Prioritization rules for physical random access channel (PRACH) transmissions for physical downlink control channel (PDCCH) commands in low layer mobility

Abstract

A method, an apparatus, and a computer program product are provided for prioritizing uplink transmissions to a current serving network node or a non-serving target candidate network node. In the context of a method, the method comprises: obtaining first uplink transmission data indicating a first uplink transmission for transmission to a non-serving candidate target network node via a user equipment, and obtaining second uplink transmission data indicating a second uplink transmission for transmission via the user equipment to the current serving network node. The method further includes determining a transmission conflict between the first uplink transmission and the second uplink transmission based at least in part on the first uplink transmission data and the second uplink transmission data. The method also includes performing a response action corresponding to the first uplink transmission and the second uplink transmission based at least in part on the transmission conflict.

Description

TECHNICAL FIELD

[0001] Example embodiments generally relate to transmission prioritization techniques for use in cases of full or partial transmission overlap between uplink transmissions to a non-serving candidate target network node and uplink transmissions to a current serving network node. BACKGROUND

[0002] In conventional communication systems, user equipment (UE) mobility handover is managed at the network layer (Layer 3 (L3)), which can result in undesirable handover interruption due to the richness of cell handover procedures (e.g., uplink synchronization procedures at L3). Recent telecommunication approaches can shift mobility handover functionality to lower layers, such as the physical layer (Layer 1 (LI)) and the data link layer (Layer 2 (L2)). Such techniques can allow uplink synchronization with a candidate target cell (e.g., a non-serving cell) before a cell handover (e.g., UE mobility handover) occurs. While such approaches can reduce handover interruption, cases of uplink (UL) transmission overlap between UL transmissions to a non-serving candidate target cell and UL transmissions to a current serving cell can arise, and past and current solutions can not accommodate these transmission conflicts. For example, such approaches can be limited to transmission and dropping rules configured for uplink transmissions to a current serving cell. SUMMARY

[0003] A method, apparatus, and computer program product are provided in accordance with example embodiments to determine cases of uplink transmission conflict at a user equipment and to prioritize transmissions of uplink transmissions to a current serving network node or a non-serving candidate target network node. In various embodiments, the method, apparatus, and computer program product provide improved solutions for (de) prioritizing transmissions to a non-serving candidate target network node in cases of transmission conflict between uplink transmissions for a current serving network node and uplink transmissions for a non-serving candidate target network node.

[0004] In some embodiments, to perform a random access channel (RACH)-free handover for a user equipment, a physical downlink control channel (PDCCH) order RACH is supported to perform an early timing advance acquisition (e.g., acquire a timing advance of a candidate target network node before a node handover and while a connection with a current serving (source) network node exists). In some embodiments, for a PDCCH order RACH-based solution, a user equipment sends a physical random access channel (PRACH) to a non-serving candidate target network node (e.g., such as a non-serving Layer 1, Layer 2 triggered mobility (LTM) candidate cell) (e.g., according to a configuration given in the PDCCH order).

[0005] In some embodiments, since early TA acquisition procedures are potentially associated with upcoming node switch commands (e.g., a user equipment changes a serving network node and moves to a candidate network node where a PDCCH order RACH is triggered), such uplink transmissions can need to be considered with certain priority. For example, low latency and short interruption time for uplink transmissions and related procedures can be key performance indicators for mobility switching. However, previous approaches can not account for such prioritization needs. For example, previous approaches can not provide prioritization rules for PRACH transmissions to network nodes (e.g., cells) that are not a current serving network node. In the same example, previous approaches can not provide prioritization rules for PDCCH order PRACH transmissions for early TA acquisition for non-serving LTM candidate target network nodes (e.g., which can include candidates for a new primary cell (Pcell)). In various embodiments, the present disclosure provides technical solutions to overcome these challenges, including improved methods for prioritizing PDCCH order PRACH transmissions for early TA acquisition for non-serving LTM candidate network nodes when the PDCCH order PRACH transmissions overlap (e.g., fully or partially overlap in time, and / or overlap by a threshold number of symbols) with one or more uplink (UL) transmissions to a current serving network node (e.g., in cases where a user equipment can only perform one transmission at any time).

[0006] In some embodiments, in the LTM, a timing advance acquisition of a non-serving candidate target network node (e.g., or its cell) is performed prior to performing a node or cell handover. In one or more embodiments, the timing advance of the candidate node (or cell(s)) supports PDCCH ordered RACH (e.g., where the PDCCH order is triggered by the current serving network node). In at least one embodiment, the PDCCH order from the current serving network node contains an indication of the non-serving candidate target network node (e.g., reserved bit(s) in the downlink control information (DCI) are used to indicate the node or cell identity). In various embodiments, for the PDCCH ordered RACH for the non-serving target candidate network node (or cell), a random access response (RAR) reception can be configured / indicated. In some embodiments, if the RAR reception is not configured / indicated (no RAR), the timing advance value of the non-serving candidate target network node is indicated in the cell handover command. In at least one embodiment, if the RAR reception is configured / indicated, the RAR contains at least the timing advance of the non-serving target candidate network node (e.g., or its candidate cell). In some embodiments, the maximum number of timing advance values stored by the user equipment is a user equipment capability. In one or more embodiments, for the PDCCH ordered RACH, if the RAR reception is not configured, user equipment autonomous retransmission of PRACH is not allowed (e.g., regardless of the configuration of PreambleTransMax which indicates the maximum number of random access (RA) preamble transmissions performed before declaring a failure). In various embodiments, when the RAR reception is configured, the RAR is supported to be received from the current serving network node (e.g., at least in case of a distributed unit). In at least one embodiment, when the RAR reception is configured, the RAR is supported to be received from the current serving network node in case of inter-distributed unit. In some embodiments, for the PDCCH ordered RACH, if the RAR reception is not configured, a determination of whether a power ramping is performed is generated based on the PDCCH order. In one or more embodiments, if the power ramping is performed, the PDCCH order explicitly indicates whether the PRACH is an initial transmission or a retransmission. In various embodiments, the power is determined by open loop power control.

[0007] In some embodiments, PDCCH order based PRACH, on a candidate target network node that is not a current serving network node (e.g., using PUCCH / PUSCH), is prioritized if the PRACH overlaps in time with any uplink transmissions on the current serving cell that would be interrupted. In some embodiments, any uplink transmissions on the serving cell are dropped at least during the switching time required before and after the PRACH transmission. In some embodiments, uplink synchronization for a non-serving candidate target network node is triggered by a PDCCH order when the transmission quality of the current serving network node is below a threshold (e.g., PRACH transmissions to the candidate target network node can have higher priority). In some embodiments, if the user equipment cannot make multiple transmissions (e.g., including any interruption due to radio frequency retuning time) when a PRACH to a candidate target network node is sent, the associated UE temporarily suspends uplink transmissions on the current serving network node(s). As described herein, improved uplink prioritization techniques can be used to configure prioritization (e.g., sending or dropping) of PDCCH order based PRACH transmissions for non-serving candidate target network nodes under various scenarios and conditions.

[0008] In at least one embodiment, a method is provided that includes: (i) obtaining first uplink transmission data indicative of a first uplink transmission for transmission via a user equipment to a non-serving candidate target network node, (ii) obtaining second uplink transmission data indicative of a second uplink transmission for transmission via the user equipment to a current serving network node, (iii) determining, based at least in part on the first uplink transmission data and the second uplink transmission data, a transmission conflict between the first uplink transmission and the second uplink transmission, and (iv) performing, based at least in part on the transmission conflict, a responsive action corresponding to the first uplink transmission and the second uplink transmission. In some embodiments, determining the transmission conflict between the first uplink transmission and the second uplink transmission includes at least one of: (i) identifying, based at least in part on the first uplink transmission data and the second uplink transmission data, a threshold number of symbol overlaps between the first uplink transmission and the second uplink transmission, or (ii) identifying, based at least in part on the first uplink transmission data and the second uplink transmission data, a threshold time gap between the first uplink transmission and the second uplink transmission. In various embodiments, the first uplink transmission for transmission to the non-serving candidate target network node includes a PRACH transmission or a sounding reference signal (SRS) transmission. In one or more embodiments, the non-serving candidate target network node is a non-serving candidate target cell and the current serving network node is a current serving cell.

[0009] In some embodiments, the second uplink transmission comprises at least one of: (i) a physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH) transmission carrying a hybrid automatic repeat request acknowledgement (HARQ-ACK), (ii) a PUSCH or PUCCH transmission carrying a positive scheduling request (SR), a positive rank indicator (RI), a positive channel state information reference signal (CSI-RS) resource indicator (CRI), or a positive synchronization signal block rank indicator (SSBRI), or (iii) a physical random access channel (PRACH) transmission, and the responsive action comprises discarding (e.g., not transmitting) the first uplink transmission to the non-serving candidate target network node and providing (e.g., transmitting) the second uplink transmission to the current serving network node. In some embodiments, the second uplink transmission comprises at least one of: (i) a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI, or (ii) a PRACH transmission, and the responsive action comprises discarding the second uplink transmission to the current serving network node and providing the first uplink transmission to the non-serving candidate target network node. In some embodiments, the second uplink transmission comprises at least one of: (i) a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI, or (ii) a PUSCH or PUCCH transmission carrying a HARQ-ACK, and the responsive action comprises discarding the second uplink transmission to the current serving network node and providing the first uplink transmission to the non-serving candidate target network node. In some embodiments, the second uplink transmission comprises a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI, and the responsive action comprises discarding the second uplink transmission to the current serving network node and providing the first uplink transmission to the non-serving candidate target network node.

[0010] In some embodiments, the second uplink transmission comprises at least one of: (i) a PUSCH transmission carrying aperiodic CSI, (ii) a PUCCH or PUSCH transmission carrying at least one of periodic channel state information (CSI) or semi-CSI, wherein the at least one of periodic CSI or semi-persistent CSI comprises at least one of: a channel quality indicator (CQI), a precoding matrix indicator (PMI), a layer 1 reference signal received power (L1-RSRP), or a layer 1 signal to interference plus noise ratio (L1-SINR), or (iii) a sounding reference signal (SRS) transmission, and the responsive action comprises: dropping the second uplink transmission to the current serving network node, and providing the first uplink transmission to the non-serving candidate target network node. In some embodiments, the second uplink transmission comprises a PUSCH transmission carrying aperiodic CSI, and the responsive action comprises: dropping the first uplink transmission to the non-serving candidate target network node, and providing the second uplink transmission to the current serving network node. In some embodiments, the second uplink transmission comprises at least one of a PUCCH transmission or a PUSCH transmission. In some embodiments, the method further comprises determining at least one of: (i) a priority index of the second uplink transmission exceeds a priority index of the first uplink transmission, or (ii) a priority index of the second uplink transmission exceeds a predetermined threshold, wherein the responsive action comprises: in response to the determination: dropping the first uplink transmission to the non-serving candidate target network node, and providing the second uplink transmission to the current serving network node.

[0011] In some embodiments, the method further comprises determining that the user equipment is provided with an active or indicated transmission configuration indicator (TCI) state for the non-serving candidate target network node, wherein the responsive action comprises: in response to the determination: dropping the second uplink transmission to the current serving network node, and providing the first uplink transmission to the non-serving candidate target network node. In some embodiments, the method further comprises determining a presence of downlink timing synchronization between the non-serving candidate target network node and the user equipment, wherein the responsive action comprises: in response to the determination: dropping the second uplink transmission to the current serving network node, and providing the first uplink transmission to the non-serving candidate target network node.

[0012] In some embodiments, the first uplink transmission comprises a PRACH transmission triggered by a physical downlink control channel (PDCCH) order. In some embodiments, the method further comprises determining that the PDCCH order indicates at least one of: a retransmission, an initial transmission, or a new transmission, wherein the responsive action comprises: responsive to the determination: dropping the second uplink transmission to the current serving network node, and providing the first uplink transmission to the non-serving candidate target network node. In some embodiments, the first uplink transmission comprises a first physical random access channel (PRACH) transmission or an SRS transmission, and the second uplink transmission comprises a second PRACH transmission to a primary cell of the current serving network node, the method further comprising: dropping the first uplink transmission to the non-serving candidate target network node, and providing the second uplink transmission to the current serving network node. In some embodiments, the first uplink transmission comprises a first physical random access channel (PRACH) transmission or an SRS transmission, and the second uplink transmission comprises a second PRACH transmission, and the method further comprises determining that at least one primary cell of the current serving network node is experiencing beam failure recovery (e.g., since beam failure recovery can be prioritized to ensure that the connection between the user equipment and the current serving network node is timely recovered). In some embodiments, responsive to determining that at least one primary cell of the current serving network node is experiencing beam failure recovery (e.g., and in the performance of the responsive action), the method further comprises: dropping the first uplink transmission to the non-serving candidate target network node, and providing the second uplink transmission to the current serving network node. In some embodiments, the first uplink transmission comprises a first physical random access channel (PRACH) transmission or an SRS transmission, and the second uplink transmission comprises a second PRACH transmission to a secondary cell of the current serving network node, the method further comprising: dropping the second uplink transmission to the current serving candidate target network node, and providing the first uplink transmission to the non-serving network node. In some embodiments, the method further comprises determining (i) that at least one secondary cell of the current serving network node is experiencing beam failure recovery, and (ii) that a primary cell of the current serving network node is not experiencing beam failure recovery. In some embodiments, responsive to determining that at least one secondary cell of the current serving network node is experiencing beam failure recovery, and that a primary cell of the current serving network node is not experiencing beam failure recovery, the method further comprises (e.g., in the performance of the responsive action): dropping the second uplink transmission to the current serving network node, and providing the first uplink transmission to the non-serving candidate target network node.In some embodiments, the method further includes determining that the user equipment has triggered a maximum permissible exposure (MPE) report, wherein in response to the determination and in performance of the responsive action, the method further includes dropping the first uplink transmission to the non-serving candidate target network node and providing a second uplink transmission to the currently serving network node.

