WO2022005591A1

WO2022005591A1 - Updating an acquisition database for standalone capable cells of a secondary cell group

Info

Publication number: WO2022005591A1
Application number: PCT/US2021/030193
Authority: WO
Inventors: Ansah Ahmed SHEIK; Sayak SAHA; Shanshan Wang
Original assignee: Qualcomm Incorporated
Priority date: 2020-07-03
Filing date: 2021-04-30
Publication date: 2022-01-06

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may read a system information block associated with a cell of a secondary cell group, wherein the UE is configured to communicate via a cell of a primary cell group in dual connectivity mode; and update, based at least in part on a determination that the cell of the secondary cell group is standalone capable, an acquisition database associated with the secondary cell group. Numerous other aspects are provided.

Description

UPDATING AN ACQUISITION DATABASE FOR STANDALONE CAPABLE CELLS OF

A SECONDARY CELL GROUP

CROSS-REFERENCE TO RELATED APPLICATION [0001] This Patent Application claims priority to Indian Provisional Patent Application No. 202041028372, filed on July 3, 2020, entitled “UPDATING AN ACQUISITION DATABASE FOR STANDALONE CAPABLE CELLS OF A SECONDARY CELL GROUP,” and assigned to the assignee hereof. The disclosure of the prior Application is considered part of and is incorporated by reference in this Patent Application.

FIELD OF THE DISCLOSURE

[0002] Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for updating an acquisition database for standalone capable cells of a secondary cell group.

BACKGROUND

[0003] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. 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, and/or the like). Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC- FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE/LTE- Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0004] A wireless network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs). A user equipment (UE) may communicate with a base station (BS) via the downlink and uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the 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, a gNB, an access point (AP), a radio head, a transmit receive point (TRP), a New Radio (NR) BS, a 5G Node B, and/or the like. [0005] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate on a municipal, national, regional, and even global level. New Radio (NR), which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR, and other radio access technologies remain useful.

SUMMARY

[0006] In some aspects, a method of wireless communication performed by a user equipment (UE) includes: reading a system information block (SIB) associated with a cell of a secondary cell group (SCG), wherein the UE is configured to communicate via a cell of a primary cell group (PCG) in dual connectivity mode; and updating, based at least in part on a determination that the cell of the SCG is standalone capable, an acquisition database associated with the SCG. [0007] In some aspects, a UE for wireless communication includes a memory and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: read a SIB associated with a cell of an SCG, wherein the UE is configured to communicate via a cell of a PCG in dual connectivity mode; and update, based at least in part on a determination that the cell of the SCG is standalone capable, an acquisition database associated with the SCG.

[0008] 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 UE, cause the UE to: read a SIB associated with a cell of an SCG, wherein the UE is configured to communicate via a cell of a PCG in dual connectivity mode; and update, based at least in part on a determination that the cell of the SCG is standalone capable, an acquisition database associated with the SCG.

[0009] In some aspects, an apparatus for wireless communication includes: means for reading a SIB associated with a cell of an SCG, wherein the apparatus is configured to communicate via a cell of a PCG in dual connectivity mode; and means for updating, based at least in part on a determination that the cell of the SCG is standalone capable, an acquisition database associated with the SCG.

[0010] Aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the drawings and specification.

[0011] The foregoing has outlined rather broadly the features and technical advantages of examples according to the disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The conception and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. Characteristics of the concepts disclosed herein, both their organization and method of operation, together with associated advantages will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for the purposes of illustration and description, and not as a definition of the limits of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS [0012] So that the above-recited features of the present disclosure can be understood in detail, a more particular description, briefly summarized above, may be had by reference to aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects. The same reference numbers in different drawings may identify the same or similar elements.

[0013] Fig. 1 is a diagram illustrating an example of a wireless network, in accordance with various aspects of the present disclosure.

[0014] Fig. 2 is a diagram illustrating an example of a base station in communication with a UE in a wireless network, in accordance with various aspects of the present disclosure.

[0015] Fig. 3 includes diagrams illustrating examples of voice call recovery, in accordance with various aspects of the present disclosure.

[0016] Figs. 4-7 are diagrams illustrating examples associated with updating an acquisition database for standalone capable cells of a secondary cell group, in accordance with various aspects of the present disclosure. [0017] Fig. 8 is a diagram illustrating an example process associated with updating an acquisition database for standalone capable cells of a secondary cell group, in accordance with various aspects of the present disclosure.

[0018] Fig. 9 is a block diagram of an example apparatus for wireless communication, in accordance with various aspects of the present disclosure.

DETAILED DESCRIPTION

[0019] Various aspects of the disclosure are described more fully hereinafter with reference to the accompanying drawings. This disclosure may, however, be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Based on the teachings herein, one skilled in the art should appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or combined with any other aspect of the disclosure. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method which is practiced using other structure, functionality, or structure and functionality in addition to or other than the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.

[0020] Several aspects of telecommunication systems will now be presented with reference to various apparatuses and techniques. These apparatuses and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, and/or the like (collectively referred to as “elements”). These elements may be implemented using hardware, software, or combinations thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. [0021] It should be noted that while aspects may be described herein using terminology commonly associated with a 5G or NR radio access technology (RAT), aspects of the present disclosure can be applied to other RATs, such as a 3G RAT, a 4G RAT, and/or a RAT subsequent to 5G (e.g., 6G).

[0022] Fig. 1 is a diagram illustrating an example of a wireless network 100, in accordance with various aspects of the present disclosure. The wireless network 100 may be or may include elements of a 5G (NR) network, an LTE network, and/or the like. The wireless network 100 may include a number of base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 1 lOd) and other network entities. A base station (BS) is an entity that communicates with user equipment (UEs) and may also be referred to as an NR BS, a Node B, a gNB, a 5G node B (NB), an access point, a transmit receive point (TRP), and/or the like. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term “cell” can refer to a coverage area of a BS and/or a BS subsystem serving this coverage area, depending on the context in which the term is used.

