Radio frequency band scanning for multiple subscriber identity modules

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) can perform, at a first subscription of the UE, a first scan procedure for a first set of radio frequency bands according to a default scan order, store an indication of a subset of radio frequency bands of the first set of radio frequency bands for the first scan procedure, and perform, based on the stored indication of the subset of radio frequency bands, a second scan procedure for a second set of radio frequency bands according to a modified scan order. In some cases, the UE can determine a relevance of the stored indication of the subset of radio frequency bands of the first set of radio frequency bands, and determine the modified scan order based on the relevance of the stored indication.

Description

[0001] Cross-referencing

[0002] This patent application claims the benefit of Indian Provisional Patent Application No. 202041043641 entitled “RADIO FREQUENCYBAND SCANNING FOR MULTIPLE SUBSCRIBER IDENTIFICATION MODULES”, filed on October 7, 2020, which has been assigned to the assignee of this application and is expressly incorporated herein by reference. Technical Field

[0003] The following relates to wireless communication, including radio frequency band scanning for a multi-subscriber identification module (SIM). Background Technology

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, message sending and receiving, broadcasting, and so on. These systems can support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth-generation (4G) systems (such as Long Term Evolution (LTE) systems, LTE-A Advanced (LTE-A) systems, or LTE-A Pro systems) and fifth-generation (5G) systems, which may be referred to as New Radio (NR) systems. These systems can employ various technologies, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication from multiple communication devices, which may also be referred to as User Equipment (UE).

[0005] In some cases, the UE may be configured with multiple subscription or multiple subscriber identity modules (SIMs), and the UE may execute multiple scanning procedures corresponding to these multiple subscriptions or SIMs. Furthermore, the UE may perform redundant frequency band scanning, which may reduce battery life and degrade the user experience. Summary of the Invention

[0006] The described technology relates to improved methods, systems, devices, and apparatuses for supporting radio frequency band scanning for multiple subscriber identification modules (SIMs). Generally, the described technology provides reduced signal acquisition time, increased battery life, and enhanced user experience. For example, user equipment (UE) can use band scanning information from a first scanning procedure to improve the speed of a second scanning procedure.

[0007] For example, at its first subscription point, the UE may execute a first scan procedure on a first set of radio frequency bands according to a default scan order, store indications of radio frequency band subsets of the first set of radio frequency bands used for the first scan procedure, and execute a second scan procedure on a second set of radio frequency bands according to a modified scan order based on the stored indications of those radio frequency band subsets. In some cases, the UE may determine the relevance of the stored indications of radio frequency band subsets of the first set of radio frequency bands and determine the modified scan order based on that relevance.

[0008] A method for wireless communication at a UE is described. The method may include: at a first subscription of the UE, performing a first scan procedure on a first set of radio frequency bands according to a default scan order, storing an indication of a subset of radio frequency bands of the first set of radio frequency bands for the first scan procedure, and performing a second scan procedure on a second set of radio frequency bands according to a modified scan order based on the stored indication of the subset of radio frequency bands.

[0009] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. These instructions may be executable by the processor to cause the apparatus to: at a first subscription of the UE, perform a first scan procedure on a first set of radio frequency bands according to a default scan order; store indications of a subset of radio frequency bands in the first set of radio frequency bands for the first scan procedure; and perform a second scan procedure on a second set of radio frequency bands according to a modified scan order based on the stored indications of the subset of radio frequency bands.

[0010] Another device for wireless communication at a UE is described. The device may include means for: performing a first scan procedure on a first set of radio frequency bands according to a default scan order at a first subscription of the UE; storing indications of a subset of radio frequency bands in the first set of radio frequency bands for the first scan procedure; and performing a second scan procedure on a second set of radio frequency bands according to a modified scan order based on the stored indications of the subset of radio frequency bands.

[0011] A non-transient computer-readable medium is described, storing code for wireless communication at a UE. The code may include instructions executable by a processor to perform: at a first subscription of the UE, executing a first scan procedure on a first set of radio frequency bands according to a default scan order; storing an indication of a subset of radio frequency bands in the first set of radio frequency bands for the first scan procedure; and executing a second scan procedure on a second set of radio frequency bands according to a modified scan order based on the stored indication of the subset of radio frequency bands.

[0012] In some examples of the methods, apparatus, and non-transient computer-readable media described herein, performing the second scan procedure may include operations, features, means, or instructions for: determining the relevance of a stored indication of a subset of the first radio frequency band set, and determining the modified scan order based on the relevance of the stored indication.

[0013] In some examples of the methods, apparatuses, and nontransient computer-readable media described herein, determining the relevance of the stored indication of a subset of the first radio frequency bands may include operations, features, means, or instructions for identifying the time difference between the first scan procedure and the second scan procedure, the location of the first scan procedure and the location of the second scan procedure, or a combination thereof.

[0014] In some examples of the methods, apparatus, and non-transient computer-readable media described herein, the execution of the second scan procedure may include operations, features, means, or instructions for: determining that the second scan procedure begins within a first time threshold from the end of the first scan procedure, and skipping the radio frequency band subset of the first radio frequency band set based on the instruction to the radio frequency band subset.

[0015] In some examples of the methods, apparatus, and non-transient computer-readable media described herein, performing the second scan procedure may include operations, features, means, or instructions for: determining that the second scan procedure begins within a second time threshold from the end of the first scan procedure; and determining the modified scan order based on the indication of the radio frequency band subset by prioritizing scans of radio frequency bands in the second radio frequency band set that may be different from the radio frequency band subset of the first radio frequency band set.

[0016] Some examples of the methods, apparatuses, and non-transient computer-readable media described herein may further include operations, features, means, or instructions for configuring a first timer length for a first timer and a second timer length for a second timer, wherein the first timer length may be shorter than the second timer length.

[0017] In some examples of the methods, apparatus, and non-transient computer-readable media described herein, determining that the second scan procedure begins within a first time threshold may include operations, features, means, or instructions for determining that the first timer may be active.

[0018] In some examples of the methods, apparatus, and non-transient computer-readable media described herein, determining that the second scan procedure begins within the second time threshold may include operations, features, means, or instructions for determining that the second timer may be active.

[0019] Some examples of the methods, apparatus, and non-transient computer-readable media described herein may further include operations, features, means, or instructions for activating a first timer and performing the second scan procedure based on the activation of the first timer.

[0020] In some examples of the methods, apparatus, and non-transient computer-readable media described herein, the subset of radio frequency bands of the first radio frequency band set corresponds to the radio frequency band scanned during the first scan procedure.

[0021] Some examples of the methods, apparatus, and non-transient computer-readable media described herein may further include operations, features, means, or instructions for occupying a first radio frequency of the first radio frequency band set based on the first scan procedure, and occupying a first radio frequency of the second radio frequency band set based on the second scan procedure.

[0022] Some examples of the methods, apparatus, and non-transient computer-readable media described herein may further include operations, features, means, or instructions for determining that the second scan procedure may have been completed based on a time threshold, and removing the indication of the radio frequency band subset of the first radio frequency band set based on the determination that the second scan procedure may have been completed. Attached Figure Description

[0023] Figure 1 Examples of wireless communication systems supporting radio frequency band scanning for a multi-subscriber identification module (SIM) according to various aspects of this disclosure are explained.

[0024] Figure 2 Examples of wireless communication systems supporting radio frequency band scanning for multiple SIMs are described according to various aspects of this disclosure.

[0025] Figure 3 An example flowchart illustrating the support for radio frequency band scanning for multiple SIMs according to various aspects of this disclosure is provided.

[0026] Figure 4 Examples of frequency band scanning techniques supporting radio frequency band scanning for multiple SIMs are explained according to various aspects of this disclosure.

[0027] Figure 5 Examples of frequency band scanning techniques supporting radio frequency band scanning for multiple SIMs are explained according to various aspects of this disclosure.

[0028] Figure 6 An example of a process flow supporting radio frequency band scanning for multiple SIMs according to various aspects of this disclosure is explained.

[0029] Figure 7 and 8 A block diagram of an apparatus supporting radio frequency band scanning for multiple SIMs is shown according to various aspects of this disclosure.

[0030] Figure 9 A block diagram of a communication manager supporting radio frequency band scanning for multiple SIMs, according to various aspects of this disclosure, is shown.

[0031] Figure 10 A diagram of a system including devices supporting radio frequency band scanning for multiple SIMs according to various aspects of this disclosure is shown.

[0032] Figure 11 and 12 A flowchart illustrating a method for supporting radio frequency band scanning for multiple SIMs according to various aspects of this disclosure is shown. Detailed Implementation

[0033] In some wireless communication systems, a User Equipment (UE) can be configured with multiple data subscriptions corresponding to multiple Subscriber Identity Modules (SIMs). In some cases, the multiple data subscriptions can be configured to operate on one or more of the same or overlapping radio frequency bands, and the UE can scan one or more bands as part of multiple scan procedures. For example, the UE can perform a first scan procedure on a first data subscription and a second scan procedure on a second data subscription, and the UE can scan the same one or more bands in both the first and second scan procedures. In some cases, the UE can perform multiple scan procedures after a power-on procedure and / or a radio link failure (RLF). In some cases, the UE can scan the same bands as part of multiple scan procedures, and the UE can scan the same bands in the same order (e.g., the same band sequence) as part of multiple scan procedures. However, scanning the same band sequence as part of multiple scan procedures can be redundant, inefficient, and increase service acquisition time.

