Antenna selection in idle mode

Abstract

A method and apparatus for antenna selection in idle mode. The apparatus measures a channel condition for each of a plurality of antennas at the UE. While in the RRC idle mode, the apparatus dynamically selects at least one antenna from the plurality of antennas based on the channel condition. The apparatus may terminate the measurement of the channel condition for each antenna of the plurality of antennas in response to the channel condition on two active antennas being greater than a first threshold T0 and a PDSCH result including a CRC pass rate of 100%. The apparatus may trigger measurements across the plurality of antennas in response to the channel condition across the first pair of active antennas being less than a second threshold (T1). The apparatus may determine whether a second antenna pair has a channel condition greater than the second threshold.

Description

Technical Field

[0001] The present disclosure relates generally to communication systems, and more particularly to configurations for antenna selection in idle mode. Background Art

[0002] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcast. Typical wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources. 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, and time division synchronous code division multiple access (TD-SCDMA) systems.

[0003] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, region, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of the continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the Internet of Things (IoT)) and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable low latency communication (URLLC). Certain aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. Further improvements to 5G NR technology are needed. These improvements may also be applicable to other multiple access technologies and telecommunication standards that employ these technologies. Summary of the invention

[0004] A simplified overview of one or more aspects is presented below to provide a basic understanding of these aspects. This summary is not an extensive review of all contemplated aspects. This summary neither identifies the key or important elements of all aspects, nor describes the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to a more detailed description presented later.

[0005] In one aspect of the present disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a device at a UE. The apparatus may be a processor and / or a modem at the UE or the UE itself. The apparatus measures a channel condition for each of a plurality of antennas at the UE. When in a radio resource control (RRC) idle mode, the apparatus dynamically selects at least one antenna from the plurality of antennas based on the channel condition.

[0006] In one aspect of the present disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a device at a UE. The apparatus may be a processor and / or a modem at the UE or the UE itself. The apparatus measures channel conditions of a first antenna set and a second antenna set at the UE. When in a radio resource control (RRC) idle mode, the apparatus dynamically selects at least one antenna from the first antenna set or the second antenna set based on the channel conditions.

[0007] To achieve the aforementioned and related purposes, one or more aspects include the features fully described below and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail some exemplary features of one or more aspects. However, these features indicate only some of the various ways in which the principles of the various aspects can be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a diagram illustrating an example of a wireless communication system and an access network.

[0009] Figure 2A is a diagram illustrating an example of a first frame according to various aspects of the present disclosure.

[0010] Figure 2B is a diagram illustrating an example of downlink (DL) channels within a subframe according to various aspects of the present disclosure.

[0011] Figure 2C is a diagram illustrating an example of a second frame according to various aspects of the present disclosure.

[0012] Figure 2D is a diagram illustrating an example of uplink (UL) channels within a subframe according to various aspects of the present disclosure.

[0013] Figure 3 is a diagram illustrating an example of a base station and a user equipment (UE) in an access network.

[0014] Figure 4 is an example diagram of dynamic antenna selection in RRC idle mode.

[0015] Figure 5 is an example diagram of dynamic antenna selection in RRC idle mode.

[0016] Figure 6 It is a call flow diagram of the signaling between the UE and the base station.

[0017] Figure 7 is a flow chart of a method of wireless communication.

[0018] Figure 8 is a flow chart of a method of wireless communication.

[0019] Fig. 9 are diagrams illustrating examples of hardware implementations for example apparatuses and / or network entities.

[0020] Fig.10 is a call flow diagram of signaling between UE and base station.

[0021] Fig.11 is a flow chart of a method of wireless communication.

[0022] Fig.12 is a flow chart of a method of wireless communication.

[0023] Fig.13 are diagrams illustrating examples of hardware implementations for example apparatuses and / or network entities. DETAILED DESCRIPTION

[0024] In wireless communication, when the UE is in the CONNECT state with traffic, receive diversity and antenna switching diversity (AsDiv) algorithms may work when the UE hardware supports 4 antennas. However, when the UE is in RRC idle mode, the hardware may only support antenna diversity within a default pair, where the default pair may be Rx01. Idle antenna diversity may include two states: a first state 1Rx and a second state 2Rx. For the first state 1Rx, either Rx0 or Rx1 may be selected, while for the second state 2Rx, only Rx01 is available. For a UE in an idle state, the current antenna selection may be limited to the default Rx01 and may be used for idle activities such as SIB reading, receiving paging messages, neighbor cell measurements, etc. In some instances, Rx0 or Rx1 may not be the best performing antenna among all antennas available at the UE, so that another antenna may have a better signal or may perform better than Rx0 or Rx1.

[0025] Aspects of the present application provide a configuration for antenna selection in idle mode. The configuration may allow a UE to select an antenna based on at least a channel condition of each of a plurality of antennas at the UE when in RRC idle mode.

[0026] The specific embodiments described below in conjunction with the accompanying drawings are descriptions of various configurations and do not represent the only configurations in which the concepts described herein can be practiced. In order to provide a thorough understanding of the various concepts, the specific embodiments include specific details. However, these concepts can be practiced without these specific details. In some cases, well-known structures and components are shown in block diagram form to avoid blurring such concepts.

[0027] Several aspects of telecommunication systems are presented with reference to various apparatus and methods. These apparatus and methods are described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0028] As an example, an element, or any part of an element, or any combination of elements can be implemented as a "processing system", which includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on chip (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gating logic, discrete hardware circuits, and other suitable hardware configured to perform various functionalities described throughout the present disclosure. One or more processors in a processing system can execute software. Whether referred to as software, firmware, middleware, microcode, hardware description language, or other terms, software should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software components, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, or any combination thereof.

[0029] Thus, in one or more example aspects, specific implementations and / or use cases, the described functionality may be implemented in hardware, software, or any combination thereof. If implemented in software, the functionality may be stored or encoded as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media. Storage media may be any available media that can be accessed by a computer. As an example, such computer-readable media may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of these types of computer-readable media, or any other media that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.

[0030] Although various aspects, specific implementations and / or use cases are described in this application by the illustration of some examples, additional or different aspects, specific implementations and / or use cases may be generated in many different arrangements and scenarios. The various aspects, specific implementations and / or use cases described herein can be implemented across many different platform types, devices, systems, shapes, sizes and packaging arrangements. For example, various aspects, specific implementations and / or use cases can be generated via integrated chip specific implementations and other devices based on non-module components (e.g., end-user devices, vehicles, communication equipment, computing equipment, industrial equipment, retail / purchase equipment, medical equipment, artificial intelligence (AI) enabled devices, etc.). Although some examples may or may not be specifically for use cases or applications, the described examples may have a wide range of applicability. Various aspects, specific implementations and / or use cases may be in the range from chip-level or modular components to non-modular, non-chip-level specific implementations, and further to the range of aggregated, distributed or original equipment manufacturer (OEM) devices or systems in conjunction with one or more technologies herein. In some actual settings, the device combined with the various aspects and features described may also include additional components and features for implementing and practicing the claimed and described aspects. For example, the transmission and reception of wireless signals necessarily include multiple components for analog and digital purposes (e.g., hardware components including antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders / summers, etc.). The various techniques described herein can be practiced in a wide variety of devices of various sizes, shapes, and configurations, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc.

[0031] The deployment of a communication system (such as a 5G NR system) can be arranged with various components or constituent parts in a variety of ways. In a 5G NR system or network, a network node, a network entity, a mobility element of a network, a radio access network (RAN) node, a core network node, a network element or network equipment (such as a base station (BS)) or one or more units (or one or more components) that perform base station functionality can be implemented in an aggregated or decomposed architecture. For example, a BS (such as a Node B (NB), an evolved NB (eNB), an NR BS, a 5G NB, an access point (AP), a transmit receive point (TRP) or a cell, etc.) can be implemented as an aggregated base station (also referred to as an independent BS or a monolithic BS) or a decomposed base station.

[0032] A converged base station may be configured to utilize a radio protocol stack physically or logically integrated within a single RAN node. A decomposed base station may be configured to utilize a protocol stack physically or logically distributed between two or more units, such as one or more central or centralized units (CUs), one or more distributed units (DUs), or one or more radio units (RUs). In some aspects, a CU may be implemented within a RAN node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually distributed in one or more other RAN nodes. A DU may be implemented to communicate with one or more RUs. Each of a CU, a DU, and a RU may be implemented as a virtual unit, i.e., a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU).

[0033] Base station operations or network design may take into account the aggregated nature of base station functionality. For example, a disaggregated base station may be utilized in an integrated access backhaul (IAB) network, an open radio access network (O-RAN (network configuration such as that initiated by the O-RAN Alliance)), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN)). Decomposition may include distributing functionality across two or more units at various physical locations, as well as virtually distributing functionality of at least one unit, which may enable flexibility in network design. Various units of a disaggregated base station or disaggregated RAN architecture may be configured for wired or wireless communication with at least one other unit.

[0034] Figure 1 1 is a diagram 100 illustrating an example of a wireless communication system and an access network. The illustrated wireless communication system includes a disaggregated base station architecture. The disaggregated base station architecture may include one or more CUs 110 that may communicate directly with a core network 120 via a backhaul link, or indirectly with the core network 120 through one or more disaggregated base station units, such as a near real-time (near-RT) RAN intelligent controller (RIC) 125 via an E2 link or a non-real-time (non-RT) RIC 115 associated with a service management and orchestration (SMO) framework 105, or both. The CU 110 may communicate with one or more DUs 130 via corresponding midhaul links, such as an F1 interface. The DU 130 may communicate with one or more RUs 140 via corresponding fronthaul links. The RU 140 may communicate with corresponding UEs 104 via one or more radio frequency (RF) access links. In some implementations, a UE 104 may be served simultaneously by multiple RUs 140.

[0035] Each of these units (i.e., CU 110, DU 130, RU 140, and near-RT RIC 125, non-RT RIC 115, and SMO framework 105) may include or be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively referred to as signals) via a wired transmission medium or a wireless transmission medium. Each of these units or an associated processor or controller that provides instructions to the communication interface of these units may be configured to communicate with one or more of the other units via a transmission medium. For example, these units may include a wired interface configured to receive signals or transmit signals to one or more of the other units via a wired transmission medium. Additionally, these units may include a wireless interface that may include a receiver, transmitter, or transceiver (such as an RF transceiver) configured to receive and / or transmit signals to one or more of the other units via a wireless transmission medium.

