Activating a secondary cell group using a user equipment configured for dual connectivity with multiple radio access technologies

Abstract

Various aspects of the disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) can detect a radio link failure on a primary cell group. Accordingly, the UE can determine a status of a secondary cell group (SCG). Additionally, the UE can initiate activation of the SCG based at least in part on the status of the SCG. For example, the activation of the SCG can be initiated based at least in part on the status being a deactivated state, a dormant state, or an enhanced dormant state. Accordingly, the UE can transmit master cell group (MCG) failure recovery information on the SCG and receive MCG reconnection information on the SCG. Numerous other aspects are provided.

Description

[0001] Cross-references to related applications

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 63 / 047,197, filed July 1, 2020, entitled “ACTIVATION OF ASECONDARY CELL GROUP USING USER EQUIPMENT CONFIGURED FOR DUAL CONNECTIVITY WITH MULTIPLE RADIO ACCESS TECHNOLOGIES”, and U.S. Non-Provisional Patent Application No. 17 / 328,222, filed May 24, 2021, entitled “ACTIVATION OF A SECONDARY CELL GROUP USING A USER EQUIPMENT CONFIGURED FOR DUAL CONNECTIVITY WITH MULTIPLE RADIO ACCESS TECHNOLOGIES”, which are expressly incorporated herein by reference. Technical Field

[0003] This disclosure relates generally to wireless communications, and specifically to techniques and apparatus for activating secondary cell groups using user equipment configured to utilize dual connectivity with multiple radio access technologies. Background Technology

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunications services, such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems 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 these 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 / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard released by the 3rd Generation Partnership Project (3GPP).

[0005] A wireless network may include multiple base stations (BSs) capable of supporting communication between multiple user equipments (UEs). UEs can communicate with the BS via downlinks and uplinks. A "downlink" (or forward link) refers to the communication link from the BS to the UE, while an "uplink" (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, Access Point (AP), Radio Headend, Transmitter-Receiver Point (TRP), New Radio (NR) BS, 5G Node B, etc.

[0006] The above multiple access technologies have been adopted in various telecommunications standards to provide a common protocol that enables different user equipment to communicate at the city, country, region, and even global levels. NR (also known as 5G) is a set of enhancements to the LTE mobile standard released by 3GPP. NR is designed to better support mobile broadband internet access by improving spectrum efficiency, reducing costs, improving service, utilizing new spectrum, and better integrating with other open standards by using Orthogonal Frequency Division Multiplexing (OFDM) with a Cyclic Prefix (CP) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also known as Discrete Fourier Transform Extended OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, multiple-input multiple-output (MIMO) antenna technologies and carrier aggregation. Further improvements to LTE, NR, and other radio access technologies remain useful as the demand for mobile broadband access continues to increase. Summary of the Invention

[0007] In some aspects, a method for performing wireless communication by a user equipment (UE) includes: detecting a radio link failure (RLF) on a primary cell group (MCG); determining the state of a secondary cell group (SCG); and initiating activation of the SCG by the UE based at least in part on the state of the SCG.

[0008] In some aspects, a method for performing wireless communication by a base station within an SCG includes: receiving from a UE a message for initiating activation of the SCG, wherein when the base station receives the message, the SCG is in a deactivated state, a dormant state, or an enhanced dormant state, and the UE has detected an RLF with the MCG; and sending timing advance (TA) information to the UE, at least in part based on the receipt of the message.

[0009] In some aspects, a UE for wireless communication includes: a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to: detect an RLF on an MCG; determine the state of an SCG; and initiate activation of an SCG at least in part based on the state of the SCG.

[0010] In some aspects, a base station within an SCG for wireless communication includes: a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to: receive from a UE a message for initiating activation of the SCG, wherein when the base station receives the message, the SCG is in a deactivated state, a dormant state, or an enhanced dormant state, and the UE has detected an RLF with the MCG; and send TA information to the UE, at least in part based on the receipt of the message.

[0011] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of the UE, cause the UE to: detect an RLF on the MCG; determine the state of the SCG; and initiate activation of the SCG, at least in part based on the state of the SCG.

[0012] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a base station within an SCG, cause the base station to: receive from a UE a message for initiating activation of the SCG, wherein when the base station receives the message, the SCG is in a deactivated state, a dormant state, or an enhanced dormant state, and the UE has detected an RLF with the MCG; and, at least in part based on the receipt of the message, send TA information to the UE.

[0013] In some aspects, an apparatus for wireless communication includes: a unit for detecting an RLF on an MCG; a unit for determining the state of an SCG; and a unit for initiating activation of the SCG at least in part based on the state of the SCG.

[0014] In some aspects, an apparatus within an SCG for wireless communication includes: a unit for receiving from a UE a message for initiating activation of the SCG, wherein when the apparatus receives the message, the SCG is in a deactivated state, a dormant state, or an enhanced dormant state, and the UE has detected an RLF with the MCG; and a unit for sending TA information to the UE, at least in part, based on the receipt of the message.

[0015] The aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication equipment and / or processing systems as described herein with reference to the accompanying drawings and description.

[0016] The features and technical advantages of examples according to this disclosure have been outlined quite extensively above to facilitate a better understanding of the detailed description that follows. Other features and advantages will be described below. The disclosed concepts and specific examples can be readily used as the basis for modifying or designing other structures for achieving the same purpose as this disclosure. Such equivalent structures do not depart from the scope of the appended claims. The features of the concepts disclosed herein (both their organization and manner of operation) and their associated advantages will be better understood from the following description when considered in conjunction with the accompanying drawings. Each drawing is provided for illustrative and descriptive purposes and not as a limitation of the definitions in the claims.

[0017] While aspects have been described in this disclosure by way of example, those skilled in the art will understand that these aspects can be implemented in many different arrangements and scenarios. The techniques described herein can be implemented using different platform types, devices, systems, shapes, sizes, and / or package arrangements. For example, some aspects can be implemented via integrated chip embodiments or other devices based on non-modular components (e.g., end-user equipment, vehicles, communication equipment, computing devices, industrial equipment, retail / purchasing devices, medical devices, or AI-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 may include additional components and features for implementing and practicing the claimed and described aspects. For example, the transmission and reception of wireless signals may include multiple components for analog and digital purposes (e.g., hardware components including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders, or summers). It is intended that the aspects described herein can be practiced in a variety of devices, components, systems, distributed arrangements, or end-user equipment of different sizes, shapes, and configurations. Attached Figure Description

[0018] To gain a more detailed understanding of the features described above in this disclosure, a more specific description of the brief overview can be obtained by referring to some of the aspects shown in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and should therefore not be considered as limiting its scope, as other equivalent aspects may be permitted in this specification. The same reference numerals in different drawings may identify the same or similar elements.

[0019] Figure 1 This is a diagram illustrating an example of a wireless network according to this disclosure.

[0020] Figure 2 This is a diagram illustrating an example of communication between a base station and a user equipment (UE) in a wireless network according to this disclosure.

[0021] Figure 3A This is a diagram illustrating an example of a UE configured for multiple RAT dual connectivity (MR-DC) with a primary cell group (MCG) and a secondary cell group (SCG) in accordance with this disclosure.

[0022] Figure 3B This is a diagram illustrating an example of the SCG status of a UE according to this disclosure.

[0023] Figure 4 This is a diagram illustrating an example of a two-step random access process according to this disclosure.

[0024] Figure 5 This is a diagram illustrating an example of a four-step random access process according to this disclosure.

[0025] Figure 6 This is a diagram illustrating an example of SCG activation for MR-DC according to this disclosure.

[0026] Figure 7 This is a diagram illustrating an example of SCG activation associated with MCG radio link failure (RLF) recovery, according to this disclosure.

[0027] Figure 8 This is a diagram illustrating an example of concurrent SCG data transmission associated with MCG RLF recovery according to this disclosure.

[0028] Figure 9 This is a diagram illustrating an example process performed by a UE according to this disclosure.

[0029] Figure 10 This is a diagram illustrating an example process performed by a base station according to this disclosure. Detailed Implementation

[0030] Various aspects of this disclosure are described more fully below with reference to the accompanying drawings. However, this disclosure may be embodied in many different forms and should not be construed as limited to any specific structure or function given throughout this disclosure. Rather, these aspects are provided to make this disclosure thorough and complete, and to fully convey the scope of this disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will understand that the scope of this disclosure is intended to cover any aspect of this disclosure, whether implemented independently of or in combination with any other aspect of this disclosure. For example, any number of aspects set forth herein may be used to implement an apparatus or method of practice. Furthermore, the scope of this disclosure is intended to cover such apparatus or methods practiced using other structures, functions, or structures and functions that complement or replace the various aspects of this disclosure set forth herein. It should be understood that any aspect of the disclosure herein may be embodied by one or more elements of the claims.

[0031] Several aspects of a telecommunications system will now be presented with reference to various devices and technologies. These devices and technologies will be described in detail below and illustrated in the accompanying drawings by various boxes, modules, components, circuits, steps, processes, algorithms, etc. (collectively, “elements”). These elements can be implemented using hardware, software, or a combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the system as a whole.

[0032] It should be noted that although the terms commonly associated with 5G or NR radio access technology (RAT) are used in this document to describe the aspects, the aspects of this disclosure may be applied to other RATs, such as 3G RAT, 4G RAT and / or RATs after 5G (e.g., 6G).

