Techniques for uplink performance optimization in dual-carrier operation

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may communicate on a primary carrier using a first antenna port. The UE may communicate on a secondary carrier using a second antenna port. The UE may determine whether to switch the secondary carrier from the second antenna port to the first antenna port based on channel conditions associated with the second antenna port. The UE may switch the secondary carrier from the second antenna port to the first antenna port based on a determination to switch the secondary carrier from the second antenna port to the first antenna port. Many other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 62 / 705,900, filed on July 21, 2020, entitled “TECHNIQUES FOR UPLINK PERFORMANCE OPTIMIZATION IN DUAL CARRIER OPERATION,” and U.S. Non-Provisional Patent Application No. 17 / 248,472, filed on January 26, 2021, entitled “TECHNIQUES FOR UPLINK PERFORMANCE OPTIMIZATION IN DUAL CARRIER OPERATION,” which are expressly incorporated herein by reference. Technical Field

[0003] Aspects of the present disclosure generally relate to wireless communications and techniques and apparatus for uplink performance optimization in dual-carrier operation. Background Art

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

[0005] A wireless network may include multiple base stations (BSs) that can support communication for multiple user equipment (UEs). UEs can communicate with a BS via downlinks and uplinks. A downlink (or forward link) refers to the communication link from the BS to the UE, and an uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit receive point (TRP), new radio (NR) BS, 5G Node B, etc.

[0006] The aforementioned multiple access technologies have been adopted across various telecommunications standards to provide a common protocol that enables diverse user devices to communicate at the city, national, regional, and even global levels. NR, also known as 5G, is a set of enhancements to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband internet access by increasing spectral efficiency, reducing costs, improving services, leveraging new spectrum, and better integrating with other open standards. These open standards use orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL) and CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), as well as support for beamforming, multiple-input, multiple-output (MIMO) antenna technology, and carrier aggregation. As demand for mobile broadband access continues to grow, further improvements in LTE, NR, and other wireless access technologies remain highly valuable. Summary of the Invention

[0007] In some aspects, a wireless communication method performed by a UE includes: communicating on a primary carrier using a first antenna port; communicating on a secondary carrier using a second antenna port; determining whether to switch the secondary carrier from the second antenna port to the first antenna port based on a channel condition associated with the second antenna port; and switching the secondary carrier from the second antenna port to the first antenna port based on the determination to switch the secondary carrier from the second antenna port to the first antenna port.

[0008] In some aspects, the method includes switching the primary carrier from the first antenna port to the second antenna port based on the determination to switch the secondary carrier from the second antenna port to the first antenna port.

[0009] In some aspects, determining whether to switch the secondary carrier from the second antenna port to the first antenna port includes determining that a channel condition associated with the second antenna port meets a threshold for communicating using the primary carrier, and determining whether to switch the secondary carrier from the second antenna port to the first antenna port based on determining that the channel condition associated with the second antenna port meets the threshold for communicating using the primary carrier.

[0010] In some aspects, the threshold is associated with at least one of: a block error rate associated with the second antenna port, a received signal strength indicator associated with the second antenna port, or a signal-to-noise ratio associated with the second antenna port.

[0011] In some aspects, determining whether to switch the secondary carrier from the second antenna port to the first antenna port is further based on a UE benefit associated with switching the secondary carrier from the second antenna port to the first antenna port.

[0012] In some aspects, UE benefit is associated with at least one of increasing transmit power, increasing throughput, or improving call sustainability.

[0013] In some aspects, determining whether to switch the secondary carrier from the second antenna port to the first antenna port is further based on information associated with resource allocations of the primary carrier and information associated with resource allocations of the secondary carrier.

[0014] In some aspects, the method includes, after switching the secondary carrier from the second antenna port to the first antenna port, determining whether to switch the secondary carrier from the first antenna port to the second antenna port based on another channel condition associated with the second antenna port, and switching the secondary carrier from the first antenna port to the second antenna port based on the determination to switch the secondary carrier from the first antenna port to the first antenna port.

[0015] In some aspects, the method includes switching the primary carrier from the second antenna port to the first antenna port based on the determination to switch the secondary carrier from the first antenna port to the second antenna port.

[0016] In some aspects, determining whether to switch the secondary carrier from the first antenna port to the second antenna port based on the other channel conditions includes determining that the other channel conditions associated with the second antenna port cannot meet a threshold for communicating using the primary carrier, and determining to switch the secondary carrier from the first antenna port to the second antenna port based on determining that the other channel conditions associated with the second antenna port cannot meet the threshold for communicating using the primary carrier.

[0017] In some aspects, the determination of whether to switch the secondary carrier from the first antenna port to the second antenna port is triggered based on expiration of a timer.

[0018] In some aspects, the determination of whether to switch the secondary carrier from the first antenna port to the second antenna port is triggered based on detection of the event.

[0019] In some aspects, the UE operates in dual connectivity (DC) mode, the primary carrier is an anchor carrier associated with the DC mode, and the secondary carrier is a non-anchor carrier associated with the DC mode.

[0020] In some aspects, the primary carrier is an LTE carrier and the secondary carrier is an NR carrier.

[0021] In some aspects, the UE operates in dual subscriber identity module (SIM) dual active mode, with a primary carrier associated with a first SIM and a secondary carrier associated with a second SIM.

[0022] In some aspects, a UE for wireless communication includes a memory and one or more processors operably coupled to the memory, the memory and the one or more processors configured to: communicate on a primary carrier using a first antenna port; communicate on a secondary carrier using a second antenna port; determine whether to switch the secondary carrier from the second antenna port to the first antenna port based on a channel condition associated with the second antenna port; and switch the secondary carrier from the second antenna port to the first antenna port based on the determination to switch the secondary carrier from the second antenna port.

[0023] In some aspects, the one or more processors are further configured to switch the primary carrier from the first antenna port to the second antenna port based on the determination to switch the secondary carrier from the second antenna port to the first antenna port.

[0024] In some aspects, the one or more processors are configured to, when determining whether to switch the secondary carrier from the second antenna port to the first antenna port: determine that a channel condition associated with the second antenna port meets a threshold for communicating using the primary carrier, and determine whether to switch the secondary carrier from the second antenna port to the first antenna port based on determining that the channel condition associated with the second antenna port meets the threshold for communicating using the primary carrier.

[0025] In some aspects, the threshold is associated with at least one of: a block error rate associated with the second antenna port, a received signal strength indicator associated with the second antenna port, or a signal-to-noise ratio associated with the second antenna port.

[0026] In some aspects, determining whether to switch the secondary carrier from the second antenna port to the first antenna port is further based on a UE benefit associated with switching the secondary carrier from the second antenna port to the first antenna port.

[0027] In some aspects, UE benefit is associated with at least one of increasing transmit power, increasing throughput, or improving call sustainability.

[0028] In some aspects, determining whether to switch the secondary carrier from the second antenna port to the first antenna port is further based on information associated with resource allocations of the primary carrier and information associated with resource allocations of the secondary carrier.

[0029] In some aspects, the one or more processors are further configured to, after switching the secondary carrier from the second antenna port to the first antenna port, determine whether to switch the secondary carrier from the first antenna port to the second antenna port based on another channel condition associated with the second antenna port, and switch the secondary carrier from the first antenna port to the second antenna port based on the determination to switch the secondary carrier from the first antenna port to the first antenna port.

[0030] In some aspects, the one or more processors are further configured to switch the primary carrier from the second antenna port to the first antenna port based on the determination to switch the secondary carrier from the first antenna port to the second antenna port.

[0031] In some aspects, the one or more processors are configured to, when determining whether to switch the secondary carrier from the first antenna port to the second antenna port based on another channel condition, determine that the another channel condition associated with the second antenna port fails to meet a threshold for communicating using the primary carrier, and determine to switch the secondary carrier from the first antenna port to the second antenna port based on the determination that the another channel condition associated with the second antenna port fails to meet the threshold for communicating using the primary carrier.

[0032] In some aspects, the determination of whether to switch the secondary carrier from the first antenna port to the second antenna port is triggered based on expiration of a timer.

[0033] In some aspects, the determination of whether to switch the secondary carrier from the first antenna port to the second antenna port is triggered based on detection of the event.

[0034] In some aspects, the UE operates in DC mode, the primary carrier is an anchor carrier associated with the DC mode, and the secondary carrier is a non-anchor carrier associated with the DC mode.

[0035] In some aspects, the primary carrier is an LTE carrier and the secondary carrier is an NR carrier.

[0036] In some aspects, the UE operates in dual SIM dual active mode with a primary carrier associated with a first SIM and a secondary carrier associated with a second SIM.

[0037] In some aspects, a non-transitory computer-readable medium storing one or more instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the one or more processors to: communicate on a primary carrier using a first antenna port; communicate on a secondary carrier using a second antenna port; determine, based on a channel condition associated with the second antenna port, whether to switch the secondary carrier from the second antenna port to the first antenna port; and switch the secondary carrier from the second antenna port to the first antenna port based on a determination to switch the secondary carrier from the second antenna port to the first antenna port.

