cancelled in resource set 415-c and the second set of SRS 220 transmitted after the resource cancelled in resource set 415-c, based on the time duration of the cancelled resource, based on whether another transmission (e.g., an uplink transmission) was scheduled within the cancelled resource, or both.

[0128] By another example, capability report 210 may include an indication of phase coherence configuration that indicates whether UE 115-a is able to maintain SRS phase coherence under lenient requirements (e.g., lenient phase coherence). For example, as referenced Figure 4 As further described in the resource allocation 405-b, the capability report 210 can indicate whether UE115-a can maintain phase coherence within a certain phase threshold (e.g., within 10 degrees or another phase threshold) between the first SRS 220 set transmitted before the resources canceled in resource set 415-c and the second SRS 220 set transmitted after the resources canceled in resource set 415-c.

[0129] Additionally, the capability report 210 can indicate whether UE 115-a can maintain phase coherence for SRS 220 transmitted on different component carriers in the frequency domain when a subset of resources in the component carrier is cancelled, as will be referred to herein. Figure 5 Further detailed description.

[0130] Capability report 210 may additionally or alternatively indicate other parameters for SRS phase coherence at UE 115-a. For example, capability report 210 may indicate one or more conditions that must be met for UE 115-a to maintain phase coherence across SRS 220 transmitted by UE 115-a. For instance, capability report 210 may indicate whether UE 115-a can or cannot maintain phase coherence in different subsets of SRS 220 when other uplink transmissions are scheduled during gaps in SRS resources caused by cancellation. By another example, capability report 210 may indicate whether UE 115-a can or cannot maintain phase coherence in different subsets of SRS 220 when the time interval of the gap in SRS resources caused by cancellation is greater than or less than a specific time interval threshold. In this example, capability report 210 may indicate this time interval threshold. By way of another example, the capability report 210 can indicate a phase threshold that indicates that the UE 115-a is able to maintain SRS phase coherence within an indicated phase threshold for relaxed phase coherence.

[0131] In some aspects, base station 105-a may transmit control message 215-a to UE 115-a. In some aspects, base station 105-a may transmit control message 215-a based on receiving capability report 210. Control message 215-a may include RRC messages, downlink control information (DCI) messages, MAC control element (MAC-CE) messages, or any combination thereof. In some aspects, control message 215-a may include an indication of which phase coherence configuration UE 115-a should utilize. For example, in a case where UE 115-a indicates via capability report 210 that it can apply multiple phase coherence configurations, base station 105-a may indicate via control message 215-a which phase coherence configuration UE 115-a should apply. By way of another example, control message 215-a may indicate one or more parameters or characteristics associated with SRS phase coherence at UE 115-a, including a time interval threshold for the gap of SRS resources caused by cancellation, a phase threshold for relaxed phase coherence, or any combination thereof.

[0132] In some aspects, base station 105-a may transmit control message 215-b to UE 115-a, which includes an indication of a resource set for transmitting phase-coherent SRS 220. In this regard, base station 105-a may indicate a time resource set, a frequency resource set, a spatial resource set, or any combination thereof, which can be used by UE 115-a to transmit phase-coherent SRS 220. The SRS resource set indicated by control message 215-b may be associated with periodic SRS 220, semi-periodic SRS 220, aperiodic SRS 220, or any combination thereof. In some aspects, control message 215-b including an indication of the SRS resource set may include a DCI message. For example, control message 215-a including an indication of the SRS resource set may include a unicast DCI message, a group-shared DCI message, or both. In some cases, control message 215-b, which includes an indication of an SRS resource set, may additionally indicate that at least a subset of the SRS resource set is associated with a Time Division Orthogonal Covering Code (TD-OCC) (e.g., a Time Domain Orthogonal Covering Code). Base station 105-a may transmit control message 215-b, which includes an indication of an SRS resource set, based on receive capability report 210, transmission control message 215-a (e.g., an RRC message), or both.

[0133] Subsequently, base station 105-a may transmit control message 215-c, which indicates cancellation of the allocation of the first portion of the SRS resource set indicated in control message 215-b. In some cases, control message 215-c indicating cancellation may include a ULCI message. Base station 105-a may transmit control message 215-c indicating cancellation based on receiving capability report 210, transmitting control message 215-a (e.g., RRC message), transmitting control message 215-b including an indication of the SRS resource set (e.g., DCI message), or any combination thereof. For example, capability report 210 may indicate that UE 115-a can maintain phase coherence if the time interval of the SRS resource gap caused by cancellation is less than a time interval threshold. In this example, base station 105-a may transmit a control message 215-c indicating cancellation, such that the time interval of the first part of the SRS resource set (e.g., the cancelled part) is less than a time interval threshold, so that UE 115-a can maintain phase coherence across the transmitted SRS 220.

[0134] In some cases, the indications or parameters previously described as indicated in control message 215-a (e.g., RRC message) may additionally or alternatively be indicated via control message 215-b (e.g., DCI message) which includes an indication of SRS resources, control message 215-c (e.g., ULCI) indicating cancellation, or both. For example, in some cases, base station 105-a may additionally indicate to UE 115-a which phase coherence configuration to utilize, along with control message 215-b indicating an SRS resource set and / or control message 215-c indicating cancellation. Additionally or alternatively, control message 215-b indicating an SRS resource set and / or control message 215-c indicating cancellation may include indications of one or more parameters associated with SRS phase coherence, including a time interval threshold for maintaining phase coherence, a phase threshold for relaxed phase coherence, or any combination thereof.

[0135] In some aspects, UE 115-a, base station 105-a, or both can determine the phase coherence configuration associated with the second portion (e.g., the uncancelled portion) of the SRS resource set. In this regard, UE 115-a and / or base station 105-a can be configured to determine whether the phase coherence within SRS 220 transmitted in the second portion (e.g., the uncancelled portion) of the SRS resource set is to be fully maintained, maintained under certain conditions, maintained with lenient requirements (e.g., transmitting SRS 220 with a phase within a certain phase threshold), or lost (e.g., not maintained). In some aspects, UE 115-a and / or base station 105-a can determine the phase coherence configuration based on capability report 210, control message 215-a (e.g., RRC message), control message 215-b indicating the SRS resource set, control message 215-c indicating the cancellation of the allocation of the first portion (e.g., ULCI message), or any combination thereof.

[0136] In some aspects, UE 115-a may transmit one or more SRS 220s within a second portion (e.g., an uncancelled portion) of the SRS resource set indicated via control message 215-b. The one or more SRS 220s may include, but are not limited to, periodic SRS, semi-periodic SRS, aperiodic SRS, or any combination thereof. In some aspects, UE 115-a may transmit (and base station 105-a may receive) one or more SRS 220s based on a determined phase coherence configuration. Accordingly, based on capability report 210, control message 215-a (e.g., RRC message), control message 215-b indicating the SRS resource set (e.g., DCI message), control message 215-c indicating cancellation (e.g., ULCI), the determined phase coherence configuration, or any combination thereof, UE 115-a may transmit and base station 105-a may receive one or more SRS 220s.

[0137] For example, UE 115-a can transmit a first phase-coherent SRS 220 set and a second phase-coherent SRS 220 set different from the first phase-coherent SRS 220 set. In some cases, the first phase-coherent SRS 220 set can be transmitted in the time domain before the first portion of the SRS resource set associated with cancellation, and the second phase-coherent SRS 220 set can be transmitted in the time domain after the first portion of the SRS resource set associated with cancellation. In some cases, the first phase-coherent SRS 220 set and the second phase-coherent SRS 220 set can be transmitted with shared phase coherence (e.g., maintaining phase coherence) or with different phase coherence (e.g., not maintaining phase coherence, or maintaining phase coherence within a certain phase threshold). For example, phase coherence can be maintained when the first phase-coherent SRS 220 set and the second phase-coherent SRS 220 set are associated with a shared phase. Conversely, if the first phase coherent SRS 220 set is associated with the first phase and the second phase coherent SRS 220 set is transmitted with a second phase different from the first phase, phase coherence may not be maintained.

[0138] By another example, phase coherence can be maintained leniently if a first phase coherent SRS 220 set is transmitted using a first phase and a second phase coherent SRS 220 set is transmitted using a second phase different from the first phase, provided that the phase difference between the first and second phases satisfies a phase threshold. In some cases, the phase difference between the first and second phases satisfies the phase threshold if the phase difference is less than the phase threshold. In this regard, the first and second phase coherent SRS 220 sets can be transmitted using different phases, provided that the corresponding phases are within a predefined phase threshold (e.g., a phase difference of less than 10 degrees). In some aspects, the phase threshold can be indicated via capability report 210, control message 215-a, control message 215-b indicating an SRS resource set (e.g., a DCI message), control message 215-c indicating cancellation, or any combination thereof.

[0139] In some scenarios, UE 115-a may transmit one or more SRS 220s with shared phase coherence (e.g., maintaining phase coherence) under certain conditions. For example, UE 115-a may transmit a first set of SRS 220s and a second set of SRS 220s with shared phase coherence in a second set of SRS resource set, provided that the time interval of the first part of the SRS resource set associated with cancellation meets a time interval threshold, and that no other transmissions (e.g., uplink transmissions) are scheduled within the first part of the SRS resource set associated with cancellation, or both. For example, UE 115-a may transmit the first and second sets of SRS 220s if the time interval of the first part of the SRS resource set associated with cancellation is less than a time interval threshold. In this example, the time interval threshold may be indicated via capability report 210, control messages 215-a, 215-b, 215-c, or any combination thereof. By way of another example, UE 115-a can transmit a first SRS 220 set and a second SRS 220 set with shared phase coherence based on uplink transmissions within a first portion of the schedule associated with cancellation that identify the absence of the SRS resource set.

[0140] In some respects, UE 115-a can transmit (or suppress transmission) SRS 220 within a second portion of an SRS resource set associated with TD-OCC based on a portion of the SRS resource set being associated with TD-OCC. Specifically, in cases where a first portion of the SRS resource set associated with cancellation is associated with TD-OCC, UE 115-a can suppress transmission of SRS 220 within other SRS resources associated with TD-OCC, and can transmit SRS 220 within other SRS resources not associated with TD-OCC. For example, in some cases, the first portion of the SRS resource set associated with cancellation may be associated with TD-OCC. In this example, UE 115-a can transmit one or more SRS 220s based on one or more SRS 220s not being associated with TD-OCC, and can suppress transmission of one or more additional SRS 220s associated with TD-OCC.

[0141] In some scenarios, UE 115-a may transmit one or more SRS 220s with or without (e.g., without) phase coherence across one or more SRS 220s in the frequency domain. Specifically, phase coherence may be maintained or not maintained for the frequency domain based on the relative positioning of a first portion of the SRS resource set in the frequency domain. For example, the first SRS resource set indicated via control message 215-b may include a first SRS resource set associated with a first component carrier, a second SRS resource set associated with a second component carrier, and a third SRS resource set associated with a third component carrier. In this example, the first SRS resource set, the second SRS resource set, and / or the third SRS resource set may be associated with shared phase coherence. Furthermore, the first component carrier, the second component carrier, and / or the third component carrier may include a set of frequency-adjacent component carriers. For example, the first component carrier, the second component carrier, and the third component carrier may include a set of frequency-adjacent component carriers, wherein the second component carrier is located between the first component carrier and the third component carrier in the frequency domain.

[0142] Continuing with the same example, the first portion of the SRS resource set associated with cancellation may be located within a second SRS resource set in a second component carrier. In this example, UE 115-a may, based on the fact that the first portion of the SRS resource set associated with cancellation is located within the second SRS resource set, transmit at least one subset of the first SRS 220 set in a first component carrier using a first phase, and may transmit at least one subset of the second SRS 220 set in a second component carrier using a second phase different from the first phase. In other words, as a result of canceling at least one resource subset associated with the second SRS resource set, phase coherence between at least a portion of the first SRS 220 set and the second SRS 220 set may not be maintained. Similarly, UE 115-a may, based on the fact that the first portion of the SRS resource set associated with cancellation is located within the second SRS resource set, transmit at least one subset of the first SRS 220 set in a first component carrier using a first phase, and transmit at least one subset of the third SRS 220 set in a third component carrier using a phase different from the first phase. In other words, as a result of canceling at least one subset of resources associated with the second SRS 220 set, the phase coherence between at least a portion of the first SRS 220 set and the third SRS 220 set may not be maintained.

[0143] In some aspects, base station 105-a can determine a channel estimate associated with the channel between UE 115-a and base station 105-a. In some aspects, base station 105-a can determine the channel estimate based on one or more SRS 220 received from UE 115-a. For example, base station 105-a can perform one or more measurements on one or more received SRS 220 (e.g., Received Signal Strength Indicator (RSSI) measurement, Reference Received Power (RSRP) measurement, Reference Received Quality (RSRQ) measurement, SNR measurement, SINR measurement), and can determine the channel estimate based on the performed measurements.

[0144] In some aspects, base station 105-a can be configured to employ different channel estimation techniques based on the corresponding phase coherence of the received SRS 220. For example, base station 105-a can receive a first set of phase-coherent SRS 220 and a second set of phase-coherent SRS 220 different from the first set of phase-coherent SRS 220. In the case where the first set of phase-coherent SRS 220 is associated with a first phase and the second set of phase-coherent SRS 220 is associated with a second phase different from the first phase, base station 105-a can be configured to perform channel estimation by performing additive combination within the respective set of phase-coherent SRS 220. However, in this case, since the phases associated with the first and second sets of phase-coherent SRS 220 are different, additive combination may not be possible across the first and second sets of phase-coherent SRS 220. Conversely, in the case where the first and second phase coherent SRS 220 sets transmit / receive using a shared phase (and / or a phase within a certain phase threshold), the base station 105-a can be configured to perform channel estimation by performing additive combination within and / or across the corresponding phase coherent SRS 220 sets, due to the same and / or similar phases associated with the corresponding phase coherent SRS 220 sets.

[0145] In some aspects, base station 105-a can determine a precoder associated with downlink transmission 225 emitted by base station 105-b. In this regard, base station 105-a can determine a precoder that can be used to transmit downlink transmission 225 to UE 115-a. In some aspects, base station 105-a can determine the precoder based on the determined channel estimate, and can transmit downlink transmission 225 to UE 115-a based on (e.g., according to) the determined precoder. In this regard, base station 105-a can transmit downlink transmission 225 based on the determined channel estimate.

[0146] Furthermore, in some cases, UE 115-a can transmit uplink transmission 230 to base station 105-a. In some aspects, base station 105-a can demodulate uplink transmission 230 based on determined channel estimates.

[0147] The techniques described herein enable SRS transmission with varying degrees of phase coherence even when at least a portion of the SRS resources within a bundled SRS resource set have been cancelled or released. Specifically, by supporting multiple different phase coherence configurations, the techniques described herein allow wireless devices (e.g., UE 115-a, base station 105-a) within a wireless communication system (e.g., wireless communication systems 100, 200) to maintain a certain degree of phase coherence based on the corresponding capabilities of UE 115 within that wireless communication system. Furthermore, by supporting the defined phase coherence configurations, the techniques described herein can improve the phase coherence of SRS signals even when at least a subset of the SRS resources has been cancelled or released, thereby achieving more accurate channel estimation and improving the efficiency and reliability of wireless communication within the wireless communication system.

[0148] Figure 3 Examples of a resource allocation scheme 300 supporting techniques for SRS phase coherence according to various aspects of this disclosure are explained. In some examples, the resource allocation scheme 300 may implement aspects of wireless communication system 100, wireless communication system 200, or both, or be implemented therein. In some aspects, the resource allocation scheme 300 explains a first resource allocation 305-a that explains SRS resource allocation, and a second resource allocation 305-b that explains the cancellation of SRS resource allocation.

