Patent Description:
For example, a fifth generation (<NUM>) wireless communications technology (which may be referred to as new radio (NR) technology) is envisaged to expand and support diverse usage scenarios and applications with respect to current mobile network generations. In an aspect, <NUM> communications technology may include: enhanced mobile broadband addressing human-centric use cases for access to multimedia content, services and data; ultra-reliable-low latency communications (URLLC) with certain specifications for latency and reliability; and massive machine type communications, which may allow a very large number of connected devices and transmission of a relatively low volume of non-delay-sensitive information. As the demand for mobile broadband access continues to increase, however, further improvements in NR communications technology and beyond may be desired. < insert page 2a >.

Systems, methods, and apparatus presented herein each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein.

In an aspect, a method of wireless communication by a user equipment (UE) as defined by independent claim <NUM> is provided.

In another aspect, a method of wireless communication by an apparatus of a PSCell associated with an SCG as defined by independent claim <NUM> is provided. <NPL>) relates to suspended SCG in RRC CONNECTED mode. It is proposed that all SCells should be in deactivated in suspended SCG. Further, it is proposed that the UE dormant behavior on NR SCell should be applied on PSCell in suspended SCG. Furthermore, it is proposed that the UE is required to perform RLM on PSCell in suspended SCG. Moreover, it is proposed that L1 dormancy indication for SCell dormancy indication can be used on PSCell to suspend SCG. In addition, it is proposed that the UE can trigger RACH procedure on PSCell to resume SCG. Finally, it is proposed that the MN can send the SCG resumption indication to UE in MCG to resume SCG. <CIT> is directed to beam failure recovery procedure in a multicarrier communication system. A wireless device receives one or more messages comprising one or more configuration parameters of a cell. A beam failure recovery procedure of the cell is initiated based on a beam failure detection for the cell. The cell is transitioned into a dormant state during the beam failure recovery procedure. A channel state information for the cell is reported in the dormant state. The beam failure recovery procedure is aborted based on the transitioning the cell into the dormant state during the beam failure recovery procedure. <NPL>) discusses the concept of "dormancy" behavior in NR system for Fast SCell Activation. In NR, the BWP concept was introduced. The dormant BWP configuration is for dormancy behavior. Thereby, it is possible to configure per UE or per cell. <CIT> refers to resource management for beam failure recovery procedures. Thereby, a base station may configure and/or transmit a beam failure recovery medium access control element (BFR MAC CE) to a wireless device to configure particular cells to use particular assigned candidate beams from a pool of shared candidate beams during beam failure recovery operations.

In other aspects, computer readable mediums having instructions that cause one or more processors to perform one or more methods herein are provided. In other aspects, apparatus having means for performing one or more methods herein are provided.

Multiple-radio dual-connectivity (MR-DC) may allow a user equipment (UE) to communicate with two radio access networks (RANs), for example, utilizing two frequency bands. One RAN may be provided by a master node (MN) and the other RAN may be provided by a secondary node (SN). The UE may communicate with a group of cells in each of the RANs. For example, the MN may include a master cell group (MCG) and the SN may include a secondary cell group (SCG). In some scenarios, the SCG for the UE may be dormant. For instance, when a data rate for the UE is sufficiently low, the UE is overheating, or based on specific traffic types (e.g., voice over internet protocol (VOIP)), the SCG for the UE may be placed in a dormant SCG state. In the dormant SCG state, the LTE may have reduced power consumption and limited communications and measurements (e.g., downlink (DL) control, data monitoring, radio resource management (RRM), channel status information (CSI) measurements) on the SCG.

The present disclosure provides techniques for the UE to transition from the dormant SCG state to an active SCG state using beam failure and radio link failure (RLF) procedures on a primary SCG cell (PSCell) of the SCG while the UE is in the dormant SCG state. In particular, a goal of the UE during the dormant SCG state is to achieve power saving with reduced latency for the SCG during a transition from the dormant SCG state to the active SCG state. In doing so, additional signaling and measurements for beam management may be used for frequency range designations FR1 (e.g., <NUM> - <NUM>) and FR2 (e.g., <NUM> - <NUM>). Examples of the measurements include RRMs, radio link monitoring (RLMs), beam failure detection (BFD) measurements, and, in some cases, Layer <NUM> (L1) measurements. In an example, L1 measurements include CSI measurements and sounding reference signal (SRS) transmissions that enable mechanisms such as beam management, time tracking, etc..

In an aspect, an RLM procedure may be enabled on the PSCELL when the SCG is in the dormant SCG state to detect a radio link failure (RLF) on the PSCell. As opposed to conventional RLM methods, which only apply RLM procedures to active bandwidth parts, in this proposal the RLM procedure is performed on the dormant bandwidth parts of the PSCELL. In an example, the RLM procedure may be performed on the PSCell and not secondary cells (SCells) of the SCG. For example, for new radio dual connectivity (NR-DC) intraband carrier aggregation (CA), both the PSCell and the SCells may use FR2, which may result in measurements of the PSCell that highly correlate to the SCells of the SCG in this case.

In another aspect, a BFD procedure is performed to detect BFD. The BFD procedure may be performed on both the PSCELL and SCELLs of the SCG. For E-tran new radio dual connectivity (EN-DC) interband CA, the PSCell may use FR1 and the SCells may use FR2, which may result in measurements of the PSCell that do not correlate with the SCells of the SCG in this case. For example, the Quasi Co-Locations (QCLs) / spatial relationships on the PSCELL and SCELLs may be vastly different in the EN-DC interband CA.

In the dormant SCG state, the RLM procedure may ensure that the PSCell RLF and beam failure are detected, and the BFD may ensure that the beam failure on the SCells are detected.

Regarding BFD, if a beam failure is detected, a beam failure report may be communicated to an SN by sending a beam failure report through a random access channel (RACH) to the SN through the PSCell. In an example, the RACH message may be performed with a best DL beam of the PSCell or the SCells being identified after the BFD.

Alternatively, if a beam failure is detected, the beam failure report may be communicated to the SN with the best DL beam (or buffer status report) through the MCG of the MN. In this example, the communication may be done via radio resource control (RRC) signaling, media access control control element (MAC CE) signaling, or DL control information (DCI) signaling.

After the SN receives the report, the SN may notify the UE whether to perform a beam failure recovery (BFR) on the SCG or not. If the BFR is needed, the SN may give the UE contention free resources to RACH. If the BFR is not needed, the SN may indicate to the UE to remain in the dormant SCG state.

Whether to send the report to the SN via a RACH message or the MCG may be configured at a start of the dormancy SCG state or dynamically configured and sent to the SCG through MCG during dormancy.

Regarding RLF, if an RLF is detected, a message can be sent to the SN through the MCG. In response to the message, the SN may decide to stay in an RLF state for a duration of time, as the SCG is in dormancy and may not need immediate recovery. Alternatively, the SN may trigger measurements on the SCells to see if the PScell can be replaced with one of the SCells in the SCG.

Performing the additional signaling and measurements, including RLM and BFD as described herein, may provide quick transition out of the dormant SCG state, as compared to methods used without these signaling and measurements.

Storage media may be any available media that may be accessed by a computer. By way of example, and not limitation, such computer-readable media may comprise a random-access memory (RAM), a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that may be used to store computer executable code in the form of instructions or data structures that may be accessed by a computer.

Turning now to the figures, examples of systems, apparatus, and methods for RLF recovery and beam failure recovery on SCG in a dormancy state are depicted. It is to be understood that aspects of the figures may not be drawn to scale and are instead drawn for illustrative purposes.

The wireless communications system (also referred to as a wireless wide area network (WWAN)) includes at least one base station <NUM>, UEs <NUM>, an Evolved Packet Core (EPC) <NUM>, and a <NUM> Core (5GC) <NUM>. The base station <NUM> may include macro cells (high power cellular base station) and/or small cells (low power cellular base station).

In some implementations, the base station <NUM> may include a modem <NUM> and/or an SCG recovery component <NUM> for recovering the SCG on the UE <NUM>. In some implementations, the UE <NUM> may include a modem <NUM> and/or an SCG dormancy management component <NUM> for managing SCG during a dormant SCG state.