[0033] Figure 1 This is a diagram illustrating an example of a wireless network 100 according to this disclosure. Wireless network 100 may be or may include elements of a 5G (NR) network and / or an LTE network, etc. Wireless network 100 may include multiple base stations 110 (shown as BS110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with user equipment (UE) and may also be referred to as an NR BS, Node B, gNB, 5G Node B (NB), access point, Transmitter Receiver Point (TRP), etc. Each BS may provide communication coverage for a specific 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.

[0034] A BS can provide communication coverage for macrocells, picocells, femtocells, and / or other cell types. A macrocell can cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access for UEs with service subscriptions. A picocell can cover a smaller geographic area and can allow unrestricted access for UEs with service subscriptions. A femtocell can cover a smaller geographic area (e.g., a home) and can allow restricted access for UEs associated with the femtocell (e.g., UEs in a Closed User Group (CSG)). A BS used for macrocells can be referred to as a BS. A BS used for picocells can be referred to as a pico BS. A BS used for femtocells can be referred to as a femto BS or a home BS. Figure 1 In the example shown, BS 110a can be a macro BS for macro cell 102a, BS 110b can be a pico BS for pico cell 102b, and BS 110c can be a femto BS for femto cell 102c. A BS can support one or more (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “Node B,” “5G NB,” and “cell” are used interchangeably herein.

[0035] In some respects, the cell may not necessarily be stationary, and the geographical area of ​​the cell may move depending on the location of the mobile BS. In some respects, BSs may interconnect with each other and / or interconnect to one or more other BSs or network nodes (not shown) in the wireless network 100 using any suitable transport network via various types of backhaul interfaces such as direct physical connections or virtual networks.

[0036] The wireless network 100 may also include a relay station. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and transmit the data transmissions to a downstream station (e.g., a UE or a BS). A relay station can also be a UE that can relay transmissions used by other UEs. Figure 1 In the example shown, relay BS 110d can communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay BS can also be called a relay station, relay base station, relay, etc.

[0037] Wireless network 100 can be a heterogeneous network comprising different types of Base Stations (BSs) (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs can have different transmit power levels, different coverage areas, and different effects on interference in wireless network 100. For example, macro BSs can have high transmit power levels (e.g., 5 to 40 watts), while pico BSs, femto BSs, and relay BSs can have lower transmit power levels (e.g., 0.1 to 2 watts).

[0038] Network controller 130 can be coupled to a group of base stations (BSs) and provide coordination and control for these BSs. Network controller 130 can communicate with the BSs via backhaul. The BSs can also communicate with each other directly or indirectly, for example, via wireless or wired backhaul.

[0039] UE 120 (e.g., 120a, 120b, 120c) may be distributed throughout the wireless network 100, and each UE may be stationary or mobile. UE may also be referred to as an access terminal, terminal, mobile station, user unit, station, etc. UE may be a cellular phone (e.g., a smartphone), personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet computer, camera, gaming device, netbook, smartbook, ultrabook, medical device or apparatus, biometric sensor / device, wearable device (smartwatch, smart clothing, smart glasses, smart bracelet, smart jewelry (e.g., smart ring, smart bangle, etc.), entertainment device (e.g., music or video device, satellite radio, etc.), vehicle component or sensor, smart meter / sensor, industrial manufacturing equipment, GPS device, or any other suitable device configured to communicate via wireless or wired media.

[0040] Some UEs can 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 that can communicate with a base station, another device (e.g., a remote device), or some other entity. Wireless nodes can provide connectivity to or from a network (e.g., a wide area network such as the Internet or a cellular network) via wired or wireless communication links. Some UEs can be considered Internet of Things (IoT) devices and / or can be implemented as NB-IoT (Narrowband Internet of Things) devices. Some UEs can be considered Customer Premises Equipment (CPE). UE 120 can be included within a housing that houses the components of UE 120, such as processor components and / or memory components. In some aspects, the processor components and memory components can be coupled together. For example, processor components (e.g., one or more processors) and memory components (e.g., memory) can be operatively coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0041] Typically, any number of wireless networks can be deployed in a given geographical area. Each wireless network can support a specific RAT and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, air interface, etc. A frequency can also be referred to as a carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographical area to avoid interference between wireless networks using different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0042] 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 base station 110 as an intermediary device). For example, UE 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, etc.), and / or mesh networks. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere in this document that are performed by base station 110.

[0043] Devices in 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 in the wireless network 100 can communicate using an operating band with a first frequency range (FR1), which can span from 410 MHz to 7.125 GHz, and / or can communicate using an operating band with a second frequency range (FR2), which can span from 24.25 GHz to 52.6 GHz. The frequencies between FR1 and FR2 are sometimes referred to as intermediate frequency (IF) frequencies. 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 this differs from the extremely high frequency (EHF) band (30 GHz–300 GHz) designated as "millimeter wave" by the International Telecommunication Union (ITU). Therefore, unless otherwise specified, it should be understood that the terms "sub-6GHz," if used herein, can broadly refer to frequencies less than 6GHz, frequencies within FR1, and / or intermediate band frequencies (e.g., greater than 7.125GHz). Similarly, unless otherwise specified, it should be understood that the terms "millimeter wave," if used herein, can broadly refer to frequencies within the EHF band, frequencies within FR2, and / or intermediate band frequencies (e.g., less than 24.25GHz). It is conceivable that the frequencies included in FR1 and FR2 can be modified, and the techniques described herein can be applied to those modified frequency ranges.

[0044] As mentioned above, providing Figure 1 As an example. Other examples can be related to... Figure 1 The examples described are different.

[0045] Figure 2 This is a diagram illustrating an example 200 of communication between a base station 110 and a UE 120 in a wireless network 100 according to the present disclosure. The base station 110 may be equipped with T antennas 234a to 234t, and the UE 120 may be equipped with R antennas 252a to 252r, wherein typically T ≥ 1 and R ≥ 1.

[0046] At base station 110, transmit processor 220 can receive data from data source 212 of one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQI) received from the UE, process (e.g., code and modulate) the data for each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs. Transmit processor 220 can 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 can also generate reference symbols for reference signals (e.g., cell-specific reference signal (CRS) or demodulation reference signal (DMRS)) and synchronization signals (e.g., primary synchronization signal (PSS) or secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding, if applicable) on data symbols, control symbols, overhead symbols, and reference symbols, and can provide T output symbol streams to T modulators (MODs) 232a to 232t. Each modulator 232 can process its corresponding output symbol stream (e.g., for OFDM) to obtain an output sample stream. Each modulator 232 can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t can be transmitted via T antennas 234a to 234t respectively.

[0047] At UE 120, antennas 252a to 252r can receive downlink signals from base station 110 and / or other base stations, and can provide the received signals to demodulators (DEMODs) 254a to 254r respectively. Each demodulator 254 can adjust (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain an input sample. Each demodulator 254 can further process the input sample (e.g., for OFDM) to obtain a received symbol. MIMO detector 256 can obtain the received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols (if applicable), and provide the detected symbols. Receive processor 258 can process (e.g., demodulate and decode) the detected symbols, provide the decoded data of UE 120 to data sink 260, and provide the decoded control information and system information to controller / processor 280. The term "controller / processor" can refer to one or more controllers, one or more processors, or a combination thereof. The channel processor can determine parameters such as the Received Reference Signal Power (RSRP), Received Signal Strength Indicator (RSSI), Received Reference Signal Quality (RSRQ), and / or CQI. In some aspects, one or more components of the UE120 may be included in the housing 284.

[0048] Network controller 130 may include communication unit 294, controller / processor 290, and memory 292. Network controller 130 may include one or more devices, such as those in a core network. Network controller 130 may communicate with base station 110 via communication unit 294.

[0049] Antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include one or more antenna panels, antenna groups, antenna element sets, and / or antenna arrays, or may be included in one or more antenna panels, antenna groups, antenna element sets, and / or antenna arrays. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include one or more antenna elements. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include coplanar antenna element sets and / or non-coplanar antenna element sets. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include antenna elements within a single housing and / or antenna elements within multiple housings. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include antenna elements coupled to one or more transmitting and / or receiving components (e.g., Figure 2 One or more antenna elements (one or more components).

[0050] On the uplink, at UE 120, transmit processor 264 can receive and process data from data source 262 and control information from controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, and / or CQI). Transmit processor 264 can also generate reference symbols for one or more reference signals. Symbols from transmit processor 264 can be pre-encoded (if applicable) by TX MIMO processor 266, further processed by demodulators 252a to 254r (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to base station 110. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 254) of UE 120 can be included in the modem of UE 120. In some aspects, UE 120 includes a transceiver. The transceiver may include any combination of antenna 252, modulator and / or demodulator 254, MIMO detector 256, receiver processor 258, transmitter processor 264, and / or TX MIMO processor 266. The transceiver may be used by a processor (e.g., controller / processor 280) and memory 282 to perform the functions described herein (e.g., references). Figure 7-10 ( ) any aspect of the methods described.

[0051] At base station 110, uplink signals from UE 120 and other UEs can be received by antenna 234, processed by demodulator 232, detected by MIMO detector 236 (if applicable), and further processed by receiver processor 238 to obtain decoded data and control information transmitted by UE 120. Receiver processor 238 can provide the decoded data to data sink 239 and the decoded control information to controller / processor 240. Base station 110 may include communication unit 244 and communicate with network controller 130 via communication unit 244. Base station 110 may include scheduler 246 to schedule UE 120 for downlink and / or uplink communications. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 232) of base station 110 may be included in the modem of base station 110. In some aspects, base station 110 includes a transceiver. The transceiver may include any combination of antenna 234, modulator and / or demodulator 232, MIMO detector 236, receiver processor 238, transmitter processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform the functions described herein (e.g., references). Figure 7-10 ( ) any aspect of the methods described.

