Method and apparatus for transmit chain switching preparation time

Abstract

Methods, systems, and devices are described for wireless communication. In some wireless communication systems, a user equipment (UE) can support two or more uplink switching periods for transmit chain switching. The UE can transmit a UE capability message indicating a UE capability of supporting a first uplink switching period and a second uplink switching period for transmit chain switching. The first uplink switching period and the second uplink switching period can each correspond to a different switching period associated with configuration switching between different transmit chain configurations of the UE. The UE and a base station can select an uplink switching period from among the first uplink switching period and the second uplink switching period. The UE can transmit an uplink data message to the base station after a preparation time based on the uplink switching period.

Description

Technical Field

[0001] The following pertains to wireless communication, including transmit chain switching preparation time for uplink shared channels. Background Technology

[0002] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, message sending and receiving, broadcasting, and so on. These systems can support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth-generation (4G) systems (such as Long Term Evolution (LTE) systems, LTE-A Advanced (LTE-A) systems, or LTE-A Pro systems) and fifth-generation (5G) systems, which may be referred to as New Radio (NR) systems. These systems can employ various technologies, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal FDMA (OFDMA), or Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication from multiple communication devices, which may also be referred to as User Equipment (UE).

[0003] In some examples, the UE can be configured to support two concurrent uplink transmissions using a first transmit chain and a second transmit chain. These transmit chains can be configured to transmit on different frequency bands or component carriers at any given time. The UE can switch between transmit chain configurations during uplink handover periods.

[0004] Overview

[0005] The described technology relates to methods, systems, devices, and apparatuses that support improved preparation time for transmit chain handover for uplink shared channels. Generally, the described technology provides a User Equipment (UE) reporting two UE capabilities for uplink transmit chain handover. The UE can support two or more uplink handover periods based on which transmit chain configurations are being switched. The UE can transmit a UE capability message to the base station indicating UE capabilities supporting both a first uplink handover period and a second uplink handover period for transmit chain handover. Each of the first and second uplink handover periods may correspond to a different handover period associated with a configuration handover between different transmit chain configurations of the UE. The UE and the base station can select the uplink handover period from the reported first and second uplink handover periods based on one or more configuration criteria. For example, the UE and the base station can select the larger of the two indicated uplink handover periods. Additionally or alternatively, the UE and the base station can select the uplink handover period based on the type of configuration handover or based on signaling received from the base station. Both the UE and the base station can calculate the preparation time based on the selected handover period, such as the Physical Uplink Shared Channel (PUSCH) preparation time. The UE can transmit uplink data messages to the base station after the preparation time based on the selected uplink handover period.

[0006] A method for wireless communication at a UE is described. The method may include: transmitting a UE capability message indicating UE capabilities supporting both a first uplink switching period and a second uplink switching period for transmit chain switching, wherein the first uplink switching period and the second uplink switching period each correspond to different switching periods associated with configuration switching between different transmit chain configurations of the UE; selecting an uplink switching period from the first uplink switching period and the second uplink switching period; and transmitting an uplink data message after a preparation time based on the uplink switching period.

[0007] An apparatus for wireless communication is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. These instructions are executable by the processor to cause the apparatus to: transmit a UE capability message indicating UE capabilities supporting both a first uplink switching period and a second uplink switching period for transmit chain switching, wherein the first uplink switching period and the second uplink switching period each correspond to different switching periods associated with configuration switching between different transmit chain configurations of the UE; select an uplink switching period from the first uplink switching period and the second uplink switching period; and transmit an uplink data message after a preparation time based on the uplink switching period.

[0008] Another device for wireless communication is described. The device may include: means for transmitting a UE capability message indicating UE capabilities supporting both a first uplink switching period and a second uplink switching period for transmit chain switching, wherein the first uplink switching period and the second uplink switching period each correspond to different switching periods associated with configuration switching between different transmit chain configurations of the UE; means for selecting an uplink switching period from the first uplink switching period and the second uplink switching period; and means for transmitting uplink data messages after a preparation time based on the uplink switching period.

[0009] A non-transient computer-readable medium is described, storing code for wireless communication at a UE. The code may include instructions executable by a processor to: transmit a UE capability message indicating UE capabilities supporting both a first uplink switching period and a second uplink switching period for transmit chain switching, wherein the first and second uplink switching periods each correspond to different switching periods associated with configuration switching between different transmit chain configurations of the UE; select an uplink switching period from the first and second uplink switching periods; and transmit an uplink data message after a preparation time based on the uplink switching period.

[0010] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, transmitting a UE capability message may include operations, features, means, or instructions for: transmitting a UE capability message including a first uplink handover period parameter and a second uplink handover period parameter, wherein the first uplink handover period parameter is configured to indicate UE capability supporting a first uplink handover period and the second uplink handover period parameter is configured to indicate UE capability supporting a second uplink handover period.

[0011] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for: selecting a first uplink handover period supported by the UE from a first set of configured uplink handover periods corresponding to a first uplink handover period parameter; and selecting a second uplink handover period supported by the UE from a second set of configured uplink handover period parameters corresponding to a second uplink handover period parameter.

[0012] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for determining a PUSCH preparation time based on an uplink switching period, wherein the PUSCH preparation time includes the uplink switching period, and wherein the preparation time may be based on the PUSCH preparation time.

[0013] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, selecting an uplink switching period may include operations, features, means, or instructions for selecting a maximum duration from a first duration corresponding to a first uplink switching period and a second duration corresponding to a second uplink switching period, wherein the uplink switching period includes the maximum duration.

[0014] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for transmitting a second UE capability indicating that the UE supports single-antenna port transmission or dual-antenna port transmission on a frequency band configured for transmit chain switching.

[0015] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, selecting an uplink handover period may include operations, features, means, or instructions for selecting an uplink handover period based on a second UE capability, wherein a first uplink handover period may be associated with a single-antenna port transmission on a frequency band of the frequency band combination, and a second uplink handover period may be associated with a dual-antenna port transmission on a frequency band of the frequency band combination.

[0016] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for receiving a control signal indicating a first uplink switching period or a second uplink switching period, wherein the selection of the uplink switching period may be based on the control signal.

[0017] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for receiving control signals to schedule the transmission of uplink data messages according to a first transmit chain configuration, wherein the uplink switching period corresponds to a switching period associated with a configuration switch between the first transmit chain configuration and a second transmit chain configuration of the UE.

[0018] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for determining that a UE supports a first transmission chain and a second transmission chain, the first and second transmission chains being variably configured for single-port transmission, dual-port transmission or no transmission on each of the first and second carriers, wherein transmission of UE capability messages may be based on this determination.

[0019] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, a first uplink switching period supports a switching period associated with a configuration switching between a first transmit chain configuration supporting single-port transmission on a first carrier and a second transmit chain configuration supporting dual-port transmission on a second carrier.

[0020] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, a first uplink switching period supports a switching period associated with a configuration switching between a first transmit chain configuration supporting dual-port transmission on a first carrier and a second transmit chain configuration supporting single-port transmission on a second carrier.

[0021] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the second uplink switching period supports a switching period associated with a configuration switch between a first transmit chain configuration supporting dual-port transmission on a first carrier and a second transmit chain configuration supporting dual-port transmission on a second carrier.

[0022] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, transmitting an uplink data message may include operations, features, means, or instructions for: transmitting a first uplink data message on a first carrier; switching at least one of a first transmission chain or a second transmission chain between a first carrier and a second carrier during a preparation time; and transmitting the uplink data message on a second carrier according to the switching.

[0023] A method for wireless communication at a base station is described. The method may include: receiving a UE capability message from a UE, the UE capability message indicating UE capabilities supporting both a first uplink handover period and a second uplink handover period for transmit chain handover, wherein the first uplink handover period and the second uplink handover period each correspond to different handover periods associated with configuration handover between different transmit chain configurations of the UE; selecting an uplink handover period from the first uplink handover period and the second uplink handover period; and receiving an uplink data message from the UE after a preparation time based on the uplink handover period.