A base station <NUM> configured for <NUM> LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC <NUM> through backhaul links interfaces <NUM> (e.g., S1, X2, Internet Protocol (IP), or flex interfaces). A base station <NUM> configured for <NUM> NR (collectively referred to as Next Generation RAN (NG-RAN)) may interface with 5GC <NUM> through backhaul links interfaces <NUM> (e.g., S1, X2, Internet Protocol (IP), or flex interface). In addition to other functions, the base station <NUM> may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment trace, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base station <NUM> may communicate directly or indirectly (e.g., through the EPC <NUM> or 5GC <NUM>) with each other over the backhaul links interfaces <NUM>. The backhaul links <NUM>, <NUM> may be wired or wireless.

The base station <NUM> may wirelessly communicate with the UEs <NUM>. Each of the base station <NUM> may provide communication coverage for a respective geographic coverage area <NUM>. For example, the small cell <NUM>' may have a coverage area <NUM>' that overlaps the coverage area <NUM> of one or more macro base station <NUM>. A network that includes both small cell and macro cells may be known as a heterogeneous network. A heterogeneous network may also include Home Evolved Node base station (eNBs) (HeNBs), which may provide service to a restricted group known as a closed subscriber group (CSG). The communication links <NUM> between the base station <NUM> and the UEs <NUM> may include uplink (UL) (also referred to as reverse link) transmissions from a UE <NUM> to a base station <NUM> and/or DL (also referred to as forward link) transmissions from a base station <NUM> to a UE <NUM>. The base station <NUM> / UEs <NUM> may use spectrum up to Y MHz (e.g., <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, etc. MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Yx MHz (x component carriers) used for transmission in each direction. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or less carriers may be allocated for DL than for UL).

A base station <NUM>, whether a small cell <NUM>' or a large cell (e.g., macro base station), may include an eNB, gNodeB (gNB), or other type of base station. Extremely high frequency (EHF) is part of the radio frequency (RF) in the electromagnetic spectrum. The mmW base station <NUM> may utilize beamforming <NUM> with the UE <NUM> to compensate for the path loss and short range.

The MBMS Gateway <NUM> may be used to distribute MBMS traffic to the base station <NUM> belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information.

The 5GC <NUM> may include a Access and Mobility Management Function (AMF) <NUM>, other AMFs <NUM>, a Session Management Function (SMF) <NUM>, and a User Plane Function (UPF) <NUM>. The AMF <NUM> is the control node that processes the signaling between the UEs <NUM> and the 5GC <NUM>.

The base station <NUM> may also be referred to as a gNB, Node B, evolved Node B (eNB), an access point, a base transceiver station, a radio base station, an access point, an access node, a radio transceiver, a NodeB, eNodeB (eNB), gNB, Home NodeB, a Home eNodeB, a relay, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmit reception point (TRP), or some other suitable terminology. The base station <NUM> provides an access point to the EPC <NUM> or 5GC <NUM> for a UE <NUM>. Some of the UEs <NUM> may be referred to as loT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc.).

Referring to <FIG>, an example implementation of the UE <NUM> may include the modem <NUM> having the SCG dormancy management component <NUM>. The modem <NUM> and/or the SCG dormancy management component <NUM> of the UE <NUM> may be configured to manage communications to the base station <NUM> via a cellular network, a Wi-Fi network, or other wireless and wired networks.

In some implementations, the UE <NUM> may include a variety of components, including components such as one or more processors <NUM> and memory <NUM> and transceiver <NUM> in communication via one or more buses <NUM>, which may operate in conjunction with the modem <NUM> and the SCG dormancy management component <NUM> to enable one or more of the functions described herein related to dormancy management of the UE <NUM>. Further, the one or more processors <NUM>, modem <NUM>, memory <NUM>, transceiver <NUM>, RF front end <NUM> and one or more antennas <NUM>, may be configured to support voice and/or data calls (simultaneously or non-simultaneously) in one or more radio access technologies. The one or more antennas <NUM> may include one or more antennas, antenna elements and/or antenna arrays.

In an aspect, the one or more processors <NUM> may include the modem <NUM> that uses one or more modem processors. The various functions related to the SCG dormancy management component <NUM> may be included in the modem <NUM> and/or the processors <NUM> and, in an aspect, may be executed by a single processor, while in other aspects, different ones of the functions may be executed by a combination of two or more different processors. For example, in an aspect, the one or more processors <NUM> may include any one or any combination of a modem processor, or a baseband processor, or a digital signal processor, or a transmit processor, or a receiving device processor, or a transceiver processor associated with transceiver <NUM>. Additionally, the modem <NUM> may configure the UE <NUM> along with the processors <NUM>. In other aspects, some of the features of the one or more processors <NUM> and/or the modem <NUM> associated with the SCG dormancy management component <NUM> may be performed by the transceiver <NUM>.

Also, the memory <NUM> may be configured to store data used herein and/or local versions of applications <NUM> or the SCG dormancy management component <NUM> and/or one or more subcomponents of the SCG dormancy management component <NUM> being executed by at least one processor <NUM>. The memory <NUM> may include any type of computer-readable medium usable by a computer or at least one processor <NUM>, such as random access memory (RAM), read only memory (ROM), tapes, magnetic discs, optical discs, volatile memory, non-volatile memory, and any combination thereof. In an aspect, for example, the memory <NUM> may be a non-transitory computer-readable storage medium that stores one or more computer-executable codes defining the SCG dormancy management component <NUM> and/or one or more of its subcomponents, and/or data associated therewith, when the UE <NUM> is operating at least one processor <NUM> to execute the SCG dormancy management component <NUM> and/or one or more of the subcomponents.

The transceiver <NUM> may include at least one receiver <NUM> and at least one transmitter <NUM>. The receiver <NUM> may include hardware, firmware, and/or software code executable by a processor for receiving data, the code comprising instructions and being stored in a memory (e.g., computer-readable medium). The receiver <NUM> may be, for example, an RF receiving device. In an aspect, the receiver <NUM> may receive signals transmitted by at least one base station <NUM>. The transmitter <NUM> may include hardware, firmware, and/or software code executable by a processor for transmitting data, the code comprising instructions and being stored in a memory (e.g., computer-readable medium). A suitable example of the transmitter <NUM> may include, but is not limited to, an RF transmitter.

Moreover, in an aspect, the UE <NUM> may include the RF front end <NUM>, which may operate in communication with one or more antennas <NUM> and the transceiver <NUM> for receiving and transmitting radio transmissions, for example, wireless communications transmitted by at least one base station <NUM> or wireless transmissions transmitted by the UE <NUM>. The RF front end <NUM> may be coupled with one or more antennas <NUM> and may include one or more low-noise amplifiers (LNAs) <NUM>, one or more switches <NUM>, one or more power amplifiers (PAs) <NUM>, and one or more filters <NUM> for transmitting and receiving RF signals.

In an aspect, the LNA <NUM> may amplify a received signal at a desired output level. In an aspect, each of the LNAs <NUM> may have a specified minimum and maximum gain values. In an aspect, the RF front end <NUM> may use one or more switches <NUM> to select a particular LNA <NUM> and the specified gain value based on a desired gain value for a particular application.

Further, for example, one or more PA(s) <NUM> may be used by the RF front end <NUM> to amplify a signal for an RF output at a desired output power level. In an aspect, each of the PAs <NUM> may have specified minimum and maximum gain values. In an aspect, the RF front end <NUM> may use one or more switches <NUM> to select a particular PA <NUM> and the specified gain value based on a desired gain value for a particular application.

Also, for example, one or more filters <NUM> may be used by the RF front end <NUM> to filter a received signal to obtain an input RF signal. Similarly, in an aspect, for example, a respective filter <NUM> may be used to filter an output from a respective PA <NUM> to produce an output signal for transmission. In an aspect, each filter <NUM> may be coupled with a specific LNA <NUM> and/or PA <NUM>. In an aspect, the RF front end <NUM> may use one or more switches <NUM> to select a transmit or receive path using a specified filter <NUM>, the LNA <NUM>, and/or the PA <NUM>, based on a configuration as specified by the transceiver <NUM> and/or processor <NUM>.