[0052] The controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component may perform one or more techniques associated with activating a secondary cell group (SCG) using a UE configured for multi-RAT dual connectivity (MR-DC), as described in more detail elsewhere in this document. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component can execute or direct, for example Figure 9 The process 900 Figure 10 The operation of process 1000 and / or other processes described herein. Memory 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 executed by one or more processors of base station 110 and / or UE 120 (e.g., directly, or after compilation, transformation, parsing), the one or more instructions may cause one or more processors, UE 120 and / or base station 110 to perform or direct, for example... Figure 9 The process 900 Figure 10 The process 1000, and / or other processes as described herein. In some aspects, the execution instructions may include: run instructions, conversion instructions, compilation instructions, interpretation instructions, etc.

[0053] In some aspects, the UE (e.g., UE 120) may include: a unit for detecting radio link failure (RLF) on the primary cell group (MCG); a unit for determining the state of the SCG; and / or a unit for initiating activation of the SCG at least in part based on the state of the SCG. Units for enabling the UE to perform the operations described herein may include one or more of the following: controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, or memory 282.

[0054] In some aspects, the UE may further include: a unit for receiving timing advance (TA) information on the SCG, at least in part based on initiating activation of the SCG. Additionally or alternatively, the UE may include a unit for transmitting MCG fault recovery information on the SCG.

[0055] In some aspects, the UE may further include: a unit for preventing the transmission of a request for Radio Resource Control (RRC) re-establishment on the MCG, at least in part based on the detection of an RLF. Additionally or alternatively, the UE may include: a unit for transmitting MCG fault recovery information on the SCG, the MCG fault recovery information being forwarded to the MCG's master node; and a unit for receiving MCG reconnection information on the SCG and at least in part based on the transmission of the MCG fault recovery information.

[0056] Additionally, in some aspects, the UE may include: a unit for receiving data transmission on the SCG and before the fault recovery of the MCG is completed, and / or a unit for transmitting data transmission on the SCG and before the fault recovery of the MCG is completed.

[0057] In some aspects, a base station within an SCG (e.g., base station 110) may include: a unit for receiving from a UE a message for initiating activation of the SCG, wherein when the base station receives the message, the SCG is in a deactivated state, a dormant state, or an enhanced dormant state, and the UE has detected an RLF with the MCG; and / or a unit for sending TA information to the UE, at least in part, based on the receipt of the message. Units for enabling the base station to perform the operations described herein may include one or more of, for example, antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, memory 242, or scheduler 246.

[0058] In some aspects, the base station may further include: a unit for receiving MCG fault recovery information from the UE and at least partially based on TA information. Additionally, the base station may include: a unit for transmitting MCG fault recovery information to the MCG master node. Furthermore, the base station may include: a unit for receiving MCG reconnection information from the master node and at least partially based on the transmitted MCG fault recovery information; and a unit for transmitting MCG reconnection information to the UE.

[0059] Additionally, in some aspects, the base station may include: a unit for receiving data intended for the UE; and a unit for sending data to the UE and before the fault recovery for the MCG is completed.

[0060] Although Figure 2The boxes in the diagram are shown as different components, but the functions described above with respect to the 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 transmit processor 264, receive processor 258, and / or TX MIMO processor 266 can be performed by controller / processor 280, or performed under the control of controller / processor 280.

[0061] As mentioned above, providing Figure 2 As an example. Other examples can be related to... Figure 2 The examples described are different.

[0062] Figure 3A This is a diagram illustrating example 300 of a UE configured for use with an MR-DC of MCG and SCG, according to this disclosure. Figure 3A As shown, Example 300 includes UE 120, first base station 110a and second base station 110b.

[0063] In some aspects, UE 120 can be a dual-connectivity device. For example, dual connectivity can allow UE 120 to simultaneously transmit and receive data across multiple cell groups via a primary base station (e.g., first base station 110a) also referred to as the primary node (MN) and a secondary base station (e.g., second base station 110b) also referred to as the secondary node (SN). In some aspects, dual connectivity can support load balancing between multiple base stations (e.g., between the first base station 110a and the second base station 110b).

[0064] In some aspects, UE 120 may indicate dual connectivity capability to one or more base stations. For example, UE 120 may send a UECapabilityInformation message as defined by the 3GPP specifications to a first base station 110a and / or a second base station 110b. Although the following description will focus on the UECapabilityInformation message, this description similarly applies to another message associated with information about the dual connectivity capability of UE 120. In some aspects, the UECapabilityInformation message may be a broadcast message from UE 120.

[0065] In some aspects, UE 120 may establish and / or request the establishment of a first communication link 310a with the first base station 110a (e.g., via a Uu interface). Additionally or alternatively, UE 120 may establish and / or request the establishment of a second communication link 310b with the second base station 110b (e.g., via a Uu interface). In some aspects, UE 120 may establish the first communication link 310a with the first base station 110a at least in part based on a first radio of UE 120. Similarly, in some aspects, UE 120 may establish the second communication link 310b with the second base station 110b at least in part based on a second radio of UE 120.

[0066] In some aspects, the first base station 110a can communicate directly with the second base station 110b. For example, the first base station 110a and the second base station 110b can establish a backhaul link 320 (e.g., via X2, Xn, and / or another similar interface). In some aspects, the backhaul link 320 may include a direct link (e.g., a direct link between base stations 110a and 110b) and / or an indirect link (e.g., via a core network, such as including...). Figure 1 (Core network of network controller 130).

[0067] In some aspects, the first base station 110a may send downlink control information (DCI) to the UE 120 and / or indicate that the base station 110b has entered a suspended state (e.g., deactivated state, dormant state, or enhanced dormant state, as combined below). Figure 3B Other information described herein. Therefore, UE 120 can maintain lower-layer configurations (e.g., physical (PHY) layer configuration, media access control (MAC) configuration, radio link control (RLC) configuration, and / or another layer configuration) for the second base station 110b.

[0068] In some aspects, the first base station 110a may send a MAC control element (MAC-CE) and / or other information to the UE 120 to indicate that the second base station 110b has entered an active state. Accordingly, the UE 120 may use the maintained lower-layer configuration for base station 110b to re-establish the connection with the second base station 110b (e.g., the second communication link 310b).

[0069] In Example 300, dual connectivity allows UE 120 to send and / or receive data with one or more base stations from MCG (e.g., including the first base station 110a), and simultaneously send and / or receive data with one or more base stations from SCG (e.g., including the second base station 110b). When the SCG (e.g., including the second base station 110b) enters a suspended state (e.g., deactivated state, sleep state, or enhanced sleep state, as combined below)... Figure 3B As described, there is no expected data service between the SCG and the associated UE (e.g., UE 120). In some aspects, UE 120 may perform measurements on the last serving base station from the SCG (e.g., second base station 110b). For example, when the second base station 110b is in a suspended state (e.g., a dormant state or an enhanced dormant state, as combined below) Figure 3B When described, UE 120 can perform measurements on the second base station 110b with reduced requirements (e.g., longer intervals between measurements for power saving).

[0070] In some aspects, when the second base station 110b is in a suspended state (e.g., a dormant state or an enhanced dormant state, as combined below) Figure 3B As described, UE 120 can be configured to bypass the performance of certain measurements, such as CQI measurements, Radio Resource Management (RRM) measurements, and / or other measurements. For example, UE 120 can bypass certain measurements based on the expectation that there will be no channel change since the second base station 110b has entered a suspended state. Additionally or alternatively, UE 120 can be configured for power-effective measurements (e.g., CQI, RRM, and / or other measurements).

[0071] In some aspects (for example, as combined below) Figure 3B As described in the enhanced sleep state, UE 120 can be triggered to report one or more measurements (e.g., CQI measurements) based on a Tracking Reference Signal (TRS). In some aspects, UE 120 can receive the TRS from at least one of a first base station 110a or a second base station 110b. In some aspects, the TRS can be periodic or aperiodic. Additionally or alternatively, UE 120 can be triggered to report one or more measurements based on a DCI from the first base station 110a and / or another base station within the MCG.

[0072] In some aspects, when the second base station 110b is in a suspended state, its upper-layer configuration (e.g., including signaling radio bearers (SRBs) and data radio bearers (DRBs)) can be maintained at the second base station 110b. Additionally or alternatively, when the second base station 110b is in a suspended state, its lower-layer configuration can be maintained by at least one of the second base station 110b, the first base station 110a, and / or the UE 120. Alternatively, the second base station 110b can be reconfigured to use the lower-layer resources of the first base station 110a via segmented bearers (e.g., enabling the DRBs of the second base station 110b to use the lower-layer resources of the first base station 110a). In some aspects, as described above, MAC-CE, DCI, and / or other messages can be used (e.g., to the UE 120) to indicate that the second base station 110b is in a suspended state and / or that the second base station 110b is activated.

[0073] In some aspects, UE 120 may perform a random access procedure with the second base station 110b after receiving an indication from the first base station 110a that the second base station 110b has been activated (e.g., in conjunction with the following). Figure 4 The two-step random access procedure described and / or combined as follows Figure 5 The four-step random access procedure described. Additionally or alternatively, the reconnection of UE 120 to the second base station 110b may include determining the TA parameters of the second base station 110b based at least in part on the TA parameters of the first base station 110a, the system frame number offset, a first propagation delay between the first base station 110a and UE 120 (e.g., propagation delay on the first communication link 310a) and / or a second propagation delay between the second base station 110b and UE 120 (e.g., propagation delay on the second communication link 310b).