[0036] In some aspects, CU 110 may host one or more higher layer control functions. Such control functions may include radio resource control (RRC), packet data convergence protocol (PDCP), or service data adaptation protocol (SDAP), etc. Each control function may be implemented using an interface that is configured to communicate signals with other control functions hosted by CU 110. CU 110 may be configured to handle user plane functionality (i.e., central unit-user plane (CU-UP)), control plane functionality (i.e., central unit-control plane (CU-CP)), or a combination thereof. In some specific implementations, CU 110 may be logically split into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, the CU-UP unit may communicate bidirectionally with the CU-CP unit via an interface (such as an E1 interface). As needed, CU 110 may be implemented to communicate with DU 130 for network control and signaling.

[0037] DU 130 may correspond to a logical unit that includes one or more base station functions for controlling the operation of one or more RUs 140. In some aspects, DU 130 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation or demodulation, etc.) at least in part according to a functional split such as those defined by 3GPP. In some aspects, DU 130 may also host one or more low PHY layers. Each layer (or module) may be implemented using an interface that is configured to communicate signals with other layers (and modules) hosted by DU 130 or with control functions hosted by CU 110.

[0038] The lower layer functionality may be implemented by one or more RUs 140. In some deployments, the RU 140 controlled by the DU 130 may correspond to a logical node that hosts RF processing functions or low PHY layer functions (such as performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, or physical random access channel (PRACH) extraction and filtering, etc.) or both, at least in part based on function splitting (such as lower layer function splitting). In such an architecture, the RU 140 may be implemented to handle over-the-air (OTA) communication with one or more UEs 104. In some embodiments, the real-time and non-real-time aspects of the control plane communication and user plane communication with the RU 140 may be controlled by the corresponding DU 130. In some scenarios, this configuration may enable the DU 130 and CU 110 to be implemented in a cloud-based RAN architecture (such as a vRAN architecture).

[0039] The SMO framework 105 may be configured to support the RAN deployment and orchestration of non-virtualized network elements and virtualized network elements. For non-virtualized network elements, the SMO framework 105 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements, and these dedicated physical resources may be managed via an operation and maintenance interface (such as the O1 interface). For virtualized network elements, the SMO framework 105 may be configured to interact with a cloud computing platform (such as the Open Cloud (O-Cloud) 190) to perform network element lifecycle management (such as instantiating virtualized network elements) via a cloud computing platform interface (such as the O2 interface). Such virtualized network elements may include, but are not limited to, the CU 110, DU 130, RU 140, and near RT RIC 125. In some embodiments, the SMO framework 105 may communicate with the hardware aspects of the 4G RAN (such as the Open eNB (O-eNB) 111) via the O1 interface. Additionally, in some embodiments, the SMO framework 105 may communicate directly with one or more RUs 140 via the O1 interface. The SMO framework 105 may also include a non-RT RIC 115 configured to support the functionality of the SMO framework 105.

[0040] The non-RT RIC 115 may be configured to include logic functions that enable non-real-time control and optimization of RAN elements and resources, artificial intelligence (AI) / machine learning (ML) (AI / ML) workflows including model training and updating, or policy-based guidance of applications / features in the near-RT RIC 125. The non-RT RIC 115 may be coupled to or in communication with the near-RT RIC 125 (such as via an A1 interface). The near-RT RIC 125 may be configured to include logic functions that enable near-real-time control and optimization of RAN elements and resources via data collection and actions through an interface (such as via an E2 interface) that connects one or more CUs 110, one or more DUs 130, or both, and O-eNBs with the near-RT RIC 125.

[0041] In some implementations, in order to generate an AI / ML model to be deployed in the near-RT RIC 125, the non-RT RIC 115 may receive parameters or external enrichment information from an external server. Such information may be utilized by the near-RT RIC 125 and may be received from a non-network data source or from a network function at the SMO framework 105 or the non-RT RIC 115. In some examples, the non-RT RIC 115 or the near-RT RIC 125 may be configured to tune RAN behavior or performance. For example, the non-RT RIC 115 may monitor long-term trends and patterns of performance and employ AI / ML models to perform corrective actions through the SMO framework 105 (such as via reconfiguration of O1) or via the creation of RAN management policies (such as A1 policies).

[0042] At least one of the CU 110, the DU 130, and the RU 140 may be referred to as a base station 102. Therefore, the base station 102 may include one or more of the CU 110, the DU 130, and the RU 140 (each component is indicated by a dotted line to indicate that each component may be included in the base station 102 or may not be included in the base station). The base station 102 provides an access point to the core network 120 for the UE 104. The base station 102 may include a macro cell (a high-power cellular base station) and / or a small cell (a low-power cellular base station). Small cells include femto cells, pico cells, and micro cells. A network including both small cells and macro cells may be referred to as a heterogeneous network. A heterogeneous network may also include a home evolved Node B (eNB) (HeNB), which may provide services to a restricted group referred to as a closed subscriber group (CSG). The communication link between RU 140 and UE 104 may include uplink (UL) (also known as reverse link) transmission from UE 104 to RU 140 and / or downlink (DL) (also known as forward link) transmission from RU 140 to UE 104. The communication link may use multiple-input multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming and / or transmit diversity. The communication link may pass through one or more carriers. For each carrier allocated in a carrier aggregation of up to Yx MHz (x component carriers) for transmission in each direction, the base station 102 / UE 104 may use a spectrum of up to Y MHz (e.g., 5MHz, 10MHz, 15MHz, 20MHz, 100MHz, 400MHz, etc.) bandwidth. These carriers may or may not be adjacent to each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated to DL compared to UL). Component carriers may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell) and the secondary component carrier may be referred to as a secondary cell (SCell).

[0043] Some UEs 104 may communicate with each other using a device-to-device (D2D) communication link 158. The D2D communication link 158 may use DL / UL wireless wide area network (WWAN) spectrum. The D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). The D2D communication may be through a variety of wireless D2D communication systems, such as, for example, Bluetooth, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

[0044] The wireless communication system may also include a Wi-Fi AP 150 that communicates with a UE 104 (also referred to as a Wi-Fi station (STA)) via a communication link 154, for example, in a 5 GHz unlicensed spectrum, etc. When communicating in an unlicensed spectrum, the UE 104 / AP 150 may perform a clear channel assessment (CCA) to determine whether a channel is available prior to communication.

[0045] The electromagnetic spectrum is typically subdivided into various categories, bands, channels, etc. based on frequency / wavelength. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6 GHz). Although a portion of FR1 is greater than 6 GHz, FR1 is often (interchangeably) referred to as the "sub-6 GHz" band in various documents and articles. A similar naming issue sometimes occurs with respect to FR2, which is often (interchangeably) referred to as the "millimeter wave" band in documents and articles, although different from the extremely high frequency (EHF) band (30 GHz-300 GHz) identified as the "millimeter wave" band by the International Telecommunication Union (ITU).

[0046] Frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Recent 5G NR research has identified the operating bands for these mid-band frequencies as frequency range designation FR3 (7.125GHz-24.25GHz). The bands falling within FR3 can inherit FR1 characteristics and / or FR2 characteristics, so the features of FR1 and / or FR2 can be effectively extended to mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operations to more than 52.6GHz. For example, three higher operating bands have been identified as frequency range designations FR2-2 (52.6GHz-71GHz), FR4 (71GHz-114.25GHz) and FR5 (114.25GHz-300GHz). Each of these higher frequency bands falls within the EHF band.

[0047] In view of the above, unless otherwise specified, if the term "sub-6 GHz" or the like is used in this document, it may broadly refer to frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies. In addition, unless otherwise specified, if the term "millimeter wave" or the like is used in this document, it may broadly refer to frequencies that may include mid-band frequencies, may be within FR2, FR4, FR2-2, and / or FR5, or may be within the EHF band.

[0048] The base station 102 and the UE 104 may each include multiple antennas (such as antenna elements, antenna panels, and / or antenna arrays) to facilitate beamforming. The base station 102 may send a beamformed signal 182 to the UE 104 in one or more transmit directions. The UE 104 may receive the beamformed signal from the base station 102 in one or more receive directions. The UE 104 may also send a beamformed signal 184 to the base station 102 in one or more transmit directions. The base station 102 may receive the beamformed signal from the UE 104 in one or more receive directions. The base station 102 / UE 104 may perform beam training to determine the best receive direction and the best transmit direction for each of the base station 102 / UE 104. The transmit direction and the receive direction of the base station 102 may be the same or may not be the same. The transmit direction and the receive direction of the UE 104 may be the same or may not be the same.

[0049] The base station 102 may include and / or be referred to as a gNB, a Node B, an eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmit receive point (TRP), a network node, a network entity, a network equipment, or some other suitable term. The base station 102 may be implemented as an integrated access and backhaul (IAB) node, a relay node, a sidelink node, an aggregated (monolithic) base station with a baseband unit (BBU) (including a CU and a DU) and a RU, or as a decomposed base station including one or more of a CU, a DU, and / or a RU. A set of base stations that may include decomposed base stations and / or aggregated base stations may be referred to as a next generation (NG) RAN (NG-RAN).