As such, the transceiver <NUM> may be configured to transmit and receive wireless signals through one or more antennas <NUM> via the RF front end <NUM>. In an aspect, the transceiver <NUM> may be tuned to operate at specified frequencies such that the UE <NUM> may communicate with, for example, one or more of the base stations <NUM> or one or more cells associated with one or more of the base stations <NUM>. In an aspect, for example, the modem <NUM> may configure the transceiver <NUM> to operate at a specified frequency and power level based on a UE configuration of the UE <NUM> and the communication protocol used by the modem <NUM>.

In an aspect, the modem <NUM> may be a multiband-multimode modem, which may process digital data and communicate with the transceiver <NUM> such that the digital data is sent and received using the transceiver <NUM>. In an aspect, the modem <NUM> may be multiband and be configured to support multiple frequency bands for a specific communications protocol. In an aspect, the modem <NUM> may be multimode and be configured to support multiple operating networks and communications protocols. In an aspect, the modem <NUM> may control one or more components of the UE <NUM> (e.g., RF front end <NUM>, transceiver <NUM>) to enable transmission and/or reception of signals from the network based on a specified modem configuration. In an aspect, a modem configuration may be based on the mode of the modem <NUM> and the frequency band in use. In another aspect, the modem configuration may be based on UE configuration information associated with the UE <NUM> as provided by the network (e.g., base station <NUM>).

Referring to <FIG>, an example implementation of the base station <NUM> may include the modem <NUM> with the SCG recovery component <NUM> configured to recover SCG on the UE <NUM>. The modem <NUM> and/or the SCG recovery component <NUM> of the base station <NUM> may be configured to communicate with the UE <NUM> via a cellular network, a Wi-Fi network, or other wireless and wired networks.

In some implementations, the base station <NUM> may include a variety of components, including components such as one or more processors <NUM> and memory <NUM> and transceiver <NUM> in communication via one or more buses <NUM>, which may operate in conjunction with the modem <NUM> and the SCG recovery component <NUM> to enable one or more of the functions described herein related to SCG recovery. Further, the one or more processors <NUM>, the modem <NUM>, the memory <NUM>, the transceiver <NUM>, a RF front end <NUM>, and one or more antennas <NUM>, may be configured to support voice and/or data calls (simultaneously or non-simultaneously) in one or more radio access technologies. The one or more antennas <NUM> may include one or more antennas, antenna elements and/or antenna arrays.

In an aspect, the one or more processors <NUM> may include the modem <NUM> that uses one or more modem processors. The various functions related to the SCG recovery component <NUM> may be included in the modem <NUM> and/or the processors <NUM> and, in an aspect, may be executed by a single processor, while in other aspects, different ones of the functions may be executed by a combination of two or more different processors. For example, in an aspect, the one or more processors <NUM> may include any one or any combination of a modem processor, or a baseband processor, or a digital signal processor, or a transmit processor, or a receiving device processor, or a transceiver processor associated with the transceiver <NUM>. Additionally, the modem <NUM> may configure the base station <NUM> and the processors <NUM>. In other aspects, some of the features of the one or more processors <NUM> and/or the modem <NUM> associated with the SCG recovery component <NUM> may be performed by the transceiver <NUM>.

Also, the memory <NUM> may be configured to store data used herein and/or local versions of applications <NUM> or the SCG recovery component <NUM>, and/or one or more subcomponents of the SCG recovery component <NUM> being executed by at least one processor <NUM>. The memory <NUM> may include any type of computer-readable medium usable by a computer or at least one processor <NUM>, such as random access memory (RAM), read only memory (ROM), tapes, magnetic discs, optical discs, volatile memory, non-volatile memory, and any combination thereof. In an aspect, for example, the memory <NUM> may be a non-transitory computer-readable storage medium that stores one or more computer-executable codes defining the SCG recovery component <NUM> and/or one or more of the subcomponents, and/or data associated therewith, when the base station <NUM> is operating at least one processor <NUM> to execute the SCG recovery component <NUM> and/or one or more of the subcomponents.

The transceiver <NUM> may include at least one receiver <NUM> and at least one transmitter <NUM>. The at least one receiver <NUM> may include hardware, firmware, and/or software code executable by a processor for receiving data, the code comprising instructions and being stored in a memory (e.g., computer-readable medium). The receiver <NUM> may be, for example, an RF receiving device. In an aspect, the receiver <NUM> may receive signals transmitted by the UE <NUM>. The transmitter <NUM> may include hardware, firmware, and/or software code executable by a processor for transmitting data, the code comprising instructions and being stored in a memory (e.g., computer-readable medium). A suitable example of the transmitter <NUM> may include, but is not limited to, an RF transmitter.

Moreover, in an aspect, the base station <NUM> may include the RF front end <NUM>, which may operate in communication with one or more antennas <NUM> and the transceiver <NUM> for receiving and transmitting radio transmissions, for example, wireless communications transmitted by other base stations <NUM> or wireless transmissions transmitted by the UE <NUM>. The RF front end <NUM> may be coupled with one or more antennas <NUM> and may include one or more low-noise amplifiers (LNAs) <NUM>, one or more switches <NUM>, one or more power amplifiers (PAs) <NUM>, and one or more filters <NUM> for transmitting and receiving RF signals.

Further, for example, one or more PA(s) <NUM> may be used by the RF front end <NUM> to amplify a signal for an RF output at a desired output power level. In an aspect, the RF front end <NUM> may use one or more switches <NUM> to select a particular PA <NUM> and the specified gain value based on a desired gain value for a particular application.

Also, for example, one or more filters <NUM> may be used by the RF front end <NUM> to filter a received signal to obtain an input RF signal. Similarly, in an aspect, for example, a respective filter <NUM> may be used to filter an output from a respective PA <NUM> to produce an output signal for transmission. In an aspect, each filter <NUM> may be coupled with a specific LNA <NUM> and/or PA <NUM>. In an aspect, the RF front end <NUM> may use one or more switches <NUM> to select a transmit or receive path using a specified filter <NUM>, the LNA <NUM>, and/or the PA <NUM>, based on a configuration as specified by the transceiver <NUM> and/or the processor <NUM>.

As such, the transceiver <NUM> may be configured to transmit and receive wireless signals through one or more antennas <NUM> via the RF front end <NUM>. In an aspect, transceiver may be tuned to operate at specified frequencies such that the base station <NUM> may communicate with, for example, the UE <NUM> or one or more cells associated with one or more base station <NUM>. In an aspect, for example, the modem <NUM> may configure the transceiver <NUM> to operate at a specified frequency and power level based on the base station configuration of the base station <NUM> and the communication protocol used by the modem <NUM>.

In an aspect, the modem <NUM> may be a multiband-multimode modem, which may process digital data and communicate with the transceiver <NUM> such that the digital data is sent and received using the transceiver <NUM>. In an aspect, the modem <NUM> may be multiband and be configured to support multiple frequency bands for a specific communications protocol. In an aspect, the modem <NUM> may be multimode and be configured to support multiple operating networks and communications protocols. In an aspect, the modem <NUM> may control one or more components of the base station <NUM> (e.g., RF front end <NUM>, transceiver <NUM>) to enable transmission and/or reception of signals from the network based on a specified modem configuration. In an aspect, the modem configuration may be based on the mode of the modem <NUM> and the frequency band in use. In another aspect, the modem configuration may be based on a base station configuration associated with the base station <NUM>.

Referring to <FIG>, examples of communications between the UE <NUM>, an MN <NUM>, and an SN <NUM> are disclosed. In these examples, the UE <NUM> may initially be in dual connectivity with the MN <NUM> and the SN <NUM>. In these examples, the MN <NUM> includes an MCG having a set of cells communicatively coupled to the MN <NUM>, and the SN <NUM> includes an SCG having a set of cells communicatively coupled to the SN <NUM>. Further, for these examples, the SCG has entered a dormancy state with the UE <NUM> but the MCG is in an active communication state with the UE <NUM>. As described herein, the SCG may be dormant, for example, to preserve power on the UE <NUM>, for certain traffic types (e.g., VOIP), or for any other reasoning.