[0034] Various aspects of this disclosure provide techniques for performing band scanning procedures in the context of multiple data subscriptions or multiple SIMs. In some cases, the UE can modify a second band scanning procedure based on a first scanning procedure used for a first subscription (e.g., for the same subscription or for a second subscription). For example, the UE can scan the bands of the first subscription as part of the first scanning procedure, and the UE can modify the scanning order of the bands of the second subscription that are scanned as part of the first scanning procedure (e.g., by skipping or reducing priority). The UE can modify the second scanning procedure based on the bands scanned as part of the first scanning procedure (e.g., skipping one or more bands, reducing the priority of one or more bands, prioritizing one or more bands) to avoid redundant band scanning, which can increase battery life and reduce service acquisition time.

[0035] Such techniques may include: at a first subscription, performing a first scan procedure on a first set of radio frequency bands according to a default scan order; storing indications of a subset of radio frequency bands in the first set of radio frequency bands for the first scan procedure; and performing a second scan procedure on a second set of radio frequency bands according to a modified scan order based on the stored indications of the subset of radio frequency bands. The second scan procedure may correspond to a subsequent scan procedure for the first subscription or a scan procedure for the second subscription. These techniques may additionally include: determining the relevance of the stored indications of the subset of radio frequency bands in the first set of radio frequency bands; and determining the modified scan order based on the relevance of the stored indications. In some cases, the relevance may be determined based on the time difference between the first and second scan procedures and / or the location of the first and second scan procedures (e.g., the geographic location, network area location, or cell location of the UE during the first and second scan procedures). For example, a shorter time difference may be associated with a higher relevance, while a longer time difference may be associated with a lower relevance. The modified scan order may be based on skipping one or more frequency bands (e.g., frequency bands scanned as part of the first scan procedure) and / or reducing the priority of one or more frequency bands, so that a unique frequency band is scanned before the frequency bands that have already been scanned.

[0036] The aspects of this disclosure are initially described in the context of wireless communication systems. The aspects of this disclosure are subsequently described in the context of flowcharts, band scanning techniques, and process flows. The aspects of this disclosure are further explained and described by way of apparatus diagrams, system diagrams, and flowcharts relating to radio frequency band scanning for multiple SIMs.

[0037] Figure 1Examples of a wireless communication system 100 supporting radio frequency band scanning for multiple SIMs according to various aspects of this disclosure are described. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an Advanced LTE (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low latency communication, communication with low-cost and low-complexity devices, or any combination thereof.

[0038] Base station 105 can be distributed across a geographical area to form wireless communication system 100, and can be different types of devices or devices with different capabilities. Base station 105 and UE 115 can communicate wirelessly via one or more communication links 125. Each base station 105 can provide a coverage area 110, and UE 115 and base station 105 can establish one or more communication links 125 on the coverage area 110. Coverage area 110 can be an example of a geographical area over which base station 105 and UE 115 can support signal communication according to one or more radio access technologies.

[0039] Each UE 115 can be distributed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 can be stationary or mobile, or stationary and mobile at different times. Each UE 115 can be a different type of device or a device with different capabilities. Figure 1 The document describes some example UE 115s. The UE 115 described herein can communicate with various types of devices, such as other UE 115s, base station 105, or network equipment (e.g., core network nodes, relay equipment, integrated access and backhaul (IAB) nodes, or other network equipment). Figure 1 As shown in the image.

[0040] Each base station 105 may communicate with the core network 130, or with each other, or both. For example, base station 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base stations 105 may communicate with each other directly (e.g., directly between base stations 105), indirectly (e.g., via the core network 130), or directly and indirectly on backhaul links 120 (e.g., via X2, Xn, or other interfaces). In some examples, backhaul link 120 may be or include one or more radio links.

[0041] One or more of the base stations 105 described herein may include, or may be referred to by those skilled in the art as, base transceiver station, radio base station, access point, radio transceiver, B node, evolved B node (eNB), next-generation B node or gigabit B node (any of which may be referred to as gNB), home B node, home evolved B node, or other suitable terms.

[0042] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or any other suitable term, wherein "device" may also be referred to as a unit, station, terminal, or client, etc. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0043] The UE 115 described herein can communicate with various types of devices, such as other UEs 115 that sometimes act as relays, as well as base station 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, relay base stations, etc. Figure 1 As shown in the image.

[0044] UE 115 and base station 105 can wirelessly communicate with each other via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communication link 125. For example, a carrier for communication link 125 may include a portion of the radio spectrum band (e.g., a bandwidth portion (BWP)) operating according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling coordinating carrier operation, user data, or other signaling. Wireless communication system 100 may support communication with UE 115 using carrier aggregation or multi-carrier operation. UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used in conjunction with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0045] In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers. The carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel grid for discovery by UE 115. The carrier may operate in an autonomous mode in which initial acquisition and connection can be performed by UE 115 via that carrier, or in a non-autonomous mode in which the carrier may connect to carriers anchored using different carriers (e.g., different carriers of the same or different radio access technologies).

[0046] The communication link 125 shown in the wireless communication system 100 may include uplink transmission from UE 115 to base station 105, or downlink transmission from base station 105 to UE 115. The carrier may carry downlink or uplink communication (e.g., in FDD mode), or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0047] A carrier may be associated with a specific bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth may be one of several defined bandwidths (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz) of a carrier for a particular radio access technology. Devices of the wireless communication system 100 (e.g., base station 105, UE 115, or both) may have a hardware configuration that supports communication over a specific carrier bandwidth, or may be configurable to support communication over a single carrier bandwidth within a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate over a portion (e.g., a subband, BWP) or all of the carrier bandwidth.

[0048] The signal waveform transmitted on the carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform extended OFDM (DFT-S-OFDM)). In a system employing MCM, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the code rate of the modulation scheme, or both). Thus, the more resource elements the UE 115 receives and the higher the order of the modulation scheme, the higher the data rate the UE 115 can achieve. Wireless communication resources can refer to a combination of radio frequency spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and using multiple spatial layers can further improve the data rate or data integrity of communication with the UE 115.

[0049] One or more parameter designs for a carrier can be supported, where the parameter design may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier can be divided into one or more BWPs with the same or different parameter designs. In some examples, UE 115 can be configured with multiple BWPs. In some examples, a single BWP for a carrier can be active at a given time, and communication for UE 115 can be limited to one or more active BWPs.

[0050] The time interval of base station 105 or UE 115 can be expressed as a multiple of a basic time unit, such as the sampling period T. s =1 / (Δf) max ·Nf) seconds, where Δf max The maximum supported subcarrier spacing can be represented by Nf, while Nf can represent the maximum supported Discrete Fourier Transform (DFT) size. The time interval of the communication resources can be organized according to radio frames, each with a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0051] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may (e.g., in the time domain) be divided into subframes, and each subframe may be further divided into several time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include several symbol periods (e.g., depending on the length of the cyclic prefix added before each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple mini-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., Nf) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0052] A subframe, time slot, mini-slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0053] Physical channels can be multiplexed on a carrier using various techniques. Physical control channels and physical data channels can be multiplexed on a downlink carrier, for example, using one or more of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET)) for physical control channels can be defined by the number of symbol periods and can extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESET) can be configured for a set of UEs 115. For example, one or more UEs 115 can monitor or search control regions for control information based on one or more search space sets, and each search space set can include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for control channel candidates can refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information in a control information format having a given payload size. The search space set may include a common search space set configured to send control information to multiple UEs 115 and a UE-specific search space set configured to send control information to a specific UE 115.

[0054] Each base station 105 may provide communication coverage via one or more cells (e.g., macrocells, small cells, hotspots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used to communicate with base station 105 (e.g., on a carrier) and may be associated with an identifier used to distinguish adjacent cells (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID), or others). In some examples, a cell may also refer to a geographic coverage area 110 or a portion of geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. The extent of such cells may vary from smaller areas (e.g., structures, subsets of structures) to larger areas depending on various factors (such as the capabilities of base station 105). For example, a cell may be or include buildings, subsets of buildings, or external space between or overlapping geographic coverage areas 110, among other examples.

[0055] Macrocells typically cover a relatively large geographic area (e.g., a radius of several kilometers) and allow unrestricted access for UEs 115 that have service subscriptions with a network provider supporting the macrocell. Small cells may be associated with a lower-power base station 105 (compared to macrocells) and may operate in the same or different (e.g., licensed or unlicensed) frequency bands as macrocells. Small cells may provide unrestricted access to UEs 115 that have service subscriptions with a network provider, or may provide restricted access to UEs 115 associated with the small cell (e.g., UEs 115 in a Closed Subscriber Group (CSG), or UEs 115 associated with a user in a home or office). Base station 105 may support one or more cells and may also support communication on one or more cells using one or more component carriers.

[0056] In some examples, a carrier can support multiple cells and can be configured with different cells based on different protocol types that can provide access for different types of devices (e.g., MTC, Narrowband IoT (NB-IoT), Enhanced Mobile Broadband (eMBB)).

[0057] In some examples, base station 105 may be mobile, and thus provide communication coverage to mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. Wireless communication system 100 may include, for example, a heterogeneous network, in which different types of base stations 105 use the same or different radio access technologies to provide coverage to various geographic coverage areas 110.

[0058] The wireless communication system 100 can support synchronous or asynchronous operation. For synchronous operation, base stations 105 can have similar frame timing, and transmissions from different base stations 105 can be approximately time-aligned. For asynchronous operation, base stations 105 can have different frame timing, and transmissions from different base stations 105 may not be time-aligned in some examples. The techniques described herein can be used for both synchronous and asynchronous operation.

