Rule-based beam update during secondary cell group (SCG) dormant period

Abstract

A wireless communication method for a user equipment (UE), comprising entering a dormant period for a secondary cell group (SCG) for a base station (BS), during which no downlink (DL) data or control transmission is received from the SCG; performing channel state information (CSI) measurements on the SCG during the dormant period to generate a measurement report; determining an uplink (UL) beam of a primary secondary cell (PSCELL) of the SCG; transmitting the measurement report to the BS on the UL beam of the SCG; and during the dormant period and after transmitting the measurement report, determining one or more downlink (DL) beams for communication on the SCG based on one or more rules and based on the measurement report, wherein the one or more rules cause the BS to determine the same one or more DL beams based on the measurement report.

Description

Background Art

[0001] field

[0002] Aspects of the present disclosure relate generally to wireless communication systems, and more particularly to wireless communications involving a dormant period of a wireless communication system. Background Art

[0004] Wireless communication networks are widely deployed to provide various communication services, such as voice, video, packet data, messaging, broadcast, and the like. These wireless networks can be multiple access networks that can support multiple users by sharing available network resources. Such networks, which are typically multiple access networks, support communications for multiple users by sharing available network resources. An example of such a network is the Universal Terrestrial Radio Access Network (UTRAN). UTRAN is a radio access network (RAN) defined as a part of the Universal Mobile Telecommunications System (UMTS), a third generation (3G) mobile phone technology supported by the Third Generation Partnership Project (3GPP). Examples of multiple access network formats include code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, and single carrier FDMA (SC-FDMA) networks.

[0005] A wireless communication network may include several base stations, or Node Bs, capable of supporting communication for several user equipment (UEs). UEs may communicate with a base station via downlinks and uplinks. The downlink (or forward link) refers to the communication link from a base station to a UE, while the uplink (or reverse link) refers to the communication link from a UE to a base station.

[0006] A base station may transmit data and control information to a UE on the downlink and / or may receive data and control information from a UE on the uplink. On the downlink, transmissions from a base station may encounter interference due to transmissions from neighboring base stations or from other wireless radio frequency (RF) transmitters. On the uplink, transmissions from a UE may encounter interference from uplink transmissions of other UEs communicating with neighboring base stations or from other wireless RF transmitters. This interference may degrade the performance of both the downlink and uplink.

[0007] As the demand for mobile broadband access continues to grow, the potential for interference and congested networks continues to grow as more UEs access long-range wireless communication networks and more short-range wireless systems are being deployed in communities. Research and development continue to advance wireless technologies to not only meet the growing demand for mobile broadband access, but also to improve and enhance the user experience with mobile communications.

[0008] Overview

[0009] In one aspect of the present disclosure, a wireless communication method for a user equipment (UE) includes entering a dormant period for a secondary cell group (SCG) of a base station (BS) during which no downlink (DL) data or control transmission is received from the SCG; performing channel state information (CSI) measurements on the SCG during the dormant period to generate a measurement report; determining an uplink (UL) beam of a primary secondary cell (PSCELL) of the SCG; transmitting the measurement report to the BS on the UL beam of the SCG; and / or during the dormant period and after transmitting the measurement report, determining one or more downlink (DL) beams to be used for communication on the SCG based on one or more rules and based on the measurement report, wherein the one or more rules cause the BS to determine the same one or more DL beams based on the measurement report. In certain aspects, the method may also include changing a transmission code point (TCI) state on the UE to the one or more DL beams, wherein changing the TCI state on the UE to the one or more downlink beams is performed without signaling from the BS. In certain aspects, determining an uplink (UL) beam is based on following a control resource set (CORESET) with a lowest ID and / or determining an uplink (UL) beam includes selecting multiple UL beams to follow the determined one or more DL beams, wherein the measurement report is transmitted to the BS over a beam sweep during PUCCH / SRS transmission on the multiple UL beams.

[0010] In additional aspects of the present disclosure, performing measurements in an SCG includes measuring at least one of a channel state information reference signal (CSI-RS) or a synchronization and signal block (SSB) of a primary secondary cell (PSCELL) or at least one of one or more secondary cells (SCELLs) of the SCG. In certain aspects, the measurements may include measuring the CSI on the PSCELL of the SCG when the PSCELL and the one or more SCELLs are on the same frequency band, and measuring the CSI on the PSCELL and the one or more SCELLs of the SCG when the PSCELL and the SCELLs are on different frequency bands.

[0011] In certain aspects of the present disclosure, a dormant period may be entered after receiving an SCG dormant command from a secondary node of the SCG, wherein entering the dormant period for the SCG is based on receiving the SCG dormant command. In certain aspects, the method may further include transitioning from the dormant period to an active period; and / or communicating with the BS using the determined one or more DL beams after transitioning to the active period. The dormant period may be exited after receiving an activation command from a master node (MN) of the BS, wherein transitioning from the dormant period to the active period is based on receiving the activation command.

[0012] In certain aspects, prior to entering the dormant period, the method may include receiving, from the BS, an indication of one or more rules for determining the one or more downlink beams, wherein determining the one or more downlink beams is based on the one or more rules.

[0013] In one aspect of the present disclosure, a wireless communication method for a base station (BS) may include instructing a user equipment (UE) to enter a dormant period for a secondary cell group (SCG), during which the UE will not receive downlink (DL) data or control transmission from the SCG; receiving channel state information (CSI) measurements in a measurement report from the UE on a UL beam of a primary secondary cell (PSCELL) of the SCG during the dormant period for the SCG; and / or determining one or more downlink (DL) beams for communicating with the UE on the SCG based on one or more rules and based on the measurement report during the dormant period and after transmitting the measurement report, wherein the one or more rules cause the UE to determine the same one or more DL beams based on the measurement report.

[0014] In an additional aspect of the present disclosure, the method includes: monitoring multiple uplink (UL) beams for receiving measurement reports, wherein the multiple UL beams for monitoring are determined by following one or more determined DL beams, wherein the measurement report is transmitted to the BS over a beam sweep on the multiple UL beams during PUCCH / SRS transmission; and / or determining an uplink (UL) beam for receiving measurement reports, wherein determining the UL beam is based on following a control resource set (CORESET) with a lowest ID.

[0015] In certain aspects, the measurement report is based on measuring at least one of a channel state information reference signal (CSI-RS) or a synchronization and signal block (SSB) of a primary secondary cell (PSCELL) or at least one of one or more secondary cells (SCELLs) of the SCG. In certain aspects, the measurement report is based on measuring the CSI on the PSCELL of the SCG when the PSCELL and the one or more SCELLs are on the same frequency band and / or measuring the CSI on the PSCELL of the SCG and the one or more SCELLs when the PSCELL and the SCELLs are on different frequency bands.

[0016] In an additional aspect of the present disclosure, the method may include changing a transmission code point (TCI) state on the UE to one or more DL beams, wherein changing the TCI state on the UE to the one or more downlink beams is performed without signaling from the BS.

[0017] In some embodiments, the method may include instructing the UE to enter a dormant period for the SCG based on a request from the UE to enter dormancy. In some embodiments, the method may include transitioning from the dormant period to an active period; and / or communicating with the UE using the determined one or more DL beams after transitioning to the active period.

[0018] In an additional aspect of the present disclosure, a non-transitory computer-readable medium having program code recorded thereon is disclosed. The program code further includes code for entering a dormant period for a secondary cell group (SCG) of a base station (BS), during which no downlink (DL) data or control transmission is received from the SCG; performing channel state information (CSI) measurements on the SCG to generate a measurement report during the dormant period; determining an uplink (UL) beam of a primary secondary cell (PSCELL) of the SCG; transmitting the measurement report to the BS on the UL beam of the SCG; and / or during the dormant period and after transmitting the measurement report, determining one or more downlink (DL) beams for communication on the SCG based on one or more rules and based on the measurement report, wherein the one or more rules cause the BS to determine the same one or more DL beams based on the measurement report.

[0019] In an additional aspect of the present disclosure, a non-transitory computer-readable medium having program code recorded thereon is disclosed. The program code further includes code for instructing a user equipment (UE) to enter a dormant period for a secondary cell group (SCG) during which the UE will not receive downlink (DL) data or control transmissions from the SCG; receive channel state information (CSI) measurements in a measurement report from the UE on an UL beam of a primary secondary cell (PSCELL) of the SCG during the dormant period for the SCG; and / or determine, during the dormant period and after transmitting the measurement report, one or more downlink (DL) beams to use for communicating with the UE on the SCG based on one or more rules and based on the measurement report, wherein the one or more rules cause the UE to determine the same one or more DL beams based on the measurement report.