[0024] An apparatus for wireless communication is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. These instructions are executable by the processor to cause the apparatus to: receive a UE capability message from a UE, the UE capability message indicating UE capabilities supporting both a first uplink switching period and a second uplink switching period for transmit chain switching, wherein the first uplink switching period and the second uplink switching period each correspond to different switching periods associated with configuration switching between different transmit chain configurations of the UE; select an uplink switching period from the first uplink switching period and the second uplink switching period; and receive uplink data messages from the UE after a preparation time based on the uplink switching period.

[0025] Another device for wireless communication is described. The device may include: means for receiving a UE capability message from a UE, the UE capability message indicating UE capabilities supporting both a first uplink switching period and a second uplink switching period for transmit chain switching, wherein the first uplink switching period and the second uplink switching period each correspond to different switching periods associated with configuration switching between different transmit chain configurations of the UE; means for selecting an uplink switching period from the first uplink switching period and the second uplink switching period; and means for receiving uplink data messages from the UE after a preparation time based on the uplink switching period.

[0026] A non-transient computer-readable medium is described, storing code for wireless communication at a base station. The code may include instructions executable by a processor to: receive a UE capability message from a UE, the UE capability message indicating UE capabilities supporting both a first uplink handover period and a second uplink handover period for transmit chain handover, wherein the first uplink handover period and the second uplink handover period each correspond to different handover periods associated with configuration handover between different transmit chain configurations of the UE; select an uplink handover period from the first uplink handover period and the second uplink handover period; and receive uplink data messages from the UE after a preparation time based on the uplink handover period.

[0027] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, receiving a UE capability message may include operations, features, means, or instructions for: receiving a UE capability message including a first uplink handover period parameter and a second uplink handover period parameter, wherein the first uplink handover period parameter is configured to indicate UE capability supporting a first uplink handover period and the second uplink handover period parameter is configured to indicate UE capability supporting a second uplink handover period.

[0028] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the first uplink handover period supported by the UE may be selected from a first configured uplink handover period set corresponding to the first uplink handover period parameters; and the second uplink handover period supported by the UE may be selected from a second configured uplink handover period set corresponding to the second uplink handover period parameters.

[0029] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for determining a PUSCH preparation time based on an uplink switching period, wherein the PUSCH preparation time includes the uplink switching period, and wherein the preparation time may be based on the PUSCH preparation time.

[0030] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, selecting an uplink switching period may include operations, features, means, or instructions for selecting a maximum duration from a first duration corresponding to a first uplink switching period and a second duration corresponding to a second uplink switching period, wherein the uplink switching period includes the maximum duration.

[0031] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for receiving a second UE capability indicating that the UE supports single-antenna port transmission or dual-antenna port transmission on a frequency band configured for the transmit chain switching.

[0032] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, selecting an uplink handover period may include operations, features, means, or instructions for selecting an uplink handover period based on a second UE capability, wherein a first uplink handover period may be associated with a single-antenna port transmission on a frequency band of the frequency band combination, and a second uplink handover period may be associated with a dual-antenna port transmission on a frequency band of the frequency band combination.

[0033] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for transmitting a control signal indicating a first uplink switching period or a second uplink switching period, wherein the selection of the uplink switching period may be based on the control signal.

[0034] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for transmitting control signals to schedule the transmission of uplink data messages according to a first transmit chain configuration, wherein the uplink switching period corresponds to a switching period associated with a configuration switch between the first transmit chain configuration and a second transmit chain configuration of the UE.

[0035] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for determining that a UE supports a first transmission chain and a second transmission chain, the first and second transmission chains being variably configured for single-port transmission, dual-port transmission or no transmission on each of the first and second carriers, wherein receiving UE capability messages may be based on this determination.

[0036] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, a first uplink switching period supports a switching period associated with a configuration switching between a first transmit chain configuration supporting single-port transmission on a first carrier and a second transmit chain configuration supporting dual-port transmission on a second carrier.

[0037] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, a first uplink switching period supports a switching period associated with a configuration switching between a first transmit chain configuration supporting dual-port transmission on a first carrier and a second transmit chain configuration supporting single-port transmission on a second carrier.

[0038] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the second uplink switching period supports a switching period associated with a configuration switch between a first transmit chain configuration supporting dual-port transmission on a first carrier and a second transmit chain configuration supporting dual-port transmission on a second carrier.

[0039] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, receiving an uplink data message may include operations, features, means, or instructions for: receiving a first uplink data message on a first carrier; and receiving the uplink data message on a second carrier after a preparation time. Brief description of the attached diagram

[0041] Figure 1 An example of a wireless communication system that supports transmit chain switching preparation time for uplink shared channels according to various aspects of this disclosure is explained.

[0042] Figure 2An example of a wireless communication system that supports transmit chain switching preparation time for uplink shared channels according to various aspects of this disclosure is explained.

[0043] Figure 3 An example of a carrier switching timeline for uplink shared channel transmit chain switching preparation time, supported by various aspects of this disclosure, is explained.

[0044] Figure 4 An example of the process flow for transmit chain switching preparation time for uplink shared channels, supported by various aspects of this disclosure, is explained.

[0045] Figure 5 and 6 A block diagram of an apparatus for transmit chain switching preparation time for uplink shared channels, according to various aspects of this disclosure, is shown.

[0046] Figure 7 A block diagram of a communication manager supporting transmit chain switching preparation time for uplink shared channels, according to various aspects of this disclosure, is shown.

[0047] Figure 8 A diagram of a system including a device for transmit link switching preparation time for uplink shared channels, according to various aspects of this disclosure, is shown.

[0048] Figure 9 and 10 A block diagram of an apparatus for transmit chain switching preparation time for uplink shared channels, according to various aspects of this disclosure, is shown.

[0049] Figure 11 A block diagram of a communication manager supporting transmit chain switching preparation time for uplink shared channels, according to various aspects of this disclosure, is shown.

[0050] Figure 12 A diagram of a system including a device for transmit link switching preparation time for uplink shared channels, according to various aspects of this disclosure, is shown.

[0051] Figures 13 to 16 A flowchart illustrating a method for transmit chain switching preparation time for uplink shared channels, according to various aspects of this disclosure, is shown.

[0052] Detailed description

[0053] In some wireless communication systems, a User Equipment (UE) can be configured to support two concurrent transmissions using a first and a second transmit chain. These transmit chains can be configured to transmit on different frequency bands or component carriers at a given time. That is, the UE can support one or more of a 1T+1T configuration, an 0T+2T configuration, or a 2T+0T configuration, where T represents the active transmit chain or the number of antenna ports supported on each component carrier or frequency band. The UE can switch between different transmit chain configurations during corresponding uplink handover periods. In some cases, the UE can report uplink handover periods as UE capabilities, and UE capability reporting can be configured to convey individual UE handover capabilities. However, some UEs can be configured with transmit chain configurations corresponding to two or more uplink handover periods. That is, in some examples, the UE can support different uplink handover capabilities based on which transmit chain configuration it is switching to and from.

[0054] As described herein, a UE can signal support for two uplink handover periods via a UE capability message. The indicated handover period can be used for different types of configuration switching between different transmit chain configurations of the UE. For example, configuration switching may include switching between a single-antenna-port transmit chain configuration on a first carrier and a dual-antenna-port transmit chain configuration on a second carrier, or switching between a dual-antenna-port transmit chain configuration on a first carrier and a dual-antenna-port transmit chain configuration on a second carrier, or any other switching between transmit chain configurations. Thus, the UE capability message described herein may include two uplink handover period parameters.

[0055] The UE and base station can use one or more selection schemes to determine which of the two or more reported uplink handover periods should be applied to communications. In one example, the larger of the two reported uplink handover periods can be selected. In other examples, the uplink handover period can be dynamically selected for each scheduled transmission based on the type of configuration handover. Additionally or alternatively, the UE can report a second UE capability indicating support for single-antenna port or dual-antenna port transmission on each band of the band combination, and the handover period can be based on the reported UE capability, based on signaling received from the base station, or both. Both the UE and the base station can calculate the Physical Uplink Shared Channel (PUSCH) preparation time based on the selected uplink handover period.

[0056] The aspects of this disclosure are initially described in the context of a wireless communication system. Additional aspects of this disclosure are described with reference to carrier switching timelines and process flows. The aspects of this disclosure are further explained and described by means of and reference to apparatus diagrams, system diagrams, and flowcharts relating to the transmit chain switching preparation time for uplink shared channels.