[0050] The core network 120 may include an access and mobility management function (AMF) 161, a session management function (SMF) 162, a user plane function (UPF) 163, a unified data management (UDM) 164, one or more location servers 168, and other functional entities. AMF 161 is a control node that handles signaling between UE 104 and core network 120. AMF 161 supports registration management, connection management, mobility management, and other functions. SMF 162 supports session management and other functions. UPF 163 supports packet routing, packet forwarding, and other functions. UDM 164 supports the generation of authentication and key agreement (AKA) credentials, user identity handling, access authorization, and subscription management. One or more location servers 168 are illustrated as including a gateway mobile location center (GMLC) 165 and a location management function (LMF) 166. However, in general, the one or more location servers 168 may include one or more location / positioning servers, which may include one or more of the GMLC 165, LMF 166, positioning determination entity (PDE), serving mobile location center (SMLC) or mobile positioning center (MPC), etc. The GMLC 165 and LMF 166 support UE location services. The GMLC 165 provides an interface for clients / applications (e.g., emergency services) to access UE positioning information. The LMF 166 receives measurement and assistance information from the NG-RAN and UE 104 via the AMF 161 to calculate the positioning of the UE 104. The NG-RAN may determine the positioning of the UE 104 using one or more positioning methods. Positioning the UE 104 may involve signal measurements, positioning estimates, and optional speed calculations based on these measurements. Signal measurements may be performed by the UE 104 and / or the serving base station 102. The measured signals may be based on a satellite positioning system (SPS) 170 (e.g., one or more of a global navigation satellite system (GNSS), a global positioning system (GPS), a non-terrestrial network (NTN), or other satellite positioning / location systems), LTE signals, wireless local area network (WLAN) signals, Bluetooth signals, a terrestrial beacon system (TBS), sensor-based information (e.g., an atmospheric pressure sensor, a motion sensor), an NR enhanced cell ID (NR E-CID) method, NR signals (e.g., multi-round trip time (multi-RTT), DL angle of departure (DL-AoD), DL time difference of arrival (DL-TDOA), UL time difference of arrival (UL-TDOA), and UL angle of arrival (UL-AoA) positioning), and / or one or more of other systems / signals / sensors.

[0051] Examples of UE 104 include cellular phones, smart phones, session initiation protocol (SIP) phones, laptops, personal digital assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, tablet computers, smart devices, wearable devices, vehicles, electric meters, gas pumps, large or small kitchen appliances, healthcare equipment, implants, sensors / actuators, displays, or any other similarly functional devices. Some of the UEs 104 may be referred to as IoT devices (e.g., parking meters, gas pumps, toasters, vehicles, heart monitors, etc.). UE 104 may also be referred to as stations, mobile stations, subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals, mobile phones, user agents, mobile clients, clients, or some other suitable terminology. In some scenarios, the term UE may also be applied to one or more supporting devices, such as in a device constellation arrangement. One or more of these devices may access the network collectively and / or individually.

[0052] Reference again Figure 1 In some aspects, the UE 104 may include: a selection component 198 configured to measure a channel condition of each of a plurality of antennas at the UE; and when in a radio resource control (RRC) idle mode, dynamically select at least one antenna from the plurality of antennas based on the channel condition. In some aspects, the selection component 198 may be configured to: measure a channel condition of a first set of antennas and a second set of antennas at the UE; and when in a radio resource control (RRC) idle mode, dynamically select at least one antenna from the first set of antennas or the second set of antennas based on the channel condition.

[0053] Although the following description may focus on 5G NR, the concepts described herein may be applicable to other similar areas such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

[0054] Figure 2A FIG200 is a diagram illustrating an example of a first subframe within a 5G NR frame structure. Figure 2B FIG230 is a diagram illustrating an example of DL channels within a 5G NR subframe. Figure 2C FIG250 is a diagram illustrating an example of a second subframe within a 5G NR frame structure. Figure 2DFIG280 is a diagram illustrating an example of UL channels within a 5G NR subframe. The 5G NR frame structure may be frequency division duplex (FDD) (wherein for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to either DL or UL), or may be time division duplex (TDD) (wherein for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to both DL and UL). Figure 2A , Figure 2C In the example provided, the 5G NR frame structure is assumed to be TDD, where subframe 4 is configured with slot format 28 (most of which are DL), where D is DL, U is UL, and F is flexible between DL / UL, and subframe 3 is configured with slot format 1 (all of which are UL). Although subframes 3 and 4 are shown as having slot formats 1 and 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0 and 1 are full DL and full UL, respectively. Other slot formats 2-61 include a mix of DL, UL and flexible symbols. The UE is configured with the slot format through the received slot format indicator (SFI) (dynamically configured through DL control information (DCI) or semi-statically / statically configured through radio resource control (RRC) signaling). Note that the following description also applies to the 5G NR frame structure as TDD.

[0055] FIG. 2A to FIG. 2D The frame structure is illustrated, and various aspects of the present disclosure may be applicable to other wireless communication technologies that may have different frame structures and / or different channels. A frame (10ms) may be divided into 10 equally sized subframes (1ms). Each subframe may include one or more time slots. A subframe may also include a microslot, which may include 7, 4, or 2 symbols. Each time slot may include 14 or 12 symbols, depending on whether the cyclic prefix (CP) is normal or extended. For a normal CP, each time slot may include 14 symbols, and for an extended CP, each time slot may include 12 symbols. The symbol on the DL may be a CP orthogonal frequency division multiplexing (OFDM) (CP-OFDM) symbol. The symbol on the UL may be a CP-OFDM symbol (for high throughput scenarios) or a discrete Fourier transform (DFT) extended OFDM (DFT-s-OFDM) symbol (for power-constrained scenarios; limited to single-stream transmission). The number of time slots within a subframe is based on the CP and parameter set. The parameter set defines the subcarrier spacing (SCS) (see Table 1). Symbol length / duration can be scaled by 1 / SCS.

[0056]

[0057] Table 1: Parameter set, SCS and CP

[0058] For normal CP (14 symbols / slot), different parameter sets μ0 to 4 allow 1, 2, 4, 8, and 16 slots per subframe, respectively. For extended CP, parameter set 2 allows 4 slots per subframe. Thus, for normal CP and parameter set μ, there are 14 symbols per slot and 2 per subframe. μ time slots. The subcarrier spacing can be equal to 2 μ *15kHz, where μ is parameter set 0 to 4. Therefore, the subcarrier spacing for parameter set μ=0 is 15kHz, and the subcarrier spacing for parameter set μ=4 is 240kHz. The symbol length / duration is inversely related to the subcarrier spacing. FIG. 2A to FIG. 2D An example of a parameter set μ=2 with a normal CP of 14 symbols per slot and 4 slots per subframe is provided. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is about 16.67 μs. Within a frame set, there may be one or more different bandwidth parts (BWPs) that are frequency-division multiplexed (see Figure 2B ). Each BWP may have a specific parameter set and CP (normal or extended).

[0059] A resource grid may be used to represent a frame structure. Each slot includes a resource block (RB) (also referred to as a physical RB (PRB)) extending over 12 consecutive subcarriers. The resource grid is divided into a plurality of resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0060] like Figure 2A As illustrated, some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include a demodulation RS (DM-RS) (indicated as R for a particular configuration, but other DM-RS configurations are possible) and a channel state information reference signal (CSI-RS) for channel estimation at the UE. The RS may also include a beam measurement RS (BRS), a beam refinement RS (BRRS), and a phase tracking RS (PT-RS).

[0061] Figure 2BExamples of various DL channels within a subframe of a frame are illustrated. A physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) (e.g., 1, 2, 4, 8, or 16 CCEs), each CCE including six RE groups (REGs), each REG including 12 consecutive REs in an OFDM symbol of an RB. A PDCCH within a BWP may be referred to as a control resource set (CORESET). The UE is configured to monitor PDCCH candidates in a PDCCH search space (e.g., a common search space, a UE-specific search space) during a PDCCH monitoring opportunity on a CORESET, wherein the PDCCH candidates have different DCI formats and different aggregation levels. Additional BWPs may be located at higher and / or lower frequencies on the channel bandwidth. A primary synchronization signal (PSS) may be within symbol 2 of a particular subframe of a frame. The PSS is used by UE 104 to determine subframe / symbol timing and physical layer identification. A secondary synchronization signal (SSS) may be within symbol 4 of a particular subframe of a frame. The SSS is used by the UE to determine the physical layer cell identity group number and the radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine the physical cell identifier (PCI). Based on the PCI, the UE can determine the location of the DM-RS. The physical broadcast channel (PBCH) carrying the master information block (MIB) can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block (also referred to as an SS block (SSB)). The MIB provides the system bandwidth and the number of RBs in the system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not sent over the PBCH (such as the system information block (SIB)), and paging messages.

[0062] like Figure 2C As illustrated, some of the REs carry DM-RS (indicated as R for a particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE may send a DM-RS for a physical uplink control channel (PUCCH) and a DM-RS for a physical uplink shared channel (PUSCH). The PUSCH DM-RS may be sent in the first or first two symbols of the PUSCH. Depending on whether a short PUCCH or a long PUCCH is sent and depending on the specific PUCCH format used, the PUCCH DM-RS may be sent in different configurations. The UE may send a sounding reference signal (SRS). The SRS may be sent in the last symbol of a subframe. The SRS may have a comb structure, and the UE may send the SRS on one of the teeth of the comb. The SRS may be used by the base station for channel quality estimation to achieve frequency-dependent scheduling of the UL.

[0063] Figure 2DExamples of various UL channels within a subframe of a frame are illustrated. The PUCCH may be located at a position as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, channel quality indicators (CQI), precoding matrix indicators (PMI), rank indicators (RI), and hybrid automatic repeat request (HARQ) acknowledgement (ACK) (HARQ-ACK) feedback (i.e., one or more HARQ ACK bits indicating one or more ACKs and / or negative ACKs (NACKs)). The PUSCH carries data and may additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and / or UCI.

[0064] Figure 3 370 is a block diagram of a base station 310 in an access network communicating with a UE 350. In the DL, Internet Protocol (IP) packets may be provided to a controller / processor 375. The controller / processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller / processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIB), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression / decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with delivery of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0065] The transmit (TX) processor 316 and receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1 (which includes the physical (PHY) layer) may include error detection on the transport channel, forward error correction (FEC) coding / decoding of the transport channel, interleaving, rate matching, mapping to the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. The TX processor 316 handles the mapping to the signal constellation based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-order phase shift keying (M-PSK), M-order quadrature amplitude modulation (M-QAM)). The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and / or frequency domain, and then combined using an inverse fast Fourier transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially pre-coded to generate multiple spatial streams. The channel estimates from the channel estimator 374 may be used to determine the coding and modulation schemes, as well as for spatial processing. The channel estimates may be derived from a reference signal and / or channel condition feedback sent by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318Tx. Each transmitter 318Tx may modulate a radio frequency (RF) carrier for transmission using a corresponding spatial stream.