[0020] In an additional aspect of the present disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes at least one processor and a memory coupled to the processor. The processor is configured to enter a dormant period for a secondary cell group (SCG) of a base station (BS), during which no downlink (DL) data or control transmission is received from the SCG; perform channel state information (CSI) measurements on the SCG during the dormant period to generate a measurement report; determine an uplink (UL) beam of a primary secondary cell (PSCELL) of the SCG; transmit the measurement report to the BS on the UL beam of the SCG; and / or during the dormant period and after transmitting the measurement report, determine one or more downlink (DL) beams for communication on the SCG based on one or more rules and based on the measurement report, wherein the one or more rules cause the BS to determine the same one or more DL beams based on the measurement report.

[0021] In an additional aspect of the present disclosure, a device configured for wireless communication is disclosed. The device includes at least one processor and a memory coupled to the processor. The processor is configured to instruct a user equipment (UE) to enter a dormant period for a secondary cell group (SCG), during which the UE does not receive downlink (DL) data or control transmissions from the SCG; receive channel state information (CSI) measurements in a measurement report from the UE on an UL beam of a primary secondary cell (PSCELL) of the SCG during the dormant period for the SCG; and / or during the dormant period and after transmitting the measurement report, determine one or more downlink (DL) beams for communicating with the UE on the SCG based on one or more rules and based on the measurement report, wherein the one or more rules cause the UE to determine the same one or more DL beams based on the measurement report.

[0022] In one aspect of the present disclosure, an apparatus for wireless communication may include a device for entering a dormant period for a secondary cell group (SCG) for a base station (BS), during which no downlink (DL) data or control transmission is received from the SCG; performing channel state information (CSI) measurements on the SCG to generate a measurement report during the dormant period; a device for determining an uplink (UL) beam of a primary secondary cell (PSCELL) of the SCG; a device for transmitting the measurement report to the BS on the UL beam of the SCG; and / or a device for determining one or more downlink (DL) beams for communication on the SCG based on one or more rules and based on the measurement report during the dormant period and after transmitting the measurement report, wherein the one or more rules cause the BS to determine the same one or more DL beams based on the measurement report.

[0023] In one aspect of the present disclosure, a device for wireless communication may include a device for instructing a user equipment (UE) to enter a dormant period for a secondary cell group (SCG), during which the UE will not receive downlink (DL) data or control transmissions from the SCG; a device for receiving channel state information (CSI) measurements in a measurement report from the UE on a UL beam of a primary secondary cell (PSCELL) of the SCG during the dormant period for the SCG; and / or a device for determining one or more downlink (DL) beams for communicating with the UE on the SCG based on one or more rules and based on the measurement report during the dormant period and after transmitting the measurement report, wherein the one or more rules cause the UE to determine the same one or more DL beams based on the measurement report.

[0024] The foregoing has broadly outlined the features and technical advantages of examples according to the present disclosure in an effort to make the following detailed description better understood. Additional features and advantages will be described hereinafter. The concepts and specific examples disclosed can be readily used as a basis for modifying or designing other structures for implementing the same purposes as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, as well as the associated advantages, will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the figures is provided for illustration and description purposes and does not define limitations on the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] A further understanding of the nature and advantages of the present disclosure may be obtained by referring to the following drawings. In the drawings, similar components or features may have the same reference numerals. In addition, components of the same type may be distinguished by following the reference numeral with a dash and a second reference numeral to distinguish between similar components. If only the first reference numeral is used in the specification, the description applies to any of the similar components having the same first reference numeral, regardless of the second reference numeral.

[0027] Figure 1 It is a block diagram illustrating the details of a wireless communication system.

[0028] Figure 2 is a block diagram illustrating a design of a base station and a UE configured according to one aspect of the present disclosure.

[0029] Figure 3 is a block diagram illustrating a wireless communication system including a base station that uses directional wireless beams.

[0030] Figure 4 is a block diagram illustrating a base station (BS) with a primary cell group (MSG) and a secondary cell group (SCG) according to one aspect of the present disclosure.

[0031] Figure 5 is a block diagram illustrating a base station (BS) with a primary cell group (MSG) and a secondary cell group (SCG) according to one aspect of the present disclosure.

[0032] Figure 6 is a flow chart illustrating a method of wireless communication by a user equipment (UE) during a secondary cell group (SCG) dormant period in accordance with some aspects of the present disclosure.

[0033] Figure 7 is a flow chart illustrating a method of wireless communication by a base station (BS) during a secondary cell group (SCG) dormant period in accordance with some aspects of the present disclosure.

[0034] Figure 8 is a call flow diagram illustrating a wireless communication method for updating a downlink (DL) beam during a secondary cell group (SCG) dormant period in accordance with some aspects of the present disclosure.

[0035] Figure 9 is a call flow diagram illustrating a wireless communication method for updating an uplink (UL) beam during a secondary cell group (SCG) dormant period in accordance with some aspects of the present disclosure.

[0036] Figure 10 is a block diagram illustrating a UE configured according to one aspect of the present disclosure.

[0037] Figure 11 is a block diagram illustrating an eNB configured according to one aspect of the present disclosure.

[0038] Detailed description

[0039] The detailed description set forth below in conjunction with the accompanying drawings is intended as a description of various configurations and is not intended to limit the scope of the present disclosure. Rather, this detailed description includes specific details in order to provide a thorough understanding of the subject matter of the present invention. It will be apparent to those skilled in the art that these specific details are not required in every case, and in some instances, well-known structures and components are shown in block diagram form for clarity of presentation.

[0040] The present disclosure generally relates to providing or participating in authorized shared access between two or more wireless communication systems (also referred to as wireless communication networks). In various embodiments, various techniques and devices (equipment) can be used for wireless communication networks, such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single carrier FDMA (SC-FDMA) networks, LTE networks, GSM networks, fifth generation (5G) or new radio (NR) networks, and other communication networks. As described herein, the terms "network" and "system" can be used interchangeably.

[0041] OFDMA networks can implement radio technologies such as Evolved UTRA (E-UTRA), IEEE 802.11, IEEE 802.16, IEEE802.20, flash-OFDM, etc. UTRA, E-UTRA, and Global System for Mobile Communications (GSM) are parts of the Universal Mobile Telecommunications System (UMTS). Specifically, Long Term Evolution (LTE) is a version of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS, and LTE are described in documents provided by an organization called the "3rd Generation Partnership Project" (3GPP), while cdma2000 is described in documents from an organization called the "3rd Generation Partnership Project 2" (3GPP2). These various radio technologies and standards are either known or under development. For example, the 3rd Generation Partnership Project (3GPP) is a collaboration between a group of telecommunications associations that aims to define globally applicable third generation (3G) mobile phone specifications. 3GPP Long Term Evolution (LTE) is a 3GPP project aimed at improving the Universal Mobile Telecommunications System (UMTS) mobile phone standard. 3GPP may define specifications for next generation mobile networks, mobile systems, and mobile devices. This disclosure focuses on the evolution of wireless technologies from LTE, 4G, 5G, NR, and beyond, with shared access to wireless spectrum between networks using a collection of new and different radio access technologies or radio air interfaces.

[0042] Specifically, 5G networks envision diverse deployments, diverse spectrum, and diverse services and devices that can be implemented using a unified air interface based on OFDM. To achieve these goals, in addition to developing new radio technologies for 5G NR networks, further enhancements to LTE and LTE-A are also being considered. 5G NR will be able to scale to provide coverage for: (1) networks with ultra-high density (e.g., approximately 1M nodes / km) 2(1) Massive Internet of Things (IoT) with ultra-low complexity (e.g., about tens of bits / second), ultra-low energy (e.g., about 10+ years of battery life), and deep coverage to reach challenging locations; (2) mission-critical control including strong security (to protect sensitive personal, financial, or confidential information), ultra-high reliability (e.g., about 99.9999% reliability), ultra-low latency (e.g., about 1 ms), and users with a wide range of mobility or lack of mobility; and (3) enhanced mobile broadband including very high capacity (e.g., about 10 Tbps / km 2 ), extreme data rates (e.g., multi-Gbps rates, 100+Mbps user experience rates), and deep cognition with advanced discovery and optimization.

[0043] 5G NR can be implemented to: use an optimized OFDM-based waveform with scalable parameter design and transmission time interval (TTI); have a common, flexible framework to use dynamic, low-latency time division duplex (TDD) / frequency division duplex (FDD) design to efficiently multiplex services and features; and have advanced wireless technologies such as massive multiple-input multiple-output (MIMO), robust millimeter wave (mmWave) transmission, advanced channel decoding and device-centric mobility. The scalability of parameter design in 5G NR (and the scaling of subcarrier spacing) can efficiently address the operation of diverse services across diverse spectrums and diverse deployments. For example, in various outdoor and macro coverage deployments implemented by less than 3 GHz FDD / TDD, subcarrier spacing can occur at 15 kHz on bandwidths such as 1, 5, 10, 20 MHz. For other various outdoor and small cell coverage deployments of TDD greater than 3 GHz, subcarrier spacing can occur at 30 kHz on 80 / 100 MHz bandwidth. For various other indoor broadband implementations, using TDD on the unlicensed portion of the 5 GHz band, subcarrier spacing can occur at 60 kHz over a 160 MHz bandwidth. Finally, for various deployments transmitting with the mmWave component under TDD at 28 GHz, subcarrier spacing can occur at 120 kHz over a 500 MHz bandwidth.