[0059] Some UE 115 devices (such as MTC or IoT devices) can be low-cost or low-complexity devices and can provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with base station 105 without human intervention. In some examples, M2M communication or MTC may include communication from devices that have integrated sensors or meters to measure or capture information and relay such information to a central server or application that uses the information or presents it to people interacting with the application. Some UE 115 devices may be designed to collect information or automate the behavior of machines or other devices. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wilderness survival monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial toll collection.

[0060] Some UEs 115 can be configured to operate in reduced-power modes, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication can be performed at a reduced peak rate. Other power-saving techniques for UEs 115 include entering a power-saving deep sleep mode when not engaged in active communication, operating on limited bandwidth (e.g., according to narrowband communication), or a combination of these techniques. For example, some UEs 115 can be configured to operate using a narrowband protocol type associated with a defined portion or range (e.g., subcarriers or resource block (RB) set) within the carrier, within the carrier's guard band, or outside the carrier.

[0061] Wireless communication system 100 may be configured to support ultra-reliable communication or low latency communication, or various combinations thereof. For example, wireless communication system 100 may be configured to support ultra-reliable low latency communication (URLLC) or mission-critical communication. UE 115 may be designed to support ultra-reliable, low latency, or mission-critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private or group communication and may be supported by one or more mission-critical services, such as Mission-Critical Talk-to-Talk (MCPTT), Mission-Critical Video (MCVideo), or Mission-Critical Data (MCData)). Support for mission-critical functions may include prioritization of services, and mission-critical services may be used for public safety or general business applications. The terms ultra-reliable, low latency, mission-critical, and ultra-reliable low latency are used interchangeably herein.

[0062] In some examples, UE 115 may also be able to communicate directly with other UE 115 on a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UE 115s utilizing D2D communication may be within the geographic coverage area 110 of base station 105. Other UE 115s in such a group may be outside the geographic coverage area 110 of base station 105 or may be unable to receive transmissions from base station 105 for other reasons. In some examples, groups of UE 115s communicating via D2D communication may utilize a one-to-many (1:M) system, where each UE 115 transmits to every other UE 115 in the group. In some examples, base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between the individual UE 115s without involving base station 105.

[0063] In some systems, the D2D communication link 135 may be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, vehicles may communicate using vehicle-to-vehicle (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these communications. Vehicles may signal information related to traffic conditions, signaling, weather, safety, emergencies, or any other information relevant to the V2X system. In some examples, vehicles in a V2X system may communicate via vehicle-to-network (V2N) communication through one or more network nodes (e.g., base station 105) with roadside infrastructure (such as roadside units), or with the network, or with both.

[0064] Core network 130 provides user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC) or a 5G core (5GC). The EPC or 5GC may include at least one control plane entity (e.g., a Mobility Management Entity (MME), Access and Mobility Management Function (AMF)) managing access and mobility, and at least one user plane entity (e.g., a Serving Gateway (S-GW), Packet Data Network (PDN) Gateway (P-GW), or User Plane Function (UPF)) routing packets or interconnecting to external networks. The control plane entity manages non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by base station 105 associated with core network 130. User IP packets can be delivered through the user plane entity, which provides IP address allocation and other functions. The user plane entity may be connected to one or more network operator IP services 150. The IP service 150 may include access to the Internet, intranet, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0065] Some network devices (such as base station 105) may include sub-components, such as access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with each UE 115 through one or more other access network transport entities 145, which may be referred to as a radio headend, smart radio headend, or transmit / receive point (TRP). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio headends and ANCs) or combined into a single network device (e.g., base station 105).

[0066] Wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 MHz to 300 GHz. Generally, the 300 MHz to 3 GHz band is referred to as a UHF band or decimeter band because the wavelengths range from approximately 1 decimeter to 1 meter. UHF waves can be blocked or redirected by buildings and environmental features, but these waves can penetrate various structures sufficiently for macrocells to provide service to UE 115 located indoors. Compared to transmissions using smaller frequencies and longer waves in the lower HF or VHF portions of the spectrum below 300 MHz, UHF wave transmission can be associated with smaller antennas and shorter ranges (e.g., less than 100 km).

[0067] The wireless communication system 100 can also operate in the ultra-high frequency (SHF) zoning using a frequency band from 3 GHz to 30 GHz (also known as the centimeter band) or in the extremely high frequency (EHF) zoning using a spectrum (e.g., from 30 GHz to 300 GHz) (also known as the millimeter band). In some examples, the wireless communication system 100 can support millimeter-wave (mmW) communication between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices can be smaller and more closely spaced than UHF antennas. In some examples, this can facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may suffer even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein can be employed across transmissions using one or more different frequency zonings, and the frequency band usage specified across these frequency zonings may vary by country or regulatory authority.

[0068] Wireless communication system 100 may utilize both licensed and unlicensed radio spectrum bands. For example, wireless communication system 100 may employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in unlicensed frequency bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band). When operating in unlicensed radio spectrum bands, devices (such as base station 105 and UE 115) may employ carrier sensing for collision detection and avoidance. In some examples, operation in unlicensed frequency bands may be based on carrier aggregation configuration (e.g., LAA) in coordination with component carriers operating in licensed frequency bands. Operation in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, etc.

[0069] Base station 105 or UE 115 may be equipped with multiple antennas that can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels that can support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may coexist at an antenna assembly (such as an antenna tower). In some examples, the antennas or antenna arrays associated with base station 105 may be located in different geographical locations. Base station 105 may have an antenna array with several rows and columns of antenna ports that base station 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0070] Base station 105 or UE 115 can use MIMO communication to leverage multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. This technique is known as spatial multiplexing. For example, a transmitting device may transmit multiple signals via different antennas or different combinations of antennas. Similarly, a receiving device may receive multiple signals via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO), where multiple spatial layers are transmitted to the same receiving device; and multi-user MIMO (MU-MIMO), where multiple spatial layers are transmitted to multiple devices.

[0071] Beamforming (also known as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting or receiving device (e.g., base station 105, UE 115) to shape or guide an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array, such that some signals propagating relative to a particular orientation of the antenna array experience constructive interference, while others experience destructive interference. Adjustments to the signals transmitted via the antenna elements may include the transmitting or receiving device applying amplitude offset, phase offset, or both to the signals carried via the antenna elements associated with that device. The adjustments associated with each antenna element may be defined by a beamforming weight set associated with a particular orientation (e.g., the antenna array relative to the transmitting or receiving device, or relative to some other orientation).

[0072] Base station 105 or UE 115 may use beamsweeping techniques as part of beamforming operations. For example, base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by base station 105 in different directions. For example, base station 105 may transmit signals according to different beamforming weight sets associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by the transmitting device (such as base station 105) or the receiving device (such as UE 115)) to identify the beam direction that base station 105 will use for later transmission or reception.

[0073] Some signals (such as data signals associated with a specific receiving device) may be transmitted by base station 105 in a single beam direction (e.g., the direction associated with the receiving device (such as UE 115)). In some examples, the beam direction associated with transmission along a single beam direction may be determined based on the signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signals received by UE 115 with the highest signal quality or other acceptable signal quality.

[0074] In some examples, transmissions performed by a device (e.g., by base station 105 or UE 115) may be executed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate combined beams for transmission (e.g., from base station 105 to UE 115). UE 115 may report feedback indicating precoding weights for one or more beam directions, and this feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. Base station 105 may transmit reference signals that may be precoded or unprecoded (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)). UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel type codebook, linear combination type codebook, port selection type codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may use similar techniques to transmit signals multiple times in different directions (e.g., to identify the beam direction used by UE 115 for subsequent transmission or reception) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0075] A receiver device (e.g., UE 115) may attempt multiple receive configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105. For example, the receiver device may attempt multiple receive directions by: receiving via different antenna subarrays; processing received signals according to different antenna subarrays; receiving according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of the antenna array (e.g., different directional listening weight sets); or processing received signals according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of the antenna array, any of which may be referred to as “listening” according to different receive configurations or receive directions. In some examples, the receiver device may use a single receive configuration to receive along a single beam direction (e.g., when a data signal is received). The single receive configuration may be aligned on a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0076] Wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer can be IP-based. The Radio Link Control (RLC) layer performs packet segmentation and reassembly for communication on logical channels. The Media Access Control (MAC) layer performs priority handling and multiplexing of logical channels into transport channels. The MAC layer can also use error detection, error correction, or both to support MAC layer retransmissions to improve link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer can provide the establishment, configuration, and maintenance of RRC connections between UE 115 and base station 105 or core network 130 supporting user plane data radio bearers. At the physical layer, transport channels can be mapped to physical channels.

[0077] UE 115 and base station 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique used to increase the likelihood of correctly receiving data on communication link 125. HARQ may include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), forward error correction (FEC), and retransmission (e.g., Automatic Repeat Request (ARQ)). HARQ can improve MAC layer throughput in poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, the device may support simultaneous time-slot HARQ feedback, where the device can provide HARQ feedback in a specific time slot for data received in previous symbols within that time slot. In other cases, the device may provide HARQ feedback in subsequent time slots or according to some other time interval.