[0066] At the UE 350, each receiver 354Rx receives a signal through its corresponding antenna 352. Each receiver 354Rx recovers the information modulated onto the RF carrier and provides the information to a receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial stream destined for the UE 350. If multiple spatial streams are destined for the UE 350, they can be combined into a single OFDM symbol stream by the RX processor 356. The RX processor 356 then converts the OFDM symbol stream from the time domain to the frequency domain using a fast Fourier transform (FFT). The frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier and the reference signal are recovered and demodulated by determining the most likely signal constellation point sent by the base station 310. These soft decisions can be based on channel estimates calculated by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals originally sent on the physical channel by base station 310. The data and control signals are then provided to controller / processor 359, which implements layer 3 and layer 2 functionality.

[0067] The controller / processor 359 may be associated with a memory 360 that stores program codes and data. The memory 360 may be referred to as a computer readable medium. In the UL, the controller / processor 359 provides demultiplexing between transport channels and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover IP packets. The controller / processor 359 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operations.

[0068] Similar to the functionality described in conjunction with DL transmissions performed by the base station 310, the controller / processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functionality associated with header compression / decompression and security (encryption, decryption, integrity protection, integrity verification); RLC layer functionality associated with delivery of upper layer PDUs, error correction through ARQ, concatenation, segmentation and reassembly of RLC SDUs, resegmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0069] Channel estimates derived by the channel estimator 358 based on a reference signal or feedback sent by the base station 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes and facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antennas 352 via separate transmitters 354Tx. Each transmitter 354Tx may modulate an RF carrier with a corresponding spatial stream for transmission.

[0070] UL transmissions are processed at the base station 310 in a manner similar to that described in conjunction with the receiver functionality at the UE 350. Each receiver 318Rx receives a signal through its respective antenna 320. Each receiver 318Rx recovers information modulated onto an RF carrier and provides the information to the RX processor 370.

[0071] The controller / processor 375 may be associated with a memory 376 that stores program codes and data. The memory 376 may be referred to as a computer readable medium. In the UL, the controller / processor 375 provides demultiplexing between transport channels and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover IP packets. The controller / processor 375 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operations.

[0072] At least one of the TX processor 368, the RX processor 356, and the controller / processor 359 may be configured to perform operations related to Figure 1 The selection component 198 combines various aspects.

[0073] In wireless communication, when the UE is in the CONNECT state with traffic, receive diversity and AsDiv algorithms may work when the UE hardware supports 4 antennas. The UE may utilize all possible antenna modes and maintain a balance between UE performance and power consumption, including downlink and uplink. However, when the UE is in RRC idle mode, the hardware may only support antenna diversity within a default pair, where the default pair may be Rx01. Idle antenna diversity may include two states: a first state 1Rx and a second state 2Rx. For the first state 1Rx, either Rx0 or Rx1 may be selected, while for the second state 2Rx, only Rx01 is available. For a UE in an idle state, the current antenna selection may be limited to the default Rx01 and may be used for idle activities such as SIB reading, receiving paging messages, neighbor cell measurements, etc.

[0074] In some instances, Rx0 or Rx1 may not be the best performing antenna among all antennas available at the UE, so that another antenna may have a better signal or may perform better than Rx0 or Rx1. Performance may be reduced for various reasons. For example, one of these antennas may have poor reference signal received power (RSRP) and / or poor signal-to-noise ratio (SNR) because the antenna is blocked by the user's hand. In some instances, paging message decoding failure may be due to poor SNR on the default antenna pair, which may result in poor performance or missed calls. In some instances, SIB decoding failure may occur due to poor SNR, which may result in a service interruption state. In yet other instances, the degraded RSRP may appear to be stable on the default antenna pair, and the poor Rx may remain unchanged throughout the idle mode, which may result in unnecessary reselection triggers due to poor signals.

[0075] Aspects presented herein provide a configuration for antenna selection in idle mode. The configuration may allow a UE to select an antenna based at least on a channel condition of each of a plurality of antennas at the UE when in RRC idle mode. At least one advantage of the present disclosure is that a UE may be configured to obtain channel condition information and support dynamic antenna selection when in RRC idle mode, which may improve UE performance.

[0076] Figure 44 is a diagram of dynamic antenna selection in RRC idle mode. In some instances, a UE may include multiple antennas. For example, a UE may include 4 antennas, and in some instances, a UE may have more or less than 4 antennas, such that the present disclosure is not intended to be limited to the aspects disclosed herein.

[0077] The UE may tune all 4 antennas and may trigger measurements to determine one or more antennas with the best channel conditions or signal quality. In some instances, the UE may perform measurements to determine the first best antenna, the second best antenna, or the best 4 antennas, where the antennas are ranked based on channel conditions or signal quality. The UE may perform measurements for a measurement period for an antenna (e.g., 4 antennas), where the measurement period may change dynamically. The measurement period may change dynamically based on power consumption.

[0078] In some aspects, if the signal is good on the active antenna pair (e.g., 2Rx) and the PDSCH result includes a 100% CRC pass rate, the UE may disable measurements across the four antennas (e.g., 4Rx) so that measurements across the inactive antennas are terminated. If the signal is greater than a first threshold (T0), the signal may be determined to be good on the active antenna pair. The first threshold T0 may be based on at least one of RSRP, reference signal received quality (RSRQ), or SNR. In such instances, the reference signal received quality (RSRQ) ... Figure 4 400, the UE may transition from a first state 402 in which 4 antennas (e.g., an active antenna pair and an inactive antenna pair) are being measured to a second state 406 in which 2 antennas are active and the measurement across the inactive antennas is terminated based on RSRP being greater than a first threshold T0 and having a 100% CRC pass rate (e.g., a 0% block error rate (BLER)).

[0079] In some aspects, if there is a large imbalance on the active antenna pair (e.g., 2Rx), the UE may trigger measurements across the four antennas (e.g., 4Rx). If the imbalance difference (e.g., imbalance Δ) between the active antenna pairs is greater than a fourth threshold (T3), the imbalance may be determined as a large imbalance. The fourth threshold T3 may be based on at least one of RSRP, RSRQ, or SNR. In such examples, reference Figure 4 In response to the active antenna pairs having different imbalances greater than a fourth threshold T3, the UE may transition from the second state 406 to a third state 404 where 2 antennas are active but measurements occur across all 4 antennas.

[0080] In some aspects, if the signal degrades and falls below a second threshold (T1), the UE may trigger measurements across all 4 antennas to determine if another antenna pair is better than the current antenna pair. If the other antenna pair has better signal quality than the current antenna pair, the UE may switch to the other antenna pair. For example, the UE may be in the second state 406 and may transition to the third state 404 if the signal quality across the current antenna pair is below the second threshold (T1). The second state 404 may include 2 antennas as active antennas, where measurements occur across all 4 antennas.

[0081] In some aspects, if the signal degrades and drops below a third threshold (T2), the UE may enable all four antennas to receive paging or SIB decoding in an effort to improve downlink reception performance. For example, the UE may be in the second state 406 or the third state 404, and if the signal quality drops below the third threshold T2, it may transition to the first state 402 so that all four antennas are configured to receive paging or SIB messages to improve downlink reception performance.

[0082] Figure 5 5 is a diagram of dynamic antenna selection in RRC idle mode. In some instances, a UE may include multiple antenna sets. For example, a UE may include a first antenna set and a second antenna set. In some aspects, each antenna set may include at least one antenna.

[0083] The UE may tune 2 antennas during the evaluation period and perform measurements across the first set and the second set. The UE may measure the inactive antenna pairs so that the UE may dynamically select at least one antenna or antenna pair with the strongest quality from the first set or the second set. The selected at least one antenna or antenna pair may be used for RRC idle activity.

[0084] Antenna measurements may include multiple timing options. For example, measurements may be performed on an inactive set of antennas during a discontinuous reception (DRX) off period. In some aspects, the measurement rate may be based on triggering each pair of antennas in the first set and the second set once per idle DRX (I-DRX) cycle or multiple I-DRX cycles. This may be defined based on the DRX cycle length configuration or other conditions. The measurement rate may be adaptive based on the RSRP level of the active antenna pair. For example, if the second threshold T1 is less than the RSRP level of the active antenna pair, but the RSRP level of the active antenna pair is less than or equal to the first threshold T0, the measurement may occur once every 4 I-DRX cycles. In some aspects, if the third threshold T2 is less than the RSRP level of the active antenna pair, but the RSRP level of the active antenna pair is less than or equal to the second threshold T1, the measurement may occur once every 2 I-DRX cycles. In some aspects, if the fourth threshold T3 is less than the RSRP level of the active antenna pair, but the RSRP level of the active antenna pair is less than or equal to the third threshold T2, the measurement may occur in each I-DRX cycle.

[0085] In some aspects, if the signal of the active antenna pair is greater than the first threshold T0, and the PDSCH result includes a 100% CRC pass rate (e.g., BLER=0%), the UE does not switch antennas and remains on the active pair. The UE may measure the inactive antenna pair. For example, referring to Figure 5 , the UE may be in a first state 502 consisting of 2 antennas in a first antenna set, and if the signals of the 2 antennas in the first antenna set are greater than a first threshold T0 and have a BLER of 0%, the UE remains in the first state 502 and does not switch states. For another example, the UE may be in a second state 504 consisting of 2 antennas in a second antenna set, and if the signals of the 2 antennas in the second antenna set are greater than a first threshold T0 and have a BLER of 0%, the UE remains in the second state 504 and does not switch states.

[0086] In some aspects, if the signal from the active antenna pair of the first antenna set or the second antenna set drops below or equal to the first threshold T0 or a PDSCH CRC failure is detected, the UE may trigger a measurement on the inactive antenna set and determine whether there is a better candidate for antenna selection. Figure 5 , if the UE is in the first state 502 and has an RSRP greater than the first threshold T0 on the second set, the UE may transition to the second state 504 so that the antenna pair at the second antenna set has a better signal than the antenna pair at the first antenna set. Figure 5If the UE is in the second state 504 and has an RSRP greater than a first threshold T0 on the first set, the UE may transition to the first state 502 such that the antenna pairs at the first antenna set have better signals than the antenna pairs at the second antenna set.