Turning to <FIG>, an example beam failure procedure <NUM> including communications between the UE <NUM> and the SN <NUM> without the use of the MN <NUM>, is provided. The UE <NUM> may determine that the SCG is in a dormant SCG state <NUM> based on, for example, receiving a message from the MN <NUM> indicating the SCG dormancy, a dormancy SCG setting (e.g., dormancy bit), or any other method for determining a dormancy state.

When the SCG enters the dormant SCG state <NUM>, the UE <NUM> may trigger a BFD procedure <NUM> on the PSCell and/or the SCells of the SCG. In an example, during the BFD procedure <NUM>, the UE <NUM> may monitor the PSCell or the SCell. The BFD procedure <NUM> may look at one or more measurements of the PSCell or the SCell made by the SN <NUM> and sent to the UE <NUM> after the dormant SCG state <NUM>. The measurements of the PScell or the SCell may be obtained, for example, via one or more reference signals from the SN <NUM>.

During the BFD procedure <NUM>, the UE <NUM> may also compare the measurements to one or more thresholds to determine whether a beam failure is detected. For example one or more of an RSRP or SINR may be compared to one or more thresholds. If one or more of the thresholds indicate a beam failure occurred, the UE <NUM> determines BFD <NUM> on the PSCell or the SCell occurred. In response to the detection of BFD <NUM>, the UE <NUM> may perform a best DL beam procedure <NUM> for the UE <NUM> to determine a best DL beam to communicate with the SN <NUM>. In an example, the UE <NUM> may determine the best DL beam from a plurality of DL beams of the SCG based on one or more of the measurements from the SN <NUM>. An example of a best DL beam may include a DL beam for the plurality of DL beams having, for example, the signal power greater than signal powers of other DL beams of the plurality of DL beams.

Further in response to the detection of BFD <NUM>, the UE <NUM> may also transmit a RACH message <NUM> to the SN <NUM> on the PSCell. The RACH message <NUM> may include a BFD report and in some examples, a best beam identification identifying the best DL beam <NUM> for the SN <NUM> to communicate with the UE <NUM>.

While use of the RACH message <NUM> through the PSCell may allow the SN <NUM> to perform beam failure recovery (BFR), use of the DL beam may be risky as the UL beam may have failed. Also, sending the RACH message <NUM> may be contention based (e.g., competing with other UEs RACH messages) or non-contention based. In the case of a contention based RACH, the UE <NUM> may send a preamble to the SN <NUM> to allow the RACH procedure to be more likely to work, than if the preamble is not sent. In an example, the SN <NUM> may designate the preamble to the UE <NUM> prior to the SCG entering the dormant SCG state <NUM> thereby providing a more direct connection for the UE <NUM> to communicate with the SN <NUM> via a RACH procedure.

Turning to <FIG>, an example beam failure procedure <NUM> including communications between the UE <NUM> and the SN <NUM> through the MN <NUM> is provided. As the dormant SCG state <NUM>, the BFD procedure <NUM>, the BFD <NUM>, and best DL beam procedure <NUM> have been previously described.

In response to the detection of BFD <NUM>, the UE <NUM> may transmit a BFD message <NUM> to the MN <NUM> using the MCG. In an example, the BFD message <NUM> may include a BFD report indicating the beam failure of the PSCell and/or the SCell along with a request to the MN <NUM> to forward the BFD report to the SN <NUM>. In another example, the BFD message <NUM> may also include the identification of the best DL beam for communicating with the SN <NUM> identified through the best DL beam procedure <NUM>.

In response to the BFD message <NUM>, the MN <NUM> may forward the BFD message <NUM> including the BFD report and, in some examples, the identification of the best DL beam to the SN <NUM>.

Based on the BFD report, the SN <NUM> may perform a BFR decision <NUM> to determine whether to perform BFR of the PSCell or the SCell. In an example, the SN <NUM> may determine to transition the SCG to an active SCG state based on, for example, communication needs (e.g., UE <NUM> has data to transmit or expects to receive data) of the UE <NUM>. In this example, the SN <NUM> may determine to perform BFR with the UE <NUM>.

In response to the BFR decision <NUM> of performing the BFR, the SN <NUM> may transmit a BFR message <NUM> to the MN <NUM>. The BFR message <NUM> may include an indication of BFR resources, such as RACH resources, for the UE <NUM> to communicate with the SN <NUM>. The BFR message <NUM> may also include a request to the MN <NUM> to forward the BFR message <NUM> to the UE <NUM>.

In response to the BFR message <NUM>, the MN <NUM> may forward the BFR message <NUM> including the indication of the BFR resources to the UE <NUM>.

In response to the BFR message <NUM> and based on the BFR resources indicated by the SN <NUM>, the UE <NUM> may transmit a RACH message <NUM> to the SN <NUM> to perform the BFR.

In an example, each of the BFD message <NUM>, the BFD message <NUM>, the BFR message <NUM>, and the BFR message <NUM> may be transmitted in one or more of an RRC message, a MAC CE message, or a DCI message.

Turning to <FIG>, another example beam failure procedure <NUM> including communications between the UE <NUM> and the SN <NUM> through the MN <NUM> is provided. As the BFD message <NUM> and the BFD message <NUM> have been previously described.

As previously indicated, based on the BFD report, the SN <NUM> may perform a BFR decision <NUM> to determine whether to perform BFR of the PSCell or the SCell. As the SCG is dormant, there may not be a need for the SCG to transition to an active SCG state. For example, the UE <NUM> may be using a particular type of communication (e.g., VOIP) that does not use the SCG, or the UE <NUM> may be overheating. In this example, the SN <NUM> may determine not to perform BFR with the UE <NUM>.

Therefore, in response to the BFR decision <NUM> of not performing the BFR, the SN <NUM> may transmit a BFR message <NUM> to the MN <NUM>. The BFR message <NUM> may include an indication of not performing the BFR and a request to the MN <NUM> to forward the BFR message <NUM> to the UE <NUM>. In an example, the indication may be one or more bits indicating the decision of the SN <NUM>. In response to the BFR message <NUM>, the MN <NUM> may forward the BFR message <NUM> including the indication of not performing the BFR to the UE <NUM>. In this example, in response to the UE <NUM> receiving the indication of not performing the BFR, the SCG remains in a dormant SCG state thereby the UE <NUM> does not communicate via the SCG.

In an example, each of the BFR message <NUM> and the BFR message <NUM> may be transmitted in one or more of an RRC message, a MAC CE message, or a DCI message.

Turning to <FIG>, an example RLF recovery procedure <NUM> including communications between the UE <NUM> and the SN <NUM> through the MN <NUM> is provided. As the dormant SCG state <NUM> has been previously described, further details are not provided in this example.

When the SCG enters the dormant SCG state <NUM>, the UE <NUM> may trigger a RLF procedure <NUM> on the PSCell of the SCG. In an example, during the RLF procedure <NUM>, the UE <NUM> may monitor the PSCell. The RLF procedure <NUM> may look at one or more measurements of the PSCell made by the SN <NUM> and sent to the UE <NUM> after the dormant SCG state <NUM>. The measurements of the PScell may be obtained, for example, via one or more reference signals from the SN <NUM>.

During the RLF procedure <NUM>, the UE <NUM> may also compare the measurements to one or more thresholds to determine whether a RLF is detected. For example, one or more of an RSRP or an SINR may be compared to one or more thresholds. If one or more of the thresholds indicate a RLF occurred, the UE <NUM> determines RLF <NUM> on the PSCell occurred.