[0074] In some aspects, when the SCG (e.g., including the second base station 110b) is in a suspended state (e.g., deactivated state, dormant state, or enhanced dormant state, as combined below) Figure 3BWhen (as described), UE 120 may not expect data transmission on the Physical Downlink Shared Channel (PDSCH) and / or Physical Uplink Shared Channel (PUSCH) from the second base station 110b and / or another base station in the SCG. Therefore, when the second base station 110b is suspended, UE 120 may bypass the Physical Downlink Control Channel (PDCCH) monitoring the second base station 110b (e.g., which may be the primary / secondary cell (PSCell) of the SCG). Additionally or alternatively, when the second base station 110b is suspended, UE 120 may bypass sending an Uplink Probe Reference Signal (SRS), transmission on the Random Access Channel (RACH) message, and / or transmission on the Physical Uplink Control Channel (PUCCH) to the second base station 110b (e.g., as described above, which may be the PSCell of the SCG).

[0075] In some aspects, the first base station 110a (e.g., it may be the MN of an MCG) can reconfigure the configuration of the second base station 110b (e.g., it may be the SN of an SCG) based on the second base station 110b entering a suspended state. For example, the first base station 110a within the MCG can reconfigure the lower-layer configuration (e.g., PHY layer configuration, MAC configuration, RLC configuration, and / or another layer configuration) of the second base station 110b within the SCG to use one or more lower-layer resources of the first base station 110a b. Additionally or alternatively, the first base station 110a may allow the second base station 110b to continue using one or more lower-layer resources of the second base station 110b.

[0076] As mentioned above, providing Figure 3A As an example. Other examples can be related to... Figure 3A The examples described are different.

[0077] Figure 3B This is a diagram illustrating example 330 of the SCG state of a UE according to this disclosure. Figure 3B A table showing the SCG states is provided, including SCG deactivated state, SCG hibernation state, SCG enhanced hibernation state, and SCG activated state.

[0078] When the UE operates in SCG deactivated state, it can prevent monitoring of the PDCCH on the PSCell, prevent uplink communication from being transmitted on the PSCell, prevent channel state information (CSI) measurements from being performed on the PSCell, and prevent maintaining uplink timing alignment with the SN in the PSCell. The UE can also perform RRM measurements on the PSCell (and send reports on the MCG), and prevent performing radio link monitoring (RLM) measurements.

[0079] In some aspects, the UE can be in SCG sleep mode or SCG enhanced sleep mode, allowing the UE to consume less power and / or minimize the transition delay to SCG active mode. When the UE is operating in SCG sleep mode, the UE can prevent monitoring of the PDCCH on the PSCell, prevent uplink communication on the PSCell, and perform CSI measurements in the sleep downlink bandwidth portion (BWP) on the PSCell, but prevent sending CSI reports for the PSCell. The UE can prevent maintaining uplink timing alignment with the SN in the PSCell, perform RRM measurements on the PSCell (and send reports on the MCG), and prevent performing RLM measurements.

[0080] When the UE is operating in the enhanced sleep state of the SCG, the UE can prevent monitoring of the PDCCH on the PSCell, perform CSI measurements in the enhanced sleep downlink BWP on the PSCell, send CSI reports in the PUCCH for the PSCell, maintain uplink timing alignment with the SN in the primary and secondary cells, perform RRM measurements on the primary and secondary cells (and send reports on the MCG), and prevent the execution of RLM measurements.

[0081] When the UE is operating in SCG active state, it can receive messages on the PDCCH in the PSCell and transmit uplink and / or downlink data on the PSCell. The UE can perform CSI measurements, send CSI reports, and maintain uplink timing alignment with the SN in the PSCell. The UE can also perform and report RRM and / or RLM measurements. In other words, when operating in SCG active state, the UE can use the SCG to perform communications and use the active SCG to perform other operations as expected.

[0082] In some aspects, the SCG state of the UE for the secondary cell (SCell) can be either SCell deactivated or SCell dormant.

[0083] As mentioned above, providing Figure 3B As an example. Other examples can be related to... Figure 3B The examples described are different.

[0084] Figure 4 This is a diagram illustrating Example 400 of a two-step random access process according to this disclosure. (See diagram for example.) Figure 4 As shown, base station 110 and UE 120 can communicate with each other to perform a two-step random access procedure.

[0085] As shown by reference numeral 405 in the attached figure, base station 110 can transmit and UE 120 can receive one or more synchronization signal blocks (SSBs) and random access configuration information. In some aspects, the random access configuration information may be transmitted and / or indicated by system information (e.g., in one or more system information blocks (SIBs)) and / or SSBs, for example, for contention-based random access. Additionally or alternatively, the random access configuration information may be transmitted in RRC messages and / or PDCCH command messages that trigger a RACH procedure (e.g., for contention-free random access). The random access configuration information may include one or more parameters to be used in a two-step random access procedure, such as one or more parameters for transmitting a random access message (RAM) and / or receiving a random access response (RAR) to the RAM.

[0086] As shown by reference numeral 410, UE 120 can send a RAM preamble, and base station 110 can receive the RAM preamble. As shown by reference numeral 415, UE 120 can send a RAM payload, and base station 110 can receive the RAM payload. As shown, UE 120 can send the RAM preamble and RAM payload to base station 110 as part of the initial (or first) step of a two-step random access procedure. In some aspects, in the two-step random access procedure, RAM may be referred to as message A, msgA, first message, or initial message. Furthermore, in some aspects, RAM preamble may be referred to as message A preamble, msgA preamble, preamble, or Physical Random Access Channel (PRACH) preamble, and RAM payload may be referred to as message A payload, msgA payload, or payload. In some aspects, RAM may include some or all of the contents of message 1 (msg1) and message 3 (msg3) of the four-step random access procedure, which is described in more detail below. For example, the RAM preamble may include some or all of message 1 (e.g., PRACH preamble), and the RAM payload may include some or all of message 3 (e.g., UE identifier, uplink control information (UCI), and / or PUSCH transmission).

[0087] As shown by reference numeral 420 in the attached figure, base station 110 can receive the RAM preamble sent by UE 120. If base station 110 successfully receives and decodes the RAM preamble, base station 110 can subsequently receive and decode the RAM payload.

[0088] As shown by reference numeral 425 in the attached figure, base station 110 can send a RAR (sometimes referred to as a RAR message). As shown, base station 110 can send the RAR message as part of the second step of a two-step random access procedure. In some aspects, during the two-step random access procedure, the RAR message may be referred to as message B, msgB, or the second message. The RAR message may include some or all of the contents of messages 2 (msg2) and 4 (msg4) of the four-step random access procedure. For example, the RAR message may include the detected PRACH preamble identifier, the detected UE identifier, timing advance value, and / or contention resolution information.

[0089] As shown by reference numeral 430 in the attached figure, as part of the second step of the two-step random access procedure, base station 110 may transmit PDCCH communications for RAR. The PDCCH communications may schedule PDSCH communications that include RAR. For example, the PDCCH communications may indicate resource allocation for PDSCH communications (e.g., in DCI).

[0090] As shown by reference numeral 435, as part of the second step of the two-step random access procedure, base station 110 may send PDSCH communication for RAR, as scheduled by PDCCH communication. RAR may be included in the MAC Protocol Data Unit (PDU) of the PDSCH communication. As shown by reference numeral 440, if UE 120 successfully receives RAR, UE 120 may send a Hybrid Automatic Repeat Request (HARQ) acknowledgment (ACK).

[0091] As mentioned above, providing Figure 4 As an example. Other examples can be related to... Figure 4 The examples described are different.

[0092] Figure 5 This is a diagram illustrating Example 500 of a four-step random access procedure according to this disclosure. Figure 5 As shown, base station 110 and UE 120 can communicate with each other to perform a four-step random access procedure.

[0093] As shown by reference numeral 505 in the accompanying drawings, base station 110 can transmit and UE 120 can receive one or more SSBs and random access configuration information. In some aspects, the random access configuration information may be transmitted and / or indicated by the SSB in system information (e.g., in one or more SIBs) and / or SSBs, for example, for contention-based random access. Additionally or alternatively, the random access configuration information may be transmitted in RRC messages and / or PDCCH command messages that trigger a RACH procedure (e.g., for contention-free random access). The random access configuration information may include one or more parameters to be used in the random access procedure, for example, one or more parameters for transmitting RAM and / or one or more parameters for receiving RAR.

[0094] As shown by reference numeral 510 in the attached figure, UE 120 can transmit RAM, which may include a preamble (sometimes referred to as a random access preamble, PRACH preamble, or RAM preamble). During the four-step random access process, the message including the preamble may be referred to as Message 1, msg1, MSG1, First Message, or Initial Message. The random access message may include a random access preamble identifier.

[0095] As shown by reference numeral 515 in the attached figure, base station 110 may send a RAR as a response to the preamble. During the four-step random access process, the message including the RAR may be referred to as message 2, msg2, MSG2, or the second message. In some aspects, the RAR may indicate the detected random access preamble identifier (e.g., received from UE 120 in msg1). Additionally or alternatively, the RAR may indicate the resource allocation to be used by UE 120 to send message 3 (msg3).