[0087] In some aspects, the UE may lock one antenna from the first antenna set or the second antenna set to the best antenna among the first antenna set and the second antenna set based on signal strength, such that the first set may include one antenna and the second set may include three antennas. The UE may periodically measure the three antennas in the second set to determine the best antenna from the second set. The UE may then determine the best antenna pair as the antenna from the first set and the antenna from the second set that has the strongest or highest quality.

[0088] Figure 6 600 is a call flow diagram of signaling between a UE 602 and a base station 604. The base station 604 may be configured to provide at least one cell. The UE 602 may be configured to communicate with the base station 604. For example, in Figure 1 In the context of , base station 604 may correspond to base station 102. In addition, UE 602 may correspond to at least UE 104. In another example, in Figure 3 In the context of , base station 604 may correspond to base station 310 and UE 602 may correspond to UE 350.

[0089] At 606, the base station 604 may send one or more reference signals to the UE 602. At 608, the UE 602 may measure a channel condition for each of a plurality of antennas at the UE. The UE 602 may measure the channel condition for each of the plurality of antennas at the UE based on the one or more reference signals received from the base station 604. In some aspects, the channel condition for each of the plurality of antennas may be measured during a measurement period. The measurement of the channel condition may be based on at least one threshold. In some aspects, the at least one threshold may be configurable or preconfigured. The UE may measure the channel condition based on a combination of Figure 4 Any of the aspects described above to measure channel conditions.

[0090] At 610, UE 602 may terminate the measurement of the channel condition of each of the plurality of inactive antennas at the UE. The UE may terminate the measurement of the channel condition of each of the plurality of inactive antennas in response to the channel condition on two active antennas of the plurality of antennas being greater than a first threshold T0 and the PDSCH result including a 100% cyclic redundancy check (CRC) pass rate. The UE may terminate the measurement of the channel condition of each of the plurality of inactive antennas based on the combination of Figure 4 Any of the aspects described above is used to terminate the measurement of channel conditions.

[0091] At 612, UE 602 may trigger measurement across the multiple antennas. In some aspects, the UE may trigger measurement across the multiple antennas in response to an imbalance in channel conditions between two active antennas in the multiple antennas being greater than a fourth threshold value T3. In some aspects, the multiple antennas may include four antennas, wherein the measurement is triggered across the four antennas. In some aspects, the UE may trigger measurement across the multiple antennas in response to the channel condition across a first active antenna pair in the multiple antennas being less than a second threshold value (T1). In some aspects, the multiple antennas may include four antennas, wherein the measurement is triggered across the four antennas. The UE may be based on a combination of Figure 4 The UE may determine whether the second antenna pair has a channel condition greater than a second threshold. In response to the channel condition across the first active antenna pair being less than the second threshold (T1), the UE may determine whether the second antenna pair has a channel condition greater than the second threshold. In some aspects, the UE may switch to the second antenna pair. The UE may switch to the second antenna pair in response to the second antenna pair in the plurality of antennas including a channel condition greater than the second threshold.

[0092] At 614, UE 602 may activate all antennas in the plurality of antennas to receive downlink signaling. The UE may activate all antennas in the plurality of antennas to receive downlink signaling in response to the channel condition of the plurality of antennas being less than a third threshold (T2). The UE may activate all antennas in the plurality of antennas to receive downlink signaling based on the combination of Figure 4 Any of the aspects described above activates all antennas to receive downlink signaling.

[0093] At 616, UE 602 may dynamically select at least one antenna from the plurality of antennas based on the channel condition. When in RRC idle mode, the UE may dynamically select at least one antenna from the plurality of antennas based on the channel condition. The UE may dynamically select at least one antenna from the plurality of antennas based on the channel condition. Figure 4 Any of the aspects described herein is used to dynamically select at least one antenna.

[0094] At 618, UE 602 may communicate with base station 604 using the dynamically selected at least one antenna.

[0095] Figure 7 700 is a flow chart of a method of wireless communication. The method may be performed by a UE (eg, UE 104; device 904). One or more of the illustrated operations may be omitted, swapped, or performed simultaneously. The method may allow a UE to select an antenna when in RRC idle mode.

[0096] At 702, the UE may measure a channel condition for each of a plurality of antennas at the UE. For example, 702 may be performed by the selection component 198 of the apparatus 904. In some aspects, the channel condition for each of the plurality of antennas may be measured during a measurement period. The measurement of the channel condition may be based on at least one threshold. In some aspects, the at least one threshold may be configurable or preconfigured. The UE may be based on a combination of Figure 4 Any of the aspects described above to measure channel conditions.

[0097] At 704, the UE may dynamically select at least one antenna from the plurality of antennas based on the channel condition. For example, 704 may be performed by the selection component 198 of the apparatus 904. When in RRC idle mode, the UE may dynamically select at least one antenna from the plurality of antennas based on the channel condition. The UE may dynamically select at least one antenna from the plurality of antennas based on the channel condition. Figure 4 Any of the aspects described herein is used to dynamically select at least one antenna.

[0098] Figure 8 800 is a flow chart of a method of wireless communication. The method may be performed by a UE (eg, UE 104; device 904). One or more of the illustrated operations may be omitted, swapped, or performed simultaneously. The method may allow a UE to select an antenna when in RRC idle mode.

[0099] At 802, the UE may measure a channel condition for each of a plurality of antennas at the UE. For example, 802 may be performed by the selection component 198 of the apparatus 904. In some aspects, the channel condition for each of the plurality of antennas may be measured during a measurement period. The measurement of the channel condition may be based on at least one threshold. In some aspects, the at least one threshold may be configurable or preconfigured. The UE may be based on a combination of Figure 4 Any of the aspects described above to measure channel conditions.

[0100] At 804, the UE may terminate the measurement of the channel condition of each of the multiple inactive antennas. For example, 804 may be performed by the selection component 198 of the device 904. The UE may terminate the measurement of the channel condition of each of the multiple inactive antennas in response to the channel condition on two active antennas of the multiple antennas being greater than the first threshold T0 and the PDSCH result including a 100% CRC pass rate. The UE may terminate the measurement of the channel condition of each of the multiple inactive antennas based on the combination of Figure 4 Any of the aspects described above is used to terminate the measurement of channel conditions.

[0101] At 806, the UE may trigger measurements across the multiple antennas. For example, 806 may be performed by the selection component 198 of the device 904. The UE may trigger measurements across the multiple antennas in response to an imbalance in channel conditions between two active antennas in the multiple antennas being greater than a fourth threshold T3. In some aspects, the multiple antennas may include four antennas, wherein the measurements are triggered across the four antennas. The UE may be based on a combination of Figure 4 Any of the aspects described can be used to trigger measurement.

[0102] At 808, the UE may trigger measurements across the multiple antennas. For example, 806 may be performed by the selection component 198 of the device 904. The UE may trigger measurements across the multiple antennas in response to the channel condition across the first active antenna pair in the multiple antennas being less than a second threshold (T1). In some aspects, the multiple antennas may include four antennas, wherein the measurements are triggered across the four antennas. The UE may be based on a combination of Figure 4 Any of the aspects described can be used to trigger measurement.

[0103] At 810, the UE can determine whether the second antenna pair has a channel condition greater than a second threshold. For example, 806 can be performed by the selection component 198 of the device 904.

[0104] At 812, the UE can switch to the second antenna pair. For example, 806 can be performed by the selecting component 198 of the device 904. The UE can switch to the second antenna pair in response to the second antenna pair of the plurality of antennas comprising a channel condition greater than a second threshold.

[0105] At 814, the UE may activate all antennas in the plurality of antennas to receive downlink signaling. For example, 806 may be performed by the selection component 198 of the device 904. The UE may activate all antennas in the plurality of antennas to receive downlink signaling in response to the channel condition of the plurality of antennas being less than a third threshold (T2).

[0106] At 816, the UE may dynamically select at least one antenna from the plurality of antennas based on the channel condition. For example, 816 may be performed by the selection component 198 of the apparatus 904. When in RRC idle mode, the UE may dynamically select at least one antenna from the plurality of antennas based on the channel condition. The UE may dynamically select at least one antenna from the plurality of antennas based on the channel condition. Figure 4 Any of the aspects described herein is used to dynamically select at least one antenna.

[0107] Fig. 9900 is a diagram illustrating an example of a hardware implementation for an apparatus 904. The apparatus 904 may be a UE, a component of a UE, or may implement UE functionality. In some aspects, the apparatus 904 may include a cellular baseband processor 924 (also referred to as a modem) coupled to one or more transceivers 922 (e.g., a cellular RF transceiver). The cellular baseband processor 924 may include on-chip memory 924'. In some aspects, the apparatus 904 may also include one or more subscriber identity module (SIM) cards 920 and an application processor 906, which is coupled to a secure digital (SD) card 908 and a screen 910. The application processor 906 may include on-chip memory 906'. In some aspects, the device 904 may also include a Bluetooth module 912, a WLAN module 914, an SPS module 916 (e.g., a GNSS module), one or more sensor modules 918 (e.g., an atmospheric pressure sensor / altimeter; a motion sensor such as an inertial measurement unit (IMU), a gyroscope, and / or an accelerometer; light detection and ranging (LIDAR), radio-aided detection and ranging (RADAR), sound navigation and ranging (SONAR), a magnetometer, audio, and / or other technologies for positioning), an additional memory module 926, a power supply 930, and / or a camera 932. The Bluetooth module 912, the WLAN module 914, and the SPS module 916 may include an on-chip transceiver (TRX) (or in some cases, only a receiver (RX)). The Bluetooth module 912, the WLAN module 914, and the SPS module 916 may include their own dedicated antennas and / or communicate using an antenna 980. The cellular baseband processor 924 communicates with the UE 104 and / or the RU associated with the network entity 902 through the transceiver 922 via one or more antennas 980. The cellular baseband processor 924 and the application processor 906 may each include a computer-readable medium / memory 924', 906', respectively. The additional memory module 926 may also be considered as a computer-readable medium / memory. Each computer-readable medium / memory 924', 906', 926 may be non-transitory. The cellular baseband processor 924 and the application processor 906 are each responsible for general processing, including executing software stored on a computer-readable medium / memory. The software enables the cellular baseband processor 924 / application processor 906 to perform the various functions described above when executed by the cellular baseband processor 924 / application processor 906. The computer-readable medium / memory can also be used to store data manipulated by the cellular baseband processor 924 / application processor 906 when executing the software. The cellular baseband processor 924 / application processor 906 may be a component of the UE 350 and may include the memory 360 and / or at least one of the TX processor 368 , the RX processor 356 , and the controller / processor 359 .In one configuration, the device 904 may be a processor chip (modem and / or applications) and include only the cellular baseband processor 924 and / or the application processor 906, and in another configuration, the device 904 may be an entire UE (eg, see. Figure 3 350) and includes additional modules of device 904.