[0038] In some aspects, the one or more instructions, when executed by one or more processors, further cause the one or more processors to switch the primary carrier from the first antenna port to the second antenna port based on the determination to switch the secondary carrier from the second antenna port to the first antenna port.

[0039] In some aspects, when causing the one or more processors to determine whether to switch the secondary carrier from the second antenna port to the first antenna port, the one or more instructions cause the one or more processors to: determine that a channel condition associated with the second antenna port satisfies a threshold for communicating using the primary carrier, and determine whether to switch the secondary carrier from the second antenna port to the first antenna port based on determining that the channel condition associated with the second antenna port satisfies the threshold for communicating using the primary carrier.

[0040] In some aspects, the threshold is associated with at least one of: a block error rate associated with the second antenna port, a received signal strength indicator associated with the second antenna port, or a signal-to-noise ratio associated with the second antenna port.

[0041] In some aspects, determining whether to switch the secondary carrier from the second antenna port to the first antenna port is further based on a UE benefit associated with switching the secondary carrier from the second antenna port to the first antenna port.

[0042] In some aspects, UE benefit is associated with at least one of increasing transmit power, increasing throughput, or improving call sustainability.

[0043] In some aspects, determining whether to switch the secondary carrier from the second antenna port to the first antenna port is further based on information associated with resource allocations of the primary carrier and information associated with resource allocations of the secondary carrier.

[0044] In some aspects, when the one or more instructions are executed by one or more processors, the one or more processors are further caused to: after switching the secondary carrier from the second antenna port to the first antenna port, determine whether to switch the secondary carrier from the first antenna port to the second antenna port based on another channel condition associated with the second antenna port, and switch the secondary carrier from the first antenna port to the second antenna port based on the determination to switch the secondary carrier from the first antenna port to the first antenna port.

[0045] In some aspects, the one or more instructions, when executed by one or more processors, further cause the one or more processors to switch the primary carrier from the second antenna port to the first antenna port based on the determination to switch the secondary carrier from the first antenna port to the second antenna port.

[0046] In some aspects, when causing the one or more processors to determine whether to switch the secondary carrier from the first antenna port to the second antenna port based on other channel conditions, the one or more instructions cause the one or more processors to: determine that the other channel condition associated with the second antenna port fails to meet a threshold for communicating using the primary carrier, and determine to switch the secondary carrier from the first antenna port to the second antenna port based on the determination that another channel condition associated with the second antenna port fails to meet the threshold for communicating using the primary carrier.

[0047] In some aspects, the determination of whether to switch the secondary carrier from the first antenna port to the second antenna port is triggered based on expiration of a timer.

[0048] In some aspects, the determination of whether to switch the secondary carrier from the first antenna port to the second antenna port is triggered based on detection of the event.

[0049] In some aspects, the UE operates in DC mode, the primary carrier is an anchor carrier associated with the DC mode, and the secondary carrier is a non-anchor carrier associated with the DC mode.

[0050] In some aspects, the primary carrier is an LTE carrier and the secondary carrier is an NR carrier.

[0051] In some aspects, the UE operates in dual SIM dual active mode with a primary carrier associated with a first SIM and a secondary carrier associated with a second SIM.

[0052] In some aspects, an apparatus for wireless communication includes: means for communicating on a primary carrier using a first antenna port; means for communicating on a secondary carrier using a second antenna port; means for determining whether to switch the secondary carrier from the second antenna port to the first antenna port based on a channel condition associated with the second antenna port; and means for switching the secondary carrier from the second antenna port to the first antenna port based on a determination to switch the secondary carrier from the second antenna port to the first antenna port.

[0053] In some aspects, the apparatus includes means for switching the primary carrier from the first antenna port to the second antenna port based on the determination to switch the secondary carrier from the second antenna port to the first antenna port.

[0054] In some aspects, the means for determining whether to switch the secondary carrier from the second antenna port to the first antenna port includes: means for determining that a channel condition associated with the second antenna port meets a threshold for communicating using the primary carrier, and means for determining whether to switch the secondary carrier from the second antenna port to the first antenna port based on the determination that the channel condition associated with the second antenna port meets the threshold for communicating using the primary carrier.

[0055] In some aspects, the threshold is associated with at least one of: a block error rate associated with the second antenna port, a received signal strength indicator associated with the second antenna port, or a signal-to-noise ratio associated with the second antenna port.

[0056] In some aspects, determining whether to switch the secondary carrier from the second antenna port to the first antenna port is further based on a UE benefit associated with switching the secondary carrier from the second antenna port to the first antenna port.

[0057] In some aspects, UE benefit is associated with at least one of increasing transmit power, increasing throughput, or improving call sustainability.

[0058] In some aspects, determining whether to switch the secondary carrier from the second antenna port to the first antenna port is further based on information associated with resource allocations of the primary carrier and information associated with resource allocations of the secondary carrier.

[0059] In some aspects, the apparatus includes means for determining, after switching the secondary carrier from the second antenna port to the first antenna port, whether to switch the secondary carrier from the first antenna port to the second antenna port based on another channel condition associated with the second antenna port, and means for switching the secondary carrier from the first antenna port to the second antenna port based on the determination to switch the secondary carrier from the first antenna port to the first antenna port.

[0060] In some aspects, the apparatus includes means for switching the primary carrier from the second antenna port to the first antenna port based on the determination to switch the secondary carrier from the first antenna port to the second antenna port.

[0061] In some aspects, the means for determining whether to switch the secondary carrier from the first antenna port to the second antenna port based on the other channel conditions includes: means for determining that the other channel conditions associated with the second antenna port fail to meet a threshold for communicating using the primary carrier, and means for determining to switch the secondary carrier from the first antenna port to the second antenna port based on the determination that the other channel conditions associated with the second antenna port fail to meet the threshold for communicating using the primary carrier.

[0062] In some aspects, the determination of whether to switch the secondary carrier from the first antenna port to the second antenna port is triggered based on expiration of a timer.

[0063] In some aspects, the determination of whether to switch the secondary carrier from the first antenna port to the second antenna port is triggered based on detection of the event.

[0064] In some aspects, the UE operates in DC mode, the primary carrier is an anchor carrier associated with the DC mode, and the secondary carrier is a non-anchor carrier associated with the DC mode.

[0065] In some aspects, the primary carrier is an LTE carrier and the secondary carrier is an NR carrier.

[0066] In some aspects, the UE operates in dual SIM dual active mode with a primary carrier associated with a first SIM and a secondary carrier associated with a second SIM.

[0067] The aspects generally include methods, apparatuses, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as substantially described herein with reference to and illustrated by the figures and description.

[0068] The features and technical advantages of the examples according to the present disclosure have been outlined in a rather broad manner so that the detailed description that follows may be better understood. Additional features and advantages will be described below. The concepts and specific examples disclosed may be readily used as a basis for modifying or designing other structures for achieving the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the concepts disclosed herein, their organization and method of operation, and related advantages will be better understood from the following description when considered in conjunction with the accompanying drawings. Each of the figures is provided for the purpose of illustration and description and not as a definition of limitations to the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to enable a detailed understanding of the above-described features of the present disclosure, reference may be made to a more particular description of some aspects briefly summarized above, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of the present disclosure and are therefore not to be considered limiting of its scope, as the description may admit to other equally effective aspects. The same reference numerals in different drawings may represent the same or similar elements.

[0070] Figure 1 is a diagram illustrating an example of a wireless network according to various aspects of the present disclosure.

[0071] Figure 2 is a diagram illustrating an example of a base station communicating with a UE in a wireless network according to various aspects of the present disclosure.

[0072] Figure 3A and 3B is a diagram illustrating examples associated with uplink performance optimization in dual-carrier operation according to various aspects of the present disclosure.

[0073] Figure 4 is a diagram illustrating example procedures associated with uplink performance optimization in dual-carrier operation according to various aspects of the present disclosure.

[0074] Figure 5 is a block diagram of an example apparatus for wireless communication in accordance with various aspects of the present disclosure.

[0075] Figure 6 is a block diagram of an example apparatus for wireless communication in accordance with various aspects of the present disclosure. DETAILED DESCRIPTION

[0076] The various aspects of the present disclosure will be described more fully below with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms and should not be construed as being limited to any specific structure or function presented throughout the present disclosure. On the contrary, these aspects are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art should understand that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether implemented independently of any other aspect of the present disclosure or implemented in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein can be used to implement an apparatus or practice method. In addition, the scope of the present disclosure is intended to cover such an apparatus or method that is practiced using other structures, functions, or structures and functions in addition to or different from the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be embodied by one or more elements of the claims.

[0077] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively, "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0078] It should be noted that although terms generally associated with 5G or NR radio access technologies (RATs) may be used herein to describe various aspects, various aspects of the present disclosure may be applied to other RATs, such as 3G RATs, 4G RATs, and / or RATs beyond 5G (e.g., 6G).