[0057] Figure 1 Examples of a wireless communication system 100 supporting transmit link handover preparation time for uplink shared communication according to various aspects of this disclosure are described. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an Advanced LTE (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low latency communication, communication with low-cost and low-complexity devices, or any combination thereof.

[0058] Base station 105 can be distributed across a geographical area to form wireless communication system 100, and can be different types of devices or devices with different capabilities. Base station 105 and UE 115 can communicate wirelessly via one or more communication links 125. Each base station 105 can provide a coverage area 110, and UE 115 and base station 105 can establish one or more communication links 125 on the coverage area 110. Coverage area 110 can be an example of a geographical area over which base station 105 and UE 115 can support signal communication according to one or more radio access technologies.

[0059] Each UE 115 can be distributed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 can be stationary or mobile, or stationary and mobile at different times. Each UE 115 can be a different type of device or a device with different capabilities. Figure 1 The document describes some example UE 115s. The UE 115 described herein can communicate with various types of devices, such as other UE 115s, base station 105, or network equipment (e.g., core network nodes, relay equipment, integrated access and backhaul (IAB) nodes, or other network equipment). Figure 1 As shown in the image.

[0060] Each base station 105 may communicate with the core network 130, or with each other, or both. For example, base station 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base stations 105 may communicate with each other directly (e.g., directly between base stations 105), indirectly (e.g., via the core network 130), or directly and indirectly on backhaul links 120 (e.g., via X2, Xn, or other interfaces). In some examples, backhaul link 120 may be or include one or more radio links.

[0061] One or more of the base stations 105 described herein may include, or may be referred to by those skilled in the art as, base transceiver station, radio base station, access point, radio transceiver, B node, evolved B node (eNB), next-generation B node or gigabit B node (any of which may be referred to as gNB), home B node, home evolved B node, or other suitable terms.

[0062] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or any other suitable term, wherein "device" may also be referred to as a unit, station, terminal, or client, etc. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, which can be implemented in various objects such as appliances or vehicles, meters, etc.

[0063] The UE 115 described herein can communicate with various types of devices, such as other UEs 115 that sometimes act as relays, as well as base station 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, relay base stations, etc. Figure 1 As shown in the image.

[0064] UE 115 and base station 105 can wirelessly communicate with each other via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communication link 125. For example, a carrier for communication link 125 may include a portion of the radio spectrum band (e.g., a bandwidth portion (BWP)) operating according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling coordinating carrier operation, user data, or other signaling. Wireless communication system 100 may support communication with UE 115 using carrier aggregation or multi-carrier operation. UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation can be used in conjunction with frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0065] In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers. The carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel grid for discovery by UE 115. The carrier may operate in an autonomous mode in which initial acquisition and connection can be performed by UE 115 via that carrier, or in a non-autonomous mode in which the carrier may connect to carriers anchored using different carriers (e.g., different carriers of the same or different radio access technologies).

[0066] The communication link 125 shown in the wireless communication system 100 may include uplink transmission from UE 115 to base station 105, or downlink transmission from base station 105 to UE 115. The carrier may carry downlink or uplink communication (e.g., in FDD mode), or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0067] A carrier may be associated with a specific bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth may be one of several defined bandwidths (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz) of a carrier for a particular radio access technology. Devices of the wireless communication system 100 (e.g., base station 105, UE 115, or both) may have a hardware configuration that supports communication over a specific carrier bandwidth, or may be configurable to support communication over a single carrier bandwidth within a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate over a portion (e.g., a subband, BWP) or all of the carrier bandwidth.

[0068] The signal waveform transmitted on the carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform extended OFDM (DFT-S-OFDM)). In a system employing MCM, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the code rate of the modulation scheme, or both). Thus, the more resource elements the UE 115 receives and the higher the order of the modulation scheme, the higher the data rate the UE 115 can achieve. Wireless communication resources can refer to a combination of radio frequency spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and using multiple spatial layers can further improve the data rate or data integrity of communication with the UE 115.

[0069] It can support one or more sets of parameters for the carrier, wherein the parameter sets may include the subcarrier spacing ( Δf (and cyclic prefix). A carrier can be divided into one or more BWPs with the same or different parameter designs. In some examples, UE 115 can be configured with multiple BWPs. In some examples, a single BWP for a carrier can be active at a given time, and communication for UE 115 can be limited to one or more active BWPs.

[0070] The time interval of base station 105 or UE 115 can be expressed as a multiple of a basic time unit, such as the sampling period. T s =1 / ( Δf max N f ) seconds, of which Δf max This can represent the maximum supported subcarrier spacing, while N f This can represent the maximum supported Discrete Fourier Transform (DFT) size. The time interval of the communication resources can be organized according to radio frames, each with a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0071] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may (e.g., in the time domain) be divided into subframes, and each subframe may be further divided into several time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include several symbol periods (e.g., depending on the length of the cyclic prefix added before each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple mini-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f (Number) sampling periods. The duration of a symbol period can depend on the subcarrier spacing or the operating frequency band.

[0072] A subframe, time slot, mini-slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0073] Physical channels can be multiplexed on a carrier using various techniques. Physical control channels and physical data channels can be multiplexed on a downlink carrier, for example, using one or more of time-division multiplexing (TDM), frequency-division multiplexing (FDM), or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET)) for physical control channels can be defined by the number of symbol periods and can extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESET) can be configured for a set of UEs 115. For example, one or more of the UEs 115 can monitor or search control regions for control information based on one or more search space sets, and each search space set can include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for control channel candidates can refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information in a control information format having a given payload size. The search space set may include a common search space set configured to send control information to multiple UEs 115 and a UE-specific search space set configured to send control information to a specific UE 115.

[0074] Each base station 105 may provide communication coverage via one or more cells (e.g., macrocells, small cells, hotspots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used to communicate with base station 105 (e.g., on a carrier) and may be associated with an identifier used to distinguish adjacent cells (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID), or others). In some examples, a cell may also refer to a geographic coverage area 110 or a portion of geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. The extent of such cells may vary from smaller areas (e.g., structures, subsets of structures) to larger areas depending on various factors (such as the capabilities of base station 105). For example, a cell may be or include buildings, subsets of buildings, or external space between or overlapping geographic coverage areas 110, among other examples.

[0075] Macrocells typically cover a relatively large geographic area (e.g., a radius of several kilometers) and allow unrestricted access for UEs 115 that have service subscriptions with a network provider supporting the macrocell. Small cells may be associated with a lower-power base station 105 (compared to macrocells) and may operate in the same or different (e.g., licensed or unlicensed) frequency bands as macrocells. Small cells may provide unrestricted access to UEs 115 that have service subscriptions with a network provider, or may provide restricted access to UEs 115 associated with a small cell (e.g., UE 115 in a Closed Subscriber Group (CSG), or UE 115 associated with a user in a home or office). Base station 105 may support one or more cells and may also support communication on one or more cells using one or more component carriers.

[0076] In some examples, a carrier can support multiple cells and can be configured with different cells based on different protocol types that can provide access for different types of devices (e.g., MTC, Narrowband IoT (NB-IoT), Enhanced Mobile Broadband (eMBB)).

[0077] In some examples, base station 105 may be mobile, and thus provide communication coverage to mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. Wireless communication system 100 may include, for example, a heterogeneous network, in which different types of base stations 105 use the same or different radio access technologies to provide coverage to various geographic coverage areas 110.

[0078] The wireless communication system 100 can support synchronous or asynchronous operation. For synchronous operation, base stations 105 can have similar frame timing, and transmissions from different base stations 105 can be approximately time-aligned. For asynchronous operation, base stations 105 can have different frame timing, and transmissions from different base stations 105 may not be time-aligned in some examples. The techniques described herein can be used for both synchronous and asynchronous operation.

[0079] Some UE 115 devices (such as MTC or IoT devices) can be low-cost or low-complexity devices and can provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with base station 105 without human intervention. In some examples, M2M communication or MTC may include communication from devices that have integrated sensors or meters to measure or capture information and relay such information to a central server or application that uses the information or presents it to people interacting with the application. Some UE 115 devices may be designed to collect information or automate the behavior of machines or other devices. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wilderness survival monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial toll collection.