[0078] At its first subscription point, UE 115 can perform a first scan procedure on a first set of radio frequency bands according to a default scan order, store indications of a subset of radio frequency bands in the first set of radio frequency bands for the first scan procedure, and perform a second scan procedure on a second set of radio frequency bands according to a modified scan order based on the stored indications of that subset of radio frequency bands. In some cases, UE 115 can determine the relevance of the stored indications of the subset of radio frequency bands in the first set of radio frequency bands and determine the modified scan order based on the relevance of the stored indications.

[0079] Figure 2 Examples of a wireless communication system 200 supporting radio frequency band scanning for multiple SIMs according to various aspects of this disclosure are described. In some examples, the wireless communication system 200 may implement various aspects of the wireless communication system 100. The wireless communication system 200 may include a base station 105-a and a UE 115-a, which may be respectively as referred to Figure 1 Examples of base station 105 and UE 115 described herein. Base station 105-a may be associated with coverage area 110-a and coverage area 110-b, and UE 115-a may be configured to communicate with base station 105-a. In some examples, UE 115-a may be configured to have multiple subscriptions (e.g., multiple SIMs, dual SIMs, multi-SIM, etc.) and communicate with one or more base stations 105 via multiple cells.

[0080] In some scenarios, UE 115-a may be configured with multiple subscriptions (e.g., multiple SIMs) and perform a band scanning procedure for each of these subscriptions. For example, UE 115-a may be associated with subscription 210-a (e.g., a first subscription, a first SIM) and subscription 210-b (e.g., a second subscription, a second SIM). UE 115-a may execute subscription scanning procedure 205, which can reduce power consumption, increase battery life, and improve user experience. For example, subscription scanning procedure 205 can reduce the number of bands scanned by UE 115-a and improve the efficiency of one or more band scanning procedures.

[0081] As part of subscription scanning procedure 205, UE 115-a may store indications of frequency bands scanned during a first frequency band scanning procedure corresponding to a first subscription (e.g., subscription 210-a), and use these indications to skip, downgrade, or otherwise reorder frequency bands used for a second frequency band scanning procedure corresponding to subscription 210-a or a second subscription (e.g., subscription 210-b). In some cases, subscription 210-a and subscription 210-b may correspond to the same subscription (e.g., the same SIM), while in other cases, subscription 210-a and subscription 210-b may correspond to different subscriptions (e.g., different SIMs).

[0082] In some scenarios, as part of subscription scan procedure 205, UE 115-a may determine the relevance of the scan procedure or one or more frequency bands of the scan procedure, and use the determined relevance to skip, reduce priority, or otherwise reorder frequency bands used for additional frequency band scan procedures. For example, if the stored information corresponding to a frequency band is determined to be relevant (e.g., having a relevance metric above a threshold because the frequency band was recently scanned and / or the UE is in the same location), UE 115-a may skip a frequency band scanned during the first frequency band scan procedure during the second frequency band scan procedure. As another example, if the stored information corresponding to a frequency band is determined to be less relevant (e.g., having a relevance metric below a threshold because a threshold time has elapsed since the first frequency band scan procedure and / or the UE has moved since the first frequency band scan procedure), UE 115-a may reduce the priority of a frequency band scanned during the first frequency band scan procedure during the second frequency band scan procedure. UE 115-a can use one or more procedures or methodologies to determine band relevance covering a variety of conditions and metrics. The determined relevance can support flexible and robust band scanning techniques to improve battery life and user experience.

[0083] In some scenarios, UE 115-a can determine the relevance of stored band information from a first band scan procedure based on one or more timers. For example, one or more timers can be used to determine how much time has elapsed since the first band scan procedure. In some examples, less elapsed time may correspond to higher relevance, and more elapsed time may correspond to lower relevance. Timers can be configured statically or dynamically (e.g., time duration configuration, time threshold configuration, etc.). As a non-limiting example, UE 115-a can start a timer and store indications of bands scanned as part of a first band scan procedure for subscription 210-a, and skip or reduce the priority of one or more bands as part of a second band scan procedure for subscription 210-b based on the stored indications of bands and the timer indicating the amount of elapsed time. The timer can be started based on the completion of the band scan procedure, the expiration of the second timer, or the amount of time elapsed since the second timer was started. In some examples, UE 115-a may skip one or more frequency bands that are part of the second band scanning procedure for subscription 210-b (or subscription 210-a) based on a timer threshold not being met (e.g., less than a threshold amount of time has elapsed). In some additional or alternative examples, UE 115-a may reduce (e.g., move to the end of the queue) the priority of one or more frequency bands that are part of the second band scanning procedure for subscription 210-b (or subscription 210-a) based on a timer threshold being met (e.g., at least a threshold amount of time has elapsed, at least a first threshold amount of time and less than a second threshold amount of time have elapsed). In some cases, UE 115-a may store a timestamp along with each indication of one or more scanned frequency bands that are part of the first band scanning procedure, and UE 115-a may determine how much time has elapsed since the indication of the frequency band was stored.

[0084] In some additional or alternative scenarios, UE 115-a may determine the relevance of stored frequency band information based on location and / or mobility. For example, UE 115-a may determine geographic location based on Global Positioning System (GPS) coordinates and / or Public Land Mobile Network (PLMN). In some examples, UE 115-a may determine mobility status based on the Tracking Area Code (TAC) and / or the number of cell changes. UE 115-a may scan a frequency band at a first location as part of a first frequency band scanning procedure, and UE 115-a may scan the same frequency band at a second location as part of a second frequency band scanning procedure. In some cases, UE 115-a may determine higher relevance of information stored from the first scanning procedure based on the first location being the same as or close to the second procedure scanning location. UE 115-a may determine lower relevance of information stored from the first scanning procedure based on the first location being different from or significantly different from the second procedure scanning location. Additionally, the time threshold or duration can be configured based on device mobility, which can further improve the accuracy of the determined correlations. For example, highly mobile UEs can be configured with shorter time thresholds or durations, while more stationary or static UEs can be configured with longer time thresholds or durations. Configuring relatively mobile UEs with shorter time thresholds and relatively stationary UEs with longer time thresholds before scanning frequency bands that are unlikely to be associated with a frequency or PLMN can support UEs in scanning frequency bands that may be associated with a frequency or PLMN, which can reduce redundant frequency band scanning and increase the speed at which UEs occupy the cell.

[0085] In some scenarios, UE 115-a can determine band relevance based on one or more techniques as described herein. For example, combining multiple techniques (e.g., timer-based and location-based techniques) to determine band relevance (e.g., saved band scan results) can enable UE 115-a to skip previously scanned bands or reduce their priority, which can reduce signal acquisition time and improve user experience.

[0086] Figure 3 An example of a flowchart 300 supporting radio frequency band scanning for multiple SIMs according to various aspects of this disclosure is explained. In some examples, flowchart 300 may implement various aspects of wireless communication system 100 or 200. A UE may be associated with multiple network subscriptions. For example, a UE may be associated with a first subscription (e.g., SUB1) corresponding to a first SIM (e.g., SIM1) and a second subscription (e.g., SUB2) corresponding to a second SIM (e.g., SIM2). In some cases, subscriptions may correspond to a default data SIM (DDS), a non-DDS (nDDS), etc.

[0087] In 305, the first subscription can be opted out of service (OOS). For example, the UE can leave the coverage area of ​​the cell corresponding to the first subscription (e.g., SUB1), which can cause the first subscription (e.g., SUB1) to become OOS.

[0088] At 310, the UE can complete the Acquisition Database (ACQ-DB) procedure and the first frequency band scanning procedure corresponding to the first subscription (e.g., SUB1). In some cases, the UE can perform the first frequency band scanning procedure based on frequencies not identified as part of the ACQ-DB procedure (e.g., PLMN, Synchronization Signal Block (SSB), cell, etc.). The UE can store indications of frequency bands that are part of the first frequency band scanning procedure.

[0089] In 315, a second subscription (e.g., SUB2) may become out of service (OOS). For example, a UE may leave the coverage area of ​​the cell corresponding to the second subscription (e.g., SUB2), which may cause the second subscription (e.g., SUB2) to become OOS.

[0090] At 320, the UE may execute a second frequency band scanning procedure. In some cases, the second frequency band scanning procedure may be based on the first frequency band scanning procedure. For example, the UE may identify one or more scanned frequency bands for the second scanning procedure based on stored results from the first frequency band scanning procedure. The UE may determine the relevance of the stored information from the first frequency band scanning procedure and, based on the determined relevance, skip or reduce the priority of one or more frequency bands in the second frequency band scanning procedure. For example, if the stored information about those frequency bands has a relevance higher than a threshold, the UE may suppress scanning (e.g., skip) the frequency bands scanned as part of the first frequency band scanning procedure. If the relevance of the stored information about those frequency bands is lower than a threshold, the UE may reduce the priority of the frequency bands scanned as part of the first frequency band scanning procedure (e.g., modify the scanning order so that a unique frequency band is scanned before previously scanned frequency bands). In some examples, the second frequency band scanning procedure may be executed by SUB1, where SUB1 uses the stored information from the first frequency band scanning procedure to determine the scanning order for the second frequency band scanning procedure.

[0091] At 325, the UE can complete a second frequency band scan procedure. In some cases, the time required to complete the second frequency band scan procedure may be less than the time required to complete the first frequency band scan procedure because the UE can utilize the frequency band scanning information from the first frequency band scan procedure (e.g., frequency bands associated with a frequency and / or SSB, frequency bands not associated with a frequency and / or SSB, etc.). Utilizing frequency band scanning information from one scan procedure in another scan procedure can improve network connection speed. For example, after the power-on procedure, the UE can use the techniques described herein to quickly obtain services for nDDS.