[0079] Figure 1 is a schematic diagram illustrating an example of a wireless network 100 according to various aspects of the present disclosure. The wireless network 100 may be or may include elements of a 5G (NR) network, an LTE network, etc. The wireless network 100 may include multiple base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with a user equipment (UE) and may also be referred to as an NR BS, a Node B, a gNB, a 5G Node B (NB), an access point, a transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0080] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access to UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access to UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown, BS 110a may be a macro BS for macrocell 102a, BS 110b may be a pico BS for picocell 102b, and BS 110c may be a femto BS for femtocell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB," "base station," "NR BS," "gNB," "TRP," "AP," "Node B," "5G NB," and "cell" may be used interchangeably herein.

[0081] In some aspects, the cells are not necessarily stationary, and the geographic area of ​​the cells can move depending on the location of the mobile BS. In some aspects, the BSs can be interconnected with each other and / or with one or more other BSs or network nodes (not shown) in the wireless network 100 using any suitable transmission network, through various types of backhaul interfaces, such as direct physical connections, virtual networks, etc.

[0082] The wireless network 100 may also include a relay station. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and send data transmissions to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown, relay BS 110d may communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay BS may also be referred to as a relay station, relay base station, relay, etc.

[0083] The wireless network 100 may be a heterogeneous network that includes different types of BSs, such as macro BSs, pico BSs, femto BSs, relay BSs, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0084] The network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may communicate with each other directly or indirectly via a wireless or wired backhaul.

[0085] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be fixed or mobile. A UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. A UE may be a cellular phone (e.g., a smartphone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biosensor / device, a wearable device (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring, a smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0086] Some UEs may be considered machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a base station, another device (e.g., a remote device), or some other entity. For example, a wireless node may provide connectivity to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered Internet of Things (IoT) devices and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered customer premises equipment (CPE). UE 120 may be included in a housing that houses components of UE 120 (such as a processor component, a memory component, etc.). In some aspects, the processor component and the memory component may be coupled together. For example, a processor component (e.g., one or more processors) and a memory component (e.g., a memory) may be operably coupled, communicatively coupled, electronically coupled, electrically coupled, etc.

[0087] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific RAT and operate on one or more frequencies. RATs are also referred to as radio technologies, air interfaces, etc. Frequencies are also referred to as carriers, frequency channels, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0088] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary for communicating with each other). For example, the UEs 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, etc. In such cases, the UEs 120 may perform scheduling operations, resource selection operations, and / or other operations performed by the base station 110 as described elsewhere herein.

[0089] Devices in wireless network 100 can communicate using an electromagnetic spectrum, which can be subdivided into various categories, bands, channels, etc. based on frequency or wavelength. For example, devices in wireless network 100 can communicate using an operating frequency band having a first frequency range (FR1) from 410 MHz to 7.125 GHz, and / or using an operating frequency band having a second frequency range (FR2) from 24.25 GHz to 52.6 GHz. Frequencies between FR1 and FR2 are sometimes referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to as the "sub-6 GHz" band. Similarly, FR2 is often referred to as the "millimeter wave" band, although it is different from the extremely high frequency (EHF) band (30 GHz–300 GHz) designated as the "millimeter wave" band by the International Telecommunication Union (ITU). Therefore, unless otherwise specified, it should be understood that the terms "sub-6 GHz," etc., when used herein, can broadly refer to frequencies less than 6 GHz, frequencies within FR1, and / or mid-band frequencies (e.g., greater than 7.125 GHz). Similarly, unless otherwise stated, it should be understood that the term "millimeter wave," etc., if used herein, can broadly refer to frequencies within the EHF band, frequencies within FR2, and / or mid-band frequencies (e.g., less than 24.25 GHz). It is contemplated that the frequencies included in FR1 and FR2 may be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0090] As mentioned above, Figure 1 are provided as examples. Other examples may differ from those described in Figure 1 described.

[0091] Figure 2 is a diagram illustrating an example 200 of a base station 110 communicating with a UE 120 in a wireless network 100 according to various aspects of the present disclosure. The base station 110 may be equipped with T antennas 234a through 234t, and the UE 120 may be equipped with R antennas 252a through 252r, where in general T ≥ 1 and R ≥ 1.

[0092] At base station 110, transmit processor 220 may receive data for one or more UEs from data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for that UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) and control information (e.g., CQI requests, grants, upper layer signaling, etc.) and provide overhead symbols and control symbols. Transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS), demodulation reference signals (DMRS), etc.) and synchronization signals (e.g., primary synchronization signal (PSS) and secondary synchronization signal (SSS)). A transmit (TX) multiple-input, multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​the data symbols, control symbols, overhead symbols, and / or reference symbols (if applicable), and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.

[0093] At UE 120, antennas 252a through 252r may receive downlink signals from base station 110 and / or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The term "controller / processor" may refer to one or more controllers, one or more processors, or a combination thereof. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of the UE 120 may be included in the housing 284.

[0094] The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292. The network controller 130 may include, for example, one or more devices in a core network. The network controller 130 may communicate with the base station 110 via the communication unit 294.

[0095] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. If applicable, the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. In some aspects, the UE 120 includes a transceiver. The transceiver may include any combination of antenna(s) 252, a modulator and / or demodulator 254, a MIMO detector 256, a receive processor 258, a transmit processor 264, and / or a TX MIMO processor 266. A processor (eg, controller / processor 280 ) and memory 282 may use a transceiver to perform aspects of any of the methods described herein.

[0096] At base station 110, uplink signals from UE 120 and other UEs may be received by antenna 234, processed by demodulator 232, detected by MIMO detector 236 (if applicable), and further processed by receive processor 238 to obtain decoded data and control information sent by UE 120. Receive processor 238 may provide decoded data to a data sink 239 and decoded control information to controller / processor 240. Base station 110 may include a communication unit 244 and communicate with network controller 130 via communication unit 244. Base station 110 may include a scheduler 246 for scheduling UE 120 for downlink and / or uplink communications. In some aspects, base station 110 includes a transceiver. The transceiver may include any combination of antenna(s) 234, modulator and / or demodulator 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. A processor (eg, controller / processor 240 ) and memory 242 may use a transceiver to perform aspects of any of the methods described herein.

[0097] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component(s) of the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or the like may perform one or more techniques associated with uplink performance optimization in dual carrier operation, as described in more detail elsewhere herein. Figure 2 Any other component(s) may perform or direct e.g. Figure 4 4 and / or other processes described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, when one or more instructions are executed (e.g., directly or after compilation, conversion, interpretation, etc.) by one or more processors of base station 110 and / or UE 120, the one or more processors, UE 120, and / or base station 110 may be caused to perform or direct, for example, Figure 4 In some aspects, executing instructions may include running instructions, converting instructions, compiling instructions, interpreting instructions, etc.

[0098] In some aspects, the UE 120 may include means for communicating on a primary carrier using a first antenna port; means for communicating on a secondary carrier using a second antenna port; means for determining whether to switch the secondary carrier from the second antenna port to the first antenna port based on a channel condition associated with the second antenna port; means for switching the secondary carrier from the second antenna port to the first antenna port based on a determination to switch the secondary carrier from the second antenna port to the first antenna port; and the like. In some aspects, such means may include means for combining Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and the like.

[0099] As mentioned above, Figure 2 are provided as examples. Other examples may differ from those described in Figure 2 described.

[0100] A UE (e.g., UE 120) is capable of operating in a mode that allows the UE to communicate using two frequency carriers simultaneously. Such an operating mode is referred to herein as a dual-carrier operating mode or a dual-connectivity operating mode. For example, such a UE may communicate with a first base station (e.g., a first base station 110 associated with a first radio access technology (RAT)) using a first carrier, and may communicate with a second base station (e.g., a second base station 110 associated with the first RAT or a second RAT) using a second carrier.

[0101] A specific example of a dual-carrier operation mode is the so-called non-standalone (NSA) operation mode, in which the UE communicates using an anchor carrier and a non-anchor carrier. Typically, the anchor carrier supports control plane functions (e.g., call origination, call termination, location registration, etc.) and possibly some user plane functions (e.g., exchange of data services), while the non-anchor carrier primarily supports user plane functions. In a specific example of the NSA operation mode, the anchor carrier is an LTE carrier and the non-anchor carrier is an NR carrier (e.g., a millimeter wave (mmW) carrier, a sub-6 GHz carrier, etc.). This LTE+NR NSA operation mode is called the Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA)-NR Dual Connectivity (ENDC) operation mode. In another example of the NSA operation mode, the anchor carrier may be an NR carrier and the non-anchor carrier may be an LTE carrier. In yet another example of the NSA operation mode, the anchor carrier may be a first LTE carrier and the non-anchor carrier may be a second LTE carrier. In yet another example of the NSA operation mode, the anchor carrier may be a first NR carrier and the non-anchor carrier may be a second NR carrier. It is worth noting that the above examples are provided for illustration purposes, and in practice, the UE may be configured for another type of NSA operation mode (e.g., an NSA operation mode associated with a RAT other than LTE and NR).