[0080] Some UEs 115 can be configured to operate in reduced-power modes, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication can be performed at reduced peak rates. Other power-saving techniques for UEs 115 include entering a power-saving deep sleep mode when not engaged in active communication, operating on limited bandwidth (e.g., according to narrowband communication), or a combination of these techniques. For example, some UEs 115 can be configured to operate using a narrowband protocol type associated with a defined portion or range (e.g., a subcarrier or resource block (RB) set) within the carrier, within the carrier's guard band, or outside the carrier.

[0081] Wireless communication system 100 may be configured to support ultra-reliable communication or low latency communication, or various combinations thereof. For example, wireless communication system 100 may be configured to support ultra-reliable low latency communication (URLLC) or mission-critical communication. UE 115 may be designed to support ultra-reliable, low latency, or mission-critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private or group communication and may be supported by one or more mission-critical services, such as Mission-Critical Talk-to-Talk (MCPTT), Mission-Critical Video (MCVideo), or Mission-Critical Data (MCData). Support for mission-critical functions may include prioritization of services, and mission-critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low latency, mission-critical, and ultra-reliable low latency are used interchangeably herein.

[0082] In some examples, UE 115 may also be able to communicate directly with other UE 115 on a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UE 115s utilizing D2D communication may be within the geographic coverage area 110 of base station 105. Other UE 115s in such a group may be outside the geographic coverage area 110 of base station 105 or may be unable to receive transmissions from base station 105 for other reasons. In some examples, groups of UE 115s communicating via D2D communication may utilize a one-to-many (1:M) system, where each UE 115 transmits to every other UE 115 in the group. In some examples, base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between the individual UE 115s without involving base station 105.

[0083] In some systems, the D2D communication link 135 may be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, vehicles may communicate using vehicle-to-vehicle (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these communications. Vehicles may signal information related to traffic conditions, signaling, weather, safety, emergencies, or any other information relevant to the V2X system. In some examples, vehicles in a V2X system may communicate via vehicle-to-network (V2N) communication through one or more network nodes (e.g., base station 105) with roadside infrastructure (such as roadside units), or with the network, or with both.

[0084] Core network 130 provides user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC) or a 5G core (5GC). The EPC or 5GC may include at least one control plane entity (e.g., a Mobility Management Entity (MME), Access and Mobility Management Function (AMF)) managing access and mobility, and at least one user plane entity (e.g., a Serving Gateway (S-GW), Packet Data Network (PDN) Gateway (P-GW), or User Plane Function (UPF)) routing packets or interconnecting to external networks. The control plane entity manages non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by base station 105 associated with core network 130. User IP packets can be delivered through the user plane entity, which provides IP address allocation and other functions. The user plane entity may be connected to one or more network operator IP services 150. The IP service 150 may include access to the Internet, intranet, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0085] Some network devices (such as base station 105) may include sub-components, such as access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with each UE 115 through one or more other access network transport entities 145, which may be referred to as a radio headend, smart radio headend, or transmit / receive point (TRP). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio headends and ANCs) or combined into a single network device (e.g., base station 105).

[0086] Wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 MHz to 300 GHz. Generally, the 300 MHz to 3 GHz band is referred to as a UHF band or decimeter band because the wavelengths range from approximately 1 decimeter to 1 meter. UHF waves can be blocked or redirected by buildings and environmental features, but these waves can penetrate various structures sufficiently for macrocells to provide service to UE 115 located indoors. Compared to transmissions using smaller frequencies and longer waves in the lower HF or VHF portions of the spectrum below 300 MHz, UHF wave transmission can be associated with smaller antennas and shorter ranges (e.g., less than 100 km).

[0087] The wireless communication system 100 can also operate in the ultra-high frequency (SHF) zoning using a frequency band from 3 GHz to 30 GHz (also known as the centimeter band) or in the extremely high frequency (EHF) zoning using a spectrum (e.g., from 30 GHz to 300 GHz) (also known as the millimeter band). In some examples, the wireless communication system 100 can support millimeter-wave (mmW) communication between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices can be smaller and more closely spaced than UHF antennas. In some examples, this can facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may suffer even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein can be employed across transmissions using one or more different frequency zonings, and the frequency band usage specified across these frequency zonings may vary by country or regulatory authority.

[0088] Wireless communication system 100 may utilize both licensed and unlicensed radio spectrum bands. For example, wireless communication system 100 may employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in unlicensed frequency bands, such as the 5 GHz Industrial, Scientific, and Medical (ISM) band. When operating in unlicensed radio spectrum bands, devices (such as base station 105 and UE 115) may employ carrier sensing for collision detection and avoidance. In some examples, operation in unlicensed frequency bands may be based on carrier aggregation configuration (e.g., LAA) in coordination with component carriers operating in licensed frequency bands. Operation in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, etc.

[0089] Base station 105 or UE 115 may be equipped with multiple antennas that can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels that can support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly (such as an antenna tower). In some examples, the antennas or antenna arrays associated with base station 105 may be located in different geographical locations. Base station 105 may have an antenna array with several rows and columns of antenna ports that base station 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0090] Base station 105 or UE 115 can use MIMO communication to leverage multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. This technique is known as spatial multiplexing. For example, a transmitting device may transmit multiple signals via different antennas or different combinations of antennas. Similarly, a receiving device may receive multiple signals via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO), where multiple spatial layers are transmitted to the same receiving device; and multi-user MIMO (MU-MIMO), where multiple spatial layers are transmitted to multiple devices.

[0091] Beamforming (also known as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting or receiving device (e.g., base station 105, UE 115) to shape or guide an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array, such that some signals propagating relative to a particular orientation of the antenna array experience constructive interference, while others experience destructive interference. Adjustments to the signals transmitted via the antenna elements may include the transmitting or receiving device applying amplitude offset, phase offset, or both to the signals carried via the antenna elements associated with that device. The adjustments associated with each antenna element may be defined by a beamforming weight set associated with a particular orientation (e.g., the antenna array relative to the transmitting or receiving device, or relative to some other orientation).

[0092] Base station 105 or UE 115 may use beamsweeping technology as part of beamforming operations. For example, base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by base station 105 in different directions. For example, base station 105 may transmit signals according to different beamforming weight sets associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by the transmitting device (such as base station 105) or the receiving device (such as UE 115)) to identify the beam direction that base station 105 will use for later transmission or reception.

[0093] Some signals, such as data signals associated with a specific receiving device, may be transmitted by base station 105 in a single beam direction (e.g., the direction associated with the receiving device, such as UE 115). In some examples, the beam direction associated with transmission along a single beam direction may be determined based on the signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signals received by UE 115 with the highest signal quality or other acceptable signal quality.

[0094] In some examples, transmissions performed by a device (e.g., by base station 105 or UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate combined beams for transmission (e.g., from base station 105 to UE 115). UE 115 may report feedback indicating precoding weights for one or more beam directions, and this feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. Base station 105 may transmit reference signals that can be precoded or unprecoded (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)). UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel type codebook, linear combination type codebook, port selection type codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may use similar techniques to transmit signals multiple times in different directions (e.g., to identify the beam direction used by UE 115 for subsequent transmission or reception) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0095] A receiver device (e.g., UE 115) may attempt multiple receive configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105. For example, the receiver device may attempt multiple receive directions by: receiving via different antenna subarrays; processing received signals according to different antenna subarrays; receiving according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of the antenna array (e.g., different directional listening weight sets); or processing received signals according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of the antenna array, any of which may be referred to as "listening" according to different receive configurations or receive directions. In some examples, the receiver device may use a single receive configuration to receive along a single beam direction (e.g., when a data signal is received). The single receive configuration may be aligned on a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0096] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer can be IP-based. The Radio Link Control (RLC) layer performs packet segmentation and reassembly for communication on logical channels. The Media Access Control (MAC) layer performs priority handling and multiplexes logical channels into transport channels. The MAC layer can also use error detection, error correction, or both to support MAC layer retransmissions to improve link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer can provide the establishment, configuration, and maintenance of RRC connections between the UE 115 and the base station 105 or core network 130 that support user plane data radio bearers. At the physical layer, transport channels can be mapped to physical channels.