[0092] Figure 4 Examples of a band scanning technique 400 supporting radio frequency band scanning for multiple SIMs, according to various aspects of this disclosure, are described. In some examples, the band scanning technique 400 can implement various aspects of wireless communication systems 100 or 200. The UE can utilize one or more techniques described in the band scanning technique 400 to quickly identify frequencies or SSBs and camp on a cell.

[0093] In some scenarios, the UE may execute a first frequency band scanning procedure for a first subscription (e.g., SUB 410-a, first SIM) and a second frequency band scanning procedure for a second subscription (e.g., SUB 410-b, SUB 410-c, second SIM). In some scenarios, the UE may be configured with one or more time thresholds (e.g., time threshold 425-a, time threshold 425-b, time threshold 425-c). The UE may use the frequency band scanning information from the first frequency band scanning procedure to reduce the signal acquisition time of the second frequency band scanning procedure.

[0094] As a non-limiting example, the UE may execute a first band scanning procedure for a first subscription (e.g., SUB 405-a). The UE may not use ACK-DB 410-a to identify the valid frequencies or SSBs for the first subscription as part of the band scanning. The UE may execute scanning procedure 415-a for bands one through twelve of the first subscription. In 425-a, the UE may complete scanning procedure 415-a and start a timer. The UE may store an indication of the bands scanned as part of scanning procedure 415-a. The UE may execute a second band scanning procedure for a second subscription (e.g., SUB 405-b, second SIM). The UE may not use ACK-DB 410-b to identify the valid frequencies or SSBs for the second subscription as part of the band scanning, and the UE may execute scanning procedure 415-b for bands three through fifteen of the second subscription (e.g., SUB 405-b). In some cases, the UE may determine the relevance of the frequency band scanning information from scan procedure 415-a (e.g., first frequency band scan procedure) to scan procedure 415-b or to scan procedure 415-c (e.g., second frequency band scan procedure) based on one or more time indicators 425 (e.g., time threshold 425).

[0095] In some cases, the second frequency band scanning procedure may begin during time duration 420-a (e.g., after 425-a, before 425-b, after 425-a, and before 425-b, etc.), and the UE may skip the frequency band shared by the first subscription (e.g., 405-a) and the second subscription (SUB 405-b). For example, the UE may skip frequency bands three to twelve in the second frequency band scanning procedure (e.g., scanning procedure 415-b) based on scanning frequency bands three to twelve as part of the first scanning procedure (e.g., scanning procedure 415-a) (e.g., suppressing scanning). The UE may camp on cell twelve based on the second frequency band scanning procedure (e.g., scanning procedure 415-b).

[0096] In some additional or alternative scenarios, the second frequency band scanning procedure (e.g., scan procedure 415-c) may begin during time duration 420-b (e.g., before, after, and before 425-c), and the UE may de-prioritize the frequency band shared by the first subscription (e.g., SUB 405-a) and the second subscription (e.g., SUB 405-b). For example, the UE may scan the frequency band unique to the second SIM (e.g., SUB 405-b or SUB 405-c) before scanning the frequency band shared by the first SIM (e.g., SUB 405-a) and the second SIM. In some scenarios, the UE may restart the timer or start a new timer at time indicator 425-b (e.g., time threshold 425-b). The UE may camp on Cell Twelve based on the second frequency band scanning procedure (e.g., scan procedure 415-c). In 425-c, the UE may mark the timer expiration and delete the context of the scanned frequency band. For example, the UE can delete (e.g., remove) the stored indication of the scanned frequency band.

[0097] The UE can store indications (e.g., indications of Global Synchronization Channel Numbers (GSCNs)) of frequencies detected for a first subscription (e.g., SUB 405-a) in the ACK-DB, and when performing a band scanning procedure for a second subscription (e.g., SUB 405-b, SUB 405-c, etc.), the UE can scan the frequencies indicated in the ACK-DB. Scanning the frequencies indicated in the ACK-DB allows the UE to scan all detected frequencies overlapping with the first and second subscriptions before performing a band scanning procedure for a subscription (e.g., scan procedure 415-b, scan procedure 415-c), which prevents the UE from losing valid cells while performing the band scanning procedure.

[0098] Figure 5 Examples of a band scanning technique 500 supporting radio frequency band scanning for multiple SIMs, according to various aspects of this disclosure, are described. In some examples, the band scanning technique 500 can implement various aspects of wireless communication systems 100 or 200. A UE can utilize one or more techniques described in the band scanning technique 500 as part of a band scanning procedure, which can support the UE in rapidly camping on one or more cells.

[0099] In some scenarios, the UE may execute band scanning procedures for a first subscription (e.g., SUB 505-a) and a second subscription (e.g., SUB505-b). The UE may use band scanning information from the first band scanning procedure to reduce signal acquisition time for the second band scanning procedure. For example, the UE may determine the relevance or applicability of band scanning information from the first band scanning procedure to the second band scanning procedure. The UE may determine the relevance or applicability of the band scanning information based on time differences, device mobility levels, the operator corresponding to the first subscription or SIM, the operator corresponding to the second subscription or SIM, or any combination thereof.

[0100] As a non-limiting example, the UE may execute a first frequency band scanning procedure (e.g., scanning procedure 515-a) for a first subscription (e.g., SUB 505-a, first SIM). The UE may not use ACK-DB 510-a to identify valid cells for the first subscription as part of the frequency band scan, and the UE may not use ACK-DB 510-b to identify valid cells for a second subscription (e.g., SUB 505-b, second SIM) as part of the frequency band scan. At 520, the UE may complete a scan of eight frequency bands (e.g., bands 1 to 8) as part of scanning procedure 515-a, and the UE may begin scanning procedure 515-b. In some cases, the UE may store indications of the frequency bands scanned as part of scanning procedure 515-a (e.g., indications of bands 1 to 8). The UE may utilize information about the frequency bands scanned as part of scanning procedure 515-a to improve the speed of scanning procedure 515-b. For example, the UE can scan the last two frequency bands (e.g., bands 9 and 10) of the second subscription (e.g., SUB 505-b). In some cases, the UE can complete scan procedures 515-a and 515-b simultaneously or nearly simultaneously. For example, the UE can camp on the first cell corresponding to the first subscription and the second cell corresponding to the second subscription based on scan procedures 515-a and 515-b, respectively. It should be understood that during the frequency band scan corresponding to ACK-DB 510-b, the UE can scan all detected frequencies (e.g., detected cells, detected GSCNs) that are part of the overlapping frequency bands of the first subscription (e.g., SUB 505-a) and the second subscription (e.g., SUB 505-b), so the UE can skip one or more overlapping frequency bands without skipping non-overlapping frequency bands.

[0101] In some scenarios, the UE can implement one or more of the strategies described herein after powering on in a new area. For example, the UE can power on in NR+NR mode (e.g., dual-SIM mode, multi-SIM mode). A DDS subscription (e.g., SUB 505-a) may be online first, and no ACK-DB entry can be detected (e.g., radiation), so the UE can perform a band scanning procedure (e.g., scan procedure 515-a). An nDDS subscription (e.g., SUB 505-b) may be online a few seconds after the DDS subscription, and no ACK-DB entry can be detected (e.g., radiation), so the UE can perform an additional band scanning procedure (e.g., scan procedure 515-b). The UE can skip one or more bands when performing an additional band scanning procedure (e.g., scan procedure 515-b) based on the band scanning information from the band scanning procedure (e.g., scan procedure 515-a). In some examples, if scan procedure 515-a is in progress, an nDDS subscription (e.g., SUB 505-b) can query a DDS subscription (e.g., SUB 515-a) to determine band scan information (e.g., the bands that the DDS subscription (e.g., SUB 505-a) has scanned). In some other examples, if scan procedure 515-a is not in progress, a timer may be running, and an nDDS subscription (e.g., SUB 505-b) can use an indication of the scanned bands to determine band scan information (e.g., the bands that the DDS subscription (e.g., SUB 505-a) has scanned).

[0102] In some scenarios, the UE can implement one or more of the strategies described herein after an RLF (Restricted Frequency Failure). In some examples, if any subscription has already performed a band scan as part of a PLMN search or OOS (Out of Service) scan, the UE can start a timer. If the subscription experiences an RLF or OOS state and no valid cells are found in the ACK-DB, the UE can execute the band scan procedure for the subscription. In some scenarios, if a timer is running, the UE can skip a band shared by one subscription and another while performing a band scan for that subscription. In some additional or alternative scenarios, if a different timer is running, or if a threshold time condition has been met (e.g., at least a certain amount of time has elapsed since the timer started), the UE can lower the priority of a band shared by one subscription and another. There may be a higher chance of finding frequencies on a unique band rather than a shared band, so prioritizing unique bands (e.g., lowering the priority of shared bands) can reduce occupancy latency and improve user experience.

[0103] In some scenarios, the techniques described herein can generate significant power savings during power-on scanning in areas with no or sparse cellular coverage. With the advent of autonomous NR operation, each specification may have a large number of supported frequency bands, and scanning all supported bands in areas without cellular coverage can be time-consuming; however, the techniques described herein can reduce scan time. In some additional or alternative scenarios, the UE can implement the techniques described herein on Individual Absolute Radio Channel Numbers (ARFCNs) and / or Subcarrier Spacing (SCSs) as alternatives to or supplements to the full frequency band. Implementing these techniques on ARFCNs and / or SCSs can reduce power usage and signal acquisition time in the context of partial scanning.