[0102] Another specific example of a dual-carrier operating mode is the so-called Dual Subscriber Identity Module Dual Active (DSDA) operating mode. For example, some UEs may be equipped with dual Subscriber Identity Module (SIM) cards, each storing a corresponding International Mobile Subscriber Identity (IMSI) number and a key associated with providing identification and authentication of the UE. In the DSDA operating mode, such a UE may be allowed to communicate using two SIMs simultaneously on two different carriers. Here, the two carriers may be associated with the same RAT or different RATs.

[0103] Typically, in a dual-carrier mode of operation, one carrier has priority over the other (e.g., in terms of access to UE resources). For example, in an NSA mode of operation, the anchor carrier has priority over the non-anchor carrier in terms of receive chain selection, transmit antenna selection, antenna switching decisions, uplink power sharing, etc. As a specific example, a UE may have multiple antennas (e.g., two antennas, four antennas, eight antennas, etc.) and may be configured to operate in an ENDC mode of operation (i.e., an NSA mode of operation in which the anchor carrier is an LTE carrier and the non-anchor carrier is an NR carrier, such as a sub-6 GHz carrier). In the ENDC mode of operation, the UE may be allowed to use all antennas to receive communications on the anchor carrier and to receive communications on the non-anchor carrier. However, the UE may be allowed to use only a specific one of the multiple antennas to transmit communications on a given carrier. To identify which antenna the anchor carrier will use (before establishing a link associated with the non-anchor carrier), the UE may observe the channel conditions associated with the antennas. The UE then identifies the best available antenna (e.g., the antenna with the most favorable channel conditions) and assigns the antenna port associated with the best available antenna to the anchor carrier (where a given antenna port corresponds to a specific transmit antenna, as the UE can receive communications on all antennas). When establishing a link associated with a non-anchor carrier (e.g., at a later time), the UE may identify which antenna the non-anchor carrier will use. Here, the UE may observe the channel conditions associated with the available antennas, or use previously observed channel conditions. The UE then identifies the best remaining available antenna (e.g., the available antenna with the most favorable channel conditions) and assigns the antenna port associated with the best remaining available antenna to the non-anchor carrier. In this shared multi-antenna scenario, the anchor carrier is assigned the antenna port associated with the best available antenna, while the non-anchor NR carrier is assigned the antenna port associated with the next best available antenna. It is worth noting that in some cases, the number of antennas available for reception or transmission on a given carrier may be limited based on whether the carrier is a low-band carrier, a mid-band carrier, or a high-band carrier.

[0104] Due to losses associated with the UE's hardware design, such as insertion loss, trace loss, etc., the maximum transmit power limit (MTPL) varies between the UE's antennas. This variation in MTPL affects the performance of the dual-carrier mode of operation. For example, in a scenario where an ENDC UE has antennas 1, 2, 3, and 4, the UE may observe channel conditions that indicate that antenna 1 (corresponding to antenna port A) is the best available antenna, while antenna 2 (corresponding to antenna port B) is the second best available antenna. Following the above example, antenna port A will be assigned to the LTE carrier (i.e., the anchor carrier), while antenna port B will be assigned to the NR carrier (i.e., the non-anchor carrier), because the LTE carrier actually has priority over the NR carrier with respect to antenna port selection. In this scenario, assume that antenna 1 has a higher MTPL (e.g., 25 decibel milliwatts (dBm)) than the MTPL of antenna 2 (e.g., 22 dBm).

[0105] In such scenarios, prioritizing LTE carriers over NR may impact performance. For example, because most data traffic may use NR carriers, there may be a large number of grants on the NR carrier, but no or few grants on the LTE carrier. In addition, due to the nature of NR frequencies, NR carriers may experience relatively higher path loss than LTE carriers. One option to overcome the path loss on the NR carrier is to increase the transmit power on the NR carrier. However, because the LTE carrier has a higher priority in antenna port selection (for example, because the LTE carrier is assigned antenna port A), the NR carrier is forced to use a suboptimal transmit antenna (corresponding to antenna port B), which means that the transmit power on the NR carrier is limited (for example, compared to the allowable transmit power on the LTE carrier), which suppresses performance on the NR carrier. In addition, because there are no or few grants on the LTE carrier and the path loss on the LTE carrier is relatively low, the LTE carrier is able to use the suboptimal antenna port without any impact on the service. That is, the best transmit antenna (corresponding to antenna port A) is not necessarily required to support communications on the LTE carrier. Instead, the NR carriers can better utilize the best transmit antenna.

[0106] Some aspects described herein provide techniques and apparatus for uplink performance optimization in dual carrier operation. In some aspects, a UE may communicate on a primary carrier (e.g., an anchor carrier) using a first antenna port (e.g., corresponding to a best available transmit antenna) and may communicate on a secondary carrier (e.g., a non-anchor carrier) using a second antenna port (e.g., corresponding to a second best available transmit antenna). In some aspects, the UE may determine whether to switch the secondary carrier from the second antenna port to the first antenna port based on a channel condition associated with the second antenna port, and may switch the secondary carrier from the second antenna port to the first antenna port accordingly. As described in further detail below, in some aspects, the UE may determine that the channel condition associated with the second antenna port satisfies a threshold (e.g., a threshold associated with determining whether the primary carrier is able to maintain a link on the second antenna port), and may trigger antenna switching accordingly.

[0107] In this way, a secondary carrier (e.g., a carrier with a relatively high allocation or transmit power requirement) can be allowed to use the best available antenna, thereby allowing the secondary carrier to be assigned to an antenna port that allows transmission at a higher transmit power while avoiding performance impact on the primary carrier. This improves the overall performance, achievable throughput, and call sustainability associated with the UE when operating in dual-carrier mode.

[0108] Figure 3A and 3B is a diagram illustrating an example 300 associated with uplink performance optimization in dual carrier operation according to various aspects of the present disclosure. Figure 3A and 3B As shown, example 300 includes communications between a UE (e.g., UE 120), a first base station (e.g., first BS 110 identified as BS1), and a second base station (e.g., second BS 110 identified as BS2). In some aspects, the first and second base stations can be associated with the same RAT (e.g., LTE, NR, etc.) or different RATs. In some aspects, the UE, the first base station, and the second base station can be included in a wireless network, such as wireless network 100. The first and second base stations and the UE can communicate on first and second radio access links, respectively, each of which can include an uplink and a downlink.

[0109] As shown in reference numeral 302, the UE can use a first antenna port to communicate on a primary carrier (e.g., to communicate with a first base station). Here, the first antenna port corresponds to the UE's first transmit antenna. The first antenna port is identified as Port A in example 300. Similarly, as shown in reference numeral 304, the UE can use a second antenna port to communicate on a secondary carrier (e.g., to communicate with a second base station). Here, the second antenna port corresponds to the UE's second transmit antenna. The second antenna port is identified as Port B in example 300.

[0110] In some aspects, the UE may operate in an NSA mode of operation. For example, the UE may operate in an ENDC mode of operation. When the UE operates in NSA mode, the primary carrier is the anchor carrier and the secondary carrier is the non-anchor carrier. Alternatively, in some aspects, the UE may be a dual-SIM UE operating in a DSDA mode of operation, which allows the UE to communicate using two different carriers.

[0111] In some aspects, the primary carrier and the secondary carrier are associated with different RATs. For example, the primary carrier may be an LTE carrier and the secondary carrier may be an NR carrier (e.g., when the UE is operating in ENDC mode of operation). As another example, the primary carrier may be an NR carrier and the secondary carrier may be an LTE carrier. In some aspects, the primary carrier and the secondary carrier are associated with the same RAT. For example, the primary carrier may be a first LTE carrier and the secondary carrier may be a second LTE carrier. As another example, the primary carrier may be a first NR carrier and the secondary carrier may be a second NR carrier.

[0112] In some aspects, after the UE begins communicating on the primary carrier, the UE begins communicating on the secondary carrier. For example, a link using the primary carrier can be established between the UE and the first base station. In association with establishing the link using the primary carrier, the UE can identify the first transmit antenna as the best available antenna and can assign the first antenna port (port A, which corresponds to the first transmit antenna) to the primary carrier. Thus, the antenna port associated with the best available antenna is assigned to the primary carrier. Continuing with this example, after the link using the primary carrier is established, a link using the secondary carrier is established between the UE and the second base station. In association with establishing the link using the secondary carrier, the UE can identify the second transmit antenna as the best remaining available antenna and can assign the second antenna port (port B, which corresponds to the second transmit antenna) to the secondary carrier.

[0113] In some aspects, when the UE begins operating in NSA mode, a link using a secondary carrier may be established. For example, when the UE is an ENDC UE, the UE may first establish a link associated with an LTE carrier. Here, upon detecting a trigger to begin operating in ENDC mode, the UE may establish a link using an NR carrier.