[0149] As previously mentioned herein, base station 105 may be configured to perform channel estimation of the channel between base station 105 and UE 115 by performing measurements on SRS received from UE 115. In this regard, base station 105 may be configured to allocate a set of resources that UE 115 can use to transmit SRS. For example, as shown in resource allocation 305-a, base station 105 may transmit a control message (e.g., DCI 310-a) that allocates a set of resources 315-a that UE 115 can use to transmit SRS. In some aspects, base station 105 may be configured to increase coverage and capacity by allocating a coherent set of resources for SRS transmission. For example, resource set 315-a may span multiple coherent (e.g., contiguous) symbols so that UE 115 can transmit a coherent set of SRS within resource set 315-a. In some aspects, base station 105 may be configured to increase coverage, increase capacity, and / or compensate for capacity loss by allocating a resource set such that at least a portion of the resource set is associated with TD-OCC. For example, SRS duplication can be improved by assigning resource set 315-a such that at least a portion of resource set 315-a is associated with TD-OCC. The TD-OCC associated with the resource set can be associated with multiple ports.

[0150] In some cases, resource set 315-a may be contiguous in the time domain, frequency domain, or both. In some cases, the allocation of coherent (e.g., contiguous) resource sets 315 for SRS transmission may be referred to as an “SRS bundle.” (See reference herein.) Figure 4 As discussed in further detail, resource set 315-a may be located within a single time slot (e.g., inter-time slot SRS time bundle), span two or more time slots (e.g., intra-time slot SRS time bundle), or both. Furthermore, in some aspects, base station 105 may bundle different SRS resources (e.g., codebooks and / or antenna switching).

[0151] In some respects, UE 115 can be configured to transmit SRS to base station 105 within resource set 315-a. Specifically, UE 115 can be configured to transmit a set of phase-coherent SRSs within resource set 315-a. For example, in the case where resource set 315-a spans four individual symbols, UE 115 can be configured to transmit SRS within each symbol (e.g., four individual SRSs), where each corresponding SRS is transmitted with a shared phase. Maintaining phase coherence between coherent SRSs allows base station 105 to improve the accuracy of channel estimation based on the received phase-coherent SRSs, compared to transmitting SRSs without phase coherence (e.g., different phases).

[0152] Some wireless communication systems can support one or more coverage / capacity enhancement schemes within the context of SRS transmission. Coverage enhancement schemes can include Category 1 coverage enhancement schemes utilizing time bundles, Category 2 coverage enhancement schemes increasing SRS repetition, and Category 3 coverage enhancement schemes based on partial frequency probes. Under Category 1 coverage enhancement schemes, wireless communication systems can utilize the relationship between SRS resources across one or more time slots to achieve joint processing of SRS in the time domain. Phase discontinuities, interruptions to SRS transmission by other uplink signals, and other characteristics or parameters may affect the efficiency of Category 1 coverage enhancement schemes. Under Category 2 coverage enhancement schemes, wireless communication systems can change the legacy SRS pattern in a resource and / or an SRS transmission timing by increasing the number of SRS symbols used for repetition. In some aspects, SRS resources can be associated with TD-OCC to compensate for negative impacts on SRS capacity. Parameters that may affect the practicality of Category 2 coverage enhancement schemes may include inter-cell interference randomization and whether SRS resources are bundled according to inter- or intra-time slot SRS time bundles. Finally, under Category 3 coverage enhancement schemes, wireless communication systems can support improved flexibility in SRS frequency resources to allow SRS transmissions on a subset of frequency resources within the legacy SRS frequency resource set. Parameters that may affect the usability of Category 3 coverage enhancement schemes may include whether the allocated frequency resources are at the resource block level or the subcarrier level (e.g., larger comb teeth, partial bandwidth), peak-to-average power ratio (PAPR), etc.

[0153] As previously mentioned herein, some wireless communication systems can cancel (e.g., release) allocations associated with previously allocated resources. Some wireless communication systems can support the cancellation of allocations of SRS resources (e.g., resource set 315-b), Physical Uplink Shared Channel (PUSCH) resources, or both. For example, as shown in resource allocation 305-b, base station 105 can transmit a control message (e.g., DCI 310-b) to UE 115, which allocates resource set 315-b that UE 115 can use to transmit SRS. Subsequently, base station 105 can transmit additional control messages (e.g., ULCI 320) canceling the allocation of at least a portion of resource set 315-b. In some aspects, ULCI 320 may include DCI format 2_4. In some aspects, Figure 3 The ULCI 320 described in the text can be... Figure 1 An example of control message 215-b shown and described.

[0154] In this regard, ULCI 320 can instruct the cancelled portion of resource set 315-b to no longer be allocated for UE 115 to perform SRS transmissions. In some aspects, base station 105 can cancel the allocation of at least a portion of resource set 315-b, such that the cancelled portion of resource set 315-b can be used for other higher priority transmissions (e.g., higher priority URLLC transmissions). In some aspects, the transmission timing for ULCI 320 transmissions can be configured via control signaling (e.g., RRC signaling), wherein a time slot can include one or more ULCI 320 transmission timings. In this regard, upon receiving DCI 310-b scheduling / allocating resource set 315-b, UE 115 can be configured to monitor one or more ULCI 320 transmission timings located between DCI 310-b and resource set 315-b to monitor for potential cancellation of at least a portion of resource set 315-b.

[0155] In some aspects, the ULCI 320 for canceling the allocation of at least a portion of resource set 315-b may be transmitted and / or received at UE 115 within a time interval 325 prior to the cancellation of the allocation of resource set 315-b by ULCI 320. In some aspects, time interval 325 may be associated with a processing time at UE 115, wherein UE 115 receives ULCI 320 and processes the cancellation indicated by ULCI 320. In other words, time interval 325 may indicate a time duration after receiving ULCI 320, wherein UE 115 may not be able to effectively process and implement the cancellation of the resource allocation canceled by ULCI 320. In some aspects, time interval 325 may be indicated by UE 115 to base station 105 via UE capability signaling, may be configured via RRC signaling, or both.

[0156] Canceling at least a portion of resource set 315-b may lead to some processing complexity at UE 115. For example, if other uplink transmissions (e.g., PUSCH transmissions) are scheduled within the canceled portion of resource set 315-b, UE 115 may be required to retune radio frequency components to transmit those other uplink transmissions with varying parameters (e.g., different frequencies, different modulation schemes, different power), and then subsequently retune the radio frequency components back to handle the remaining SRS transmissions. Such retuning can make it more difficult for UE 115 to maintain phase coherence for SRS transmissions within the uncancelled resources of resource set 315-b. Furthermore, the duration of the canceled portion of resource set 315-b can further affect UE 115's ability to maintain SRS phase coherence. For example, if the duration of the canceled portion (e.g., a gap) of resource set 315-b exceeds a certain threshold, UE 115 may shut down radio frequency components to save power, which may make maintaining phase coherence more difficult. Conversely, if the duration of the cancelled portion (e.g., the gap) of resource set 315-b is less than a certain threshold, UE 115 may not shut down the radio frequency components, which can improve the ability to maintain phase coherence.

[0157] As previously mentioned herein, some wireless communication systems do not define how UE 115 handles SRS transmissions regarding phase coherence when a portion of the resource set 315-b allocated for SRS transmission is cancelled. That is, some wireless communication systems do not define whether UE 115 should maintain phase coherence for SRS transmitted in the uncancelled resources of resource set 315-b, or whether it should discard (e.g., not maintain) phase coherence upon cancellation indicated by ULCI 320. Furthermore, in cases where a portion of the resource set 315-b allocated for SRS transmission is cancelled, some UE 115 may not be able to maintain phase coherence. For example, if the gap in the allocated resources due to cancellation is less than a certain threshold time duration in the time domain, some UE 115 may not be able to maintain phase coherence for SRS transmitted in the uncancelled resources of the resource set.

[0158] Accordingly, the technology of this disclosure relates to improved SRS phase coherence configuration. Specifically, the technology described herein enables UE 115 to determine its phase coherence behavior for SRS transmission when a portion of an allocated SRS resource set (e.g., resource set 315-b) is cancelled or released, resulting in time and / or frequency gaps within the allocated SRS resource set. Accompanying advantages of this disclosure are further described with reference to... Figure 4-6 Show and describe.

[0159] Figure 4Examples of a resource allocation scheme 400 supporting techniques for SRS phase coherence according to various aspects of this disclosure are explained. In some examples, the resource allocation scheme 400 may be implemented or by aspects of wireless communication system 100, wireless communication system 200, or any combination thereof. In some aspects, the resource allocation scheme 400 explains a first resource allocation 405-a and a second resource allocation 405-b that explains the SRS clustering and the cancellation of the allocated SRS resources.

[0160] In some aspects, resource allocation 405-a describes inter-slot SRS time clustering, wherein resource sets 415 allocated for SRS transmission are clustered within corresponding transmission time intervals (e.g., time slot 410). For example, base station 105 may allocate a first resource set 415-a for SRS transmission in a first time slot 410-a (e.g., time slot n), and a second resource set 415-b for SRS transmission in a second time slot 410-b (e.g., time slot n+1). In some cases, the first time slot 410-a and the second time slot 410-b may include adjacent (e.g., consecutive) time slots 410.

[0161] In some aspects, each of the first and second resource sets 415-a and 415-b may span the symbol set within each corresponding time slot 410. Furthermore, each of the first and second resource sets 415-a and 415-b is contiguous in the time domain. For example, the first resource set 415-a may span symbols 10-13 of the first time slot 410-a, and the second resource set 415-b may span symbols 10-13 of the second time slot 410-b. In some aspects, resource sets 415-a and 415-b may be configured for the transmission of phase-coherent SRS. In this regard, UE 115 may be configured to transmit phase-coherent SRS sets within the corresponding resource sets 415-a and 415-b. For example, the first resource set 415-a may be allocated for UE 115 to transmit a first phase-coherent SRS set, and the second resource set 415-b may be allocated for UE 115 to transmit a second phase-coherent SRS set. In some respects, phase coherence may or may not be maintained between the respective sets of phase-coherent SRS transmitted in the first resource set 415-a and the second resource set 415-b, respectively.

[0162] In contrast, resource allocation 405-b describes intra-slot SRS time clustering, wherein resource set 415-c allocated for SRS transmission is clustered across multiple transmission time intervals (e.g., multiple time slots 410). For example, base station 105 may allocate resource set 415-c for SRS transmission, wherein resource set 415-c includes one or more symbols in a first time slot 410-c (e.g., time slot n) and one or more symbols in a second time slot 410-d (e.g., time slot n+1). As described with reference to resource allocation 405-a, resource set 415-c described in resource allocation 405-b may span a coherent set of symbols across the first time slot 410-c and the second time slot 410-d. For example, as Figure 4 As shown, resource set 415-c can span symbols 10-13 of the first time slot 410-c and symbols 0-3 of the second time slot 410-d. Furthermore, resource set 415-c can be contiguous in the time domain, such that UE115 is configured to transmit a phase-coherent set of SRS within resource set 415-c.

[0163] In some cases, phase coherence configuration can specify phase coherence behavior across bundled resources (SRS repetition). For example, phase coherence configuration can specify that SRS phase coherence is not maintained across all symbols if one or more symbols within a bundled SRS symbol set (e.g., within resource sets 415-a, 415-b, 415-c) are cancelled due to ULCI. Thus, phase coherence can be maintained across coherent symbols within resource sets 415-a, 415-b, 415-c, but not across non-coherent symbols. For example, referring to resource allocation 405-b, ULCI can instruct cancellation of resource allocation in symbols 0 and 1 of second time slot 410-d. In this example, UE 115 can maintain phase coherence across symbols 10-13 of time slot 410-c and can maintain phase coherence across symbols 2-3 of time slot 410-d. However, the phase coherence maintained by symbols 10-13 across time slot 410-c can be different from the phase coherence maintained by symbols 2-3 across time slot 410-d.

[0164] As previously mentioned herein, base station 105 may subsequently cancel (e.g., release) at least a portion of resource set 415 allocated for SRS transmission. For example, referring to resource allocation 405-a, base station 105 may transmit a control message (e.g., ULCI) to UE 115, wherein the ULCI indicates cancellation of a first portion of resource set 415-b. By another example, referring to resource allocation 405-b, base station 105 may transmit a control message (e.g., ULCI) to UE 115, wherein the ULCI indicates cancellation of a first portion of resource set 415-c. In these examples, cancellation of the respective portions of resource sets 415-b and 415-c effectively results in “gap” in the time domain of the respective resource sets 415-b and 415-c. Some wireless communication systems do not define how UE 115 should handle the phase coherence associated with SRS transmissions in bundled SRS resource sets (e.g., resource sets 415-b and 415-c) that include gaps attributable to cancellation. In other words, some wireless communication systems do not specify whether UE 115 is expected to maintain phase coherence for SRS transmissions across resource sets 415-b and 415-c when the corresponding resource sets 415-b and 415-c include cancelled resources. Additionally, depending on certain characteristics of the parameters of the gap caused by the cancelled resources, some UE 115 may not be able to maintain phase coherence for SRS transmissions within resource sets 415-b and 415-c.

[0165] Accordingly, the techniques described herein enable UE 115 to determine its phase coherence behavior for SRS transmission when a portion of an allocated SRS resource set (e.g., resource sets 415-b and 415-c) is cancelled, resulting in a time or frequency gap within the allocated SRS resource set. Specifically, the techniques described herein can enable SRS transmissions with varying degrees of phase coherence even when at least a portion of the SRS resources within a bundled SRS resource set has been cancelled or released.

[0166] For example, when identifying the cancellation of the allocation of the first part of resource set 415-b, UE 115 can determine the phase coherence configuration associated with the second part of resource set 415-b (e.g., the uncancelled part), and can transmit one or more SRSs according to the determined phase coherence configuration.

[0167] For example, referring to resource allocation 405-a, UE 115 can receive an indication of resource set 415-b for transmitting the phase-coherent SRS set. Subsequently, UE 115 can receive a control message (e.g., ULCI) indicating the cancellation of the allocation of the first portion of resource set 415-b. Figure 4As shown, the first portion of resource set 415-b associated with cancellation may include symbols 11 and 12 within the second time slot 410-b. In practice, this cancellation may cause a second portion of resource set 415-b to precede (e.g., symbol 10) and follow (e.g., symbol 13) the first portion associated with the cancellation in the time domain. Similarly, referring to resource allocation 405-b, UE 115 may receive an indication for resource set 415-c used to transmit a phase-coherent SRS set. Subsequently, UE 115 may receive a control message (e.g., ULCI) indicating the cancellation of the allocation of the first portion of resource set 415-c. Figure 4 As shown, the first portion of resource set 415-c associated with cancellation may include symbols 0 and 1 within the second time slot 410-d. In practice, the cancellation may cause the second portion of resource set 415-c to appear in the time domain before (e.g., symbols 10-13 of the first time slot 410-c) and after (e.g., symbols 2 and 3 of the second time slot 410-d).

[0168] When identifying the first part of the cancelled resource set (e.g., symbols 11 and 12 in resource allocation 405-a, and / or symbols 0 and 1 in resource allocation 405-b), UE 115 may determine the phase coherence configuration associated with the second part (e.g., the uncancelled part) of the corresponding resource sets 415-b, 415-c, and may transmit one or more SRSs in the second part (e.g., the uncancelled part) according to the determined phase coherence configuration.

[0169] For example, referring to resource allocation 405-b, UE 115 can transmit a first phase-coherent SRS set and a second phase-coherent SRS set different from the first phase-coherent SRS set within the second portion (e.g., the uncancelled portion) of resource set 415-c, based on the determined phase coherence configuration. In some cases, the first phase-coherent SRS set may be transmitted in the time domain before the first portion of resource set 415-c associated with cancellation, and the second phase-coherent SRS set may be transmitted in the time domain after the first portion of resource set 415-c associated with cancellation. For example, the first phase-coherent SRS set may be transmitted in symbols 10-13 of the first time slot 410-c, while the second phase-coherent SRS set may be transmitted in symbols 2 and 3 of the second time slot 410-d.