[0013] In some embodiments, wherein the first uplink transmission comprises a first PRACH transmission or an SRS transmission and the second uplink transmission comprises a second PRACH transmission, the method further includes determining that the second PRACA transmission comprises a beam failure recovery based on contention based random access (CBRA) or a contention free random access (CFRA) transmission. In some embodiments, in response to determining that the second PRACH transmission comprises a beam failure recovery based on contention based random access (CBRA) or a contention free random access (CFRA) transmission (e.g., and in performance of the responsive action), the method further includes dropping the first uplink transmission to the non-serving candidate target network node and providing a second uplink transmission to the currently serving network node. In some embodiments, in response to determining that the second PRACH transmission comprises a beam failure recovery based on contention based random access (CBRA), the method further includes dropping the first uplink transmission to the non-serving candidate target network node and providing a second uplink transmission to the currently serving network node.

[0014] In some embodiments, wherein the first uplink transmission comprises a first PRACH transmission or an SRS transmission, and the second uplink transmission comprises a second PRACH transmission, the method further comprises determining (i) that the current serving network node is experiencing beam failure recovery for at least one transmission / response point (TRP), and (ii) that the current serving network node comprises at least one additional TRP having an available link. In some embodiments, in response to determining that the current serving network node is experiencing beam failure recovery for at least one transmission / response point (TRP), and that the current serving network node comprises at least one additional TRP having an available link (e.g., and in performance of the responsive action), the method comprises dropping the first uplink transmission to the non-serving candidate target network node, and providing the second uplink transmission to the current serving network node. In some embodiments, the method further comprises determining, based at least in part on the second uplink transmission data, a power headroom report (PHR) reporting type associated with the second uplink transmission, wherein the PHR reporting type associated with the second uplink transmission is aperiodic. In some embodiments, in response to determining that the power headroom report (PHR) reporting type associated with the second uplink transmission is aperiodic (e.g., and in performance of the responsive action), the method further comprises dropping the first uplink transmission to the non-serving candidate target network node, and providing the second uplink transmission to the current serving network node.

[0015] In some embodiments, the method further comprises determining, based at least in part on the second uplink transmission data, that the second uplink transmission comprises a hybrid automatic repeat request acknowledgement (HARQ-ACK) retransmission. In some embodiments, in response to determining that the second uplink transmission comprises a hybrid automatic repeat request acknowledgement (HARQ-ACK) retransmission (e.g., and in performance of the responsive action), the method further comprises dropping the first uplink transmission to the non-serving candidate target network node, and providing the second uplink transmission to the current serving network node.

[0016] As also described below, in some embodiments, one or more operations of the above-described methods are performed by an apparatus comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to perform the one or more operations. For example, an apparatus can comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to (i) obtain first uplink transmission data indicative of a first uplink transmission for transmission via a user equipment to a non-serving candidate target network node, (ii) obtain second uplink transmission data indicative of a second uplink transmission for transmission via the user equipment to a currently serving network node, (iii) determine, based at least in part on the first uplink transmission data and the second uplink transmission data, a transmission conflict between the first uplink transmission and the second uplink transmission, and (iv) perform, based at least in part on the transmission conflict, a responsive action corresponding to the first uplink transmission and the second uplink transmission. In the same example, the apparatus can also perform other operations and / or embody additional aspects of the above-described methods.

[0017] In various embodiments, as also described below, provided herein is a computer program product comprising at least one non-transitory computer-readable storage medium having computer-executable program code instructions stored therein, the computer-executable program code instructions comprising program code instructions configured to perform one or more operations and / or embody additional aspects of the above-described methods. For example, a computer program product can comprise at least one non-transitory computer-readable storage medium having computer-executable program code instructions stored therein, the computer-executable program code instructions comprising program code instructions configured to (i) obtain first uplink transmission data indicative of a first uplink transmission for transmission via a user equipment to a non-serving candidate target network node, (ii) obtain second uplink transmission data indicative of a second uplink transmission for transmission via the user equipment to a currently serving network node, (iii) determine, based at least in part on the first uplink transmission data and the second uplink transmission data, a transmission conflict between the first uplink transmission and the second uplink transmission, and (iv) perform, based at least in part on the transmission conflict, a responsive action corresponding to the first uplink transmission and the second uplink transmission. In the same example, the program code instructions can also be configured to perform additional operations and / or embody additional aspects of the above-described methods.

[0018] In various embodiments, one or more operations of the above-described methods are performed by an apparatus having components for performing the one or more operations, as also described below. For example, an apparatus can include (i) means for obtaining first uplink transmission data indicative of a first uplink transmission for transmission via a user equipment to a non-serving candidate target network node, (ii) means for obtaining second uplink transmission data indicative of a second uplink transmission for transmission via the user equipment to a currently serving network node, (iii) means for determining, based at least in part on the first uplink transmission data and the second uplink transmission data, a transmission conflict between the first uplink transmission and the second uplink transmission, and (iv) means for performing, based at least in part on the transmission conflict, a responsive action corresponding to the first uplink transmission and the second uplink transmission. In the same example, the apparatus can embody additional aspects and / or include additional components for performing additional operations of the above-described methods. BRIEF DESCRIPTION OF DRAWINGS

[0019] Having generally described an example embodiment of the present disclosure, reference will now be made to the accompanying drawings, which are not necessarily drawn to scale, and wherein:

[0020] Figure 1 FIGURE 1 illustrates an example of a communication system in which example embodiments of the present disclosure can be implemented;

[0021] Figure 2 FIGURE 2 illustrates a block diagram of an apparatus that can be configured in accordance with example embodiments of the present disclosure;

[0022] Figures 3A-3B FIGURE 3 illustrates a signal diagram for Layer 1, Layer 2 triggered mobility (LTM) handover in accordance with example embodiments of the present disclosure;

[0023] Figure 4 is an example flow diagram of a transmission prioritization procedure in accordance with example embodiments of the present disclosure; and

[0024] Figures 5-20 FIGURE 5 illustrates an example transmission prioritization workflow implemented by an apparatus in accordance with one or more example embodiments of the present disclosure. DETAILED DESCRIPTION

[0025] Some embodiments will be described below with reference to the accompanying drawings, in which some but not all embodiments are shown. Indeed, various embodiments can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. Like reference numerals are used throughout the drawings to refer to like elements. As used in herein, the terms "data," "content," "information," and similar terms can be used interchangeably to refer to the data being sent, received, and / or stored according to the described embodiments. Thus, use of any such terms should not be taken to limit the spirit and scope of the embodiments.

[0026] Additionally, as used herein, the term "circuitry" refers to (a) hardware-only circuitry (e.g., comprising merely analogue and / or digital circuitry inputted into and operated entirely analogically and / or digitally), (b) a combination of hardware circuits and one or more computer program products having software and / or firmware instructions stored in that are executed by the hardware circuits to make the device implement one or more functions described herein, and (c) a combination of circuitry such as, e.g., a microprocessor(s) or a portion of a microprocessor(s), that requires software or firmware for operation even if the software or firmware is not physically present. This definition of "circuitry" applies to all uses of this term herein, including in any claims. As a further example, as used herein, the term "circuitry" also includes an implementation comprising one or more processors and / or portions thereof and accompanying software and / or firmware. As another example, the term "circuitry" as used herein also includes, for example, a baseband integrated circuit or application processor integrated circuit for a mobile phone, or similar integrated circuits in server, cellular network device, other network device (such as a core network device), field-programmable gate array(s), and / or other computing devices.

[0027] The term "comprising" means including, but not limited to, in the context of a patent application, and should be interpreted in the manner intended by the patentee as set out in the rule of construction for patent claims as explained during the prosecution of a patent application. The use of the more expansive terms "comprises", "comprising", "includes", "including" and "having" should be understood to provide support for narrower terminology such as "consisting of", "consisting essentially of", and "substantially comprising". In addition, where the use of the terms "includes" and "including" and variations thereof are used in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term "comprising".

[0028] The phrases "in one embodiment", "according to one embodiment", "in some embodiments", "in various embodiments", and the like, generally mean that the particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of the present disclosure, but not necessarily in all embodiments of the present disclosure. Thus, such phrases do not necessarily refer to the same embodiment. Further, the phrase "in one embodiment" is not necessarily referring to the same embodiment in every occurrence throughout the specification.

[0029] As used herein, the terms "example," "exemplary," and the like are utilized to merely refer to an example, instance, or illustration. Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects, or designs. Rather, the use of the terms "example," "exemplary," and the like are intended to present concepts in a concrete fashion.

[0030] If the specification states a component, feature, structure, or characteristic "may", "might", "could", "should", "can", "would", "typically", "optionally", "for example", "often", "e.g.", "for instance", "usually", "notably", or "possibly" (or any variant thereof) be included or have a particular property, that particular component, feature, structure, or characteristic is not required to be included or to have the particular property. Such components, features, structures, or characteristics can be optional in some embodiments, or can be excluded.

[0031] As used herein, the term "computer-readable medium" refers to signals, non- transitory computer-readable media, and the like. The term "non-transitory computer-readable medium" refers to a non-transitory storage of computer-executable instructions or software programs, hardware storage, non-transitory storage devices, or non-transitory computer system memory accessible by a controller, microcontroller, computing system, or module of a computing system. A non-transitory "computer-readable medium" can be accessed by a computing system or module of a computing system to retrieve and / or execute the computer-executable instructions or software programs coded thereon. Examples of non-transitory computer-readable media can include, without limitation, one or more types of hardware memory, non-transitory tangible media (e.g., one or more magnetic storage disks, one or more optical disks, one or more USB flash drives), computer system memory or random access memory (such as DRAM, SRAM, EDO RAM), and the like.

[0032] As Figure 1 As shown in FIG. 1, communication network 100 is provided in accordance with various embodiments of the present disclosure. In some embodiments, communication network 100 communicates with a plurality of user equipment (UE) 110. For example, network 100 can be deployed within a radio access architecture based on Long Term Evolution-Advanced (LTE-A) and / or New Radio (NR, 5G). However, the system can be deployed in other network architectures, including within other communication networks, including, for example, other communication networks developed in the future (e.g., a sixth generation (6G) network), as well as any of a number of existing networks, including Universal Mobile Telecommunications System (UMTS) Radio Access Network (UTRAN, e-UTRAN, or NG-RAN), Wireless Local Area Network (WLAN or WiFi), Worldwide Interoperability for Microwave Access (WiMAX), Bluetooth®, Personal Communications Service (PCS), ZigBee®, Wideband Code Division Multiple Access (WCDMA), systems using Ultra-Wide Band (UWB) technology, sensor networks, Mobile Ad-Hoc Networks (MANETs), and Internet Protocol Multimedia Subsystem (IMS) or any combination thereof.

[0033] UE 110 can be any type of user terminal, terminal device, or the like to which resources are allocated and designated on an air interface. For example, a UE can be a portable computing device such as a wireless mobile communication device, including, but not limited to, the following types of devices: a mobile station (mobile phone), a smartphone, a personal digital assistant (PDA), a cellular telephone, a device operating using a wireless modem (alarm or measurement device, etc.), a laptop and / or touch screen computer, a tablet, a game console, a notebook, and a multimedia device. A user equipment can also be referred to as a subscriber unit, mobile station, remote terminal, access terminal, user terminal, or user equipment (UE), to name only a few names or devices.

[0034] The network 100 can include a plurality of network devices, such as various network nodes. In some embodiments, the network 100 includes one or more network nodes that are currently serving one or more UEs 110 (e.g., referred to herein as “current serving network nodes” 120). In some embodiments, the current serving network nodes 120 can include one or more current serving cells. The current serving network nodes shown in the figure and described herein can also be referred to as distributed units, serving distributed units, or donor units. The current serving cells described herein can also be referred to as donor cells. In some embodiments, the network 100 includes one or more network nodes that are not currently serving one or more UEs 110 and that embody candidate targets for serving the one or more UEs 110 (e.g., referred to herein as “non-serving candidate target network nodes” 130). In some embodiments, the non-serving candidate target network nodes 130 can include one or more non-serving candidate target cells. The non-serving candidate target network nodes shown in the figure and described herein can also be referred to as candidate nodes or target nodes. In various embodiments, the present disclosure provides improved systems and techniques for prioritizing providing (e.g., transmitting) uplink transmissions to a current serving network node or providing uplink transmissions to a non-serving candidate target network node in the event of full or partial overlap between uplink transmissions.