[0023] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In the example shown in Fig. 1, a BS 110a may be a macro BS for a macro cell 102a, a BS 110b may be a pico BS for a pico cell 102b, and a BS 110c may be a femto BS for a femto cell 102c. A BS may support one or multiple (e.g., three) cells. The terms “eNB”, “base station”, “NR BS”, “gNB”, “TRP”, “AP”, “node B”, “5G NB”, and “cell” may be used interchangeably herein.

[0024] In some aspects, a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS. In some aspects, the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network.

[0025] Wireless network 100 may also include relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. In the example shown in Fig. 1, a relay BS 1 lOd may communicate with macro BS 110a and a UE 120d in order to facilitate communication between BS 110a and UE 120d. A relay BS may also be referred to as a relay station, a relay base station, a relay, and/or the like.

[0026] Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/or the like. These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in wireless network 100. For example, macro BSs may have a high transmit power level (e.g., 5 to 40 watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 watts). [0027] A network controller 130 may couple to a set of BSs and may provide coordination and control for these BSs. Network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with one another directly or indirectly, via a wireless or wireline backhaul.

[0028] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, and/or the like. A UE may be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.

[0029] Some UEs may be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, and/or the like, that may communicate with a base station, another device (e.g., remote device), or some other entity. A wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered Intemet-of-Things (IoT) devices, and/or may be implemented as NB-IoT (narrowband internet of things) devices. Some UEs may be considered a Customer Premises Equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, and/or the like. In some aspects, the processor components and the memory components may be coupled together. For example, the processor components (e.g., one or more processors) and the memory components (e.g., a memory) may be operatively coupled, communicatively coupled, electronically coupled, electrically coupled, and/or the like.

[0030] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a particular RAT and may operate on one or more frequencies. A RAT may also be referred to as a radio technology, an air interface, and/or the like. A frequency may also be referred to as a carrier, a frequency channel, and/or the like.

Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed. [0031] 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 a base station 110 as an intermediary to communicate with one another). For example, the UEs 120 may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to- vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, and/or the like), a mesh network, and/or the like. In this case, the UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by the base station 110.

[0032] Devices of wireless network 100 may communicate using the electromagnetic spectrum, which may be subdivided based on frequency or wavelength into various classes, bands, channels, and/or the like. For example, devices of wireless network 100 may communicate using an operating band having a first frequency range (FR1), which may span from 410 MHz to 7.125 GHz, and/or may communicate using an operating band having a second frequency range (FR2), which may span from 24.25 GHz to 52.6 GHz. The frequencies between FR1 and FR2 are sometimes referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to as a “sub-6 GHz” band. Similarly, FR2 is often referred to as a “millimeter wave” band despite being different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band. Thus, unless specifically stated otherwise, it should be understood that the term “sub-6 GHz” or the like, if used herein, may broadly represent frequencies less than 6 GHz, frequencies within FR1, and/or mid-band frequencies (e.g., greater than 7.125 GHz). Similarly, unless specifically stated otherwise, it should be understood that the term “millimeter wave” or the like, if used herein, may broadly represent frequencies within the EHF band, frequencies within FR2, and/or mid-band frequencies (e.g., less than 24.25 GHz). It is contemplated that the frequencies included in FR1 and FR2 may be modified, and techniques described herein are applicable to those modified frequency ranges.

[0033] As indicated above, Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.

[0034] Fig. 2 is a diagram illustrating an example 200 of a base station 110 in communication with a UE 120 in a wireless network 100, in accordance with various aspects of the present disclosure. Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T > 1 and R > 1 [0035] At base station 110, a transmit processor 220 may receive data from a data source 212 for 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 (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS(s) selected for the UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) and/or the like) and control information (e.g., CQI requests, grants, upper layer signaling, and/or the like) and provide overhead symbols and control symbols. Transmit processor 220 may also generate reference symbols for reference signals (e.g., a cell-specific reference signal (CRS), a demodulation reference signal (DMRS), and/or the like) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS)). A transmit (TX) multiple-input multiple -output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.

[0036] At UE 120, antennas 252a through 252r may receive the downlink signals from base station 110 and/or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM and/or the like) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller/processor 280. The term “controller/processor” may refer to one or more controllers, one or more processors, or a combination thereof. A channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), and/or the like. In some aspects, one or more components of UE 120 may be included in a housing 284.

[0037] Network controller 130 may include communication unit 294, controller/processor 290, and memory 292. Network controller 130 may include, for example, one or more devices in a core network. Network controller 130 may communicate with base station 110 via communication unit 294.

[0038] On the uplink, at UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports that include RSRP, RSSI, RSRQ, CQI, and/or the like) from controller/processor 280. Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, and/or the like), and transmitted to base station 110. In some aspects, the UE 120 includes a transceiver. The transceiver may include any combination of antenna(s) 252, modulators and/or demodulators 254, MIMO detector 256, receive processor 258, transmit processor 264, and/or TX MIMO processor 266. The transceiver may be used by a processor (e.g., controller/processor 280) and memory 282 to perform aspects of any of the methods described herein, for example, as described with reference to Figs. 4-9.

[0039] At base station 110, the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120. Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller/processor 240. Base station 110 may include communication unit 244 and communicate to network controller 130 via communication unit 244. Base station 110 may include a scheduler 246 to schedule UEs 120 for downlink and/or uplink communications. In some aspects, the base station 110 includes a transceiver. The transceiver may include any combination of antenna(s) 234, modulators and/or demodulators 232, MIMO detector 236, receive processor 238, transmit processor 220, and/or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller/processor 240) and memory 242 to perform aspects of any of the methods described herein, for example, as described with reference to Figs. 4-9.

[0040] Controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component(s) of Fig. 2 may perform one or more techniques associated with updating an acquisition database for standalone capable cells of a secondary cell group (SCG), as described in more detail elsewhere herein. For example, controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component(s) of Fig. 2 may perform or direct operations of, for example, process 800 of Fig. 8 and/or other processes as described herein. Memories 242 and 282 may store data and program codes 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, program code, and/or the like) for wireless communication. For example, the one or more instructions, when executed (e.g., directly, or after compiling, converting, interpreting, and/or the like) by one or more processors of the base station 110 and/or the UE 120, may cause the one or more processors, the UE 120, and/or the base station 110 to perform or direct operations of, for example, process 800 of Fig. 8 and/or other processes as described herein. In some aspects, executing instructions may include running the instructions, converting the instructions, compiling the instructions, interpreting the instructions, and/or the like.