[0170] The phase coherence between the first and second phase-coherent SRS sets transmitted before and after the resources cancelled in resource set 415-c can depend on the determined phase coherence configuration. For example, according to the first phase coherence configuration, the first phase-coherent SRS set (e.g., SRS transmitted in symbols 10-13 of the first time slot 410-c) and the second phase-coherent SRS set (e.g., SRS transmitted in symbols 2-3 of the second time slot 410-d) can be transmitted with a shared phase coherence (e.g., maintaining phase coherence). By another example, according to the second phase coherence configuration, the first phase-coherent SRS set (e.g., SRS transmitted in symbols 10-13 of the first time slot 410-c) and the second phase-coherent SRS set (e.g., SRS transmitted in symbols 2-3 of the second time slot 410-d) can be transmitted with different phase coherence (e.g., not maintaining phase coherence). For example, according to the second phase coherence configuration, the first phase coherent SRS set (e.g., the SRS transmitted in symbols 10-13 of the first time slot 410-c) can be transmitted with the first phase (e.g., first phase coherence), and the second phase coherent SRS set (e.g., the SRS transmitted in symbols 2-3 of the second time slot 410-d) can be transmitted with the second phase (e.g., second phase coherence) different from the first phase.

[0171] By another example, according to a third phase coherence configuration, a first phase coherent SRS set can be transmitted with a first phase (e.g., SRS transmitted in symbols 10-13 of the first time slot 410-c), and a second phase coherent SRS set can be transmitted with a second phase different from the first phase (e.g., SRS transmitted in symbols 2-3 of the second time slot 410-d), wherein the phase difference between the first and second phases satisfies a phase threshold, and phase coherence can be maintained with lenient requirements. In some cases, the phase difference between the first and second phases satisfies the phase threshold if the phase difference is less than the phase threshold. In this regard, the first and second phase coherent SRS sets can be transmitted with different phases, but wherein the corresponding phases are within a predefined phase threshold relative to each other (e.g., a phase difference of less than 10 degrees, or some other phase threshold).

[0172] Depending on some additional phase coherence configurations, UE 115-a can transmit one or more SRSs with shared phase coherence (e.g., maintaining phase coherence) under certain conditions. For example, depending on one or more additional phase coherence configurations, if the time interval of the first part of resource set 415-c associated with cancellation (e.g., the first part including symbols 0 and 1 of the second time slot 410-d) meets a time interval threshold, if no other transmissions (e.g., uplink transmissions) are scheduled within the first part of resource set 415-c associated with cancellation, or both, UE 115-a can transmit a first set of SRSs (e.g., SRS transmitted in symbols 10-13 of the first time slot 410-c) and a second set of SRSs (e.g., SRS transmitted in symbols 2-3 of the second time slot 410-d) with shared phase coherence.

[0173] For example, according to the fourth phase coherence configuration, if the time interval of the first portion associated with cancellation in resource set 415-c is less than or equal to a time interval threshold (e.g., if the first portion associated with cancellation is less than or equal to two symbol periods), UE 115-a can transmit first and second SRS sets (e.g., SRS sets transmitted before and after the cancelled symbols in the first portion). In one example, if the gap between an SRS transmission before the cancelled resource and an SRS transmission after the cancelled resource is less than or equal to a threshold (e.g., less than or equal to a two symbol period gap between SRS transmissions), UE 115-a can maintain phase coherence. In this example, in some cases, UE 115 can maintain phase coherence across resource set 415-c even if SRS transmissions in symbol periods 0 and 1 of the second time slot 410-d have been cancelled. For example, UE 115-a can transmit SRS in symbol periods 10-13 of the first time slot 410-c, which has a phase that is substantially the same as that of the SRS transmitted in symbol periods 2-3 of the second time slot 410-d (e.g., a phase difference that meets a threshold).

[0174] By way of another example, according to the fifth phase coherence configuration, UE 115-a can transmit the first and second SRS sets (e.g., the SRS sets transmitted before and after the canceled symbols in the first portion) using shared phase coherence based on uplink transmissions scheduled within the first portion associated with cancellation that identify the absence of an SRS resource set. For example, UE 115 can transmit the first and second SRS sets (e.g., the SRS sets transmitted before and after the canceled symbols in the first portion) using shared phase coherence even if no other uplink transmission (or other transmission) is scheduled within symbol 0 or 1 of its second time slot 410-d.

[0175] In some aspects, depending on the additional phase coherence configuration, UE 115 can transmit (or suppress transmission) SRS in the second part of resource sets 415-b and 415-c based on the association of a portion of the SRS resource set with TD-OCC. Specifically, in the case where the first part of resource sets 415-b and 415-c associated with cancellation is associated with TD-OCC, UE 115 can suppress the transmission of SRS 220 in other SRS resources associated with TD-OCC, and can transmit SRS 220 in other SRS resources not associated with TD-OCC. For example, referring to resource allocation 405-a, the first part of resource set 415-b associated with cancellation (e.g., symbols 11 and 12) can be associated with TD-OCC. In this example, UE 115-a can determine that the resource associated with symbol 10 is associated with TD-OCC, and can determine that the resource associated with symbol 13 is not associated with TD-OCC. In this example, and depending on the additional phase coherence configuration, UE 115 can transmit one or more SRSs within symbol 13 of resource set 415-b based on symbol 13 (and the SRS transmitted within symbol 13) not being associated with TD-OCC. Conversely, UE 115 can suppress the transmission of one or more additional SRSs within symbol 10 of resource set 415-b based on symbol 10 (and the SRS transmitted within symbol 10) being associated with TD-OCC.

[0176] Figure 5 Examples of resource allocation scheme 500 supporting techniques for SRS phase coherence according to various aspects of this disclosure are explained. In some examples, resource allocation scheme 500 may implement, or be implemented by, aspects of wireless communication system 100, wireless communication system 200, resource allocation scheme 300, resource allocation scheme 400, or any combination thereof.

[0177] In some respects, SRS resource sets are frequency-clustered across multiple component carriers (e.g., carrier clustering). In this regard, SRS resource sets can be clustered in the time domain (e.g., SRS time clustering), the frequency domain (e.g., SRS frequency clustering), or both. For example, as... Figure 5As shown, resource allocation 505 may include SRS resources aggregated across multiple component carriers 520. Specifically, resource allocation 505 may include a first resource set 515-a associated with a first component carrier 520-a (CC1), a second resource set 515-b associated with a second component carrier 520-b (CC2), and a third resource set 515-c associated with a third component carrier 520-c (CC3). In some aspects, the first component carrier 520-a, the second component carrier 520-b, and the third component carrier 520-c may include frequency-adjacent sets of component carriers. In other words, Figure 5 The component carriers 520 described herein can be adjacent in the frequency domain.

[0178] In some aspects, each resource set 515 may span one or more symbols across one or more time slots within each component carrier of the corresponding component carrier 520. In some aspects, each resource set in the corresponding resource set 515 may be contiguous in the time domain, such that UE 115 is configured to transmit phase-coherent SRS within each of the corresponding resource sets 515-a, 515-b, and 515-c. Additionally, the first resource set 515-a, the second resource set 515-b, and the third resource set 515-c may be associated with shared phase coherence. For example, UE 115 may be configured to transmit a first SRS set within the first resource set 515-a, a second SRS set within the second resource set 515-b, and a third SRS set within the third resource set 515-c. In this example, each SRS set in the first, second, and third SRS sets may be associated with shared phase coherence. In this regard, each of the first, second, and third SRS sets can be transmitted using a shared phase.

[0179] As previously mentioned with reference to SRS time clustering, in the case of SRS frequency clustering, canceling SRS resources can additionally or alternatively result in gaps in the SRS resources in the frequency domain. For example, as Figure 5 As shown, after allocating a corresponding resource set 515 for SRS transmission, base station 105 may subsequently transmit a control message (e.g., ULCI 525) indicating cancellation of a first portion of the second resource set 515-b within the second component carrier 520-b. In some aspects, the ULCI 525 indicating cancellation may be transmitted within the same component carrier 520 (e.g., the second component carrier 520-b) and / or different component carriers (e.g., the first component carrier 520-a, the third component carrier 520-c) associated with the cancelled resource.

[0180] exist Figure 5In the example described, canceling the allocation associated with the second resource set 515-b effectively results in a gap in the allocated SRS resources in the frequency domain. Some wireless communication systems do not specify whether the UE 115 is expected to maintain phase coherence for SRS transmissions across the first resource set 515-a and the third resource set 515-c when the second resource set 515-b has been canceled.

[0181] Accordingly, the techniques described herein enable UE 115 to determine its phase coherence behavior for SRS transmission when a portion of an allocated SRS resource set (e.g., resource sets 415-b and 415-c) is cancelled, resulting in a time or frequency gap within the allocated SRS resource set. Specifically, the techniques described herein can enable SRS transmissions with varying degrees of phase coherence even when at least a portion of the SRS resources within a bundled SRS resource set has been cancelled or released.

[0182] For example, referring to resource allocation 505, UE 115 can receive an indication of a resource set 515 for transmitting a phase-coherent SRS set across corresponding component carriers 520 within time slot 510. For example, UE 115 can be configured with a first resource set 515-a associated with a first component carrier 520-a, a second resource set 515-b associated with a second component carrier 520-b, and a third resource set 515-c associated with a third component carrier 520-c. In this example, the first resource set 515-a, the second resource set 515-b, and / or the third resource set 515-c can be associated with shared phase coherence. Furthermore, the first component carrier 520-a, the second component carrier 520-b, and / or the third component carrier 520-c can include a set of frequency-adjacent component carriers 520. For example, the first, second, and third component carriers 520 may include a set of frequency-adjacent component carriers 520, wherein the second component carrier 520-b is located in the frequency domain between the first component carrier 520-a and the third component carrier 520-c.

[0183] Subsequently, UE 115 may receive a control message 525 (e.g., ULCI 525) instructing the cancellation of the allocation of the first portion of resource set 515. Figure 5 As shown, the first portion of resource set 515 associated with cancellation may be located within the second resource set 515-b in the second component carrier 520-b. Specifically, the first portion of resource set 515 associated with cancellation may include resources associated with symbols 7 and 8 within time slot 510.

[0184] In this example, UE 115 can determine the phase coherence configuration to be applied to transmitting SRS within the uncancelled SRS resources of resource allocation 505. For example, based on the determined phase coherence configuration, and given that the first portion of resource set 515 associated with cancellation is located within the second resource set 515-b, UE 115 can transmit at least one subset of the first SRS set using a first phase within the first component carrier 520-a, and can transmit at least one subset of the second SRS set using a second phase different from the first phase within the second component carrier 520-b. For example, UE 115 can transmit SRS using a first phase (e.g., first phase coherence) within the first resource set 515-a, and can transmit SRS using a second phase different from the first phase (e.g., second phase coherence) within symbols 9 and 10 of the second resource set 515-b. In other words, according to this example phase coherence configuration, as a result of canceling at least a subset of the resources associated with the second resource set 515-b within the second component carrier 520-b, UE 115 does not maintain phase coherence between at least a portion of the first resource set 515-a and the second resource set 515-b.

[0185] Similarly, based on the determined phase coherence configuration, and given that the first portion of resource set 515 associated with cancellation is located within the second resource set 515-b of the second component carrier 520-b, UE 115 can transmit at least a subset of the first SRS set using a first phase within the first component carrier 520-a, and at least a subset of the third SRS set using a phase different from the first phase within the third component carrier 520-c. For example, UE 115 can transmit SRS using a first phase (e.g., first phase coherence) within the first resource set 515-a, and can transmit SRS using a third phase (e.g., third phase coherence) different from the first phase within the third resource set 515-c. In other words, as a result of canceling at least a subset of the resources associated with the second resource set 515-b within the second component carrier 520-b, phase coherence between at least a portion of the first resource set 515-a and the third resource set 515-c may not be maintained.

[0186] Accordingly, in some aspects, the techniques described herein can be configured to maintain a certain level of phase coherence within the SRS transmitted across component carriers 520 in the frequency domain, depending on the appropriate positioning of the resources associated with cancellation.

[0187] Figure 6Examples of process flow 600 supporting techniques for SRS phase coherence according to various aspects of this disclosure are described. In some examples, process flow 600 may implement aspects of, or be implemented by, wireless communication system 100, wireless communication system 200, resource allocation scheme 300, 400 or 500, or any combination thereof. For example, process flow 600 may describe UE115-b: receiving an indication of a resource set allocated for SRS transmission, receiving cancellation of the allocation of at least a first portion of the resource set, determining a phase coherence configuration associated with a second portion of the resource set, and transmitting one or more SRSs according to the determined phase coherence configuration, as referred to Figure 1-5 As described, and other aspects. In some aspects, process flow 600 may include UE 115-b and base station 105-b, which may include, as referenced... Figure 1-5 Examples of UE 115 and base station 105 described.

[0188] In some examples, the operations described in process flow 600 may be performed by hardware (e.g., including circuit systems, processing blocks, logic components, and other components), code executed by a processor (e.g., software or firmware), or any combination thereof. Alternative examples are possible, in which some steps are performed in a different order than described or not at all. In some cases, steps may include additional features not mentioned below, or further steps may be added.

[0189] At 605, UE 115-b may transmit a capability report (e.g., a UE capability report) to base station 105-b. The capability report may indicate one or more parameters associated with SRS phase coherence at UE 115-b. For example, in some cases, the capability report may include indications of one or more phase coherence configurations supported by UE 115-b in cases where at least a subset of SRS resources is cancelled. For example, the capability report may indicate whether UE 115-b is able to maintain SRS phase coherence (e.g., strict phase coherence, where phase coherence is maintained or not maintained) in cases where a subset of SRS resources is cancelled, whether UE 115-b is able to maintain SRS phase coherence when certain conditions are met, whether UE 115-b is able to maintain SRS phase coherence with lenient requirements (e.g., lenient phase coherence), or any combination thereof.

[0190] The capability report may additionally or alternatively indicate other parameters for SRS phase coherence at UE 115-a. For example, the capability report may indicate one or more conditions that must be met for UE 115-b to maintain phase coherence. For instance, the capability report may indicate whether it can or cannot maintain phase coherence in different subsets of the SRS when other uplink transmissions are scheduled during an SRS resource gap caused by cancellation. As another example, the capability report may indicate whether it can or cannot maintain phase coherence in different subsets of the SRS when the time interval of the SRS resource gap caused by cancellation is greater than or less than a specific time interval threshold. In this example, the capability report may indicate a time interval threshold. As yet another example, the capability report may indicate a phase threshold that indicates UE 115-b is able to maintain SRS phase coherence within an indicated phase threshold for relaxed phase coherence.

[0191] At 610, base station 105-b may transmit control messages (e.g., RRC messages, DCI messages, MAC-CE messages) to UE 115-b. In some aspects, base station 105-b may transmit control messages based on a capability report received at 605. In some aspects, the control message may include an indication of which phase coherence configuration UE 115-b should utilize. For example, in the case where UE 115-b indicates at 605 via a capability report that it can apply multiple phase coherence configurations, base station 105-b may instruct UE 115-b to apply which phase coherence configuration via a control message at 610. By another example, the control message at 610 may indicate one or more parameters or characteristics associated with SRS phase coherence at UE 115-b, including a time interval threshold for the gap in SRS resources due to cancellation, a phase threshold for relaxed phase coherence, or any combination thereof.

