Signaling Aspects of the Conditional Primary Secondary Cell Change Procedure in Multi-Radio Access Technology Dual Connectivity

Abstract

Generally speaking, various aspects of the present disclosure relate to wireless communication. In some aspects, a master node (MN) may receive a message indicating that a user equipment (UE) has determined that conditions for a conditional primary secondary cell (PSCell) change have been met for a candidate target PSCell. The candidate target PSCell may be one of a set of candidate target PSCs associated with the UE in a conditional PSCell change configuration provided by a base station. The MN may send an acknowledgment message associated with the conditional PSCell change to a source secondary node. Numerous other aspects are provided.

Description

[0001] Cross - Reference to Related Applications

[0002] This patent application claims priority to the following applications: U.S. Provisional Patent Application No. 63 / 022,081, filed on May 8, 2020, entitled "SIGNALING ASPECTS OF A CONDITIONAL PRIMARY SECONDARY CELL CHANGE PROCEDURE IN MULTI - RADIO ACCESS TECHNOLOGY DUAL CONNECTIVITY"; and U.S. Non - Provisional Patent Application No. 17 / 224,785, filed on April 7, 2021, entitled "SIGNALING ASPECTS OF A CONDITIONAL PRIMARY SECONDARY CELL CHANGE PROCEDURE IN MULTI - RADIO ACCESS TECHNOLOGY DUAL CONNECTIVITY", which are hereby incorporated herein by reference in their entirety. Field of the Invention

[0003] Broadly speaking, aspects of the present disclosure relate to wireless communication and to techniques and apparatus for signaling aspects of a conditional primary secondary cell (PSCell) change procedure in multi - radio access technology (multi - RAT) dual connectivity (DC). Background Art

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. A typical wireless communication system may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single - carrier frequency division multiple access (SC - FDMA) systems, time - division synchronous code division multiple access (TD - SCDMA) systems, and Long Term Evolution (LTE). LTE / Advanced LTE is an enhanced set of the Universal Mobile Telecommunications System (UMTS) mobile standards released by the Third Generation Partnership Project (3GPP).

[0005] A wireless network may include multiple base stations (BSs) capable of supporting communication for multiple user equipments (UEs). The UEs may communicate with the BSs via a downlink and an uplink. The "downlink" (or "forward link") refers to the communication link from the BS to the UE, while the "uplink" (or "reverse link") refers to the communication link from the UE to the BS. As will be described in more detail herein, the BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit receive point (TRP), New Radio (NR) BS, 5G Node B, etc.

[0006] The above multi-access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipments to communicate at the urban, national, regional, and even global levels. NR (which may also be referred to as 5G) is an enhanced set of the LTE mobile standard released by 3GPP. NR is designed to better support mobile broadband Internet access and support beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation by improving spectral efficiency, reducing costs, improving services, utilizing new spectrums, and using orthogonal frequency division multiplexing with cyclic prefix (CP) (CP-OFDM) on the downlink (DL) and CP-OFDM and / or SC-FDM (e.g., also referred to as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL) to better integrate with other open standards. As the demand for mobile broadband access continues to grow, it is still useful to further improve LTE, NR, and other radio access technologies. SUMMARY

[0007] In some aspects, a method of wireless communication performed by a master node (MN) may include: receiving a message indicating that a UE has determined that a condition for a conditional primary-secondary cell (PSCell) change has been met for a candidate target PSCell, the candidate target PSCell being one of a set of candidate target PSCs associated with the UE in a conditional PSCell change configuration; and sending an acknowledgment message associated with the conditional PSCell change to a source secondary node (SN).

[0008] In some aspects, a method of wireless communication performed by an MN may include: receiving, from a source SN, a message indicating one or more MN terminated split bearers that were not accepted by a target SN during SN addition associated with a conditional PSCell change; and sending a modified master cell group (MCG) configuration to the source SN, with the indicated one or more MN terminated split bearers excluded from the modified MCG configuration.

[0009] In some aspects, a method of wireless communication performed by a source SN may include: receiving, from an MN, an acknowledgement message indicating that a UE has determined that a candidate target PSCell has met the conditions for a conditional PSCell change; and forwarding data associated with the UE to the MN or to a target SN associated with the candidate target PSCell, at least in part based on the acknowledgement message.

[0010] In some aspects, a method of wireless communication performed by a target SN may include: receiving a request to release reserved resources for a candidate target PSCell associated with the target SN, the candidate target PSCell being one of a set of candidate target PSCs associated with a conditional PSCell change associated with a user equipment; and releasing the reserved resources for the candidate target PSCell, at least in part based on the request.

[0011] In some aspects, a method of wireless communication performed by a target SN may include: receiving a message indicating that a UE has determined that conditions for a conditional PSCell change have been met for a candidate target PSCell; and sending an acknowledgement message associated with the conditional PSCell change to the source SN, the acknowledgement message including a candidate target PSCell identifier of the candidate target PSCell.

[0012] In some aspects, a method of wireless communication performed by a UE may include: detecting a radio link failure on a MCG during a random access channel (RACH) procedure performed on a target PSCell, the UE having determined that conditions for a conditional PSCell change have been met for the target PSCell; and performing a MCG failure information procedure after completion of the RACH procedure, at least in part based on detecting the radio link failure on the MCG during the RACH procedure.

[0013] In some aspects, a mobility node (MN) for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to: receive a message indicating that a UE has determined that conditions for a conditional PSCell change have been met for a candidate target PSCell, the candidate target PSCell being one of a set of candidate target PSCs associated with the UE in a conditional PSCell change configuration; and send an acknowledgement message associated with the conditional PSCell change to the source SN.

[0014] In some aspects, a MN for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to: receive a message from a source SN, the message indicating one or more MN terminated split bearers that were not accepted by a target SN during SN addition associated with a conditional PSCell change; and send a modified MCG configuration to the source SN, the indicated one or more MN terminated split bearers being excluded from the modified MCG configuration.

[0015] In some aspects, a source SN for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to: receive an acknowledgement message from a MN, the acknowledgement message indicating that the UE has determined that a candidate target PSCell has met the conditions for a conditional PSCell change; and forward data associated with the UE to the MN or to a target SN associated with the candidate target PSCell, at least in part based on the acknowledgement message.

[0016] In some aspects, a target SN for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to: receive a request to release reserved resources for a candidate target PSCell associated with the target SN, the candidate target PSCell being one of a set of candidate target PSCells associated with a conditional PSCell change associated with a user equipment; and release the reserved resources for the candidate target PSCell, at least in part based on the request.

[0017] In some aspects, a target SN for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to: receive a message indicating that the UE has determined that the conditions for a conditional PSCell change have been met for a candidate target PSCell; and send an acknowledgement message associated with the conditional PSCell change to the source SN, the acknowledgement message including a candidate target PSCell identifier for the candidate target PSCell.

[0018] In some aspects, a UE for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to: during a RACH procedure on a target PSCell, detect a radio link failure on the MCG, the UE having determined that conditions for a conditional PSCell change have been met for the target PSCell; and perform an MCG failure information procedure after completion of the RACH procedure, at least in part based on the detected radio link failure on the MCG during the execution of the RACH procedure.

[0019] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of an MN, may cause the one or more processors to: receive a message indicating that the UE has determined that conditions for a conditional PSCell change have been met for a candidate target PSCell, the candidate target PSCell being one of a set of candidate target PSCs associated with the UE in a conditional PSCell change configuration; and send an acknowledgment message associated with the conditional PSCell change to a source SN.

[0020] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of an MN, may cause the one or more processors to: receive from a source SN a message indicating one or more MN terminated split bearers that were not accepted by a target SN during SN addition associated with a conditional PSCell change for the target SN; and send a modified MCG configuration to the source SN, the indicated one or more MN terminated split bearers being excluded from the modified MCG configuration.

[0021] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a source SN, may cause the one or more processors to: receive from an MN an acknowledgment message indicating that the UE has determined that a candidate target PSCell has met the conditions for a conditional PSCell change; and forward data associated with the UE to the MN or to a target SN associated with the candidate target PSCell, at least in part based on the acknowledgment message.

[0022] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When executed by one or more processors of a target SN, the one or more instructions may cause the one or more processors to: receive a request to release reserved resources for a candidate target PSCell associated with the target SN, the candidate target PSCell being one of a set of candidate target PSCells associated with a conditional PSCell change associated with a user equipment; and release the reserved resources for the candidate target PSCell at least in part based on the request.

[0023] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When executed by one or more processors of a target SN, the one or more instructions may cause the one or more processors to: receive a message indicating that the UE has determined that a condition for a conditional PSCell change has been met for a candidate target PSCell; and send an acknowledgment message associated with the conditional PSCell change to a source SN, the acknowledgment message including a candidate target PSCell identifier of the candidate target PSCell.

[0024] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When executed by one or more processors of a UE, the one or more instructions may cause the one or more processors to: detect a radio link failure on the MCG during a RACH procedure on a target PSCell, the UE having determined that a condition for a conditional PSCell change has been met for the target PSCell; and perform an MCG failure information procedure after completion of the RACH procedure at least in part based on the detected radio link failure on the MCG during the RACH procedure.

[0025] In some aspects, an apparatus for wireless communication may include: a unit for receiving a message indicating that the UE has determined that a condition for a conditional PSCell change has been met for a candidate target PSCell, the candidate target PSCell being one of a set of candidate target PSCells associated with the UE in a conditional PSCell change configuration; and a unit for sending an acknowledgment message associated with the conditional PSCell change to a source SN.

[0026] In some aspects, an apparatus for wireless communication may include: a unit for receiving a message from a source SN, the message indicating one or more MN terminated split bearers that were not accepted by a target SN during SN addition associated with a conditional PSCell change; and a unit for sending a modified MCG configuration to the source SN, the indicated one or more MN terminated split bearers being excluded from the modified MCG configuration.

[0027] In some aspects, an apparatus for wireless communication may include: a unit for receiving an acknowledgement message from an MN, the acknowledgement message indicating that the UE has determined that a candidate target PSCell has met the conditions for a conditional PSCell change; and a unit for forwarding data associated with the UE to the MN or to a target SN associated with the candidate target PSCell, at least in part based on the acknowledgement message.

[0028] In some aspects, an apparatus for wireless communication may include: a unit for receiving a request to release reserved resources for a candidate target PSCell associated with the apparatus, the candidate target PSCell being one of a set of candidate target PSCells associated with a conditional PSCell change associated with a user equipment; and a unit for releasing the reserved resources for the candidate target PSCell, at least in part based on the request.

[0029] In some aspects, an apparatus for wireless communication may include: a unit for receiving a message indicating that the UE has determined that the conditions for a conditional PSCell change have been met for a candidate target PSCell; and a unit for sending an acknowledgement message associated with the conditional PSCell change to the source SN, the acknowledgement message including a candidate target PSCell identifier for the candidate target PSCell.

[0030] In some aspects, an apparatus for wireless communication may include: a unit for detecting a radio link failure on an MCG during a RACH procedure on a target PSCell, the apparatus having determined that the conditions for a conditional PSCell change have been met for the target PSCell; and a unit for performing an MCG failure information procedure after completion of the RACH procedure, at least in part based on detecting the radio link failure on the MCG during the RACH procedure.