[0108] As discussed above, component 198 is configured to measure channel conditions for each of a plurality of antennas at a UE; and dynamically select at least one antenna from the plurality of antennas based on the channel conditions when in RRC idle mode. Component 198 may be within the cellular baseband processor 924, the application processor 906, or both the cellular baseband processor 924 and the application processor 906. Component 198 may be one or more hardware components specifically configured to perform the stated process / algorithm, implemented by one or more processors configured to perform the stated process / algorithm, stored in a computer-readable medium for implementation by one or more processors, or some combination of the above. As shown, the device 904 may include a variety of components configured for various functions. In one configuration, the device 904 (and specifically the cellular baseband processor 924 and / or the application processor 906) includes a component for measuring the channel conditions for each of a plurality of antennas at the UE. The device includes a component for dynamically selecting at least one antenna from the plurality of antennas based on the channel conditions when in RRC idle mode. The device also includes a component for terminating the measurement of the channel condition of each antenna in the multiple antennas in response to the channel condition on the two active antennas being greater than the first threshold T0 and the PDSCH result including a 100% CRC pass rate. The device also includes a component for triggering the measurement across the multiple antennas in response to the imbalance of the channel condition between the two active antennas being greater than a fourth threshold (T3). The device also includes a component for triggering the measurement across the multiple antennas in response to the channel condition across the first active antenna pair being less than the second threshold (T1). The device also includes a component for determining whether the second antenna pair has a channel condition greater than the second threshold. The device also includes a component for switching to the second antenna pair in response to the second antenna pair including a channel condition greater than the second threshold. The device also includes a component for activating all antennas in the multiple antennas to receive downlink signaling in response to the channel condition of the multiple antennas being less than the third threshold (T2). The component can be a component 198 of the device 904 configured to perform the functions recorded by the component. As described above, the device 904 may include a TX processor 368, an RX processor 356, and a controller / processor 359. Thus, in one configuration, this component may be the TX Processor 368, the RX Processor 356, and / or the controller / processor 359 configured to perform the functions recited by this component.

[0109] Fig.10 1000 is a call flow diagram of signaling between UE 1002 and base station 1004. Base station 1004 may be configured to provide at least one cell. UE 1002 may be configured to communicate with base station 1004. For example, Figure 1 In the context of , base station 1004 may correspond to base station 102. In addition, UE 1002 may correspond to at least UE 104. For example, in Figure 3 In the context of , base station 1004 may correspond to base station 310 and UE 1002 may correspond to UE 350.

[0110] At 1006, the base station 1004 may send one or more reference signals to the UE 1002. At 1008, the UE 1002 may measure channel conditions of a first antenna set and a second antenna set at the UE. In some aspects, the first antenna set may include two antennas and the second antenna set may include two antennas. At least one of the first antenna set or the second antenna set may be inactive, wherein the measurement of the channel conditions occurs when at least one of the first antenna set or the second antenna set is inactive. In some aspects, the measurement of the channel conditions of the inactive set of at least one of the first antenna set or the second antenna set may be performed during a DRX off period. Each antenna set in the first antenna set or the second antenna set may be measured at least once during one or more DRX periods. In some aspects, the one or more DRX periods may include one or more I-DRX periods. In some aspects, the measurement of the first antenna set or the second antenna set may be triggered once per I-DRX period or multiple I-DRX periods. The measurement rate may be based on the RSRP level of the active set of the first antenna set or the second antenna set. The UE may measure the channel conditions of the inactive set of at least one of the first antenna set or the second antenna set based on a combination of the RSRP level of the active set of the first antenna set or the second antenna set. Figure 5 Any of the aspects described above to measure channel conditions.

[0111] At 1010, UE 1002 may remain on an active antenna set from the first antenna set or the second antenna set. The UE may remain on an active antenna set from the first antenna set or the second antenna set in response to a channel condition being greater than a first threshold (T0) and a PDSCH result including a 100% CRC pass rate. The UE may Figure 5 Any of the aspects described above is maintained on the active antenna set.

[0112] At 1012, UE 1002 may measure the inactive antenna set. The UE may measure the inactive antenna set in response to at least the channel condition of the active antenna set being less than a first threshold (T0). The UE may measure the inactive antenna set based on a combination of Figure 5Any of the aspects described herein is used to measure a set of inactive antennas.

[0113] At 1014, UE 1002 may switch to the inactive antenna set. If the channel condition of the inactive antenna set is greater than T0 or the active antenna set, the UE may switch to the inactive antenna set. The UE may switch to the inactive antenna set based on the combination of Figure 5 Any of the aspects described herein to switch to a set of inactive antennas.

[0114] At 1016, UE 1002 may dynamically select at least one antenna from the first antenna set or the second antenna set. When in RRC idle mode, the UE may dynamically select at least one antenna from the first antenna set or the second antenna set. When in RRC idle mode, the UE may dynamically select at least one antenna from the first antenna set or the second antenna set based on channel conditions. In some aspects, the first antenna set may include one antenna and the second antenna set may include three antennas. In such instances, antennas with the highest channel conditions may be selected to form the first antenna set, and the remaining antennas may be selected to form the second antenna set. In some aspects, the channel conditions of the second antenna set may be periodically measured to determine the antenna with the highest channel condition from the second antenna set. The UE may select the antenna with the highest channel condition based on a combination of Figure 5 Any of the aspects described herein is used to dynamically select at least one antenna.

[0115] At 1018, UE 1002 may communicate with base station 1004 using the dynamically selected at least one antenna.

[0116] Fig.11 1100 is a flow chart of a method of wireless communication. The method may be performed by a UE (eg, UE 104; device 1304). One or more of the illustrated operations may be omitted, swapped, or performed simultaneously. The method may allow a UE to select an antenna when in RRC idle mode.

[0117] At 1102, the UE may measure channel conditions of a first antenna set and a second antenna set at the UE. For example, 1102 may be performed by the selection component 198 of the device 1304. In some aspects, the first antenna set may include two antennas and the second antenna set may include two antennas. At least one antenna set in the first antenna set or the second antenna set may be inactive, wherein the measurement of the channel conditions occurs when at least one antenna set in the first antenna set or the second antenna set is inactive. In some aspects, the measurement of the channel conditions of the inactive set of at least one antenna set in the first antenna set or the second antenna set may be performed during a DRX off period. Each antenna set in the first antenna set or the second antenna set may be measured at least once during one or more DRX periods. In some aspects, the one or more DRX periods may include one or more idle DRX (I-DRX) periods. The UE may measure the channel conditions of the first antenna set or the second antenna set based on a combination of Figure 5 Any of the aspects described above to measure channel conditions.

[0118] At 1104, the UE may dynamically select at least one antenna from the first antenna set or the second antenna set. For example, 1104 may be performed by the selection component 198 of the device 1304. When in RRC idle mode, the UE may dynamically select at least one antenna from the first antenna set or the second antenna set. When in RRC idle mode, the UE may dynamically select at least one antenna from the first antenna set or the second antenna set based on channel conditions. In some aspects, the first antenna set may include one antenna and the second antenna set may include three antennas. In such instances, the antennas with the highest channel conditions may be selected to form the first antenna set, and the remaining antennas may be selected to form the second antenna set. In some aspects, the channel conditions of the second antenna set may be periodically measured to determine the antenna with the highest channel condition from the second antenna set. The UE may select the antenna based on a combination of Figure 5 Any of the aspects described herein is used to dynamically select at least one antenna.

[0119] Fig.12 1200 is a flow chart of a method of wireless communication. The method may be performed by a UE (eg, UE 104; device 1304). One or more of the illustrated operations may be omitted, swapped, or performed simultaneously. The method may allow a UE to select an antenna when in RRC idle mode.

[0120] At 1202, the UE may measure channel conditions of a first antenna set and a second antenna set at the UE. For example, 1202 may be performed by the selection component 198 of the device 1304. In some aspects, the first antenna set may include two antennas and the second antenna set may include two antennas. At least one antenna set in the first antenna set or the second antenna set may be inactive, wherein the measurement of the channel conditions occurs when at least one antenna set in the first antenna set or the second antenna set is inactive. In some aspects, the measurement of the channel conditions of the inactive set of at least one antenna set in the first antenna set or the second antenna set may be performed during a DRX off period. Each antenna set in the first antenna set or the second antenna set may be measured at least once during one or more DRX periods. In some aspects, the one or more DRX periods may include one or more I-DRX periods. In some aspects, the measurement of the first antenna set or the second antenna set may be triggered once per I-DRX period or multiple I-DRX periods. The measurement rate may be based on the RSRP level of the active set of the first antenna set or the second antenna set. The UE may measure the channel conditions of the inactive set of at least one antenna set in the first antenna set or the second antenna set based on a combination of the RSRP level of the active set of the first antenna set or the second antenna set. Figure 5 Any of the aspects described above to measure channel conditions.

[0121] At 1204, the UE may remain on an active antenna set from the first antenna set or the second antenna set. For example, 1204 may be performed by the selection component 198 of the device 1304. The UE may remain on an active antenna set from the first antenna set or the second antenna set in response to the channel condition being greater than the first threshold (T0) and the PDSCH result including a 100% CRC pass rate. The UE may remain on an active antenna set from the first antenna set or the second antenna set based on a combination of Figure 5 Any of the aspects described above is maintained on the active antenna set.