[0192] At 615, base station 105-b may transmit to UE 115-b an indication of a resource set for transmitting a phase-coherent SRS set. In this regard, base station 105-b may indicate a time resource set, a frequency resource set, a spatial resource set, or any combination thereof, which can be used by UE 115-a to transmit a phase-coherent SRS set. The SRS resource set may be associated with periodic SRS, semi-periodic SRS, aperiodic SRS, or any combination thereof. In some aspects, the indication of the SRS resource set transmitted at 615 may be transmitted via control messages (e.g., DCI messages). For example, base station 105-b may indicate the SRS resource set at 615 via unicast DCI messages (e.g., UE-specific DCI messages), group-shared DCI messages (e.g., SRS carrier handover), or both. Base station 105-b may transmit the indication of the SRS resource set at 615 based on receiving a capability report at 605, transmitting a control message at 610, or both.

[0193] At 620, base station 105-b may transmit a control message indicating cancellation of the allocation of a first portion of the SRS resource set. In some cases, cancellation may be indicated via a ULCI message. Base station 105-b may transmit the cancellation indication based on receiving a capability report at 605, transmitting a control message (e.g., an RRC message) at 610, transmitting an indication of the SRS resource set at 615, or any combination thereof. For example, the capability report received at 605 may indicate that UE 115-b can maintain phase coherence if the time interval of the SRS resource gap caused by cancellation is less than a time interval threshold. In some cases, the indication of the SRS resource set indicated at 620 may additionally indicate that at least a subset of the SRS resource set is associated with TD-OCC. In this example, base station 105-b may indicate that the cancellation at 615 causes the time interval of the first portion of the SRS resource set (e.g., the cancelled portion) to be less than a time interval threshold, so that UE 115-b can maintain phase coherence across the transmitted SRS.

[0194] In some cases, the indications or parameters previously described as indicated in the control message at 610 may additionally or alternatively be used to indicate SRS resources at 615 (e.g., a DCI message), cancellation at 620 (e.g., ULCI), or both. For example, in some cases, base station 105-b may additionally indicate to UE 115-b which phase coherence configuration to utilize, along with the control message indicating the SRS resource set at 615 and / or indicating ULCI at 620. Additionally or alternatively, the control message indicating the SRS resource set and / or the control message indicating cancellation may include indications of one or more parameters associated with SRS phase coherence, including a time interval threshold for maintaining phase coherence, a phase threshold for relaxed phase coherence, or any combination thereof.

[0195] In 625, UE 115-b, base station 105-b, or both can determine the phase coherence configuration associated with the second portion (e.g., the uncancelled portion) of the SRS resource set. (See also...) Figure 2-5 Examples of various phase coherence configurations are discussed. UE115-b and / or base station 105-b can be configured to determine whether the intra-SRS phase coherence transmitted in the second part (e.g., the uncancelled part) of the SRS resource set when a portion of the SRS resource allocation has been cancelled should be fully maintained, maintained under certain conditions, maintained with lenient requirements, or lost (e.g., not maintained). In some aspects, UE115-b and / or base station 105-b can determine the phase coherence configuration based on a capability report at 605, a control message (e.g., an RRC message) at 610, an indication of the SRS resource set at 615, an indication of cancellation of the allocation of the first part at 620, or any combination thereof. In some examples, UE115-b and base station 105-b may each be encoded with the same phase coherence configuration, or base station 105-b may signal to UE115-b which phase coherence configuration to apply.

[0196] At 630, UE 115-b may transmit one or more SRSs within the second portion of the SRS resource set (e.g., the uncancelled portion). These one or more SRSs may include, but are not limited to, periodic SRSs, semi-periodic SRSs, aperiodic SRSs, or any combination thereof. In some aspects, based on the phase coherence configuration determined at 625, UE 115-b may transmit (and base station 105-b may receive) one or more SRSs at 630. Accordingly, based on the capability report at 605, the control message at 610, the indication to the SRS resource set at 615, the indication to cancellation at 620, the phase coherence configuration determined at 625, or any combination thereof, UE 115-b may transmit and base station 105-b may receive one or more SRSs at 630.

[0197] For example, UE 115-b can transmit a first phase-coherent SRS set and a second phase-coherent SRS set different from the first phase-coherent SRS set, depending on the determined phase coherence configuration. In some cases, the first phase-coherent SRS set can be transmitted in the time domain before the first portion of the SRS resource set associated with cancellation, and the second phase-coherent SRS set can be transmitted in the time domain after the first portion of the SRS resource set associated with cancellation. The phase coherence behavior of the first and second phase-coherent SRS sets can depend on the determined phase coherence configuration.

[0198] For example, according to a first phase coherence configuration, a first phase coherent SRS set and a second phase coherent SRS set can be transmitted using a shared phase coherence (e.g., maintaining phase coherence). By another example, according to a second phase coherence configuration, a first phase coherent SRS set and a second phase coherent SRS set can be transmitted using different phase coherence (e.g., not maintaining phase coherence).

[0199] By another example, according to a third phase coherence configuration, phase coherence can be maintained leniently if a first phase coherent SRS set is transmitted using a first phase and a second phase coherent SRS set is transmitted using a second phase different from the first phase, provided that the phase difference between the first and second phases satisfies a phase threshold. In some cases, the phase difference between the first and second phases satisfies the phase threshold if the phase difference is less than the phase threshold. In this regard, the first and second phase coherent SRS sets can be transmitted using different phases, but the corresponding phases are within a predefined phase threshold relative to each other (e.g., a phase difference of less than 10 degrees). In some aspects, the phase threshold can be indicated via a capability report at 605, a control message at 610, an indication of the SRS resource set at 610 (e.g., a DCI message), a cancellation at 615 (e.g., ULCI), or any combination thereof.

[0200] In some scenarios, according to the fourth phase coherence configuration, UE 115-b can transmit one or more SRSs with shared phase coherence at 630 (e.g., maintaining phase coherence) if certain conditions are met. For example, according to the fourth phase coherence configuration, UE 115-b can transmit a first SRS set and a second SRS set with shared phase coherence in a second part of the SRS resource set if the time interval of the first part of the SRS resource set associated with cancellation meets a time interval threshold, if no other transmissions (e.g., uplink transmissions) are scheduled within the first part of the resource set associated with cancellation, or both. For example, UE 115-b can transmit the first and second SRS sets if the time interval of the first part of the SRS resource set associated with cancellation is less than a time interval threshold. In this example, the time interval threshold can be indicated via a capability report at 605, a control message at 610, an indication of the SRS resource set at 610 (e.g., a DCI message), a cancellation at 615 (e.g., ULCI), or any combination thereof. By way of another example, UE 115-b can transmit the first and second SRS sets with shared phase coherence based on the uplink transmissions within the first part of the cancellation associated with the absence of the SRS resource set.

[0201] Depending on some additional phase coherence configurations, UE 115-b can transmit (or suppress transmission) SRS within a second portion of an SRS resource set associated with TD-OCC. Specifically, in the case where the first portion of the SRS resource set associated with cancellation is associated with TD-OCC, UE 115-b can suppress the transmission of SRS within other SRS resources associated with TD-OCC, and can transmit SRS within other SRS resources not associated with TD-OCC. For example, in some cases, the first portion of the SRS resource set associated with cancellation may be associated with TD-OCC. In this example, UE 115-b can transmit one or more SRSs that are not associated with TD-OCC, and can suppress the transmission of one or more additional SRSs that are associated with TD-OCC.

[0202] In some scenarios, depending on the additional phase coherence configuration, UE 115-b can transmit one or more SRSs in the frequency domain with or without maintaining phase coherence across one or more SRSs. Specifically, maintaining or not maintaining phase coherence in the frequency domain can be based on the relative positioning of a first portion of the SRS resource set in the frequency domain, as referred to herein. Figure 2 and 5A more detailed description follows.

[0203] At 635, base station 105-b can determine a channel estimate associated with the channel between UE 115-b and base station 105-b. In some aspects, base station 105-b can determine the channel estimate at 635 based on one or more SRS received from UE 115-b at 630. For example, base station 105-b can perform one or more measurements (e.g., RSSI measurement, RSRP measurement, RSRQ measurement, SNR measurement, SINR measurement) on the one or more SRS received at 630, and can determine the channel estimate at 635 based on the performed measurements.

[0204] In some aspects, base station 105-b can be configured to employ different channel estimation techniques based on the relative phase coherence of the SRS received at 630. For example, base station 105-b can receive a first set of phase-coherent SRSs and a second set of phase-coherent SRSs different from the first set of phase-coherent SRSs. In the case where the first set of phase-coherent SRSs is associated with a first phase and the second set of phase-coherent SRSs is associated with a second phase different from the first phase, base station 105-b can be configured to perform channel estimation by performing additive combination within the respective set of phase-coherent SRSs. However, in this case, due to the different phases associated with the first and second sets of phase-coherent SRSs, additive combination may not be possible across the first and second sets of phase-coherent SRSs. Conversely, in the case where the first and second sets of phase-coherent SRSs are transmitted / received using a shared phase, base station 105-b can be configured to perform channel estimation by performing additive combination within and / or across the respective sets of phase-coherent SRSs.

[0205] At 640, base station 105-b can determine a precoder associated with downlink transmission. In this regard, base station 105-b can determine a precoder that can be used to transmit downlink transmission to UE 115-b. In some aspects, base station 105-b can determine the precoder based on the channel estimate determined at 635.

[0206] At 645, base station 105-b can transmit downlink transmissions to UE 115-b. In some aspects, base station 105-b can transmit downlink transmissions at 645 based on (e.g., according to) the precoder determined at 640. In this regard, base station 105-b can transmit downlink transmissions at 645 based on the channel estimate determined at 635.

[0207] At 650, UE 115-b can transmit uplink data to base station 105-b. At 655, base station 105-b can demodulate the uplink data. In some aspects, base station 105-b can demodulate the uplink data based on the channel estimate determined at 635.

[0208] The techniques described herein enable SRS transmission with varying degrees of phase coherence even when at least a portion of the SRS resources within a bundled SRS resource set have been cancelled or released. Specifically, by supporting multiple different phase coherence configurations, the techniques described herein allow wireless devices (e.g., UE 115-b, base station 105-b) within a wireless communication system (e.g., wireless communication systems 100, 200) to maintain a certain degree of phase coherence based on the corresponding capabilities of UE 115 within that wireless communication system. Furthermore, by supporting the defined phase coherence configurations, the techniques described herein can improve the phase coherence of SRS signals even when at least a subset of the SRS resources has been cancelled or released, thereby achieving more accurate channel estimation and improving the efficiency and reliability of wireless communication within the wireless communication system.

[0209] Figure 7 A block diagram 700 of a device 705 supporting techniques for SRS phase coherence according to various aspects of this disclosure is shown. Device 705 may be an example of various aspects of UE 115 as described herein. Device 705 may include a receiver 710, a transmitter 715, and a communication 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).

[0210] 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 related to techniques for SRS phase coherence). The information may be transmitted to other components of device 705. Receiver 710 may utilize a single antenna or a collection of antennas.

[0211] 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 associated with various information channels (e.g., control channels, data channels, information channels related to techniques for SRS phase coherence), user data, control information, or any combination thereof. 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.

[0212] The communication manager 720, receiver 710, transmitter 715, or various combinations thereof, or various components thereof, may be examples of apparatuses for performing various aspects of the techniques for SRS phase coherence as described herein. For example, the communication manager 720, receiver 710, transmitter 715, or various combinations thereof, or components thereof, may support methods for performing one or more functions described herein.

[0213] In some examples, the communication manager 720, receiver 710, transmitter 715, 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 functions described herein (e.g., by executing instructions stored in memory by the processor).

[0214] Additionally or alternatively, in some examples, the communication manager 720, receiver 710, transmitter 715, 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 720, receiver 710, transmitter 715, 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).

[0215] In some examples, the communication manager 720 may be configured to use or otherwise cooperate with the receiver 710, transmitter 715, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, the communication manager 720 may receive information from the receiver 710, send information to the transmitter 715, or be integrated with the receiver 710, transmitter 715, or both to receive information, transmit information, or perform various other operations described herein.

[0216] The communication manager 720 may support wireless communication at the UE according to the examples disclosed herein. For example, the communication manager 720 may be configured or otherwise supported to provide means for receiving from a base station an indication of a resource set for transmitting a set of multiple phase-coherent SRSs. The communication manager 720 may be configured or otherwise supported to provide means for receiving from the base station a control message indicating cancellation of the allocation of a first portion of the resource set. The communication manager 720 may be configured or otherwise supported to provide means for determining a phase-coherence configuration associated with a second portion of the resource set based on receiving the control message indicating the cancellation. The communication manager 720 may be configured or otherwise supported to provide means for transmitting one or more SRSs within the second portion of the resource set according to the determined phase-coherence configuration.

[0217] By including or configuring a communication manager 720 according to the example described herein, device 705 (e.g., a processor that controls or otherwise couples to receiver 710, transmitter 715, communication manager 720, or a combination thereof) can support techniques for maintaining varying degrees of SRS phase coherence in cases where at least a portion of the SRS resources within a bundled set of SRS resources has been cancelled or released. By supporting defined phase coherence configurations, the techniques described herein can improve the phase coherence of SRS signals in cases where at least a subset of SRS resources has been cancelled or released, thereby achieving more accurate channel estimation. In this regard, by achieving more accurate channel estimation, the efficiency and reliability of wireless communication within a wireless communication system can be improved, thereby reducing the amount of retransmissions that may be performed, which in turn improves resource utilization at UE 115, reduces power consumption, and improves battery performance.

[0218] Figure 8 A block diagram 800 of a device 805 supporting techniques for SRS phase coherence according to various aspects of this disclosure is shown. Device 805 may be an example of aspects of device 705 or UE 115 as described herein. Device 805 may include a receiver 810, a transmitter 815, and a communication manager 820. Device 805 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0219] Receiver 810 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 related to techniques for SRS phase coherence). The information may be transmitted to other components of device 805. Receiver 810 may utilize a single antenna or a collection of antennas.

[0220] Transmitter 815 may provide means for transmitting signals generated by other components of device 805. For example, transmitter 815 may transmit information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to techniques for SRS phase coherence), user data, control information, or any combination thereof. In some examples, transmitter 815 may be co-located with receiver 810 in a transceiver module. Transmitter 815 may utilize a single antenna or a collection of multiple antennas.

[0221] Device 805 or its various components may be examples of means for performing various aspects of the techniques for SRS phase coherence as described herein. For example, communication manager 820 may include SRS resource receiver manager 825, control message receiver manager 830, phase coherence manager 835, SRS transmission manager 840, or any combination thereof. Communication manager 820 may be examples of various aspects of communication manager 720 as described herein. In some examples, communication manager 820 or its various components may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using receiver 810, transmitter 815, or both, or otherwise cooperating with receiver 810, transmitter 815, or both. For example, communication manager 820 may receive information from receiver 810, send information to transmitter 815, or be integrated in combination with receiver 810, transmitter 815, or both to receive information, transmit information, or perform various other operations described herein.

[0222] Communication manager 820 may support wireless communication at the UE according to the examples disclosed herein. SRS resource reception manager 825 may be configured or otherwise supported to receive from a base station an indication of a resource set for transmitting a set of multiple phase-coherent SRSs. Control message reception manager 830 may be configured or otherwise supported to receive from the base station a control message indicating cancellation of the allocation of a first portion of the resource set. Phase coherence manager 835 may be configured or otherwise supported to determine a phase coherence configuration associated with a second portion of the resource set based on the received control message indicating the cancellation. SRS transmission manager 840 may be configured or otherwise supported to transmit one or more SRSs within the second portion of the resource set according to the determined phase coherence configuration.