[0097] UE 115 and base station 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique used to increase the likelihood of correctly receiving data on communication link 125. HARQ may include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), forward error correction (FEC), and retransmission (e.g., Automatic Repeat Request (ARQ)). HARQ can improve MAC layer throughput in poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, the device may support simultaneous time-slot HARQ feedback, where the device can provide HARQ feedback in a specific time slot for data received in previous symbols within that time slot. In other cases, the device may provide HARQ feedback in subsequent time slots or according to a different time interval.

[0098] In some examples, UE 115 may report two UE capabilities for uplink transmit chain handover. UE 115 may support two or more uplink handover periods based on which transmit chain configurations are being switched. UE 115 may transmit a UE capability message to base station 105 indicating UE capabilities supporting both a first uplink handover period and a second uplink handover period for transmit chain handover. Each of the first and second uplink handover periods may correspond to a different handover period associated with a configuration handover between different transmit chain configurations of UE 115. UE 115 and base station 105 may select an uplink handover period from the first and second reported uplink handover periods based on one or more configuration criteria. For example, UE 115 and base station 105 may select the larger of the two indicated uplink handover periods. Additionally or alternatively, UE 115 and base station 105 may select an uplink handover period based on the type of configuration handover or based on signaling received from the base station. Both UE 115 and base station 105 can calculate preparation time, such as PUSCH preparation time, based on the selected handover period. UE 115 can transmit uplink data messages to base station 105 after the preparation time based on the selected uplink handover period.

[0099] Figure 2 Examples of a wireless communication system 200 supporting transmit link handover preparation time for an uplink shared channel, according to various aspects of this disclosure, are described. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100. For example, the wireless communication system 200 may include a base station 105-a and a UE 115-a, which may represent as referred to Figure 1 Examples of base station 105 and UE 115 described. UE 115-a and base station 105-a may communicate uplink and downlink messages via a first carrier 205 (e.g., carrier 1) and a second carrier 210 (e.g., carrier 2). In some examples, UE 115-a may transmit UE capability message 220 to base station 105-a via the first carrier 205, the second carrier 210, or another carrier (not shown) to indicate one or more uplink handover periods supported by UE 115-a.

[0100] UE 115-a can be configured to support two transmit chains 215-a and 215-b. In some cases, the first transmit chain 215-a can be configured to support communication on the first carrier 205 (carrier 1) and the second carrier 210 (carrier 2), and the second transmit chain 215-b can be configured to support communication on the second carrier 210. In such cases, UE 115-a can support transmit chain switching between the first transmit chain configuration (case 1) (where the first transmit chain 215-a is configured on the first carrier 205 and the second transmit chain 215-b is configured on the second carrier 210 (e.g., 1T+1T, where each T represents the number of transmit chains or supported antenna ports on each carrier)) and the second transmit chain configuration (case 2) (where both the first transmit chain 215-a and the second transmit chain 215-b are configured on the second carrier 210 (e.g., 0T+2T)).

[0101] Between uplink transmissions, it may be necessary for UE 115-a to retune its radio frequency (RF) components (e.g., RF state) to switch uplink handover periods (or gaps) on transmit chain 215. The RF state of UE 115-a may refer to the configuration of the first transmit chain 215-a and / or the second transmit chain 215-b with respect to being tuned to the first carrier 205 and / or the second carrier 210, which may be additionally or alternatively referred to as the transmit chain configuration. The RF state and / or transmit chain configuration of UE 115-a may refer to the configuration of the first transmit chain 215-a, the second transmit chain 215-b, or both with respect to whether they are configured for single-antenna-port transmission, dual-antenna-port transmission, or both on the first carrier 205 and / or the second carrier 210. Retuning or otherwise reconfiguring the RF state of UE 115-a (e.g., the current RF state) may refer to retuning or reconfiguring the first transmit chain 215-a, the second transmit chain 215-b, or both between single-antenna port transmission and dual-antenna port transmission (or vice versa) on the first carrier 205 and / or the second carrier 210.

[0102] In an example of the wireless communication system 200, both the first transmission chain 215-a and the second transmission chain 215-b can be configured to support communication on the first carrier 205 and the second carrier 210. That is, the first transmission chain 215-a and the second transmission chain 215-b can be variably configured to support single-port transmission, dual-port transmission, or no transmission on the first carrier 205 and the second carrier 210 at any given time. In such a case, a third transmission chain configuration (case 3) can be configured for the UE 115-a. The third transmission chain configuration may correspond to both the first transmission chain 215-a and the second transmission chain 215-b configured on the first carrier 205 (e.g., 2T+0T). The UE 115-a can support transmission chain switching between the following: the first transmission chain configuration (case 1), the second transmission chain configuration (case 2), the third transmission chain configuration (case 3), or any combination thereof. Example transmission chain configurations for each case are illustrated in Table 1.

[0103]

[0104] Table 1: Launch chain configurations for scenarios 1, 2, and 3

[0105] The third transmit chain configuration can be configured to support Supplemental Uplink (SUL) communication, inter-band uplink carrier aggregation communication, intra-band uplink carrier aggregation communication, other uplink communication, or any combination thereof. In one example, UE115-a may support inter-band uplink carrier aggregation. That is, UE115-a may support multiple carriers (such as carriers 205 and 210) located in different operating frequency bands of a frequency band combination. For example, the first component carrier 205 may correspond to the first frequency band, and the second component carrier 210 may correspond to the second frequency band. In such a case, UE115-a may support simultaneous transmission on the first carrier 205 and the second carrier 210. UE115-a may support each of the first, second, and third transmit chain configurations explained in Table 1, while also supporting inter-band uplink carrier aggregation. In some examples, the inter-band uplink carrier aggregation configuration that supports simultaneous transmission on two or more carriers may be referred to as uplink carrier aggregation option 2.

[0106] In another example, UE 115-a can be configured with both SUL and non-SUL carriers. UE 115-a may not support simultaneous transmission on both SUL and non-SUL carriers. Accordingly, the first transmit chain configuration (Scenario 1) may not support the SUL carrier configuration. That is, because the first transmit chain configuration configures UE 115-a to simultaneously support the first transmit chain 215-a on the first carrier 205 (which may be an example of an SUL carrier) and the second transmit chain 215-b on the second carrier 210 (which may be an example of a non-SUL carrier), the first transmit chain configuration may be incompatible with the SUL configuration. Thus, if UE 115-a is configured with an SUL carrier, UE 115-a can be configured to support uplink transmit chain switching between the second transmit chain configuration (Scenario 2) and the third transmit chain configuration (Scenario 3), but UE 115-a may not support the first transmit chain configuration. Example transmit chain configurations for the SUL configuration are illustrated in Table 2.

[0107]

[0108] Table 2: Transmit chain configurations for SUL or inter-band uplink carrier aggregation

[0109] In some examples, UE 115-a can be configured to support uplink carrier aggregation option 1 (which can be similar to inter-band uplink carrier aggregation option 2), but may not support simultaneous transmission on both the first carrier 205 and the second carrier 210. Thus, uplink carrier aggregation option 1 can correspond to the second transmit chain configuration and the third transmit chain configuration as explained in Table 2. That is, when UE 115-a supports uplink carrier aggregation option 1, UE 115-a can support uplink transmit chain switching between scenarios 2 and 3, but UE 115-a may not support scenario 1.

[0110] In another example, UE 115-a may be configured with a combination of frequency bands including a first frequency band (e.g., frequency band A) and a second frequency band (e.g., frequency band B). The second frequency band may be configured to support in-band uplink carrier aggregation (e.g., a dual-component carrier band). That is, the second frequency band may include two or more adjacent aggregated carriers. In the example of wireless communication system 200, the second carrier 210 and the third carrier (carrier 3) may be adjacent carriers within the second frequency band. The first frequency band may include the first carrier 205. In this case, UE 115-a may support uplink transmit chain switching between the three carriers. UE 115-a may support uplink transmit chain switching between these three transmit chain configurations (Scenario 1, Scenario 2, and Scenario 3) applied to the corresponding frequency bands but not the carriers. Example transmit chain configurations for this type of in-band configuration are illustrated in Table 3.