[0096] In some aspects, as part of the second step of the four-step random access procedure, base station 110 may transmit PDCCH communications for RAR. The PDCCH communications may schedule PDSCH communications that include RAR. For example, the PDCCH communications may indicate resource allocation for PDSCH communications. Furthermore, as part of the second step of the four-step random access procedure, base station 110 may transmit PDSCH communications for RAR, as scheduled by the PDCCH communications. RAR may be included in the MACPDU of the PDSCH communications.

[0097] As shown by reference numeral 520 in the attached figure, UE 120 may send an RRC connection request message. The RRC connection request message may be referred to as message 3, msg3, MSG3, or a third message in the four-step random access procedure. In some aspects, the RRC connection request may include a UE identifier, UCI, and / or PUSCH communication (e.g., an RRC connection request).

[0098] As shown by reference numeral 525, base station 110 can send an RRC connection establishment message. The RRC connection establishment message may be referred to as message 4, msg4, MSG4, or the fourth message in the four-step random access procedure. In some aspects, the RRC connection establishment message may include the detected UE identifier, timing advance value, and / or contention resolution information. As shown by reference numeral 530, if UE 120 successfully receives the RRC connection establishment message, UE 120 can send a HARQ ACK.

[0099] As mentioned above, providing Figure 5 As an example. Other examples can be related to... Figure 5 The examples described are different.

[0100] Figure 6 This is a diagram illustrating an example 600 of SCG activation for MR-DC according to this disclosure. Figure 6 As shown, the MN610a of the MCG (e.g., including the first base station 110a) can communicate with the SN 610b of the SCG (e.g., including the second base station 110b) and the UE 620 (e.g., UE 120). In some aspects, the SN 610b can be associated with the PSCell of the SCG.

[0101] As shown in conjunction with reference numeral 625 in the accompanying drawings, UE 620 can determine that the SCG is in a deactivated state, a dormant state, or an enhanced dormant state (e.g., as shown above in conjunction with reference numeral 625). Figure 3B (As described). For example, UE 620 may have received MAC-CE, DCI and / or other messages from MN 610a and / or SN610b indicating that SN 610b is moving to a deactivated state, a hibernation state or an enhanced hibernation state.

[0102] As shown in conjunction with reference numeral 630, data can reach SN 610b. In some aspects, the data may include data intended for one or more DRBs using resources provided by the SCG. For example, data may be received on a bearer terminated by an MN that requires SCG resources.

[0103] Therefore, as shown in conjunction with reference numeral 635, SN 610b can provide an SN activation request to MN 610a. Furthermore, as shown in conjunction with reference numeral 640, MN 610a can send an SCG activation message to UE 620. In some aspects, the SCG activation message may include MAC-CE, DCI, and / or other messages, as described above. Figure 3A As described.

[0104] As shown in conjunction with reference numeral 645, UE 620 may send an SCG activation confirmation to MN 610a. In some aspects, UE 620 may resume use of lower-layer configurations (e.g., PHY layer configuration, MAC configuration, RLC configuration, and / or another layer configuration) of SN 610b, as described above. Figure 3A As described. Therefore, UE 620 can send SCG activation confirmation at least in part based on the resumption of use of the underlying configuration.

[0105] Depending on whether UE 620 is in SCG sleep mode or SCG enhanced sleep mode, as shown in conjunction with reference numeral 650, UE 620 can perform a RACH procedure with SN 610b (e.g., as shown above in conjunction with reference numeral 650). Figure 4 The two-step random access procedure described and / or combined as above Figure 5 The four-step random access process described.

[0106] In some respects, UE 620 can bypass the RACH process, at least in part, based on whether UE 620 is in an SCG enhanced sleep state, as described above. Figure 3B As described. For example, if UE 620 is in SCG sleep mode, UE 620 can perform the RACH procedure after receiving the SCG activation message. UE 620 may have already performed CSI measurements on PSCell (e.g., SN 610b) in SCG sleep mode, so that after UE 620 completes the RACH procedure, UE 620 can send one or more CSI reports to SN 610b, as shown in conjunction with reference numeral 655.

[0107] However, if UE 620 is in an SCG-enhanced sleep state, UE 620 can bypass the RACH procedure. As a supplement to or alternative to the RACH procedure, UE 620 can receive scheduling information after receiving the SCG activation message. For example, UE 620 may have already sent one or more CSI reports in the SCG-enhanced sleep state, and SN 610b (and / or MN610a) can use these CSI reports to schedule communications instead of receiving new CSI reports from UE 620.

[0108] As shown in conjunction with reference numeral 660, UE 620 and SN 610b can initiate data transmission. In some aspects, data transmission may include UE 620 receiving data that has arrived at SN 610b, as described above in conjunction with reference numeral 630. Data transmission may additionally include UE 620 sending HARQ feedback to SN 610b based at least in part on whether UE 620 has successfully received and decoded the data that has arrived at SN 610b. Additionally or alternatively, data transmission may include SN 610b receiving data intended for use in the SCG from UE 620. Thus, as described above, UE 620 can initiate data transmission from the SCG enhanced sleep state faster than from the SCG sleep state.

[0109] As mentioned above, providing Figure 6 As an example. Other examples can be related to... Figure 6 The examples described are different.

[0110] In some cases, when the SCG (and therefore the UE) is in a deactivated, dormant, or enhanced dormant state, the UE can detect an RLF with the MCG's MN. Typically, the UE recovers the MCG RLF by performing an RRC reconstruction with the MCG. RRC reconstruction usually involves the UE performing a cell search, measuring the cells found in the search, and then rebuilding the RRC connection based on the measurement results. This process is slow and consumes processing and network resources, as well as the UE's battery power.

[0111] The technologies and apparatus disclosed herein allow a UE (e.g., UE 120) to initiate activation of an SCG from a deactivated state, a dormant state, or an enhanced dormant state, instead of waiting for an MN from an associated MCG (e.g., as combined below). Figure 7 and 8 The SCG activation message described in MN 705a) allows UE 120 to use the activated SCG for MCG RLF recovery instead of performing RRC reconstruction. As a result, compared to performing a cell search and rebuilding the RRC connection with the MCG, UE 120 reduces latency and saves processing and network resources as well as battery power. Furthermore, if data arrives at the SCG's SN during MCG RLF recovery (e.g., as described below),... Figure 7 and 8 As described in SN 705b, SN 705b can transmit data to UE 120 during MCG RLF recovery. Therefore, SN 705b reduces the latency of transmitting data to UE 120 by using an already established channel. Furthermore, SN 705b saves network and processing resources compared to establishing a new channel between SN 705b and UE 120 to transmit data.

[0112] Figure 7 This is a diagram illustrating example 700 of SCG activation for MCG RLF recovery according to this disclosure. Figure 7 As shown, the MN 705a of the MCG (e.g., the first base station 110a) can communicate with the SN 705b of the SCG (e.g., the second base station 110b) and the UE (e.g., UE 120). Therefore, the UE 120 can be configured for MR-DC (e.g., as described above in conjunction with...). Figure 6 (As described above). For example, UE 120 can have dual connectivity with MCG and SCG (e.g., as combined above). Figure 3A (As described). In some respects, SN 705b can be associated with the SCG's PSCell.

[0113] As shown in conjunction with reference numeral 710, UE 120 can detect RLF on the MCG. For example, UE 120 can determine that RSRP, RSSI, CQI, and / or another metric of channel quality on the MCG meet a threshold indicating an RLF and / or fail to decode PDCCH and / or PDSCH messages sent by MN705a and / or another node of the MCG. In some aspects, UE 120 can prevent the transmission of requests for RRC reconstruction based at least in part on the detection of an RLF. For example, UE 120 can perform SCG activation, as described below, instead of performing RRC reconstruction.

[0114] As further illustrated with reference to reference numeral 710 in the accompanying drawings, UE 120 can determine the state of the SCG. For example, UE 120 can retrieve the state of another cell, such as the PSCell and / or SCG, stored in UE 120's memory. Additionally or alternatively, UE 120 may have previously received MAC-CE, DCI, and / or other messages indicating the state of the SCG from MN 705a and / or SN 705b.

[0115] As shown in conjunction with reference numeral 715, UE 120 can initiate SCG activation at least in part based on the state of the SCG. In some aspects, UE 120 can activate the SCG at least in part based on whether the state (e.g., as determined above in conjunction with reference numeral 710) is a deactivated state, a dormant state, or an enhanced dormant state (e.g., as described above in conjunction with reference numeral 715). Figure 3B (as described) to initiate activation.

[0116] In some aspects, UE 120 can initiate a random access procedure on the SCG (e.g., on the PSCell of the SCG) to initiate activation of the SCG. For example, UE 120 can initiate a random access procedure by sending a random access preamble on the SCG (e.g., on the PSCell of the SCG). For example, UE 120 can send a two-step preamble (e.g., as combined above). Figure 4 The description of msgA) or four-step preamble (e.g., as combined above) Figure 5 (as described in msg1). Additionally or alternatively, UE 120 may send a scheduling request (SR) and / or another message on the SCG (e.g., on the PSCell of the SCG) to initiate activation of the SCG.

[0117] As shown in conjunction with reference numeral 720, SN 705b can transmit TA information on the SCG (e.g., on the PSCell of the SCG), and UE 120 can receive TA information on the SCG. For example, the TA information can be included in the random access response (e.g., as shown above in conjunction with reference numeral 720). Figure 4 The description is included in msgB, or in combination with the above. Figure 5 The description is included in msg2). In some respects, UE 120 may receive TA at least in part based on initiating activation of SCG (e.g., by sending a random access preamble, SR, and / or another message).