[0041] In some aspects, UE 120 may include means for reading a system information block associated with a cell of an SCG, wherein the UE is configured to communicate via a cell of a primary cell group (PCG) in dual connectivity mode; means for updating, based at least in part on a determination that the cell of the SCG is standalone capable, an acquisition database associated with the SCG; and/or the like. In some aspects, such means may include one or more components of UE 120 described in connection with Fig. 2, such as controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and/or the like.

[0042] While blocks in Fig. 2 are illustrated as distinct components, the functions described above with respect to the blocks may be implemented in a single hardware, software, or combination component or in various combinations of components. For example, the functions described with respect to the transmit processor 264, the receive processor 258, and/or the TX MIMO processor 266 may be performed by or under the control of controller/processor 280.

[0043] As indicated above, Fig. 2 is provided as an example. Other examples may differ from what is described with regard to Fig. 2.

[0044] Fig. 3 includes diagrams illustrating examples 300, 310, and 320 of voice call recovery, in accordance with various aspects of the present disclosure. In some aspects, a UE may perform one or more of the examples 300, 310, and 320 of voice call recovery during communication with one or more base stations.

[0045] As shown in example 300, the UE may operate in evolved UMTS terrestrial radio access network (E-UTRAN) New Radio dual connectivity (ENDC) mode in which the UE supports E-UTRAN (e.g., LTE) and/or NR communication. The UE may be in LTE mode and may camp on an available NR capable cell. The UE may begin a voice call in LTE and may experience radio link failure (RLF). Based at least in part on the RLF in LTE, the UE may perform a series of operations to reestablish the voice call before the call fails.

[0046] The UE may scan for a cell in LTE to attempt to connect to another LTE cell. If the UE cannot locate another LTE cell to reestablish the voice call, the UE may attempt to reestablish the voice call on an NR cell that is standalone capable. The UE may scan in NR (e.g., scan for a new cell in NR) using an acquisition database (ADB). The NR cell (e.g., a special cell of an SCG (PScell)) associated with the NR capable cell on which the UE is camped may not be within the acquisition database based at least in part on the UE being in LTE mode. If the UE is unable to identify an available NR cell using a scan that is based at least in part on the acquisition database, the UE may initiate a full band scan. In the full band scan, the UE may search one or more bands for an available NR cell. The UE may identify an available NR cell (e.g., the NR cell associated with the NR capable cell). However, the UE may identify the available NR cell only after a threshold amount of time, and the call may fail based at least in part on a delay in reestablishing the voice call.

[0047] As shown in example 310, the UE may operate in NR dual connectivity (NRDC) mode, in which the UE supports NR communication via a master cell group (MCG) and an SCG. The UE may operate in NRDC based at least in part on a configuration of the UE, unavailability of LTE cell groups, and/or the like. The UE may begin a voice call via a cell of the MCG (e.g., an MCG leg) and may experience RLF in the cell of the MCG. Based at least in part on the RLF in the cell of the MCG, the UE may perform a series of operations to reestablish the voice call before the call fails.

[0048] The UE may scan in NR (e.g., scan for a new cell in NR) using an acquisition database. The UE may begin scanning for a cell (e.g., a PScell) on which the UE most recently camped. However, the acquisition database may include only information from before the voice call, which information may be stale. If the UE is unable to identify an available NR cell using a scan that is based at least in part on the acquisition database, the UE may initiate a full band scan. In the full band scan, the UE may search one or more bands for an available NR cell. The UE may identify an available NR cell. However, the UE may identify the available NR cell after a threshold amount of time, and the call may fail based at least in part on a delay in reestablishing the voice call.

[0049] As shown in example 320, the UE may have no standalone coverage in NR and may instead use LTE. The UE may move into coverage of an NR capable cell and may begin a data call via NR mode ENDC (e.g., using an NR cell (PSscell)). The NR capable cell may support standalone NR, but the UE may remain in ENDC mode. The network may release the NR cell after the data call ends, and the UE may remain connected via LTE of the NR capable cell.

After releasing the NR cell, a higher priority public land mobile network (PLMN) timer may expire in a network access server (NAS). Based at least in part on expiration of the higher priority PLMN timer, the UE may perform a full band scan to search for one or more available NR cells. Based at least in part on finding an NR cell that is standalone capable, the UE may camp on the NR cell.

[0050] As indicated above, Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3. [0051] An NR standalone capable UE does not add a PScell, in ENDC mode or in NRDC mode, to an acquisition database. After RLF, a UE may first perform scans on cells in the acquisition database followed by a full band scan. Based at least in part on not adding a previous NR PScell to the database, the UE may fail to locate and camp on the previous NR PScell soon enough to avoid dropping a call, avoid a delay in moving to higher priority RAT, and/or the like. Additionally, performing a full band scan may consume computing, communication, network, and power resources of the UE.

[0052] In some aspects described herein, a UE may read a system information block (SIB) associated with a PScell while communicating in ENDC mode or NRDC mode. The UE may use information from the SIB to update an acquisition database and/or prioritize the PScell in a subsequent NR scan. In some aspects, the UE may use the acquisition database that has been updated with the information of the SIB to scan for the PScell after RLF of a PCG. In this way, the UE may improve a likelihood of camping on the PScell soon enough to avoid dropping a call, avoid a delay in moving to a higher priority RAT, and/or the like. Additionally, the UE may conserve computing, communication, network, and power resources of the UE that may otherwise be used to perform a full band scan.

[0053] Fig. 4 is a diagram illustrating an example 400 associated with updating an acquisition database for standalone capable cells of an SCG, in accordance with various aspects of the present disclosure. As shown in Fig. 4, one or more base stations (e.g., base station 110) may communicate with a UE (e.g., UE 120). The one or more base stations and the UE may be part of a wireless network (e.g., wireless network 100).