[0035] Figure 2 An example apparatus 200 according to one embodiment is shown. The apparatus 200 can be an embodiment of, or can be embodied by, or otherwise associated with, a network device. For example, the apparatus can be embodied by, or otherwise associated with, an application function (AF), a multicast and broadcast session management function (MB-SMF), and / or a multicast and broadcast user plane function (MB-UPF).

[0036] Regardless of the device embodying the apparatus 200, the apparatus can include a processor 202, a memory 204, and a network interface 206. The apparatus 200 can be configured to perform the operations described herein. While these components are described with respect to the performance of various functions, it will be appreciated that particular implementations necessarily involve the use of particular hardware. It will also be appreciated that certain of these components can comprise similar or common hardware. For example, two sets of circuitry can both utilize the same processor, network interface, storage medium, etc. to perform their associated functions, such that duplicate hardware is not needed for each set of circuitry.

[0037] In some embodiments, the processor 202 (and / or co-processors or auxiliary processors or any other processing circuitry associated with the processor) can be in communication with a memory 204 via a bus for passing information among components of the device. The memory 204 is non-transitory and can include, for example, one or more volatile and / or non-volatile memories. In other words, for example, the memory 204 can be an electronic storage device (e.g., a non-transitory computer readable storage medium). The memory 204 can be configured to store information, data, content, applications, instructions, etc. for enabling the apparatus to perform various functions in accordance with the example embodiments disclosed herein.

[0038] The processor 202 can be embodied in a number of different ways, and example embodiments of the processor 202 can be implemented using hardware, software or a combination thereof. For example, the processor 202 can include one or more processors, operating systems, software, firmware, applications or code to implement some embodiments of the processor 202. Example processors include general purpose processors, application specific processors, and processors that control one or more functionalities of the apparatus. When the processor 202 is embodied by one or more processors, each processor can be a dedicated processor, a shared processor, a virtual processor, a multi-core processor, or any combination thereof.

[0039] In some embodiments, the processor 202 can be configured to execute instructions stored in the memory 204 and / or the circuitry accessible to the processor 202. In some embodiments, the processor 202 can be configured to execute hard coded functionality. As such, whether configured by hardware or software methods, or by a combination thereof, the processor 202 can represent an entity (for example, physically embodied in circuitry) capable of performing operations according to embodiments disclosed herein when configured accordingly. Alternatively, as another example, when the processor 202 is embodied as an executor of software instructions, the instructions can specifically configure the processor 202 to perform the algorithms and / or operations described herein when the instructions are executed.

[0040] In some embodiments, apparatus 200 can optionally include input / output circuitry, which in turn can be in communication with processor 202 to provide output to the user and / or to other entities and, in some embodiments, to receive an indication of input. The input / output circuitry can include a user interface and can include a display and can include a web user interface, a mobile application, a query initiation computing device, a kiosk, etc. In some embodiments, the input / output circuitry can also include a keyboard, a mouse, a joystick, a touchpad, a touch screen, soft keys, a microphone, a speaker, or other input / output mechanisms. The processor and / or user interface circuitry comprising the processor can be configured to control one or more functions of one or more user interface elements through computer program instructions (e.g., software and / or firmware) stored on a memory accessible to the processor (e.g., memory 204, etc.).

[0041] Network interface 206 can be any component that is configured to receive and / or transmit data from / to a network and / or any other device, circuitry, or module in communication with apparatus 200, such as embodied in hardware or a combination of hardware and software. In this regard, network interface 206 can include, for example, a network interface for enabling communication with a wired or wireless communication network, such as an application function (AF), a multicast and broadcast service function (MBSF), a multicast and broadcast user plane function (MB-UPF), and / or a multicast and broadcast session management function (MB-SMF). For example, network interface 206 can include one or more network interface cards, antennas, buses, switches, routers, modems, and supporting hardware and / or software, or any other devices suitable for enabling communications via a network. Additionally or alternatively, network interface 206 can include circuitry for interacting with one or more antennas to cause transmission of signals via the one or more antennas or to cause reception of signals via the one or more antennas.

[0042] Figures 3A-3B A signal diagram for Layer 1, Layer 2 Triggered Mobility (LTM) handover is shown in accordance with example embodiments of the present disclosure.

[0043] As Figure 3AAs shown, User Equipment (UE) 110, Current Serving Network Node 120, Non-Serving Candidate Target Network Node 130, and Centralized Unit 330 can execute a preparation sequence 300A for mobility handover. In some embodiments, UE 110 provides Layer 3 (L3) measurements (signal 1) to the serving cell 310 (also referred to as the source distributed unit (DU) in some embodiments) of the current serving network node 120. In some embodiments, the serving cell 310 forwards the L3 measurements to the Centralized Unit (CU) 330 (signal 2). In some embodiments, based on the L3 measurements, CU 330 generates a handover (HO) decision corresponding to cell preparation for mobility handover (block 3). In some embodiments, CU 330 configures the UE context in the target distributed unit (signals 4 to 5). In some embodiments, the current serving network node 120 and CU 330, as well as the non-serving candidate target network node 130 and CU 330, coordinate a timing advance acquisition method during the LTM preparation phase (e.g., signals 4 to 5). In some embodiments, CU 330 communicates with the current serving network node 120 (e.g., signal 6 to signal 7) for modifying the user equipment (UE) context as needed and for providing candidate target network node information (e.g., target cell RS configuration, TCI status, etc.).

[0044] In some embodiments, CU 330 generates a Radio Resource Control (RRC) reconfiguration message for the cell of a non-serving candidate target network node 130 preparing for mobility handover (e.g., block 8). In some embodiments, CU 330 forwards the RRC reconfiguration message for the cell preparing for handover to the current serving network node 120 using downlink (DL) RRC message transmission (e.g., signal 9). In some embodiments, the current serving network node 120 forwards the RRC reconfiguration message to UE 110 (e.g., signal 10). In some embodiments, UE 110 responds to CU 330 with an RRC reconfiguration completion (e.g., signals 11 to 12), which may include intermediate communication via the current serving network node 120.

[0045] like Figure 3B As shown, User Equipment (UE) 110, Current Serving Network Node 120, Non-Serving Candidate Target Network Node 130, and Central Unit 330 can execute an execution sequence 300B for mobility handover, which may include optional random access subsequences (e.g., signals 19 to 20) and completion subsequences (e.g., signals 21 to 25).

[0046] In some embodiments, based on the user equipment configuration, the UE 110 provides periodic Layer 1 (L1) reporting (e.g., signal 13) to the current serving network node 120. In some embodiments, based on the received L1 measurement report, the current serving network node 120 triggers the UE 110, such as by sending a physical downlink control channel (PDCCH) order, to acquire timing advance for a candidate cell set of non-serving candidate target network nodes 130 for mobility handover (e.g., block 14 to block 15). In some embodiments, the UE 110 can use various mechanisms to acquire the timing advance of the candidate cell of the non-serving candidate target network nodes 130. For example, a PDCCH order based mechanism based on random access channel (RACH), such as a receive (Rx) timing difference based, RACH-less mechanism (e.g., in long term evolution (LTE)), or a sounding reference signal (SRS) based timing advance acquisition mechanism can be used.

[0047] In some embodiments, the timing advance (TA) acquisition operations associated with the preparation sequence of block 8, the execution sequence of block 14, and / or the execution sequence of block 15 can include sending uplink transmissions to the non-serving candidate target network nodes 130 and / or the current serving network node 120. In some embodiments, full or partial overlap (e.g., in time and / or number of symbols) of the uplink transmissions to the non-serving candidate target network nodes 130 and the current serving network node 120, which can correspond to a transmission conflict (e.g., conflict, overlap, etc.), requires prioritizing sending the uplink transmission to the current serving network node 120 and dropping (e.g., not sending or delaying transmission of) the uplink transmission to the non-serving candidate target node 130. In some embodiments, Figure 3A the preparation sequence 300A and / or Figure 3B the execution sequence 300B includes the UE 110 performing uplink transmission prioritization processing, such as the uplink transmission prioritization process 400 as shown in Figure 4 and described herein. In one example, the UE 110 automatically performs the transmission prioritization process in response to determining overlap of uplink transmissions. Additional illustrations and descriptions of examples of the transmission prioritization process and workflow are shown in Figure 4 and Figures 5-20 and provided herein.

[0048] In some embodiments, the UE 110 continues L1 measurement reporting. In some embodiments, after the current serving network node 120 determines that the UE 110 should be handed over to a cell (e.g., a target cell) of another network node (e.g., a non-serving candidate target network node 130), the current serving network node 120 triggers a network node and cell handover using a cell handover command (e.g., a medium access control (MAC) control element (CE)) (e.g., signal 16, block 17, and signal 18). In some embodiments, the UE 110 applies the RRC configuration for the target cell of the non-serving candidate target network node 130 indicated by the cell handover command (e.g., via the MAC CE) and hands over to the non-serving candidate target network node 130. In some embodiments, the UE 110 is configured to perform a random access (RA) to the target cell, as shown in signals 19-20 of performing sequence 300B. Alternatively, in some embodiments, the UE 110 can be configured to not perform a RA to the target cell, as the non-serving candidate target network node 130 can have acquired the timing advance of the target cell (e.g., LTM without RACH). In some embodiments, to initiate communication with the non-serving candidate target network node 130, the UE 110 sends an RRC reconfiguration complete to the target cell of the non-serving candidate target network node 130 using the already configured uplink (UL) resources, which can be forwarded to the centralized unit control plane (CP) of the CU 330 (e.g., signals 21-22). In some embodiments, the CU 330 releases the user equipment context from the current serving network node 120 with a user equipment context release request and performs a path switch to the non-serving candidate target network node 130 (e.g., signals 23-25).

[0049] Referring now to Figure 4 , an example flowchart of an uplink transmission prioritization procedure 400 is shown, which can be performed by an apparatus 200 such as Figure 2 (e.g., which can include a user equipment (UE) 110 as shown in Figure 1 ).

[0050] In some embodiments, at block 403, the apparatus performing process 400 includes means, such as processor 202, memory 204, network interface 206, etc., for obtaining first uplink transmission data. In some embodiments, the first uplink transmission data indicates a first uplink transmission for transmission via the apparatus to the non-serving candidate target network node. Non-limiting examples of the first uplink transmission include a PRACH transmission (e.g., a PDCCH order or DCI trigger), an SRS transmission, and / or a PUSCH or PUCCH transmission. In some embodiments, the first uplink transmission data indicates (e.g., or the second uplink transmission includes) a priority index for the first uplink transmission, which indicates, for example, a priority of the first uplink transmission. In some embodiments, the first uplink transmission data indicates whether the first uplink transmission indicates a retransmission, an initial transmission, a new transmission, etc. In some embodiments, the first uplink transmission includes a particular number of symbols, which can be compared by the apparatus to a threshold number of symbols (e.g., N symbols). In some embodiments, the apparatus (e.g., user equipment) obtains the first uplink transmission data from a centralized unit, such as centralized unit 330. In some embodiments, the first uplink transmission data indicates (e.g., or the first uplink transmission includes) one or more of: an interruption due to processing time to construct the uplink transmission, a carrier, and / or BWP switching time, an uplink or downlink radio frequency (RF) retuning time, and any additional preparation time associated with the first uplink transmission.

[0051] In some embodiments, at block 406, the apparatus performing process 400 includes means, such as processor 202, memory 204, network interface 206, etc., for obtaining second uplink transmission data. In some embodiments, the second uplink transmission data indicates a second uplink transmission for transmission via the apparatus to the current serving network node. Non-limiting examples of the second uplink transmission include: a PUSCH or PUCCH transmission carrying HARQ-ACK, a PUSCH or PUCCH transmission carrying HARQ-ACK retransmission, a PUSCH or PUCCH transmission carrying positive SR, positive RI, positive CRI, and / or positive SSBRI, a PRACH transmission (e.g., such as a PDCCH ordered PRACH transmission or a DCI triggered PRACH transmission), a PUCCH or PUSCH transmission carrying periodic / semi-persistent CSI including CQI, PMI, L1-RSRP, and / or L1-SINR, a sounding reference signal (SRS) transmission (e.g., for TA advance acquisition in LTM), a PRACH transmission based on CBRA, a beam failure recovery transmission based on PRACH CBRA, and / or a PRACH CFRA transmission. In some embodiments, the second uplink transmission data indicates (e.g., and / or the second uplink transmission includes) a priority index for the second uplink transmission, which indicates, for example, a priority of the second uplink transmission. In some embodiments, the second uplink transmission includes a second particular number of symbols. In some embodiments, the apparatus (e.g., user equipment) obtains the second uplink transmission data from a centralized unit, such as centralized unit 330.