[0114] Notably, in the scenarios illustrated by reference numerals 302 and 304, the primary carrier (e.g., anchor carrier) is assigned the antenna port associated with the best available antenna, while the secondary carrier (e.g., non-anchor carrier) is assigned the antenna port associated with the best remaining available antenna.

[0115] In some aspects, as indicated by reference numeral 306, the UE may determine whether to switch the secondary carrier from the second antenna port (port B) to the first antenna port (port A). In some aspects, the UE may determine whether to switch the secondary carrier from the second antenna port to the first antenna port based on channel conditions associated with the second antenna port. For example, in the NSA mode of operation, the UE may determine whether to switch the non-anchor carrier from the second antenna port to the first antenna port.

[0116] In some aspects, the determination of whether to switch the secondary carrier to the first antenna port is based at least in part on a determination of whether the primary carrier can maintain a link on the second antenna port. Thus, in some aspects, the determination of whether to switch the secondary carrier is based at least in part on whether the channel conditions on the second antenna port indicate that the second antenna port will provide sufficient support for communications on the primary carrier. That is, in some aspects, the UE may determine whether the primary carrier can maintain a link on the second antenna port based on the channel conditions associated with the second antenna port. In some aspects, the channel conditions associated with the second antenna port may be based on one or more metrics associated with the second antenna port. The one or more metrics may include, for example, a block error rate (BLER) associated with the second antenna port, a received signal strength indicator (RSSI) associated with the second antenna port, a signal-to-noise ratio (SNR) associated with the second antenna port, and / or another metric indicating the channel conditions at the second antenna port. In some aspects, the channel conditions may be the result of applying a function to the one or more metrics.

[0117] In some aspects, the UE may determine whether to switch the secondary carrier from the second antenna port to the first antenna port by determining whether the channel conditions associated with the second antenna port meet a threshold for communicating on the primary carrier. The threshold for communicating on the primary carrier may be a threshold associated with determining whether the primary carrier is able to maintain a link on the second antenna port. In some aspects, the threshold is associated with one or more metrics associated with the second antenna port. For example, the threshold may include a BLER threshold (e.g., 5% BLER), an RSSI threshold (e.g., 80 dBm RSSI), an SNR threshold (e.g., 5 dBm SNR), and / or a threshold of a function that operates based on BLER, RSSI, SNR, and / or one or more other metrics.

[0118] In some aspects, the UE may determine one or more metrics associated with the second antenna port (e.g., by performing one or more measurements associated with the UE's antennas), and may determine a channel condition associated with the second antenna port based at least in part on the one or more metrics. The UE may then determine whether the channel condition associated with the second antenna port satisfies a threshold. Here, if the UE determines that the channel condition associated with the second antenna port satisfies the threshold (e.g., the channel condition indicates that the second antenna port can support a link on the primary carrier), the UE may determine that the secondary carrier is to be switched from the second antenna port to the first antenna port. Conversely, if the UE determines that the channel condition associated with the second antenna port does not satisfy the threshold (e.g., the channel condition indicates that the second antenna port cannot support a link on the primary carrier), the UE may determine not to switch the secondary carrier from the second antenna port to the first antenna port.

[0119] In some aspects, the UE may further determine whether to switch the secondary carrier from the second antenna port to the first antenna port based on a UE benefit associated with switching the secondary carrier from the second antenna port to the first antenna port. That is, in some aspects, the UE may determine whether to switch the secondary carrier from the second antenna port to the first antenna port based on whether switching the secondary carrier from the second antenna port to the first antenna port provides a benefit to the UE. The UE benefit may be associated with, for example, increased transmit power, increased throughput, improved call sustainability, etc.

[0120] In some aspects, the UE can determine the extent to which the UE benefits (e.g., increased transmit power, increased throughput, improved call sustainability, etc.) based on parameters of the second antenna port (e.g., MTPL, power headroom, etc.), parameters of the first antenna port, channel conditions associated with the second antenna port, and / or channel conditions associated with the first antenna port.

[0121] For example, the UE may determine an increase in transmit power associated with the secondary carrier based on the MTPL associated with the second antenna port and the MTPL associated with the first antenna port. Here, if the UE determines that the degree of benefit to the UE (i.e., the increase in transmit power) satisfies a transmit power increase threshold (e.g., a threshold indicating a minimum increase in MTPL required to allow the secondary carrier to be switched from the second antenna port to the first antenna port), the UE may determine that the secondary carrier will be switched from the second antenna port to the first antenna port. Conversely, if the UE determines that the degree of benefit to the UE does not satisfy the transmit power increase threshold, the UE may determine that the secondary carrier will not be switched from the second antenna port to the first antenna port.

[0122] As another example, the UE may determine a difference between a channel condition associated with a first antenna port and a channel condition associated with a second antenna port, and may deduce a degree of benefit to the UE (e.g., an improvement in the channel condition) based at least in part on the difference. Here, if the UE determines that the degree of benefit to the UE satisfies a channel condition improvement threshold (e.g., a threshold indicating a minimum improvement in the channel condition required to allow the secondary carrier to be switched from the second antenna port to the first antenna port), the UE may determine that the secondary carrier will be switched from the second antenna port to the first antenna port. Conversely, if the UE determines that the degree of benefit to the UE does not satisfy the channel condition improvement threshold, the UE may determine that the secondary carrier will not be switched from the second antenna port to the first antenna port.

[0123] In some aspects, the UE may further determine whether to switch the secondary carrier from the second antenna port to the first antenna port based at least in part on information associated with resource allocations of the primary carrier and information associated with resource allocations of the secondary carrier. That is, in some aspects, the UE may determine whether to switch the secondary carrier from the second antenna port to the first antenna port based on information associated with data traffic on the primary carrier and the secondary carrier. The information associated with the data traffic may include, for example, information indicating the number or regularity of resource block (RB) allocations on the primary carrier and the secondary carrier (e.g., on the uplink and / or downlink).

[0124] As a specific example, the UE may identify the number of RB allocations on the secondary carrier within a specific time window. Here, if the UE determines that the number of RB allocations on the secondary carrier satisfies a threshold number of RB allocations for the secondary carrier (e.g., the number of RB allocations on the secondary carrier is greater than a specific number of RB allocations), the UE may determine that the secondary carrier will be switched from the second antenna port to the first antenna port. Conversely, if the UE determines that the number of RB allocations on the secondary carrier does not satisfy the threshold associated with the secondary carrier, the UE may determine that the secondary carrier will not be switched from the second antenna port to the first antenna port.

[0125] As another specific example, the UE may identify the number of RB allocations on the primary carrier in a specific time window. Here, if the UE determines that the number of RB allocations on the primary carrier meets a threshold number of RB allocations for the primary carrier (e.g., the number of RB allocations on the primary carrier is less than or equal to a specific number of RB allocations), the UE may determine that the secondary carrier will be switched from the second antenna port to the first antenna port. Conversely, if the UE determines that the number of RB allocations on the primary carrier does not meet the threshold associated with the primary carrier, the UE may determine that the secondary carrier will not be switched from the second antenna port to the first antenna port.

[0126] As another specific example, the UE may identify the number of RB allocations on the primary carrier within a specific time window, and may identify the number of RB allocations on the secondary carrier within the specific time window. Here, if the UE determines that the number of RB allocations on the secondary carrier is greater than the number of RB allocations on the primary carrier (e.g., exceeds a specific number of RB allocations), the UE may determine that the secondary carrier will be switched from the second antenna port to the first antenna port. Conversely, if the UE determines that the number of RB allocations on the secondary carrier is not greater than the number of RB allocations on the primary carrier, the UE may determine that the secondary carrier will not be switched from the second antenna port to the first antenna port.

[0127] In example 300, the UE determines that the secondary carrier will be switched from the second antenna port to the first antenna port. Figure 3B As shown in the figure numeral 308, the UE may switch the secondary carrier from the second antenna port to the first antenna port based on the determination to switch the secondary carrier from the second antenna port to the first antenna port. In some aspects, the UE switches the primary carrier from the first antenna port to the second antenna port based on the determination to switch the secondary carrier from the second antenna port to the first antenna port. For example, Figure 3B As shown, the UE switches the secondary carrier from port B to port A, and switches the primary carrier from port A to port B.

[0128] As shown by reference numeral 310, after the secondary carrier is switched from the second antenna port to the first antenna port, the UE can communicate on the secondary carrier using the first antenna port (e.g., communicating with the second base station). Similarly, as shown by reference numeral 312, after the primary carrier is switched from the first antenna port to the second antenna port, the UE can communicate on the primary carrier using the second antenna port (e.g., communicating with the first base station).

[0129] In this way, the secondary carrier can be allowed to use the best available antenna (in example 300, this is the first transmit antenna associated with port A), thereby allowing the secondary carrier to be assigned to an antenna port that allows transmission at a higher transmit power while avoiding performance impact on the primary carrier. As a result, when the UE operates in a dual-carrier mode (e.g., NSA mode such as ENDC, DSDA mode, and / or the like), the overall performance associated with the UE, the achievable throughput, and the call sustainability of the UE can be improved.