[0031] Broadly, aspects include methods, apparatuses, systems, computer program products, non-transitory computer readable media, user equipment, base stations, wireless communication devices, and / or processing systems as fully described herein with reference to the figures and the specification and as illustrated by the figures and the specification.

[0032] The foregoing has outlined rather broadly the features and technical advantages of examples in accordance with the present disclosure so that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The concepts and specific examples disclosed may readily be utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. When considered in conjunction with the accompanying drawings, the characteristics of the concepts disclosed herein (both their organization and method of operation) as well as the associated advantages will be better understood in light of the following description. Each of the drawings in the figures is provided for purposes of illustration and description and is not to be construed as a definition of the limits of the claims.

[0033] Although aspects are described herein by way of illustration of some examples, those skilled in the art will understand that such aspects can be implemented in many different arrangements and scenarios. Different platform types, devices, systems, shapes, sizes, and / or packaging arrangements can be used to implement the technologies described herein. For example, some aspects can be implemented via integrated chip embodiments and other non-module component-based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial devices, retail / purchase devices, medical devices, or artificial intelligence-enabled devices). Aspects can be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, or system-level components. Devices incorporating the described aspects and features can include additional components and features for the implementation and execution of the claimed and described aspects. For example, the transmission and reception of wireless signals can include multiple components for analog and digital purposes (e.g., hardware components including antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders, or summers). The aspects described herein are intended to be implementable in a variety of devices, components, systems, distributed arrangements, or end-user devices having different sizes, shapes, and configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] To obtain a more specific description of the inventive concepts briefly outlined above, reference is made to the aspects, some of which are illustrated in the accompanying drawings. It should be noted, however, that the drawings only illustrate certain typical aspects of the present disclosure and are not to be considered as limiting the scope of the present disclosure, as the description may admit other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0035] Figure 1 is a diagram illustrating an example of a wireless network in accordance with the present disclosure.

[0036] Figure 2is a diagram showing an example of communication between a base station and a UE in a wireless network according to the present disclosure.

[0037] Figure 3A and Figure 3B is a diagram showing an example of SN-initiated conditional PSCell change according to the present disclosure.

[0038] Figure 4A and Figure 4B is a diagram showing an example of MN-initiated conditional PSCell change according to the present disclosure.

[0039] Figure 5A and Figure 5B is a diagram showing an example of SN-initiated and SN-executed conditional PSCell change according to the present disclosure.

[0040] Figure 6 is a diagram showing an example of MN-initiated conditional PSCell change within an SN according to the present disclosure.

[0041] Figure 7 is a diagram showing an example of SN-initiated conditional PSCell change within an SN with MN participation according to the present disclosure.

[0042] Figure 8 is a diagram showing an example of SN-initiated conditional PSCell change within an SN without MN participation according to the present disclosure.

[0043] Figure 9 is a diagram showing an example process, such as one executed by a master node, according to the present disclosure.

[0044] Figure 10 is a diagram showing an example process, such as one executed by a master node, according to the present disclosure.

[0045] Figure 11 is a diagram showing an example process, such as one executed by a source secondary node, according to the present disclosure.

[0046] Figure 12 is a diagram showing an example process, such as one executed by a target secondary node, according to the present disclosure.

[0047] Figure 13 is a diagram showing an example process, such as one executed by a target secondary node, according to the present disclosure.

[0048] Figure 14 is a diagram showing an example process, such as one executed by a UE, according to the present disclosure. Detailed Description

[0049] Aspects of the present disclosure are more fully described below with reference to the accompanying drawings. However, the present disclosure may be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art should appreciate that the scope of the present disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of any other aspect of the present disclosure or in combination with any other aspect of the present disclosure. For example, a device may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the present disclosure is intended to cover such devices or methods implemented using other structures, functionality, or a combination of structures and functionality in addition to or different from the aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.

[0050] Certain aspects of a telecommunications system will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"), and illustrated in the accompanying drawings. These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

[0051] It should be noted that although terms commonly associated with 5G or NR radio access technology (RAT) may be used herein to describe aspects, aspects of the present disclosure may be applied to other RATs such as 3G RAT, 4G RAT, and / or post-5G (e.g., 6G) RAT.

[0052] Figure 1FIG. is a diagram illustrating an example of a wireless network 100 in accordance with the present disclosure. The wireless network 100 may be or may include a 5G (NR) network and / or an LTE network and elements of other examples. The wireless network 100 may include a plurality of base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with a user equipment (UE) and may also be referred to as an NR BS, a Node B, a gNB, a 5G Node B (NB), an access point, a transmission reception point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to the coverage area of a BS and / or the BS subsystem serving that coverage area, depending on the context in which the term is used.

[0053] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., with a radius of several kilometers) and may allow unrestricted access by UEs with a service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with a service subscription. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In the Figure 1 example shown, BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "Node B", "5G NB", and "cell" may be used interchangeably herein.

[0054] In some aspects, a cell may not necessarily be stationary, and the geographic area of a cell may move according to the location of a mobile BS. In some aspects, BSs may be interconnected with each other and / or with one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces (such as direct physical connections or virtual networks) using any suitable transmission network.

[0055] The wireless network 100 may also include relay stations. A relay station is an entity that can receive a data transmission from an upstream station (e.g., a BS or a UE) and send the data transmission to a downstream station (e.g., a UE or a BS). A relay station may also be a UE capable of relaying transmissions for other UEs. In Figure 1 In the example shown in Figure 1 , the relay BS 110d may communicate with the macro BS 110a and the UE 120d to facilitate communication between the BS 110a and the UE 120d. The relay BS may also be referred to as a relay station, a relay base station, a repeater, etc.

[0056] The wireless network 100 may be a heterogeneous network including different types of BSs (such as macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 watts).

[0057] The network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other via a wireless or wired backhaul (e.g., directly or indirectly).

[0058] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, a terminal, a mobile station, a user unit, a station, etc. A UE may be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet device, a camera, a gaming device, a netbook, a smartbook, a superbook, a medical device or apparatus, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio unit), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0059] Some UEs may be considered machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags, which may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide a connection to or from a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link, for example. Some UEs may be considered Internet of Things (IoT) devices, and / or may be implemented as narrowband IoT (NB-IoT) devices. Some UEs may be considered customer premise equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120, such as a processor component and / or a memory component. In some aspects, the processor component and the memory component may be coupled together. For example, the processor component (e.g., one or more processors) and the memory component (e.g., a memory) may be operatively coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0060] Generally, any number of wireless networks may be deployed in a given geographical area. Each wireless network may support a specific RAT and may operate on one or more frequencies. The RAT may also be referred to as a radio technology, an air interface, etc. The frequency may also be referred to as a carrier, a channel, etc. Each frequency may support a single RAT in a given geographical area to avoid interference between wireless networks of different RATs. In some cases, an NR or 5G RAT network may be deployed.

[0061] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using the base station 110 as an intermediary for communicating with each other). For example, UEs 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols or vehicle-to-infrastructure (V2I) protocols), and / or mesh networks. In such cases, UEs 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by the base station 110.

[0062] Devices of the wireless network 100 can communicate using the electromagnetic spectrum, which can be subdivided into various categories, bands, channels, etc. based on frequency or wavelength. For example, devices of the wireless network 100 can communicate using an operating band having a first frequency range (FR1) that can span from 410 MHz to 7.125 GHz, and / or can communicate using an operating band having a second frequency range (FR2) that can span from 24.25 GHz to 52.6 GHz. The frequency between FR1 and FR2 is sometimes referred to as the band center frequency. Although a portion of FR1 is greater than 6 GHz, FR1 is generally referred to as the "sub-6 GHz" band. Similarly, FR2 is generally referred to as the "millimeter wave" band, although FR2 is different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) identified as the "millimeter wave" band by the International Telecommunication Union (ITU). Thus, unless otherwise explicitly stated, it should be understood that the term "sub-6 GHz" etc. (if used herein) can broadly represent frequencies less than 6 GHz, frequencies within FR1, and / or the band center frequency (e.g., greater than 7.125 GHz). Similarly, unless otherwise explicitly stated, it should be understood that the term "millimeter wave" etc. (if used herein) can broadly represent frequencies within the EHF band, frequencies within FR2, and / or the band center frequency (e.g., less than 24.25 GHz). It is expected that the frequencies included in FR1 and FR2 can be modified, and the techniques described herein apply to those modified frequency ranges.

[0063] As noted above, Figure 1 is provided as an example. Other examples may be different from those Figure 1 described with respect to

[0064] Figure 2 FIG. 200 is a diagram illustrating an example 200 of a base station 110 communicating with a UE 120 in a wireless network 100 according to the present disclosure. The base station 110 can be equipped with T antennas 234a through 234t, and the UE 120 can be equipped with R antennas 252a through 252r, where generally, T≥1 and R≥1.

[0065] At base station 110, transmit processor 220 may receive data for one or more UEs from data source 212, select one or more modulation and coding schemes (MCSs) for the UE at least in part based on channel quality indicators (CQIs) received from each UE, process (e.g., encode and modulate) the data for the UE at least in part based on the MCSs selected for each UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper layer signaling), and provide overhead symbols and control symbols. Transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRSs) or demodulation reference signals (DMRSs)) and synchronization signals (e.g., primary synchronization signals (PSSs) or secondary synchronization signals (SSSs)). Transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, control symbols, overhead symbols, and / or reference symbols (if applicable), and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process the corresponding output symbol stream (e.g., for OFDM) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.

[0066] At the UE 120, antennas 252a through 252r may receive downlink signals from the base station 110 and / or other base stations, and may provide the received signals to demodulators (DEMOD) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, down-convert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM) to obtain received symbols. The MIMO detector 256 may obtain the received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols (if applicable), and provide the detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide the decoded data for the UE 120 to the data sink 260, and provide the decoded control information and system information to the controller / processor 280. The term "controller / processor" may refer to one or more controllers, one or more processors, or a combination thereof. The channel processor may determine reference signal received power (RSRP) parameters, received signal strength indicator (RSSI) parameters, reference signal received quality (RSRQ) parameters, and / or channel quality indicator (CQI) parameters, among other examples. In some aspects, one or more components of the UE 120 may be included in a housing 284.

[0067] The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292. The network controller 130 may include, for example, one or more devices in a core network. The network controller 130 may communicate with the base station 110 via the communication unit 294.