[0122] At 1206, the UE may measure the inactive antenna set. For example, 1206 may be performed by the selection component 198 of the device 1304. The UE may measure the inactive antenna set in response to at least the channel condition of the active antenna set being less than the first threshold (T0). The UE may measure the inactive antenna set based on the combination of Figure 5 Any of the aspects described herein is used to measure a set of inactive antennas.

[0123] At 1208, the UE may switch to the inactive antenna set. For example, 1208 may be performed by the selection component 198 of the device 1304. If the channel condition of the inactive antenna set is greater than T0 or the active antenna set, the UE may switch to the inactive antenna set. The UE may switch to the inactive antenna set based on the combination of Figure 5 Any of the aspects described herein to switch to a set of inactive antennas.

[0124] At 1210, the UE may dynamically select at least one antenna from the first antenna set or the second antenna set. For example, 1210 may be performed by the selection component 198 of the device 1304. When in RRC idle mode, the UE may dynamically select at least one antenna from the first antenna set or the second antenna set. When in RRC idle mode, the UE may dynamically select at least one antenna from the first antenna set or the second antenna set based on channel conditions. In some aspects, the first antenna set may include one antenna and the second antenna set may include three antennas. In such instances, the antennas with the highest channel conditions may be selected to form the first antenna set, and the remaining antennas may be selected to form the second antenna set. In some aspects, the channel conditions of the second antenna set may be periodically measured to determine the antenna with the highest channel condition from the second antenna set. The UE may select the antenna based on a combination of Figure 5 Any of the aspects described herein is used to dynamically select at least one antenna.

[0125] Fig.131300 is a diagram illustrating an example of a hardware implementation for an apparatus 1304. The apparatus 1304 may be a UE, a component of a UE, or may implement UE functionality. In some aspects, the apparatus 1304 may include a cellular baseband processor 1324 (also referred to as a modem) coupled to one or more transceivers 1322 (e.g., a cellular RF transceiver). The cellular baseband processor 1324 may include on-chip memory 1324'. In some aspects, the apparatus 1304 may also include one or more subscriber identity module (SIM) cards 1320 and an application processor 1306, which is coupled to a secure digital (SD) card 1308 and a screen 1310. The application processor 1306 may include on-chip memory 1306'. In some aspects, the device 1304 may also include a Bluetooth module 1312, a WLAN module 1314, an SPS module 1316 (e.g., a GNSS module), one or more sensor modules 1318 (e.g., an atmospheric pressure sensor / altimeter; a motion sensor such as an inertial measurement unit (IMU), a gyroscope, and / or an accelerometer; light detection and ranging (LIDAR), radio-aided detection and ranging (RADAR), sound navigation and ranging (SONAR), a magnetometer, audio, and / or other technologies for positioning), an additional memory module 1326, a power source 1330, and / or a camera 1332. The Bluetooth module 1312, the WLAN module 1314, and the SPS module 1316 may include an on-chip transceiver (TRX) (or in some cases, only a receiver (RX)). The Bluetooth module 1312, the WLAN module 1314, and the SPS module 1316 may include their own dedicated antennas and / or communicate using an antenna 1380. The cellular baseband processor 1324 communicates with the UE 104 and / or the RU associated with the network entity 1302 through the transceiver 1322 via one or more antennas 1380. The cellular baseband processor 1324 and the application processor 1306 may each include a computer-readable medium / memory 1324', 1306', respectively. The additional memory module 1326 may also be considered as a computer-readable medium / memory. Each computer-readable medium / memory 1324', 1306', 1326 may be non-transitory. The cellular baseband processor 1324 and the application processor 1306 are each responsible for general processing, including executing software stored on a computer-readable medium / memory. The software enables the cellular baseband processor 1324 / application processor 1306 to perform the various functions described above when executed by the cellular baseband processor 1324 / application processor 1306. The computer-readable medium / memory can also be used to store data manipulated by the cellular baseband processor 1324 / application processor 1306 when executing the software.The cellular baseband processor 1324 / application processor 1306 may be a component of the UE 350 and may include the memory 360 and / or at least one of the TX processor 368, the RX processor 356, and the controller / processor 359. In one configuration, the device 1304 may be a processor chip (modem and / or application) and include only the cellular baseband processor 1324 and / or the application processor 1306, and in another configuration, the device 1304 may be the entire UE (e.g., see. Figure 3 350) and includes additional modules of device 1304.

[0126] As discussed above, component 198 is configured to: measure channel conditions of a first antenna set and a second antenna set at the UE; and when in RRC idle mode, dynamically select at least one antenna from the first antenna set or the second antenna set based on the channel conditions. Component 198 may be within the cellular baseband processor 1324, the application processor 1306, or both the cellular baseband processor 1324 and the application processor 1306. Component 198 may be one or more hardware components that are specifically configured to perform the stated process / algorithm, implemented by one or more processors configured to perform the stated process / algorithm, stored in a computer-readable medium for implementation by one or more processors, or some combination of the above. As shown, device 1304 may include multiple components configured for various functions. In one configuration, device 1304 (and specifically cellular baseband processor 1324 and / or application processor 1306) includes a component for measuring channel conditions of a first antenna set and a second antenna set at the UE. The device includes a component for dynamically selecting at least one antenna from a first antenna set or a second antenna set based on channel conditions when in RRC idle mode. The device also includes a component for remaining on an active antenna set from a first antenna set or a second antenna set in response to a channel condition being greater than a first threshold (T0) and a PDSCH result including a 100% CRC pass rate. The device also includes a component for measuring an inactive antenna set in response to a channel condition of at least an active antenna set being less than a first threshold (T0). The device also includes a component for switching to an inactive antenna set if the channel condition of the inactive antenna set is greater than T0 or an active antenna set. The component may be a component 198 of the device 1304 configured to perform the functions recorded by the component. As described above, the device 1304 may include a TX processor 368, an RX processor 356, and a controller / processor 359. Therefore, in one configuration, the component may be a TX processor 368, an RX processor 356, and / or a controller / processor 359 configured to perform the functions recorded by the component.

[0127] It should be understood that the specific order or hierarchy of the blocks in the disclosed process / flowchart is merely an illustration of an exemplary approach. It should be understood that the specific order or hierarchy of the blocks in the process / flowchart may be rearranged based on design preferences. In addition, some blocks may be combined or omitted. The attached method claims provide the elements of the various blocks in a sample order, but are not limited to the specific order or hierarchy provided.

[0128] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects. Therefore, the claims are not limited to the various aspects described herein, but should be given the full scope consistent with the language claims. Unless otherwise specified, reference to an element in the singular form does not mean "one and only one", but "one or more". Terms such as "if", "when" and "while" do not mean a direct temporal relationship or reaction. That is, these phrases (such as "when ...") do not mean an immediate action in response to the occurrence of an action or during the occurrence of an action, but simply imply that if the conditions are met, the action will occur, but no specific or immediate time limit is required for the occurrence of the action. The word "exemplary" is used herein to mean "used as an example, instance, or illustration". Any aspect described as "exemplary" herein is not necessarily interpreted as being preferred or having advantages over other aspects. Unless otherwise specified, the term "some" refers to one or more. Combinations such as "at least one of A, B, or C", "one or more of A, B, or C", "at least one of A, B and C", "one or more of A, B, and C", and "A, B, C, or any combination thereof" include any combination of A, B, and / or C, and may include multiple A, multiple B, or multiple C. Specifically, combinations such as "at least one of A, B, or C", "one or more of A, B, or C", "at least one of A, B, and C", "one or more of A, B, and C", and "A, B, C, or any combination thereof" may be only A, only B, only C, A and B, A and C, B and C, or A and B and C, where any such combination may contain one or more members of A, B, or C. A set should be interpreted as a set of elements, where the number of elements is one or more. Thus, for a set of X, X will include one or more elements. If the first device receives data from the second device or sends data to the second device, data can be directly received / sent between the first device and the second device, or data can be indirectly received / sent between the first device and the second device through a collection of devices. All structural and functional equivalents of the elements of the various aspects described throughout the present disclosure that are known or will be known later to those of ordinary skill in the art are expressly incorporated herein by reference and are covered by the claims. In addition, nothing disclosed herein is intended to be dedicated to the public, regardless of whether such disclosure is explicitly recorded in the claims. The words "module", "mechanism", "element", "device", etc. cannot replace the word "component". Therefore, no claim element will be understood as a component plus function unless the element is explicitly recorded using the phrase "component for..."

[0129] As used herein, the phrase "based on" should not be interpreted as referring to a closed set of information, one or more conditions, one or more factors, etc. In other words, the phrase "based on A" (where "A" can be information, conditions, factors, etc.) should be interpreted as "based at least on A" unless specifically stated differently.

[0130] The following aspects are merely illustrative and may be combined with other aspects or teachings described herein without limitation.

[0131] Aspect 1 is a method for performing wireless communication at a UE, the method comprising: measuring a channel condition of each of a plurality of antennas at the UE; and dynamically selecting at least one antenna from the plurality of antennas based on the channel condition when in an RRC idle mode.

[0132] Aspect 2 is a method according to aspect 1, the method further comprising: the channel condition of each of the multiple antennas is measured during a measurement period, wherein the measurement of the channel condition is based on at least one threshold.

[0133] Aspect 3 is a method according to any one of Aspects 1 and 2, the method further comprising: the at least one threshold is configurable or pre-configured.

[0134] Aspect 4 is a method according to any one of Aspects 1 to 3, the method further comprising: terminating the measurement of the channel condition of each of the multiple inactive antennas in response to the channel condition on the two active antennas being greater than a first threshold (T0) and the PDSCH result including a 100% CRC pass rate.

[0135] Aspect 5 is a method according to any one of aspects 1 to 4, the method further comprising: triggering the measurement across the multiple antennas in response to the imbalance of the channel condition between two active antennas being greater than a fourth threshold (T3).

[0136] Aspect 6 is a method according to any one of aspects 1 to 5, the method further comprising: the plurality of antennas comprises four antennas, wherein the measurement is triggered across the four antennas.

[0137] Aspect 7 is a method according to any one of Aspects 1 to 6, the method further comprising: triggering the measurement across the multiple antennas in response to the channel condition across the first active antenna pair being less than a second threshold (T1); and determining whether the second antenna pair has a channel condition greater than the second threshold.