[0044] The scalable parameter design of 5G NR facilitates scalable TTI to meet diverse latency and quality of service (QoS) requirements. For example, shorter TTIs can be used for low latency and high reliability, while longer TTIs can be used for higher spectral efficiency. Efficient multiplexing of long TTIs and short TTIs allows transmission to start on symbol boundaries. 5G NR also envisions a self-contained integrated subframe design with uplink / downlink scheduling information, data, and acknowledgment in the same subframe. The self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, and supports adaptive uplink / downlink that can be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet current traffic needs.

[0045] Various other aspects and features of the present disclosure are further described below. It should be apparent that the teachings herein can be embodied in a variety of forms, and any specific structure, function, or both disclosed herein are representative and non-limiting. Based on the teachings herein, it will be appreciated by those of ordinary skill in the art that the aspects disclosed herein can be implemented independently of any other aspects and that two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement a device or practice a method. In addition, other structures, functionality, or structure and functionality that supplement or differ from one or more aspects set forth herein can be used to implement such a device or practice such a method. For example, the method can be implemented as a part of a system, device, apparatus, and / or as an instruction stored on a computer-readable medium for execution on a processor or computer. Not only that, an aspect can include at least one element of a claim.

[0046] Figure 1 1 is a block diagram illustrating a 5G network 100 including various base stations and UEs configured according to aspects of the present disclosure. 5G network 100 includes several base stations 105 and other network entities. A base station can be a station that communicates with a UE and may also be referred to as an evolved Node B (eNB), a next-generation eNB (gNB), an access point, etc. Each base station 105 can provide communication coverage for a specific geographic area. In 3GPP, the term "cell" can refer to such a specific geographic coverage area of ​​a base station and / or a base station subsystem serving that coverage area, depending on the context in which the term is used.

[0047] Base stations may provide communication coverage for macro cells or small cells (such as pico cells or femto cells), and / or other types of cells. Macro cells generally cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs that have a service subscription with a network provider. Small cells (such as pico cells) generally cover a relatively small geographic area and may allow unrestricted access by UEs that have a service subscription with a network provider. Small cells (such as femto cells) generally also cover a relatively small geographic area (e.g., a residence) and, in addition to unrestricted access, may also provide restricted access to UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in the residence, etc.). The base station of a macro cell may be referred to as a macro base station. The base station of a small cell may be referred to as a small cell base station, a pico base station, a femto base station, or a home base station. In Figure 1 In the example shown in FIG, base stations 105d and 105e are conventional macro base stations, while base stations 105a-105c are macro base stations enabled with one of 3D, Full Dimension (FD), or Massive MIMO. Base stations 105a-105c utilize their higher dimensional MIMO capabilities to utilize 3D beamforming in both elevation and azimuth beamforming to increase coverage and capacity. Base station 105f is a small cell base station, which can be a home node or a portable access point. The base station can support one or more (e.g., two, three, four, etc.) cells.

[0048] 5G network 100 may support synchronous or asynchronous operation. For synchronous operation, each base station may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, each base station may have different frame timing, and transmissions from different base stations may not be aligned in time.

[0049] UEs 115 are dispersed throughout the wireless network 100, and each UE may be stationary or mobile. UEs may also be referred to as terminals, mobile stations, subscriber units, stations, and the like. A UE may be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, and the like. In one aspect, a UE may be a device that includes a universal integrated circuit card (UICC). In another aspect, a UE may be a device that does not include a UICC. In some aspects, a UE that does not include a UICC may also be referred to as an Internet of Everything (IoE) or Internet of Things (IoT) device. UEs 115a-115d are examples of mobile smartphone-type devices that access the 5G network 100. UEs may also be machines specifically configured for connected communications, including machine-type communications (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT), and the like. UEs 115e-115k are examples of various machines configured for communications that access the 5G network 100. The UE may be able to communicate with any type of base station, whether macro, small cell, etc. Figure 1 In the present invention, lightning (e.g., communication link) indicates wireless transmission between the UE and the serving base station (the serving base station is a base station designated to serve the UE on the downlink and / or uplink), or expected transmission between base stations, and backhaul transmission between base stations.

[0050] In operation of the 5G network 100, base stations 105a-105c use 3D beamforming and coordinated spatial techniques (such as coordinated multipoint (CoMP) or multi-connectivity) to serve UEs 115a and 115b. Macro base station 105d performs backhaul communications with base stations 105a-105c and small cell base station 105f. Macro base station 105d also transmits multicast services that are subscribed to and received by UEs 115c and 115d. Such multicast services may include mobile TV or streaming video, or may include other services for providing community information (such as weather emergencies or warnings, such as Amber Alerts or Gray Alerts).

[0051] The 5G network 100 also supports mission-critical communications with ultra-reliable and redundant links for mission-critical devices, such as UE 115e, which is a drone. Redundant communication links with UE 115e include those from macro base stations 105d and 105e, as well as small cell base station 105f. Other machine-type devices, such as UE 115f (a thermometer), UE 115g (a smart meter), and UE 115h (a wearable device), can communicate directly with base stations (such as small cell base station 105f and macro base station 105e) over the 5G network 100, or in a multi-hop configuration by communicating with another user device that relays its information to the network (such as UE 115f communicating temperature measurement information to smart meter UE 115g, which is then reported to the network via small cell base station 105f). The 5G network 100 may also provide additional network efficiency through dynamic, low-latency TDD / FDD communications, such as in a vehicle-to-vehicle (V2V) mesh network between UEs 115i-115k communicating with a macro base station 105e.

[0052] Figure 2 A block diagram shows a design of a base station 105 and a UE 115, which may be Figure 1 One of each base station and one of each UE in the base station 105. At base station 105, transmit processor 220 may receive data from data source 212 and control information from controller / processor 240. The control information may be for PBCH, PCFICH, PHICH, PDCCH, EPDCCH, MPDCCH, etc. Data may be for PDSCH, etc. Transmit processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. Transmit processor 220 may also generate reference symbols (e.g., for PSS, SSS, and cell-specific reference signals). Transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, and / or reference symbols, as applicable, and may provide output symbol streams to modulators (MODs) 232a through 232t. Each modulator 232 may process its respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (eg, convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The downlink signals from modulators 232a through 232t may be transmitted via antennas 234a through 234t, respectively.

[0053] At UE 115, antennas 252a through 252r may receive downlink signals from base station 105 and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may receive received symbols from all demodulators 254a through 254r, perform MIMO detection on the received symbols where applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 115 to a data sink 260, and provide decoded control information to a controller / processor 280.

[0054] On the uplink, at the UE 115, a transmit processor 264 may receive and process data (e.g., for the PUSCH) from a data source 262 and control information (e.g., for the PUCCH) from the controller / processor 280. The transmit processor 264 may also generate reference symbols for a reference signal. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, if applicable, further processed by modulators 254a through 254r (e.g., for SC-FDM, etc.), and transmitted to the base station 105. At the base station 105, the uplink signal from the UE 115 may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236, if applicable, and further processed by the receive processor 238 to obtain decoded data and control information sent by the UE 115. The processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller / processor 240.

[0055] The controller / processors 240 and 280 may direct the operation at the base station 105 and the UE 115, respectively. The controller / processor 240 and / or other processors and modules at the base station 105 may perform or direct the execution of various processes for the techniques described herein. The controller / processor 280 and / or other processors and modules at the UE 115 may also perform or direct the execution of various processes for the techniques described herein. Figure 6-9 1 and / or other processes for the techniques described herein. Memories 242 and 282 may store data and program codes for base station 105 and UE 115, respectively. Scheduler 244 may schedule UEs for data transmission on the downlink and / or uplink.

[0056] Wireless communication systems operated by different network operating entities (e.g., network operators) can share spectrum. In some instances, one network operating entity can be configured to use the entire designated shared spectrum for at least one period of time, followed by another network operating entity using the entire designated shared spectrum for a different period of time. Thus, to allow network operating entities to use the entire designated shared spectrum and to mitigate interfering communications between different network operating entities, specific resources (e.g., time) can be partitioned and allocated to different network operating entities for specific types of communications.