[0052] In some embodiments, at block 409, the apparatus performing process 400 includes means, such as processor 202, memory 204, network interface 206, etc., for identifying whether the first uplink transmission and the second uplink transmission exhibit a threshold number of symbol overlaps and / or a threshold time gap therebetween. In some embodiments, the apparatus performs the operations of block 409 based at least in part on the first uplink transmission data and the second uplink transmission data. In various embodiments, as an overlap rule for single serving cell operation or for operation with carrier aggregation in the same frequency band, a user equipment does not transmit PRACH and PUSCH / PUCCH / SRS transmissions in the same slot, or when the gap between the first or last symbol of the PRACH transmission in the first slot and the last or first symbol of the PUSCH / PUCCH / SRS transmission in the second slot is less than N symbols, respectively, for μ = 0 or μ = 1, N = 2, for μ = 2 or μ = 3,N = 4, for μ = 5, N = 16, for μ = 6, N = 32, and μ is a subcarrier spacing (SCS) configuration for an active uplink (UL) bandwidth part (BWP). In some embodiments, for a PUSCH transmission with repetition Type B, the overlap rule applies for each actual repetition of the PUSCH transmission. In various embodiments, in repetition Type B for a PUSCH transmission, (i) the demodulation reference signal (DMRS) location is fixed to the first symbol of the allocated PUSCH, (ii) the PUSCH starting symbol is 0 to 13 in case of normal cyclic prefix (CP) and 0 to 12 in case of extended CP, and the PUSCH length is 1 to 14 in case of normal CP and 1 to 12 in case of extended CP.

[0053] In some embodiments, the apparatus includes means for storing a threshold number of symbol overlaps and / or a threshold time gap, such as memory 204; and / or means for receiving a threshold number of symbol overlaps and / or a threshold time gap, such as network interface 206. In some embodiments, the apparatus compares the first uplink transmission to the second uplink transmission and determines a number of symbol overlaps based on the comparison. In some embodiments, the apparatus identifies whether the determined number of symbol overlaps meets or exceeds a threshold number of overlaps (e.g., which can include 1, 2, 4, or any suitable number of overlaps). In some embodiments, by comparing a number of symbols of the first uplink transmission to a number of symbols of the second uplink transmission, or by comparing a number of any symbol to a threshold number of symbols (e.g., N symbols), the apparatus identifies whether the first uplink transmission and the second uplink transmission are within a threshold time gap.

[0054] In some embodiments, in response to identifying that the first uplink transmission and the second uplink transmission exhibit at least one of a threshold number of symbol overlaps or a threshold time gap, process 400 continues to block 412. In some embodiments, in response to identifying that the first uplink transmission and the second uplink transmission do not exhibit a threshold number of symbol overlaps or a threshold time gap, process 400 continues to block 410, where the apparatus performing process 400 includes means for transmitting the first uplink transmission to a non-serving candidate target network node and the second uplink transmission to a currently serving network node, such as processor 202, memory 204, network interface 206, etc.

[0055] In some embodiments, at block 412, the apparatus performing process 400 includes means, such as processor 202, memory 204, network interface 206, etc., for determining a transmission conflict between the first uplink transmission and the second uplink transmission. In one example, the apparatus can determine the transmission conflict in response to identifying at least one symbol overlap between the first uplink transmission and the second uplink transmission. In another example, the apparatus can determine the transmission conflict in response to identifying a time gap between the first uplink transmission and the second uplink transmission that is below a predetermined threshold.

[0056] In some embodiments, at block 415, the apparatus performing process 400 includes means, such as processor 202, memory 204, network interface 206, etc., for determining one or more response actions for responding to the transmission conflict. In some embodiments, the response actions include (i) dropping (e.g., not transmitting or delaying transmission of) the first uplink transmission to the non-serving candidate target network node and providing (e.g., transmitting) the second uplink transmission to the current serving network node, or (ii) providing the first uplink transmission to the non-serving candidate target network node and dropping the second uplink transmission to the current serving network node. In various embodiments, the determination of whether to transmit or drop transmissions to the current serving network node and the non-serving candidate target network node is referred to as uplink transmission prioritization. In some embodiments, the apparatus determines the response action based on one or more aspects (such as type and / or content) of the second uplink transmission and / or the first uplink transmission. Additionally or alternatively, in some embodiments, the apparatus determines the response action based on one or more states of the current serving network node or the non-serving target candidate network node.

[0057] In some embodiments, in case of a transmission collision (e.g., overlap in symbols and / or time) between the first uplink transmission and the second uplink transmission to the current serving network node, the apparatus determines to drop the first uplink transmission to the non-serving candidate target network node and provide the second uplink transmission to the current serving network node. In some embodiments, in response to determining that the second uplink transmission includes at least one of: a physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH) transmission carrying a hybrid automatic repeat request acknowledgement (HARQ-ACK), or a PUSCH / PUCCH transmission carrying a positive scheduling request (SR), a positive rank indicator (RI), a positive channel state information reference signal (CSI-RS) resource indicator (CRI), and / or a positive synchronization signal block rank indicator (SSBRI), or a physical random access channel (PRACH) transmission, the apparatus determines to drop the first uplink transmission to the non-serving candidate target network node and provide the second uplink transmission to the current serving network node. In some embodiments, in response to determining that the second uplink transmission includes at least one of: a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI, or a PRACH transmission, the apparatus determines to provide the first uplink transmission to the non-serving target candidate network node and drop the second uplink transmission to the current serving network node. In some embodiments, only when the second uplink transmission includes a HARQ-ACK (e.g., because a delay in the HARQ-ACK can cause a retransmission), the apparatus determines to drop the first uplink transmission to the non-serving target candidate network node and provide the second uplink transmission to the current serving network node.

[0058] In some embodiments, in response to determining that the second uplink transmission includes at least one of: a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI, or a PUSCH or PUCCH transmission carrying a HARQ-ACK, the apparatus determines to provide the first uplink transmission to the non-serving target candidate network node and drop the second uplink transmission to the current serving network node. In some embodiments, only when the second uplink transmission includes a PRACH transmission, the apparatus determines to drop the first uplink transmission to the non-serving target candidate network node and provide the second uplink transmission to the current serving network node. In some embodiments, only when the second uplink transmission includes a PRACH transmission to a primary cell of the current serving network node, the apparatus determines to drop the first uplink transmission to the non-serving target candidate network node and provide the second uplink transmission to the current serving network node.

[0059] In some embodiments, in response to determining that the second uplink transmission comprises a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI, the apparatus determines to provide the first uplink transmission to the non-serving target candidate network node and drop the second uplink transmission to the current serving network node. In some embodiments, in response to determining that the second uplink transmission comprises at least one of: (i) a PUSCH transmission carrying an aperiodic CSI; (ii) a PUCCH or PUSCH transmission carrying a periodic channel state information (CSI) or semi-CSI, at least one of the periodic CSI or semi-persistent CSI comprising at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a layer 1 reference signal received power (L1-RSRP), or a layer 1 signal to interference plus noise ratio (L1-SINR); or a sounding reference signal (SRS) transmission, the apparatus determines to provide the first uplink transmission to the non-serving target candidate network node and drop the second uplink transmission to the current serving network node. In some embodiments, the apparatus determines to drop the first uplink transmission to the non-serving target candidate network node and provide the second uplink transmission to the current serving network node only when the second transmission uplink comprises a PUSCH transmission carrying an aperiodic CSI.

[0060] In some embodiments, in which the second uplink transmission comprises a PUSCH transmission or a PUCCH transmission, in response to determining at least one of: (i) a priority index of the second uplink transmission exceeds a priority index of the first uplink transmission, or (ii) a priority index of the second uplink transmission exceeds a predetermined threshold, the apparatus determines to drop the first uplink transmission to the non-serving target candidate network node and provide the second uplink transmission to the current serving network node. For example, in case of PRACH transmission and PUCCH / PUSCH transmission overlap and PUCCH / PUSCH is used for ultra-reliable low latency communications (URLLC), extended reality (XR) uplink traffic including a higher priority index, the PRACH transmission to the non-serving candidate target network node can be dropped and the PUCCH / PUSCH transmission to the current serving network node can be provided. In some embodiments, in response to determining or confirming that the apparatus (e.g., a user equipment if separate from the apparatus) is provided with an active or indicated transmission configuration indicator (TCI) state for the non-serving candidate target network node, the apparatus determines to provide the first uplink transmission to the non-serving target candidate network node and drop the second uplink transmission to the current serving network node.

[0061] In some embodiments, in response to determining the presence of downlink timing synchronization between the non-serving candidate target network node and the apparatus (e.g., a user equipment if separate from the apparatus), the apparatus determines to provide the first uplink transmission to the non-serving candidate target network node and drop the second uplink transmission to the current serving network node. In some embodiments, where the first uplink transmission comprises a PRACH transmission triggered by a physical downlink control channel (PDCCH) order, in response to determining that the PDCCH order indicates at least one of: a retransmission, an initial transmission, or a new transmission, the apparatus determines to provide the first uplink transmission to the non-serving target candidate network node and drop the second uplink transmission to the current serving network node.

[0062] In some embodiments, the first uplink transmission comprises a first physical random access channel (PRACH) transmission and the second uplink transmission comprises a second PRACH transmission. In some embodiments, in response to determining that at least one primary cell of the current serving network node is experiencing beam failure recovery, the apparatus determines to drop the first uplink transmission to the non-serving target candidate network node and provide the second uplink transmission to the current serving network node. In some embodiments, in response to determining (i) at least one secondary cell of the current serving network node is experiencing beam failure recovery and (ii) a primary cell of the current serving network node is not experiencing beam failure recovery, the apparatus determines to provide the first uplink transmission to the non-serving target candidate network node and drop the second uplink transmission to the current serving network node. In some embodiments, in response to determining that the apparatus (e.g., a user equipment if separate from the apparatus) has triggered a maximum permissible exposure (MPE) report, the apparatus determines to drop the first uplink transmission to the non-serving target candidate network node and provide the second uplink transmission to the current serving network node. In some embodiments, in response to determining that the second uplink transmission (e.g., the second PRACH transmission) comprises a contention-based random access (CBRA) based beam failure recovery or a contention free random access (CFRA) transmission, the apparatus determines to drop the first uplink transmission to the non-serving target candidate network node and provide the second uplink transmission to the current serving network node. In some embodiments, in response to determining (i) the current serving network node is experiencing beam failure recovery for at least one transmission / response point (TRP) and (ii) the current serving network node comprises at least one additional TRP with a usable link, the apparatus determines to provide the first uplink transmission to the non-serving target candidate network node and drop the second uplink transmission to the current serving network node.

[0063] In some embodiments, in response to determining that a power headroom report (PHR) report type associated with the second uplink transmission is aperiodic based at least in part on the second uplink transmission data, the apparatus determines to drop the first uplink transmission to the non-serving target candidate network node and provide the second uplink transmission to the current serving network node. In some embodiments, in response to determining that the second uplink transmission includes a hybrid automatic repeat request acknowledgement (HARQ-ACK) retransmission, the apparatus determines to drop the first uplink transmission to the non-serving target candidate network node and provide the second uplink transmission to the current serving network node.

[0064] In some embodiments, at block 418, the apparatus performing process 400 includes means, such as processor 202, memory 204, network interface 206, etc., for performing the response action(s) determined at block 415. In some embodiments, based on one or more determinations described herein, the apparatus (i) provides the first uplink transmission to the non-serving target candidate network node and drops the second uplink transmission to the current serving network node, or (ii) drops the first uplink transmission to the non-serving target candidate network node and provides the second uplink transmission to the current serving network node.

[0065] Figure 5 An example prioritization workflow 500 that can be implemented by an apparatus according to one or more example embodiments of the present disclosure is shown. In some embodiments, as shown in Figure 5 In some embodiments, the workflow 500 is performed by a user equipment (UE), such as the apparatus, and more specifically, a processor. In some embodiments, the UE performs the workflow 500 to prioritize (e.g., drop or provide) uplink transmissions to a current serving network node or a non-serving candidate target network node in case of uplink transmission overlap.

[0066] In some embodiments, the UE generates or receives the first uplink transmission and the second uplink transmission. In some embodiments, based on the first uplink transmission and the second uplink transmission exhibiting a threshold number of symbol overlaps and / or a threshold time gap, the UE determines that the first uplink transmission and the second uplink transmission overlap (e.g., overlap in time, completely or partially). In some embodiments, in response to determining that the uplink transmissions overlap, the UE identifies a conflict between the first uplink transmission and the second uplink transmission. In some embodiments, in response to determining that the first uplink transmission is associated with a layer 1, layer 2 triggered mobility (LTM) candidate target network node that is not a current serving network node (e.g., for which timing advance is to be acquired), the UE determines to drop (e.g., not provide) the first uplink transmission from the overlapping uplink transmissions. For example, in response to determining that the first uplink transmission is associated with a non-serving candidate target network node, the UE can drop the first uplink transmission to the non-serving candidate target network node (e.g., a physical downlink control channel (PDCCH) order physical random access channel (PRACH) transmission) and provide the second uplink transmission to the current serving network node.