In response to the detection of RLF <NUM>, the UE <NUM> may transmit an RLF message <NUM> to the MN <NUM> using the MCG. In an example, the RLF message <NUM> may include an RLF report indicating the RLF of the PSCell along with a request to the MN <NUM> to forward the RLF report to the SN <NUM>. In response to the RLF message <NUM>, the MN <NUM> may forward RLF message <NUM> including the RLF report to the SN <NUM>.

Based on the RLF report, the SN <NUM> may perform an RLF decision <NUM> to determine whether to perform RLF of the PSCell. In an example, the SN <NUM> may determine to transition the SCG to an active SCG state based on, for example, communication needs (e.g., UE <NUM> has data to transmit or expects to receive data) of the UE <NUM>. In this example, the SN <NUM> may determine not to perform RLF recovery with the UE <NUM>.

Therefore, in response to the RLF decision <NUM> of not performing the RLF recovery, the SN <NUM> may transmit a no change message <NUM> to the MN <NUM>. The no change message <NUM> may include an indication of not performing the RLF recovery and a request to the MN <NUM> to forward the no change message <NUM> to the UE <NUM>. In an example, the indication may be one or more bits indicating the no change decision of the SN <NUM>. In response to the no change message <NUM>, the MN <NUM> may forward no change message <NUM> including the indication of not performing the RLF recovery to the UE <NUM>. In this example, in response to the UE <NUM> receiving the indication of not performing the RLF recovery, the SCG remains in a dormant SCG state thereby the UE <NUM> does not communicate via the SCG.

In an example, each of the RLF message <NUM>, the RLF message <NUM>, the no change message <NUM>, and the no change message <NUM> may be transmitted in one or more of an RRC message, a MAC CE message, or a DCI message.

Turning to <FIG>, an example RLF recovery procedure <NUM> including communications between the UE <NUM> and the SN <NUM> through the MN <NUM> is provided. As the dormant SCG state <NUM>, the RLF procedure <NUM>, the RLF <NUM>, the RLF message <NUM>, the RLF message <NUM>, and RLF decision <NUM> have been previously described, further details are not provided in this example.

As previously described, based on the RLF report, the SN <NUM> may perform the RLF decision <NUM> to determine whether to perform RLF of the PSCell. In an example, the SN <NUM> may determine to transition the SCG to an active SCG state based on, for example, communication needs (e.g., UE <NUM> has data to transmit or expects to receive data) of the UE <NUM>. In this example, the SN <NUM> may determine to perform the RLF recovery with the UE <NUM>.

Therefore, in response to the RLF decision <NUM> of performing the RLF recovery, the SN <NUM> may transmit a SCell trigger message <NUM> to the MN <NUM>. The SCell trigger message <NUM> may include SCell measurements request for the UE <NUM> to perform measurements of the SCells. The SCell trigger message <NUM> may also include a request to the MN <NUM> to forward the SCell trigger message <NUM> to the UE <NUM>. In response to the SCell trigger message <NUM>, the MN <NUM> may forward SCell trigger message <NUM> including the SCell measurements request to the UE <NUM>.

In response to the UE <NUM> receiving the SCell trigger message <NUM>, the UE <NUM> may perform measurements (e.g., RSRP or SINR) of one or more SCells to determine whether the PSCell can be replaced by an SCell.

The UE <NUM> may transmit a measurement message <NUM> to the MN <NUM> indicating results of the measurements of the one or more SCells along with a request to the MN <NUM> to forward the measurement message <NUM> to the SN <NUM>. In response to the measurement message <NUM>, the MN <NUM> may forward measurement message <NUM> including the results of the SCell measurements to the SN <NUM>.

In an example, the SN <NUM> may review the results of the SCell measurements and make a determination <NUM> to replace the PSCell with an SCell. In an example, the SN <NUM> may make the determination <NUM> to replace the PSCell with the SCell by selecting the SCell based on the measurements indicating the SCell having, for example, a higher signal power than the PSCell.

Therefore, in response to the determination <NUM> to replace the PSCell, the SN <NUM> may transmit a replacement message <NUM> to the MN <NUM>. The replacement message <NUM> may include an indication of the SCell the UE <NUM> should use to replace the PSCell along with a request to the MN <NUM> to forward the replacement message <NUM> to the UE <NUM>. In an example, the indication of the SCell may include an identification of the SCell selected by the SN <NUM>. In response to the replacement message <NUM>, the MN <NUM> may forward replacement message <NUM> including the indication of the selected SCell to replace the PSCell to the UE <NUM>.

The UE <NUM> may receive the replacement message <NUM> and change the SCell to the new PSCell <NUM>. For example, the UE <NUM> may store the identification of the SCell as the PSCell for future communications. Once the new PSCell is stored, the UE <NUM> may transmit a RACH message on the new PSCell to the SN <NUM> for RLF recovery.

In an example, each of the SCell trigger message <NUM>, the SCell trigger message <NUM>, the measurement message <NUM>, the measurement message <NUM>, the replacement message <NUM>, and the replacement message <NUM> may be transmitted in one or more of an RRC message, a MAC CE message, or a DCI message.

Referring to <FIG>, an example of a method <NUM> for performing recovery of SCG while in a dormant SCG state may be performed by the SCG dormancy management component <NUM>, the modem <NUM>, the processor <NUM>, and/or the memory <NUM> of the UE <NUM> of the wireless communication network <NUM>.

At block <NUM>, the method <NUM> may include determining the UE has entered a dormant state with respect to an SCG of an SN having a PSCell and one or more SCells. For example, the SCG dormancy management component <NUM>, the modem <NUM>, the processor <NUM>, and/or one or more additional components/subcomponents of the UE <NUM> may determine the UE <NUM> has entered a dormant SCG state <NUM> with respect to the SCG of the SN <NUM> having the PSCell and one or more SCells, as illustrated by <FIG>. In an example, determination of the dormant state may be based on a message from the SN <NUM> or a dormancy state setting (e.g., dormancy bit) indicating the dormancy state.

In certain implementations, the processor <NUM>, the modem <NUM>, the SCG dormancy management component <NUM>, and/or one or more other components or subcomponents of the UE <NUM> may be configured to and/or may define means for determining the UE has entered a dormant state with respect to an SCG of an SN having a PSCell and one or more SCells.

At block <NUM>, the method <NUM> may include monitoring the SCG to detect a radio link failure on the PSCell or a beam failure on one of the PSCell or an SCell of the one or more SCells, while the UE is in the dormant state with respect to the SCG. For example, the SCG dormancy management component <NUM>, the modem <NUM>, the processor <NUM>, and/or one or more other components or subcomponents of the UE <NUM> may perform the BFD procedure <NUM> of <FIG> or the RLF procedure <NUM> of <FIG> and <FIG> to monitor the SCG to detect the RLF <NUM> on the PSCell or the beam failure <NUM> on one of the PSCell or the SCell while the UE <NUM> is in the dormant SCG state <NUM> with respect to the SCG.

In certain implementations, the processor <NUM>, the modem <NUM>, the SCG dormancy management component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for monitoring the SCG to detect a radio link failure on the PSCell or a beam failure on one of the PSCell or an SCell of the one or more SCells, while the UE is in the dormant state with respect to the SCG.

At block <NUM>, the method <NUM> may include transmitting, to the SN, a report based on the radio link failure or the beam failure being detected. For example, the SCG dormancy management component <NUM>, the modem <NUM>, the processor <NUM>, the transceiver <NUM>, and/or one or more other components or subcomponents of the UE <NUM> may transmit, to the SN <NUM>, the RACH message <NUM> of <FIG>, the BFD message <NUM> of <FIG> and <FIG>, or the RLF message <NUM> of <FIG> and <FIG> including a report based on the beam failure <NUM> or the RLF <NUM> being detected.

In certain implementations, the processor <NUM>, the modem <NUM>, the SCG dormancy management component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for transmitting, to the SN, a report based on the radio link failure or the beam failure being detected.