[0223] Figure 9A block diagram 900 is shown of a communication manager 920 supporting techniques for SRS phase coherence according to various aspects of this disclosure. The communication manager 920 may be an example of aspects of the communication manager 720, communication manager 820, or both described herein. The communication manager 920 or its various components may be examples of means for implementing various aspects of the techniques for SRS phase coherence as described herein. For example, the communication manager 920 may include an SRS resource receiving manager 925, a control message receiving manager 930, a phase coherence manager 935, an SRS transmission manager 940, a capability report transmission manager 945, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0224] Communication manager 920 may support wireless communication at the UE according to the examples disclosed herein. SRS resource receiving manager 925 may be configured or otherwise supported to receive from a base station an indication of a resource set for transmitting a set of multiple phase-coherent SRSs. Control message receiving manager 930 may be configured or otherwise supported to receive from the base station a control message indicating cancellation of the allocation of a first portion of the resource set. Phase coherence manager 935 may be configured or otherwise supported to determine a phase coherence configuration associated with a second portion of the resource set based on the received control message indicating the cancellation. SRS transmission manager 940 may be configured or otherwise supported to transmit one or more SRSs within the second portion of the resource set according to the determined phase coherence configuration.

[0225] In some examples, to support the transmission of one or more SRSs within a second portion of the resource set, the SRS transmission manager 940 may be configured or otherwise support means for transmitting a first phase-coherent SRS set. In some examples, to support the transmission of one or more SRSs within a second portion of the resource set, the SRS transmission manager 940 may be configured or otherwise support means for transmitting a second phase-coherent SRS set different from the first phase-coherent SRS set.

[0226] In some examples, the SRS transmission manager 940 may be configured or otherwise supported for means of transmitting a first phase-coherent SRS set in the time domain before the first portion of the resource set associated with cancellation. In some examples, the SRS transmission manager 940 may be configured or otherwise supported for means of transmitting a second phase-coherent SRS set in the time domain after the first portion of the resource set associated with cancellation.

[0227] In some examples, the SRS transmission manager 940 may be configured or otherwise support means for transmitting a first-phase coherent SRS set associated with a first phase. In some examples, the SRS transmission manager 940 may be configured or otherwise support means for transmitting a second-phase coherent SRS set associated with a second phase different from the first phase.

[0228] In some examples, to support the transmission of one or more SRSs within a second portion of a resource set, the SRS transmission manager 940 may be configured or otherwise support means for transmitting a first SRS set and a second SRS set different from the first SRS set using shared phase coherence based on time intervals of the first portion of the resource set associated with cancellation meeting time interval thresholds.

[0229] In some examples, the time interval of the first part of the resource set associated with cancellation satisfies the time interval threshold if the time interval is less than the time interval threshold.

[0230] In some examples, the control message receiving manager 930 may be configured or otherwise supported to receive a second control message from the base station, including an indication of a threshold for the time interval, wherein the transmission of the first SRS set and the second SRS set with shared phase coherence is based on the receipt of the second control message.

[0231] In some examples, the SRS transmission manager 940 may be configured or otherwise support means for transmitting a first SRS set and a second SRS set different from the first SRS set using shared phase coherence for uplink transmissions within a first portion of the schedule associated with cancellation based on an identifier of a non-existent resource set.

[0232] In some examples, to support the transmission of one or more SRSs within a second portion of a resource set, the SRS transmission manager 940 may be configured or otherwise support means for transmitting a first SRS set and a second SRS set different from the first SRS set using shared phase coherence based on uplink transmissions within a first portion that are associated with cancellation and identify a resource set that does not exist.

[0233] In some examples, in order to support multiple phase-coherent SRS sets, the SRS transmission manager 940 may be configured or otherwise support means for a first SRS set associated with a first component carrier and a second SRS set associated with a second component carrier, wherein the first SRS set and the second SRS set are associated with shared phase coherence.

[0234] In some examples, in order to support the transmission of one or more SRSs, the SRS transmission manager 940 may be configured or otherwise support means for transmitting at least one subset of the first SRS set with a first phase and transmitting at least one subset of the second SRS set with a second phase different from the first phase, based on a first portion of the resource set associated with cancellation located within the second SRS set.

[0235] In some examples, the first component carrier and the second component carrier comprise a set of frequency-adjacent component carriers.

[0236] In some examples, the set of multiple phase-coherent SRSs further includes a third set of SRSs associated with a third component carrier. In some examples, the third set of SRSs is associated with shared phase coherence associated with the first and second sets of SRSs.

[0237] In some examples, in order to support the transmission of one or more SRSs, the SRS transmission manager 940 may be configured or otherwise support means for transmitting at least one subset of the first SRS set with a first phase and transmitting at least one subset of the third SRS set with a second phase different from the first phase, based on a first portion of the resource set associated with cancellation located within the second SRS set.

[0238] In some examples, to support the transmission of one or more SRSs within a second portion of the resource set, the SRS transmission manager 940 may be configured or otherwise support means for transmitting a first-phase coherent SRS set with a first phase. In some examples, to support the transmission of one or more SRSs within a second portion of the resource set, the SRS transmission manager 940 may be configured or otherwise support means for transmitting a second-phase coherent SRS set with a second phase different from the first phase, wherein the phase difference between the first phase and the second phase satisfies a phase threshold.

[0239] In some examples, the phase difference between the first phase and the second phase satisfies the phase threshold if the phase difference is less than the phase threshold.

[0240] In some examples, the capability report transmission manager 945 may be configured or otherwise support means for transmitting a UE capability report to the base station, including an indication of the phase threshold, wherein the transmission of the first phase coherent SRS set and the second phase coherent SRS set is based on the transmission of the UE capability report.

[0241] In some examples, the capability report transmission manager 945 may be configured or otherwise support means for transmitting a UE capability report to the base station, the UE capability report including indications of one or more phase coherence configurations supported by the UE, wherein the transmission of the one or more SRSs is based on the transmission of the UE capability report.

[0242] In some examples, control messages include ULCI messages.

[0243] In some examples, in order to support the transmission of one or more SRSs, the SRS transmission manager 940 may be configured or otherwise support means for transmitting one or more SRSs that are not associated with TD-OCC.

[0244] In some examples, the SRS transmission manager 940 may be configured or otherwise support means for suppressing the transmission of one or more additional SRS associated with the TD-OCC based on one or more additional SRS associated with the second part of the resource set.

[0245] In some examples, the set of multiple phase-coherent SRSs includes periodic SRSs, semi-periodic SRSs, aperiodic SRSs, or any combination thereof.

[0246] In some examples, the control message receiving manager 930 may be configured or otherwise supported to receive unicast DCI messages, group shared DCI messages, or both from the base station, wherein an indication of a resource set for transmitting the set of the plurality of phase coherent SRSs is received via the unicast DCI message, the group shared DCI message, or both.

[0247] Figure 10 A diagram of a system 1000 including a device 1005 supporting technology for SRS phase coherence is shown according to various aspects of this disclosure. Device 1005 may be an example of device 705, device 805, or UE 115 as described herein, or a component including device 705, device 805, or UE 115. Device 1005 may wirelessly communicate with one or more base stations 105, UE 115, or any combination thereof. Device 1005 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communication manager 1020, an input / output (I / O) controller 1010, a transceiver 1015, an antenna 1025, a memory 1030, a code 1035, and a processor 1040. 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 1045).

[0248] I / O controller 1010 manages the input and output signals of device 1005. I / O controller 1010 can also manage peripheral devices not integrated into device 1005. In some cases, I / O controller 1010 may represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1010 may utilize an operating system, such as... Or another known operating system. Additionally or alternatively, the I / O controller 1010 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, the I / O controller 1010 may be implemented as part of a processor (such as processor 1040). In some cases, a user may interact with device 1005 via the I / O controller 1010 or via hardware components controlled by the I / O controller 1010.

[0249] In some cases, device 1005 may include a single antenna 1025. However, in other cases, device 1005 may have more than one antenna 1025, which may be capable of transmitting or receiving multiple wireless transmissions concurrently. Transceiver 1015 may communicate bidirectionally via one or more antennas 1025, wired or wireless links, as described herein. For example, transceiver 1015 may represent a wireless transceiver and be capable of bidirectional communication with another wireless transceiver. Transceiver 1015 may also include a modem for modulating packets and providing modulated packets to one or more antennas 1025 for transmission, and for demodulating packets received from one or more antennas 1025. Transceiver 1015, or transceiver 1015 and one or more antennas 1025, may be an example of transmitter 715, transmitter 815, receiver 710, receiver 810, or any combination thereof or components thereof as described herein.

[0250] Memory 1030 may include random access memory (RAM) and read-only memory (ROM). Memory 1030 may store computer-readable, computer-executable code 1035, including instructions that, when executed by processor 1040, cause device 1005 to perform the various functions described herein. Code 1035 may be stored in a non-transitory computer-readable medium, such as system memory or another type of memory. In some cases, code 1035 may not be directly executable by processor 1040, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, memory 1030 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.

[0251] Processor 1040 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 1040 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 1040. Processor 1040 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1030) to cause device 1005 to perform various functions (e.g., functions or tasks supporting techniques for SRS phase coherence). For example, device 1005 or components thereof may include processor 1040 and memory 1030 coupled to processor 1040, wherein processor 1040 and memory 1030 are configured to perform the various functions described herein.

[0252] The communication manager 1020 may support wireless communication at the UE according to the examples disclosed herein. For example, the communication manager 1020 may be configured or otherwise supported to provide means for receiving from a base station an indication of a resource set for transmitting a set of multiple phase-coherent SRSs. The communication manager 1020 may be configured or otherwise supported to provide means for receiving from the base station a control message indicating cancellation of the allocation of a first portion of the resource set. The communication manager 1020 may be configured or otherwise supported to provide means for determining a phase-coherence configuration associated with a second portion of the resource set based on receiving the control message indicating the cancellation. The communication manager 1020 may be configured or otherwise supported to provide means for transmitting one or more SRSs within the second portion of the resource set according to the determined phase-coherence configuration.

[0253] By including or configuring a communication manager 1020 according to the example described herein, device 1005 can support techniques for maintaining varying degrees of SRS phase coherence in cases where at least a portion of the SRS resources within a bundled SRS resource set has been cancelled or released. By supporting the defined phase coherence configuration, the techniques described herein can improve the phase coherence of the SRS signal in cases where at least a subset of the SRS resources has been cancelled or released, thereby achieving more accurate channel estimation. In this regard, by achieving more accurate channel estimation, the efficiency and reliability of wireless communication within the wireless communication system can be improved, thereby reducing the amount of retransmissions that may be performed, which in turn improves resource utilization at UE 115, reduces power consumption, and improves battery performance.

[0254] In some examples, the communication manager 1020 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise cooperating with the transceiver 1015, one or more antennas 1025, or any combination thereof. Although the communication manager 1020 is described as a separate component, in some examples, one or more functions described with reference to the communication manager 1020 may be supported or executed by the processor 1040, memory 1030, code 1035, or any combination thereof. For example, code 1035 may include instructions that can be executed by the processor 1040 to cause the device 1005 to perform various aspects of the techniques for SRS phase coherence as described herein, or the processor 1040 and memory 1030 may be otherwise configured to perform or support such operations.

[0255] Figure 11 A block diagram 1100 of an apparatus 1105 supporting techniques for SRS phase coherence according to aspects of this disclosure is shown. Apparatus 1105 may be an example of aspects of base station 105 as described herein. Apparatus 1105 may include a receiver 1110, a transmitter 1115, and a communication manager 1120. Apparatus 1105 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0256] 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 related to techniques for SRS phase coherence). The information may be transmitted to other components of device 1105. Receiver 1110 may utilize a single antenna or a collection of antennas.

[0257] 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 associated with various information channels (e.g., control channels, data channels, information channels related to techniques for SRS phase coherence), user data, control information, or any combination thereof. 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.

[0258] The communication manager 1120, receiver 1110, transmitter 1115, or various combinations thereof, or various components thereof, may be examples of apparatuses for performing various aspects of the techniques for SRS phase coherence as described herein. For example, the communication manager 1120, receiver 1110, transmitter 1115, or various combinations thereof, or components thereof, may support methods for performing one or more functions described herein.

[0259] In some examples, the communication manager 1120, receiver 1110, transmitter 1115, 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 to 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).

[0260] Additionally or alternatively, in some examples, the communication manager 1120, receiver 1110, transmitter 1115, 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 1120, receiver 1110, transmitter 1115, 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).

[0261] In some examples, the communication manager 1120 may be configured to use or otherwise cooperate with the receiver 1110, transmitter 1115, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, the communication manager 1120 may receive information from the receiver 1110, send information to the transmitter 1115, or be integrated with the receiver 1110, transmitter 1115, or both to receive information, transmit information, or perform various other operations described herein.

[0262] Communication manager 1120 may support wireless communication at a base station according to the examples disclosed herein. For example, communication manager 1120 may be configured or otherwise supported to transmit to a UE an indication of a resource set for transmitting a set of multiple phase-coherent SRSs. Communication manager 1120 may be configured or otherwise supported to transmit to the UE a control message indicating cancellation of the allocation of a first portion of the resource set. Communication manager 1120 may be configured or otherwise supported to determine a phase-coherence configuration associated with a second portion of the resource set based on the transmission of the control message indicating the cancellation. Communication manager 1120 may be configured or otherwise supported to receive one or more SRSs from the UE within the second portion of the resource set according to the determined phase-coherence configuration.

[0263] By including or configuring a communication manager 1120 according to the example described herein, device 1105 (e.g., a processor that controls or is otherwise coupled to receiver 1110, transmitter 1115, communication manager 1120, or a combination thereof) can support techniques for maintaining varying degrees of SRS phase coherence in cases where at least a portion of the SRS resources within a bundled set of SRS resources has been cancelled or released. By supporting defined phase coherence configurations, the techniques described herein can improve the phase coherence of SRS signals in cases where at least a subset of SRS resources has been cancelled or released, thereby achieving more accurate channel estimation. In this regard, by achieving more accurate channel estimation, the efficiency and reliability of wireless communication within a wireless communication system can be improved, thereby reducing the amount of retransmissions that may be performed, which in turn improves resource utilization at base station 105 and reduces power consumption.

[0264] Figure 12 A block diagram 1200 of a device 1205 supporting techniques for SRS phase coherence according to aspects of this disclosure is shown. Device 1205 may be an example of aspects of device 1105 or base station 105 as described herein. Device 1205 may include a receiver 1210, a transmitter 1215, and a communication manager 1220. Device 1205 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0265] Receiver 1210 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 related to techniques for SRS phase coherence). The information may be transmitted to other components of device 1205. Receiver 1210 may utilize a single antenna or a collection of antennas.

[0266] Transmitter 1215 may provide means for transmitting signals generated by other components of device 1205. For example, transmitter 1215 may transmit information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to techniques for SRS phase coherence), user data, control information, or any combination thereof. In some examples, transmitter 1215 may be co-located with receiver 1210 in a transceiver module. Transmitter 1215 may utilize a single antenna or a collection of multiple antennas.

[0267] Device 1205 or its various components may be examples of means for performing various aspects of the techniques for SRS phase coherence as described herein. For example, communication manager 1220 may include SRS resource transfer manager 1225, control message transfer manager 1230, phase coherence manager 1235, SRS receiver manager 1240, or any combination thereof. Communication manager 1220 may be examples of various aspects of communication manager 1120 as described herein. In some examples, communication manager 1220 or its various components may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using receiver 1210, transmitter 1215, or both, or otherwise in cooperation with receiver 1210, transmitter 1215, or both. For example, communication manager 1220 may receive information from receiver 1210, send information to transmitter 1215, or be integrated in combination with receiver 1210, transmitter 1215, or both to receive information, transmit information, or perform various other operations described herein.