[0068] Antennas (e.g., antennas 234a through 234t and / or antennas 252a through 252r) may include or may be included within one or more antenna panels, antenna groups, collections of antenna elements, and / or antenna arrays, among other examples. An antenna panel, antenna group, collection of antenna elements, and / or antenna array may include one or more antenna elements. An antenna panel, antenna group, collection of antenna elements, and / or antenna array may include a coplanar collection of antenna elements and / or a non-coplanar collection of antenna elements. An antenna panel, antenna group, collection of antenna elements, and / or antenna array may include antenna elements within a single housing and / or antenna elements within multiple housings. An antenna panel, antenna group, collection of antenna elements, and / or antenna array may include one or more antenna elements coupled to one or more transmit and / or receive components such as Figure 2 one or more components of

[0069] On the uplink, at the UE 120, the transmit processor 264 may receive and process data from the data source 262 and control information from the controller / processor 280 (e.g., for reporting including RSRP, RSSI, RSRQ, and / or CQI). The transmit processor 264 may also generate reference symbols for one or more reference signals. Symbols from the transmit processor 264 may be precoded by the TX MIMO processor 266 (if applicable), further processed by the modulators 254a to 254r (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to the base station 110. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 254) of the UE 120 may be included in the modem of the UE 120. The transceiver may include any combination of the antenna 252, modulator and / or demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, and / or TX MIMO processor 266. The transceiver may be used by a processor (e.g., the controller / processor 280) and the memory 282 to perform aspects of any of the methods described herein (e.g., as referred to Figure 3A , Figure 3B , Figure 4A , Figure 4B , Figure 5A , Figure 5B and Figures 6 - 14 described).

[0070] At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain the decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The base station 110 may include a scheduler 246 to schedule the UE 120 for downlink and / or uplink communication. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 232) of the base station 110 may be included in the modem of the base station 110. In some aspects, the base station 110 includes a transceiver. The transceiver may include any combination of the antenna 234, modulator and / or demodulator 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., the controller / processor 240) and the memory 242 to perform aspects of any of the methods described herein (e.g., as referred toFigure 3A , Figure 3B , Figure 4A , Figure 4B , Figure 5A , Figure 5B and Figures 6 - 14 as described).

[0071] The controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 any other component in may perform one or more techniques associated with the signaling aspects of the conditional PSCell change procedure in multi-RAT DC (MR-DC), as described in more detail elsewhere herein. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 any other component in may perform or direct, for example Figure 9 procedure 900 of Figure 10 procedure 1000 of Figure 11 procedure 1100 of Figure 12 procedure 1200 of Figure 13 procedure 1300 of Figure 14 procedure 1400 of and / or the operations of other procedures as described herein. Memories 242 and 282 may store data and program code for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, when one or more instructions are executed (e.g., directly, or after compilation, conversion, and / or interpretation) by one or more processors of base station 110 and / or UE 120, the one or more processors, UE 120, and / or base station 110 may be caused to perform or direct, for example Figure 9 procedure 900 of Figure 10 procedure 1000 of Figure 11 procedure 1100 of Figure 12 procedure 1200 of Figure 13 procedure 1300 of Figure 14 procedure 1400 of and / or the operations of other procedures as described herein. In some aspects, executing the instructions may include running the instructions, converting the instructions, and / or compiling the instructions, interpreting the instructions.

[0072] In some aspects, the base station 110 may include: a unit for receiving a message indicating that the UE 120 has determined that a candidate target PSCell has met the conditions for a conditional PSCell change, where the candidate target PSCell is one of the candidate target PSCell set associated with the UE in the conditional PSCell change configuration; a unit for sending an acknowledgment message associated with the conditional PSCell change to the source SN, etc. In some aspects, such units may include one or more components of the base station 110 described in conjunction with Figure 2 such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.

[0073] In some aspects, the base station 110 may include: a unit for receiving a message from the source SN indicating one or more MN terminated split bearers that were not accepted by the target SN during SN addition associated with a conditional PSCell change; a unit for sending a modified MCG configuration to the source SN, with the indicated one or more MN terminated split bearers excluded from the modified MCG configuration; etc. In some aspects, such units may include one or more components of the base station 110 described in conjunction with Figure 2 such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.

[0074] In some aspects, the base station 110 may include: a unit for receiving an acknowledgment message from the MN indicating that the UE 120 has determined that the candidate target PSCell has met the conditions for a conditional PSCell change; a unit for forwarding data associated with the UE to the MN or to the target SN associated with the candidate target PSCell at least partially based on the acknowledgment message; etc. In some aspects, such units may include one or more components of the base station 110 described in conjunction with Figure 2 such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.

[0075] In some aspects, the base station 110 may include: a unit for receiving a request to release reserved resources for a candidate target PSCell associated with a target SN, where the candidate target PSCell is one of a set of candidate target PSCs associated with a conditional PSCell change associated with a user equipment; a unit for releasing the reserved resources of the candidate target PSCell at least in part based on the request; etc. In some aspects, such a unit may include one or more components of the base station 110 described in conjunction with Figure 2 such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.

[0076] In some aspects, the base station 110 may include: a unit for receiving a message indicating that the UE 120 has determined that a condition for a conditional PSCell change has been met for a candidate target PSCell; a unit for sending an acknowledgment message associated with the conditional PSCell change to the source SN, where the acknowledgment message includes a candidate target PSCell identifier of the candidate target PSCell; etc. In some aspects, such a unit may include one or more components of the base station 110 described in conjunction with Figure 2 such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.

[0077] In some aspects, the UE 120 may include: a unit for detecting a radio link failure on the MCG during a RACH procedure on a target PSCell, where the UE has determined that a condition for a conditional PSCell change has been met for the target PSCell; a unit for performing an MCG failure information procedure after completion of the RACH procedure at least in part based on detecting the radio link failure on the MCG during the RACH procedure; etc. In some aspects, such a unit may include one or more components of the UE 120 described in conjunction with Figure 2 such as controller / processor 280, transmit processor 264, TXMIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, etc.

[0078] Although Figure 2The boxes in [description] are shown as separate components, but the functions described above with respect to these boxes can be implemented in a single hardware, software, or combined component, or in various combinations of components. For example, the functions described with respect to the transmit processor 264, the receive processor 258, and / or the TX MIMO processor 266 can be performed by, or under the control of, the controller / processor 280.

[0079] As noted above, Figure 2 is provided as an example. Other examples may be different from the example described with respect to Figure 2 as described.

[0080] In a wireless communication system, dual connectivity (DC) is designed to utilize radio resources within multiple carriers. DC can be used to increase throughput, provide mobility robustness, support load balancing between network nodes, etc. The operating DC mode is a mode in which a UE (e.g., UE 120) is configured to utilize radio resources of two different schedulers located in two network nodes (e.g., two base stations 110). These network nodes are referred to as the master node (MN) and the secondary node (SN). Thus, DC enables the UE to simultaneously transmit and receive data from a cell group on multiple component carriers via the MN and the SN. In the context of DC, the master cell group (MCG) is the serving cell group associated with the MN and includes the primary cell (Pcell) and optionally one or more secondary cells (Scell). In addition, the secondary cell group (SCG) is the serving cell group associated with the SN and includes the primary secondary cell (PScell) and optionally one or more Scell.

[0081] A specific example of DC is the evolved UMTS terrestrial radio access network (E-UTRAN) NR–DC (which is referred to as EN-DC). EN-DC allows a UE to connect to an LTE base station (e.g., which acts as the MN) and an NR base station (e.g., which acts as the SN). The EN-DC enabled UE registers with the LTE core network (i.e., the LTE evolved packet core (EPC)) and reports measurements of the NR frequencies. If the signal quality for the UE supports NR services, the LTE base station communicates with the NR base station for bearer assignment resources. Then, the NR resource assignment is signaled to the UE via an LTE radio resource control (RRC) connection reconfiguration message. Once the RRC connection reconfiguration process is complete, the UE is simultaneously connected to the LTE and NR networks. In EN-DC, the RRC process is used to perform secondary cell group addition. For example, the RRC connection reconfiguration process can be used to add, modify, or release a secondary cell group based on NR measurements performed by the UE. The implementation of DC using multiple radio access technologies (RAT), such as EN-DC, can be referred to as multi-RAT DC (MR-DC).

[0082] In MR-DC operation, a conditional PSCell addition procedure may be performed to add a candidate target PSCell for a target SN in association with serving the UE. Here, the conditional PSCell addition is performed based on the UE detecting that the conditions for conditional PSCell addition have been met for the target candidate PSCell. Similarly, in MR-DC operation, a conditional PSCell change procedure may be performed to change the PSCell serving the UE from a source PSCell to a candidate target PSCell. Here, the candidate target PSCell may be associated with the source SN (i.e., the conditional PSCell change may be within the SN) or may be associated with the target SN (i.e., the conditional PSCell change may be between SNs). Here, the conditional PSCell change is performed based on the UE detecting that the conditions for conditional PSCell change have been met for the target candidate PSCell. The conditional PSCell addition or the conditional PSCell change may be initiated by the MN or may be initiated by the SN. However, some signaling aspects of the conditional PSCell change procedure (e.g., in MR-DC) need to be defined to ensure the reliable performance of the conditional PSCell change.

[0083] Some aspects described herein provide techniques and apparatuses for signaling aspects of the conditional PSCell change procedure in MR-DC. The signaling aspects of the conditional PSCell change procedure in MR-DC are described below in the context of various types of conditional PSCell change procedures.

[0084] Figure 3A ,, Figure 3B ,, Figure 4A ,, Figure 4B ,, Figure 5A ,, Figure 5B ,, Figure 6 ,, Figure 7 and Figure 8 are diagrams showing examples associated with signaling aspects of the conditional PSCell change procedure in MR-DC according to the present disclosure. In Figure 3A ,, Figure 3B ,, Figure 4A ,, Figure 4B ,, Figure 5A ,, Figure 5B ,, Figure 6 ,, Figure 7 and Figure 8 , an MR-DC UE (e.g., UE 120) is connected to an MN (e.g., the first base station 110) and an SN (e.g., the second base station 110), and the source PSCell serving the UE is associated with the SN.

[0085] Figure 3AAnd Figure 3B FIG. is a diagram showing an example 300 of a conditional PSCell change initiated by an SN. In example 300, the SN is a source SN, and the PSCell is changed to a candidate target PSCell associated with a target SN (e.g., a third base station 110). That is, in example 300, the conditional PSCell change is an inter-SN conditional PSCell change.

[0086] As shown by reference numeral 305, the UE may provide a measurement report (e.g., an RRC measurement report) to the source SN. In some aspects, the measurement report may include the results of measurements associated with the source PSCell of the UE and the results of measurements associated with a set of candidate target PSCs. Here, the set of candidate target PSCs includes one or more candidate target PSCs configured on the UE (e.g., at an earlier time).

[0087] As shown by reference numeral 310, the source SN may determine to initiate a conditional PSCell change (CPC) procedure at least in part based on the measurement report. For example, the source SN may determine that the results of measurements associated with the source PSCell do not meet a threshold (e.g., the signal strength associated with the source PSCell is below a signal strength threshold), and may determine to initiate a conditional PSCell change.

[0088] As shown by reference numeral 315, the source SN may send a change message (e.g., an SN change request message) to the MN at least in part based on determining to initiate a conditional PSCell change procedure. In some aspects, the change message may include an indicator indicating that a conditional PSCell change procedure is being initiated. In some aspects, as Figure 3A shown, the change message may include a set of n (n≥1) candidate target SN identifiers (e.g., T-SN1 ID, T-SNn ID). Here, each candidate target SN identifier corresponds to a respective candidate target SN for the UE included in the set of candidate target SNs.