[0130] In some aspects, after switching the secondary carrier from the second antenna port to the first antenna port, the UE may determine whether to switch (or return) the secondary carrier from the first antenna port to the second antenna port. In some aspects, the UE may determine whether to switch the secondary carrier from the first antenna port back to the second antenna port based on another channel condition associated with the second antenna port. For example, after the UE switches the secondary carrier from the second antenna port to the first antenna port, the UE may determine whether to switch the secondary carrier from the first antenna port back to the second antenna port based on the channel condition associated with the second antenna port observed by the UE.

[0131] In some aspects, the determination of whether to switch the secondary carrier back to the second antenna port is based at least in part on a determination of whether the primary carrier can continue to maintain a link on the second antenna port. Thus, in some aspects, the determination of whether to switch back to the secondary carrier is based at least in part on whether another channel condition on the second antenna port indicates that the second antenna port will continue to provide sufficient support for communications on the primary carrier. In some aspects, as described above, the other channel condition associated with the second antenna port can be based on one or more metrics associated with the second antenna port. In some aspects, as described above, the UE can determine whether to switch the secondary carrier from the first antenna port back to the second antenna port by determining whether the other channel condition associated with the second antenna port meets a threshold for communicating on the primary carrier. In some aspects, based on the determination to switch the secondary carrier from the first antenna port back to the second antenna port, the UE can switch the secondary carrier from the first antenna port to the second antenna port and can switch the primary carrier from the second antenna port to the first antenna port.

[0132] In some aspects, the determination of whether to switch the secondary carrier from the first antenna port to the second antenna port is triggered based on the expiration of a timer. For example, the UE may start a timer (e.g., a 100 millisecond timer) when switching the secondary carrier from the second antenna port to the first antenna port, and upon expiration of the timer, may determine whether to switch the secondary carrier from the first antenna port back to the second antenna port. Here, if the UE determines that the UE does not switch the secondary carrier from the first antenna port to the second antenna port, the UE may restart the timer. In this manner, the UE may be configured to periodically re-evaluate switching of the secondary carrier from the second antenna port to the first antenna port.

[0133] In some aspects, the determination of whether to switch the secondary carrier from the first antenna port to the second antenna port is triggered based on the detection of an event. For example, the UE may detect the event and, upon detecting the event, may determine whether to switch the secondary carrier from the first antenna port to the second antenna port. The event may include, for example, the UE moving from a cell in which the primary carrier is associated with a first RAT (e.g., LTE) to a cell in which the primary carrier is associated with a second RAT (e.g., NR), a change in the UE's operating mode (e.g., from ENDC to standalone mode on NR), a primary carrier handover to another cell, or another type of event.

[0134] As mentioned above, Figure 3A and 3B are provided as examples. Other examples may differ from those regarding Figure 3A and 3B described.

[0135] Figure 4 is a diagram illustrating an example process 400, for example, performed by a user UE, in accordance with various aspects of the present disclosure. Example process 400 is an example of a UE (eg, UE 120) performing operations associated with uplink performance optimization in dual carrier operation.

[0136] like Figure 4 As shown, in some aspects, process 400 may include communicating on a primary carrier using a first antenna port (block 410). For example, as described above, the UE (e.g., using antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, and / or memory 282) may communicate on a primary carrier using the first antenna port. In some aspects, the operations of block 410 may be performed by Figure 5 The communication component 508 is executed.

[0137] like Figure 4 As further shown in FIG. 4 , in some aspects, process 400 may include communicating on a secondary carrier using a second antenna port (block 420). For example, as described above, the UE (e.g., using antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, and / or memory 282) may communicate on a secondary carrier using the second antenna port. In some aspects, the operations of block 420 may be performed by Figure 5 The communication component 508 is executed.

[0138] like Figure 4As further shown in FIG. 4 , in some aspects, process 400 may include determining whether to switch the secondary carrier from the second antenna port to the first antenna port based on a channel condition associated with the second antenna port (block 430). For example, as described above, the UE (e.g., using antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, and / or memory 282) may determine whether to switch the secondary carrier from the second antenna port to the first antenna port based on a channel condition associated with the second antenna port. In some aspects, the operations of block 430 may be performed by Figure 5 The determination component 510 is executed.

[0139] like Figure 4 As further shown in FIG. 4 , in some aspects, process 400 may include switching the secondary carrier from the second antenna port to the first antenna port based on the determination to switch the secondary carrier from the second antenna port to the first antenna port (block 440). For example, as described above, the UE (e.g., using antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, and / or memory 282) may switch the secondary carrier from the second antenna port to the first antenna port based on the determination to switch the secondary carrier from the second antenna port to the first antenna port. In some aspects, the operations of block 440 may be performed by Figure 5 The switching component 512 is executed.

[0140] Process 400 may include additional aspects, such as any single aspect or any combination of aspects described below, and / or in conjunction with one or more other processes described elsewhere herein.

[0141] In a first aspect, process 400 includes switching a primary carrier from a first antenna port to a second antenna port based on a determination to switch a secondary carrier from the second antenna port to the first antenna port.

[0142] In a second aspect, alone or in combination with the first aspect, determining whether to switch the secondary carrier from the second antenna port to the first antenna port includes determining that a channel condition associated with the second antenna port meets a threshold for communicating using the primary carrier, and determining whether to switch the secondary carrier from the second antenna port to the first antenna port based on determining that the channel condition associated with the second antenna port meets the threshold for communicating using the primary carrier.

[0143] In a third aspect, alone or in combination with one or more of the first and second aspects, the threshold is associated with at least one of a block error rate associated with the second antenna port, a received signal strength indicator associated with the second antenna port, or a signal-to-noise ratio associated with the second antenna port.

[0144] In a fourth aspect, alone or in combination with one or more of the first to third aspects, determining whether to switch the secondary carrier from the second antenna port to the first antenna port is further based on UE benefit associated with switching the secondary carrier from the second antenna port to the first antenna port.

[0145] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the UE benefit is associated with at least one of improving transmit power, increasing throughput, or improving call sustainability.

[0146] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, determining whether to switch the secondary carrier from the second antenna port to the first antenna port is further based on information associated with resource allocation of the primary carrier and information associated with resource allocation of the secondary carrier.

[0147] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, process 400 includes, after switching the secondary carrier from the second antenna port to the first antenna port, determining whether to switch the secondary carrier from the first antenna port to the second antenna port based on another channel condition associated with the second antenna port, and switching the secondary carrier from the first antenna port to the second antenna port based on the determination to switch the secondary carrier from the first antenna port to the first antenna port.

[0148] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, process 400 includes switching a primary carrier from the second antenna port to the first antenna port based on a determination to switch a secondary carrier from the first antenna port to the second antenna port.

[0149] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, determining whether to switch the secondary carrier from the first antenna port to the second antenna port based on another channel condition includes determining that another channel condition associated with the second antenna port cannot meet a threshold for communicating using the primary carrier, and determining to switch the secondary carrier from the first antenna port to the second antenna port based on determining that another channel condition associated with the second antenna port cannot meet the threshold for communicating using the primary carrier.

[0150] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the determination of whether to switch the secondary carrier from the first antenna port to the second antenna port is triggered based on expiration of a timer.

[0151] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the determination of whether to switch the secondary carrier from the first antenna port to the second antenna port is triggered based on detection of an event.

[0152] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the UE operates in DC mode, the primary carrier is an anchor carrier associated with the DC mode, and the secondary carrier is a non-anchor carrier associated with the DC mode.

[0153] In the thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the primary carrier is an LTE carrier and the secondary carrier is an NR carrier.

[0154] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, the UE operates in dual SIM dual active mode, the primary carrier is associated with the first SIM, and the secondary carrier is associated with the second SIM.

[0155] although Figure 4 Example blocks of process 400 are shown, but in some aspects, process 400 may include more Figure 4 The blocks of process 400 may be more blocks, fewer blocks, different blocks, or blocks arranged differently than those depicted in FIG. Additionally or alternatively, two or more blocks of process 400 may be executed in parallel.

[0156] Figure 5 5 is a block diagram of an example apparatus 500 for wireless communication. Apparatus 500 may be a UE (e.g., UE 120), or a UE may include apparatus 500. In some aspects, apparatus 500 includes a receiving component 502 and a transmitting component 504, which may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 500 may communicate with another apparatus 506 (such as a UE, a base station, or another wireless communication device) using receiving component 502 and transmitting component 504. As further shown, apparatus 500 may include one or more of a communication component 508, a determination component 510, or a switching component 512, among other examples.