[0057] For example, a network operating entity may be allocated specific time resources that are reserved for exclusive communication using the entire shared spectrum. Other time resources may also be allocated to a network operating entity where it is prioritized over other network operating entities for communication using the shared spectrum. These time resources prioritized for use by the network operating entity may be utilized on an opportunistic basis by other network operating entities if the prioritized network operating entity does not utilize these resources. Additional time resources may be allocated to any network operator for opportunistic use.

[0058] Access to shared spectrum and arbitration of time resources among different network operating entities may be centrally controlled by a single entity, autonomously determined through a predefined arbitration scheme, or dynamically determined based on interactions between wireless nodes of the network operator.

[0059] In some cases, the UE 115 and the base station 105 of the 5g network 100 (in Figure 1 The UE 115 or base station 105 may operate in a shared radio frequency spectrum band, which may include licensed or unlicensed (e.g., contention-based) spectrum. In the unlicensed frequency portion of the shared radio frequency spectrum band, the UE 115 or base station 105 may traditionally perform medium sensing procedures to contend for access to the spectrum. For example, the UE 115 or base station 105 may perform a listen-before-talk (LBT) procedure (such as a clear channel assessment (CCA)) before communicating to determine whether the shared channel is available. CCA may include energy detection procedures to determine whether there are any other active transmissions. For example, the device may infer that a change in the received signal strength indicator (RSSI) of the power meter indicates that the channel is occupied. Specifically, the signal power concentrated in a particular bandwidth and exceeding a predetermined noise floor may indicate another wireless transmitter. CCA may also include detection of a particular sequence that indicates channel usage. For example, another device may transmit a particular preamble before transmitting a data sequence. In some cases, the LBT procedure may include a wireless node acting as a proxy for collisions to adjust its own backoff window based on the amount of energy detected on the channel and / or acknowledgment / negative acknowledgment (ACK / NACK) feedback for its own transmitted packets.

[0060] Generally speaking, four categories of LBT procedures have been proposed for sensing a shared channel to look for signals indicating that the channel is occupied. In the first category (CAT 1 LBT), LBT or CCa is not applied to detect occupancy of the shared channel. The second category (CAT 2 LBT) (which may also be referred to as abbreviated LBT, single-shot LBT, or 25-μs LBT) provides for a node to perform CCA to detect energy above a predetermined threshold or to detect a message or preamble occupying the shared channel. CAT 2 LBT performs CCA without using a random backoff operation, resulting in a shortened length relative to subsequent categories.

[0061] The third category (CAT 3LBT) performs CCA to detect energy or messages on the shared channel, but also uses random backoff and a fixed contention window. Therefore, when a node initiates CAT 3LBT, it performs a first CCA to detect occupancy of the shared channel. If the shared channel is idle for the duration of the first CCA, the node may proceed to transmit. However, if the first CCA detects a signal occupying the shared channel, the node selects a random backoff based on the fixed contention window size and performs an extended CCA. If the shared channel is detected to be idle during the extended CCA and the random number has been reduced to 0, the node may start transmitting on the shared channel. Otherwise, the node reduces the random number and performs another extended CCA. The node may continue to perform extended CCAs until the random number reaches 0. If the random number reaches 0 without any extended CCA detecting channel occupancy, the node may transmit on the shared channel. If, at any extended CCA, the node detects channel occupancy, the node may reselect a new random backoff based on the fixed contention window size to start the countdown again.

[0062] The fourth category (CAT 4 LBT) (which may be referred to as a full LBT procedure) uses random backoff and a variable contention window size to perform CCA with energy and message detection. The sequence of CCA detection is similar to the process of CAT 3 LBT, except that the contention window size is variable for the CAT 4 LBT procedure.

[0063] Using medium sensing procedures to contend for access to unlicensed shared spectrum may result in communication inefficiencies. This may be particularly evident when multiple network operating entities (e.g., network operators) are trying to access shared resources. In the 5G network 100, the base station 105 and the UE 115 may be operated by the same or different network operating entities. In some examples, an individual base station 105 or UE 115 may be operated by more than one network operating entity. In other examples, each base station 105 and UE 115 may be operated by a single network operating entity. Requiring each base station 105 and UE 115 of a different network operating entity to contend for shared resources may result in increased signaling overhead and communication latency.

[0064] Figure 3 An example of a timing diagram 300 for coordinated resource partitioning is illustrated. The timing diagram 300 includes a superframe 305, which may represent a fixed time duration (e.g., 20 ms). The superframe 305 may repeat for a given communication session and may be used by a wireless system (such as a reference system). Figure 1 1 . The superframe 305 may be divided into intervals, such as an acquisition interval (A-INT) 310 and an arbitration interval 315. As described in more detail below, the A-INT 310 and the arbitration interval 315 may be subdivided into subintervals that are designated for specific resource types and allocated to different network operating entities to facilitate coordinated communication between the different network operating entities. For example, the arbitration interval 315 may be divided into a plurality of subintervals 320. Moreover, the superframe 305 may be further divided into a plurality of subframes 325 having a fixed duration (e.g., 1 ms). Although the timing diagram 300 illustrates three different network operating entities (e.g., Operator A, Operator B, Operator C), the number of network operating entities that use the superframe 305 for coordinated communication may be greater or less than the number illustrated in the timing diagram 300.

[0065] A-INT 310 may be a dedicated interval of superframe 305 reserved for exclusive communication by network operating entities. In some examples, each network operating entity may be allocated specific resources within A-INT 310 for exclusive communication. For example, resource 330-a may be reserved for exclusive communication by operator A (such as via base station 105a), resource 330-b may be reserved for exclusive communication by operator B (such as via base station 105b), and resource 330-c may be reserved for exclusive communication by operator C (such as via base station 105c). Because resource 330-a is reserved for exclusive communication by operator A, neither operator B nor operator C can communicate during resource 330-a, even if operator A chooses not to communicate during those resources. That is, access to the exclusive resources is limited to the designated network operator. Similar restrictions apply to operator B's resources 330-b and operator C's resources 330-c. Each wireless node of operator A (eg, UE 115 or base station 105) may communicate any desired information (such as control information or data) during its exclusive resource 330-a.

[0066] When communicating on exclusive resources, the network operating entity does not need to perform any medium sensing procedures (e.g., listen before talk (LBT) or clear channel assessment (CCA)) because the network operating entity is aware that these resources are reserved. Because only designated network operating entities can communicate on exclusive resources, the possibility of interfering communications can be reduced compared to relying solely on medium sensing techniques (e.g., no hidden node problem). In some examples, A-INT 310 is used to transmit control information, such as synchronization signals (e.g., SYNC signals), system information (e.g., system information blocks (SIBs)), paging information (e.g., physical broadcast channel (PBCH) messages), or random access information (e.g., random access channel (RACH) signals). In some examples, all wireless nodes associated with the network operating entity can transmit simultaneously during their exclusive resources.

[0067] In some examples, resources may be classified as being prioritized for a particular network operation entity. Resources assigned as being prioritized for a particular network operation entity may be referred to as a guaranteed interval (G-INT) for that network operation entity. The resource interval used by a network operation entity during a G-INT may be referred to as a prioritized subinterval. For example, resource 335-a may be prioritized for use by operator A and may therefore be referred to as operator A's G-INT (e.g., G-INT-OpA). Similarly, resource 335-b may be prioritized for operator B (e.g., G-INT-OpB), resource 335-c (e.g., G-INT-OpC) may be prioritized for operator C, resource 335-d may be prioritized for operator A, resource 335-e may be prioritized for operator B, and resource 335-f may be prioritized for operator C.

[0068] Figure 3 305. The various G-INT resources illustrated in FIG305 appear to be staggered to illustrate the association of these resources with their respective network operating entities, but these resources can all be on the same frequency bandwidth. Thus, if viewed along the time-frequency grid, the G-INT resources can appear as adjacent lines within the superframe 305. This partitioning of data can be an example of time division multiplexing (TDM). Moreover, when resources appear in the same subinterval (e.g., resource 340-a and resource 335-b), these resources represent the same time resources relative to the superframe 305 (e.g., these resources occupy the same subinterval 320), but these resources are designated separately to illustrate that the same time resources can be classified differently for different operators.

[0069] When resources are assigned to a particular network operation entity (e.g., G-INT) for priority, that network operation entity can use those resources for communication without having to wait for or perform any medium sensing procedures (e.g., LBT or CCA). For example, the wireless node of operator A can freely communicate any data or control information during resource 335-a without interference from the wireless nodes of operator B or operator C.

[0070] A network operating entity may additionally signal to another operator that it intends to use a particular G-INT. For example, referring to resource 335-a, operator A may signal to operators B and C that it intends to use resource 335-a. This type of signaling may be referred to as an activity indication. Furthermore, because operator A has priority with respect to resource 335-a, operator A may be considered a higher priority operator than both operators B and C. However, as discussed above, operator A does not need to signal to other network operating entities to ensure interference-free transmission during resource 335-a, as resource 335-a is preferentially assigned to operator A.