[0054] As shown by reference number 405, the one or more base stations may transmit, and the UE may receive, configuration information. In some aspects, the UE may receive the configuration information from another device (e.g., from another base station, another UE, and/or the like), from a specification of a communication standard, and/or the like. In some aspects, the UE may receive the configuration information via one or more of radio resource control (RRC) signaling, medium access control (MAC) signaling (e.g., MAC control elements (MAC CEs)), and/or the like. In some aspects, the configuration information may include an indication of one or more configuration parameters (e.g., already known to the UE) for selection by the UE, explicit configuration information for the UE to use to configure the UE, and/or the like.

[0055] In some aspects, the configuration information may indicate that the UE is to read a SIB associated with a PScell while communicating in ENDC mode or NRDC mode. The configuration information may indicate that the UE may use information from the SIB to update an acquisition database and/or prioritize the PScell in a subsequent NR scan. In some aspects, the configuration information may indicate that the UE may use the acquisition database that has been updated with the information of the SIB to scan for the PScell after RLF of a PCG. [0056] As shown by reference number 410, the UE may configure the UE for communicating with the one or more base stations. In some aspects, the UE may configure the UE based at least in part on the configuration information. In some aspects, the UE may be configured to perform one or more operations described herein.

[0057] As shown by reference number 415, the UE and the one or more base stations may communicate via a cell of a PCG. In some aspects, the UE may communicate via the cell of the PCG based at least in part on a determination that an SCG is unavailable. For example, the UE may communicate with an LTE cell based at least in part on an NR SCG being unavailable. [0058] As shown by reference number 420, the UE may receive a SIB associated with a cell of an SCG. In some aspects, the UE may determine that the cell of the SCG is available based at least in part on receiving the SIB. In some aspects, the SIB may include a SIB1. In some aspects, the SIB may identify resources and/or parameters to receive one or more additional SIBs that include additional system information. For example, the SIB may identify resources and/or parameters to receive a SIB3 and/or a SIB4 that include information for neighbor cells of the cell of the SCG.

[0059] In some aspects, the PCG may be associated with a first RAT (e.g., LTE) and the SCG may be associated with a second RAT (e.g., NR). In some aspects, the PCG and the SCG may be associated with a same RAT (e.g., NR). The UE may be configured to operate in a dual connectivity mode, such as ENDC mode, NRDC mode, and/or the like.

[0060] As shown by reference number 425, the UE may read the SIB that is associated with the cell of the SCG. In some aspects, the UE may read one or more SIBs (e.g., a SIB1, a SIB3, a SIB4, and/or the like) to determine information associated with the cell of the SCG and/or neighbor cells of the SCG.

[0061] In some aspects, the UE may be configured with a timeout counter for attempting to read the SIB associated with the cell of the SCG. For example, the UE may be configured to iteratively attempt to read occasions of the SIB for a first amount of time (e.g., 640 milliseconds), with attempts separated by a second amount of time (e.g., 2 seconds). In some aspects, the UE may increment a count of the timeout counter before or after each iterative attempt to read the occasions of the SIB. Based at least in part on the timeout counter satisfying a timeout counter threshold (e.g., reaching a maximum number of attempts), the UE may temporarily cease attempting to read occasions of the SIB. For example, after 5 attempts, the UE may cease attempting to read occasions of the SIB for 120 seconds. Based at least in part on expiration of a timeout period, the UE may again iteratively attempt to read occasions of the SIB. [0062] As shown by reference number 430, the UE may determine whether the cell of the SCG is standalone capable and/or update an acquisition database. In some aspects, the UE may determine that the cell of the SCG is standalone capable based at least in part on information of the SIB. In some aspects, the UE may determine that one or more neighbor cells are standalone capable based at least in part on one or more additional SIBs.

[0063] In some aspects, the UE may determine whether the cell of the SCG or a neighbor cell is standalone capable based at least in part on the SIB or one or more additional SIBs indicating one or more portions of system information that are associated with standalone capability. For example, the SIB or one or more additional SIBs may indicate a tracking area code, a common configuration, and/or the like.

[0064] In some aspects, the UE may add information associated with the SIB to the acquisition database (e.g., based at least in part on determining that the cell of the SCG or a neighbor cell is standalone capable. For example, the UE may add the cell of the SCG (e.g., adding information for locating the cell during a scan) and/or a neighbor cell to the acquisition database. In some aspects, the UE may prioritize the cell of the SCG within the acquisition database. In some aspects, the priority of cells within the acquisition database indicates an order for scanning for the cells. In other words, the UE may prioritize the cell of the SCG within the acquisition database such that the UE will search first for the cell of the SCG or a neighbor cell that is standalone capable when performing a scan.

[0065] As shown by reference number 435, the UE may determine an RLF of the cell of the PCG and scan the SCG using the acquisition database. For example, based at least in part on determining the RLF of the cell of the PCG, the UE may scan the SCG for a cell connection based at least in part on the acquisition database. In some aspects, scanning the SCG for the cell connection may include scanning the SCG for the cell of the SCG and/or one or more neighbor cells.

[0066] As shown by reference number 440, the UE may establish a connection with the cell of the SCG. In some aspects, establishing the connection with the cell of the SCG includes performing a redirection operation (e.g., based at least in part on performing a local release of the cell of the PCG). In some aspects, establishing the connection with the cell of the SCG includes registering the UE with the cell of the SCG. In some aspects, establishing the connection with the cell of the SCG includes synchronizing the UE with the cell of the SCG. [0067] Based at least in part on using the acquisition database that has been updated with the information of the SIB to scan for the cell of the SCG after RLF of the cell of the PCG, the UE may improve a likelihood of camping on the cell of the SCG soon enough to avoid dropping a call, avoid a delay in moving to a higher priority RAT, and/or the like. Additionally, the UE may conserve computing, communication, network, and power resources of the UE that may otherwise be used to perform a full band scan after failing to locate a cell of the SCG using stale information of the acquisition database.

[0068] As indicated above, Fig. 4 is provided as an example. Other examples may differ from what is described with regard to Fig. 4.