[0268] Communication manager 1220 may support wireless communication at a base station according to the examples disclosed herein. SRS resource transmission manager 1225 may be configured or otherwise supported to transmit to the UE an indication of a resource set for transmitting a set of multiple phase-coherent SRSs. Control message transmission manager 1230 may be configured or otherwise supported to transmit to the UE a control message indicating cancellation of the allocation of a first portion of the resource set. Phase coherence manager 1235 may be configured or otherwise supported to determine a phase coherence configuration associated with a second portion of the resource set based on the transmission of the control message indicating the cancellation. SRS reception manager 1240 may be configured or otherwise supported to receive one or more SRSs from the UE within the second portion of the resource set according to the determined phase coherence configuration.

[0269] Figure 13A block diagram 1300 of a communication manager 1320 supporting techniques for SRS phase coherence according to various aspects of this disclosure is shown. The communication manager 1320 may be an example of aspects of the communication manager 1120, communication manager 1220, or both described herein. The communication manager 1320 or its various components may be examples of means for implementing various aspects of the techniques for SRS phase coherence as described herein. For example, the communication manager 1320 may include an SRS resource transmission manager 1325, a control message transmission manager 1330, a phase coherence manager 1335, an SRS receiver manager 1340, a capability report receiver manager 1345, a channel estimation manager 1350, an uplink receiver manager 1355, a downlink precoder manager 1360, a downlink transmission manager 1365, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0270] Communication manager 1320 may support wireless communication at a base station according to the examples disclosed herein. SRS resource transmission manager 1325 may be configured or otherwise supported to transmit to the UE an indication of a resource set for transmitting a set of multiple phase-coherent SRSs. Control message transmission manager 1330 may be configured or otherwise supported to transmit to the UE a control message indicating cancellation of the allocation of a first portion of the resource set. Phase coherence manager 1335 may be configured or otherwise supported to determine a phase coherence configuration associated with a second portion of the resource set based on the transmission of the control message indicating the cancellation. SRS reception manager 1340 may be configured or otherwise supported to receive one or more SRSs from the UE within the second portion of the resource set according to the determined phase coherence configuration.

[0271] In some examples, to support the reception of one or more SRSs within a second portion of the resource set, the SRS reception manager 1340 may be configured or otherwise support means for receiving a first set of phase-coherent SRSs. In some examples, to support the reception of one or more SRSs within a second portion of the resource set, the SRS reception manager 1340 may be configured or otherwise support means for receiving a second set of phase-coherent SRSs different from the first set of phase-coherent SRSs.

[0272] In some examples, the SRS receiver manager 1340 may be configured or otherwise supported for means of receiving a first set of phase-coherent SRSs in the time domain before the first portion of the resource set associated with cancellation. In some examples, the SRS receiver manager 1340 may be configured or otherwise supported for receiving a second set of phase-coherent SRSs in the time domain after the first portion of the resource set associated with cancellation.

[0273] In some examples, the SRS receiver manager 1340 may be configured or otherwise support means for receiving a first phase coherent SRS set associated with a first phase. In some examples, the SRS receiver manager 1340 may be configured or otherwise support means for receiving a second phase coherent SRS set associated with a second phase different from the first phase.

[0274] In some examples, to support the reception of one or more SRSs within a second portion of a resource set, the SRS reception manager 1340 may be configured or otherwise supported to receive a first set of SRSs and a second set of SRSs different from the first set of SRSs with shared phase coherence based on time intervals of the first portion of the resource set associated with cancellation meeting time interval thresholds.

[0275] In some examples, the time interval of the first part of the resource set associated with cancellation satisfies the time interval threshold if the time interval is less than the time interval threshold.

[0276] In some examples, the control message transmission manager 1330 may be configured or otherwise supported to transmit a second control message to the UE, including an indication of a time interval threshold, wherein receiving the first SRS set and the second SRS set with shared phase coherence is based on transmitting the second control message.

[0277] In some examples, the SRS receiver manager 1340 may be configured or otherwise support means for receiving a first SRS set and a second SRS set different from the first SRS set with shared phase coherence based on uplink transmissions within a first portion of the schedule associated with cancellation, which identifies a resource set that does not exist.

[0278] In some examples, to support receiving one or more SRSs within a second portion of a resource set, the SRS receiving manager 1340 may be configured or otherwise supported to receive a first SRS set and a second SRS set different from the first SRS set with shared phase coherence based on uplink transmissions within a first portion that identify a resource set that is canceled.

[0279] In some examples, in order to support multiple phase-coherent SRS sets, the SRS receiver manager 1340 may be configured or otherwise support means for a first SRS set associated with a first component carrier and a second SRS set associated with a second component carrier, wherein the first SRS set and the second SRS set are associated with shared phase coherence.

[0280] In some examples, in order to support the reception of one or more SRSs, the SRS reception manager 1340 may be configured or otherwise support means for receiving at least one subset of the first SRS set with a first phase and receiving at least one subset of the second SRS set with a second phase different from the first phase, based on a first portion of the resource set associated with cancellation located within the second SRS set.

[0281] In some examples, the first component carrier and the second component carrier comprise a set of frequency-adjacent component carriers.

[0282] In some examples, the set of multiple phase-coherent SRSs further includes a third set of SRSs associated with a third component carrier. In some examples, the third set of SRSs is associated with shared phase coherence associated with the first and second sets of SRSs.

[0283] In some examples, in order to support the reception of one or more SRSs, the SRS reception manager 1340 may be configured or otherwise support means for receiving at least a subset of a first SRS set with a first phase and receiving at least a subset of a third SRS set with a second phase different from the first phase, based on a first portion of the resource set associated with cancellation located within a second SRS set.

[0284] In some examples, to support the reception of one or more SRSs within a second portion of the resource set, the SRS receiver manager 1340 may be configured or otherwise support means for receiving a first-phase coherent SRS set with a first phase. In some examples, to support the reception of one or more SRSs within a second portion of the resource set, the SRS receiver manager 1340 may be configured or otherwise support means for receiving a second-phase coherent SRS set with a second phase different from the first phase, wherein the phase difference between the first and second phases satisfies a phase threshold.

[0285] In some examples, the phase difference between the first phase and the second phase satisfies the phase threshold if the phase difference is less than the phase threshold.

[0286] In some examples, the capability report receiving manager 1345 may be configured or otherwise supported for means of receiving a UE capability report from the UE, including an indication of a phase threshold, wherein receiving a first phase coherent SRS set and a second phase coherent SRS set is based on receiving the UE capability report.

[0287] In some examples, the capability report receiving manager 1345 may be configured or otherwise support means for receiving a UE capability report from a UE, the UE capability report including indications of one or more phase coherence configurations supported by the UE, wherein receiving the one or more SRSs is based on receiving the UE capability report.

[0288] In some examples, control messages include ULCI messages.

[0289] In some examples, in order to support the reception of one or more SRSs, the SRS reception manager 1340 may be configured or otherwise supported for means of receiving one or more SRSs that are not associated with TD-OCC.

[0290] In some examples, the SRS receiver manager 1340 may be configured or otherwise support means for suppressing the reception of one or more additional SRS associated with the TD-OCC based on one or more additional SRS associated with the second part of the resource set.

[0291] In some examples, the set of multiple phase-coherent SRSs includes periodic SRSs, semi-periodic SRSs, aperiodic SRSs, or any combination thereof.

[0292] In some examples, the control message delivery manager 1330 may be configured or otherwise support means for transmitting unicast DCI messages, group shared DCI messages, or both to the UE, wherein an indication of a resource set for transmitting a set of multiple phase-coherent SRSs is transmitted via the unicast DCI message, the group shared DCI message, or both.

[0293] In some examples, the channel estimation manager 1350 may be configured or otherwise support means for determining a channel estimate associated with the channel between the UE and the base station based on the receipt of one or more SRS.

[0294] In some examples, to support the reception of one or more SRSs within a second portion of the resource set, the SRS reception manager 1340 may be configured or otherwise support means for receiving a first phase-coherent SRS set. In some examples, to support the reception of one or more SRSs within a second portion of the resource set, the SRS reception manager 1340 may be configured or otherwise support means for receiving a second phase-coherent SRS set different from the first phase-coherent SRS set, wherein the channel estimation is determined based on the first phase-coherent SRS set, the second phase-coherent SRS set, or both.

[0295] In some examples, the uplink receive manager 1355 may be configured or otherwise support means for receiving uplink transmissions from the UE. In some examples, the uplink receive manager 1355 may be configured or otherwise support means for demodulating uplink transmissions based on a determined channel estimate.

[0296] In some examples, the downlink precoder manager 1360 may be configured or otherwise supported to provide means for determining a precoder associated with a downlink transmission based on a determined channel estimate. In some examples, the downlink transmission manager 1365 may be configured or otherwise supported to provide means for transmitting downlink transmissions to the UE based on the determined precoder.

[0297] Figure 14 A diagram of a system 1400 including device 1405 supporting techniques for SRS phase coherence according to aspects of this disclosure is shown. Device 1405 may be an example of device 1105, device 1205, or base station 105 as described herein, or a component including such devices. Device 1405 may wirelessly communicate with one or more base stations 105, UE 115, or any combination thereof. Device 1405 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communication manager 1420, a network communication manager 1410, a transceiver 1415, an antenna 1425, a memory 1430, code 1435, a processor 1440, and an inter-station communication manager 1445. 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 1450).

[0298] The network communication manager 1410 can manage communication with the core network 130 (e.g., via one or more wired backhaul links). For example, the network communication manager 1410 can manage the delivery of data communication to client devices (such as one or more UEs 115).

[0299] In some cases, device 1405 may include a single antenna 1425. However, in other cases, device 1405 may have more than one antenna 1425, which may be capable of transmitting or receiving multiple wireless transmissions concurrently. Transceiver 1415 may communicate bidirectionally via one or more antennas 1425, wired or wireless links, as described herein. For example, transceiver 1415 may represent a wireless transceiver and be capable of bidirectional communication with another wireless transceiver. Transceiver 1415 may also include a modem for modulating packets and providing modulated packets to one or more antennas 1425 for transmission, and for demodulating packets received from one or more antennas 1425. Transceiver 1415, or transceiver 1415 and one or more antennas 1425, may be an example of transmitter 1115, transmitter 1215, receiver 1110, receiver 1210, or any combination thereof or components thereof as described herein.

[0300] Memory 1430 may include RAM and ROM. Memory 1430 may store computer-readable, computer-executable code 1435, including instructions that, when executed by processor 1440, cause device 1405 to perform the various functions described herein. Code 1435 may be stored in a non-transitory computer-readable medium, such as system memory or another type of memory. In some cases, code 1435 may not be directly executable by processor 1440, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, memory 1430 may, in particular, include a BIOS that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0301] Processor 1440 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 1440 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 1440. Processor 1440 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1430) to cause device 1405 to perform various functions (e.g., functions or tasks supporting techniques for SRS phase coherence). For example, device 1405 or components thereof may include processor 1440 and memory 1430 coupled to processor 1440, wherein processor 1440 and memory 1430 are configured to perform the various functions described herein.

[0302] Inter-site communication manager 1445 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 1445 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 1445 may provide an X2 interface within LTE / LTE-A wireless communication network technology to facilitate communication between base stations 105.

[0303] Communication manager 1420 may support wireless communication at a base station according to the examples disclosed herein. For example, communication manager 1420 may be configured or otherwise supported to provide means for transmitting to a UE an indication of a resource set for transmitting a set of multiple phase-coherent SRSs. Communication manager 1420 may be configured or otherwise supported to provide to the UE means for transmitting a control message indicating cancellation of the allocation of a first portion of the resource set. Communication manager 1420 may be configured or otherwise supported to provide means for determining a phase-coherence configuration associated with a second portion of the resource set based on the transmission of the control message indicating the cancellation. Communication manager 1420 may be configured or otherwise supported to provide means for receiving one or more SRSs from the UE within the second portion of the resource set according to the determined phase-coherence configuration.

[0304] By including or configuring a communication manager 1420 according to the example described herein, device 1405 can support techniques for maintaining varying degrees of SRS phase coherence in cases where at least a portion of the SRS resources within a bundled SRS resource set has been cancelled or released. By supporting the defined phase coherence configuration, the techniques described herein can improve the phase coherence of the SRS signal in cases where at least a subset of the SRS resources has been cancelled or released, thereby achieving more accurate channel estimation. In this regard, by achieving more accurate channel estimation, the efficiency and reliability of wireless communication within the wireless communication system can be improved, thereby reducing the amount of retransmissions that may be performed, which in turn improves resource utilization at base station 105 and reduces power consumption.

[0305] In some examples, the communication manager 1420 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise cooperating with the transceiver 1415, one or more antennas 1425, or any combination thereof. Although the communication manager 1420 is described as a separate component, in some examples, one or more functions described with reference to the communication manager 1420 may be supported or performed by the processor 1440, memory 1430, code 1435, or any combination thereof. For example, code 1435 may include instructions that can be executed by the processor 1440 to cause the device 1405 to perform various aspects of the techniques for SRS phase coherence as described herein, or the processor 1440 and memory 1430 may be otherwise configured to perform or support such operations.

[0306] Figure 15 A flowchart illustrating a method 1500 for supporting techniques for SRS phase coherence 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 referred to... Figures 1 to 10 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.

[0307] At 1505, the method may include receiving from a base station an indication of a resource set for transmitting a set of multiple phase-coherent SRSs. Operation of 1505 may be performed according to the examples disclosed herein. In some examples, aspects of operation of 1505 may be provided by reference to... Figure 9 The SRS Resource Receiver Manager 925 described herein is used for execution.

[0308] In 1510, the method may include receiving from the base station a control message indicating the cancellation of the allocation of a first portion of the 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 provided by reference to... Figure 9 The described control message receiving manager 930 is used to execute this.

[0309] In 1515, the method may include determining the phase coherence configuration associated with the second portion of the resource set based on receiving the control message indicating the cancellation. The operation of 1515 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1515 may be determined by, as referenced... Figure 9 The phase coherence manager 935 described is used to perform this.

[0310] In 1520, the method may include transmitting one or more SRSs within a second portion of the resource set according to a determined phase coherence configuration. Operation of 1520 may be performed according to the examples disclosed herein. In some examples, aspects of operation of 1520 may be determined by reference to... Figure 9 The SRS transfer manager 940 described is used to execute this.

[0311] Figure 16 A flowchart illustrating a method 1600 for supporting techniques for SRS phase coherence 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 referenced... Figures 1 to 10 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.

[0312] In 1605, the method may include receiving from a base station an indication of a resource set for transmitting a set of multiple phase-coherent SRSs. 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 9 The SRS Resource Receiver Manager 925 described herein is used for execution.

[0313] In 1610, the method may include receiving from the base station a control message indicating the cancellation of the allocation of a first portion of the resource set. Operation of 1610 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1610 may be provided by reference to... Figure 9 The described control message receiving manager 930 is used to execute this.

[0314] In 1615, the method may include determining the phase coherence configuration associated with the second portion of the resource set based on receiving the control message indicating the cancellation. 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 9 The phase coherence manager 935 described is used to perform this.

[0315] At 1620, the method may include transmitting a first phase-coherent SRS set associated with the first phase according to a determined phase coherence configuration. Operation of 1620 may be performed according to the examples disclosed herein. In some examples, aspects of operation of 1620 may be determined by reference to... Figure 9 The SRS transfer manager 940 described is used to execute this.

[0316] In 1625, the method may include transmitting a set of second phase-coherent SRSs associated with a second phase different from the first phase, according to a determined phase coherence configuration. The operation of 1625 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1625 may be determined by reference to... Figure 9 The SRS transfer manager 940 described is used to execute this.

[0317] Figure 17 A flowchart illustrating a method 1700 for supporting techniques for SRS phase coherence 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 referenced... Figures 1 to 10 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.

[0318] In 1705, the method may include receiving from a base station an indication of a resource set for transmitting a set of multiple phase-coherent SRSs. Operation of 1705 may be performed according to the examples disclosed herein. In some examples, aspects of operation of 1705 may be provided by reference to... Figure 9 The SRS Resource Receiver Manager 925 described herein is used for execution.