[0089] As shown by reference numerals 320a and 320b, the MN may send an SN addition request message to each of the candidate target SNs at least in part based on the set of candidate target SN identifiers. As shown, in some aspects, the SN addition request message may include a conditional PSCell change indicator (e.g., an indication associated with the requested SN addition and a conditional PSCell change procedure).

[0090] As shown by reference numerals 325a and 325b, each candidate target SN can send an acknowledgment of the SN addition request (e.g., an SN addition request acknowledgment message) to the MN. In some aspects, the acknowledgment provided by a given candidate target SN can include information associated with the candidate target PSCell set, the SCG configuration associated with the candidate target PSCell set, and a data forwarding address (if needed) (e.g., for a bearer whose termination point will be moved).

[0091] As shown by reference numeral 330, the MN can send a reconfiguration message (e.g., an RRC reconfiguration message) to the UE when it receives acknowledgments from the candidate target SN set. As shown, in some aspects, the reconfiguration message can include configuration information associated with the conditional PSCell change (e.g., CPC_config). The configuration information can include, for example, information associated with each of the candidate target PSCell sets. As further shown, the reconfiguration message can include information indicating the conditions for each candidate target PSCell (e.g., T-PSCell1_CPC_exec_thresh, T-PSCell2_CPC_exec_thresh, etc.), which conditions (if met) will cause the UE to perform a conditional PSCell change.

[0092] As shown by reference numeral 335, the UE can receive the reconfiguration message and can provide a reconfiguration complete message (e.g., an RRC reconfiguration complete message) to the MN.

[0093] As shown by reference numeral 340, the UE can determine that the conditions for the conditional PSCell change have been met for a candidate target PSCell (e.g., one of the candidate target PSCell sets). For example, the UE can determine that the signal strength associated with the candidate target PSCell meets the threshold identified by the condition indicated for the candidate target PSCell, that the signal strength associated with the candidate target PSCell exceeds the signal strength associated with the source PSCell by the amount of the threshold identified by the condition indicated for the candidate target PSCell, etc.

[0094] As in Figure 3B shown by reference numeral 345, the UE can send a reconfiguration complete message (e.g., an RRC reconfiguration complete message) indicating that the UE has determined that the conditions for the conditional PSCell change have been met for the candidate target PSCell. In some aspects, the message includes information identifying the candidate target PSCell for which the UE has determined the conditions will be met.

[0095] In some aspects, at least partially based on receiving a reconfiguration complete message, the MN may also send a request to one or more candidate target SNs to release reserved resources for a candidate target PSCell associated with one or more other candidate target SNs. In some aspects, the request may include a list of candidate target PSCs for which reserved resources are to be released at one or more other target SNs. In some aspects, one or more candidate target SNs may release the reserved resources for the candidate target PSCell at least partially based on the request.

[0096] As shown by reference numeral 350, the MN may send an acknowledgment message associated with a conditional PSCell change (e.g., an SN change acknowledgment message) to the source SN. In some aspects, as shown, the acknowledgment message includes the data forwarding address of the target SN associated with the candidate target PSCell (e.g., Fwd_Addr_T-SN1) (e.g., so that the source SN can directly forward data to the target SN). In some aspects, the acknowledgment includes the data forwarding address of the MN (e.g., so that the source SN can forward data to the target SN via the MN). In some aspects, when receiving the acknowledgment message, the source SN releases the resources for the UE.

[0097] As shown by reference numeral 355, the MN may send an SN reconfiguration complete message to the target SN associated with the candidate target PSCell.

[0098] As shown by reference numerals 360a and 360b, the MN and the source SN may send respective SN status transfer messages to the target SN, after which data forwarding may begin, as indicated by reference numerals 365a (indirect data forwarding) and 365b (direct data forwarding).

[0099] As shown by reference numeral 370, the UE may then perform a random access channel (RACH) procedure on the candidate target PSCell. It should be noted that in some aspects, the UE may perform the RACH procedure at any time after determining that the conditions for a conditional PSCell change have been met for the candidate target PSCell (e.g., during the time when the operations associated with reference numerals 345 to 365 are being performed).

[0100] As shown by reference numeral 375, a path update procedure may be performed, and as shown by reference numeral 380, the MN may send a context release associated with the UE to the source SN.

[0101] Figure 4A and Figure 4BFIG. is a diagram illustrating example 400 of a conditional PSCell change initiated by an MN. In example 400, the SN is a source SN, and the PSCell is changed to a candidate target PSCell associated with a target SN. That is, in example 400, the conditional PSCell change is an inter-SN conditional PSCell change.

[0102] As shown by reference numeral 405, the UE may provide a measurement report (e.g., an RRC measurement report) to the MN. In some aspects, the measurement report may include results of measurements associated with the UE's source PSCell and / or results of measurements associated with a set of candidate target PSCs.

[0103] As shown by reference numeral 410, the MN may determine to initiate a conditional PSCell change procedure at least in part based on the measurement report. For example, the MN may determine that the results of measurements associated with the source PSCell do not meet a threshold (e.g., the signal strength associated with the source PSCell is below a signal strength threshold), and may determine to initiate a conditional PSCell change.

[0104] As shown by reference numerals 415a and 415b, the MN may send an SN addition request message to each of the candidate target SNs at least in part based on a set of candidate target SN identifiers associated with a set of candidate target PSCs for the UE. As shown, in some aspects, the SN addition request message may include a conditional PSCell change indicator (e.g., an indication associated with the requested SN addition being related to a conditional PSCell change procedure).

[0105] As shown by reference numerals 420a and 420b, each candidate target SN may send an acknowledgement of the SN addition request (e.g., an SN addition request acknowledgement message) to the MN. In some aspects, the acknowledgement provided by a given candidate target SN may include information associated with the set of candidate target PSCs, an SCG configuration associated with the set of candidate target PSCs, and a data forwarding address (if needed) (e.g., for a bearer whose termination point will be moved).

[0106] As shown by reference numeral 425, the MN may send a reconfiguration message (e.g., an RRC reconfiguration message) to the UE when acknowledgements are received from the set of candidate target SNs. As shown, in some aspects, the reconfiguration message may include configuration information associated with the conditional PSCell change. The configuration information may include, for example, information associated with each of the set of candidate target PSCs. As further shown, the reconfiguration message may include information indicating a condition for each candidate target PSC that, if satisfied, will cause the UE to perform a conditional PSCell change.

[0107] As indicated by reference numeral 430, the UE may receive a reconfiguration message and may provide a reconfiguration complete message (e.g., an RRC reconfiguration complete message) to the MN.

[0108] As indicated by reference numeral 435, the UE may determine that the conditions for a conditional PSCell change have been met for a candidate target PSCell (e.g., one candidate target PSCell in a set of candidate target PSCs). For example, the UE may determine that the signal strength associated with the candidate target PSCell meets a threshold identified by the conditions indicated for the candidate target PSCell, the signal strength associated with the candidate target PSCell exceeds the signal strength associated with the source PSCell by a threshold amount identified by the conditions indicated for the candidate target PSCell, etc.

[0109] As shown by reference numeral 440 in Figure 4B the UE may send a reconfiguration complete message (e.g., an RRC reconfiguration complete message) indicating that the UE has determined that the conditions for a conditional PSCell change have been met for the candidate target PSCell. In some aspects, the message includes information identifying the candidate target PSCell for which the UE has determined that the conditions will be met.

[0110] In some aspects, at least in part based on receiving the reconfiguration complete message, the MN may also send a request to one or more candidate target SNs to release reserved resources for a candidate target PSCell associated with one or more other candidate target SNs. In some aspects, the request may include a list of candidate target PSCs for which reserved resources are to be released at one or more other target SNs. In some aspects, one or more candidate target SNs may release the reserved resources for the candidate target PSCell at least in part based on the request.

[0111] As indicated by reference numeral 445, the MN may send an acknowledgment message (e.g., an SN release request message) associated with the conditional PSCell change to the source SN. In some aspects, the acknowledgment message includes a data forwarding address of the target SN associated with the candidate target PSCell (e.g., so that the source SN can directly forward data to the target SN). In some aspects, the acknowledgment includes a data forwarding address of the MN (e.g., so that the source SN can forward data to the target SN via the MN). In some aspects, when receiving the acknowledgment message, the source SN releases resources for the UE.

[0112] As indicated by reference numeral 450, the source SN may send and the MN may receive an acknowledgment of the release request (e.g., an SN release request acknowledgment message).

[0113] As shown by reference numeral 455, the MN may send an SN reconfiguration complete message to the target SN associated with the candidate target PSCell.

[0114] As shown by reference numerals 460a and 460b, the MN and the source SN (via the MN) may send corresponding SN status transfer messages to the target SN, after which data forwarding may start, as indicated by reference numerals 465a (indirect data forwarding) and 465b (direct data forwarding).

[0115] As shown by reference numeral 470, the UE may then perform a random access channel (RACH) procedure on the candidate target PSCell. It should be noted that, in some aspects, the UE may perform the RACH procedure at any time after determining that the conditions for a conditional PSCell change have been met for the candidate target PSCell (e.g., during the time when the operations associated with reference numerals 445 to 465 are being performed).

[0116] As shown by reference numeral 475, a path update procedure may be performed, and as shown by reference numeral 480, the MN may send a context release associated with the UE to the source SN.

[0117] Figure 5A and Figure 5B is a diagram illustrating example 500 of an SN-initiated and SN-executed conditional PSCell change. In example 500, the SN is the source SN, and the PSCell is being changed to a candidate target PSCell associated with the target SN. That is, in example 500, the conditional PSCell change is an inter-SN conditional PSCell change.

[0118] As shown by reference numeral 505, the UE may provide a measurement report (e.g., an RRC measurement report) to the source SN. In some aspects, the measurement report may include the results of measurements associated with the source PSCell of the UE and the results of measurements associated with a candidate target PSCell group. Here, the candidate target PSCell group includes one or more candidate target PSCells configured on the UE (e.g., at an earlier time).

[0119] As shown by reference numeral 510, the source SN may determine to initiate a conditional PSCell change procedure at least in part based on the measurement report. For example, the source SN may determine that the results of measurements associated with the source PSCell fail to meet a threshold (e.g., the signal strength associated with the source PSCell is below a signal strength threshold), and may determine to initiate a conditional PSCell change.

[0120] As shown by reference numeral 515, the source SN may send and the MN may receive an MN request message. In some aspects, the MN request message may include a request for providing an MCG configuration associated with the MN (e.g., request_CGConfigInfo) and a request for an SN key to be used for a conditional PSCell change (e.g., request_SNKey).

[0121] As shown by reference numeral 520, the MN may provide an MN response message to the SN, including the MCG configuration and the SN key.

[0122] As shown by reference numerals 525a and 525b, the source SN may send an SN addition request message to each of the candidate target SNs. As shown, in some aspects, the SN addition request message may include a conditional PSCell change indicator (e.g., an indication associated with the requested SN addition related to the conditional PSCell change procedure), the MCG configuration associated with the MN, and the SN key.