[0069] Fig. 5 is a diagram illustrating an example 500 associated with updating an acquisition database for standalone capable cells of an SCG, in accordance with various aspects of the present disclosure. In some aspects, a UE (e.g., UE 120) may perform one or more operations of example 500 during communication with one or more base stations (e.g., base station 110). The UE and the one or more base stations may be included in one or more wireless networks (e.g., wireless network 100).

[0070] As shown in example 500, the UE may operate in ENDC mode, in which the UE supports E-UTRAN (e.g., LTE) and/or NR communication. The UE may be in LTE mode and may camp on an available NR capable cell. The UE may read a SIB1 associated with an NR PScell even when the UE is in LTE mode. The UE may determine whether the NR PScell is standalone capable based at least in part on the SIB 1. For example, the UE may determine whether the SIB1 includes indications of parameters associated with standalone capability (e.g., a tracking area code, a common configuration, and/or the like).

[0071] Based at least in part on the NR PScell being standalone capable, the UE may add the NR PScell to an NR acquisition database and/or update the NR PScell within the acquisition database (e.g., prioritize the NR PScell).

[0072] The UE may begin a voice call in LTE and may experience radio link failure (RLF). Based at least in part on the RLF in LTE, the UE may perform a series of operations to reestablish the voice call before the call fails. The UE may scan in LTE to attempt to connect to another LTE cell. If the UE cannot locate another LTE cell to reestablish the voice call, the UE may attempt to reestablish the voice call on an NR cell that is standalone capable.

[0073] The UE may scan for an NR cell using the acquisition database having the NR PScell added and/or having updated information for the NR PScell. Based at least in part on the acquisition database having the NR PScell added and/or having updated information for the NR PScell, the UE may find the NR PScell soon enough to recover the voice call before dropping occurs.

[0074] As indicated above, Fig. 5 is provided as an example. Other examples may differ from what is described with regard to Fig. 5.

[0075] Fig. 6 is a diagram illustrating an example 600 associated with updating an acquisition database for standalone capable cells of an SCG, in accordance with various aspects of the present disclosure. In some aspects, a UE (e.g., UE 120) may perform one or more operations of example 600 during communication with one or more base stations (e.g., base station 110). The UE and the one or more base stations may be included in one or more wireless networks (e.g., wireless network 100).

[0076] As shown in example 600, the UE may operate in NRDC mode, in which the UE supports NR communication via an MCG and an SCG. The UE may read a SIB 1 associated with an NR PScell of the SCG even when the UE is communicating via the MCG. The UE may determine whether the NR PScell is standalone capable based at least in part on the SIB 1. For example, the UE may determine whether the SIB 1 includes indications of parameters associated with standalone capability (e.g., a tracking area code, a common configuration, and/or the like). [0077] Based at least in part on the NR PScell being standalone capable, the UE may add the NR PScell to an NR acquisition database and/or update the NR PScell within the acquisition database (e.g., prioritize the NR PScell).

[0078] The UE may begin a voice call via a cell of the MCG (e.g., an MCG leg) and may experience RLF in the cell of the MCG. Based at least in part on the RLF in the cell of the MCG, the UE may perform a series of operations to reestablish the voice call before the call fails.

[0079] The UE may scan for an NR cell using the acquisition database having the NR PScell added and/or having updated information for the NR PScell. Based at least in part on the acquisition database having the NR PScell added and/or having updated information for the NR PScell, the UE may find the NR PScell soon enough to recover the voice call before dropping occurs.

[0080] As indicated above, Fig. 6 is provided as an example. Other examples may differ from what is described with regard to Fig. 6.

[0081] Fig. 7 is a diagram illustrating an example 700 associated with updating an acquisition database for standalone capable cells of an SCG, in accordance with various aspects of the present disclosure. In some aspects, a UE (e.g., UE 120) may perform one or more operations of example 700 during communication with one or more base stations (e.g., base station 110). The UE and the one or more base stations may be included in one or more wireless networks (e.g., wireless network 100).

[0082] As shown in example 700, the UE may have no standalone coverage in NR and may instead use LTE. The UE may move into coverage of an NR capable cell and may begin a data call via NR mode ENDC (e.g., using an NR cell (PSscell)). The UE may read a SIB1 associated with an NR PScell of an SCG even when the UE is communicating via the MCG. The UE may determine whether the NR PScell is standalone capable based at least in part on the SIB 1. For example, the UE may determine whether the SIB 1 includes indications of parameters associated with standalone capability (e.g., a tracking area code, a common configuration, and/or the like). [0083] Based at least in part on the NR PScell being standalone capable, the UE may add the NR PScell to an NR acquisition database and/or update the NR PScell within the acquisition database (e.g., prioritize the NR PScell).

[0084] The network may release the NR cell after the data call ends, and the UE may remain connected via LTE of the NR capable cell. The UE may perform a local release in LTE and may perform a redirection process to move to NR via an LTE-to-NR redirection process. In some aspects, the UE may scan in NR (e.g., scan for a new cell in NR) with priority to added and/or updated NR PScells during the voice call (e.g., the NR PScell and/or neighbor cells).

The UE may establish a connection with the NR PScell including registering the UE on the NR PScell to synchronize with the network. Based at least in part on the acquisition database having the NR PScell added and/or having updated information for the NR PScell, the UE may find the NR PScell without performing a full band scan.

[0085] As indicated above, Fig. 7 is provided as an example. Other examples may differ from what is described with regard to Fig. 7.

[0086] Fig. 8 is a diagram illustrating an example process 800 performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 800 is an example where the UE (e.g., UE 120 and/or the like) performs operations associated with updating an acquisition database for standalone capable cells of an SCG.

[0087] As shown in Fig. 8, in some aspects, process 800 may include reading a SIB associated with a cell of an SCG, wherein the UE is configured to communicate via a cell of a PCG in dual connectivity mode (block 810). For example, the UE (e.g., using receive processor 258, controller/processor 280, memory 282, and/or the like) may read a SIB associated with a cell of an SCG, as described above. In some aspects, the UE is configured to communicate via a cell of a PCG in dual connectivity mode.