[0071] Similarly, a network operating entity can signal to another network operating entity that it intends not to use a particular G-INT. This signaling can also be referred to as an activity indication. For example, referring to resource 335-b, operator B can signal to operators A and C that it intends not to use resource 335-b for communication, even if these resources are preferentially assigned to operator B. With respect to resource 335-b, operator B can be considered a higher priority network operating entity than operators A and C. In such a scenario, operators A and C can attempt to use the resources of subinterval 320 on an opportunistic basis. Thus, from the perspective of operator A, subinterval 320 containing resource 335-b can be considered an opportunistic interval (O-INT) for operator A (e.g., O-INT-OpA). For illustrative purposes, resource 340-a can represent an O-INT for operator A. Furthermore, from the perspective of operator C, the same subinterval 320 can represent an O-INT for operator C with corresponding resource 340-b. Resources 340-a, 335-b, and 340-b all represent the same time resource (e.g., a particular subinterval 320), but are identified separately to indicate that the same resource may be considered G-INT for some network operating entities and still O-INT for other network operating entities.

[0072] To utilize resources on an opportunistic basis, Operator A and Operator C may perform medium sensing procedures to check for communications on a particular channel before transmitting data. For example, if Operator B decides not to use resources 335-b (e.g., G-INT-OpB), Operator A may use those same resources (e.g., represented by resource 340-a) by first checking the channel for interference (e.g., LBT) and then transmitting data if the channel is determined to be clear. Similarly, if Operator C desires to access resources on an opportunistic basis during subinterval 320 (e.g., using O-INT represented by resource 340-b) in response to Operator B's indication that it will not use its G-INT (e.g., resource 335-b), Operator C may perform medium sensing procedures and access those resources if available. In some cases, two operators (e.g., Operator A and Operator C) may attempt to access the same resources, in which case the two operators may employ contention-based procedures to avoid interfering communications. Operators may also have sub-priorities assigned to them that are designed to determine which operator can gain access to a resource if more than one operator is attempting access simultaneously. For example, when operator B is not using resource 335-b (e.g., G-INT-OpB), operator A may have a higher priority than operator C during sub-interval 320. Note that in another sub-interval (not shown), when operator B is not using its G-INT, operator C may have a higher priority than operator A.

[0073] In some examples, a network operation entity may intend not to use a specific G-INT assigned to it, but may not send an outward activity indication conveying the intention not to use the resource. In such a case, for a particular subinterval 320, a lower-priority operation entity may be configured to monitor the channel to determine whether a higher-priority operation entity is using the resource. If the lower-priority operation entity determines, through LBT or a similar method, that the higher-priority operation entity will not use its G-INT resources, the lower-priority operation entity may attempt to access these resources on an opportunistic basis, as described above.

[0074] In some examples, access to G-INT or O-INT may be preceded by a reservation signal (e.g., request to send (RTS) / clear to send (CTS)) and the contention window (CW) may be randomly selected between one operating entity and the entire number of operating entities.

[0075] In some examples, the operation entity may employ or be compatible with coordinated multipoint (CoMP) communications. For example, the operation entity may employ CoMP and dynamic time division duplexing (TDD) in G-INT and opportunistic CoMP in O-INT as needed.

[0076] exist Figure 3 In the example illustrated in , each sub-interval 320 includes G-INT for one of operators A, B, or C. However, in some cases, one or more sub-intervals 320 may include resources that are neither reserved for exclusive use nor reserved for prioritized use (e.g., unassigned resources). Such unassigned resources may be considered O-INT for any network operating entity and may be accessed on an opportunistic basis, as described above.

[0077] In some examples, each subframe 325 may contain 14 symbols (e.g., 250-μs for a 60 kHz tone spacing). These subframes 325 may be stand-alone, self-contained intervals C (ITCs), or the subframes 325 may be part of a long ITC. An ITC may be a self-contained transmission that begins with a downlink transmission and ends with an uplink transmission. In some embodiments, an ITC may contain one or more subframes 325 that operate contiguously while the medium is occupied. In some cases, assuming a 250-μs transmission opportunity, there may be up to eight network operators in an A-INT 310 (e.g., having a duration of 2 ms).

[0078] although Figure 3 Three operators are illustrated in the superframe 305, but it should be understood that fewer or more network operating entities can be configured to operate in a coordinated manner as described above. In some cases, the position of each operator's G-INT, O-INT, or A-INT within the superframe 305 is determined autonomously based on the number of network operating entities active in the system. For example, if there is only one network operating entity, each subinterval 320 may be occupied by a G-INT for that single network operating entity, or the subinterval 320 may alternate between a G-INT and an O-INT for that network operating entity to allow other network operating entities to enter. If there are two network operating entities, the subinterval 320 may alternate between a G-INT for the first network operating entity and a G-INT for the second network operating entity. If there are three network operating entities, the G-INT and O-INT for each network operating entity may be as follows: Figure 3. If there are four network operating entities, the first four sub-intervals 320 may include coherent G-INT for these four network operating entities, while the remaining two sub-intervals 320 may contain O-INT. Similarly, if there are five network operating entities, the first five sub-intervals 320 may include coherent G-INT for these five network operating entities, while the remaining sub-intervals 320 may contain O-INT. If there are six network operating entities, all six sub-intervals 320 may include coherent G-INT for each network operating entity. It should be understood that these examples are for illustrative purposes only, and other autonomously determined interval allocations may also be used.

[0079] It should be understood that reference Figure 3 The coordination framework described is for illustrative purposes only. For example, the duration of superframe 305 can be more or less than 20 ms. Furthermore, the number, duration, and location of subintervals 320 and subframes 325 can vary from the illustrated configuration. Furthermore, the type of resource designation (e.g., exclusive, prioritized, unassigned) can vary or include more or fewer sub-designations.

[0080] A base station (BS) operating according to aspects of the present disclosure may be configured to include several cells that may communicate with user equipment (UE), and those cells may be organized into a master cell group (MCG) and a secondary cell group (SCG). Figure 4 1 is a block diagram illustrating a base station (BS) having a primary cell group (MSG) and a secondary cell group (SCG) according to one aspect of the present disclosure. The base station may include a primary cell group (MCG) 410 under the control of a master node (MN) and a secondary cell group (SCG) 420 under the control of a secondary node (SN). MCG 410 includes a primary cell (PCELL) 412, and SCG 422 includes a primary secondary cell (PSCELL) 422. Each of cell groups 410 and 420 may include one or more secondary cells (SCELLs) 414a-414n and 424a-424n, respectively. The number of SCELLs in groups 410 and 420 need not be equal. Figure 4 The groups 410 and 420 in the example network are operating on different frequency bands, and each cell within the groups 410 and 420 is on the same frequency band. For example, the MCG 410 includes a PCELL 412 and several SCELLs 414a-n operating in the FR1 frequency band, and the SCG 420 includes a PSCELL 422 and SCELLs 424a-n operating in the FR2 frequency band. Other frequency band configurations are also possible, and Figure 5 Another example frequency band configuration is shown in FIG.

[0081] Figure 51 is a block diagram illustrating a base station (BS) having a primary cell group (MSG) and a secondary cell group (SCG) according to one aspect of the present disclosure. The base station may include a primary cell group (MCG) 510 under the control of a master node (MN) and a secondary cell group (SCG) 520 under the control of a secondary node (SN). The MCG 510 includes a primary cell (PCELL) 512, and the SCG 522 includes a primary secondary cell (PSCELL) 522. Each of the communication groups 510 and 520 may include one or more secondary cells (SCELLs) 514a-414n and 524a-424n. The number of SCELLs in the groups 510 and 520 need not be equal. Figure 5 In the example network of FIG, groups 510 and 520 have cells operating on different frequency bands. For example, MCG 510 includes a PCELL 512 and several SCELLs 514a-n operating in the LTE band, and SCG 520 includes a PSCELL 522 operating in the FR1 band and SCELLs 524a-n operating in the FR2 band.