[0118] As shown in conjunction with reference numeral 725, UE 120 may transmit MCG fault recovery information on the SCG (e.g., on the PSCell of the SCG). In some aspects, the MCG fault recovery information may be included in msg3 of the random access procedure. For example, UE 120 may transmit msg3 as described above. Figure 5 As described. In some aspects, UE 120 may transmit MCG fault recovery information at least in part based on TA information (e.g., received as described above in conjunction with reference numeral 720). For example, UE 120 may determine the subframe in which to transmit MCG fault recovery information based at least in part on the TA information.

[0119] As shown in conjunction with reference numeral 730 in the accompanying drawings, SN 705b can send MCG fault recovery information to the MCG. For example, SN705b can use a return route (e.g., as described above). Figure 3AThe described backhaul link 320 is used to send MCG fault recovery information to MN 705a and / or another node of the MCG. In some aspects, SN 705b may forward MCG fault recovery information received from UE 120 as described above in conjunction with reference numeral 725 to MN 705a. Alternatively, SN 705b may generate messages (e.g., new RRC messages, F1 Application Protocol (F1-AP) messages, and / or XN messages) based at least in part on the MCG fault recovery information and send the generated messages to MN 705a.

[0120] As shown in conjunction with reference numeral 735, MN 705a can send MCG reconnection information, and SN 705b can receive MCG reconnection information. In some aspects, MN 705a can send MCG reconnection information based at least in part on MCG fault recovery information (e.g., as described above in conjunction with reference numeral 730).

[0121] As shown in conjunction with reference numeral 740, on the SCG (e.g., on the PSCell of the SCG) and based at least in part on the MCG fault recovery information, SN 705b can send MCG reconnection information, and UE 120 can receive the MCG reconnection information. In some aspects, SN 705b can forward the MCG reconnection information received from MN 705a as described in conjunction with reference numeral 735 to UE 120. Alternatively, SN 705b can generate a message (e.g., a new RRC message, a RACH message, and / or another message) based at least in part on the MCG reconnection information and send the generated message to UE 120.

[0122] By using, such as combination Figure 7 The described technology allows UE 120 to initiate SCG activation from a deactivated, dormant, or enhanced dormant state, instead of waiting for an SCG activation message from another node of MN 705a and / or MCG. Therefore, UE 120 can use the activated SCG for MCG RLF recovery instead of performing RRC reconstruction. As a result, compared to performing cell search and rebuilding the RRC connection with the MCG, UE 120 can perform MCG RLF recovery faster and save network resources, processing resources, and battery power.

[0123] As mentioned above, providing Figure 7 As an example. Other examples can be related to... Figure 7 The examples described are different.

[0124] Figure 8This is a diagram illustrating an example 800 of SCG data transmission concurrent with MCG RLF recovery according to this disclosure. Figure 8 As shown, the MN 705a of the MCG (e.g., the first base station 110a) can communicate with the SN 705b of the SCG (e.g., the second base station 110b) and the UE (e.g., UE 120). Therefore, UE 120 can be configured for MR-DC (e.g., as described above in combination). Figure 6 (As described). For example, UE 120 can have dual connectivity with MCG and SCG (e.g., as combined above). Figure 3A (As described). In some respects, SN 705b can be associated with the SCG's PSCell.

[0125] As shown in conjunction with reference numeral 805 in the accompanying drawings, UE 120 can detect RLF on the MCG. For example, UE 120 can be similar to the above-described... Figure 7 The attached figure, reference numeral 710, describes the detection method for detecting RLF.

[0126] As shown in conjunction with reference numeral 810, UE 120 can initiate SCG activation at least in part based on the state of the SCG. For example, UE 120 can do something similar to the above. Figure 7 The attached reference numeral 715 describes the initiation of activation of the SCG. In some aspects, the UE 120 may initiate activation at least in part based on the state of the SCG being inactive, dormant, or enhanced dormant (e.g., as described above). Figure 3B (As described).

[0127] In some aspects, UE 120 can initiate a random access procedure on the SCG (e.g., on the PSCell of the SCG) to initiate activation of the SCG. For example, UE 120 can initiate a random access procedure by sending a random access preamble on the SCG (e.g., on the PSCell of the SCG). For example, UE 120 can send a random access preamble on the SCG (e.g., on the PSCell of the SCG) to initiate a random access procedure. For example, UE 120 can send a two-step preamble (e.g., as combined above). Figure 4 The description of msgA) or four-step preamble (e.g., as combined above) Figure 5 (as described in msg1). Additionally or alternatively, UE 120 may send SR and / or another message on the SCG (e.g., on the PSCell of the SCG) to initiate activation of the SCG.

[0128] As shown in conjunction with reference numeral 815, SN 705b can transmit TA information on the SCG (e.g., on the PSCell of the SCG), and UE 120 can receive TA information on the SCG. For example, similar to the above. Figure 7 The accompanying reference numeral 720 describes the transmission and reception; SN 705b can transmit and UE 120 can receive TA information.

[0129] As shown in conjunction with reference numeral 820, SN 705b can receive data transmissions intended for UE 120. For example, the data transmissions may include payloads intended for delivery to UE 120 on downlink channels (e.g., PDSCH, RACH, and / or another downlink channel from SN 705b to UE 120). In some aspects, the data may include data intended for use with one or more DRBs provided by SCG. For example, as further shown in conjunction with reference numeral 820, data can be received on bearers that require SCG resources and are terminated by MN. In some aspects, SN 705b can receive data transmissions intended for UE 120 from a core network supporting SCG. For example, SN 705b can receive data transmissions intended for UE 120 from a network controller (e.g., [network controller name missing]) that is part of the core network. Figure 1 The network controller 130 receives data.

[0130] As shown in conjunction with reference numeral 825, SN 705b can transmit data on the SCG (e.g., on the PSCell of the SCG), and UE 120 can receive data on the SCG. For example, SN 705b can use a RACH established by a random access procedure to transmit data (e.g., established as part of activating the SCG, as described above in conjunction with reference numerals 810 and 815). In some aspects, SN 705b can transmit data and UE 120 can receive data before the MCG fault recovery is completed (e.g., before UE 120 receives MCG reconnection information). Therefore, SN 705b can transmit data to UE 120 concurrently with receiving MCG fault recovery information from UE 120 and / or sending MCG fault recovery information (and / or messages at least partially based on MCG fault recovery information) to MN 705a. In some aspects, data transmission may additionally include UE 120 sending HARQ feedback to SN705b, at least in part, based on whether UE 120 has successfully received and decoded the data that has arrived at SN705b. Additionally or alternatively, data transmission may include SN 705b receiving data from UE 120 intended for use with the SCG. Therefore, UE 120 may send and SN 705b may receive data transmissions before the MCG fault recovery is complete (e.g., before UE 120 receives MCG reconnection information).

[0131] As shown in conjunction with reference numeral 830, UE 120 can perform MCG fault recovery. For example, UE 120 can send MCG fault recovery information on the SCG (e.g., on the PSCell of the SCG). Therefore, SN 705b can send MCG fault recovery information to the MCG, enabling MN 705a to send and SN 705b to receive MCG reconnection information. UE 120 can receive MCG reconnection information on the SCG (e.g., on the PSCell of the SCG) and at least in part based on sending MCG fault recovery information. In some aspects, UE 120, MN 705a, and SN 705b can perform MCG fault recovery as described above. Figure 7 The figures are described by reference numerals 730, 735, and 740. Therefore, the steps performed in conjunction with reference numeral 830 can be similar to those in conjunction with... Figure 7 The steps performed are indicated by reference numerals 725, 730, and 735. As described above in conjunction with reference numeral 825, SN 705b can perform fault recovery for MCG in parallel (e.g., concurrently) with the transmission of data to UE 120.

[0132] By using, such as combination Figure 8The described technology allows SN 705b to transmit data to UE 120 using the RACH (and / or other downlink channels) established during MCG RLF recovery. As a result, SN 705b reduces the latency of transmitting data to UE 120. Furthermore, compared to establishing a new channel between SN 705b and UE 120 to transmit data, SN 705b saves network and processing resources.

[0133] As mentioned above, providing Figure 8 As an example. Other examples can be related to... Figure 8 The examples described are different.

[0134] Figure 9 This is a diagram illustrating an example process 900 performed by a UE according to various aspects of this disclosure. Example process 900 is an example in which a UE (e.g., UE 120) performs operations associated with activating an SCG based at least in part on the detection of an RLF associated with an MCG.

[0135] like Figure 9 As shown, in some aspects, process 900 may include: detecting RLF on the MCG (block 910). For example, the UE (e.g., using antenna 252, demodulator 254, MIMO detector 256, receiver processor 258, transmitter processor 264, TXMIMO processor 266, modulator 254, controller / processor 280, and / or memory 282) may detect RLF on the MCG as described above.

[0136] like Figure 9 As further shown, in some aspects, process 900 may include determining the state of the SCG (block 920). For example, the UE (e.g., using antenna 252, demodulator 254, MIMO detector 256, receiver processor 258, transmitter processor 264, TXMIMO processor 266, modulator 254, controller / processor 280, and / or memory 282) may determine the state of the PSCell of the SCG as described above.

[0137] like Figure 9 As further shown, in some aspects, process 900 may include initiating SCG activation at least in part based on the state of the SCG (block 930). For example, the UE (e.g., using antenna 252, demodulator 254, MIMO detector 256, receiver processor 258, transmitter processor 264, TX MIMO processor 266, modulator 254, controller / processor 280 and / or memory 282) may initiate SCG activation at least in part based on the state of the SCG, as described above.