[0088] As further shown in Fig. 8, in some aspects, process 800 may include updating, based at least in part on a determination that the cell of the SCG is standalone capable, an acquisition database associated with the SCG (block 820). For example, the UE (e.g., using controller/processor 280, memory 282, and/or the like) may update, based at least in part on a determination that the cell of the SCG is standalone capable, an acquisition database associated with the SCG, as described above.

[0089] Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.

[0090] In a first aspect, process 800 includes determining that the cell of the SCG is standalone capable based at least in part on information of the SIB. [0091] In a second aspect, alone or in combination with the first aspect, determining that the cell of the SCG is standalone capable based at least in part on the SIB includes determining that the cell of the SCG is standalone capable based at least in part on the SIB indicating one or more of: a tracking area code, or a common configuration.

[0092] In a third aspect, alone or in combination with one or more of the first and second aspects, updating the acquisition database associated with the SCG includes one or more of adding information associated with the SIB to the acquisition database, or prioritizing the cell of the SCG within the acquisition database, wherein a priority of cells within the acquisition database indicates an order for scanning for the cells.

[0093] In a fourth aspect, alone or in combination with one or more of the first through third aspects, process 800 includes determining an RLF of the cell of the PCG and scanning the SCG for a cell connection based at least in part on the acquisition database.

[0094] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, scanning the SCG for the cell connection based at least in part on the acquisition database includes scanning the SCG for the cell of the SCG.

[0095] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the PCG is associated with a first RAT and the SCG is associated with a second RAT. [0096] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the PCG and the SCG are associated with a same RAT.

[0097] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, process 800 includes communicating via the cell of the PCG based at least in part on a determination that the SCG is unavailable; determining that the SCG is available; performing, based at least in part on completion of the communication, a local release of the cell of the PCG; and establishing a connection with the cell of the SCG based at least in part on the acquisition database.

[0098] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, establishing the connection with the cell of the SCG includes one or more of: performing a redirection operation based at least in part on performing the local release of the cell of the PCG, registering the UE with the cell of the SCG, or synchronizing the UE with the cell of the SCG.

[0099] In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, reading the SIB associated with the cell of the SCG includes iteratively performing, for a first amount of time, attempts to read occasions of the SIB, wherein the attempts are separated by a second amount of time; suspending, based at least in part on a number of iterations satisfying a maximum iterations threshold, iteratively performing the attempts to read occasions of the SIB; and resuming, after a third amount of time, iteratively performing the attempts to read occasions of the SIB.

[0100] In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, process 800 includes reading one or more additional SIBs associated with the cell of the SCG, wherein the one or more additional system information blocks indicate information associated with neighbor cells of the cell of the SCG.

[0101] Although Fig. 8 shows example blocks of process 800, in some aspects, process 800 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 8. Additionally, or alternatively, two or more of the blocks of process 800 may be performed in parallel.

[0102] Fig. 9 is a block diagram of an example apparatus 900 for wireless communication. The apparatus 900 may be a UE, or a UE may include the apparatus 900. In some aspects, the apparatus 900 includes a reception component 902 and a transmission component 904, which may be in communication with one another (for example, via one or more buses and/or one or more other components). As shown, the apparatus 900 may communicate with another apparatus 906 (such as a UE, a base station, or another wireless communication device) using the reception component 902 and the transmission component 904. As further shown, the apparatus 900 may include one or more of a read component 908, or an update component 910, among other examples.

[0103] In some aspects, the apparatus 900 may be configured to perform one or more operations described herein in connection with Figs. 4-7. Additionally or alternatively, the apparatus 900 may be configured to perform one or more processes described herein, such as process 800 of Fig. 8. In some aspects, the apparatus 900 and/or one or more components shown in Fig. 9 may include one or more components of the UE described above in connection with Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 9 may be implemented within one or more components described above in connection with Fig. 2. Additionally or alternatively, one or more components of the set of components may be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or a processor to perform the functions or operations of the component.

[0104] The reception component 902 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 906. The reception component 902 may provide received communications to one or more other components of the apparatus 900. In some aspects, the reception component 902 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples), and may provide the processed signals to the one or more other components of the apparatus 906. In some aspects, the reception component 902 may include one or more antennas, a demodulator, a MIMO detector, a receive processor, a controller/processor, a memory, or a combination thereof, of the UE described above in connection with Fig. 2.

[0105] The transmission component 904 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 906. In some aspects, one or more other components of the apparatus 906 may generate communications and may provide the generated communications to the transmission component 904 for transmission to the apparatus 906. In some aspects, the transmission component 904 may perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples), and may transmit the processed signals to the apparatus 906. In some aspects, the transmission component 904 may include one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller/processor, a memory, or a combination thereof, of the UE described above in connection with Fig. 2. In some aspects, the transmission component 904 may be co-located with the reception component 902 in a transceiver.

[0106] In some aspects, the reception component 902 may receive a SIB associated with a cell of an SCG while the UE communicates via a cell of a PCG. The read component 908 may read the SIB and/or determine whether the cell of the SCG is standalone capable. Based at least in part on a determination that the cell of the SCG is standalone capable, the update component 910 may update an acquisition database associated with the SCG. For example, the update component 910 may add the cell of the SCG to the acquisition database, update information associated with the cell of the SCG within the database, change a priority of the cell of the SCG within the database, and/or the like.

[0107] The number and arrangement of components shown in Fig. 9 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 9. Furthermore, two or more components shown in Fig. 9 may be implemented within a single component, or a single component shown in Fig. 9 may be implemented as multiple, distributed components. Additionally or alternatively, a set of (one or more) components shown in Fig. 9 may perform one or more functions described as being performed by another set of components shown in Fig. 9.

[0108] The following provides an overview of some Aspects of the present disclosure: [0109] Aspect 1 : A method of wireless communication performed by a user equipment (UE), comprising: reading a system information block associated with a cell of a secondary cell group, wherein the UE is configured to communicate via a cell of a primary cell group in dual connectivity mode; and updating, based at least in part on a determination that the cell of the secondary cell group is standalone capable, an acquisition database associated with the secondary cell group.