[0067] Figure 6 An example prioritization workflow 600 that can be implemented by an apparatus in accordance with one or more example embodiments of the disclosure is shown. In some embodiments, as shown in Figure 6 the workflow 600 is performed by a user equipment (UE) that can be configured to perform similar operations as the UE described with respect to the workflow 500 shown in Figure 5 In some embodiments, in response to determining a) an overlap between the first uplink transmission and the second transmission, and b) the second uplink transmission is at least one of: (i) a physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) transmission carrying a hybrid automatic repeat request acknowledgement (HARQ-ACK), (ii) a PUSCH / PUCCH transmission carrying a positive scheduling request (SR), a positive rank indicator (RI), a positive channel state information reference signal (CSI-RS) resource indicator (CRI), or a positive synchronization signal block rank indicator (SSBRI), or (iii) a PRACH transmission, the UE drops (e.g., does not provide) the first uplink transmission for the non-serving candidate target network node and provides the second uplink transmission to the current serving network node.

[0068] Figure 7 An example prioritization workflow 700 that can be implemented by an apparatus in accordance with one or more example embodiments of the disclosure is shown. In some embodiments, as shown in Figure 7 the workflow 700 is performed by a user equipment (UE) that can be configured to perform similar operations as the UE described with respect to the workflow 500 shown inFigure 5 similar operations as the UE described in connection with the workflow 500 shown in FIG. 8 and described herein. In some embodiments, in response to determining that a) there is an overlap between the first uplink transmission and the second uplink transmission, and b) the second uplink transmission is at least one of: (i) a PUSCH / PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, and / or a positive SSBRI, or (ii) a PRACH transmission, the UE provides the first uplink transmission for the non-serving candidate target network node and drops the second uplink transmission to the current serving network node.

[0069] Figure 8 An example prioritization workflow 800 that can be implemented by an apparatus in accordance with one or more example embodiments of the disclosure is shown. In some embodiments, as Figure 8 As shown in FIG. 8, the workflow 800 is performed by a user equipment (UE) that can be configured to perform similar operations as the UE described in connection with the workflow 500 shown in FIG. 7 and described herein. Figure 5 similar operations as the UE described in connection with the workflow 500 shown in FIG. 8 and described herein. In some embodiments, in response to determining that a) there is an overlap between the first uplink transmission and the second uplink transmission, and b) the second uplink transmission is a PUSCH / PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, and / or a positive SSBRI, the UE provides the first uplink transmission for the non-serving candidate target network node and drops the second uplink transmission to the current serving network node.

[0070] Figure 9 An example prioritization workflow 900 that can be implemented by an apparatus in accordance with one or more example embodiments of the disclosure is shown. In some embodiments, as Figure 9 As shown in FIG. 8, the workflow 900 is performed by a user equipment (UE) that can be configured to perform similar operations as the UE described in connection with the workflow 500 shown in FIG. 7 and described herein. Figure 5The operation is similar to that of the UE described in the workflow 500 shown and described herein. In some embodiments, in response to determining a) an overlap between a first uplink transmission and a second uplink transmission, and b) that the second uplink transmission is at least one of the following: (i) a PUSCH / PUCCH transmission carrying HARQ-ACK or HARQ-ACK retransmission, or (ii) a PRACH transmission, the UE discards only the first uplink transmission to a non-serving candidate target network node. Alternatively, in some embodiments, in response to determining a) an overlap between a first uplink transmission and a second uplink transmission, and b) that the second uplink transmission is a PUSCH / PUCCH transmission carrying HARQ-ACK or HARQ-ACK retransmission, the UE discards only the first uplink transmission to a non-serving candidate target network node. Alternatively, in some embodiments, in response to determining a) an overlap between a first uplink transmission and a second uplink transmission, and b) that the second uplink transmission is a PRACH transmission, the UE discards only the first uplink transmission to a non-serving candidate target network node.

[0071] Figure 10 An example prioritization workflow 1000, which can be implemented by an apparatus, is illustrated according to one or more example embodiments of the present disclosure. In some embodiments, such as Figure 10 As shown, workflow 1000 is executed by a user equipment (UE), which can be configured to execute tasks related to... Figure 5 The operation is similar to that of the UE described in the workflow 500 shown and described herein. In some embodiments, in response to determining a) an overlap between a first transmission and a second uplink transmission, and b) that the second uplink transmission is at least one of the following: (i) a PUSCH transmission carrying aperiodic channel state information (CSI), or (ii) a PUCCH / PUSCH transmission carrying periodic / semi-persistent CSI, which includes only channel quality indicator (CQI), precoding matrix indicator (PMI), layer 1 reference signal received power (L1-RSRP) and / or layer 1 signal-to-interference-plus-noise ratio (L1-SINR), or (iii) sounding reference signal (SRS) transmission, the UE provides a first uplink transmission for a non-serving candidate target network node and discards a second uplink transmission to the currently serving network node.

[0072] Figure 11 An example prioritization workflow 1100, which can be implemented by an apparatus according to one or more example embodiments of the present disclosure, is illustrated. In some embodiments, such as Figure 11 As shown, workflow 1100 is executed by a user equipment (UE), which can be configured to execute tasks related to... Figure 5The operation is similar to that of the UE described in the workflow 500 shown and described herein. In some embodiments, in response to determining a) an overlap between a first uplink transmission and a second transmission, and b) that the second uplink transmission is a PUSCH transmission carrying an aperiodic CSI, the UE discards (e.g., does not provide) the first uplink transmission for a non-serving candidate target network node and provides the second uplink transmission to the currently serving network node.

[0073] Figure 12 An example prioritization workflow 1200, which can be implemented by an apparatus, is illustrated according to one or more example embodiments of the present disclosure. In some embodiments, such as Figure 12 As shown, workflow 1200 is executed by a user equipment (UE), which can be configured to execute tasks related to... Figure 5 The operation is similar to that of the UE described in the workflow 500 shown and described herein. In some embodiments, in response to determining a) an overlap between a first uplink transmission and a second transmission, and b) that the second transmission is a PUCCH or / and PUSCH with a certain priority index (e.g., greater than a threshold and / or greater than the priority index of the first uplink transmission), the UE discards (e.g., does not provide) the first uplink transmission for a non-serving candidate target network node and provides the second uplink transmission to the currently serving network node. For example, a higher priority index can be configured for uplink transmissions associated with Ultra Reliable Low Latency Communication (URLLC) services.

[0074] Figure 13 An example prioritization workflow 1300, which can be implemented by an apparatus, is illustrated according to one or more example embodiments of the present disclosure. In some embodiments, such as Figure 13 As shown, workflow 1300 is executed by a user equipment (UE), which can be configured to execute tasks related to... Figure 5 The operation is similar to that of the UE described in the workflow 500 shown and described herein. In some embodiments, in response to the UE determining a) an overlap between a first uplink transmission and a second transmission, and b) that the Transport Configuration Indicator (TCI) state has been activated and / or indicated for a non-serving candidate target network node (e.g., or its cell) associated with the first uplink transmission, the first uplink transmission for the non-serving candidate target network node can be given higher priority (e.g., provided by the UE and discarded by the UE for the second uplink transmission to the currently serving network node).

[0075] Figure 14 An example prioritization workflow 1400, which can be implemented by an apparatus, is illustrated according to one or more example embodiments of the present disclosure. In some embodiments, such as Figure 14The workflow 1400 is performed by a user equipment (UE), which can be configured to perform similar operations as the UE described with respect to the workflow 500 shown in Figure 5 The UE performs similar operations as the UE described with respect to the workflow 500 shown in and described herein. In some embodiments, in response to the UE determining a) an overlap between the first uplink transmission and the second transmission, and b) a downlink synchronization has been maintained for a non-serving candidate target network node (e.g., or a cell thereof) associated with the first uplink transmission (which can be indicated in a PRACH preamble), the first uplink transmission for the non-serving candidate target network node can be given a higher priority (e.g., the second uplink transmission to the current serving network node is provided by the UE and dropped by the UE) where the first uplink transmission is a PRACH transmission.

[0076] Figure 15 An example prioritization workflow 1500 that can be implemented by an apparatus according to one or more example embodiments of the disclosure is shown. In some embodiments, as Figure 15 The workflow 1500 is performed by a user equipment (UE), which can be configured to perform similar operations as the UE described with respect to the workflow 500 shown in Figure 5 The UE performs similar operations as the UE described with respect to the workflow 500 shown in and described herein. In some embodiments, the first uplink transmission is a PDCCH ordered PRACH transmission. In some embodiments, in response to the UE determining a) an overlap between the first uplink transmission and the second transmission, and b) a PDCCH order of the PRACH transmission indicates a retransmission, an initial transmission, or a new transmission, the PRACH transmission for the non-serving candidate target network node is prioritized (e.g., the second uplink transmission to the current serving network node is provided by the UE and dropped by the UE).

[0077] Figure 16 An example prioritization workflow 1600 that can be implemented by an apparatus according to one or more example embodiments of the disclosure is shown. In some embodiments, as Figure 16 The workflow 1600 is performed by a user equipment (UE), which can be configured to perform similar operations as the UE described with respect to the workflow 500 shown in Figure 5 The UE performs similar operations as the UE described with respect to the workflow 500 shown in and described herein. In some embodiments, the first uplink transmission is a PRACH or SRS transmission. In some embodiments, in response to the UE determining a) an overlap between the first uplink transmission and the second transmission, and b) a beam failure recovery is recovering at least one primary cell of the current serving network node, the UE drops the first uplink transmission to the non-serving candidate target network node.

[0078] Figure 17An example prioritization workflow 1700 that can be implemented by an apparatus in accordance with one or more example embodiments of the disclosure is shown. In some embodiments, as shown in Figure 7 The workflow 1700 is performed by a user equipment (UE) that can be configured to perform similar operations as the UE described with respect to the workflow 500 shown in Figure 5 The workflow 1700 is performed by a user equipment (UE) that can be configured to perform similar operations as the UE described with respect to the workflow 500 shown in

[0079] Figure 18 An example prioritization workflow 1800 that can be implemented by an apparatus in accordance with one or more example embodiments of the disclosure is shown. In some embodiments, as shown in Figure 18 The workflow 1800 is performed by a user equipment (UE) that can be configured to perform similar operations as the UE described with respect to the workflow 500 shown in Figure 5 The workflow 1800 is performed by a user equipment (UE) that can be configured to perform similar operations as the UE described with respect to the workflow 500 shown in

[0080] Figure 19 An example prioritization workflow 1900 that can be implemented by an apparatus in accordance with one or more example embodiments of the disclosure is shown. In some embodiments, as shown in Figure 19 The workflow 1900 is performed by a user equipment (UE) that can be configured to perform similar operations as the UE described with respect to the workflow 500 shown in Figure 5The UE performs similar operations as described for the UE in connection with the workflow 500 shown in FIG. 6 and described herein. In some embodiments, the first uplink transmission is a PRACH or SRS transmission, and the second uplink node is a second PRACH transmission. In some embodiments, in response to determining that a) there is an overlap between the first uplink transmission and the second transmission, and b) the PRACH transmission for the current serving network node is a contention-based random access (CBRA) or contention-free random access (CFRA) transmission, the UE drops the first uplink transmission to the non-serving candidate target network node and provides the second uplink transmission to the current serving network node.

[0081] Figure 20 An example prioritization workflow 2000 that can be implemented by an apparatus in accordance with one or more example embodiments of the disclosure is shown. In some embodiments, as shown in FIG. 20, the workflow 2000 is performed by a user equipment (UE) that can be configured to perform similar operations as described for the UE in connection with the workflow 500 shown in FIG. 6 and described herein. Figure 20 In some embodiments, the UE performs similar operations as described for the UE in connection with the workflow 500 shown in FIG. 6 and described herein. In some embodiments, the first uplink transmission is a PRACH or SRS transmission. In some embodiments, in response to determining that a) there is an overlap between the first uplink transmission and the second transmission, and b) beam failure recovery is recovering one transmission / response point (TRP) of the current serving network node (e.g., one failed TRP with at least one other TRP at the current serving network node where the link is still available), the UE provides the first uplink transmission to the non-serving candidate target network node and drops the second uplink transmission to the current serving network node. Figure 5 In some embodiments, the UE performs similar operations as described for the UE in connection with the workflow 500 shown in FIG. 6 and described herein. In some embodiments, the first uplink transmission is a PRACH or SRS transmission. In some embodiments, in response to determining that a) there is an overlap between the first uplink transmission and the second transmission, and b) beam failure recovery is recovering one transmission / response point (TRP) of the current serving network node (e.g., one failed TRP with at least one other TRP at the current serving network node where the link is still available), the UE provides the first uplink transmission to the non-serving candidate target network node and drops the second uplink transmission to the current serving network node.