[0157] In some aspects, apparatus 500 may be configured to perform a combination of Figures 3A-3B Additionally or alternatively, the apparatus 500 may be configured to perform one or more processes described herein, such as Figure 4 The process 400. In some aspects, Figure 5 The apparatus 500 and / or one or more components shown in FIG. 5 may include the above combined Figure 2 Additionally or alternatively, Figure 5 One or more of the components shown in the above may be combined Figure 2 Additionally or alternatively, one or more components in the component set may be at least partially implemented as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0158] The receiving component 502 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 506. The receiving component 502 may provide the received communications to one or more other components of the apparatus 500. In some aspects, the receiving component 502 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding) on ​​the received communications and may provide the processed signals to one or more other components of the apparatus 506. In some aspects, the receiving component 502 may include the above-described components in combination with the receiving component 502. Figure 2 One or more antennas, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof of a described UE.

[0159] The transmitting component 504 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 506. In some aspects, one or more other components of the apparatus 506 may generate communications and may provide the generated communications to the transmitting component 504 for transmission to the apparatus 506. In some aspects, the transmitting component 504 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding) on ​​the generated communications and may transmit the processed signals to the apparatus 506. In some aspects, the transmitting component 504 may include the above-described components in combination with the above-described components. Figure 2 One or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the described UE. In some aspects, the transmit component 504 can be co-located with the receive component 502 in a transceiver.

[0160] Communication component 508 can communicate on a primary carrier using the first antenna port. Communication component 508 can communicate on a secondary carrier using the second antenna port.

[0161] The determining component 510 may determine whether to switch the secondary carrier from the second antenna port to the first antenna port based on a channel condition associated with the second antenna port. The determining component 510 may determine that the channel condition associated with the second antenna port meets a threshold for communicating using the primary carrier, and based on determining that the channel condition associated with the second antenna port meets the threshold for communicating using the primary carrier, determine whether to switch the secondary carrier from the second antenna port to the first antenna port. After switching the secondary carrier from the second antenna port to the first antenna port, the determining component 510 may determine whether to switch the secondary carrier from the first antenna port to the second antenna port based on another channel condition associated with the second antenna port. The determining component 510 may determine that other channel conditions associated with the second antenna port do not meet the threshold for communicating using the primary carrier, and based on determining that the other channel conditions associated with the second antenna port do not meet the threshold for communicating using the primary carrier, determine to switch the secondary carrier from the first antenna port to the second antenna port.

[0162] The switching component 512 may switch the secondary carrier from the second antenna port to the first antenna port based on the determination to switch the secondary carrier from the second antenna port to the first antenna port. The switching component 512 may switch the primary carrier from the first antenna port to the second antenna port based on the determination to switch the secondary carrier from the second antenna port to the first antenna port. The switching component 512 may switch the secondary carrier from the first antenna port to the second antenna port based on the determination to switch the secondary carrier from the first antenna port to the first antenna port. The switching component 512 may switch the primary carrier from the second antenna port to the first antenna port based on the determination to switch the secondary carrier from the first antenna port to the second antenna port.

[0163] Figure 5 The number and arrangement of components shown in are provided as examples. Figure 5 There may be additional components, fewer components, different components, or components arranged differently than those shown in FIG. Figure 5 Two or more components shown may be implemented in a single component, or Figure 5 The single component shown may be implemented as multiple distributed components. Additionally or alternatively, Figure 5 The shown collection of component(s) may perform the operations described as being performed by Figure 5 Another set of components is shown to perform one or more functions.

[0164] Figure 66 is a block diagram of an example apparatus 600 for wireless communication. Apparatus 600 may be a base station (e.g., base station 110), or a base station may include apparatus 600. In some aspects, apparatus 600 includes a receiving component 602 and a transmitting component 604, which may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 600 may communicate with another apparatus 606 (such as a UE, a base station, or another wireless communication device) using receiving component 602 and transmitting component 604.

[0165] In some aspects, the apparatus 600 may be configured to perform Figure 3A and 3B Additionally or alternatively, the apparatus 600 may be configured to perform one or more of the processes described herein. In some aspects, Figure 6 The apparatus 600 and / or one or more components shown in FIG. 6 may include the above combined Figure 2 Additionally or alternatively, Figure 6 One or more of the components shown in the above may be combined Figure 2 Additionally or alternatively, one or more components of the component set may be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0166] The receiving component 602 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 606. The receiving component 602 may provide the received communications to one or more other components of the apparatus 600. In some aspects, the receiving component 602 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding) on ​​the received communications and may provide the processed signals to one or more other components of the apparatus 606. In some aspects, the receiving component 602 may include the above-described components in combination with the receiving component 602. Figure 2 One or more antennas, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof of a base station are described.

[0167] The transmitting component 604 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 606. In some aspects, one or more other components of the apparatus 606 may generate communications and may provide the generated communications to the transmitting component 604 for transmission to the apparatus 606. In some aspects, the transmitting component 604 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding) on ​​the generated communications and may transmit the processed signals to the apparatus 606. In some aspects, the transmitting component 604 may include the above-described components in combination with the above-described components. Figure 2 One or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the described base stations. In some aspects, the transmit component 604 can be co-located with the receive component 602 in a transceiver.

[0168] Figure 6 The number and arrangement of components shown in are provided as examples. Figure 6 There may be additional components, fewer components, different components, or components arranged differently than those shown in FIG. Figure 6 Two or more components shown in may be implemented within a single component, or Figure 6 A single component shown in may be implemented as multiple distributed components. Additionally or alternatively, Figure 6 The assembly of (one or more) components shown in the FIGURES may perform the operations described by Figure 6 One or more functions performed by another set of components shown in .

[0169] The following provides an overview of some aspects of the disclosure:

[0170] Aspect 1: A wireless communication method performed by a user equipment (UE), comprising: communicating on a primary carrier using a first antenna port; communicating on a secondary carrier using a second antenna port; determining whether to switch the secondary carrier from the second antenna port to the first antenna port based on a channel condition associated with the second antenna port; and switching the secondary carrier from the second antenna port to the first antenna port based on the determination to switch the secondary carrier from the second antenna port to the first antenna port.

[0171] Aspect 2: The method according to aspect 1, further comprising: switching the primary carrier from the first antenna port to the second antenna port based on the determination to switch the secondary carrier from the second antenna port to the first antenna port.

[0172] Aspect 3: A method according to any one of Aspects 1-2, wherein determining whether to switch the secondary carrier from the second antenna port to the first antenna port includes: determining that a channel condition associated with the second antenna port meets a threshold for using the primary carrier for communication, and determining whether to switch the secondary carrier from the second antenna port to the first antenna port based on determining that the channel condition associated with the second antenna port meets the threshold for using the primary carrier for communication.

[0173] Aspect 4: The method according to aspect 3, wherein the threshold is associated with at least one of the following: a block error rate associated with the second antenna port, a received signal strength indicator associated with the second antenna port, or a signal-to-noise ratio associated with the second antenna port.

[0174] Aspect 5: The method according to any one of aspects 1-4, wherein determining whether to switch the secondary carrier from the second antenna port to the first antenna port is further based on UE revenue associated with switching the secondary carrier from the second antenna port to the first antenna port.

[0175] Aspect 6: The method according to aspect 5, wherein the UE benefit is associated with at least one of improving transmit power, increasing throughput, or improving call sustainability.

[0176] Aspect 7: The method according to any one of aspects 1-6, wherein determining whether to switch the secondary carrier from the second antenna port to the first antenna port is further based on information associated with resource allocation of the primary carrier and information associated with resource allocation of the secondary carrier.

[0177] Aspect 8: The method according to any one of Aspects 1-7 further includes: after switching the auxiliary carrier from the second antenna port to the first antenna port, determining whether to switch the auxiliary carrier from the first antenna port to the second antenna port based on another channel condition associated with the second antenna port, and switching the auxiliary carrier from the first antenna port to the second antenna port based on the determination to switch the auxiliary carrier from the first antenna port to the first antenna port.

[0178] Aspect 9: The method according to aspect 8, further comprising: based on the determination to switch the secondary carrier from the first antenna port to the second antenna port, switching the primary carrier from the second antenna port to the first antenna port.

[0179] Aspect 10: A method according to any one of Aspects 8-9, wherein determining whether to switch the secondary carrier from the first antenna port to the second antenna port based on another channel condition includes: determining that another channel condition associated with the second antenna port cannot meet a threshold for using the primary carrier for communication, and determining to switch the secondary carrier from the first antenna port to the second antenna port based on determining that another channel condition associated with the second antenna port cannot meet the threshold for using the primary carrier for communication.

[0180] Aspect 11: The method according to any one of aspects 8-10, wherein the determination of whether to switch the secondary carrier from the first antenna port to the second antenna port is triggered based on expiration of a timer.

[0181] Aspect 12: The method according to any one of aspects 8-11, wherein the determination of whether to switch the secondary carrier from the first antenna port to the second antenna port is triggered based on the detection of an event.

[0182] Aspect 13: The method according to any one of aspects 1-12, wherein the UE operates in dual connectivity (DC) mode, the primary carrier is an anchor carrier associated with the DC mode, and the secondary carrier is a non-anchor carrier associated with the DC mode.