[0319] In 1710, the method may include receiving from the base station a control message indicating the cancellation of the allocation of a first portion of the 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 provided by reference to... Figure 9 The described control message receiving manager 930 is used to execute this.

[0320] In 1715, the method may include determining the phase coherence configuration associated with the second portion of the resource set based on receiving the control message indicating the cancellation. Operation of 1715 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1715 may be determined by, as referenced... Figure 9 The phase coherence manager 935 described is used to perform this.

[0321] In 1720, the method may include transmitting a first SRS set and a second SRS set different from the first SRS set using shared phase coherence, based on uplink transmissions within a first portion of the schedule associated with the cancellation that identify the absence of the resource set. The 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 9 The SRS transfer manager 940 described is used to execute this.

[0322] Figure 18 A flowchart illustrating a method 1800 for supporting techniques for SRS phase coherence according to various aspects of this disclosure is shown. Operation of method 1800 can be implemented by a UE or its components as described herein. For example, operation of method 1800 can be performed by, as described in reference... Figures 1 to 10 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.

[0323] At 1805, the method may include receiving from a base station an indication of a resource set for transmitting a set of multiple phase-coherent SRSs. Operation of 1805 may be performed according to the examples disclosed herein. In some examples, aspects of operation of 1805 may be provided by reference to... Figure 9 The SRS Resource Receiver Manager 925 described herein is used for execution.

[0324] At 1810, the method may include receiving from the base station a control message indicating cancellation of the allocation of a first portion of the resource set. Operation of 1810 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1810 may be provided by reference to... Figure 9 The described control message receiving manager 930 is used to execute this.

[0325] In 1815, the method may include determining the phase coherence configuration associated with the second portion of the resource set based on receiving the control message indicating the cancellation. The operation of 1815 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1815 may be determined by, as referenced... Figure 9 The phase coherence manager 935 described is used to perform this.

[0326] At 1820, the method may include transmitting a first phase coherent SRS set using a first phase. The operation of 1820 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1820 may be provided by reference to... Figure 9 The SRS transfer manager 940 described is used to execute this.

[0327] In 1825, the method may include transmitting a second-phase coherent SRS set with a second phase different from the first phase, wherein the phase difference between the first phase and the second phase satisfies a phase threshold. The operation of 1825 can be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1825 may be provided as referenced. Figure 9 The SRS transfer manager 940 described is used to execute this.

[0328] Figure 19 A flowchart illustrating a method 1900 for supporting techniques for SRS phase coherence according to various aspects of this disclosure is shown. Operation of method 1900 can be implemented by a base station or its components as described herein. For example, operation of method 1900 can be implemented by, as referred to... Figures 1 to 6 and Figures 11 to 14 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.

[0329] In 1905, the method may include transmitting to the UE an indication of a resource set for transmitting a set of multiple phase-coherent SRSs. Operation of 1905 may be performed according to the examples disclosed herein. In some examples, aspects of operation of 1905 may be provided by reference to... Figure 13 The SRS Resource Transfer Manager 1325 described herein is used for execution.

[0330] In 1910, the method may include transmitting to the UE a control message instructing the cancellation of the allocation of a first portion of the resource set. The operation of 1910 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1910 may be provided by reference to... Figure 13 The control message transmission manager 1330 described is used to execute this.

[0331] In 1915, the method may include determining the phase coherence configuration associated with the second portion of the resource set based on the control message indicating the cancellation. Operation of 1915 may be performed according to the examples disclosed herein. In some examples, aspects of operation of 1915 may be determined by reference to... Figure 13 The phase coherence manager 1335 described is used to perform this.

[0332] In 1920, the method may include receiving one or more SRSs from the UE within a second portion of the resource set, based on a determined phase coherence configuration. Operation of 1920 may be performed according to the examples disclosed herein. In some examples, aspects of operation of 1920 may be determined by reference to... Figure 13 The SRS receiver manager 1340 described herein is used to perform this action.

[0333] The following aspects are given in an illustrative manner and provide an overview of the aspects of this disclosure. Examples of the following aspects may be combined with examples or embodiments shown or discussed with reference to the accompanying drawings or elsewhere herein.

[0334] Aspect 1: A method for wireless communication at a UE, comprising: receiving from a base station an indication of a resource set for transmitting a plurality of phase-coherent SRSs; receiving from the base station a control message indicating cancellation of an allocation of a first portion of the resource set; determining, at least in part, a phase-coherence configuration associated with a second portion of the resource set based on the received control message indicating cancellation; and transmitting one or more SRSs within the second portion of the resource set according to the determined phase-coherence configuration.

[0335] Aspect 2: The method of aspect 1, wherein transmitting the one or more SRSs within the second part of the resource set comprises: transmitting a first set of phase-coherent SRSs; and transmitting a second set of phase-coherent SRSs different from the first set of phase-coherent SRSs.

[0336] Aspect 3: The method of aspect 2 further includes: transmitting a first phase-coherent SRS set in the time domain before the first portion of the resource set associated with the cancellation; and transmitting a second phase-coherent SRS set in the time domain after the first portion of the resource set associated with the cancellation.

[0337] Aspect 4: The method of any one of Aspects 2 to 3 further includes: transmitting a first phase coherent SRS set associated with the first phase; and transmitting a second phase coherent SRS set associated with a second phase different from the first phase.

[0338] Aspect 5: The method of any one of Aspects 1 to 4, wherein transmitting the one or more SRSs within a second portion of the resource set comprises: transmitting a first set of SRSs and a second set of SRSs different from the first set of SRSs using shared phase coherence, at least in part based on the time interval of the first portion of the resource set associated with the cancellation satisfying a time interval threshold.

[0339] Aspect 6: The method of aspect 5, wherein the time interval of the first portion of the resource set associated with the cancellation satisfies the time interval threshold if the time interval is less than the time interval threshold.

[0340] Aspect 7: The method of any one of Aspects 5 and 6 further includes: receiving from the base station a second control message including an indication of a threshold for the time interval, wherein the transmission of the first SRS set and the second SRS set with the shared phase coherence is at least partially based on the reception of the second control message.

[0341] Aspect 8: The method of any one of Aspects 5 to 7 further includes: transmitting a first SRS set and a second SRS set different from the first SRS set using the shared phase coherence, at least in part based on uplink transmissions within a first portion of the schedule associated with the cancellation that identify the absence of the resource set.

[0342] Aspect 9: The method of any one of Aspects 1 to 8, wherein transmitting the one or more SRSs within a second portion of the resource set comprises: transmitting a first SRS set and a second SRS set different from the first SRS set using shared phase coherence, at least in part based on uplink transmissions scheduled within the first portion associated with the cancellation that identify the absence of the resource set.

[0343] Aspect 10: The method of any one of Aspects 1 to 9, wherein the plurality of phase coherent SRSs include: a first set of SRSs associated with a first component carrier and a second set of SRSs associated with a second component carrier, wherein the first set of SRSs and the second set of SRSs are associated with shared phase coherence.

[0344] Aspect 11: The method of aspect 10, wherein a first portion of the resource set associated with the cancellation is located within a second SRS set, wherein transmitting the one or more SRSs comprises: transmitting at least a subset of the first SRS set with a first phase based at least in part on the fact that the first portion of the resource set associated with the cancellation is located within the second SRS set, and transmitting at least a subset of the second SRS set with a second phase different from the first phase.

[0345] Aspect 12: The method of any one of Aspects 10 to 11, wherein the first component carrier and the second component carrier comprise a set of frequency-adjacent component carriers.

[0346] Aspect 13: The method of any one of Aspects 10 to 12, wherein the plurality of phase coherent SRSs further includes a third set of SRSs associated with a third component carrier, the third set of SRSs being associated with the shared phase coherence associated with the first set of SRSs and the second set of SRSs.

[0347] Aspect 14: The method of aspect 13, wherein the second component carrier is located between the first component carrier and the third component carrier in the frequency domain, and wherein transmitting the one or more SRSs comprises: at least partially based on a first portion of the resource set associated with the cancellation being located within the second SRS set, transmitting at least a subset of the first SRS set with a first phase, and transmitting at least a subset of the third SRS set with a second phase different from the first phase.

[0348] Aspect 15: The method of any one of Aspects 1 to 14, wherein transmitting the one or more SRSs within the second portion of the resource set comprises: transmitting a first phase coherent SRS set with a first phase; and transmitting a second phase coherent SRS set with a second phase different from the first phase, wherein the phase difference between the first phase and the second phase satisfies a phase threshold.

[0349] Aspect 16: The method of aspect 15, wherein the phase difference between the first phase and the second phase satisfies the phase threshold when the phase difference is less than the phase threshold.

[0350] Aspect 17: The method of any one of Aspects 15 to 16 further includes: transmitting to the base station a UE capability report including an indication of the phase threshold, wherein transmitting the first phase coherent SRS set and the second phase coherent SRS set is at least partially based on transmitting the UE capability report.

[0351] Aspect 18: The method of any one of Aspects 1 to 17 further includes: transmitting a UE capability report to the base station, the UE capability report including an indication of one or more phase coherence configurations supported by the UE, wherein the transmission of the one or more SRSs is at least in part based on the transmission of the UE capability report.

[0352] Aspect 19: The method of any one of Aspects 1 to 18, wherein the control message includes a ULCI message.

[0353] Aspect 20: The method of any one of Aspects 1 to 19, wherein a first portion of the resource set associated with the cancellation is associated with TD-OCC, wherein transmitting the one or more SRS comprises: transmitting the one or more SRS at least in part based on the fact that the one or more SRS is not associated with TD-OCC.

[0354] Aspect 21: The method of aspect 20, further comprising: suppressing the transmission of one or more additional SRS associated with TD-OCC at least in part based on one or more additional SRS associated with the second portion of the resource set.

[0355] Aspect 22: The method of any one of Aspects 1 to 21, wherein the plurality of phase coherent SRSs include periodic SRS, semi-periodic SRS, aperiodic SRS or any combination thereof.

[0356] Aspect 23: The method of any one of Aspects 1 to 22 further includes: receiving from the base station a unicast DCI message, a group shared DCI message, or both, wherein an indication of the resource set for transmitting the plurality of phase coherent SRSs is received via the unicast DCI message, the group shared DCI message, or both.

[0357] Aspect 24: A method for wireless communication at a base station, comprising: transmitting to a UE an indication of a resource set for transmitting a plurality of phase-coherent SRSs; transmitting to the UE a control message indicating cancellation of the allocation of a first portion of the resource set; determining, at least in part, a phase-coherence configuration associated with a second portion of the resource set based on the transmission of the control message indicating the cancellation; and receiving one or more SRSs from the UE within the second portion of the resource set according to the determined phase-coherence configuration.

[0358] Aspect 25: The method of aspect 24, wherein receiving the one or more SRSs within a second portion of the resource set comprises: receiving a first set of phase-coherent SRSs; and receiving a second set of phase-coherent SRSs different from the first set of phase-coherent SRSs.

[0359] Aspect 26: The method of aspect 25 further includes: receiving a first phase-coherent SRS set in the time domain before the first portion of the resource set associated with the cancellation; and receiving a second phase-coherent SRS set in the time domain after the first portion of the resource set associated with the cancellation.

[0360] Aspect 27: The method of any one of Aspects 25 to 26 further includes: receiving a first phase coherent SRS set associated with a first phase; and receiving a second phase coherent SRS set associated with a second phase different from the first phase.

[0361] Aspect 28: The method of any one of Aspects 24 to 27, wherein receiving the one or more SRSs within a second portion of the resource set comprises: receiving a first set of SRSs and a second set of SRSs different from the first set of SRSs with shared phase coherence, at least in part based on the time interval of the first portion of the resource set associated with the cancellation satisfying a time interval threshold.

[0362] Aspect 29: The method of aspect 28, wherein the time interval of the first portion of the resource set associated with the cancellation satisfies the time interval threshold if the time interval is less than the time interval threshold.

[0363] Aspect 30: The method of any one of Aspects 28 to 29 further includes: transmitting to the UE a second control message including an indication of a threshold for the time interval, wherein receiving the first SRS set and the second SRS set with the shared phase coherence is at least partially based on transmitting the second control message.

[0364] Aspect 31: The method of any one of Aspects 28 to 30 further includes: receiving, at least in part, a first SRS set and a second SRS set different from the first SRS set using the shared phase coherence based on uplink transmissions within a first portion of the schedule associated with the cancellation that identify the absence of the resource set.

[0365] Aspect 32: The method of any one of Aspects 24 to 31, wherein receiving the one or more SRSs within a second portion of the resource set comprises: receiving a first set of SRSs and a second set of SRSs different from the first set of SRSs with shared phase coherence, at least in part based on uplink transmissions scheduled within the first portion associated with the cancellation that identify the absence of the resource set.

[0366] Aspect 33: The method of any one of Aspects 24 to 32, wherein the plurality of phase coherent SRSs includes: a first set of SRSs associated with a first component carrier and a second set of SRSs associated with a second component carrier, wherein the first set of SRSs and the second set of SRSs are associated with shared phase coherence.

[0367] Aspect 34: The method of aspect 33, wherein a first portion of the resource set associated with the cancellation is located within a second SRS set, wherein receiving the one or more SRSs comprises: receiving at least a subset of the first SRS set with a first phase based at least in part on the fact that the first portion of the resource set associated with the cancellation is located within the second SRS set, and receiving at least a subset of the second SRS set with a second phase different from the first phase.

[0368] Aspect 35: The method of any one of Aspects 33 to 34, wherein the first component carrier and the second component carrier comprise a set of frequency-adjacent component carriers.

[0369] Aspect 36: The method of any one of Aspects 33 to 35, wherein the plurality of phase coherent SRSs further includes a third set of SRSs associated with a third component carrier, the third set of SRSs being associated with the shared phase coherence associated with the first set of SRSs and the second set of SRSs.

[0370] Aspect 37: The method of aspect 36, wherein the second component carrier is located between the first component carrier and the third component carrier in the frequency domain, and wherein receiving the one or more SRSs comprises: at least partially based on a first portion of the resource set associated with the cancellation being located within the second SRS set, receiving at least a subset of the first SRS set with a first phase, and receiving at least a subset of the third SRS set with a second phase different from the first phase.

[0371] Aspect 38: The method of any one of Aspects 24 to 37, wherein receiving the one or more SRSs in the second part of the resource set comprises: receiving a first phase coherent SRS set with a first phase; and receiving a second phase coherent SRS set with a second phase different from the first phase, wherein the phase difference between the first phase and the second phase satisfies a phase threshold.

[0372] Aspect 39: The method of aspect 38, wherein the phase difference between the first phase and the second phase satisfies the phase threshold when the phase difference is less than the phase threshold.

[0373] Aspect 40: The method of any one of Aspects 38 to 39 further includes: receiving from the UE a UE capability report including an indication of the phase threshold, wherein receiving the first phase coherent SRS set and the second phase coherent SRS set is at least partially based on receiving the UE capability report.

[0374] Aspect 41: The method of any one of Aspects 24 to 40 further includes: receiving a UE capability report from the UE, the UE capability report including an indication of one or more phase coherence configurations supported by the UE, wherein receiving the one or more SRSs is at least in part based on receiving the UE capability report.

[0375] Aspect 42: The method of any one of Aspects 24 to 41, wherein the control message includes a ULCI message.

[0376] Aspect 43: The method of any one of Aspects 24 to 42, wherein a first portion of the resource set associated with the cancellation is associated with TD-OCC, wherein receiving the one or more SRS comprises: receiving the one or more SRS at least in part based on the fact that the one or more SRS is not associated with TD-OCC.

[0377] Aspect 44: The method of aspect 43, further comprising: suppressing the reception of one or more additional SRSs associated with TD-OCC at least in part based on one or more additional SRSs associated with the second portion of the resource set.