[0123] As shown by reference numerals 530a and 530b, each candidate target SN may send an acknowledgement of the SN addition request (e.g., an SN addition request acknowledgement message) to the source SN. In some aspects, the acknowledgement provided by a given candidate target SN may include information associated with the candidate target PSCell set, the SCG configuration associated with the candidate target PSCell set, and a data forwarding address (if needed) (e.g., for a bearer whose termination point is to be moved). In some aspects, the acknowledgement provided by a given candidate target SN may include an indication that one or more MN terminated split bearers associated with the MCG configuration were not accepted by the candidate target SN during the SN addition associated with the conditional PSCell change.

[0124] As shown by reference numeral 535, the source SN may send and the MN may receive a message indicating one or more MN terminated split bearers that were not accepted by the target SN.

[0125] As shown by reference numeral 540, the MN may send a modified MCG configuration to the source SN, at least in part based on the message indicating one or more MN terminated split bearers that were not accepted by the target SN. Here, the indicated one or more MN terminated split bearers may not be included in the modified MCG configuration (e.g., the MN may provide a modified MCG that does not include the indicated MN terminated split bearers).

[0126] As shown by reference numeral 545, the source SN can then send a reconfiguration message (e.g., an RRC reconfiguration message) to the UE (e.g., on signaling radio bearer (SRB) 3 or split SRB1). As shown, in some aspects, the reconfiguration message can include configuration information associated with a conditional PSCell change (e.g., CPC_config). The configuration information can include, for example, information associated with each of the candidate target PSCell sets. As further shown, the reconfiguration message can include information indicating the conditions for each candidate target PSCell (e.g., T-PSCell1_CPC_exec_thresh, T-PSCell2_CPC_exec_thresh, etc.), which conditions (if satisfied) will cause the UE to perform a conditional PSCell change. In some aspects, the reconfiguration message can include a conditional PSCell change configuration, which includes a modified MCG configuration and an SCG configuration.

[0127] As shown by reference numeral 550, the UE can receive the reconfiguration message and can provide a reconfiguration complete message (e.g., an RRC reconfiguration complete message) to the MN (e.g., on SRB1 or split SRB1).

[0128] As shown by reference numeral 555 in Figure 5B the UE can determine that the conditions for a conditional PSCell change have been met for a candidate target PSCell (e.g., one of the candidate target PSCell sets). For example, the UE can determine that the signal strength associated with the candidate target PSCell meets the threshold identified by the condition indicated for the candidate target PSCell, that the signal strength associated with the candidate target PSCell exceeds the signal strength associated with the source PSCell by a threshold amount, etc. As shown by reference numeral 560, the UE can then perform a RACH procedure on the candidate target PSCell.

[0129] As shown by reference numeral 565, the UE can send a reconfiguration complete message (e.g., an RRC reconfiguration complete message) to the candidate target SN (e.g., on SRB3 or split SRB1), which indicates that the UE has determined that the conditions for a conditional PSCell change have been met for the candidate target PSCell. In some aspects, the message includes information identifying the candidate target PSCell for which the UE has determined that the conditions will be met.

[0130] As shown by reference numeral 570, a candidate target SN may send a PSCell change success message to the source SN. In some aspects, the PSCell change success message may include information identifying the candidate target PSCell to which the UE has changed.

[0131] As shown by reference numeral 575, the source SN may send an SN status transfer message to the target SN, after which data forwarding may begin, as indicated by reference numeral 580.

[0132] As shown by reference numeral 585, a path update procedure may be performed. As shown by reference numeral 590, the source SN may send a UE context release request to the MN, and as shown by reference numeral 595, the MN may send a UE context release to the source SN.

[0133] Figure 6 FIG. 600 is a diagram illustrating an example of a conditional PSCell change within an SN initiated by an MN. In example 600, the PSCell is being changed to a candidate target PSCell associated with the SN. That is, in example 600, the conditional PSCell change is a conditional PSCell change within the SN.

[0134] As shown by reference numeral 605, the UE may provide a measurement report (e.g., an RRC measurement report) to the MN. In some aspects, the measurement report may include the results of measurements associated with the source PSCell of the UE and / or the results of measurements associated with a candidate target PSCell group.

[0135] As shown by reference numeral 610, the MN may determine to initiate a conditional PSCell change procedure at least in part based on the measurement report. For example, the MN may determine that the results of measurements associated with the source PSCell fail to meet a threshold (e.g., the signal strength associated with the source PSCell is below a signal strength threshold), and may determine to initiate a conditional PSCell change.

[0136] As shown by reference numeral 615, the MN may send an SN modification request message to the SN. As shown, in some aspects, the SN modification request message may include a conditional PSCell change indicator (e.g., an indication that the requested SN modification is associated with a conditional PSCell change procedure).

[0137] As shown by reference numeral 620, the SN may send an acknowledgement of the SN modification request (e.g., an SN modification request acknowledgement message) to the MN. In some aspects, the acknowledgement provided by the SN may include information associated with a candidate target PSCell set, an SCG configuration associated with the candidate target PSCell set, and a data forwarding address (if needed) (e.g., for a bearer whose termination point is to be moved).

[0138] As shown by reference numeral 625, the MN may send a reconfiguration message (e.g., an RRC reconfiguration message) to the UE. As shown, in some aspects, the reconfiguration message may include configuration information associated with a conditional PSCell change. The configuration information may include, for example, information associated with each of a set of candidate target PSCs. As further shown, the reconfiguration message may include information indicating a condition for each candidate target PSC, which condition (if satisfied) will cause the UE to perform a conditional PSCell change.

[0139] As shown by reference numeral 630, the UE may receive the reconfiguration message and may provide a reconfiguration complete message (e.g., an RRC reconfiguration complete message) to the MN.

[0140] As shown by reference numeral 635, the UE may determine that a condition for a conditional PSCell change has been satisfied for a candidate target PSC (e.g., one of the candidate target PSCs in a set of candidate target PSCs). For example, the UE may determine that the signal strength associated with the candidate target PSC meets a threshold identified by the condition indicated for the candidate target PSC, that the signal strength associated with the candidate target PSC exceeds the signal strength associated with the source PSC by a threshold amount, etc.

[0141] As shown by reference numeral 640, the UE may send a reconfiguration complete message (e.g., an RRC reconfiguration complete message) indicating that the UE has determined that a condition for a conditional PSCell change has been satisfied for the candidate target PSC. In some aspects, the message includes information identifying the candidate target PSC for which the UE has determined that the condition will be satisfied.

[0142] As shown by reference numeral 645, the MN may send an acknowledgement message associated with the conditional PSCell change (e.g., an SN reconfiguration complete message) to the SN.

[0143] As shown by reference numeral 650, the MN may send an SN status transfer message to the SN, after which data forwarding may begin, as indicated by reference numeral 655. As shown by reference numeral 660, a path update procedure may be performed.

[0144] Figure 7 FIG. 700 is a diagram illustrating an example 700 of an SN-initiated conditional PSCell change within the SN with MN participation. In example 700, the PSCell is being changed to a candidate target PSC associated with the SN. That is, in example 700, the conditional PSCell change is a conditional PSCell change within the SN.

[0145] As shown by reference numeral 705, the UE may provide a measurement report (e.g., an RRC measurement report) to the SN. In some aspects, the measurement report may include the results of measurements associated with the source PSCell of the UE and / or the results of measurements associated with a candidate target PSCell group.

[0146] As shown by reference numeral 710, the SN may determine to initiate a conditional PSCell change procedure at least in part based on the measurement report. For example, the SN may determine that the results of measurements associated with the source PSCell fail to meet a threshold (e.g., the signal strength associated with the source PSCell is below a signal strength threshold), and may determine to initiate a conditional PSCell change.

[0147] As shown by reference numeral 715, the SN may send an SN modification request message to the MN. As shown, in some aspects, the SN modification request message may include a conditional PSCell change indicator (e.g., an indication associated with the requested SN modification being related to a conditional PSCell change procedure).

[0148] As shown by reference numerals 720 and 725, in some aspects, the MN may send an SN modification request to the SN, and the SN may send an acknowledgement of the SN modification request (e.g., an SN modification request acknowledgement message) to the MN.

[0149] As shown by reference numeral 730, the MN may send a reconfiguration message (e.g., an RRC reconfiguration message) to the UE. As shown, in some aspects, the reconfiguration message may include configuration information associated with a conditional PSCell change. The configuration information may include, for example, information associated with each of a set of candidate target PSCells. As further shown, the reconfiguration message may include information indicating a condition for each candidate target PSCell, which condition (if satisfied) will cause the UE to perform a conditional PSCell change.

[0150] As shown by reference numeral 735, the UE may receive the reconfiguration message, and may provide a reconfiguration complete message (e.g., an RRC reconfiguration complete message) to the MN.

[0151] As shown by reference numeral 740, the UE may determine that the conditions for a conditional PSCell change have been met for a candidate target PSCell (e.g., one of the candidate target PSCs in a set of candidate target PSCs). For example, the UE may determine that the signal strength associated with the candidate target PSCell meets the threshold indicated by the condition identifier for the candidate target PSCell, that the signal strength associated with the candidate target PSCell exceeds the signal strength associated with the source PSCell by a threshold amount, etc.

[0152] As shown by reference numeral 745, the UE may send a reconfiguration complete message (e.g., RRC reconfiguration complete information), which indicates that the UE has determined that the conditions for a conditional PSCell change have been met for the candidate target PSCell. In some aspects, the message includes information identifying the candidate target PSCell for which the UE has determined that the conditions will be met.

[0153] As shown by reference numeral 750, the MN may send a confirmation message associated with the conditional PSCell change (e.g., SN reconfiguration complete message) to the SN.

[0154] As shown by reference numeral 755, the SN may send an SN status transfer message to the MN, after which data forwarding may begin, as indicated by reference numeral 760. As shown by reference numeral 765, the UE may perform a RACH procedure on the candidate target PSCell, and as shown by reference numeral 770, a path update procedure may be performed.

[0155] Figure 8 FIG. 800 is a diagram illustrating an example 800 of an SN-initiated conditional PSCell change within the SN without MN participation. In example 800, the PSCell is being changed to a candidate target PSCell associated with the SN. That is, in example 800, the conditional PSCell change is a conditional PSCell change within the SN.

[0156] As shown by reference numeral 805, the UE may provide a measurement report (e.g., RRC measurement report) to the SN. In some aspects, the measurement report may include the results of measurements associated with the UE's source PSCell and / or the results of measurements associated with a set of candidate target PSCs.

[0157] As shown by reference numeral 810, the SN may determine to initiate a conditional PSCell change procedure at least in part based on the measurement report. For example, the SN may determine that the results of the measurements associated with the source PSCell fail to meet a threshold (e.g., the signal strength associated with the source PSCell is below a signal strength threshold), and may determine to initiate a conditional PSCell change.

[0158] As indicated by reference numeral 815, the SN may send a reconfiguration message (e.g., an RRC reconfiguration message) to the UE (e.g., on SRB3 or split SRB1). As shown, in some aspects, the reconfiguration message may include configuration information associated with a conditional PSCell change. The configuration information may include, for example, information associated with each of a set of candidate target PSCs. As further shown, the reconfiguration message may include information indicating a condition for each candidate target PSC, which condition (if satisfied) will cause the UE to perform a conditional PSCell change.