[0111]

[0112] Table 3: Transmit chain configuration for in-band communication

[0113] In some examples, the frequency bands can be configured as a combination of SUL (Suspended Ultra-Ultimate) frequency bands. That is, the first frequency band can be an SUL band, and the second frequency band can be a non-SUL band. The SUL band may not support in-band uplink carrier aggregation. Accordingly, the SUL band may include a single SUL carrier (e.g., carrier 1), and the non-SUL band may include two or more adjacent aggregated carriers (e.g., carrier 2 and carrier 3). In such cases, UE 115-a can support uplink transmit chain switching between each of the three transmit chain configurations (e.g., scenarios 1, 2, and 3) as explained in Table 3.

[0114] The third transmit chain configuration (Scenario 3) can introduce additional uplink handover periods (gap) for UE 115-a. For example, if UE 115-a is configured to support uplink transmit chain handover between the first and second transmit chain configurations, but not the third transmit chain configuration, then UE 115-a can indicate UE capabilities corresponding to the first uplink handover period supported by UE 115-a. The first uplink handover period can provide time for UE 115-a to handover between single-port transmission on the first carrier 205 and dual-port transmission on the second carrier 210 (or vice versa). If UE115-a is configured to support uplink transmit chain handover between each of the first, second, and third transmit chain configurations, then UE115-a may perform transmit chain handover according to the first uplink handover period, and UE115-a may additionally or alternatively perform transmit chain handover between dual-port transmission on the first carrier 205 and dual-port transmission on the second carrier 210 according to the second uplink handover period (e.g., for handover between scenario 2 and scenario 3). The second uplink handover period for handover between scenario 2 and scenario 3 may be different from the first uplink handover period for handover between scenario 1 and scenario 2 or between scenario 1 and scenario 3.

[0115] UE 115-a can transmit UE capability message 220 to indicate supported uplink handover periods. In some cases, UE capability message 220 may include a first uplink handover period parameter (e.g., uplinkTxSwitchingPeriod-r16 ( Uplink Tx switching period - r16The UE capability message 220 is configured to indicate a first uplink handover period for switching between single-port transmission on the first carrier 205 and dual-port transmission on the second carrier 210 (or vice versa). This uplink handover period parameter may include a set of potential uplink handover period durations (e.g., [35µs, 140µs, 210µs], or some other set of uplink handover period durations), and the UE 115-a may select a first uplink handover period supported by the UE 115-a from this set of uplink handover period durations. The base station 105-a may accordingly prepare to receive uplink transmissions from the UE 115-a via the first carrier 205 and / or the second carrier 210. However, if the UE 115-a supports a second uplink handover capability for switching between dual-port transmission on the first carrier 205 and dual-port transmission on the second carrier 210 (e.g., between scenario 2 and scenario 3), in some cases, the UE capability message 220 may not include parameters configured to convey the supported second uplink handover period.

[0116] As described herein, UE capability message 220 may include a UE capability report configured to convey two or more uplink handover periods supported by UE 115-a. In other words, UE 115-a may report one or more uplink handover values ​​as UE capabilities via UE capability message 220. The UE capability report may include a first uplink handover period parameter (e.g., uplinkTxSwitchingPeriod-r17–1Tx - 2Tx ( Uplink Tx switching period -r17–1Tx - 2Tx )) and the second uplink handover period parameter (e.g., uplinkTxSwitchingPeriod-r17–2Tx - 2Tx ( Uplink Tx Switching time period -r17–2Tx - 2TxThe first uplink handover period parameter indicates the first uplink handover period supported by UE 115-a for handover between a single transmit chain 215 and a dual transmit chain 215 (e.g., 1Tx-2Tx) on a single carrier. In other words, the first uplink handover period can support configuration switching between a first transmit chain configuration (which supports single-port transmission on one or both of the first carrier 205 or the second carrier 210) and a second or third transmit chain configuration (which supports dual-port transmission on the other of the first carrier 205 or the second carrier 210). The second uplink handover period parameter indicates the second uplink handover period supported by UE 115-a for handover between a dual transmit chain on one carrier and a dual transmit chain on another carrier (e.g., 2Tx-2Tx). In other words, the second uplink switching period can support configuration switching between the third and second transmit chain configurations (which support dual-port transmission on the first carrier 205 and the second carrier 210) (or vice versa).

[0117] UE capability reports can be configured as information elements and can be transmitted (e.g., via the Physical Uplink Control Channel (PUCCH) on a first carrier 205, a second carrier 210, or some other uplink carrier) via RRC signaling, MAC-CE, or some other uplink control signaling. An example UE capability report is described below, which includes two parameters used to convey capability values ​​for these two uplink handover periods.

[0118] ULTxSwitchingBandPair-r17::= SEQUENCE {

[0119] bandIndexUL1-r17 INTEGER(1.maxSimultaneousBands), bandIndexUL2-r17 INTEGER(1.maxSimultaneousBands), uplinkTxSwitchingPeriod-r17–1Tx-2Tx ENUMERATED {n35us, n140us,n210us}, uplinkTxSwitchingPeriod-r17–2Tx-2Tx ENUMERATED {n35us, n140us,n210us}, uplinkTxSwitching-DL-Interruption-r17 BIT STRING (SIZE(1.maxSimultaneousBands)) OPTIONAL

[0120] Example UE Capability Report

[0121] Each uplink handover period parameter may include a list of configured uplink handover period values ​​for UE 115-a to select from. UE 115-a may select a first uplink handover period capability value from a first list corresponding to the first parameter, and a second uplink handover period capability value from a second list corresponding to the second parameter. In the example UE capability report described above, the first uplink handover period parameter and the second uplink handover period parameter may correspond to the same list of configured uplink handover periods (e.g., 35us, 140us, and 210us). Additionally or alternatively, the first uplink handover period parameter and the second uplink handover period parameter may correspond to different lists including different configured uplink handover period values.

[0122] It should be understood that although this example UE capability report is shown to include the explained parameters and values, a UE capability report may include any parameters or convey any values, including those not shown in this example UE capability report. In some examples, UE 115-a may indicate two or more supported uplink handover periods via another information element or control signal different from the explained example UE capability report, or UE 115-a may indicate supported uplink handover periods via additional parameters not explained.

[0123] Accordingly, UE 115-a may indicate a first uplink handover capability corresponding to a first uplink handover period supported by UE 115-a and a second uplink handover capability corresponding to a second uplink handover period supported by UE 115-a. Additionally or alternatively, UE 115-a may indicate a single uplink handover capability, or the first and second uplink handover periods may be the same. In some examples, UE 115-a may indicate a second UE capability via UE capability message 220 or some other control signaling. The second UE capability may indicate that UE 115-a supports at most single-antenna port transmission or dual-antenna port transmission on a given frequency band of a frequency band combination configured for uplink transmit chain handover. In some examples, if UE 115-a supports in-band uplink carrier aggregation on a frequency band combination, UE 115-a may transmit the second UE capability.

[0124] Base station 105-a can receive an indication of supported uplink handover capabilities via UE capability message 220. Base station 105-a and UE 115-a can select from the reported uplink handover periods the uplink handover period to apply to subsequent uplink communication (e.g., T switch Base station 105-a and UE 115-a may be configured with one or more selection schemes for selecting uplink handover periods. In one example, base station 105-a and UE 115-a may be configured to select the maximum uplink handover period from the reported uplink handover periods. That is, the longest duration handover period, including each of the reported handover period capabilities, may be selected and applied to communication. If UE 115-a communicates via two uplink handover period parameters (e.g., uplinkTxSwitchingPeriod-r17–1Tx - 2Tx and uplinkTxSwitchingPeriod-r17–2Tx - 2Tx If two uplink handover periods are reported, then UE 115-a and base station 105-a can select the uplink handover period according to Equation 1.