[0138] Aspect 8 is a method according to any one of aspects 1 to 7, the method further comprising: the plurality of antennas comprises four antennas.

[0139] Aspect 9 is a method according to any one of aspects 1 to 8, the method further comprising: switching to the second antenna pair in response to the second antenna pair including the channel condition greater than the second threshold.

[0140] Aspect 10 is a method according to any one of aspects 1 to 9, the method further comprising: activating all antennas of the multiple antennas to receive downlink signaling in response to the channel condition of the multiple antennas being less than a third threshold (T2).

[0141] Aspect 11 is an apparatus for wireless communication at a UE, the apparatus comprising: at least one processor, the at least one processor coupled to a memory and at least one transceiver, the at least one processor configured to implement any one of aspects 1 to 10.

[0142] Aspect 12 is an apparatus for performing wireless communication at a UE, the apparatus comprising: a component for implementing any one of aspects 1 to 10.

[0143] Aspect 13 is a computer-readable medium storing computer-executable code, wherein the code, when executed by a processor, causes the processor to implement any one of aspects 1 to 10.

[0144] Aspect 14 is a method for performing wireless communications at a UE, the method comprising: measuring channel conditions of a first antenna set and a second antenna set at the UE; and when in an RRC idle mode, dynamically selecting at least one antenna from the first antenna set or the second antenna set based on the channel conditions.

[0145] Aspect 15 is a method according to aspect 14, the method further comprising: the first antenna set includes two antennas and the second antenna set includes two antennas.

[0146] Aspect 16 is a method according to any one of Aspects 14 and 15, the method further comprising: at least one of the first antenna set or the second antenna set is inactive, wherein the measurement of the channel condition occurs when the at least one of the first antenna set or the second antenna set is inactive.

[0147] Aspect 17 is a method according to any one of Aspects 14 to 16, the method further comprising: the measurement of the channel condition of the inactive set of the at least one antenna set in the first antenna set or the second antenna set is performed during a non-DRX off period.

[0148] Aspect 18 is a method according to any one of aspects 14 to 17, the method further comprising: measuring each antenna set in the first antenna set or the second antenna set at least once during one or more DRX periods.

[0149] Aspect 19 is a method according to any one of Aspects 14 to 18, the method further comprising: the one or more DRX periods include one or more I-DRX segments, wherein measurement of the first antenna set or the second antenna set is triggered once per I-DRX period or multiple I-DRX periods, wherein the measurement rate is based on the RSRP level of the active set of the first antenna set or the second antenna set.

[0150] Aspect 20 is a method according to any one of Aspects 14 to 19, the method further comprising: remaining on an active antenna set from the first antenna set or the second antenna set in response to the channel condition being greater than a first threshold (T0) and the PDSCH result including a 100% CRC pass rate.

[0151] Aspect 21 is a method according to any one of Aspects 14 to 20, the method further comprising: measuring an inactive antenna set in response to the channel condition of at least the active antenna set being less than a first threshold (T0); and switching to the inactive antenna set if the channel condition of the inactive antenna set is greater than T0 or the active antenna set.

[0152] Aspect 22 is a method according to any one of Aspects 14 to 21, the method further comprising: the first antenna set includes one antenna, and the second antenna set includes three antennas, wherein the antenna with the highest channel condition is selected to form the first antenna set, and the remaining antennas are selected to form the second antenna set.

[0153] Aspect 23 is a method according to any one of aspects 14 to 22, the method further comprising: periodically measuring the channel condition of the second antenna set to determine an antenna with the highest channel condition from the second antenna set.

[0154] Aspect 24 is an apparatus for wireless communication at a UE, the apparatus comprising: at least one processor coupled to a memory and at least one transceiver, the at least one processor being configured to implement any one of aspects 14 to 23.

[0155] Aspect 25 is an apparatus for wireless communication at a UE, the apparatus comprising: means for implementing any one of aspects 14 to 23.

[0156] Aspect 26 is a computer-readable medium storing computer-executable code, wherein the code, when executed by a processor, causes the processor to implement any one of aspects 14 to 23.

Claims

1. An apparatus for wireless communication at a User Equipment (UE), the apparatus comprises: a memory; and at least one processor coupled to the memory and configured, at least in part based on information stored in the memory, to: measure the channel condition of each of a plurality of antennas at the UE; and dynamically select at least one antenna from the plurality of antennas based on the channel condition when in Radio Resource Control (RRC) idle mode.

2. The apparatus according to claim 1, the apparatus further comprises: a transceiver coupled to the at least one processor.

3. The apparatus according to claim 1, wherein the channel condition of each of the plurality of antennas is measured during a measurement period, and the measurement of the channel condition is based on at least one threshold.

4. The apparatus according to claim 3, wherein the at least one threshold is configurable or pre-configured.

5. The apparatus according to claim 3, wherein the at least one processor is configured to: terminate the measurement of the channel condition of each of a plurality of inactive antennas in response to the channel conditions on two active antennas being greater than a first threshold (T0) and the Physical Downlink Shared Channel (PDSCH) result including a 100% Cyclic Redundancy Check (CRC) passing rate.

6. The apparatus according to claim 3, wherein the at least one processor is configured to: trigger the measurement across the plurality of antennas in response to an imbalance in the channel conditions between two active antennas being greater than a fourth threshold (T3).

7. The apparatus according to claim 6, wherein the plurality of antennas comprises four antennas, and the measurement is triggered across the four antennas.

8. The apparatus according to claim 3, wherein the at least one processor is configured to: trigger the measurement across the plurality of antennas in response to the channel condition across a first active antenna pair being less than a second threshold (T1); and determine whether a second antenna pair has a channel condition greater than the second threshold.

9. The apparatus according to claim 8, wherein the plurality of antennas comprises four antennas.

10. The apparatus according to claim 8, wherein the at least one processor is configured to: switch to the second antenna pair in response to the second antenna pair including the channel condition greater than the second threshold.

11. The apparatus according to claim 3, wherein the at least one processor is configured to: activate all antennas in the plurality of antennas to receive downlink signaling in response to the channel conditions of the plurality of antennas being less than a third threshold (T2).

12. A method for wireless communication at a User Equipment (UE), the method comprises: measuring the channel condition of each of a plurality of antennas at the UE; and dynamically selecting at least one antenna from the plurality of antennas based on the channel condition when in Radio Resource Control (RRC) idle mode.

13. The method of claim 12, wherein the channel condition for each of the plurality of antennas is measured during a measurement period, wherein the measurement of the channel condition is based on at least one threshold.

14. The method according to claim 13, further comprising: include: The measuring of the channel condition for each of the plurality of inactive antennas is terminated in response to the channel condition on two active antennas being greater than a first threshold (T0) and a physical downlink shared channel (PDSCH) result including a 100% cyclic redundancy check (CRC) pass rate.

15. The method according to claim 13, further comprising: include: The measurements across the plurality of antennas are triggered in response to an imbalance in the channel condition between two active antennas being greater than a fourth threshold (T3).

16. The method according to claim 13, further comprising: include: triggering the measurements across the plurality of antennas in response to the channel condition across a first active antenna pair being less than a second threshold (T1); as well as A determination is made as to whether the second antenna pair has a channel condition greater than the second threshold.

17. An apparatus for wireless communication at a user equipment (UE), the apparatus include: Memory; and at least one processor coupled to the memory and based at least in part on the information stored in the memory, the at least one processor configured to: measuring a channel condition of a first antenna set and a second antenna set at the UE; as well as At least one antenna is dynamically selected from the first antenna set or the second antenna set based on the channel condition while in a radio resource control (RRC) idle mode.

18. The device according to claim 17, further comprising: include: A transceiver is coupled to the at least one processor.

19. The apparatus of claim 17, wherein the first set of antennas comprises two antennas and the second set of antennas comprises two antennas.

20. The apparatus of claim 19, wherein at least one of the first antenna set or the second antenna set is inactive, wherein the measurement of the channel condition occurs when the at least one of the first antenna set or the second antenna set is inactive.

21. The apparatus of claim 20, wherein the measuring of the channel condition of the inactive set of the at least one of the first antenna set or the second antenna set is performed during a discontinuous reception (DRX) off period.

22. The apparatus of claim 19, wherein each of the first antenna set or the second antenna set is measured at least once during one or more DRX periods.

23. The apparatus of claim 22, wherein the one or more DRX periods include one or more idle DRX (I-DRX) periods, wherein measurement of the first antenna set or the second antenna set is triggered once per I-DRX period or multiple I-DRX periods, wherein a measurement rate is based on an RSRP level of an active set of the first antenna set or the second antenna set.

24. The apparatus of claim 19, wherein the at least one processor is configured to: Remaining on an active antenna set from the first antenna set or the second antenna set in response to the channel condition being greater than a first threshold (T0) and a physical downlink shared channel (PDSCH) result including a 100% cyclic redundancy check (CRC) pass rate.

25. The apparatus of claim 19, wherein the at least one processor is configured to: measuring an inactive antenna set in response to the channel condition of at least the active antenna set being less than a first threshold (T0); and If the channel condition of the inactive antenna set is greater than T0 or the active antenna set, switching to the inactive antenna set.

26. The apparatus of claim 17, wherein the first antenna set includes one antenna and the second antenna set includes three antennas, wherein an antenna with the highest channel condition is selected to constitute the first antenna set, and the remaining antennas are selected to constitute the second antenna set.

27. The apparatus of claim 26, wherein the channel condition of the second antenna set is measured periodically to determine an antenna with the highest channel condition from the second antenna set.

28. A method for wireless communication at a user equipment (UE), the method include: measuring a channel condition of a first antenna set and a second antenna set at the UE; as well as At least one antenna is dynamically selected from the first antenna set or the second antenna set based on the channel condition while in a radio resource control (RRC) idle mode.

29. The method of claim 28, wherein the first antenna set includes two antennas and the second antenna set includes two antennas.

30. The method of claim 29, wherein at least one of the first antenna set or the second antenna set is inactive, wherein the measuring of the channel condition occurs when the at least one of the first antenna set or the second antenna set is inactive.

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