[0159] As indicated by reference numeral 820, the UE may receive the reconfiguration message and may provide a reconfiguration complete message (e.g., an RRC reconfiguration complete message) to the SN (e.g., on SRB3 or split SRB1).

[0160] As indicated by reference numeral 825, the UE may determine that a condition for a conditional PSCell change has been satisfied for a candidate target PSC (e.g., one of a set of candidate target PSCs). For example, the UE may determine that the signal strength associated with the candidate target PSC meets a threshold identified by the condition indicated for the candidate target PSC, that the signal strength associated with the candidate target PSC exceeds the signal strength associated with the source PSC by a threshold amount, etc.

[0161] As indicated by reference numeral 830, the UE may send a reconfiguration complete message (e.g., an RRC reconfiguration complete message) (e.g., on SRB3 or split SRB1), the reconfiguration complete message indicating that the UE has determined that a condition for a conditional PSCell change has been satisfied for a candidate target PSC. In some aspects, the message includes information identifying the candidate target PSC for which the UE has determined that the condition will be satisfied.

[0162] As described above, in some aspects, a UE may perform a RACH procedure on a candidate target PSCell for which the UE has determined that the conditions for a conditional PSCell change have been met. However, in some cases, during the execution of the RACH procedure, the UE may experience a radio link failure on the MCG. In some aspects, the UE may detect a radio link failure on the MCG during the execution of the RACH procedure on the target PSCell and may perform an MCG failure information procedure after completing the RACH procedure. In some aspects, the UE may perform the MCG failure information procedure at least in part based on completing the RACH procedure before the expiration of a timer associated with the RACH procedure. In some aspects, performing the MCG failure information procedure may reduce the recovery latency (e.g., compared to an RRC reconstruction procedure) and may enable data flows established on the SN to continue (which is not possible during an RRC reconstruction procedure). In some aspects, if the timer expires before the UE completes the RACH procedure, the UE may perform an RRC reconstruction procedure.

[0163] As noted above, Figure 3A 、 Figure 3B 、 Figure 4A 、 Figure 4B 、 Figure 5A 、 Figure 5B 、 Figure 6 、 Figure 7 and Figure 8 are provided as examples. Other examples may be different from the examples described with respect to Figure 3A 、 Figure 3B 、 Figure 4A 、 Figure 4B 、 Figure 5A 、 Figure 5B 、 Figure 6 、 Figure 7 and Figure 8 described with respect to

[0164] Figure 9 is a diagram illustrating an example procedure 900 performed, for example, by an MN in accordance with the present disclosure. Example procedure 900 is an example of operations performed by an MN (e.g., base station 110, etc.) associated with signaling aspects of a conditional PSCell change procedure in MR-DC.

[0165] As Figure 9As shown, in some aspects, process 900 may include: receiving a message indicating that the UE has determined that the conditions for a conditional PSCell change have been met for a candidate target PSCell, where the candidate target PSCell is one of the candidate target PSCell set associated with the UE in the conditional PSCell change configuration (block 910). For example, the MN (e.g., using the transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may receive a message indicating that the UE (e.g., UE 120) has determined that the conditions for a conditional PSCell change have been met for a candidate target PSCell, as described above. In some aspects, the candidate target PSCell is one of the candidate target PSCell set associated with the UE in the conditional PSCell change configuration.

[0166] As Figure 9 As further shown, in some aspects, process 900 may include: sending an acknowledgment message associated with the conditional PSCell change to the source SN (block 920). For example, the MN (e.g., using the transmit processor 220, controller / processor 240, memory 242, etc.) may send an acknowledgment message associated with the conditional PSCell change to the source SN (e.g., base station 110), as described above.

[0167] Process 900 may include additional aspects, such as any individual aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0168] In a first aspect, the MN and the source SN are nodes in a multi-radio access technology dual-connection configuration.

[0169] In a second aspect, either alone or in combination with the first aspect, the acknowledgment message includes a data forwarding address of the target SN associated with the candidate target PSCell.

[0170] In a third aspect, either alone or in combination with one or more of the first and second aspects, the candidate target PSCell is a first candidate target PSCell associated with a first target SN, and process 900 further includes: sending a request to a second target SN to release reserved resources for a second candidate target PSCell associated with the second target SN, where the second candidate target PSCell is one of the candidate target PSCell set.

[0171] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, the request includes a list of candidate target PSCs for which reserved resources are to be released at a second target SN, and the list of candidate target PSCs includes a second candidate target PSC.

[0172] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the confirmation message is an SN change confirmation message.

[0173] In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, the confirmation message is an SN release request message.

[0174] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, a conditional PSC change is associated with an SN-initiated conditional PSC change procedure.

[0175] In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, a conditional PSC change is associated with an SN-initiated in-SN conditional PSC change procedure involving the MN.

[0176] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, procedure 900 includes: receiving an indication from a source SN that a conditional PSC change procedure is being initiated.

[0177] In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the indication is included in a change message that further includes information identifying a set of target SNs.

[0178] In an eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, the indication is included in a modification message that further includes a conditional PSC change indicator.

[0179] In a twelfth aspect, either alone or in combination with one or more of the first to eleventh aspects, a conditional PSC change is associated with an MN-initiated conditional PSC change procedure.

[0180] In a thirteenth aspect, either alone or in combination with one or more of the first to twelfth aspects, a conditional PSC change is associated with an MN-initiated in-SN conditional PSC change procedure.

[0181] Although Figure 9illustrates example blocks of process 900, but in some aspects, process 900 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner compared to those depicted in Figure 9 In addition or alternatively, two or more of the blocks of process 900 may be performed in parallel.

[0182] Figure 10 is a diagram illustrating an example process 1000 performed, for example, by an MN in accordance with the present disclosure. Example process 1000 is an example of an operation performed by an MN (e.g., base station 110, etc.) associated with signaling aspects of a conditional PSCell change procedure in MR-DC.

[0183] As Figure 10 shown, in some aspects, process 1000 may include: receiving, from a source SN, a message indicating one or more MN terminated split bearers that were not accepted by a target SN during SN addition associated with a conditional PSCell change (block 1010). For example, an MN (e.g., using a receiving processor 238, a controller / processor 240, a memory 242, etc.) may receive, from a source SN (e.g., base station 110), a message indicating one or more MN terminated split bearers that were not accepted by a target SN (e.g., base station 110) during SN addition associated with a conditional PSCell change, as described above.

[0184] As Figure 10 further shown, in some aspects, process 1000 may include: sending, to the source SN, a modified MCG configuration excluding the indicated one or more MN terminated split bearers from the modified MCG configuration (block 1020). For example, an MN (e.g., using a sending processor 220, a controller / processor 240, a memory 242, etc.) may send, to the source SN, a modified MCG configuration excluding the indicated one or more MN terminated split bearers from the modified MCG configuration, as described above.

[0185] Process 1000 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0186] In a first aspect, a conditional PSCell change is associated with an SN-initiated and SN-executed conditional PSCell change procedure.

[0187] Although Figure 10 illustrates example blocks of process 1000, but in some aspects, process 1000 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner compared to those depicted in Figure 10fewer boxes, different boxes, or boxes arranged in a different manner than those depicted. Additionally or alternatively, two or more of the boxes of process 1000 may be performed in parallel.

[0188] Figure 11 is a diagram illustrating an example process 1100 performed, for example, by a source SN according to the present disclosure. Example process 1100 is an example of operations performed by a source SN (e.g., base station 110, etc.) associated with signaling aspects of a conditional PSCell change procedure in MR-DC.

[0189] As Figure 11 shown, in some aspects, process 1100 may include: receiving, from an MN, an acknowledgment message that indicates that a UE has determined that a candidate target PSCell has met the conditions for a conditional PSCell change (block 1110). For example, a source SN (e.g., using a receiving processor 238, a controller / processor 240, a memory 242, etc.) may receive, from an MN (e.g., base station 110), an acknowledgment message that indicates that a UE (e.g., UE 120) has determined that a candidate target PSCell has met the conditions for a conditional PSCell change, as described above.

[0190] As Figure 11 further shown, in some aspects, process 1100 may include: forwarding data associated with the UE to the MN or to a target SN associated with the candidate target PSCell, at least in part based on the acknowledgment message (block 1120). For example, a base station (e.g., using a transmitting processor 220, a receiving processor 238, a controller / processor 240, a memory 242, etc.) may forward data associated with the UE to the MN or to a target SN associated with the candidate target PSCell, at least in part based on the acknowledgment message, as described above.

[0191] Process 1100 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0192] In a first aspect, the acknowledgment message includes a data forwarding address of a target SN associated with the candidate target PSCell.

[0193] In a second aspect, alone or in combination with the first aspect, the acknowledgment message is an SN change acknowledgment message.

[0194] In a third aspect, alone or in combination with one or more of the first and second aspects, the acknowledgment message is an SN release request message.

[0195] In a fourth aspect, alone or in combination with one or more of the first to third aspects, a conditional PSCell change is associated with an SN-initiated conditional PSCell change procedure.

[0196] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, a conditional PSCell change is associated with an SN-initiated in-SN conditional PSCell change procedure with MN participation.

[0197] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, procedure 1100 includes: sending an indication that a conditional PSCell change procedure is being initiated.

[0198] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the indication is included in a change message that further includes information identifying a set of target SNs, the set of target SNs including the target SN.

[0199] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the indication is included in a modification message that further includes a conditional PSCell change indicator.

[0200] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the indication is included in an add request message that further includes a conditional PSCell change indicator.

[0201] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, a conditional PSCell change is associated with an MN-initiated conditional PSCell change procedure.

[0202] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, a conditional PSCell change is associated with an SN-initiated and SN-executed conditional PSCell change procedure.

[0203] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, procedure 1100 includes: receiving, from the target SN, information identifying one or more MN-terminated split bearers that were not accepted by the target SN during SN addition associated with the conditional PSCell change; and sending, to the MN, a message indicating the indicated one or more MN-terminated split bearers.

[0204] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, process 1100 includes: receiving, from the MN, a modified MCG configuration, with the indicated one or more MN-terminated split bearers excluded from the modified MCG configuration.

[0205] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, process 1100 includes: sending, to the UE, a reconfiguration message including a conditional PSCell change configuration, the conditional PSCell change configuration including the modified MCG configuration and a secondary cell group configuration.

[0206] Although Figure 11 example boxes of process 1100 are shown, in some aspects, process 1100 may include additional boxes, fewer boxes, different boxes, or boxes arranged in a different manner compared to those depicted in Figure 11 In addition or alternatively, two or more of the boxes of process 1100 may be executed in parallel.

[0207] Figure 12 is a diagram illustrating an example process 1200, such as performed by a target SN, in accordance with the present disclosure. Example process 1200 is an example of operations performed by a target SN (such as base station 110, etc.) associated with signaling aspects of a conditional PSCell change process in MR-DC.