[0125]

[0126] In another example, base station 105-a and UE 115-a can be configured to select the uplink handover period based on a second UE capability that supports single-port or dual-port transmission on each of a given frequency band combination. UE 115-a can support two uplink handover modes. A first mode (Mode 1) can correspond to a first uplink handover period (e.g., 1Tx-2Tx) for handover between single-port transmission on the first frequency band and dual-port transmission on the second frequency band. A second mode (Mode 2) can correspond to a second uplink handover period (e.g., 2Tx-2Tx) for handover between dual-port transmission on the first frequency band and dual-port transmission on the second frequency band. Within one mode, UE 115-a can use the handover period associated with the corresponding mode. For a given frequency band combination (e.g., frequency band X and frequency band Y), if UE 115-a indicates the maximum supported antenna port capacity of two antenna ports on each frequency band of the frequency band combination (e.g., on each of frequency band X and frequency band Y), then base station 105-a and UE 115-a may select a second uplink handover period (e.g., 2Tx-2Tx) for each transmit chain handover performed by UE 115-a (e.g., a handover between each of scenario 1, scenario 2, and scenario 3). If UE 115-a indicates the maximum supported antenna port capacity of one antenna port on any frequency band of the frequency band combination (e.g., on at least one of frequency band X or frequency band Y), then UE 115-a and base station 105-a may select a first uplink handover period (e.g., 1Tx-2Tx) for each transmit chain handover performed by UE 115-a (e.g., a handover between scenario 1 and scenario 2 or between scenario 1 and scenario 3).

[0127] In some examples, base station 105-a may receive an indication of the capabilities of a second UE, and the base station may transmit control signals configuring UE 115-a to operate in mode 1 or mode 2. That is, base station 105-a may indicate to UE 115-a which uplink handover period to select. Base station 105-a may transmit the indication of the uplink handover period based on an implicit indication of the capabilities of UE 115-a received via the capabilities of the second UE. The control signals may be transmitted via RRC signaling or some other control signaling.

[0128] In another example, base station 105-a and UE 115-a can dynamically select the uplink handover period for each scheduling decision. Base station 105-a can transmit control signals, such as RRC signals, downlink control information (DCI), or some other control signal, which schedule the transmission of uplink data messages by UE 115-a according to a first transmit chain configuration. UE 115-a can support a second transmit chain configuration before the scheduled uplink data message transmission (e.g., the current RF state of UE 115-a supports a second transmit chain configuration). UE 115-a and base station 105-a can select the uplink handover period based on the handover period associated with the configuration switch between the first and second transmit chain configurations of UE 115-a. For example, if one of the first or second transmit chain configurations corresponds to scenario 1 and the other transmit chain configuration corresponds to one of scenario 2 or scenario 3, then UE 115-a and base station 105-a will select a first uplink handover period (e.g., 1Tx-2Tx). If the first and second transmit chain configurations correspond to scenarios 2 and 3, then UE 115-a and base station 105-a will select a second uplink handover period (e.g., 2Tx-2Tx).

[0129] If a single uplink handover capability is reported, base station 105-a and UE 115-a can select the reported uplink handover capability. Base station 105-a and UE 115-a can communicate via the first carrier 205 and / or the second carrier 210 depending on the selected handover period. (Other parts of this document, including references...) Figure 3 The details of the timing for performing the configuration switching between carriers used for scheduled uplink transmissions are described in further detail.

[0130] In some examples, UE 115-a may be configured with a processing time to prepare for uplink transmission. This processing time may be referred to as the PUSCH preparation time. The PUSCH preparation time may include one or more configured processing durations, which include uplink transmit chain handover periods. For example, UE 115-a may be configured with an equation (such as Equation 2) for calculating the PUSCH preparation time, and this equation may include selected uplink handover periods (e.g., T switch ).

[0131]

[0132] In Equation 2 T switchThe parameter can represent an uplink handover period selected from two or more uplink handover periods reported by UE 115-a via UE capability message 220 as described herein. If uplink transmit chain handover is not configured for UE 115-a, then... T switch The parameter can be 0. If UE 115-a reports a single uplink handover period, then T switch The parameter can represent the reported uplink switching period.

[0133] In the example of Equation 2, μ The parameter may correspond to the subcarrier spacing (SCS) value associated with the downlink communication link in which the physical downlink control channel (PDCCH) carrying the DCI carrying the scheduled uplink transmission (e.g., PUSCH) is transmitted. N 2 Parameters can be based on μ The value and the processing capability of UE 115-a are used to determine this. If the first symbol allocated by PUSCH includes a demodulation reference signal (DMRS) allocation, then... d 2,1 The parameter can be 0. If the first symbol allocated by PUSCH includes an allocation different from that of DMRS, then d 2,1 This can be set to 1. If a BWP switch is triggered (e.g., if a DCI scheduling triggers a BWP switch), then... d 2,2 The parameter can be set to the switching time used for BWP switching. If BWP switching is not triggered, then d 2,2 It can be 0. If the PUSCH of the higher priority index overlaps with the PUCCH of the lower priority index, it can be reported by UE115-a. d 2 Parameters. Otherwise, d 2 It can be set to 0. This can be calculated for operations with shared spectrum channel access. T ext Parameters. Otherwise, T ext It can be set to 0. k and T C The parameter can be a constant.

[0134] Accordingly, UE 115-a, as described herein, may indicate UE capabilities supporting two or more uplink handover periods for transmit chain switching. UE 115-a and base station 105-a may select sufficient uplink handover periods based on one or more of the configured selection schemes described herein, according to each reported UE capability. UE 115-a and base station 105-a may calculate the PUSCH preparation time based on Equation 2 or some other configured equation, such that the PUSCH preparation time includes the selected uplink transmit chain handover.

[0135] Figure 3 Examples of carrier switching timelines 300 supporting transmit chain handover preparation time for uplink shared channels according to various aspects of this disclosure are explained. In some examples, the carrier switching timeline 300 may be implemented by or through various aspects of wireless communication systems 100 and 200. For example, the carrier switching timeline 300 illustrates a timeline for UE 115 to switch between a first carrier and a second carrier for communication with base station 105. UE 115 and base station 105 may represent as referred to herein. Figure 1 and 2 Example of the corresponding device described. UE 115 can perform uplink carrier switching between a first carrier and a second carrier to transmit one or more uplink messages to base station 105.

[0136] UE 115 can be configured with one or more transmit chains, as shown in reference Figure 2 As described. UE 115 can support uplink transmit link switching between a first carrier and a second carrier, or a first frequency band including a first carrier and a second carrier, a third carrier (…). Figure 3 (Not shown in the diagram) Uplink transmit chain switching between the second frequency bands, or both. See reference Figure 2 As described in Table 1-3, UE 115 can support up to three uplink transmit chain configurations. The carrier switching timeline 300 illustrates the timeline for UE 115 to perform the switching between transmissions on the first uplink carrier and transmissions on the second uplink carrier, which includes the uplink switching period 315 and other delays and time periods.

[0137] Carrier switching timeline 300 illustrates communication across three time slots 310. In some examples, time slot 310 may represent a sub-time slot or another TTI. UE 115 may perform a first uplink transmission on the first carrier (carrier 1) in time slot 310-a. UE 115 may switch from the first carrier to the second carrier (carrier 2) to perform a second uplink transmission in time slot 310-b. UE 115 may subsequently switch back to the first carrier to perform a third uplink transmission in time slot 310-c. In some examples, UE 115 may operate according to a transmit chain configuration that supports concurrent transmission on the first and second carriers. For example, if UE 115's first transmit chain is active on the first carrier and UE 115's second transmit chain is active on the second carrier, then UE 115 may support simultaneous transmission on each carrier (e.g., on two bands of a band combination). Although carrier switching timeline 300 explains communication across three time slots 310 and two carriers, UE 115 can perform uplink transmission and uplink transmit chain switching on any number of carriers or frequency bands across any number of TTIs.

[0138] Short periods 320 (e.g., short periods 320-a, 320-b, 320-c, and 320-d) can be allocated between each time slot 310 or sub-time slot transmission. In some examples, short periods 320 can be a configured duration (e.g., 10 µs, or some other duration). Short periods 320 can provide time for UE 115 to switch between the first and second carriers, time for UE 115 to switch between the first and second frequency bands, time for UE 115 to switch between transmissions, or any combination thereof.