In an example, the transmitting of the report may comprise transmitting, to the SN on the PSCell, an RACH message including the report in response to the beam failure being detected. The SCG dormancy management component <NUM>, the modem <NUM>, the processor <NUM>, and/or one or more other components or subcomponents of the UE <NUM> may transmit, to the SN <NUM> on the PSCell, the RACH message <NUM> of <FIG> including the report in response to the beam failure <NUM> being detected. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG dormancy management component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for transmitting, to the SN on the PSCell, an RACH message including the report in response to the beam failure being detected.

In an example, the method <NUM> may also include determining a best DL beam for the PSCell or the SCell of the SCG for communicating with the SN in response to the beam failure being detected on the PSCell or the SCell; and transmitting, to the SN, an indication of the DL beam for communication with the UE. In another example, the SCG dormancy management component <NUM>, the modem <NUM>, the processor <NUM>, and/or one or more other components or subcomponents of the UE <NUM> may determine a best DL beam <NUM> of <FIG> for the PSCell or the SCell of the SCG for communicating with the SN <NUM> in response to the beam failure <NUM> of <FIG> being detected on the PSCell or the SCell; and transmit, to the SN <NUM>, an indication (in the BFD message <NUM> of <FIG>) of the DL beam for communication with the UE <NUM>. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG dormancy management component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for determining a best DL beam for the PSCell or the SCell of the SCG for communicating with the SN in response to the beam failure being detected on the PSCell or the SCell; and transmitting, to the SN <NUM>, an indication of the DL beam for communication with the UE.

In an example, the method <NUM> may also include transmitting the report to an MN having an MCG along with instructions to forward the report to the SN. In another example, the SCG dormancy management component <NUM>, the modem <NUM>, the processor <NUM>, and/or one or more other components or subcomponents of the UE <NUM> may transmit the report (e.g., BFD message <NUM> of <FIG> and <FIG>, RLF message <NUM> of <FIG> and <FIG>) to MN <NUM> having the MCG along with instructions to forward the report to the SN <NUM>. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG dormancy management component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for transmitting the report to the MN <NUM> having the MCG along with instructions to forward the report to the SN.

In an example, the report may be transmitted via one of a RRC message, a MAC CE message, or a DCI message.

In an example, the method <NUM> may also include receiving, from the SN via the MN in response to the transmitting of the report, an indication of resources for a BFR procedure on the SCG. In another example, the SCG dormancy management component <NUM>, the modem <NUM>, the processor <NUM>, and/or one or more other components or subcomponents of the UE <NUM> may receive, from the SN <NUM> via the MN <NUM> in response to the transmitting of the report (e.g., BFD message <NUM> of <FIG> and <FIG>, RLF message <NUM> of <FIG> and <FIG>), an indication of resources (e.g., RACH resources) for a BFR procedure on the SCG. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG dormancy management component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for receiving, from the SN <NUM> via the MN <NUM> in response to the transmitting of the report, an indication of resources for a BFR procedure on the SCG.

In an example, the method <NUM> may also include communicating with the SN through a RACH message on the PSCell in response to the receiving of the indication of resources for the BFR procedure on the PSCell or the SCell of the SCG. In another example, the SCG dormancy management component <NUM>, the modem <NUM>, the processor <NUM>, and/or one or more other components or subcomponents of the UE <NUM> may communicate with the SN <NUM> through the RACH message (e.g., RACH message <NUM> of <FIG>, RACH message <NUM> of <FIG>) on the PSCell in response to the receiving of the indication of resources for the BFR procedure on the PSCell or the SCell of the SCG. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG dormancy management component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for communicating with the SN through an RACH message on the PSCell in response to the receiving of the indication of resources for the BFR procedure on the PSCell or the SCell of the SCG.

In an example, the method <NUM> may also include receiving, from the SN via the MN in response to the transmitting of the report, an indication that no BFR procedure on the SCG will be performed. In another example, the SCG dormancy management component <NUM>, the modem <NUM>, the processor <NUM>, and/or one or more other components or subcomponents of the UE <NUM> may receive, from the SN <NUM> via the MN <NUM> in response to the transmitting of the report, an indication that no BFR procedure (e.g., BFR message <NUM> of <FIG>) on the SCG will be performed. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG dormancy management component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for receiving, from the SN <NUM> via the MN <NUM> in response to the transmitting of the report, an indication that no BFR procedure on the SCG will be performed.

In an example, the method <NUM> may also include receiving, from the SN <NUM> via the MN <NUM> in response to the transmitting of the report, an indication for the UE <NUM> to remain in a RLF state on the PSCell. In another example, the SCG dormancy management component <NUM>, the modem <NUM>, the processor <NUM>, and/or one or more other components or subcomponents of the UE <NUM> may receive, from the SN <NUM> via the MN <NUM> in response to the transmitting of the report, an indication (e.g., no change message <NUM> of <FIG>) for the UE <NUM> to remain in a RLF state on the PSCell. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG dormancy management component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for receiving, from the SN <NUM> via the MN <NUM> in response to the transmitting of the report, an indication for the UE <NUM> to remain in a RLF state on the PSCell.

In an example, the method <NUM> may also include receiving, from the SN <NUM> via the MN <NUM> in response to the transmitting of the report, first instructions to perform one or more measurements on the one or more SCells of the SCG. In another example, the SCG dormancy management component <NUM>, the modem <NUM>, the processor <NUM>, and/or one or more other components or subcomponents of the UE <NUM> may receive, from the SN <NUM> via the MN <NUM> in response to the transmitting of the report, first instructions (e.g., SCell trigger message <NUM> of <FIG>) to perform one or more measurements on the one or more SCells of the SCG. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG dormancy management component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for receiving, from the SN <NUM> via the MN <NUM> in response to the transmitting of the report, first instructions to perform one or more measurements on the one or more SCells of the SCG.

In an example, the method <NUM> may also include performing the one or more measurements on the one or more SCells in response to receiving of the instructions; and transmitting, to the SN <NUM> via the MN <NUM>, a measurement report. In another example, the SCG dormancy management component <NUM>, the modem <NUM>, the processor <NUM>, and/or one or more other components or subcomponents of the UE <NUM> may perform the one or more measurements <NUM> on the one or more SCells in response to receiving of the first instructions; and transmit, to the SN <NUM> via the MN <NUM>, a measurement report (e.g., measurement message <NUM>). In certain implementations, the processor <NUM>, the modem <NUM>, the SCG dormancy management component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for performing the one or more measurements on the one or more SCells in response to receiving of the instructions; and transmitting, to the SN <NUM> via the MN <NUM>, a measurement report.

In an example, the method <NUM> may also include receiving, from the SN <NUM> via the MN <NUM>, second instructions to update the PSCell to a selected SCell of the one or more SCells in response to the transmitting of the measurement report. In another example, the SCG dormancy management component <NUM>, the modem <NUM>, the processor <NUM>, and/or one or more other components or subcomponents of the UE <NUM> may receive, from the SN <NUM> via the MN <NUM>, second instructions (e.g., replacement message <NUM>) to update the PSCell to a selected SCell of the one or more SCells in response to the transmitting of the measurement report. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG dormancy management component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for receiving, from the SN <NUM> via the MN <NUM>, second instructions to update the PSCell to a selected SCell of the one or more SCells in response to the transmitting of the measurement report.

In an example, the method <NUM> may also include transmitting an RACH message on the selected SCell. In another example, the SCG dormancy management component <NUM>, the modem <NUM>, the processor <NUM>, and/or one or more other components or subcomponents of the UE <NUM> may transmit the RACH message <NUM> on the new PSCell which is the selected SCell. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG dormancy management component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for transmitting an RACH message on the selected SCell.

Referring to <FIG>, an example of a method <NUM> for performing a recovery procedure during a dormant SCG state may be performed by the SCG recovery component <NUM>, the modem <NUM>, the processor <NUM>, the memory <NUM>, and/or one or more additional components/subcomponents of the base station <NUM> in the wireless communication network <NUM>.