[0104] Figure 6 Examples of a process flow 600 supporting radio frequency band scanning for multiple SIMs according to various aspects of this disclosure are described. In some examples, process flow 600 may implement various aspects of wireless communication system 100 or 200. Process flow 600 includes UE 115-b and base station 105-b, which may be referenced Figures 1 to 5 Examples of the corresponding devices described. UE 115-b can split uplink data across links to improve battery life and reduce signal acquisition time. The following alternative examples can be implemented, some of which may be performed in a different order than described or not at all. In some cases, the steps may include additional features not mentioned below, or further steps may be added.

[0105] At 605, UE 115-b may perform a first band scan procedure on a first set of radio frequency bands according to a default scan order at the first subscription. In some cases, the first subscription may correspond to nDDS.

[0106] At 610, the UE may store an indication of a subset of radio frequency bands for a first set of radio frequency bands used in a first scanning procedure. In some cases, the subset of radio frequency bands may correspond to radio frequency bands that have been scanned as part of the first band scanning procedure. In some additional or alternative cases, the subset of radio frequency bands may correspond to radio frequency bands that have been scanned but have not been identified as valid radio frequency bands (e.g., radio frequency bands available for occupancy).

[0107] In some cases, the UE may determine the relevance of the stored indications for a subset of radio frequency bands at 615. In some examples, the UE may determine the relevance of the stored indications for a subset of radio frequency bands based on the time difference between the first scan procedure and the second scan procedure and / or the position of the first scan procedure and the position of the second scan procedure. In some cases, the UE may determine a modified scan order based on the relevance of the stored indications. For example, the UE may determine whether to skip scans of some bands that are part of the second scan procedure, reduce the priority of scans of some bands that are part of the second scan procedure, or otherwise modify the scan order based on the relevance of the information stored from the first scan procedure.

[0108] In 620, UE 115-b can perform a second band scanning procedure on a second set of radio frequency bands according to a modified scan order based on stored indications of a subset of radio frequency resources. In some cases, the modified scan order may be based on skipping one or more radio frequency bands in the second set of radio frequency bands, reducing the priority of one or more radio frequency bands in the second set of radio frequency bands, or prioritizing one or more radio frequency bands in the second set of radio frequency bands.

[0109] In 625, UE 115-b can establish a connection with base station 105-b based on a first scanning procedure, a second scanning procedure, or both (e.g., camping on a cell).

[0110] Figure 7 A block diagram 700 of a device 705 supporting radio frequency band scanning for multiple SIMs according to aspects of this disclosure is shown. Device 705 may be an example of aspects of UE 115 as described herein. Device 705 may include a receiver 710, a communication manager 715, and a transmitter 720. Device 705 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0111] Receiver 710 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to radio frequency band scanning for multiple SIMs). This information can be transmitted to other components of device 705. Receiver 710 can be a reference... Figure 10 Examples of various aspects of the transceiver 1020 described. The receiver 710 may utilize a single antenna or an array of antennas.

[0112] The communication manager 715 can, at a first subscription point of the UE, perform a first scan procedure on a first set of radio frequency bands according to a default scan order, store indications of a subset of radio frequency bands in the first set of radio frequency bands for the first scan procedure, and perform a second scan procedure on a second set of radio frequency bands according to a modified scan order based on the stored indications of the subset of radio frequency bands. The communication manager 715 may be an example of various aspects of the communication manager 1010 described herein.

[0113] The communication manager 715 or its sub-components may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functionality of the communication manager 715 or its sub-components may be performed by a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described in this disclosure.

[0114] The communication manager 715 or its subcomponents may be physically located at various locations, including being distributed such that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of this disclosure, the communication manager 715 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of this disclosure, the communication manager 715 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in this disclosure, or combinations thereof.

[0115] Transmitter 720 can transmit signals generated by other components of device 705. In some examples, transmitter 720 may coexist with receiver 710 in a transceiver module. For example, transmitter 720 may be a reference... Figure 10 Examples of various aspects of the transceiver 1020 described. The transmitter 720 may utilize a single antenna or an array of antennas.

[0116] The actions performed by the communication manager 715, etc., described herein can be implemented to achieve one or more potential advantages. For example, the communication manager 715 can increase available battery power, improve band scanning efficiency, and reduce service acquisition time at the radio device (e.g., UE 115) by supporting band scanning procedures for multiple SIMs. For example, as described herein, a modified scanning order of the radio frequency resource set can improve band scanning efficiency by providing techniques for scanning bands that may be associated with value frequencies or SSBs. Improved scanning efficiency can lead to faster service acquisition and less power usage. Accordingly, the communication manager 715 can save power and increase battery life at the radio device (e.g., UE 115) by improving the efficiency of band scanning.

[0117] Figure 8 A block diagram 800 of a device 805 supporting radio frequency band scanning for multiple SIMs according to aspects of this disclosure is shown. Device 805 may be an example of aspects of device 705 or UE 115 as described herein. Device 805 may include a receiver 810, a communication manager 815, and a transmitter 830. Device 805 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0118] Receiver 810 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to radio frequency band scanning for multiple SIMs). This information can be transmitted to other components of device 805. Receiver 810 can be a reference... Figure 10 Examples of various aspects of the transceiver 1020 described. The receiver 810 may utilize a single antenna or an array of antennas.

[0119] Communication manager 815 may be an example of aspects of communication manager 715 as described herein. Communication manager 815 may include band scan manager 820 and band indication manager 825. Communication manager 815 may be an example of aspects of communication manager 1010 as described herein.

[0120] The band scan manager 820 can perform a first scan procedure on a first set of radio frequency bands according to a default scan order at the first subscription point of the UE. The band indication manager 825 can store indications for a subset of radio frequency bands in the first set of radio frequency bands used for the first scan procedure. The band scan manager 820 can perform a second scan procedure on a second set of radio frequency bands according to a modified scan order based on the stored indications for the subset of radio frequency bands.

[0121] Transmitter 830 can transmit signals generated by other components of device 805. In some examples, transmitter 830 may coexist with receiver 810 in a transceiver module. For example, transmitter 830 may be a reference... Figure 10 Examples of various aspects of the transceiver 1020 described. The transmitter 830 may utilize a single antenna or an array of antennas.

[0122] Figure 9 A block diagram 900 is shown of a communication manager 905 supporting radio frequency band scanning for multiple SIMs according to various aspects of this disclosure. The communication manager 905 may be an example of aspects of the communication manager 715, communication manager 815, or communication manager 1010 described herein. The communication manager 905 may include a band scanning manager 910, a band indication manager 915, a band correlation manager 920, a timer manager 925, and a resident manager 930. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0123] The band scan manager 910 can perform a first scan procedure on a first set of radio frequency bands according to a default scan order at the first subscription point of the UE. The band indication manager 915 can store indications for a subset of radio frequency bands in the first set of radio frequency bands used for the first scan procedure. In some examples, the band scan manager 910 can perform a second scan procedure on a second set of radio frequency bands according to a modified scan order based on the stored indications for the subset of radio frequency bands.

[0124] In some examples, the band scan manager 910 may determine that the second scan procedure begins within a first time threshold from the end of the first scan procedure. In some examples, the band scan manager 910 may skip a subset of the first radio frequency band set based on an indication of a subset of radio frequency bands.

[0125] In some examples, the band scan manager 910 may determine that the second scan procedure begins within a second time threshold from the end of the first scan procedure. In some examples, the band scan manager 910 may determine a modified scan order based on the indication of the radio frequency band subset by prioritizing scans of radio frequency bands in the second radio frequency band set that are different from the radio frequency band subset of the first radio frequency band set.

[0126] In some examples, the band scan manager 910 may determine that the second scan procedure has been completed based on a time threshold being met. In some examples, the band scan manager 910 may remove the indication of the radio frequency band subset of the first radio frequency band set based on the determination that the second scan procedure has been completed.

[0127] In some cases, a subset of the first set of radio frequency bands corresponds to the radio frequency bands scanned during the first scan procedure.

[0128] The band correlation manager 920 can determine the correlation of stored indications for a subset of radio frequency bands in the first radio frequency band set. In some examples, the band correlation manager 920 can determine a modified scan order based on the correlation of the stored indications.

[0129] In some examples, the band correlation manager 920 can identify the time difference between the first scan procedure and the second scan procedure, the position of the first scan procedure and the position of the second scan procedure, or a combination thereof.

[0130] The timer manager 925 can configure a first timer length for a first timer and a second timer length for a second timer, wherein the first timer length is shorter than the second timer length. In some examples, the timer manager 925 can determine that the first timer is active. In some examples, the timer manager 925 can determine that the second timer is active. In some examples, the timer manager 925 can activate the first timer and execute the second scan procedure based on the activation of the first timer.

[0131] The occupancy manager 930 can occupy a first radio frequency of the first radio frequency band set based on the first scan procedure. In some examples, the occupancy manager 930 can occupy a first radio frequency of the second radio frequency band set based on the second scan procedure.

[0132] Figure 10 A diagram of a system 1000 including a device 1005 supporting radio frequency band scanning for multiple SIMs according to various aspects of this disclosure is shown. Device 1005 may be an example of device 705, device 805, or UE 115 as described herein, or a component including the aforementioned devices. Device 1005 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 1010, an I / O controller 1015, a transceiver 1020, an antenna 1025, a memory 1030, and a processor 1040. These components may be in electronic communication via one or more buses (e.g., bus 1045).