[0110] Aspect 2: The method of Aspect 1, further comprising: determining that the cell of the secondary cell group is standalone capable based at least in part on information of the system information block.

[0111] Aspect 3 : The method of Aspect 2, wherein determining that the cell of the secondary cell group is standalone capable based at least in part on the system information block comprises: determining that the cell of the secondary cell group is standalone capable based at least in part on the system information block indicating one or more of: a tracking area code, or a common configuration.

[0112] Aspect 4: The method of any of Aspects 1-3, wherein updating the acquisition database associated with the secondary cell group comprises one or more of: adding information associated with the system information block to the acquisition database, or prioritizing the cell of the secondary cell group within the acquisition database, wherein a priority of cells within the acquisition database indicates an order for scanning for the cells.

[0113] Aspect 5: The method of any of Aspects 1-4, further comprising: determining a radio link failure of the cell of the primary cell group; and scanning the secondary cell group for a cell connection based at least in part on the acquisition database.

[0114] Aspect 6: The method of Aspect 5, wherein scanning the secondary cell group for the cell connection based at least in part on the acquisition database comprises: scanning the secondary cell group for the cell of the secondary cell group.

[0115] Aspect 7: The method of any of Aspects 1-6, wherein the primary cell group is associated with a first radio access technology, and wherein the secondary cell group is associated with a second radio access technology.

[0116] Aspect 8: The method of any of Aspects 1-7, wherein the primary cell group and the secondary cell group are associated with a same radio access technology.

[0117] Aspect 9: The method of any of Aspects 1-8, further comprising: communicating via the cell of the primary cell group based at least in part on a determination that the secondary cell group is unavailable; determining that the secondary cell group is available; performing, based at least in part on completion of the communication, a local release of the cell of the primary cell group; and establishing a connection with the cell of the secondary cell group based at least in part on the acquisition database. [0118] Aspect 10: The method of Aspect 9, wherein establishing the connection with the cell of the secondary cell group comprises one or more of: performing a redirection operation based at least in part on performing the local release of the cell of the primary cell group, registering the UE with the cell of the secondary cell group, or synchronizing the UE with the cell of the secondary cell group.

[0119] Aspect 11: The method of any of Aspects 1-10, wherein reading the system information block associated with the cell of the secondary cell group comprises: iteratively performing, for a first amount of time, attempts to read occasions of the system information block, wherein the attempts are separated by a second amount of time, suspending, based at least in part on a number of iterations satisfying a maximum iterations threshold, iteratively performing the attempts to read occasions of the system information block, and resuming, after a third amount of time, iteratively performing the attempts to read occasions of the system information block.

[0120] Aspect 12: The method of any of Aspects 1-11, further comprising: reading one or more additional system information blocks associated with the cell of the secondary cell group, wherein the one or more additional system information blocks indicate information associated with neighbor cells of the cell of the secondary cell group.

[0121] Aspect 13: An apparatus for wireless communication at a device, comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of one or more Aspects of Aspects 1-12.

[0122] Aspect 14: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors configured to perform the method of one or more Aspects of Aspects 1-12.

[0123] Aspect 15: An apparatus for wireless communication, comprising at least one means for performing the method of one or more Aspects of Aspects 1-12.

[0124] Aspect 16: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more Aspects of Aspects 1-12.

[0125] Aspect 17: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more Aspects of Aspects 1-12.

[0126] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise form disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the aspects. [0127] As used herein, the term “component” is intended to be broadly construed as hardware, firmware, and/or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, and/or a combination of hardware and software. It will be apparent that systems and/or methods described herein may be implemented in different forms of hardware, firmware, and/or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems and/or methods is not limiting of the aspects. Thus, the operation and behavior of the systems and/or methods were described herein without reference to specific software code — it being understood that software and hardware can be designed to implement the systems and/or methods based, at least in part, on the description herein.

[0128] As used herein, satisfying a threshold may, depending on the context, refer to a value being 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, and/or the like.

[0129] Even though particular combinations of features are recited in the claims and/or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features may be combined in ways not specifically recited in the claims and/or disclosed in the specification. Although each dependent claim listed below may directly depend on only one claim, the disclosure of various aspects includes each dependent claim in combination with every other claim in the claim set. A phrase referring to “at least one of’ a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c).

[0130] No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles “a” and “an” are intended to include one or more items and may be used interchangeably with “one or more.” Further, as used herein, the article “the” is intended to include one or more items referenced in connection with the article “the” and may be used interchangeably with “the 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, a combination of related and unrelated items, and/or the like), and may be used interchangeably with “one or more.” Where only one item is intended, the phrase “only one” or similar language is used. Also, as used herein, the terms “has,” “have,” “having,” and/or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise. Also, as used herein, the term “or” is intended to be inclusive when used in a series and may be used interchangeably with “and/or,” unless explicitly stated otherwise (e.g., if used in combination with “either” or “only one of’).

Claims

WHAT IS CLAIMED IS:

1. A method of wireless communication performed by a user equipment (UE), comprising: reading a system information block associated with a cell of a secondary cell group, wherein the UE is configured to communicate via a cell of a primary cell group in dual connectivity mode; and updating, based at least in part on a determination that the cell of the secondary cell group is standalone capable, an acquisition database associated with the secondary cell group.

2. The method of claim 1, further comprising: determining that the cell of the secondary cell group is standalone capable based at least in part on information of the system information block.

3. The method of claim 2, wherein determining that the cell of the secondary cell group is standalone capable based at least in part on the system information block comprises: determining that the cell of the secondary cell group is standalone capable based at least in part on the system information block indicating one or more of: a tracking area code, or a common configuration.

4. The method of claim 1, wherein updating the acquisition database associated with the secondary cell group comprises one or more of: adding information associated with the system information block to the acquisition database, or prioritizing the cell of the secondary cell group within the acquisition database, wherein a priority of cells within the acquisition database indicates an order for scanning for the cells.

5. The method of claim 1, further comprising: determining a radio link failure of the cell of the primary cell group; and scanning the secondary cell group for a cell connection based at least in part on the acquisition database.