[0082] In various embodiments, methods, apparatuses, and computer program products of the disclosure are provided for prioritizing uplink transmissions to a current serving network node or a non-serving candidate target network node. The methods, apparatuses, and computer program products provide an improved solution to resolving uplink transmission conflicts at a user equipment. In various embodiments, the methods, apparatuses, and computer program products provide prioritization rules and procedures for determining whether to transmit (or drop) an uplink transmission to a non-serving candidate target network node or whether to transmit (or drop) an uplink transmission to a current serving network node in the event of uplink transmission overlap. In various embodiments, the methods, apparatuses, and computer program products improve telecommunication services by overcoming technical challenges associated with uplink transmission overlap, including but not limited to: avoiding retransmissions from occurring, considering beam failure recovery in prioritizing uplink transmissions, supporting priority-based transmission (or dropping) of overlapping uplink transmissions, each of which can reduce latency and / or disruption from occurring in telecommunication services.

[0083] It will be understood that each of the blocks of the flowcharts, and combinations of blocks in the flowcharts, illustrated herein and described above can be implemented by various means, such as hardware, firmware, processor, circuitry, and / or other communication devices including one or more program instructions on a computer-readable medium. For example, one or more of the procedures or operations described above can be embodied by computer program instructions. In this aspect, the computer program instructions which embody the procedures or operations described above can be stored by a memory 204 of an apparatus employing the disclosed embodiments, such as a user equipment (UE), and executed by a processor 202 in these apparatuses. As will be appreciated, any such computer program instructions can be loaded onto a computer or other programmable apparatus (e.g., hardware) to produce a machine, such that the resulting computer or other programmable apparatus implements the functions specified in the flowcharts' block(s). These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture that, when executed, implements the functions specified in the flowcharts' block(s). The computer program instructions can also be loaded onto a computer or other programmable apparatus to cause a series of operations to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions that are executed on the computer or other programmable apparatus provide operations for implementing the functions specified in the flowcharts' block(s).

[0084] Those of skill in the art will appreciate that many modifications and other embodiments can be made to the present disclosure herein described and illustrated, in accordance with the teachings and principles of the present disclosure. Accordingly, the present disclosure is not to be limited to the specific embodiments disclosed and described herein, and the modifications and other embodiments are intended to be included within the scope of the appended claims. Moreover, although the above description and associated figures set forth in the context of certain example combinations of elements and / or functions, it should be appreciated that alternative embodiments can provide functions and / or elements in different combinations and / or order than those explicitly described herein. In this regard, for example, aspects can be considered independent of the specific context in which they are described and / or illustrated herein. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A method comprising: obtaining first uplink transmission data indicative of a first uplink transmission for transmission via a user equipment to a non-serving candidate target network node; obtaining second uplink transmission data indicative of a second uplink transmission for transmission via the user equipment to a current serving network node; determining, based at least in part on the first uplink transmission data and the second uplink transmission data, a transmission collision between the first uplink transmission and the second uplink transmission; and performing, based at least in part on the transmission collision, a responsive action corresponding to the first uplink transmission and the second uplink transmission. at least one of:

2. The method of claim 1, wherein determining the transmission collision between the first uplink transmission and the second uplink transmission comprises: identifying, based at least in part on the first uplink transmission data and the second uplink transmission data, a threshold number of symbol overlaps between the first uplink transmission and the second uplink transmission; or identifying, based at least in part on the first uplink transmission data and the second uplink transmission data, a threshold time gap between the first uplink transmission and the second uplink transmission.

3. The method of claim 2, wherein: the second uplink transmission comprises at least one of: a physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH) transmission carrying a hybrid automatic repeat request acknowledgement (HARQ-ACK); a PUSCH or PUCCH transmission carrying a positive scheduling request (SR), a positive rank indicator (RI), a positive channel state information reference signal (CSI-RS) resource indicator (CRI), or a positive synchronization signal block rank indicator (SSBRI); or a physical random access channel (PRACH) transmission; and the responsive action comprises: dropping the first uplink transmission to the non-serving candidate target network node; and providing the second uplink transmission to the current serving network node.

4. The method of claim 2 or 3, wherein: the second uplink transmission comprises at least one of: a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI; or a PRACH transmission; and the responsive action comprises: dropping the second uplink transmission to the current serving network node; and providing the first uplink transmission to the non-serving candidate target network node.

5. The method of claim 2 or 3, wherein: the second uplink transmission comprises at least one of: a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI; or a PUSCH or PUCCH transmission carrying a HARQ-ACK; and the responsive action comprises: dropping the second uplink transmission to the current serving network node; and providing the first uplink transmission to the non-serving candidate target network node.

6. The method of claim 2, 3, 4, or 5, wherein: ​ The second uplink transmission comprises: a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI; and The response action comprises: dropping the second uplink transmission to the current serving network node; and providing the first uplink transmission to the non-serving candidate target network node.

7. The method of claim 2, wherein: The second uplink transmission comprises: at least one of: a PUSCH transmission carrying aperiodic CSI; a PUCCH or PUSCH transmission carrying at least one of periodic channel state information (CSI) or semi-CSI, wherein the at least one of the periodic CSI or the semi-persistent CSI comprises: at least one of: a channel quality indicator (CQI), a precoding matrix indicator (PMI), a layer 1 reference signal received power (Ll-RSRP), or a layer 1 signal to interference plus noise ratio (Ll-SINR); or a sounding reference signal (SRS) transmission; and The response action comprises: dropping the second uplink transmission to the current serving network node; and providing the first uplink transmission to the non-serving candidate target network node.

8. The method of claim 2 or 7, wherein: The second uplink transmission comprises: a PUSCH transmission carrying aperiodic CSI; and The response action comprises: dropping the first uplink transmission to the non-serving candidate target network node; and providing the second uplink transmission to the current serving network node.

9. The method of claim 2, wherein: The second uplink transmission comprises: at least one of a PUCCH transmission or a PUSCH transmission; The method further comprises: determining at least one of: (i) a priority index of the second uplink transmission exceeds a priority index of the first uplink transmission, or (ii) the priority index of the second uplink transmission exceeds a predetermined threshold; and The response action comprises: in response to the determining: dropping the first uplink transmission to the non-serving candidate target network node; and providing the second uplink transmission to the current serving network node.

10. The method of claim 2, further comprising: determining that the user equipment is provided with an active or indicated transmission configuration indicator (TCI) state for the non-serving candidate target network node, wherein the response action comprises: in response to the determining: dropping the second uplink transmission to the current serving network node; and providing the first uplink transmission to the non-serving candidate target network node.

11. The method of claim 2, further comprising: determining a presence of downlink timing synchronization between the non-serving candidate target network node and the user equipment, wherein the response action comprises: in response to the determining: dropping the second uplink transmission to the current serving network node; and providing the first uplink transmission to the non-serving candidate target network node.

12. The method of claims 1-11, wherein the first uplink transmission for transmission to the non-serving candidate target network node comprises: a PRACH transmission or a Sounding Reference Signal (SRS) transmission.

13. The method of claim 2, wherein: the first uplink transmission comprises a PRACH transmission triggered by a Physical Downlink Control Channel (PDCCH) order; the method further comprises determining that the PDCCH order indicates at least one of: a retransmission, an initial transmission, or a new transmission; and the responsive action comprises, in response to the determination: dropping the second uplink transmission to the current serving network node; and providing the first uplink transmission to the non-serving candidate target network node.

14. The method of claim 2, wherein: the first uplink transmission comprises a first PRACH transmission or a Sounding Reference Signal (SRS) transmission; the second uplink transmission comprises a second PRACH transmission; and the method further comprises: determining that at least one primary cell of the current serving network node is experiencing beam failure recovery; and in response to the determination, and in performance of the responsive action: dropping the first uplink transmission to the non-serving candidate target network node; and providing the second uplink transmission to the current serving network node.

15. The method of claim 2, wherein: the first uplink transmission comprises a first PRACH transmission or a Sounding Reference Signal (SRS) transmission; the second uplink transmission comprises a second PRACH transmission; and the method further comprises: determining that (i) at least one secondary cell of the current serving network node is experiencing beam failure recovery, and (ii) a primary cell of the current serving network node is not experiencing beam failure recovery; and in response to the determination, and in performance of the responsive action: dropping the second uplink transmission to the current serving network node; and providing the first uplink transmission to the non-serving candidate target network node.

16. The method of claim 2, wherein: the first uplink transmission comprises a first PRACH transmission or a Sounding Reference Signal (SRS) transmission; the second uplink transmission comprises a second PRACH transmission; and the method further comprises: determining that the user equipment has triggered a Maximum Power Reduction (MPR) report; and in response to the determination, and in performance of the responsive action: dropping the first uplink transmission to the non-serving candidate target network node; and providing the second uplink transmission to the current serving network node.

17. The method of claim 2, wherein: the first uplink transmission comprises a first PRACH transmission or a Sounding Reference Signal (SRS) transmission; the second uplink transmission comprises a second PRACH transmission; and the method further comprises: determining that the user equipment has triggered a Maximum Power Reduction (MPR) report; and in response to the determination, and in performance of the responsive action: determining that the second PRACH transmission comprises: a beam failure recovery based contention based random access (CBRA), or a contention free random access (CFRA) transmission; and in response to the determination, and in performance of the responsive action: dropping the first uplink transmission to the non-serving candidate target network node; and providing the second uplink transmission to the current serving network node.

18. The method of claim 2, wherein: the first uplink transmission comprises: a first PRACH transmission or a sounding reference signal (SRS) transmission; the second uplink transmission comprises: a second PRACH transmission; and the method further comprises: determining that (i) the current serving network node is experiencing a beam failure recovery for at least one transmission / response point (TRP), and (ii) the current serving network node comprises at least one additional TRP having an available link; and in response to the determination, and in performance of the responsive action: dropping the second uplink transmission to the current serving network node; and providing the first uplink transmission to the non-serving candidate target network node.

19. The method of 2, further comprising: determining, based at least in part on the second uplink transmission data, a power headroom report (PHR) reporting type associated with the second uplink transmission, wherein the PHR reporting type associated with the second uplink transmission is aperiodic; and in response to the determination, and in performance of the responsive action: dropping the first uplink transmission to the non-serving candidate target network node; and providing the second uplink transmission to the current serving network node.

20. The method of claim 2, further comprising: determining, based at least in part on the second uplink transmission data, that the second uplink transmission comprises a hybrid automatic repeat request acknowledgement (HARQ-ACK) retransmission; and in response to the determination, and in performance of the responsive action: dropping the first uplink transmission to the non-serving candidate target network node; and providing the second uplink transmission to the current serving network node.

21. The method of claims 1-21, wherein (i) the non-serving candidate target network node is a non-serving candidate target cell, and (ii) the current serving network node is a current serving cell.

22. An apparatus comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to: obtain first uplink transmission data indicative of a first uplink transmission for transmission via a user equipment to a non-serving candidate target network node; obtain second uplink transmission data indicative of a second uplink transmission for transmission via the user equipment to a current serving network node; ​ determine, based at least in part on the first uplink transmission data and the second uplink transmission data, a transmission collision between the first uplink transmission and the second uplink transmission; and perform, based at least in part on the transmission collision, a responsive action corresponding to the first uplink transmission and the second uplink transmission.

23. The apparatus of claim 22, wherein to determine the transmission collision between the first uplink transmission and the second uplink transmission, the instructions, when executed by the at least one processor, further cause the apparatus at least one of: identify, based at least in part on the first uplink transmission data and the second uplink transmission data, a threshold number of symbol overlaps between the first uplink transmission and the second uplink transmission; or identify, based at least in part on the first uplink transmission data and the second uplink transmission data, a threshold time gap between the first uplink transmission and the second uplink transmission.

24. The apparatus of claim 23, wherein: the second uplink transmission comprises at least one of: a physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH) transmission carrying a hybrid automatic repeat request acknowledgement (HARQ-ACK); a PUSCH or PUCCH transmission carrying a positive scheduling request (SR), a positive rank indicator (RI), a positive channel state information reference signal (CSI-RS) resource indicator (CRI), or a positive synchronization signal block rank indicator (SSBRI); or a physical random access channel (PRACH) transmission; and the instructions, when executed by the at least one processor, further cause the apparatus in performance of the responsive action to: drop the first uplink transmission to the non-serving candidate target network node; and provide the second uplink transmission to the current serving network node.

25. The apparatus of claim 23 or 24, wherein: the second uplink transmission comprises at least one of: a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI; or a PRACH transmission; and the instructions, when executed by the at least one processor, further cause the apparatus in performance of the responsive action to: drop the second uplink transmission to the current serving network node; and provide the first uplink transmission to the non-serving candidate target network node.

26. The apparatus of claim 23 or 24, wherein: the second uplink transmission comprises at least one of: a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI; or a PUSCH or PUCCH transmission carrying a HARQ-ACK; and the instructions, when executed by the at least one processor, further cause the apparatus in performance of the responsive action to: dropping the second uplink transmission to the current serving network node; and providing the first uplink transmission to the non-serving candidate target network node.