[0133] The communication manager 1010 can, at the first subscription point of the UE, perform a first scan procedure on a first set of radio frequency bands according to a default scan order, store an indication of a subset of radio frequency bands of the first set of radio frequency bands for the first scan procedure, and perform a second scan procedure on a second set of radio frequency bands according to a modified scan order based on the stored indication of the subset of radio frequency bands.

[0134] By including or configuring a communication manager 1010 according to an example as described herein, device 1005 can support technologies for improving latency battery life, bandwidth scanning efficiency, service acquisition time, power consumption, coordination and processing capabilities between devices, and other benefits.

[0135] I / O controller 1015 manages the input and output signals of device 1005. I / O controller 1015 can also manage peripheral devices not integrated into device 1005. In some cases, I / O controller 1015 may represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1015 may utilize an operating system, such as... Or another known operating system. In other cases, the I / O controller 1015 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, the I / O controller 1015 may be implemented as part of a processor. In some cases, a user may interact with the device 1005 via the I / O controller 1015 or via hardware components controlled by the I / O controller 1015.

[0136] Transceiver 1020 can communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, transceiver 1020 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 1020 may also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and to demodulate packets received from the antenna.

[0137] In some cases, the wireless device may include a single antenna 1025. However, in other cases, the device may have more than one antenna 1025, which may be able to transmit or receive multiple wireless transmissions concurrently.

[0138] Memory 1030 may include random access memory (RAM) and read-only memory (ROM). Memory 1030 may store computer-readable, computer-executable code 1035, including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, memory 1030 may particularly include a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0139] Processor 1040 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, central processing units (CPUs), microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1040 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 1040. Processor 1040 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1030) to cause device 1005 to perform various functions (e.g., supporting various functions or tasks for radio frequency band scanning for multiple SIMs).

[0140] Code 1035 may include instructions for implementing various aspects of this disclosure, including instructions for supporting wireless communication. Code 1035 may be stored in a non-transient computer-readable medium, such as system memory or other types of memory. In some cases, code 1035 may not be directly executed by processor 1040, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0141] Figure 11 A flowchart illustrating a method 1100 for supporting radio frequency band scanning for multiple SIMs according to various aspects of this disclosure is shown. Operation of method 1100 may be implemented by a UE 115 or its components as described herein. For example, operation of method 1100 may be implemented by, as described in reference... Figures 7 to 10 The described communication manager is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0142] At 1105, the UE may, at its first subscription location, perform a first scan procedure on a first set of radio frequency bands according to a default scan order. The operation of 1105 may be performed according to the methods described herein. In some examples, aspects of the operation of 1105 may be derived from, as referenced... Figures 7 to 10 The described frequency band scan manager is used to perform this.

[0143] At 1110, the UE may store an indication of a subset of radio frequency bands of the first radio frequency band set used for the first scan procedure. Operation of 1110 may be performed according to the methods described herein. In some examples, aspects of the operation of 1110 may be determined by reference to... Figures 7 to 10 The described frequency band indicator manager is used to perform this.

[0144] At 1115, the UE can perform a second scan procedure on the second radio frequency band set according to a modified scan order based on the stored indication of the radio frequency band subset. The operation of 1115 can be performed according to the methods described herein. In some examples, aspects of the operation of 1115 can be determined by referring to... Figures 7 to 10 The described frequency band scan manager is used to perform this.

[0145] Figure 12 A flowchart illustrating a method 1200 for supporting radio frequency band scanning for multiple SIMs according to various aspects of this disclosure is shown. Operation of method 1200 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1200 can be implemented by, as described in reference... Figures 7 to 10 The described communication manager is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0146] At 1205, the UE may, at its first subscription point, perform a first scan procedure on a first set of radio frequency bands according to a default scan order. The operation of 1205 may be performed according to the methods described herein. In some examples, aspects of the operation of 1205 may be derived from, as referenced... Figures 7 to 10 The described frequency band scan manager is used to perform this.

[0147] In 1210, the UE may store an indication of a subset of radio frequency bands of the first radio frequency band set used for the first scan procedure. Operation of 1210 may be performed according to the methods described herein. In some examples, aspects of the operation of 1210 may be determined by reference to... Figures 7 to 10 The described frequency band indicator manager is used to perform this.

[0148] At 1215, the UE can determine the relevance of the stored indication of that subset of radio frequency bands in the first set of radio frequency bands. The operation of 1215 can be performed according to the methods described herein. In some examples, aspects of the operation of 1215 can be determined by reference to... Figures 7 to 10 The described band correlation manager is used to perform this.

[0149] In 1220, the UE can determine the modified scan order based on the relevance of the stored indications. The operation of 1220 can be performed according to the methods described herein. In some examples, aspects of the operation of 1220 can be determined by reference to... Figures 7 to 10 The described band correlation manager is used to perform this.

[0150] At 1225, the UE can perform a second scan procedure on the second radio frequency band set according to the modified scan order based on the stored indication of the radio frequency band subset. The operation of 1225 can be performed according to the method described herein. In some examples, aspects of the operation of 1225 can be determined by referring to... Figures 7 to 10 The described frequency band scan manager is used to perform this.

[0151] The following provides an overview of the various aspects of this disclosure:

[0152] Aspect 1: A method for wireless communication at a UE, comprising: performing a first scan procedure on a first set of radio frequency bands according to a default scan order at a first subscription of the UE; storing an indication of a subset of radio frequency bands of the first set of radio frequency bands for the first scan procedure; and performing a second scan procedure on a second set of radio frequency bands according to a modified scan order based at least in part on the stored indication of the subset of radio frequency bands.

[0153] Aspect 2: The method of Aspect 1, wherein performing the second scan procedure includes: determining the correlation of a stored indication of the radio frequency band subset of the first radio frequency band set; and determining the modified scan order based at least in part on the correlation of the stored indication.

[0154] Aspect 3: The method of aspect 2, wherein determining the correlation of the stored indication of the radio frequency band subset of the first radio frequency band set includes: identifying the time difference between the first scan procedure and the second scan procedure, the position of the first scan procedure and the position of the second scan procedure, or a combination thereof.

[0155] Aspect 4: The method of any of Aspects 1 to 3, wherein performing the second scan procedure includes: determining that the second scan procedure begins within a first time threshold from the end of the first scan procedure; and skipping the radio frequency band subset of the first radio frequency band set based at least in part on the instruction of the radio frequency band subset.

[0156] Aspect 5: The method of any of Aspects 1 to 4, wherein performing the second scan procedure includes: determining that the second scan procedure begins within a second time threshold from the end of the first scan procedure; and determining the modified scan order by prioritizing scans of radio frequency bands in the second set of radio frequency bands that are different from the radio frequency band subset of the first set of radio frequency bands, based at least in part on the indication of the radio frequency band subset.

[0157] Aspect 6: The method of aspect 5 further includes: configuring a first timer length for a first timer and a second timer length for a second timer, wherein the first timer length is shorter than the second timer length.

[0158] Aspect 7: The method of aspect 6, wherein determining that the second scan procedure begins within a first time threshold includes: determining that the first timer is active.

[0159] Aspect 8: The method of any of Aspects 6 to 7, wherein determining that the second scan procedure begins within the second time threshold includes: determining that the second timer is active.

[0160] Aspect 9: The method of any of Aspects 1 to 8 further includes: activating a first timer and performing the second scan procedure at least in part based on the activation of the first timer.

[0161] Aspect 10: The method of any of Aspects 1 to 9, wherein the subset of radio frequency bands of the first radio frequency band set corresponds to the radio frequency band scanned during the first scan procedure.

[0162] Aspect 11: The method of any of Aspects 1 to 10 further includes: occupying a first radio frequency of the first radio frequency band set at least in part based on the first scan procedure; and occupying a first radio frequency of the second radio frequency band set at least in part based on the second scan procedure.

[0163] Aspect 12: The method of any of Aspects 1 to 11 further includes: determining, at least in part, that the second scan procedure has been completed based on a time threshold being met; and removing the indication of the radio frequency band subset of the first radio frequency band set based, at least in part, on the determination that the second scan procedure has been completed.

[0164] Aspect 13: An apparatus for wireless communication at a UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory, which can be executed by the processor to cause the apparatus to perform a method as described in any one of Aspects 1 to 12.

[0165] Aspect 14: An apparatus for wireless communication at a UE, comprising at least one means for performing a method as described in any one of Aspects 1 to 12.

[0166] Aspect 15: A non-transient computer-readable medium storing code for wireless communication at a UE, the code including instructions executable by a processor to perform methods as described in any one of Aspects 1 to 12.

[0167] It should be noted that the methods described in this paper describe possible implementations, and the operations and steps can be rearranged or otherwise modified, and other implementations are also possible. Furthermore, aspects from two or more methods can be combined.

[0168] While aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used in most of the description, the techniques described herein can also be applied to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques can be applied to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0169] The information and signals described herein can be represented using any of a wide variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or light particles, or any combination thereof.

[0170] The various illustrative boxes and components described herein can be implemented or executed using a general-purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but in alternatives, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors working in conjunction with a DSP core, or any other such configuration).

[0171] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored or transmitted as one or more instructions or code on a computer-readable medium. Other examples and implementations fall within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Features implementing the functions may also be physically located in various locations, including being distributed such that different parts of the function are implemented at different physical locations.