6. The method of claim 5, wherein scanning the secondary cell group for the cell connection based at least in part on the acquisition database comprises: scanning the secondary cell group for the cell of the secondary cell group.

7. The method of claim 1, wherein the primary cell group is associated with a first radio access technology, and wherein the secondary cell group is associated with a second radio access technology.

8. The method of claim 1, wherein the primary cell group and the secondary cell group are associated with a same radio access technology.

9. The method of claim 1, further comprising: communicating via the cell of the primary cell group based at least in part on a determination that the secondary cell group is unavailable; determining that the secondary cell group is available; performing, based at least in part on completion of the communication, a local release of the cell of the primary cell group; and establishing a connection with the cell of the secondary cell group based at least in part on the acquisition database.

10. The method of claim 9, wherein establishing the connection with the cell of the secondary cell group comprises one or more of: performing a redirection operation based at least in part on performing the local release of the cell of the primary cell group, registering the UE with the cell of the secondary cell group, or synchronizing the UE with the cell of the secondary cell group.

11. The method of claim 1, wherein reading the system information block associated with the cell of the secondary cell group comprises: iteratively performing, for a first amount of time, attempts to read occasions of the system information block, wherein the attempts are separated by a second amount of time, suspending, based at least in part on a number of iterations satisfying a maximum iterations threshold, iteratively performing the attempts to read occasions of the system information block, and resuming, after a third amount of time, iteratively performing the attempts to read occasions of the system information block.

12. The method of claim 1, further comprising: reading one or more additional system information blocks associated with the cell of the secondary cell group, wherein the one or more additional system information blocks indicate information associated with neighbor cells of the cell of the secondary cell group.

13. A user equipment (UE) for wireless communication, comprising: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: read a system information block associated with a cell of a secondary cell group, wherein the UE is configured to communicate via a cell of a primary cell group in dual connectivity mode; and update, based at least in part on a determination that the cell of the secondary cell group is standalone capable, an acquisition database associated with the secondary cell group.

14. The UE of claim 13, wherein the one or more processors are further configured to: determine that the cell of the secondary cell group is standalone capable based at least in part on information of the system information block.

15. The UE of claim 14, wherein the one or more processors, when determining that the cell of the secondary cell group is standalone capable based at least in part on the system information block, are configured to: determine that the cell of the secondary cell group is standalone capable based at least in part on the system information block indicating one or more of: a tracking area code, or a common configuration.

16. The UE of claim 13, wherein the one or more processors, when updating the acquisition database associated with the secondary cell group, are configured to: add information associated with the system information block to the acquisition database, or prioritize the cell of the secondary cell group within the acquisition database, wherein a priority of cells within the acquisition database indicates an order for scanning for the cells.

17. The UE of claim 13, wherein the one or more processors are further configured to: determine a radio link failure of the cell of the primary cell group; and scan the secondary cell group for a cell connection based at least in part on the acquisition database.

18. The UE of claim 17, wherein the one or more processors, when scanning the secondary cell group for the cell connection based at least in part on the acquisition database, are configured to: scan the secondary cell group for the cell of the secondary cell group.

19. The UE of claim 13, wherein the primary cell group is associated with a first radio access technology, and wherein the secondary cell group is associated with a second radio access technology.

20. The UE of claim 13, wherein the primary cell group and the secondary cell group are associated with a same radio access technology.

21. The UE of claim 13, wherein the one or more processors are further configured to: communicate via the cell of the primary cell group based at least in part on a determination that the secondary cell group is unavailable; determine that the secondary cell group is available; perform, based at least in part on completion of the communication, a local release of the cell of the primary cell group; and establish a connection with the cell of the secondary cell group based at least in part on the acquisition database.

22. The UE of claim 21, wherein the one or more processors, when establishing the connection with the cell of the secondary cell group, are configured to: perform a redirection operation based at least in part on performing the local release of the cell of the primary cell group, register the UE with the cell of the secondary cell group, or synchronize the UE with the cell of the secondary cell group.

23. The UE of claim 13, wherein the one or more processors, when reading the system information block associated with the cell of the secondary cell group, are configured to: iteratively perform, for a first amount of time, attempts to read occasions of the system information block, wherein the attempts are separated by a second amount of time, suspend, based at least in part on a number of iterations satisfying a maximum iterations threshold, iteratively performing the attempts to read occasions of the system information block, and resume, after a third amount of time, iteratively performing the attempts to read occasions of the system information block.

24. The UE of claim 13, wherein the one or more processors are further configured to: read one or more additional system information blocks associated with the cell of the secondary cell group, wherein the one or more additional system information blocks indicate information associated with neighbor cells of the cell of the secondary cell group.

25. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising: one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to: read a system information block associated with a cell of a secondary cell group, wherein the UE is configured to communicate via a cell of a primary cell group in dual connectivity mode; and update, based at least in part on a determination that the cell of the secondary cell group is standalone capable, an acquisition database associated with the secondary cell group.

26. The non-transitory computer-readable medium of claim 25, wherein the one or more instructions further cause the UE to: determine that the cell of the secondary cell group is standalone capable based at least in part on information of the system information block.

27. The non-transitory computer-readable medium of claim 26, wherein the one or more instructions, that cause the UE to determine that the cell of the secondary cell group is standalone capable based at least in part on the system information block, cause the UE to: determine that the cell of the secondary cell group is standalone capable based at least in part on the system information block indicating one or more of: a tracking area code, or a common configuration.

28. An apparatus for wireless communication, comprising: means for reading a system information block associated with a cell of a secondary cell group, wherein the apparatus is configured to communicate via a cell of a primary cell group in dual connectivity mode; and means for updating, based at least in part on a determination that the cell of the secondary cell group is standalone capable, an acquisition database associated with the secondary cell group.

29. The apparatus of claim 28, further comprising: means for determining that the cell of the secondary cell group is standalone capable based at least in part on information of the system information block.

30. The apparatus of claim 29, wherein the means for determining that the cell of the secondary cell group is standalone capable based at least in part on the system information block comprises: means for determining that the cell of the secondary cell group is standalone capable based at least in part on the system information block indicating one or more of: a tracking area code, or a common configuration.