[0208] As Figure 12 shown, in some aspects, process 1200 may include: receiving a request to release reserved resources for a candidate target PSCell associated with the target SN, the candidate target PSCell being one of a set of candidate target PSCs associated with a conditional PSCell change associated with the UE (block 1210). For example, the target SN (such as using receive processor 238, controller / processor 240, memory 242, etc.) may receive a request to release reserved resources for a candidate target PSCell associated with the target SN, as described above. In some aspects, the candidate target PSCell is one of a set of candidate target PSCs associated with a conditional PSCell change associated with the UE (such as UE 120).

[0209] As Figure 12Further shown, in some aspects, process 1200 may include: releasing reserved resources of a candidate target PSCell at least in part based on a request (block 1220). For example, the target SN (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may release reserved resources of a candidate target PSCell at least in part based on a request, as described above.

[0210] Process 1200 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0211] In a first aspect, the request identifies a set of candidate target PSCs for which to release reserved resources, and the candidate target PSC is included in the set of candidate target PSCs.

[0212] While Figure 12 example blocks of process 1200 are shown, in some aspects, process 1200 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner compared to those depicted in Figure 12 . Additionally or alternatively, two or more of the blocks of process 1200 may be executed in parallel.

[0213] Figure 13 is a diagram illustrating an example process 1300, such as may be performed by a target SN, in accordance with the present disclosure. Example process 1300 is an example of operations performed by a target SN (e.g., base station 110, etc.) associated with signaling aspects of a conditional PSCell change process in MR-DC.

[0214] As Figure 13 shown, in some aspects, process 1300 may include: receiving a message that indicates that the UE has determined that conditions for a conditional PSCell change have been met for a candidate target PSCell (block 1310). For example, the target SN (e.g., using receive processor 238, controller / processor 240, memory 242, etc.) may receive a message that indicates that the UE (e.g., UE 120) has determined that conditions for a conditional PSCell change have been met for a candidate target PSCell, as described above.

[0215] As Figure 13As further shown, in some aspects, process 1300 may include: sending an acknowledgment message associated with a conditional PSCell change to a source SN, the acknowledgment message including a candidate target PSCell identifier of a candidate target PSCell (block 1320). For example, a target SN station (e.g., using a sending processor 220, a controller / processor 240, a memory 242, etc.) may send an acknowledgment message associated with a conditional PSCell change to a source SN (e.g., base station 110), the acknowledgment message including a candidate target PSCell identifier of a candidate target PSCell, as described above.

[0216] Process 1300 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0217] Although Figure 13 example blocks of process 1300 are shown, in some aspects, process 1300 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner compared to those depicted in Figure 13 . Additionally or alternatively, two or more of the blocks of process 1300 may be executed in parallel.

[0218] Figure 14 FIG. is a diagram illustrating an example process 1400, such as may be performed by a UE, in accordance with the present disclosure. Example process 1400 is an example of operations performed by a UE (e.g., UE 120, etc.) associated with signaling aspects of a conditional PSCell change process in MR-DC.

[0219] As Figure 14 shown, in some aspects, process 1400 may include: detecting a radio link failure on the MCG during a RACH procedure performed on a target PSCell, where the UE has determined that conditions for a conditional PSCell change have been met for the target PSCell (block 1410). For example, a UE (e.g., using a receiving processor 258, a sending processor 264, a controller / processor 280, a memory 282, etc.) may detect a radio link failure on the MCG during a RACH procedure performed on a target PSCell, where the UE has determined that conditions for a conditional PSCell change have been met for the target PSCell, as described above.

[0220] As Figure 14Further shown, in some aspects, process 1400 may include: performing a MCG failure information process (block 1420) after completing the RACH process, at least in part based on detecting a radio link failure on the MCG during execution of the RACH process. For example, a UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may perform a MCG failure information process after completing the RACH process, at least in part based on detecting a radio link failure on the MCG during execution of the RACH process, as described above.

[0221] Process 1400 may include additional aspects, such as any individual aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0222] In one aspect, the MCG failure information process is performed at least in part based on completing the RACH process before the expiration of a timer associated with the RACH process.

[0223] Although Figure 14 example blocks of process 1400 are shown, in some aspects, process 1400 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner compared to those depicted in Figure 14 . Additionally or alternatively, two or more of the blocks of process 1400 may be performed in parallel.

[0224] The following provides a summary of some aspects of the present disclosure:

[0225] Aspect 1: A method of wireless communication performed by an MN, comprising: receiving a message indicating that a UE has determined that a condition for a conditional PSCell change has been met for a candidate target PSCell, the candidate target PSCell being one of a set of candidate target PSCs associated with the UE in a conditional PSCell change configuration; and sending an acknowledgment message associated with the conditional PSCell change to a source SN.

[0226] Aspect 2: The method according to aspect 1, wherein the MN and the source SN are nodes in a multi-radio access technology dual-connectivity configuration.

[0227] Aspect 3: The method according to any one of aspects 1-2, wherein the acknowledgment message includes a data forwarding address of a target SN associated with the candidate target PSCell.

[0228] Aspect 4: The method according to any one of Aspects 1 - 3, wherein the candidate target PSCell is a first candidate target PSCell associated with a first target SN, and wherein the method further comprises: sending a request to a second target SN for releasing reserved resources for a second candidate target PSCell associated with the second target SN, the second candidate target PSCell being one of the candidate target PSCells in the set of candidate target PSCells.

[0229] Aspect 5: The method according to Aspect 4, wherein the request includes a list of candidate target PSCells for which reserved resources are to be released at the second target SN, the list of candidate target PSCells including the second candidate target PSCell.

[0230] Aspect 6: The method according to any one of Aspects 1 - 5, wherein the confirmation message is an SN change confirmation message.

[0231] Aspect 7: The method according to any one of Aspects 1 - 5, wherein the confirmation message is an SN release request message.

[0232] Aspect 8: The method according to any one of Aspects 1 - 7, wherein the conditional PSCell change is associated with an SN-initiated conditional PSCell change procedure.

[0233] Aspect 9: The method according to any one of Aspects 1 - 7, wherein the conditional PSCell change is associated with an SN-initiated in-SN conditional PSCell change procedure with MN participation.

[0234] Aspect 10: The method according to any one of Aspects 1 - 9, further comprising: receiving an indication from the source SN that a conditional PSCell change procedure is being initiated.

[0235] Aspect 11: The method according to Aspect 10, wherein the indication is included in a change message, the change message further including information identifying a set of target SNs.

[0236] Aspect 12: The method according to Aspect 10, wherein the indication is included in a modification message, the modification message further including a conditional PSCell change indicator.

[0237] Aspect 13: The method according to any one of Aspects 1 - 7 or 10 - 12, wherein the conditional PSCell change is associated with an MN-initiated conditional PSCell change procedure.

[0238] Aspect 14: The method according to any one of Aspects 1-7 or 10-12, wherein the conditional PSCell change is associated with a conditional PSCell change procedure within the SN initiated by the MN.

[0239] Aspect 15: A method of wireless communication performed by an MN, comprising: receiving, from a source SN, a message indicating one or more MN terminated split bearers that were not accepted by a target SN during SN addition associated with a conditional PSCell change; and sending a modified MCG configuration to the source SN, with the indicated one or more MN terminated split bearers excluded from the modified MCG configuration.

[0240] Aspect 16: The method according to Aspect 15, wherein the conditional PSCell change is associated with a conditional PSCell change procedure initiated and performed by the SN.

[0241] Aspect 17: A method of wireless communication performed by a source SN, comprising: receiving, from an MN, an acknowledgment message indicating that a UE has determined that a candidate target PSCell has met the conditions for a conditional PSCell change; and forwarding data associated with the UE to the MN or to a target SN associated with the candidate target PSCell, at least in part based on the acknowledgment message.

[0242] Aspect 18: The method according to Aspect 17, wherein the acknowledgment message includes a data forwarding address of the target SN associated with the candidate target PSCell.

[0243] Aspect 19: The method according to any one of Aspects 17-18, wherein the acknowledgment message is an SN change acknowledgment message.

[0244] Aspect 20: The method according to any one of Aspects 17-18, wherein the acknowledgment message is an SN release request message.

[0245] Aspect 21: The method according to any one of Aspects 17-20, wherein the conditional PSCell change is associated with a conditional PSCell change procedure initiated by the SN.

[0246] Aspect 22: The method according to any one of Aspects 17-20, wherein the conditional PSCell change is associated with a conditional PSCell change procedure within the SN initiated by the SN with MN participation.

[0247] Aspect 23: The method according to any one of Aspects 17-22, further comprising: sending an indication that a conditional PSCell change procedure is being initiated.

[0248] Aspect 24: The method according to aspect 23, wherein the indication is included in a change message, the change message further including information identifying a target SN set, the target SN set including the target SN.

[0249] Aspect 25: The method according to aspect 23, wherein the indication is included in a modification message, the modification message further including a conditional PSCell change indicator.

[0250] Aspect 26: The method according to aspect 23, wherein the indication is included in an addition request message, the addition request message further including a conditional PSCell change indicator.

[0251] Aspect 27: The method according to any one of aspects 17 - 20 or 23 - 26, wherein the conditional PSCell change is associated with a MN-initiated conditional PSCell change procedure.

[0252] Aspect 28: The method according to any one of aspects 17 - 20 or 23 - 26, wherein the conditional PSCell change is associated with a SN-initiated and SN-executed conditional PSCell change procedure.

[0253] Aspect 29: The method according to any one of aspects 17 - 28, further comprising: receiving, from the target SN, information identifying one or more MN-terminated split bearers that were not accepted by the target SN during SN addition associated with the conditional PSCell change; and sending, to the MN, a message indicating the indicated one or more MN-terminated split bearers.

[0254] Aspect 30: The method according to aspect 29, further comprising: receiving, from the MN, a modified MCG configuration, the indicated one or more MN-terminated split bearers being excluded from the modified MCG configuration.

[0255] Aspect 31: The method according to aspect 30, further comprising: sending, to the UE, a reconfiguration message including a conditional PSCell change configuration, the conditional PSCell change configuration including the modified MCG configuration and a secondary cell group configuration.

[0256] Aspect 32: A method for wireless communication performed by a target SN, comprising: receiving a request to release reserved resources for a candidate target PSCell associated with the target SN, the candidate target PSCell being one of a set of candidate target PSCs associated with a conditional PSCell change associated with a user equipment; and releasing the reserved resources for the candidate target PSCell at least in part based on the request.

[0257] Aspect 33: The method according to aspect 32, wherein the request identifies a set of candidate target PSCs for which reserved resources are to be released, and the candidate target PSC is included in the set of candidate target PSCs.

[0258] Aspect 34: A method for wireless communication performed by a target SN, comprising: receiving a message indicating that the UE has determined that a condition for a conditional PSCell change has been met for a candidate target PSCell; and sending an acknowledgment message associated with the conditional PSCell change to the source SN, the acknowledgment message including a candidate target PSCell identifier of the candidate target PSCell.

[0259] Aspect 35: A method for wireless communication performed by a UE, comprising: detecting a radio link failure on the MCG during a RACH procedure on a target PSCell, the UE having determined that a condition for a conditional PSCell change has been met for the target PSCell; and performing an MCG failure information procedure after completion of the RACH procedure at least in part based on detecting the radio link failure on the MCG during the performing of the RACH procedure.