At block <NUM>, the method <NUM> may include receiving, from the UE, a report based on a radio link failure being detected on the PSCell or a beam failure being detected on one of the PSCell or an SCell of one or more SCells of the SCG, in response to the UE being in a dormant state with respect to the SCG. For example, the SCG recovery component <NUM>, the modem <NUM>, the processor <NUM>, the memory <NUM>, and/or one or more components/subcomponents of the base station <NUM> may receive, from the UE <NUM>, a report (e.g., RACH message <NUM> of <FIG>, BFD message <NUM> of <FIG> and <FIG>, RLF message <NUM> of <FIG> and <FIG>) based on a RLF being detected (e.g., RLF <NUM> of <FIG> and <FIG>) on the PSCell or the beam failure (e.g., BFD <NUM> of <FIG>) on the PSCell or an SCell, in response to the UE <NUM> being in a dormant state with respect to the SCG.

In certain implementations, the processor <NUM>, the modem <NUM>, the SCG recovery component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for receiving, from the UE, a report based on a radio link failure being detected on the PSCell or a beam failure being detected on one of the PSCell or an SCell of one or more SCells of the SCG, in response to the UE being in a dormant state with respect to the SCG.

In some examples, the report may be received in an RACH message on the PSCell. In some examples, the report may include an indication of a best DL beam for the PSCell or the SCell of the SCG for communicating with the UE in response to the beam failure being detected on the PSCell or the SCell. The indication may include an identification of the DL beam for the PSCell or the SCell. In some examples, the report may be received from an MN having an MCG. In some examples, the report may be received via one of an RRC message, an MAC CE message, or a DCI message.

At block <NUM>, the method <NUM> may include determining to perform a recovery procedure with the UE or to not perform the recovery procedure in response to the report. For example, the SCG recovery component <NUM>, the modem <NUM>, and/or the processor <NUM> of the base station <NUM> may determine (e.g., BFR decision <NUM> of <FIG> and <FIG>, RLF decision <NUM> of <FIG> and <FIG>) to perform a recovery procedure with the UE <NUM> or to not perform the recovery procedure in response to the report.

In certain implementations, the processor <NUM>, the modem <NUM>, the SCG recovery component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for determining to perform a recovery procedure with the UE or to not perform the recovery procedure in response to the report.

At block <NUM>, the method <NUM> may include transmitting, to the UE, an indication that the recovery procedure will be performed or to not performed. For example, the SCG recovery component <NUM>, the modem <NUM>, and/or the processor <NUM> of the base station <NUM> may transmit, to the UE <NUM>, an indication (e.g., BFR message <NUM> or <NUM> of <FIG> and <FIG>, no change message <NUM> or SCell trigger message <NUM> of <FIG> and <FIG>) that the recovery procedure will be performed or to not performed.

In an example, the method <NUM> may also include transmitting, to the UE via the MN in response to the receiving of the report, an indication of resources for the recovery procedure on the SCG, wherein the recovery procedure is a BFR procedure, and wherein the report includes an indication of the beam failure being detected on the PSCell or the SCell. For example, the SCG recovery component <NUM>, the modem <NUM>, and/or the processor <NUM> of the base station <NUM> may transmit, to the UE <NUM> via the MN <NUM> in response to the receiving of the report, an indication of resources for the recovery procedure on the SCG, wherein the recovery procedure is a BFR procedure, and wherein the report includes an indication of the beam failure being detected on the PSCell or the SCell. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG recovery component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for transmitting, to the UE <NUM> via the MN <NUM> in response to the receiving of the report, an indication of resources for the recovery procedure on the SCG, wherein the recovery procedure is a BFR procedure, and wherein the report includes an indication of the beam failure being detected on the PSCell or the SCell.

In an example, the method <NUM> may also include communicating with the UE through an RACH message on the PSCell in response to the transmitting of the indication of resources for the BFR procedure on the SCG. For example, the SCG recovery component <NUM>, the modem <NUM>, and/or the processor <NUM> of the base station <NUM> may communicate with the UE through an RACH message on the PSCell in response to the transmitting of the indication of resources for the BFR procedure on the SCG. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG recovery component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for communicating with the UE through an RACH message on the PSCell in response to the transmitting of the indication of resources for the BFR procedure on the SCG.

In an example, the method <NUM> may also include transmitting, to the UE via the MN in response to the receiving of the report, the indication that the recovery procedure will not be performed, wherein the recovery procedure is a BFR procedure on the SCG, wherein the report includes an indication of the beam failure being detected on the PSCell or the SCell. For example, the SCG recovery component <NUM>, the modem <NUM>, and/or the processor <NUM> of the base station <NUM> may transmit, to the UE <NUM> via the MN <NUM> in response to the receiving of the report, the indication that the recovery procedure will not be performed, wherein the recovery procedure is a BFR procedure on the SCG, wherein the report includes an indication of the beam failure being detected on the PSCell or the SCell. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG recovery component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for transmitting, to the UE <NUM> via the MN <NUM> in response to the receiving of the report, the indication that the recovery procedure will not be performed, wherein the recovery procedure is a BFR procedure on the SCG, wherein the report includes an indication of the beam failure being detected on the PSCell or the SCell.

In an example, the method <NUM> may also include transmitting, to the UE via the MN, the indication that the recovery procedure will not be performed, in response to the receiving of the report, wherein the recovery procedure is a radio link recovery procedure on the SCG, wherein the report includes an indication of the radio link failure being detected. For example, the SCG recovery component <NUM>, the modem <NUM>, and/or the processor <NUM> of the base station <NUM> may transmit, to the UE <NUM> via the MN <NUM>, the indication that the recovery procedure will not be performed, in response to the receiving of the report, wherein the recovery procedure is a radio link recovery procedure on the SCG, wherein the report includes an indication of the radio link failure being detected. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG recovery component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for transmitting, to the UE <NUM> via the MN <NUM>, the indication that the recovery procedure will not be performed, in response to the receiving of the report, wherein the recovery procedure is a radio link recovery procedure on the SCG, wherein the report includes an indication of the radio link failure being detected.

In an example, the method <NUM> may also include transmitting, to the UE via the MN, first instructions to perform one or more measurements on the one or more SCells of the SCG in response to the receiving of the report, wherein the report includes an indication of the radio link failure being detected. For example, the SCG recovery component <NUM>, the modem <NUM>, and/or the processor <NUM> of the base station <NUM> may transmit, to the UE <NUM> via the MN <NUM>, first instructions to perform one or more measurements on the one or more SCells of the SCG in response to the receiving of the report, wherein the report includes an indication of the radio link failure being detected. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG recovery component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for transmitting, to the UE <NUM> via the MN <NUM>, first instructions to perform one or more measurements on the one or more SCells of the SCG in response to the receiving of the report, wherein the report includes an indication of the radio link failure being detected.

In an example, the method <NUM> may also include receiving, from the UE via the MN, a measurement report in response to the transmitting of the first instructions. For example, the SCG recovery component <NUM>, the modem <NUM>, and/or the processor <NUM> of the base station <NUM> may receive, from the UE <NUM> via the MN <NUM>, a measurement report in response to the transmitting of the first instructions. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG recovery component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for receiving, from the UE <NUM> via the MN <NUM>, a measurement report in response to the transmitting of the first instructions.

In an example, the method <NUM> may also include transmitting, to the UE via the MN, second instructions to update the PSCell to a selected SCell of the one or more SCells in response to the receiving of the measurement report. For example, the SCG recovery component <NUM>, the modem <NUM>, and/or the processor <NUM> of the base station <NUM> may transmit, to the UE <NUM> via the MN <NUM>, second instructions to update the PSCell to a selected SCell of the one or more SCells in response to the receiving of the measurement report. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG recovery component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for transmitting, to the UE <NUM> via the MN <NUM>, second instructions to update the PSCell to a selected SCell of the one or more SCells in response to the receiving of the measurement report.

In an example, the method <NUM> may also include receiving, from the UE, an RACH message on the selected SCell. For example, the SCG recovery component <NUM>, the modem <NUM>, and/or the processor <NUM> of the base station <NUM> may receive, from the UE <NUM>, an RACH message on the selected SCell. In certain implementations, the processor <NUM>, the modem <NUM>, the SCG recovery component <NUM>, the transceiver <NUM>, the receiver <NUM>, the transmitter <NUM>, the RF front end <NUM>, and/or the subcomponents of the RF front end <NUM> may be configured to and/or may define means for receiving, from the UE <NUM>, an RACH message on the selected SCell.