[0378] Aspect 45: The method of any one of Aspects 24 to 44, wherein the plurality of phase coherent SRSs include periodic SRS, semi-periodic SRS, aperiodic SRS or any combination thereof.

[0379] Aspect 46: The method of any one of Aspects 24 to 45 further includes: transmitting to the UE a unicast DCI message, a group shared DCI message, or both, wherein an indication of the resource set for transmitting the plurality of phase coherent SRSs is transmitted via the unicast DCI message, the group shared DCI message, or both.

[0380] Aspect 47: The method of any one of Aspects 24 to 46 further includes: determining a channel estimate associated with the channel between the UE and the base station based at least in part on the received one or more SRS.

[0381] Aspect 48: The method of aspect 47, wherein receiving the one or more SRSs within a second portion of the resource set comprises: receiving a first set of phase-coherent SRSs; and receiving a second set of phase-coherent SRSs different from the first set of phase-coherent SRSs, wherein the channel estimate is determined at least in part based on the first set of phase-coherent SRSs, the second set of phase-coherent SRSs, or both.

[0382] Aspect 49: The method of any one of Aspects 47 to 48 further includes: receiving uplink transmissions from the UE; and demodulating the uplink transmissions at least in part based on the determined channel estimate.

[0383] Aspect 50: The method of any one of Aspects 47 to 49 further includes: determining a precoder associated with the downlink transmission based at least in part on the determined channel estimate; and transmitting the downlink transmission to the UE based at least in part on the determined precoder.

[0384] Aspect 51: An apparatus for wireless communication at a UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory, which can be executed by the processor to cause the apparatus to perform a method as described in any one of Aspects 1 to 23.

[0385] Aspect 52: An apparatus for wireless communication at a UE, comprising at least one means for performing a method as described in any one of aspects 1 to 23.

[0386] Aspect 53: 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 23.

[0387] Aspect 54: 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 method of any one of aspects 24 to 50.

[0388] Aspect 55: An apparatus for wireless communication at a base station, comprising at least one means for performing the method of any one of aspects 24 to 50.

[0389] Aspect 56: 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 24 to 50.

[0390] 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.

[0391] 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.

[0392] 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.

[0393] 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).

[0394] 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.

[0395] 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.

[0396] As used herein (including in the claims), the word "or" in an enumeration of items (e.g., an enumeration of items accompanied by phrases such as "at least one of" or "one or more of") indicates an inclusive enumeration, such that an enumeration of at least one of, for example, 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). Similarly, as used herein, the phrase "based on" should not be interpreted as referring to a closed set of conditions. For example, an example step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "at least partially based on".

[0397] 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.

[0398] The descriptions herein, illustrated with reference to the accompanying drawings, depict exemplary configurations and are not representative of all examples that may 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 in block diagram form to avoid obscuring the concepts of the described examples.

[0399] 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 performing wireless communication at a user equipment (UE), comprising: Receive from the base station an indication of a resource set for transmitting multiple phase-coherent probe reference signals; Receive from the base station a control message indicating cancellation of the allocation of the first part of the resource set; The phase coherence configuration associated with the second portion of the resource set is determined at least in part based on the received control message indicating the cancellation; as well as Based on the determined phase coherence configuration, one or more probe reference signals are transmitted within the second portion of the resource set.

2. The method of claim 1, wherein transmitting the one or more probe reference signals within the second portion of the resource set comprises: Transmit the first phase coherent probe reference signal set; as well as Transmit a second set of phase coherent probe reference signals that is different from the first set of phase coherent probe reference signals.

3. The method of claim 2, further comprising: The first set of phase-coherent probe reference signals is transmitted in the time domain before the first portion of the resource set associated with the cancellation; as well as In the time domain, the second phase coherent probe reference signal set is transmitted after the first portion of the resource set associated with the cancellation.

4. The method of claim 2, further comprising: Transmit the first phase coherent probe reference signal set associated with the first phase; as well as Transmit a set of second-phase coherent probe reference signals associated with a second phase different from the first phase.

5. The method of claim 1, wherein transmitting the one or more probe reference signals within the second portion of the resource set comprises: At least in part, based on the fact that the time interval of the first portion of the resource set associated with the cancellation is less than a time interval threshold, a first set of probe reference signals and a second set of probe reference signals different from the first set of probe reference signals are transmitted using shared phase coherence.

6. The method of claim 5, further comprising: The base station receives a second control message including an indication of a time interval threshold, wherein the transmission of the first and second breakthrough reference signal sets using the shared phase coherence is at least in part based on the receipt of the second control message.

7. The method of claim 1, wherein transmitting the one or more probe reference signals within the second portion of the resource set comprises: At least in part, based on the uplink transmissions within the first portion of the schedule associated with the cancellation that identify the absence of the resource set, a first set of probe reference signals and a second set of probe reference signals different from the first set of probe reference signals are transmitted using shared phase coherence.

8. The method of claim 1, wherein the plurality of phase-coherent probe reference signals comprises: A first set of probe reference signals associated with a first component carrier and a second set of probe reference signals associated with a second component carrier, wherein the first set of probe reference signals and the second set of probe reference signals are associated with common phase coherence, and wherein the first component carrier and the second component carrier include a set of frequency-adjacent component carriers.

9. The method of claim 8, wherein the first portion of the resource set associated with the cancellation is located within the second set of breakthrough reference signals, wherein transmitting the one or more breakthrough reference signals comprises: Based at least in part on the fact that the first portion of the resource set associated with the cancellation is located within the second breakthrough reference signal set, at least a subset of the first breakthrough reference signal set is transmitted with a first phase, and at least a subset of the second breakthrough reference signal set is transmitted with a second phase different from the first phase.

10. The method of claim 8, wherein the plurality of phase-coherent probe reference signals further includes a third probe reference signal set associated with a third component carrier, and wherein the third probe reference signal set is associated with the shared phase coherence associated with the first probe reference signal set and the second probe reference signal set.

11. The method of claim 10, wherein the second component carrier is located in the frequency domain between the first component carrier and the third component carrier, and wherein transmitting the one or more probe reference signals comprises: Based at least in part on the fact that the first portion of the resource set associated with the cancellation is located within the second breakthrough reference signal set, at least a subset of the first breakthrough reference signal set is transmitted with a first phase, and at least a subset of the third breakthrough reference signal set is transmitted with a second phase different from the first phase.

12. The method of claim 1, wherein transmitting the one or more probe reference signals within the second portion of the resource set comprises: The first phase is used to transmit the first phase coherent probe reference signal set; as well as A second phase coherent probe reference signal set is transmitted using a second phase different from the first phase, wherein the phase difference between the first phase and the second phase is less than a phase threshold.

13. The method of claim 12, further comprising: The base station transmits a UE capability report including an indication of the phase threshold, wherein the transmission of the first phase coherent probe reference signal set and the second phase coherent probe reference signal set is at least partially based on the transmission of the UE capability report.

14. The method of claim 1, further comprising: A UE capability report is transmitted to the base station, the UE capability report including indications of one or more phase coherence configurations supported by the UE, wherein the transmission of the one or more probe reference signals is at least in part based on the transmission of the UE capability report.

15. The method of claim 1, wherein the first portion of the resource set associated with the cancellation is associated with a time-division orthogonal overlay code, wherein transmitting the one or more probe reference signals comprises: The one or more breakthrough reference signals are transmitted at least in part based on the fact that they are not associated with the time-division orthogonal coverage code; as well as The transmission of the one or more additional probe reference signals is suppressed at least in part based on the association of one or more additional probe reference signals associated with the second portion of the resource set with the time-division orthogonal overlay code.

16. The method of claim 1, wherein the resource set includes a symbol period set.

17. A method for conducting wireless communication at a base station, comprising: Transmit to the user equipment (UE) an indication of a resource set for transmitting multiple phase-coherent probe reference signals; A control message instructing the UE to cancel the allocation of the first part of the resource set is transmitted; The phase coherence configuration associated with the second portion of the resource set is determined at least in part based on the control message indicating the cancellation. as well as Based on the determined phase coherence configuration, one or more probe reference signals are received from the UE within the second part of the resource set.

18. The method of claim 17, wherein receiving the one or more probe reference signals within the second portion of the resource set comprises: A first phase coherent probe reference signal set is received in the time domain before the first portion of the resource set associated with the cancellation, wherein the first phase coherent probe reference signal set is associated with a first phase; as well as In the time domain, after the first portion of the resource set associated with the cancellation, a second phase coherent probe reference signal set, different from the first phase coherent probe reference signal set, is received, wherein the second phase coherent probe reference signal set is associated with a second phase different from the first phase.

19. The method of claim 17, wherein receiving the one or more probe reference signals within the second portion of the resource set comprises: The first set of probe reference signals and a second set of probe reference signals, different from the first set of probe reference signals, are received using shared phase coherence, based at least in part on the fact that the time interval of the first portion of the resource set associated with the cancellation is less than a time interval threshold.

20. An apparatus for performing 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 from the base station an indication of a resource set for transmitting multiple phase-coherent probe reference signals; Receive from the base station a control message indicating cancellation of the allocation of the first part of the resource set; The phase coherence configuration associated with the second portion of the resource set is determined at least in part based on the received control message indicating the cancellation; as well as Based on the determined phase coherence configuration, one or more probe reference signals are transmitted within the second portion of the resource set.

21. The apparatus of claim 20, wherein instructions executable by the processor to cause the apparatus to transmit the one or more probe reference signals within the second portion of the resource set include instructions executable by the processor to cause the apparatus to perform the following operations: Transmit the first phase coherent probe reference signal set; and Transmit a second set of phase coherent probe reference signals that is different from the first set of phase coherent probe reference signals.

22. The apparatus of claim 21, wherein instructions executable by the processor further cause the apparatus to: Transmit the first set of phase-coherent probe reference signals in the time domain before the first portion of the resource set associated with the cancellation; and In the time domain, the second phase coherent probe reference signal set is transmitted after the first portion of the resource set associated with the cancellation.

23. The apparatus of claim 21, wherein instructions executable by the processor further cause the apparatus to: Transmit the set of first-phase coherent probe reference signals associated with the first phase; and Transmit a set of second-phase coherent probe reference signals associated with a second phase different from the first phase.

24. The apparatus of claim 20, wherein instructions executable by the processor to cause the apparatus to transmit the one or more probe reference signals within the second portion of the resource set include instructions executable by the processor to cause the apparatus to perform the following operations: At least in part, based on the fact that the time interval of the first portion of the resource set associated with the cancellation is less than a time interval threshold, a first set of probe reference signals and a second set of probe reference signals different from the first set of probe reference signals are transmitted using shared phase coherence.

25. The apparatus of claim 24, wherein instructions executable by the processor further cause the apparatus to: The base station receives a second control message including an indication of a time interval threshold, wherein the transmission of the first and second breakthrough reference signal sets using the shared phase coherence is at least in part based on the receipt of the second control message.

26. The apparatus of claim 20, wherein instructions executable by the processor to cause the apparatus to transmit the one or more probe reference signals within the second portion of the resource set include instructions executable by the processor to cause the apparatus to perform the following operations: At least in part, based on the uplink transmissions within the first portion of the schedule associated with the cancellation that identify the absence of the resource set, a first set of probe reference signals and a second set of probe reference signals different from the first set of probe reference signals are transmitted using shared phase coherence.

27. The apparatus of claim 20, wherein the plurality of phase-coherent probe reference signals comprise: A first set of probe reference signals associated with a first component carrier and a second set of probe reference signals associated with a second component carrier, wherein the first set of probe reference signals and the second set of probe reference signals are associated with common phase coherence, and wherein the first component carrier and the second component carrier include a set of frequency-adjacent component carriers.

28. The apparatus of claim 27, wherein the first portion of the resource set associated with the cancellation is located within the second set of probe reference signals, wherein transmitting the one or more probe reference signals comprises: Based at least in part on the fact that the first portion of the resource set associated with the cancellation is located within the second breakthrough reference signal set, at least a subset of the first breakthrough reference signal set is transmitted with a first phase, and at least a subset of the second breakthrough reference signal set is transmitted with a second phase different from the first phase.

29. The apparatus of claim 27, wherein the plurality of phase-coherent probe reference signals further includes a third probe reference signal set associated with a third component carrier, and wherein the third probe reference signal set is associated with the shared phase coherence associated with the first probe reference signal set and the second probe reference signal set.

30. The apparatus of claim 29, wherein the second component carrier is located in the frequency domain between the first component carrier and the third component carrier, and wherein transmitting the one or more probe reference signals comprises: Based at least in part on the fact that the first portion of the resource set associated with the cancellation is located within the second breakthrough reference signal set, at least a subset of the first breakthrough reference signal set is transmitted with a first phase, and at least a subset of the third breakthrough reference signal set is transmitted with a second phase different from the first phase.

31. The apparatus of claim 20, wherein instructions executable by the processor to cause the apparatus to transmit the one or more probe reference signals within the second portion of the resource set include instructions executable by the processor to cause the apparatus to perform the following operations: The first phase is used to transmit the first phase coherent probe reference signal set; and A second phase coherent probe reference signal set is transmitted using a second phase different from the first phase, wherein the phase difference between the first phase and the second phase is less than a phase threshold.

32. The apparatus of claim 31, wherein instructions executable by the processor further cause the apparatus to: The base station transmits a UE capability report including an indication of the phase threshold, wherein the transmission of the first phase coherent probe reference signal set and the second phase coherent probe reference signal set is at least partially based on the transmission of the UE capability report.

33. The apparatus of claim 20, wherein instructions executable by the processor further cause the apparatus to: A UE capability report is transmitted to the base station, the UE capability report including indications of one or more phase coherence configurations supported by the UE, wherein the transmission of the one or more probe reference signals is at least in part based on the transmission of the UE capability report.

34. The apparatus of claim 20, wherein the first portion of the resource set associated with the cancellation is associated with a time-division orthogonal overlay code, wherein transmitting the one or more probe reference signals comprises: The one or more breakthrough reference signals are transmitted at least in part based on the fact that they are not associated with the time-division orthogonal coverage code; as well as The transmission of the one or more additional probe reference signals is suppressed at least in part based on the association of one or more additional probe reference signals associated with the second portion of the resource set with the time-division orthogonal overlay code.

35. The apparatus of claim 20, wherein the resource set comprises a symbol period set.

36. An apparatus for conducting wireless communication at a base station, 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: Transmit to the user equipment (UE) an indication of a resource set for transmitting multiple phase-coherent probe reference signals; A control message instructing the UE to cancel the allocation of the first part of the resource set is transmitted; The phase coherence configuration associated with the second portion of the resource set is determined at least in part based on the control message indicating the cancellation. as well as Based on the determined phase coherence configuration, one or more probe reference signals are received from the UE within the second part of the resource set.

37. The apparatus of claim 36, wherein instructions executable by the processor to cause the apparatus to receive the one or more probe reference signals within the second portion of the resource set include instructions executable by the processor to cause the apparatus to perform the following operations: In the time domain, a first phase coherent probe reference signal set is received prior to the first portion of the resource set associated with the cancellation, wherein the first phase coherent probe reference signal set is associated with a first phase; and In the time domain, after the first portion of the resource set associated with the cancellation, a second phase coherent probe reference signal set, different from the first phase coherent probe reference signal set, is received, wherein the second phase coherent probe reference signal set is associated with a second phase different from the first phase.

38. The apparatus of claim 36, wherein instructions executable by the processor to cause the apparatus to receive the one or more probe reference signals within the second portion of the resource set include instructions executable by the processor to cause the apparatus to perform the following operations: The first set of probe reference signals and a second set of probe reference signals, different from the first set of probe reference signals, are received using shared phase coherence, based at least in part on the fact that the time interval of the first portion of the resource set associated with the cancellation is less than a time interval threshold.

Images