[0138] Process 900 may include other aspects, such as any single aspect or any combination of aspects of one or more other processes described below and / or in conjunction with other parts of this document.

[0139] In the first aspect, the UE is configured for MR-DC.

[0140] In the second aspect, activation of the SCG, either alone or in combination with the first aspect, includes initiating a random access procedure on the SCG's PSCell (e.g., using antenna 252, demodulator 254, MIMO detector 256, receiver processor 258, transmitter processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, and / or memory 282).

[0141] In the third aspect, initiating a random access procedure, either alone or in combination with one or more aspects of the first or second aspect, includes transmitting a random access preamble on the PSCell (e.g., using antenna 252, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, and / or memory 282).

[0142] In the fourth aspect, either alone or in combination with one or more of the first to third aspects, process 900 further includes: receiving TA information on the SCG (e.g., using antenna 252, demodulator 254, MIMO detector 256, receiver processor 258, controller / processor 280, and / or memory 282) based at least in part on the initiation of activation of the SCG.

[0143] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, process 900 further includes: transmitting MCG fault recovery information on the SCG (e.g., using antenna 252, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, and / or memory 282).

[0144] In the sixth aspect, activation of the SCG is initiated, either alone or in combination with one or more of the first to fifth aspects, based at least in part on the state being an inactive state, a dormant state, or an enhanced dormant state.

[0145] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, process 900 further includes: at least in part based on the detection of RLF, blocking (e.g., using antenna 252, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, and / or memory 282) the transmission of a request for RRC reconstruction on the MCG.

[0146] In the eighth aspect, either alone or in combination with one or more of the first to seventh aspects, process 900 further includes transmitting MCG fault recovery information on the SCG (e.g., using antenna 252, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280 and / or memory 282), the MCG fault recovery information being forwarded to the master node of the MCG; and receiving MCG reconnection information on the SCG and at least in part based on the transmission of the MCG fault recovery information.

[0147] In the ninth aspect, either alone or in combination with one or more of the first to eighth aspects, process 900 further includes receiving or transmitting data on the SCG and before fault recovery for the MCG is completed (e.g., using antenna 252, demodulator 254, MIMO detector 256, receiver processor 258, controller / processor 280 and / or memory 282).

[0148] although Figure 9 An example box of process 900 is shown, but in some aspects, process 900 may include: with Figure 9 Compared to those shown, there may be additional boxes, fewer boxes, different boxes, or boxes with different arrangements. Alternatively, two or more boxes in the process 900 may be executed in parallel.

[0149] Figure 10 This is a diagram illustrating an example process 1000 performed, for example, by a base station within an SCG, according to various aspects of this disclosure. Example process 1000 is an example in which a base station (e.g., SN 705b and / or base station 110) performs operations associated with activating the SCG, at least in part based on the RLF associated with the MCG.

[0150] like Figure 10 As shown, in some aspects, process 1000 may include receiving a message from a UE (e.g., UE 120) to initiate activation of the SCG (block 1010). For example, a base station (e.g., using antenna 234, demodulator 232, MIMO detector 236, receive processor 238, controller / processor 240, memory 242, and / or scheduler 246) may receive the message to initiate activation of the SCG, as described above. In some aspects, the SCG is in a deactivated state, a dormant state, or an enhanced dormant state while the base station is receiving the message. Additionally, in some aspects, the base station receives the message after the UE has detected an RLF with the MCG.

[0151] like Figure 10 As further shown, in some aspects, process 1000 may include sending TA information to the UE at least in part based on the received message (block 1020). For example, a base station (e.g., using transmit processor 220, TX MIMO processor 230, modulator 232, antenna 234, controller / processor 240, memory 242 and / or scheduler 246) may send TA information at least in part based on the received message, as described above.

[0152] Process 1000 may include additional aspects, such as any single aspect or any combination of aspects of one or more other processes described below and / or in conjunction with other parts of this document.

[0153] In the first aspect, the UE is configured for use with the MR-DC of the MCG and SCG.

[0154] In the second aspect, either alone or in combination with the first aspect, the message used to initiate activation of the SCG includes: a message used to initiate a random access procedure on the PSCell of the SCG.

[0155] In the third aspect, the message used to initiate the random access procedure, either alone or in combination with one or more of the first and second aspects, includes a random access preamble.

[0156] In the fourth aspect, either alone or in combination with one or more of the first to third aspects, process 1000 further includes receiving MCG fault recovery information from the UE and at least in part based on TA information (e.g., using antenna 234, demodulator 232, MIMO detector 236, receiver processor 238, controller / processor 240, memory 242 and / or scheduler 246).

[0157] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, process 1000 further includes sending MCG fault recovery information to the master node of the MCG (e.g., using transmit processor 220, TX MIMO processor 230, modulator 232, antenna 234, controller / processor 240, memory 242 and / or scheduler 246).

[0158] In the sixth aspect, either alone or in combination with one or more of the first to fifth aspects, process 1000 further includes: receiving MCG reconnection information from the master node and at least in part based on transmitting MCG fault recovery information (e.g., using antenna 234, demodulator 232, MIMO detector 236, receiver processor 238, controller / processor 240, memory 242 and / or scheduler 246); and transmitting MCG reconnection information to the UE (e.g., using transmitter processor 220, TX MIMO processor 230, modulator 232, antenna 234, controller / processor 240, memory 242 and / or scheduler 246).

[0159] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, process 1000 further includes: (e.g., using antenna 234, demodulator 232, MIMO detector 236, receiver processor 238, controller / processor 240, memory 242 and / or scheduler 246) receiving data intended for the UE; and transmitting data to the UE and before fault recovery for the MCG is completed (e.g., using transmitter processor 220, TX MIMO processor 230, modulator 232, antenna 234, controller / processor 240, memory 242 and / or scheduler 246).

[0160] In the eighth aspect, data intended for the UE is received from the core network supporting the SCG, either alone or in combination with one or more of the first to seventh aspects.

[0161] although Figure 10 An example box of process 1000 is shown, but in some aspects, process 1000 may include: with Figure 10 Compared to those shown, there may be additional boxes, fewer boxes, different boxes, or boxes with different arrangements. Alternatively, two or more boxes in the process 1000 may be executed in parallel.

[0162] The following provides an overview of some aspects of this disclosure:

[0163] Aspect 1: A method for wireless communication performed by a user equipment (UE) includes: detecting a radio link failure (RLF) on a primary cell group (MCG); determining the state of a secondary cell group (SCG); and initiating activation of the SCG by the UE based at least in part on the state of the SCG.

[0164] Aspect 2: According to the method of aspect 1, wherein the UE is configured for dual connectivity of multiple radio access technologies.

[0165] Aspect 3: The method according to any one of Aspects 1 to 2, wherein initiating activation of the SCG includes: initiating a random access procedure on the primary and secondary cells (PSCell) of the SCG.

[0166] Aspect 4: According to the method described in aspect 3, initiating a random access procedure includes: sending a random access preamble on the PSCell.

[0167] Aspect 5: The method according to any one of aspects 1 to 4 further includes: receiving timing advance (TA) information on the SCG.

[0168] Aspect 6: The method according to any one of aspects 1 to 5 further includes: sending MCG fault recovery information on the SCG.

[0169] Aspect 7: The method according to any one of Aspects 1 to 6, wherein the activation of the SCG is initiated at least in part based on the state being an inactive state, a dormant state, or an enhanced dormant state.

[0170] Aspect 8: The method according to any one of Aspects 1 to 7 further includes: preventing the transmission of a request for radio resource control reconstruction on the MCG, at least in part based on the detection of an RLF.

[0171] Aspect 9: The method according to any one of Aspects 1 to 8 further includes: sending MCG fault recovery information on the SCG, the MCG fault recovery information being forwarded to the master node of the MCG; and receiving MCG reconnection information on the SCG and at least in part based on sending the MCG fault recovery information.

[0172] Aspect 10: The method according to any one of Aspects 1 to 9 further includes: receiving or transmitting data on the SCG and before fault recovery for the MCG is completed.

[0173] Aspect 11: A method for performing wireless communication by a base station within a secondary cell group (SCG), comprising: receiving from a user equipment (UE) a message for initiating activation of the SCG, wherein when the base station receives the message, the SCG is in a deactivated state, a dormant state, or an enhanced dormant state, and the UE has detected a radio link failure (RLF) with the primary cell group (MCG); and sending timing advance (TA) information to the UE, at least in part based on the receipt of the message.

[0174] Aspect 12: According to the method of aspect 11, wherein the UE is configured for dual connectivity with the MCG and the SCG via multiple radio access technology.

[0175] Aspect 13: The method according to any one of Aspects 11 to 12, wherein the message for initiating activation of the SCG includes: a message for initiating a random access procedure on the primary and secondary cells (PSCell) of the SCG.

[0176] Aspect 14: According to the method of aspect 13, wherein the message for initiating the random access procedure includes: a random access preamble.

[0177] Aspect 15: The method according to any one of aspects 11 to 14 further includes: receiving MCG fault recovery information from the UE and at least in part based on the TA information.

[0178] Aspect 16: The method according to aspect 15 further includes: sending the MCG fault recovery information to the master node of the MCG.

[0179] Aspect 17: The method according to aspect 16 further includes: receiving MCG reconnection information from the master node and at least in part based on sending MCG fault recovery information; and sending MCG reconnection information to the UE.