An example method of wireless communication by a UE, comprising: determining the UE has entered a dormant state with respect to an SCG of an SN having a PSCell and one or more SCells; monitoring the SCG to detect a radio link failure on the PSCell or a beam failure on one of the PSCell or an SCell of the one or more SCells, while the UE is in the dormant state with respect to the SCG; and transmitting, to the SN, a report based on the radio link failure or the beam failure being detected.

The above example method wherein the report includes an indication of the beam failure being detected, and wherein the transmitting of the report comprises transmitting, to the SN on the PSCell, an RACH message including the report in response to the beam failure being detected.

One or more of the above example methods further comprising: determining a best DL beam for the PSCell or the SCell of the SCG for communicating with the SN in response to the beam failure being detected on the PSCell or the SCell; and transmitting, to the SN, an indication of the DL beam for communication with the UE.

One or more of the above example methods wherein the transmitting of the report comprises transmitting the report to an MN having an MCG along with instructions to forward the report to the SN.

One or more of the above example methods wherein the transmitting the report to the MN comprises transmitting the report via one of an RRC message, an MAC CE message, or a DCI message.

One or more of the above example methods wherein the report includes an indication of the beam failure being detected on the PSCell or the SCell, and wherein the method further comprises receiving, from the SN via the MN in response to the transmitting of the report, an indication of resources for a BFR procedure on the SCG.

One or more of the above example methods further comprising: communicating with the SN through an RACH message on the PSCell in response to the receiving of the indication of resources for the BFR procedure on the PSCell or the SCell of the SCG.

One or more of the above example methods wherein the report includes an indication of the beam failure being detected on the PSCell or the SCell, and wherein the method further comprises receiving, from the SN via the MN in response to the transmitting of the report, an indication that no BFR procedure on the SCG will be performed.

One or more of the above example methods wherein the report includes an indication of the radio link failure being detected, and wherein the method further comprises receiving, from the SN via the MN in response to the transmitting of the report, an indication for the UE to remain in a radio link failure state on the PSCell.

One or more of the above example methods wherein the report includes an indication of the radio link failure being detected, and wherein the method further comprises receiving, from the SN via the MN in response to the transmitting of the report, first instructions to perform one or more measurements on the one or more SCells of the SCG.

One or more of the above example methods further comprising: performing the one or more measurements on the one or more SCells in response to receiving of the first instructions; and transmitting, to the SN via the MN, a measurement report.

One or more of the above example methods further comprising: receiving, from the SN via the MN, second instructions to update the PSCell to a selected SCell of the one or more SCells in response to the transmitting of the measurement report.

One or more of the above example methods further comprising: transmitting an RACH message on the selected SCell.

An example apparatus, comprising: a memory comprising instructions; and one or more processors communicatively coupled with the memory and configured to: perform all or a part of any of the above example methods.

An example computer readable medium having instructions stored therein that, when executed by one or more processors, cause the one or more processors to: perform all or a part of any of the above example methods.

An example apparatus, comprising: means for performing all or a part of any of the above example methods.

A second example method of wireless communication by an apparatus of a PSCell associated with an SCG, the method comprising: receiving, from the UE, a report based on a radio link failure being detected on the PSCell or a beam failure being detected on one of the PSCell or an SCell of one or more SCells of the SCG, in response to the UE being in a dormant state with respect to the SCG; determining to perform a recovery procedure with the UE or to not perform the recovery procedure in response to the report; and transmitting, to the UE, an indication that the recovery procedure will be performed or not performed.

The above second example method wherein the receiving of the report comprises receiving the report in an RACH message on the PSCell.

One or more of the above second example methods wherein the receiving of the report comprises an indication of a best DL beam for the PSCell or the SCell of the SCG for communicating with the UE in response to the beam failure being detected on the PSCell or the SCell.

One or more of the above second example methods wherein the receiving of the report comprises receiving the report from an MN having an MCG.

One or more of the above second example methods wherein the receiving the report from the MN comprises receiving the report via one of an RRC message, an MAC CE message, or a DCI message.

One or more of the above second example methods wherein the report includes an indication of the beam failure being detected on the PSCell or the SCell, and wherein the method further comprises transmitting, to the UE via the MN in response to the receiving of the report, an indication of resources for the recovery procedure on the SCG, and wherein the recovery procedure is a BFR procedure.

One or more of the above second example methods further comprising: communicating with the UE through an RACH message on the PSCell in response to the transmitting of the indication of resources for the BFR procedure on the SCG.

One or more of the above second example methods wherein the report includes an indication of the beam failure being detected on the PSCell or the SCell, and wherein the method further comprises transmitting, to the UE via the MN in response to the receiving of the report, the indication that the recovery procedure will not be performed, wherein the recovery procedure is a BFR procedure on the SCG.

One or more of the above second example methods wherein the report includes an indication of the radio link failure being detected, and wherein the method further comprises transmitting, to the UE via the MN, the indication that the recovery procedure will not be performed, in response to the receiving of the report, wherein the recovery procedure is a radio link recovery procedure on the SCG.

One or more of the above second example methods wherein the report includes an indication of the radio link failure being detected, and wherein the method further comprises transmitting, to the UE via the MN, first instructions to perform one or more measurements on the one or more SCells of the SCG in response to the receiving of the report.

One or more of the above second example methods further comprising: receiving, from the UE via the MN, a measurement report in response to the transmitting of the first instructions.

One or more of the above second example methods further comprising: transmitting, to the UE via the MN, second instructions to update the PSCell to a selected SCell of the one or more SCells in response to the receiving of the measurement report.

One or more of the above second example methods further comprising: receiving, from the UE, an RACH message on the selected SCell.

An example apparatus, comprising: a memory comprising instructions; and one or more processors communicatively coupled with the memory and configured to: perform all or a part of any of the above second example methods.

An example computer readable medium having instructions stored therein that, when executed by one or more processors, cause the one or more processors to: perform all or a part of any of the above second example methods.

An example apparatus, comprising: means for performing all or a part of any of the above second example methods.

For example, changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Also, various examples may omit, substitute, or add various procedures or components as appropriate.

It should be noted that the techniques described herein may be used for various wireless communication networks such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, and other systems. The terms "system" and "network" are often used interchangeably. IS-<NUM> Releases <NUM> and A are commonly referred to as CDMA2000 1X, 1X, etc. IS-<NUM> (TIA-<NUM>) is commonly referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. An OFDMA system may implement a radio technology such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), IEEE <NUM> (Wi-Fi), IEEE <NUM> (WiMAX), IEEE <NUM>, Flash-OFDM™, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS). 3GPP LTE and LTE-Advanced (LTE-A) are new releases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). The techniques described herein may be used for the systems and radio technologies mentioned above as well as other systems and radio technologies, including cellular (e.g., LTE) communications over a shared radio frequency spectrum band. The description herein, however, describes an LTE/LTE-A system or <NUM> system for purposes of example, and LTE terminology is used in much of the description below, although the techniques may be applicable other next generation communication systems.

For example, due to the nature of software, functions described above may be implemented using software executed by a specially programmed processor, hardware, firmware, hardwiring, or combinations of any of these.

A storage medium may be any available medium that may be accessed by a general purpose or special purpose computer. By way of example, and not limitation, computer-readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.

Claim 1:
A method (<NUM>) of wireless communication at a user equipment, UE, comprising:
determining (<NUM>) the UE has entered a dormant state with respect to a secondary cell group, SCG, of a secondary node, SN, having a primary SCG cell, PSCell, and one or more secondary cells, SCells; characterised by:
monitoring (<NUM>), while the UE is in the dormant state with respect to the SCG, to detect a radio link failure on the SCG or a beam failure on one of the PSCell or an SCell of the one or more SCells; and
transmitting (<NUM>), to the SN, a report based on the radio link failure being detected or the beam failure being detected.