[0082] Figure 4 and Figure 5 Each of the example BS configurations is a multi-radio / radio access technology (RAT) dual connectivity configuration. That is, these BSs can communicate with the UE on multiple RATs selected from LTE, FR1, FR2 or other 2G, 3G or 5G RATs. Communicating on multiple RATs consumes additional resources on the UE than communicating on only one of these RATs. For example, the UE may consume additional power and processing resources to simultaneously maintain communication availability on each RAT. The UE may benefit from reducing communications on some of the RATs to reduce power consumption and processing resources. For example, referring to the above Figure 4-5In a network that uses a wireless LAN as the base station, the UE can transfer to a dormant period on a secondary cell group (SCG) during which communication operations are reduced. During the dormant period, the link between the UE and the SCG is maintained to allow operations to be quickly resumed with low latency on the SCG based on the communication needs of the UE or the BS. The reduced communication operations during the dormant period may involve an autonomous beam determination process during the dormant period. When the beam state in the SCG changes during the dormant period, the UE and the BS may autonomously transfer from one beam to another without the need to communicate the beam change from the BS to the UE. This autonomous beam determination may allow the UE to operate during the dormant period without any downlink (DL) transmission from the SCG. When the dormant period is over, the UE and the BS will have the same beam determined for communication. Resuming operations on the SCG with low latency when exiting the dormant period is possible because the UE and the BS have autonomously determined the same beam for operation during the dormant period. Power consumption is reduced during the dormant period because the UE is reducing communication operations, such as by not receiving DL transmissions from the SCG.

[0083] In addition to beam determination, other operations performed autonomously during the dormant period may include radio resource monitoring (RRM), radio link monitoring (RLM), beam failure detection (BFD), beam failure recovery (BFR), L1 measurement, L1 measurement reporting, and sounding procedures. For example, RLM and BFD may be used for radio link failure (RLF) monitoring and beam failure detection (BFD), where RLM and BFD are only performed on the PSCELLs of the dormant SCG. BFD may also be configured for SCELLs in the SCG, such as for similar Figure 5 . For a dormant SCG, RLM can be used to detect a PSCELL radio link failure, and BFD in the PSCELL can detect a beam failure. Further, BFD for the SCELL can detect a beam failure on the SCELL. If a beam failure is detected, a beam failure report can be conveyed to the SN by sending a beam failure report via a random access channel (RACH) to the SN via the PSCELL. After BFD on the PSCELL or SCELL and a beam failure report on the RACH, the SN can instruct the UE during RACH communication whether to perform beam failure recovery (BFR) on the SCG.

[0084] In some aspects of the present disclosure, beam determination within an SCG may be determined based on L1 measurements or sounding procedures. L1 measurements may be performed only on the PSCELL or on the PSCELL and one or more SCELLs. The L1 reference signals used for measurement may include periodic / semi-periodic / aperiodic CSI-RS, periodic / aperiodic SRS measurements, BFD-RS, or aperiodic tracking reference signal (TRS). L1 measurements may be performed and reported to the PSCELL, including L1 measurement reports for the PSCELL and SCELL transmitted to the secondary node (SN) using physical uplink control channel (PUCCH) resources or sounding reference signal (SRS) transmissions to the SN. In some aspects, PUCCH and SRS transmissions may be multiplexed, such as to improve the efficiency of UL transmissions.

[0085] Conventionally, beam updates will be determined from L1 measurements provided by the UE to the SN, and the instruction to update the beam is transmitted from the SN to the UE on the Physical Downlink Control Channel (PDCCH) or the Physical Downlink Shared Channel (PDSCH). However, if downlink (DL) transmissions are disabled during SCG dormancy, the SN cannot instruct a beam update. If DL transmissions are not available for beam updates, a rule-based autonomous procedure can be used to update the beams on the UE and BS without the need for explicit beam update messages from the BS to the UE. The rule-based autonomous procedure can also be used when DL transmissions are enabled, such as to improve resource utilization within the SCG. According to some aspects, a designated dormant DL / UL bandwidth portion (BWP) that is different from the BWP used by other SCELLs can be used by the PSCELL to improve PDCCH / PUCCH performance.

[0086] Figure 6 This is a flow chart illustrating a method for wireless communication by a user equipment (UE) during a secondary cell group (SCG) dormancy period according to some aspects of the present disclosure. At block 600, the UE may enter a dormancy period for a secondary cell group (SCG). In some aspects, no downlink transmissions may be received from the SCG during the dormancy period. In some aspects, other operations during the dormancy period may be adjusted to reduce power consumption or processing resources without terminating downlink transmissions.

[0087] In block 601, the UE may perform L1 measurements on the SCG during a sleep period to generate a measurement report. In some aspects, the UE may perform measurements on the PSCELL and SCELLs in the SCG. For example, when the PSCELL and SCELL are on different frequency bands, such as Figure 5As shown in the example system of , separate measurements can be performed on different PSCELLs and SCELLs in different frequency bands. In some aspects, the UE can perform measurements on a PSCELL and use these measurements as a representative of the SCELLs in the same SCG as the PSCELL. For example, when the PSCELL and SCELL are on the same frequency band (e.g. Figure 4 ), the measurement on the PSCELL can accurately represent the link quality of the SCELLs on the same frequency band.

[0088] At block 602, the UE may transmit a measurement report on an uplink (UL) beam of an SCG to a secondary node (SN) of the SCG.

[0089] In block 603, the UE may determine one or more downlink (DL) beams for communication on the SCG based on the measurement reports received in block 602. The DL beams may be determined based on a set of rules established at the UE. In some aspects, the set of rules may be predetermined on the UE and the BS. In some aspects, the BS may determine rules for autonomous beam determination and communicate these rules to the UE for application during the sleep period. In some aspects, the BS and the UE may negotiate the rules before entering the sleep period. The rules on the UE and the BS may be synchronized so that each of the UE and the BS derives the same determined one or more beams for the same set of measurement reports. These rules may specify how to determine the one or more DL beams from the available beams in the SCG. According to some aspects, these rules may provide for selecting the beam with the highest signal-to-noise ratio (SNR). The measurement reports allow the UE and the BS to determine new beams for communication when conditions change during the sleep period to reduce the possibility of beam failure. The UE and the BS will communicate on the same one or more beams upon exiting the sleep period without requiring explicit signaling between the UE and the BS upon exiting the sleep period.

[0090] At block 604, the UE may change the transmission code point (TCI) state on the UE to the one or more DL beams determined at block 603. This change of activation state may be performed autonomously without explicit instructions received from the BS.

[0091] Blocks 601, 602, 603, and 604 may be performed multiple times during the sleep period entered at block 600. In some aspects, blocks 601, 602, 603, and 604 may be performed at periodic or aperiodic intervals. In some aspects, blocks 601, 602, 603, and 604 may be performed in a different order. For example, in some aspects, blocks 601 and 602 may be performed multiple times to obtain multiple measurement reports for each determination of a DL beam at block 603.

[0092] The dormant period may end at the instruction of the BS or under predetermined conditions. For example, the BS may transmit an instruction to exit the dormant period and enter the active period. The UE may then communicate with the BS via one or more beams activated in block 604 as determined in block 603.

[0093] The BS may perform a method similar to that of the UE for autonomously determining one or more beams so that the BS and the UE are synchronized in beam determination. Figure 7 is a flow chart illustrating a method of wireless communication by a base station (BS) during a secondary cell group (SCG) dormant period in accordance with some aspects of the present disclosure.

[0094] The BS may instruct a user equipment (UE) to enter a secondary cell group (SCG) sleep period at block 700. The sleep period may be instructed, for example, based on a report from the UE that the UE is overheating or based on reduced data demand of the UE.

[0095] At block 701, the BS may receive measurement reports from the UE during an SCG dormant period. These measurement reports may include any of those described with reference to blocks 601 and 602 or other measurement reports.

[0096] In block 702, the BS may determine one or more downlink (DL) beams for communication on the SCG using the same set of rules as the UE at the measurement report received in block 701. By using the same set of rules as the UE at blocks 702 and 603, the UE and the BS may be synchronized in beam determination so that both the UE and the BS determine the same beam for communication during subsequent active periods for the SCG. In some aspects, this synchronization is achieved without explicit signaling from the BS to the UE.

[0097] At block 703, the BS may instruct the UE to enter an active period for the SCG. The active period may be instructed based on, for example, increased data demand of the UE.

[0098] At block 704 , the BS may communicate with the UE on the determined one or more DL beams of the SCG during the active period initiated at block 703 .

[0099] Figure 8 An example of communication between a UE and a BS according to aspects of the present disclosure is shown in FIG. Figure 88 is a call flow diagram illustrating a wireless communication method for updating a downlink (DL) beam during a secondary cell group (SCG) dormancy period according to some aspects of the present disclosure. A UE 802 may communicate with a base station (BS), including a master node (MN) 804 and a secondary node (SN) 806. The UE 802 may enter an SCG dormancy state at block 810. During the dormancy period, the UE 802 may use a monitoring window for a PSCELL and / or SCELL at call 812c. During the monitoring period, the UE 802 may monitor P-CSI-RS and / or SSB signals from the SN 806 at call 812a. Subsequently, the UE 802 may provide a measurement report on the PUCCH and / or SRS at call 812b. The SN 806 may determine the best downlink (DL) beam at block 814 and change the UE transmission code point (TCI) state to the best DL beam determined at block 816. At block 818, the UE may correspondingly change its TCI state to the same best DL beam. In some aspects, the transmission code point (TCI) state changes at blocks 816 and 818 are performed without explicit signaling between the UE 802 and the SN 806 indicating the best beam. If the dormant state remains active, the UE 802 uses the P-CSI-RS and / or SSB signals received at call 820a to perform further monitoring at call 818 to generate measurement reports, which are transmitted to the SN 806 at call 820b.