[0260] Aspect 36: The method according to aspect 35, wherein the MCG failure information procedure is performed at least in part based on completing the RACH procedure before expiration of a timer associated with the RACH procedure.

[0261] Aspect 37: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the device to perform the method of one or more of aspects 1-14.

[0262] Aspect 38: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the method of one or more of aspects 1-14.

[0263] Aspect 39: A device for wireless communication, comprising at least one unit configured to perform the method of one or more of Aspects 1 - 14.

[0264] Aspect 40: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform the method of one or more of Aspects 1 - 14.

[0265] Aspect 41: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set including one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 1 - 14.

[0266] Aspect 42: A device for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the device to perform the method of one or more of Aspects 15 - 16.

[0267] Aspect 43: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors configured to perform the method of one or more of Aspects 15 - 16.

[0268] Aspect 44: A device for wireless communication, comprising at least one unit configured to perform the method of one or more of Aspects 15 - 16.

[0269] Aspect 45: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform the method of one or more of Aspects 15 - 16.

[0270] Aspect 46: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set including one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 15 - 16.

[0271] Aspect 47: A device for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the device to perform the method of one or more of Aspects 17 - 31.

[0272] Aspect 48: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the method of one or more of aspects 17-31.

[0273] Aspect 49: A device for wireless communication, comprising at least one unit for performing the method of one or more of aspects 17-31.

[0274] Aspect 50: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more of aspects 17-31.

[0275] Aspect 51: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions which, when executed by one or more processors of a device, cause the device to perform the method of one or more of aspects 17-31.

[0276] Aspect 52: A device for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the device to perform the method of one or more of aspects 32-33.

[0277] Aspect 53: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the method of one or more of aspects 32-33.

[0278] Aspect 54: A device for wireless communication, comprising at least one unit for performing the method of one or more of aspects 32-33.

[0279] Aspect 55: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more of aspects 32-33.

[0280] Aspect 56: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions which, when executed by one or more processors of a device, cause the device to perform the method of one or more of aspects 32-33.

[0281] Aspect 57: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the device to perform the method of aspect 34.

[0282] Aspect 58: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the method of aspect 34.

[0283] Aspect 59: A device for wireless communication, comprising at least one unit for performing the method of aspect 34.

[0284] Aspect 60: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform the method of aspect 34.

[0285] Aspect 61: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set including one or more instructions which, when executed by one or more processors of a device, cause the device to perform the method of aspect 34.

[0286] Aspect 62: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the device to perform the method of one or more of aspects 35-36.

[0287] Aspect 63: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the method of one or more of aspects 35-36.

[0288] Aspect 64: A device for wireless communication, comprising at least one unit for performing the method of one or more of aspects 1-36.

[0289] Aspect 65: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform the method of one or more of aspects 35-36.

[0290] Aspect 66: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set including one or more instructions which, when executed by one or more processors of a device, cause the device to perform the method of one or more of aspects 35-36.

[0291] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit aspects to the precise forms disclosed. Modifications and variations can be made in accordance with the above disclosure, or can be obtained from practice of the aspects.

[0292] As used herein, the term "component" is intended to be broadly construed as a combination of hardware and / or hardware and software. Whether referred to as software, firmware, middleware, microcode, hardware description language, or other names, "software" shall be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, processes, and / or functions, and other examples. As used herein, a processor is implemented with a combination of hardware and / or hardware and software.

[0293] As used herein, depending on the context, meeting a threshold can refer to a value greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, etc.

[0294] It will be apparent that the systems and / or methods described herein can be implemented in different forms of hardware and / or combinations of hardware and software. The actual specific control hardware or software code used to implement these systems and / or methods is not a limitation on the aspects. Accordingly, the operations and behavior of the systems and / or methods are described herein without reference to specific software code, it being understood that software and hardware can be designed to implement the systems and / or methods at least in part based on the description herein.

[0295] As used herein, depending on the context, meeting a threshold can refer to a value greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, etc.

[0296] Even if a particular combination of features is recited in the claims and / or disclosed in the specification, such combinations are not intended to limit the disclosure of the various aspects. In fact, many of these features may be combined in ways not specifically recited in the claims and / or specifically disclosed in the specification. Although each dependent claim listed below may depend directly on only one claim, the disclosure of the various aspects includes combinations of each dependent claim with every other claim in the set of claims. As used herein, the phrase referring to a list of items “at least one of” refers to any combination of those items, including a single member. By way of example, “at least one of the following: a, b, or c” is intended to cover a, b, c, a - b, a - c, b - c, and a - b - c, as well as any combination of multiples of the same elements (e.g., a - a, a - a - a, a - a - b, a - a - c, a - b - b, a - c - c, b - b, b - b - b, b - b - c, c - c, and c - c - c or any other ordering of a, b, and c).

[0297] None of the elements, acts, or instructions used herein should be construed as critical or essential unless expressly described as such. Further, as used herein, the articles “a” and “an” are intended to include one or more items and may be used interchangeably with “one or more.” Further, as used herein, the article “the” is intended to include one or more items referred to in conjunction with the article “the” and may be used interchangeably with “one or more.” Further, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, unrelated items, or a combination of related and unrelated items) and may be used interchangeably with “one or more.” Where only one item is intended, the phrase “only one” or similar language is used. Further, as used herein, the terms “has,” “have,” “having,” etc. are intended to be open - ended terms. Further, unless expressly stated otherwise, the phrase “based on” is intended to mean “at least partially based on.” Further, as used herein, the term “or” when used in a series is intended to be inclusive and may be used interchangeably with “and / or” unless expressly stated otherwise (e.g., if used in conjunction with “either” or “only one of”).

Claims

1. A master node (MN) for wireless communication, comprising: A memory; And One or more processors coupled to the memory, the one or more processors being configured to: Receive a message from a source secondary node (SN), the message indicating one or more MN terminated split bearers that were not accepted by a target SN during SN addition associated with a conditional primary secondary cell (PSCell) change; And Send a modified master cell group (MCG) configuration to the source SN, the indicated one or more MN terminated split bearers being excluded from the modified MCG configuration.

2. The MN according to claim 1, wherein The MN and the source SN are nodes in a multi-radio access technology dual-connectivity configuration.

3. The MN according to claim 1, wherein the one or more processors are further configured to: send an acknowledgment message associated with the conditional PSCell change to the source SN, wherein, The confirmation message includes a data forwarding address of the target SN associated with the candidate target PSCell.

4. The MN according to claim 1, wherein The candidate target PSCell is a first candidate target PSCell associated with a first target SN, and wherein the one or more processors are further configured to: Send a request to a second target SN to release reserved resources for a second candidate target PSCell associated with the second target SN, the second candidate target PSCell being one of the candidate target PSCell set.

5. The MN according to claim 4, wherein The request includes a list of candidate target PSCs for which reserved resources are to be released at the second target SN, the list of candidate target PSCs including the second candidate target PSC.

6. The MN according to claim 3, wherein The confirmation message is an SN change confirmation message.

7. The MN according to claim 3, wherein The confirmation message is an SN release request message.

8. The MN according to claim 1, wherein The conditional PSCell change is associated with an SN-initiated conditional PSCell change procedure.

9. The MN according to claim 1, wherein The one or more processors are further configured to: receive an indication from the source SN that a conditional PSCell change procedure is being initiated.

10. The MN according to claim 9, wherein, The indication is included in a change message, the change message further including information identifying a set of target SNs.

11. The MN according to claim 9, wherein, The indication is included in a modification message, the modification message further including a conditional PSCell change indicator.

12. A source secondary node (SN) for wireless communication, comprising: A memory; And One or more processors coupled to the memory, the one or more processors being configured to: Receive a confirmation message from a master node (MN), the confirmation message indicating that a user equipment (UE) has determined that a candidate target primary secondary cell (PSCell) has met the conditions for a conditional PSCell change; And At least partially based on the confirmation message, forward data associated with the UE to the MN or to a target SN in the set of target SNs associated with the candidate target PSCell, the source SN being characterized in that the one or more processors are further configured to: Receive information from the target SN, the information identifying one or more MN terminated split bearers that were not accepted by the target SN during SN addition associated with the conditional PSCell change; and Send a message to the MN(s) indicating that the indicated one or more MNs terminate the split bearer.

13. The source SN according to claim 12, wherein, The confirmation message includes the data forwarding address of the target SN associated with the candidate target PSCell.

14. The source SN according to claim 12, wherein, The confirmation message is an SN change confirmation message.

15. The source SN according to claim 12, wherein, The confirmation message is an SN release request message.

16. The source SN according to claim 12, wherein, The conditional PSCell change is associated with an SN-initiated conditional PSCell change procedure.

17. The source SN according to claim 12, wherein The one or more processors are further configured to: send an indication that a conditional PSCell change procedure is being initiated.

18. The source SN according to claim 17, wherein, The indication is included in a change message, which further includes the information identifying the set of target SNs.

19. The source SN according to claim 17, wherein, The indication is included in a modification message, which further includes a conditional PSCell change indicator.

20. The source SN according to claim 17, wherein The indication is included in an add request message, which further includes a conditional PSCell change indicator.

21. The source SN according to claim 12, wherein, The conditional PSCell change is associated with SN-initiated and SN-executed conditional PSCell change procedures.

22. The source SN according to claim 12, wherein, The one or more processors are further configured to: Receive a modified master cell group (MCG) configuration from the MN(s), with the indicated one or more MNs terminating the split bearer excluded from the modified MCG configuration; And Send a reconfiguration message to the UE including a conditional PSCell change configuration, the conditional PSCell change configuration including the modified MCG configuration and the secondary cell group configuration.

23. A target secondary node (SN) for wireless communication, comprising: A memory; And One or more processors coupled to the memory, the one or more processors being configured to: Receive a message indicating that a user equipment (UE) has determined that conditions for a conditional PSCell change have been met for a candidate target primary secondary cell (PSCell); Send a confirmation message associated with the conditional PSCell change to the source SN, the confirmation message including a candidate target PSCell identifier of the candidate target PSCell; And Send information to the source SN identifying one or more master node (MN) terminated split bearers not accepted by the target SN during SN addition associated with the conditional PSCell change.

24. The target SN according to claim 23, wherein, The one or more processors are further configured to: Receive a request to release reserved resources for the candidate target PSCell associated with the target SN, the candidate target PSCell being one of a set of candidate target PSCs associated with the conditional PSCell change associated with the UE; and Release the reserved resources of the candidate target PSCell at least in part based on the request.

25. The target SN according to claim 24, wherein, The request identifies the set of candidate target PSCs for which reserved resources are to be released, and the candidate target PSC is included in the set of candidate target PSCs.

26. A method for wireless communication at a master node (MN), comprising: Receive a message from a source secondary node (SN), the message indicating one or more MN terminated split bearers that were not accepted by a target SN during SN addition associated with a conditional primary secondary cell (PSCell) change; And Send a modified master cell group (MCG) configuration to the source SN, with the indicated one or more MN terminated split bearers excluded from the modified MCG configuration.

27. The method according to claim 26, wherein The MN and the source SN are nodes in a multi-radio access technology dual connectivity configuration.

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