27. The apparatus of claim 23, 24, 25, or 26, wherein: the second uplink transmission comprises: a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI; and the instructions, when executed by the at least one processor, further cause the apparatus to, in performance of the responsive action: dropping the second uplink transmission to the current serving network node; and providing the first uplink transmission to the non-serving candidate target network node.

28. The apparatus of claim 23, wherein: the second uplink transmission comprises at least one of: a PUSCH transmission carrying an aperiodic CSI; a PUCCH or PUSCH transmission carrying at least one of a periodic channel state information (CSI) or a semi-CSI, wherein the at least one of the periodic CSI or the semi-persistent CSI comprises at least one of: a channel quality indicator (CQI), a precoding matrix indicator (PMI), a layer 1 reference signal received power (Ll-RSRP), or a layer 1 signal to interference plus noise ratio (Ll-SINR); or a sounding reference signal (SRS) transmission; and the instructions, when executed by the at least one processor, further cause the apparatus to, in performance of the responsive action: dropping the second uplink transmission to the current serving network node; and providing the first uplink transmission to the non-serving candidate target network node.

29. The apparatus of claim 23 or 28, wherein: the second uplink transmission comprises: a PUSCH transmission carrying an aperiodic CSI; and the instructions, when executed by the at least one processor, further cause the apparatus to, in performance of the responsive action: dropping the first uplink transmission to the non-serving candidate target network node; and providing the second uplink transmission to the current serving network node.

30. The apparatus of claim 23, wherein: the second uplink transmission comprises at least one of: a PUCCH transmission or a PUSCH transmission; and the instructions, when executed by the at least one processor, further cause the apparatus to: determine at least one of: (i) a priority index of the second uplink transmission exceeds a priority index of the first uplink transmission, or (ii) the priority index of the second uplink transmission exceeds a predetermined threshold, wherein in response to the determination, and in performance of the responsive action, the instructions cause the apparatus to: drop the first uplink transmission to the non-serving candidate target network node; and provide the second uplink transmission to the current serving network node.

31. The apparatus of claim 23, wherein the instructions, when executed by the at least one processor, further cause the apparatus to: determine that the user equipment is provided with an active or indicated transmission configuration indicator (TCI) state for the non-serving candidate target network node, wherein in response to the determination, and in performance of the responsive action, the instructions cause the apparatus to: drop the second uplink transmission to the current serving network node; and provide the first uplink transmission to the non-serving candidate target network node.

32. The apparatus of claim 23, wherein the instructions, when executed by the at least one processor, further cause the apparatus to: determine a presence of downlink timing synchronization between the non-serving candidate target network node and the user equipment, wherein in response to the determination, and in performance of the responsive action, the instructions cause the apparatus to: drop the second uplink transmission to the current serving network node; and provide the first uplink transmission to the non-serving candidate target network node.

33. The apparatus of claims 22-32, wherein the first uplink transmission for transmission to the non-serving candidate target network node comprises: a PRACH transmission or a sounding reference signal (SRS) transmission.

34. The apparatus of claim 23, wherein: the first uplink transmission comprises a PRACH transmission triggered by a physical downlink control channel (PDCCH) order; and the instructions, when executed by the at least one processor, further cause the apparatus to: determine that the PDCCH order indicates at least one of: a retransmission, an initial transmission, or a new transmission, wherein in response to the determination, and in performance of the responsive action, the instructions cause the apparatus to: drop the second uplink transmission to the current serving network node; and provide the first uplink transmission to the non-serving candidate target network node.

35. The apparatus of claim 23, wherein: the first uplink transmission comprises a first physical random access channel (PRACH) transmission or a sounding reference signal (SRS) transmission; the second uplink transmission comprises a second PRACH transmission; and the instructions, when executed by the at least one processor, further cause the apparatus to: determine that at least one primary cell of the current serving network node is experiencing beam failure recovery, wherein in response to the determination, and in performance of the responsive action, the instructions cause the apparatus to: drop the first uplink transmission to the non-serving candidate target network node; and provide the second uplink transmission to the current serving network node.

36. The apparatus of claim 23, wherein: the first uplink transmission comprises a first PRACH transmission or a sounding reference signal (SRS) transmission; the second uplink transmission comprises a second PRACH transmission; and the instructions, when executed by the at least one processor, further cause the apparatus to: determining (i) that at least one secondary cell of the current serving network node is experiencing beam failure recovery, and (ii) that a primary cell of the current serving network node is not experiencing beam failure recovery, wherein in response to the determining, and in performance of the responsive action, the instructions cause the apparatus to: drop the second uplink transmission to the current serving network node; and provide the first uplink transmission to the non-serving candidate target network node.

37. The apparatus of claim 23, wherein: the first uplink transmission comprises: a first PRACH transmission or a sounding reference signal (SRS) transmission; the second uplink transmission comprises: a second PRACH transmission; and the instructions, when executed by the at least one processor, further cause the apparatus to: determine that the user equipment has triggered a maximum permissible exposure (MPE) report, wherein in response to the determining, and in performance of the responsive action, the instructions cause the apparatus to: drop the first uplink transmission to the non-serving candidate target network node; and provide the second uplink transmission to the current serving network node.

38. The apparatus of claim 23, wherein: the first uplink transmission comprises: a first PRACH transmission or a sounding reference signal (SRS) transmission; the second uplink transmission comprises: a second PRACH transmission; and the instructions, when executed by the at least one processor, further cause the apparatus to: determine that the second PRACH transmission comprises: a contention-based random access (CBRA) based beam failure recovery, or a contention-free random access (CFRA) transmission, wherein in response to the determining, and in performance of the responsive action, the instructions cause the apparatus to: drop the first uplink transmission to the non-serving candidate target network node; and provide the second uplink transmission to the current serving network node.

39. The apparatus of claim 23, wherein: the first uplink transmission comprises: a first PRACH transmission or a sounding reference signal (SRS) transmission; the second uplink transmission comprises: a second PRACH transmission; and the instructions, when executed by the at least one processor, further cause the apparatus to: determine (i) that the current serving network node is experiencing beam failure recovery for at least one transmission / response point (TRP), and (ii) that the current serving network node comprises at least one additional TRP having an available link, wherein in response to the determining, and in performance of the responsive action, the instructions cause the apparatus to: drop the second uplink transmission to the current serving network node; and provide the first uplink transmission to the non-serving candidate target network node.

40. The apparatus of claim 23, wherein the instructions, when executed by the at least one processor, further cause the apparatus to: determine that the user equipment has triggered a maximum permissible exposure (MPE) report, wherein in response to the determining, and in performance of the responsive action, the instructions cause the apparatus to: drop the first uplink transmission to the non-serving candidate target network node; and provide the second uplink transmission to the current serving network node. determining, based at least in part on the second uplink transmission data, a power headroom report (PHR) reporting type associated with the second uplink transmission, wherein the PHR reporting type associated with the second uplink transmission is aperiodic, wherein in response to the determining, and in performance of the responsive action, the instructions cause the apparatus to: drop the first uplink transmission to the non-serving candidate target network node; and provide the second uplink transmission to the current serving network node.

41. The apparatus of claim 23, wherein the instructions, when executed by the at least one processor, further cause the apparatus to: determine, based at least in part on the second uplink transmission data, that the second uplink transmission comprises a hybrid automatic repeat request acknowledgement (HARQ-ACK) retransmission, wherein in response to the determining, and in performance of the responsive action, the instructions cause the apparatus to: drop the first uplink transmission to the non-serving candidate target network node; and provide the second uplink transmission to the current serving network node.

42. The apparatus of claims 22-41, wherein (i) the non-serving candidate target network node is a non-serving candidate target cell, and (ii) the current serving network node is a current serving cell.

43. A computer program product, comprising at least one non-transitory computer- readable storage medium having computer-executable program code instructions stored therein, the computer-executable program code instructions comprising: program code instructions configured to: obtain first uplink transmission data indicative of a first uplink transmission for transmission via a user equipment to a non-serving candidate target network node; obtain second uplink transmission data indicative of a second uplink transmission for transmission via the user equipment to a current serving network node; determine, based at least in part on the first uplink transmission data and the second uplink transmission data, a transmission conflict between the first uplink transmission and the second uplink transmission; and perform, based at least in part on the transmission conflict, a responsive action corresponding to the first uplink transmission and the second uplink transmission.

44. The computer program product of claim 43, wherein to determine the transmission conflict between the first uplink transmission and the second uplink transmission, the program code instructions are further configured to at least one of: identify, based at least in part on the first uplink transmission data and the second uplink transmission data, a threshold number of symbol overlaps between the first uplink transmission and the second uplink transmission; or identify, based at least in part on the first uplink transmission data and the second uplink transmission data, a threshold time gap between the first uplink transmission and the second uplink transmission.

45. The computer program product of claim 44, wherein: the second uplink transmission comprises at least one of: a physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH) transmission carrying a hybrid automatic repeat request acknowledgement (HARQ-ACK); or a sounding reference signal (SRS) transmission. a PUSCH or PUCCH transmission carrying a positive scheduling request (SR), a positive rank indicator (RI), a positive channel state information reference signal (CSI-RS) resource indicator (CRI), or a positive synchronization signal block rank indicator (SSBRI); or a physical random access channel (PRACH) transmission; and the program code instructions are further configured to, in the performance of the responsive action: drop the first uplink transmission to the non-serving candidate target network node; and provide the second uplink transmission to the current serving network node.

46. The computer program product of claim 44 or 45, wherein: the second uplink transmission comprises at least one of: a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI; or a PRACH transmission; and the program code instructions are further configured to, in the performance of the responsive action: drop the second uplink transmission to the current serving network node; and provide the first uplink transmission to the non-serving candidate target network node.

47. The computer program product of claim 44 or 45, wherein: the second uplink transmission comprises at least one of: a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI; or a PUSCH or PUCCH transmission carrying a HARQ-ACK; and the program code instructions are further configured to, in the performance of the responsive action: drop the second uplink transmission to the current serving network node; and provide the first uplink transmission to the non-serving candidate target network node.

48. The computer program product of claim 44, 45, 46, or 47, wherein: the second uplink transmission comprises a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI; and the program code instructions are further configured to, in the performance of the responsive action: drop the second uplink transmission to the current serving network node; and provide the first uplink transmission to the non-serving candidate target network node.

49. The computer program product of claim 44, wherein: the second uplink transmission comprises at least one of: a PUSCH transmission carrying an aperiodic CSI; a PUCCH or PUSCH transmission carrying at least one of a periodic channel state information (CSI) or a semi-CSI, wherein the at least one of the periodic CSI or the semi-persistent CSI comprises at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a layer 1 reference signal received power (Ll-RSRP), or a layer 1 signal to interference plus noise ratio (Ll-SINR); or a sounding reference signal (SRS) transmission; and the program code instructions are further configured to, in the performance of the responsive action: dropping the second uplink transmission to the current serving network node; and providing the first uplink transmission to the non-serving candidate target network node.

50. The computer program product of claim 44 or 49, wherein: the second uplink transmission comprises a PUSCH transmission carrying aperiodic CSI; and the program code instructions are further configured, in the execution of the responsive action: dropping the first uplink transmission to the non-serving candidate target network node; and providing the second uplink transmission to the current serving network node.

51. The computer program product of claim 44, wherein: the second uplink transmission comprises at least one of a PUCCH transmission or a PUSCH transmission; and the program code instructions are further configured: determining at least one of (i) a priority index of the second uplink transmission exceeds a priority index of the first uplink transmission or (ii) the priority index of the second uplink transmission exceeds a predetermined threshold, wherein in response to the determining, and in the execution of the responsive action, the instructions cause the apparatus to: drop the first uplink transmission to the non-serving candidate target network node; and provide the second uplink transmission to the current serving network node.

52. The computer program product of claim 44, wherein the program code instructions are further configured: determining that the user equipment is provided with an active or indicated transmission configuration indicator (TCI) state for the non-serving candidate target network node, wherein in response to the determining, and in the execution of the responsive action, the program code instructions are further configured: drop the second uplink transmission to the current serving network node; and provide the first uplink transmission to the non-serving candidate target network node.

53. The computer program product of claim 44, wherein the program code instructions are further configured: determining a presence of downlink timing synchronization between the non-serving candidate target network node and the user equipment, wherein in response to the determining, and in the execution of the responsive action, the program code instructions are further configured: drop the second uplink transmission to the current serving network node; and provide the first uplink transmission to the non-serving candidate target network node.

54. The computer program product of claims 43-52, wherein the first uplink transmission for transmission to the non-serving candidate target network node comprises: a PRACH transmission or a sounding reference signal (SRS) transmission.

55. The computer program product of claim 44, wherein: the first uplink transmission comprises a PRACH transmission triggered by a physical downlink control channel (PDCCH) order; and the program code instructions are further configured: determining that the PDCCH order indicates at least one of a retransmission, an initial transmission, or a new transmission, wherein in response to the determining, and in the execution of the responsive action, the program code instructions are further configured: dropping the second uplink transmission to the current serving network node; and providing the first uplink transmission to the non-serving candidate target network node.