[0100] In some aspects, the UE may also autonomously update the uplink beam used by the UE to transmit measurement reports. Figure 9This is a call flow diagram illustrating a wireless communication method for updating uplink (UL) beams during a secondary cell group (SCG) dormancy period according to some aspects of the present disclosure. A UE 902 may communicate with a base station (BS) including a mobile station (MN) 904 and a network station (SN) 906. The UE 902 may enter a dormancy period for the SCG at block 910. The UE 920 may monitor the PSCELL and / or SCELL using the P-CSI-RS and / or SSB transmitted from the SN 906 during call 912 during call 910. The UE 902 may determine one or more optimal DL beams from measurements made during call 914 of signals transmitted during call 912 at block 916. A number (m) of these optimal DL beams may be selected from the DL beams, and a measurement report may be transmitted to the SN 906 on the UL beams corresponding to the m DL beams. The measurement report may be transmitted on UL beams 1-m during calls 918a-m. According to some aspects, the same measurement report may be transmitted on each of UL beams 1-m at calls 918a-m. SN 906 may determine the best UL beam for the current conditions in the cell environment surrounding UE 902 at block 920. SN 906 may transmit reference signals, such as P-CSI-RS and / or SSB, at call 922. UE 902 may then monitor the reference signals by performing L1 measurements to generate measurement reports at block 924 and transmit these measurement reports on the PUCCH at call 926.

[0101] In accordance with some aspects, the UE may select an UL PUCCH / SRS beam for transmitting a report to follow the determined best DL beam. For example, the UE 902 may use the beam associated with the best two or three highest L1-reference signal received power (RSRP) to perform beam sweeping during PUCCH and / or SRS transmission so that multiple copies of the PUCCH and / or SRS are transmitted using the best two or three beams. In accordance with some aspects, the UE 902 may select an UL beam to follow the DL beam. For example, the UE 902 may use the beam associated with the best two highest L1-RSRP to send PUCCH and / or SRS. In accordance with some aspects, the UE 902 may use the UL beam that follows the CORESET with the lowest ID. The CORESET may be used when there is no or little beam correspondence between the DL and UL beams.

[0102] According to some aspects of the present disclosure, a UE operating in an EN-DC inter-band CA wireless communication system may perform radio link monitoring (RLM) and beam failure detection (BFD) on a PSCELL and SCELL of an SCG, wherein beam failure reporting is made to the PSCELL via the RACH. In some aspects of these aspects of the present disclosure, beam determination may be made autonomously based on L1 measurement reports for the PSCELL and SCELL made by monitoring CSI-RS signals received on the PSCELL and SCELL, and the L1 measurement reports may be transmitted using the PUCCH on the PSCELL and / or the SRS on the PSCELL.

[0103] According to some aspects of the present disclosure, a UE operating in an NR-DC inter-band CA wireless communication system may perform radio link monitoring (RLM) and beam failure detection (BFD) on a PSCELL of an SCG, wherein beam failure reporting is made to the PSCELL via a RACH. In some aspects of these aspects of the present disclosure, beam determination may be made autonomously based on an L1 measurement report for the PSCELL made by monitoring a CSI-RS signal received from the PSCELL, wherein the L1 measurement report may be transmitted using a PUCCH on the PSCELL and / or an SRS on the PSCELL.

[0104] Those skilled in the art will appreciate that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0105] Figure 6 、 7 The functional blocks and modules in , 8 or 9 may include processors, electronic devices, hardware devices, electronic components, logical circuits, memories, software codes, firmware codes, etc., or any combination thereof.

[0106] Figure 6-7 and Figure 8-9 1 is a block diagram illustrating example blocks that are executed to implement one aspect of the present disclosure. Figure 10 The description is based on the UE 115 illustrated in FIG. Figure 10 is a block diagram illustrating a UE 115 configured according to one aspect of the present disclosure. The UE 115 includes Figure 21. For example, the UE 115 includes a controller / processor 280 that operates to execute logic or computer instructions stored in a memory 282 and to control the various components of the UE 115 that provide the features and functionality of the UE 115. The UE 115 transmits and receives signals via wireless radios 1000a-r and antennas 252a-r under the control of the controller / processor 280. The wireless radios 1000a-r include various components and hardware, such as those described in Figure 2 15, including modulators / demodulators 254a-r, a MIMO detector 256, a receive processor 258, a transmit processor 264, and a TX MIMO processor 266. The processor 280 may include means 1002 for performing measurements in the wireless communication system and means 1003 for autonomously determining beams based on rules using information from measurement reports.

[0107] Figure 6-7 and Figure 8-9 1 is a block diagram illustrating example blocks that are executed to implement one aspect of the present disclosure. Figure 11 The description is based on the eNB 105 illustrated in FIG. Figure 11 is a block diagram illustrating an eNB 105 configured according to one aspect of the present disclosure. The eNB 105 includes Figure 2 For example, the eNB 105 includes a controller / processor 240 that operates to execute logic or computer instructions stored in a memory 242 and to control the components of the eNB 105 that provide the features and functionality of the eNB 105. Under the control of the controller / processor 240, the eNB 105 transmits and receives signals via wireless radios 1100a-t and antennas 234a-t. The wireless radio 1100a includes various components and hardware, as shown in FIG. Figure 2 105, includes modulators / demodulators 232a-t, a MIMO detector 236, a receive processor 238, a transmit processor 220, and a TX MIMO processor 230. The controller / processor 240 may include means 1101 for processing measurement reports received from UEs and means 1102 for autonomously determining beams based on rules using information from the measurement reports.

[0108] The skilled person will further appreciate that the various illustrative logic blocks, modules, circuits, and algorithmic steps described in conjunction with the disclosure herein can be implemented as electronic hardware, computer software, or a combination of the two. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above in the form of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. The skilled person can implement the described functionality in different ways for each specific application, but such implementation decisions should not be interpreted as causing departure from the scope of the present disclosure. The skilled person will also readily appreciate that the components, methods, or interactive order or combination described herein are merely examples and the components, methods, or interactions of various aspects of the present disclosure can be combined or performed in a manner different from those illustrated and described herein.

[0109] The various illustrative logical blocks, modules, and circuits described in connection with the disclosure herein may be implemented or performed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0110] The steps of the method or algorithm described in conjunction with the disclosure herein may be implemented directly in hardware, in a software module executed by a processor, or in a combination of the two. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read and write information from / to the storage medium. In an alternative, the storage medium may be integrated into the processor. The processor and storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In an alternative, the processor and storage medium may reside in a user terminal as discrete components.

[0111] In one or more exemplary designs, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, each function may be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Computer-readable media include both computer storage media and communication media, including any media that facilitates the transfer of a computer program from one location to another. A computer-readable storage medium may be any available medium that can be accessed by a general-purpose or special-purpose computer. By way of example and not limitation, such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code means in the form of instructions or data structures and can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Furthermore, a connection may also be appropriately referred to as a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL), then the coaxial cable, fiber optic cable, twisted pair, or DSL is included in the definition of medium. As used herein, disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0112] As used herein, including in the claims, the term "and" and "or" used in a list of two or more items means that any one of the listed items may be taken alone, or any combination of two or more of the listed items may be taken. " For example, if a composition is described as containing the elements A, B, and / or C, the composition may contain only A; only B; only C; a combination of A and B; a combination of A and C; a combination of B and C; or a combination of A, B, and C. Furthermore, as used herein, including in the claims, "or" used in a list of items followed by at least one of "or" indicates a disjunctive list, so that a list such as "at least one of A, B, or C" means any one of A or B or C or AB or AC or BC or ABC (i.e., A and B and C), or any combination thereof.

[0113] The preceding description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Therefore, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication of a user equipment (UE), the method comprising: entering a dormant period for a secondary cell group (SCG) of a network entity during which no downlink (DL) data or control transmissions are received from the SCG; performing channel state information (CSI) measurements on the SCG during the dormant period to generate a measurement report; Determine an uplink (UL) beam of a primary and secondary cell (PSCELL) of the SCG; transmitting the measurement report to the network entity on the UL beam of the SCG; as well as During the dormant period and after transmitting the measurement report, determine one or more downlink (DL) beams for communicating on the SCG based on one or more rules and based on the measurement report, wherein the one or more rules cause the network entity to determine the same one or more DL beams based on the measurement report.