[0180] Aspect 18: The method according to any one of Aspects 11 to 17 further includes: receiving data transmission intended for the UE; and sending the data transmission to the UE and before the fault recovery of the MCG is completed.

[0181] Aspect 19: The method according to aspect 18, wherein the data transmission intended for the UE is received from a core network supporting the SCG.

[0182] Aspect 20: 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 apparatus to perform the method according to one or more aspects of aspects 1-10.

[0183] Aspect 21: An apparatus 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 according to one or more aspects of aspects 1-10.

[0184] Aspect 22: An apparatus for wireless communication, comprising at least one unit for performing the method according to one or more aspects of aspects 1-10.

[0185] Aspect 23: A non-transitory computer-readable medium storing code for wireless communication, said code including instructions executable by a processor to perform the methods described in one or more aspects of aspects 1-10.

[0186] Aspect 24: 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 according to one or more aspects of aspects 1-10.

[0187] Aspect 25: 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 apparatus to perform one or more methods according to aspects 11-19.

[0188] Aspect 26: An apparatus 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 according to one or more aspects of aspects 11-19.

[0189] Aspect 27: An apparatus for wireless communication, comprising at least one unit for performing the method according to one or more aspects of aspects 11-19.

[0190] Aspect 28: A non-transitory computer-readable medium storing code for wireless communication, said code including instructions executable by a processor to perform the methods described in one or more aspects of aspects 11-19.

[0191] Aspect 29: 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 according to one or more aspects of aspects 11-19.

[0192] The foregoing disclosure provides illustrations and descriptions, but is not intended to be exhaustive or to limit aspects to the precise form disclosed. Modifications and variations can be made based on the foregoing disclosure, or from practice in these aspects.

[0193] As used herein, the term "component" is intended to be interpreted broadly as hardware and / or a combination of hardware and software. "Software" should be interpreted broadly to mean instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, and / or functions, regardless of whether it is referred to as software, firmware, middleware, microcode, hardware description languages, or other terms. As used herein, processors are implemented in hardware and / or a combination of hardware and software. It is evident that the systems and / or methods described herein can be implemented in various forms of hardware and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit these aspects. Therefore, this document describes the operation and behavior of systems and / or methods without reference to any specific software code—it should be understood that software and hardware can be designed to implement systems and / or methods, at least in part, based on the descriptions herein.

[0194] As used in this article, depending on the context, a threshold can refer to a value that is 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.

[0195] Although specific combinations of features are set forth in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of aspects. In fact, many of these features can be combined in ways not specifically set forth in the claims and / or disclosed in the specification. While each dependent claim listed below may directly depend on only one claim, the disclosure of aspects includes each dependent claim combined with every other claim in the claim set. As used herein, the phrase “at least one” in the list of items refers to any combination of these items, including single members. As an example, “at least one of a, b, or c” is intended to cover: a, b, c, ab, ac, bc, and abc, and any combination with multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0196] No element, operation, or instruction used herein should be construed as critical or necessary unless explicitly stated otherwise. Furthermore, 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.” Furthermore, as used herein, the article “the” is intended to include one or more items referenced in connection with the article “the” and may be used interchangeably with “one or more.” Furthermore, 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 the intent is to include only one item, the phrase “only one” or similar language is used. Furthermore, as used herein, the terms “having,” “with,” etc., are intended to be open-ended terms. Furthermore, unless explicitly stated otherwise, the phrase “based on” is intended to mean “at least partially based on.” Furthermore, as used herein, the term “or,” when used consecutively, is intended to be inclusive and may be used interchangeably with “and / or” unless explicitly stated otherwise (e.g., if used in conjunction with “any” or “only one”).

Claims

1. A user equipment (UE) for wireless communication, comprising: Memory; as well as One or more processors coupled to the memory, the one or more processors being configured to: Detect radio link faults (RLFs) on the primary cell group (MCG); The state of the secondary cell group (SCG) is determined at least in part based on the RLF on the MCG, wherein the state of the SCG is a deactivated state, a dormant state, or an enhanced dormant state; Activation of the SCG is initiated at least in part based on the state of the SCG, wherein activation of the SCG includes: at least in part based on the detection of the RLF, transmitting MCG fault recovery information on the SCG during random access and preventing the transmission of requests for radio resource control (RRC) reconstruction on the MCG. At least in part, based on sending the MCG fault recovery information, receiving MCG reconnection information on the SCG; and Data is received or transmitted via the SCG until the fault recovery for the MCG is completed.

2. The UE according to claim 1, wherein, The UE is configured for dual connectivity using multiple radio access technology.

3. The UE according to claim 1, wherein, Initiating activation of the SCG includes: The random access procedure is initiated on the primary and secondary cells (PSCell) of the SCG.

4. The UE according to claim 3, wherein, Initiating the random access procedure includes: A random access preamble is sent on the PSCell.

5. The UE according to claim 1, wherein, The one or more processors are further configured to: At least in part, based on initiating activation of the SCG, timing advance (TA) information is received on the SCG.

6. The UE according to claim 1, wherein, The one or more processors are further configured to: The SCG sends the MCG fault recovery information, which is then forwarded to the MCG's master node.

7. The UE according to claim 1, wherein, The state of the SCG is the enhanced sleep state, and further includes: operating according to the enhanced sleep state of the SCG.

8. The UE according to claim 7, wherein, Operating according to the enhanced hibernation state of the SCG includes one or more of the following: Prevent monitoring of the physical downlink control channel on the primary and secondary cells (PSCell) of the SCG; Channel state information (CSI) measurements are performed in the enhanced sleep downlink bandwidth portion (BWP) on the PSCell; Send a CSI report in the physical uplink control channel for the PSCell; Maintain uplink timing alignment with the secondary node in the PSCell; Perform radio resource management measurements on the PSCell; or Prevent the execution of radio link monitoring measurements.

9. The UE according to claim 1, wherein, The state of the SCG is the deactivated state, and the method further includes: performing an operation based on the deactivated state of the SCG.

10. The UE according to claim 9, wherein, Operating according to the deactivation state of the SCG includes one or more of the following: Prevent monitoring of the physical downlink control channel on the primary and secondary cells (PSCell) of the SCG; Prevent channel state information (CSI) measurements from being performed on the PSCell; Prevent uplink communication from being sent on the PSCell; Preventing the maintenance of uplink timing alignment with the secondary node in the PSCell; Perform radio resource management measurements on the PSCell; or Prevent the execution of radio link monitoring measurements.

11. The UE according to claim 1, wherein, The state of the SCG is the sleep state, and the method further includes: performing operations according to the sleep state of the SCG.

12. A method for performing wireless communication by a user equipment (UE), comprising: Detect radio link faults (RLFs) on the primary cell group (MCG); The state of the secondary cell group (SCG) is determined at least in part based on the RLF on the MCG, wherein the state of the SCG is a deactivated state, a dormant state, or an enhanced dormant state; Activation of the SCG is initiated at least in part based on the state of the SCG, wherein activation of the SCG includes: at least in part based on the detection of the RLF, transmitting MCG fault recovery information on the SCG during random access, and preventing the transmission of requests for radio resource control (RRC) reconstruction on the MCG. At least in part, based on sending the MCG fault recovery information, receiving MCG reconnection information on the SCG; and Data is received or transmitted via the SCG until the fault recovery for the MCG is completed.

13. The method according to claim 12, wherein, The UE is configured for dual connectivity using multiple radio access technology.

14. The method according to claim 12, wherein, Initiating activation of the SCG includes initiating the random access procedure on the primary and secondary cells (PSCell) of the SCG.

15. The method according to claim 14, wherein, Initiating the random access procedure includes sending a random access preamble on the PSCell.

16. The method of claim 12, further comprising: At least in part, based on initiating activation of the SCG, timing advance (TA) information is received on the SCG.

17. The method of claim 12, further comprising: The SCG sends the MCG fault recovery information, which is then forwarded to the MCG's master node.

18. The method according to claim 12, wherein, The state of the SCG is the enhanced sleep state, and further includes: operating according to the enhanced sleep state of the SCG.

19. The method according to claim 18, wherein, Operating according to the enhanced hibernation state of the SCG includes one or more of the following: Prevent monitoring of the physical downlink control channel on the primary and secondary cells (PSCell) of the SCG; Channel state information (CSI) measurements are performed in the enhanced sleep downlink bandwidth portion (BWP) on the PSCell; Send a CSI report in the physical uplink control channel for the PSCell; Maintain uplink timing alignment with the secondary node in the PSCell; Perform radio resource management measurements on the PSCell; or Prevent the execution of radio link monitoring measurements.

20. The method according to claim 12, wherein, The state of the SCG is the deactivated state, and the method further includes: performing an operation based on the deactivated state of the SCG.

21. The method of claim 20, wherein operating according to the deactivation state of the SCG comprises one or more of the following: Prevent monitoring of the physical downlink control channel on the primary and secondary cells (PSCell) of the SCG; Prevent channel state information (CSI) measurements from being performed on the PSCell; Prevent uplink communication from being sent on the PSCell; Preventing the maintenance of uplink timing alignment with the secondary node in the PSCell; Perform radio resource management measurements on the PSCell; or Prevent the execution of radio link monitoring measurements.

22. The method according to claim 12, wherein, The state of the SCG is the sleep state, and the method further includes: performing operations according to the sleep state of the SCG.

23. 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 a processor of a user equipment (UE), cause the UE to perform the method according to any one of claims 12-22.

24. An apparatus for wireless communication, comprising a unit for performing the method according to any one of claims 12-22.

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