56. The computer program product of claim 44, wherein: the first uplink transmission comprises: a first physical random access channel (PRACH) transmission or a sounding reference signal (SRS) transmission; the second uplink transmission comprises: a second PRACH transmission; and the program code instructions are further configured to: determine that at least one primary cell of the current serving network node is experiencing beam failure recovery, wherein in response to the determination, and in performance of the responsive action, the program code instructions are further configured to: drop the second uplink transmission to the current serving network node; and provide the first uplink transmission to the non-serving candidate target network node.

57. The computer program product of claim 44, wherein: the first uplink transmission comprises: a first PRACH transmission or a sounding reference signal (SRS) transmission; the second uplink transmission comprises: a second PRACH transmission; and the program code instructions are further configured to: determine that (i) at least one secondary cell of the current serving network node is experiencing beam failure recovery, and (ii) a primary cell of the current serving network node is not experiencing beam failure recovery, wherein in response to the determination, and in performance of the responsive action, the program code instructions are further configured to: drop the second uplink transmission to the current serving network node; and provide the first uplink transmission to the non-serving candidate target network node.

58. The computer program product of claim 44, wherein: the first uplink transmission comprises: a first PRACH transmission or a sounding reference signal (SRS) transmission; the second uplink transmission comprises: a second PRACH transmission; and the program code instructions are further configured to: determine that the user equipment has triggered a maximum permissible exposure (MPE) report, wherein in response to the determination, and in performance of the responsive action, the program code instructions are further configured to: drop the first uplink transmission to the non-serving candidate target network node; and provide the second uplink transmission to the current serving network node.

59. The computer program product of claim 44, wherein: the first uplink transmission comprises: a first PRACH transmission or a sounding reference signal (SRS) transmission; the second uplink transmission comprises: a second PRACH transmission; and the program code instructions are further configured to: determine that the second PRACH transmission comprises: a contention-based random access (CBRA) based beam failure recovery, or a contention-free random access (CFRA) transmission, wherein in response to the determination, and in performance of the responsive action, the program code instructions are further configured to: drop the first uplink transmission to the non-serving candidate target network node; and provide the second uplink transmission to the current serving network node. providing the second uplink transmission to the current serving network node.

60. The computer program product of claim 44, wherein: the first uplink transmission comprises a first PRACH transmission or a sounding reference signal (SRS) transmission; the second uplink transmission comprises a second PRACH transmission; and the program code instructions are further configured to: determine (i) that the current serving network node is experiencing beam failure recovery for at least one transmission / response point (TRP) and (ii) that the current serving network node comprises at least one additional TRP having an available link, wherein in response to the determination, and in performance of the responsive action, the program code instructions are further configured to: drop the second uplink transmission to the current serving network node; and provide the first uplink transmission to the non-serving candidate target network node.

61. The computer program product of claim 44, wherein the program code instructions are further configured to: determine, based at least in part on the second uplink transmission data, a power headroom report (PHR) reporting type associated with the second uplink transmission, wherein the PHR reporting type associated with the second uplink transmission is aperiodic, wherein in response to the determination, and in performance of the responsive action, the program code instructions are further configured to: drop the first uplink transmission to the non-serving candidate target network node; and provide the second uplink transmission to the current serving network node.

62. The computer program product of claim 44, wherein the program code instructions are further configured to: determine, based at least in part on the second uplink transmission data, that the second uplink transmission comprises a hybrid automatic repeat request acknowledgement (HARQ-ACK) retransmission, wherein in response to the determination, and in performance of the responsive action, the program code instructions are further configured to: drop the first uplink transmission to the non-serving candidate target network node; and provide the second uplink transmission to the current serving network node.

63. The computer program product of claim 43 to 62, wherein (i) the non-serving candidate target network node is a non-serving candidate target cell and (ii) the current serving network node is a current serving cell.

64. An apparatus, the apparatus comprising: means for obtaining first uplink transmission data indicative of a first uplink transmission for transmission via a user equipment to a non-serving candidate target network node; means for obtaining second uplink transmission data indicative of a second uplink transmission for transmission via the user equipment to a current serving network node; means for determining, based at least in part on the first uplink transmission data and the second uplink transmission data, a transmission collision between the first uplink transmission and the second uplink transmission; and a component for performing a responsive action corresponding to the first uplink transmission and the second uplink transmission based at least in part on the transmission conflict.

65. The apparatus of claim 64, wherein determining the transmission collision between the first uplink transmission and the second uplink transmission comprises: at least one of the following: identifying a threshold number of symbol overlaps between the first uplink transmission and the second uplink transmission based at least in part on the first uplink transmission data and the second uplink transmission data; or identifying a threshold time gap between the first uplink transmission and the second uplink transmission based at least in part on the first uplink transmission data and the second uplink transmission data.

66. The apparatus of claim 65, wherein: the second uplink transmission comprises at least one of: a physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH) transmission carrying a hybrid automatic repeat request acknowledgement (HARQ-ACK); a PUSCH or PUCCH transmission carrying a positive scheduling request (SR), a positive rank indicator (RI), a positive channel state information reference signal (CSI-RS) resource indicator (CRI), or a positive synchronization signal block rank indicator (SSBRI); or a physical random access channel (PRACH) transmission; and the component for performing the responsive action comprises: a component for dropping the first uplink transmission to the non-serving candidate target network node; and a component for providing the second uplink transmission to the current serving network node.

67. The apparatus of claim 65 or 66, wherein: the second uplink transmission comprises at least one of: a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI; or a PRACH transmission; and the component for performing the responsive action comprises: a component for dropping the second uplink transmission to the current serving network node; and a component for providing the first uplink transmission to the non-serving candidate target network node.

68. The apparatus of claim 65 or 66, wherein: the second uplink transmission comprises at least one of: a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI; or a PUSCH or PUCCH transmission carrying a HARQ-ACK; and the component for performing the responsive action comprises: a component for dropping the second uplink transmission to the current serving network node; and a component for providing the first uplink transmission to the non-serving candidate target network node.

69. The apparatus of claim 65, 66, 67, or 68, wherein: the second uplink transmission comprises a PUSCH or PUCCH transmission carrying a positive SR, a positive RI, a positive CRI, or a positive SSBRI; and the component for performing the responsive action comprises: a component for dropping the second uplink transmission to the current serving network node; and means for providing the first uplink transmission to the non-serving candidate target network node.

70. The apparatus of claim 65, wherein: the second uplink transmission comprises at least one of: a PUSCH transmission carrying aperiodic CSI; a PUCCH or PUSCH transmission carrying at least one of periodic channel state information (CSI) or semi-CSI, wherein the at least one of the periodic CSI or the semi-persistent CSI comprises at least one of: a channel quality indicator (CQI), a precoding matrix indicator (PMI), a layer 1 reference signal received power (Ll-RSRP), or a layer 1 signal to interference plus noise ratio (Ll-SINR); or a sounding reference signal (SRS) transmission; and the means for performing the responsive action comprises: means for dropping the second uplink transmission to the current serving network node; and means for providing the first uplink transmission to the non-serving candidate target network node.

71. The apparatus of claim 65 or 70, wherein: the second uplink transmission comprises a PUSCH transmission carrying aperiodic CSI; and the means for performing the responsive action comprises: means for dropping the first uplink transmission to the non-serving candidate target network node; and means for providing the second uplink transmission to the current serving network node.

72. The apparatus of claim 65, wherein: the second uplink transmission comprises at least one of a PUCCH transmission or a PUSCH transmission; the apparatus further comprises means for determining at least one of: (i) a priority index of the second uplink transmission exceeds a priority index of the first uplink transmission, or (ii) the priority index of the second uplink transmission exceeds a predetermined threshold; and the means for performing the responsive action comprises, in response to the determining: means for dropping the first uplink transmission to the non-serving candidate target network node; and means for providing the second uplink transmission to the current serving network node.

73. The apparatus of claim 65, wherein the apparatus further comprises: means for determining that the user equipment is provided with an active or indicated transmission configuration indicator (TCI) state for the non-serving candidate target network node, wherein the means for performing the responsive action comprises, in response to the determining: means for dropping the second uplink transmission to the current serving network node; and means for providing the first uplink transmission to the non-serving candidate target network node.

74. The apparatus of claim 65, wherein the apparatus further comprises: means for determining an existence of downlink timing synchronization between the non-serving candidate target network node and the user equipment, wherein the means for performing the responsive action comprises, in response to the determining: means for dropping the second uplink transmission to the current serving network node; and means for providing the first uplink transmission to the non-serving candidate target network node.

75. The apparatus of claims 64 to 74, wherein the first uplink transmission for transmission to the non-serving candidate target network node comprises: a PRACH transmission or a sounding reference signal (SRS) transmission.

76. The apparatus of claim 65, wherein: the first uplink transmission comprises a PRACH transmission triggered by a physical downlink control channel (PDCCH) order; the apparatus further comprises means for determining that the PDCCH order indicates at least one of: a retransmission, an initial transmission, or a new transmission; and the means for performing the response action comprises, in response to the determination: means for dropping the second uplink transmission to the current serving network node; and means for providing the first uplink transmission to the non-serving candidate target network node.

77. The apparatus of claim 65, wherein: the first uplink transmission comprises a first physical random access channel (PRACH) transmission or a sounding reference signal (SRS) transmission; the second uplink transmission comprises a second PRACH transmission; and the apparatus further comprises: means for determining that at least one primary cell of the current serving network node is experiencing beam failure recovery; and in response to the determination, and in performance of the response action, the means for performing the response action comprises: means for dropping the first uplink transmission to the non-serving candidate target network node; and means for providing the second uplink transmission to the current serving network node.

78. The apparatus of claim 65, wherein: the first uplink transmission comprises a first PRACH transmission or a sounding reference signal (SRS) transmission; the second uplink transmission comprises a second PRACH transmission; and the apparatus further comprises: means for determining that (i) at least one secondary cell of the current serving network node is experiencing beam failure recovery, and (ii) a primary cell of the current serving network node is not experiencing beam failure recovery; and in response to the determination, and in performance of the response action, the means for performing the response action comprises: means for dropping the second uplink transmission to the current serving network node; and means for providing the first uplink transmission to the non-serving candidate target network node.

79. The apparatus of claim 65, wherein: the first uplink transmission comprises a first PRACH transmission or a sounding reference signal (SRS) transmission; the second uplink transmission comprises a second PRACH transmission; and the apparatus further comprises: means for determining that the user equipment has triggered a maximum permissible exposure (MPE) report; and in response to the determination, and in performance of the response action, the means for performing the response action comprises: means for discarding the first uplink transmission to the non-serving candidate target network node; and means for providing the second uplink transmission to the current serving network node.

80. The apparatus of claim 65, wherein: the first uplink transmission comprises: a first PRACH transmission or a sounding reference signal (SRS) transmission; the second uplink transmission comprises: a second PRACH transmission; and the apparatus further comprises: means for determining that the second PRACH transmission comprises a contention based random access (CBRA) based beam failure recovery, or a contention free random access (CFRA) transmission; and in response to the determination, and in performance of the responsive action, the means for performing the responsive action comprises: means for discarding the first uplink transmission to the non-serving candidate target network node; and means for providing the second uplink transmission to the current serving network node.

81. The apparatus of claim 65, wherein: the first uplink transmission comprises: a first PRACH transmission or a sounding reference signal (SRS) transmission; the second uplink transmission comprises: a second PRACH transmission; and the apparatus further comprises: means for determining that: (i) the current serving network node is experiencing a beam failure recovery for at least one transmission / response point (TRP), and (ii) the current serving network node comprises at least one additional TRP having an available link; and in response to the determination, and in performance of the responsive action: means for discarding the second uplink transmission to the current serving network node; and means for providing the first uplink transmission to the non-serving candidate target network node.

82. The apparatus of claim 65, wherein the apparatus further comprises: means for determining, based at least in part on the second uplink transmission data, a power headroom report (PHR) reporting type associated with the second uplink transmission, wherein the PHR reporting type associated with the second uplink transmission is aperiodic; and in response to the determination, and in performance of the responsive action, the means for performing the responsive action comprises: means for discarding the first uplink transmission to the non-serving candidate target network node; and means for providing the second uplink transmission to the current serving network node.

83. The apparatus of claim 65, wherein the apparatus further comprises: means for determining, based at least in part on the second uplink transmission data, that the second uplink transmission comprises a hybrid automatic repeat request acknowledgement (HARQ-ACK) retransmission; and in response to the determination, and in performance of the responsive action, the means for performing the responsive action comprises: means for discarding the first uplink transmission to the non-serving candidate target network node; and A means for providing the second uplink transmission to the current serving network node.

84. The apparatus of claims 64-83, wherein (i) the non-serving candidate target network node is a non-serving candidate target cell, and (ii) the current serving network node is a current serving cell.

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