2. The method of claim 1 , wherein performing the measurement in the SCG comprises measuring at least one of a channel state information reference signal (CSI-RS) or a synchronization and signal block (SSB) of at least one of a primary secondary cell (PSCELL) or one or more secondary cells (SCELLs) of the SCG. 3 . The method of claim 2 , wherein performing the measurement in the SCG comprises measuring the CSI on the PSCELL when the PSCELL and the one or more SCELLs of the SCG are on the same frequency band. 4 . The method of claim 2 , wherein performing the measurement in the SCG comprises measuring the CSI on the PSCELL and the one or more SCELLs of the SCG when the PSCELL and the one or more SCELLs are on different frequency bands.

5. The method of claim 1 , further comprising changing a transmission code point (TCI) state on the UE to the one or more DL beams, wherein changing the TCI state on the UE to the one or more downlink beams is performed without signaling from the network entity.

6. The method of claim 1, further comprising receiving an SCG sleep command from a secondary node of the SCG, wherein entering the sleep period for the SCG is based on receiving the SCG sleep command.

7. The method of claim 1 , wherein determining the uplink (UL) beam comprises selecting a plurality of UL beams to follow the determined one or more DL beams, wherein the measurement report is transmitted to the network entity over a beam sweep during PUCCH / SRS transmission on the plurality of UL beams.

8. The method of claim 1, wherein determining the uplink (UL) beam is based on following a control resource set (CORESET) with a lowest ID.

9. The method of claim 1, further comprising: moving from said dormant phase to an active phase; as well as The determined one or more DL beams are used to communicate with the network entity after transitioning to the active period.

10. A method for wireless communication of a network entity, the method comprising: Instructing a user equipment (UE) to enter a dormant period for a secondary cell group (SCG) during which the UE will not receive downlink (DL) data or control transmissions from the SCG; receiving, during the dormant period for the SCG, a channel state information (CSI) measurement in a measurement report from the UE on an UL beam of a primary or secondary cell (PSCELL) of the SCG; During the dormant period and after transmitting the measurement report, determine one or more downlink (DL) beams for communicating with the UE on the SCG based on one or more rules and based on the measurement report, wherein the one or more rules cause the UE to determine the same one or more DL beams based on the measurement report.

11. The method of claim 10, wherein the measurement report is based on measuring at least one of a channel state information reference signal (CSI-RS) or a synchronization and signal block (SSB) of at least one of a primary secondary cell (PSCELL) or one or more secondary cells (SCELLs) of the SCG.

12. The method of claim 11, wherein the measurement report is based on measurement of the CSI on the PSCELL when the PSCELL and the one or more SCELLs of the SCG are on the same frequency band.

13. The method of claim 11, wherein the measurement report is based on measurements of the CSI on the PSCELL and the one or more SCELLs of the SCG when the PSCELL and the one or more SCELLs are on different frequency bands.

14. The method of claim 10, further comprising changing a transmission code point (TCI) state of the UE to the one or more DL beams, wherein changing the TCI state on the UE to the one or more downlink beams is performed without signaling from the network entity.

15. The method of claim 10, wherein instructing the UE to enter the sleep period for the SCG is based on a request from the UE to enter sleep.

16. The method of claim 10, further comprising monitoring a plurality of uplink (UL) beams for receiving the measurement report, wherein the plurality of UL beams for monitoring are determined by following the determined one or more DL beams, wherein the measurement report is transmitted to the network entity over a beam sweep during PUCCH / SRS transmission on the plurality of UL beams.

17. The method of claim 10, further comprising determining an uplink (UL) beam for receiving the measurement report, wherein determining the UL beam is based on following a control resource set (CORESET) with a lowest ID.

18. The method of claim 10, further comprising: moving from said dormant phase to an active phase; as well as The determined one or more DL beams are used to communicate with the UE after transitioning to the active period.

19. A user equipment (UE), the UE comprising: transmitter; at least one processor; as well as at least one memory, the at least one memory comprising instructions, The at least one processor is configured to execute the instructions to cause the UE to: entering a dormant period for a secondary cell group (SCG) of a network entity during which no downlink (DL) data or control transmissions are received from the SCG; performing channel state information (CSI) measurements on the SCG during the dormant period to generate a measurement report; Determine an uplink (UL) beam of a primary and secondary cell (PSCELL) of the SCG; transmitting the measurement report to the network entity via the transmitter on the UL beam of the SCG; as well as During the dormant period and after transmitting the measurement report, determine one or more downlink (DL) beams for communicating on the SCG based on one or more rules and based on the measurement report, wherein the one or more rules cause the network entity to determine the same one or more DL beams based on the measurement report.

20. The UE of claim 19, wherein the at least one processor is further configured to cause the UE to measure at least one of a channel state information reference signal (CSI-RS) or a synchronization and signal block (SSB) of at least one of a primary secondary cell (PSCELL) or one or more secondary cells (SCELLs) of the SCG.

21. The UE of claim 20, wherein the at least one processor is configured to measure the CSI-RS on the PSCELL when the PSCELL and the one or more SCELLs of the SCG are on the same frequency band.

22. The UE of claim 20, wherein the at least one processor is configured to measure the CSI-RS on the PSCELL and the one or more SCELLs of the SCG when the PSCELL and the one or more SCELLs are on different frequency bands.

23. The UE of claim 19, wherein the at least one processor is further configured to cause the UE to change a transmission code point (TCI) state on the UE to the one or more DL beams, wherein changing the TCI state on the UE to the one or more downlink beams is performed without signaling from the network entity.

24. The UE of claim 19, wherein the at least one processor is further configured to cause the UE to receive an SCG sleep command from a secondary node of the SCG, wherein entering the sleep period for the SCG is based on receiving the SCG sleep command.

25. The UE of claim 19, wherein the at least one processor is further configured to cause the UE to select multiple UL beams to follow the determined one or more DL beams, wherein the measurement report is transmitted to the network entity over a beam sweep during PUCCH / SRS transmission on the multiple UL beams.

26. The UE of claim 19, wherein the at least one processor is configured to determine the UL beam based on following a control resource set (CORESET) with a lowest ID.

27. The UE of claim 19, wherein the at least one processor is further configured to cause the UE to transition from the dormant period to an active period and to communicate with the network entity using the determined one or more DL beams after transitioning to the active period.

28. A network entity, comprising: at least one processor; as well as at least one memory, the at least one memory comprising instructions, wherein the at least one processor is configured to execute the instructions to cause the network entity to: Instructing a user equipment (UE) to enter a dormant period for a secondary cell group (SCG) during which the UE will not receive downlink (DL) data or control transmissions from the SCG; receiving, during the dormant period for the SCG, a channel state information (CSI) measurement in a measurement report from the UE on an UL beam of a primary or secondary cell (PSCELL) of the SCG; During the dormant period and after transmitting the measurement report, determine one or more downlink (DL) beams for communicating with the UE on the SCG based on one or more rules and based on the measurement report, wherein the one or more rules cause the UE to determine the same one or more DL beams based on the measurement report.

29. The network entity of claim 28, wherein the measurement report is based on measuring at least one of a channel state information reference signal (CSI-RS) or a synchronization and signal block (SSB) of at least one of a primary secondary cell (PSCELL) or one or more secondary cells (SCELLs) of the SCG.

30. The network entity of claim 29, wherein the measurement report is based on measurement of the CSI on the PSCELL when the PSCELL and the one or more SCELLs of the SCG are on the same frequency band.

31. The network entity of claim 29, wherein the measurement report is based on measurements of the CSI on the PSCELL and the one or more SCELLs of the SCG when the PSCELL and the one or more SCELLs are on different frequency bands.

32. The network entity of claim 28, wherein the at least one processor is further configured to cause the network entity to change a transmission code point (TCI) state of the UE to the one or more DL beams, wherein changing the TCI state on the UE to the one or more downlink beams is performed without signaling from the network entity.

33. The network entity of claim 28, wherein the at least one processor is configured to instruct the UE to enter the sleep period for the SCG based on a request from the UE to enter sleep.

34. The network entity of claim 28, wherein the at least one processor is configured to cause the network entity to monitor a plurality of uplink (UL) beams for receiving the measurement report, wherein the plurality of UL beams for monitoring are determined by following the determined one or more DL beams, and wherein the measurement report is transmitted to the network entity over a beam sweep during PUCCH / SRS transmission on the plurality of UL beams.

35. The network entity of claim 28, wherein the at least one processor is configured to determine an uplink (UL) beam for receiving the measurement report, wherein determining the UL beam is based on following a control resource set (CORESET) with a lowest ID.

36. The network entity of claim 28, wherein the at least one processor is further configured to cause the network entity to: transitioning from the dormant phase to the active phase; and The determined one or more DL beams are used to communicate with the UE after transitioning to the active period.

Images