[0183] Aspect 14: The method according to any one of aspects 1-13, wherein the primary carrier is a Long Term Evolution (LTE) carrier and the secondary carrier is a New Radio (NR) carrier.

[0184] Aspect 15: The method according to any one of aspects 1-14, wherein the UE operates in a dual subscriber identity module (SIM) dual active mode, a primary carrier is associated with a first SIM, and a secondary carrier is associated with a second SIM.

[0185] Aspect 16: An apparatus for wireless communication at a device, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of one or more aspects of aspects 1-15.

[0186] Aspect 17: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors configured to perform the method of one or more aspects of aspects 1-15.

[0187] Aspect 18: An apparatus for wireless communication, comprising at least one component for performing the method of one or more aspects of aspects 1-15.

[0188] Aspect 19: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more aspects of aspects 1-15.

[0189] Aspect 20: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform one or more methods of aspects 1-15.

[0190] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit these aspects to the precise form disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of these aspects.

[0191] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, and / or a combination of hardware and software. It will be apparent that the systems and / or methods described herein may be implemented using various forms of hardware, firmware, and / or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit these aspects. Therefore, the operation and behavior of the systems and / or methods are described herein without reference to specific software code, and it should be understood that software and hardware may be designed to implement the systems and / or methods based, at least in part, on the description herein.

[0192] As used herein, satisfying a threshold may refer to a value that is greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0193] Even though particular combinations of features are recited in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of the various aspects. In fact, many of these features may be combined in ways not specifically recited in the claims and / or disclosed in the specification. Although each dependent claim listed below may be directly dependent on only one claim, the disclosure of the various aspects includes the combination of each dependent claim with every other claim in the claim set. A phrase referring to "at least one of" in a list of items refers to any combination of those items, including single members. For example, "at least one of a, b, or c" is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination of multiple of the same elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc or any other order of a, b, and c.

[0194] Unless explicitly described, any element, action or instruction used herein should not be interpreted as key or necessary. In addition, as used herein, the articles "one" and "an" are intended to include one or more projects and can be used interchangeably with "one or more". In addition, as used herein, the article "the" is intended to include one or more projects related to the article "the" and can be used interchangeably with "the one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more projects (e.g., related projects, unrelated projects, combinations of related and unrelated projects, etc.), and can be used interchangeably with "one or more". If only one project is referred to, phrases "only one" or similar language are used. In addition, as used herein, the terms "have", "have" and / or similar terms are intended to be open terms. In addition, the phrase "based on ......" is intended to represent "at least partially based on ......", unless otherwise explicitly stated. In addition, as used herein, the term "or" is inclusive when used in a series and can be used interchangeably with "and / or", unless otherwise explicitly stated (e.g., if used in combination with "either" or "only one").

Claims

1. A method of wireless communication performed by a user equipment (UE) operating in a dual connectivity (DC) mode, comprising: communicating on an anchor carrier using a first antenna port of the UE; communicating on a non-anchor carrier using a second antenna port of the UE; determining to switch the non-anchor carrier from the second antenna port to the first antenna port based on a channel condition associated with the second antenna port and based on one or more of a first power limit associated with the first antenna port or a second power limit associated with the second antenna port, wherein the first power limit associated with the first antenna port is different from the second power limit associated with the second antenna port; as well as The non-anchor carrier is switched from the second antenna port to the first antenna port based on the determination, and the non-anchor carrier is switched from the second antenna port to the first antenna port.

2. The method according to claim 1, further comprising: Based on determining to switch the non-anchor carrier from the second antenna port to the first antenna port, the anchor carrier is switched from the first antenna port to the second antenna port.

3. The method according to claim 1, wherein Determining to switch the non-anchor carrier from the second antenna port to the first antenna port includes: determining that the channel condition associated with the second antenna port satisfies a threshold for communicating using the anchor carrier, and Based on determining that the channel condition associated with the second antenna port satisfies the threshold for communicating using the anchor carrier, determining to switch the non-anchor carrier from the second antenna port to the first antenna port.

4. The method according to claim 3, wherein: The threshold is associated with at least one of the following: a block error rate associated with the second antenna port, a received signal strength indicator associated with the second antenna port, or a signal-to-noise ratio associated with the second antenna port.

5. The method according to claim 1, wherein Determining to switch the non-anchor carrier from the second antenna port to the first antenna port is further based on a UE benefit associated with switching the non-anchor carrier from the second antenna port to the first antenna port.

6. The method according to claim 5, wherein: The UE benefit is associated with at least one of improving transmit power, increasing throughput, or improving call sustainability.

7. The method according to claim 1, wherein Determining to switch the non-anchor carrier from the second antenna port to the first antenna port is further based on information associated with resource allocations of the anchor carrier and information associated with resource allocations of the non-anchor carrier.

8. The method according to claim 1, further comprising: After switching the non-anchor carrier from the second antenna port to the first antenna port, determining to switch the non-anchor carrier from the first antenna port to the second antenna port based on another channel condition associated with the second antenna port, and Based on determining to switch the non-anchor carrier from the first antenna port to the first antenna port, the non-anchor carrier is switched from the first antenna port to the second antenna port.

9. The method according to claim 8, further comprising: Based on determining to switch the non-anchor carrier from the first antenna port to the second antenna port, the anchor carrier is switched from the second antenna port to the first antenna port.

10. The method according to claim 8, wherein Determining, based on the other channel condition, to switch the non-anchor carrier from the first antenna port to the second antenna port comprises: determining that the another channel condition associated with the second antenna port fails to meet a threshold for communicating using the anchor carrier, and Based on a determination that the another channel condition associated with the second antenna port fails to satisfy the threshold for communicating using the anchor carrier, a determination is made to switch the non-anchor carrier from the first antenna port to the second antenna port.

11. The method according to claim 8, wherein Determining to switch the non-anchor carrier from the first antenna port to the second antenna port is triggered based on expiration of a timer.

12. The method according to claim 8, wherein Determining to switch the non-anchor carrier from the first antenna port to the second antenna port is triggered based on detection of an event.

13. The method according to claim 1, wherein The anchor carrier is a Long Term Evolution (LTE) carrier and the non-anchor carrier is a New Radio (NR) carrier.

14. The method according to claim 1, wherein The UE operates in a dual subscriber identity module (SIM) dual active mode, the anchor carrier is associated with a first SIM, and the non-anchor carrier is associated with a second SIM.

15. A computer program product comprising computer-readable instructions which, when executed by one or more processors of a user equipment, cause the one or more processors to perform the method of wireless communication according to any one of claims 1 to 14.

16. A user equipment (UE) for wireless communication, comprising: at least one memory comprising instructions; and one or more processors configured to execute the instructions to cause the UE to: communicating on an anchor carrier using a first antenna port of the UE; communicating on a non-anchor carrier using a second antenna port of the UE; determining to switch the non-anchor carrier from the second antenna port to the first antenna port based on a channel condition associated with the second antenna port and based on one or more of a first power limit associated with the first antenna port or a second power limit associated with the second antenna port, wherein the first power limit associated with the first antenna port is different from the second power limit associated with the second antenna port; as well as The non-anchor carrier is switched from the second antenna port to the first antenna port based on the determination, and the non-anchor carrier is switched from the second antenna port to the first antenna port.

17. The UE according to claim 16, wherein: The one or more processors are further configured to cause the UE to: Based on determining to switch the non-anchor carrier from the second antenna port to the first antenna port, the anchor carrier is switched from the first antenna port to the second antenna port.

18. The UE according to claim 16, wherein: To determine to switch the non-anchor carrier from the second antenna port to the first antenna port, the one or more processors are further configured to cause the UE to: determining that the channel condition associated with the second antenna port satisfies a threshold for communicating using the anchor carrier, and Based on determining that the channel condition associated with the second antenna port satisfies the threshold for communicating using the anchor carrier, determining to switch the non-anchor carrier from the second antenna port to the first antenna port.

19. The UE according to claim 16, wherein: Determining to switch the non-anchor carrier from the second antenna port to the first antenna port is further based on at least one of the following: a UE benefit associated with switching the non-anchor carrier from the second antenna port to the first antenna port, or Information associated with resource allocation for the anchor carrier and information associated with resource allocation for the non-anchor carrier.

20. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising: One or more instructions, when the one or more instructions are executed by one or more processors of a user equipment (UE), cause the one or more processors to: communicating on an anchor carrier using a first antenna port of the UE; communicating on a non-anchor carrier using a second antenna port of the UE; determining to switch the non-anchor carrier from the second antenna port to the first antenna port based on a channel condition associated with the second antenna port and based on one or more of a first power limit associated with the first antenna port or a second power limit associated with the second antenna port, wherein the first power limit associated with the first antenna port is different from the second power limit associated with the second antenna port; as well as The non-anchor carrier is switched from the second antenna port to the first antenna port based on the determination, and the non-anchor carrier is switched from the second antenna port to the first antenna port.

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