[0172] Computer-readable media includes both non-transient computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one location to another. Non-transient storage media can be any available medium accessible to a general-purpose or special-purpose computer. By way of example and not limitation, non-transient computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, magnetic disk storage or other magnetic storage devices, or any other non-transient medium that can be used to carry or store desired program code in the form of instructions or data structures and is accessible to a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Similarly, any connection is also legitimately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then that coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable media. As used in this article, disk and disc include CDs, laser discs, optical discs, DVDs, floppy disks, and Blu-ray discs, where disks often magnetically reproduce data while discs optically reproduce data using lasers. Combinations of these media are also included within the scope of computer-readable media.

[0173] As used herein (including in the claims), the word "or" in an enumeration of items (e.g., an enumeration of items accompanied by phrases such as "at least one of" or "one or more of") indicates an inclusive enumeration, such that an enumeration of at least one of, for example, A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Similarly, as used herein, the phrase "based on" should not be interpreted as referring to a closed set of conditions. For example, an example step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "at least partially based on".

[0174] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, components of the same type may be distinguished by a dash following the reference numeral and a second reference numeral used to differentiate between similar components. If only the first reference numeral is used in the description, the description may apply to any of the similar components having the same first reference numeral, regardless of the second reference numeral or other subsequent reference numerals.

[0175] This document, illustrated with reference to the accompanying drawings, describes exemplary configurations but does not represent all examples that can be implemented or fall within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration" and does not imply "superior" or "outperforming" other examples. This detailed description includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0176] The description provided herein is intended to enable those skilled in the art to make or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the universal principles defined herein can be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: performing, at a first subscription of the UE, a first scan procedure according to a default scan order over a first set of radio frequency bands; storing an indication of a subset of radio frequency bands of the first set of radio frequency bands used for the first scan procedure; and performing, at a second subscription of the UE, a second scan procedure according to a modified scan order over a second set of radio frequency bands based at least in part on the stored indication of the subset of radio frequency bands.

2. The method of claim 1, wherein performing the second scan procedure comprises: determining a relevance of the stored indication of the subset of radio frequency bands of the first set of radio frequency bands; and determining the modified scan order based at least in part on the relevance of the stored indication.

3. The method of claim 2, wherein determining the relevance of the stored indication of the subset of radio frequency bands of the first set of radio frequency bands comprises: identifying a time difference between the first scan procedure and the second scan procedure, a location of the first scan procedure and a location of the second scan procedure, or a combination thereof.

4. The method of claim 1, wherein performing the second scan procedure comprises: determining that the second scan procedure starts within a first time threshold from an end of the first scan procedure; and skipping the subset of radio frequency bands of the first set of radio frequency bands based at least in part on the indication of the subset of radio frequency bands.

5. The method of claim 4, wherein performing the second scan procedure comprises: determining that the second scan procedure starts within a second time threshold from an end of the first scan procedure; and determining the modified scan order by prioritizing scanning of radio frequency bands of the second set of radio frequency bands that are different from the subset of radio frequency bands of the first set of radio frequency bands based at least in part on the indication of the subset of radio frequency bands.

6. The method of claim 5, further comprising: configuring a first timer length for a first timer and a second timer length for a second timer, wherein the first timer length is shorter than the second timer length.

7. The method of claim 6, wherein determining that the second scan procedure starts within a first time threshold comprises: determining that the first timer is active.

8. The method of claim 6, wherein determining that the second scan procedure starts within the second time threshold comprises: determining that the second timer is active.

9. The method of claim 1, further comprising: activating a first timer and performing the second scan procedure based at least in part on activating the first timer.

10. The method of claim 1, wherein the subset of radio frequency bands of the first set of radio frequency bands corresponds to radio frequency bands scanned during the first scan procedure.

11. The method of claim 1, further comprising: camping on a first radio frequency of the first set of radio frequency bands based at least in part on the first scan procedure; ​ ​ ​ ​ and camping on a first radio frequency of the second set of radio frequency bands based at least in part on the second scan procedure.

12. The method of claim 1, further comprising: determining that the second scan procedure has completed based at least in part on a time threshold being satisfied; and removing the indication of the subset of radio frequency bands of the first set of radio frequency bands based at least in part on determining that the second scan procedure has completed.

13. An apparatus for wireless communication at a user equipment (UE), 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, at a first subscription of the UE, a first scan procedure for a first set of radio frequency bands according to a default scan order; store an indication of a subset of radio frequency bands of the first set of radio frequency bands for the first scan procedure; and perform, at a second subscription of the UE, a second scan procedure for a second set of radio frequency bands according to a modified scan order based at least in part on the stored indication of the subset of radio frequency bands.

14. The apparatus of claim 13, wherein the instructions to perform the second scan procedure are executable by the processor to cause the apparatus to: determine a relevance of the stored indication of the subset of radio frequency bands of the first set of radio frequency bands; and determine the modified scan order based at least in part on the relevance of the stored indication.

15. The apparatus of claim 14, wherein the instructions to determine the relevance of the stored indication of the subset of radio frequency bands of the first set of radio frequency bands are executable by the processor to cause the apparatus to: identify a time difference between the first scan procedure and the second scan procedure, a location of the first scan procedure and a location of the second scan procedure, or a combination thereof.

16. The apparatus of claim 13, wherein the instructions to perform the second scan procedure are executable by the processor to cause the apparatus to: determine that the second scan procedure starts within a first time threshold from an end of the first scan procedure; and skip the subset of radio frequency bands of the first set of radio frequency bands based at least in part on the indication of the subset of radio frequency bands.

17. The apparatus of claim 16, wherein the instructions to perform the second scan procedure are executable by the processor to cause the apparatus to: determine that the second scan procedure starts within a second time threshold from an end of the first scan procedure; and determine the modified scan order by prioritizing scanning of radio frequency bands of the second set of radio frequency bands that are different from the subset of radio frequency bands of the first set of radio frequency bands based at least in part on the indication of the subset of radio frequency bands.

18. The apparatus of claim 17, wherein the instructions are further executable by the processor to cause the apparatus to: configuring a first timer length for a first timer and a second timer length for a second timer, wherein the first timer length is shorter than the second timer length.

19. The apparatus of claim 18, wherein the instructions to determine that the second scan procedure starts within a first time threshold can be executed by the processor to cause the apparatus to: determine that the first timer is active.

20. The apparatus of claim 18, wherein the instructions to determine that the second scan procedure starts within the second time threshold can be executed by the processor to cause the apparatus to: determine that the second timer is active.

21. The apparatus of claim 13, wherein the instructions can be further executed by the processor to cause the apparatus to: activate a first timer and perform the second scan procedure based at least in part on activating the first timer.

22. The apparatus of claim 13, wherein the subset of radio frequency bands of the first set of radio frequency bands corresponds to radio frequency bands scanned during the first scan procedure.

23. The apparatus of claim 13, wherein the instructions can be further executed by the processor to cause the apparatus to: camp on a first radio frequency of the first set of radio frequency bands based at least in part on the first scan procedure; and camp on the first radio frequency of the second set of radio frequency bands based at least in part on the second scan procedure.

24. The apparatus of claim 13, wherein the instructions can be further executed by the processor to cause the apparatus to: determine that the second scan procedure has completed based at least in part on satisfying a time threshold; and remove the indication of the subset of radio frequency bands of the first set of radio frequency bands based at least in part on determining that the second scan procedure has completed.

25. An apparatus for wireless communication at a user equipment (UE), comprising: means for performing, at a first subscription of the UE, a first scan procedure on a first set of radio frequency bands according to a default scan order; means for storing an indication of a subset of radio frequency bands of the first set of radio frequency bands for the first scan procedure; and means for performing, at a second subscription of the UE, a second scan procedure on a second set of radio frequency bands according to a modified scan order based at least in part on the stored indication of the subset of radio frequency bands.

26. The apparatus of claim 25, wherein the means for performing the second scan procedure comprises: means for determining a relevance of the stored indication of the subset of radio frequency bands of the first set of radio frequency bands; and means for determining the modified scan order based at least in part on the relevance of the stored indication.

27. The apparatus of claim 26, wherein the means for determining the relevance of the stored indication of the subset of radio frequency bands of the first set of radio frequency bands comprises: means for determining a time threshold associated with the stored indication of the subset of radio frequency bands of the first set of radio frequency bands; and means for determining the relevance of the stored indication based at least in part on the time threshold. an apparatus to identify a time difference between the first scan procedure and the second scan procedure, a location of the first scan procedure and a location of the second scan procedure, or a combination thereof.

28. A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to: perform, at a first subscription of the UE, a first scan procedure for a first set of radio frequency bands according to a default scan order; store an indication of a subset of radio frequency bands of the first set of radio frequency bands for the first scan procedure; and perform, at a second subscription of the UE, a second scan procedure for a second set of radio frequency bands according to a modified scan order based at least in part on the stored indication of the subset of radio frequency bands.

29. The non-transitory computer-readable medium of claim 28, wherein the instructions to perform the second scan procedure are executable to: determine a relevance of the stored indication of the subset of radio frequency bands of the first set of radio frequency bands; and determine the modified scan order based at least in part on the relevance of the stored indication.

30. The non-transitory computer-readable medium of claim 29, wherein the instructions to determine the relevance of the stored indication of the subset of radio frequency bands of the first set of radio frequency bands are executable to: identify a time difference between the first scan procedure and the second scan procedure, a location of the first scan procedure and a location of the second scan procedure, or a combination thereof.

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