[0139] UE 115 may be configured with one or more power-on requirements 325 (e.g., power-on requirements 325-a, 325-b, 325-c, and 325-d). If UE 115 transmits a first uplink message on a first carrier in time slot 310-a, power-on requirement 235-a for UE 115 may require UE 115 to open the first transmit chain and maintain the first transmit chain above a power level threshold for the duration of time slot 310-a (e.g., maintain an average power level for each symbol duration in time slot 310-a). Power-on requirement 325-a may end when UE 115 completes the first uplink transmission and a short period 320-a begins. Power-on requirements 325-b and 325-c may represent examples of the start and end of power-on requirements 325 for a second uplink transmission on a second carrier in time slot 310-b. That is, if UE 115 transmits a second uplink message using a second transmit chain on a second carrier, power-on requirement 325-b may instruct UE 115 to turn on the second transmit chain and maintain the second transmit chain at or above a power level threshold until power-on requirement 325-c ends. Power-on requirement 325-c may end when UE 115 completes the second uplink transmission and the short period 320-c begins.

[0140] UE 115 can perform uplink transmit chain handover during handover periods 315-a and 315-b (which may be referred to as uplink handover period 315). See reference... Figure 2 As described, UE 115 may support one or more duration-based uplink handover periods 315. In some examples, the first uplink handover period 315 may support handover between one transmit chain on one of the first or second carriers and two transmit chains on the other carrier (or vice versa) (e.g., 1Tx-2Tx). If UE 115 is configured to support a third transmit chain configuration (Case 3) (as described with reference to Tables 1-3), then UE 115 may support handover between two transmit chains on the first carrier and two transmit chains on the second carrier (or vice versa) (e.g., 2Tx-2Tx). In some examples, a transmit chain may refer to an active transmit chain or several antenna ports configured to transmit on a corresponding carrier or frequency band.

[0141] UE 115 may transmit a UE capability report to base station 105, indicating one or more uplink handover periods 315 supported by UE 115. UE 115 and base station 105 may select the uplink handover period to be used for communication from the one or more reported uplink handover periods. Accordingly, in the example of carrier handover timeline 300, uplink handover periods 315-a, 315-b, or both may be based on a reference... Figure 2One or more of the described selection options are chosen from one or more reported uplink handover periods 315. In some examples, the selected uplink handover period 315 may remain constant within a time period (e.g., a configured number of transmit chain handovers), regardless of whether UE 115 switches one transmit chain from the first carrier to the second carrier, or switches two transmit chains from the first carrier to the second carrier, or vice versa, during uplink handover period 315-a. For example, each of uplink handover periods 315-a and 315-b may be of the same duration, regardless of which transmit chain configuration handover UE 115 performs during the respective uplink handover period 315. Additionally or alternatively, UE 115 and base station 105 may dynamically select the uplink handover period 315 for each scheduled uplink transmission.

[0142] In some examples, UE 115 can be configured to transmit (as referenced) Figure 2 The PUSCH preparation time is calculated before each of the first, second, and third uplink messages (as described). Each PUSCH preparation time may include a corresponding uplink handover period 315-a or 315-b. For example, the first PUSCH preparation time may be configured for UE 115 to prepare for a second uplink transmission in time slot 310-b. The first PUSCH preparation time may be calculated according to Equation 2 or some other equation and may include the selected uplink handover period 315-a. The second PUSCH preparation time may be configured for UE 115 to prepare for a third uplink transmission in time slot 310-c. The second PUSCH preparation time may be calculated according to Equation 2 and may include the selected uplink handover period 315-b. In some examples, the first and second PUSCH preparation times may be configured for UE 115 regardless of whether UE 115 supports uplink transmit chain handover. If UE 115 does not support uplink transmit chain handover, the PUSCH preparation time may not include the uplink handover period 315.

[0143] UE 115 can thus perform uplink carrier handover and transmit chain handover according to carrier handover timeline 300. UE 115 can report UE capabilities supporting one or more uplink handover periods 315. UE 115 can perform uplink transmit chain handover during one or more uplink handover periods 315 selected from the reported uplink handover periods 315.

[0144] Figure 4Examples of a process flow 400 supporting transmit chain handover preparation time for an uplink shared channel, according to various aspects of this disclosure, are described. Process flow 400 may implement, or be implemented by, aspects of wireless communication system 100 or 200 or carrier handover timeline 300. For example, process flow 400 may include UE 115-b and base station 105-b, which may be as described in reference... Figure 1-3 Examples of UE 115 and base station 105 are described. In some examples, UE 115-b may transmit UE capability messages to indicate two uplink handover capabilities supported by UE 115-b.

[0145] It will be understood that the devices and nodes described by process flow 400 may communicate or couple with other devices or nodes not described. For example, UE 115-b and base station 105-b may communicate with one or more other UE 115, base station 105, or other devices. The following alternative examples may be implemented, some of which may be performed in a different order than described or not at all. In some cases, the steps may include additional features not mentioned below, or further steps may be added.

[0146] At 405, UE 115-b can transmit a UE capability message to base station 105-b. The UE capability message can indicate UE capabilities supporting both a first uplink handover period and a second uplink handover period for transmit chain handover. The first uplink handover period and the second uplink handover period can each correspond to different handover periods associated with configuration handover between different transmit chain configurations of the UE.

[0147] At 410, UE 115-b and base station 105-b can select an uplink handover period from a first uplink handover period and a second uplink handover period. In some examples, UE 115-b and base station 105-b can select a maximum duration from a first duration corresponding to the first uplink handover period and a second duration corresponding to the second uplink handover period, and the selected uplink handover period may include the maximum duration. In other examples, UE 115-b and base station 105-b can select the uplink handover period based on a second UE capability that indicates that UE 115-b supports at most single-antenna port transmission or dual-antenna port transmission on a frequency band of a frequency band combination configured for uplink transmit chain handover. In other examples, base station 105-b may transmit a control signal to UE 115-b indicating an uplink handover period, or UE 115-b and base station 105-b may select an uplink handover period based on a handover period associated with a configuration handover between a first transmit chain configuration associated with scheduled uplink data messages and a second transmit chain configuration of UE 115-b.

[0148] At 415, UE 115-b may transmit the uplink data message to base station 105-b after a preparation time based on the uplink handover period. In some examples, the preparation time may be based on a PUSCH preparation time that includes the uplink handover period.

[0149] Figure 5 A block diagram 500 of an apparatus 505 supporting transmit chain handover preparation time for uplink shared channels according to various aspects of this disclosure is shown. Apparatus 505 may be an example of various aspects of UE 115 as described herein. Apparatus 505 may include a receiver 510, a transmitter 515, and a communications manager 520. Apparatus 505 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0150] Receiver 510 may provide means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to transmit chain switching preparation time for uplink shared channels). The information may be transmitted to other components of device 505. Receiver 510 may utilize a single antenna or a collection of multiple antennas.

[0151] Transmitter 515 may provide means for transmitting signals generated by other components of device 505. For example, transmitter 515 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to transmit chain switching preparation time for uplink shared channels). In some examples, transmitter 515 may be co-located with receiver 510 in a transceiver module. Transmitter 515 may utilize a single antenna or a collection of multiple antennas.

[0152] Communication manager 520, receiver 510, transmitter 515, or various combinations thereof, or various components thereof, may be examples of means for performing various aspects of transmit chain switching preparation time for uplink shared channel as described herein. For example, communication manager 520, receiver 510, transmitter 515, or various combinations thereof, or components thereof, may support methods for performing one or more functions described herein.

[0153] In some examples, the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuitry system). This hardware may include a processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, configured to serve as or otherwise support means for performing the functions described herein. In some examples, the processor and memory coupled to the processor may be configured to perform one or more functions described herein (e.g., by executing instructions stored in memory by the processor).

[0154] Additionally or alternatively, in some examples, the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be implemented by code executed by a processor (e.g., as communication management software or firmware). If implemented by code executed by a processor, the functionality of the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be performed by a general-purpose processor, DSP, central processing unit (CPU), ASIC, FPGA, or any combination of these or other programmable logic devices (e.g., means configured or otherwise supported for performing the functions described in this disclosure).

[0155] In some examples, the communication manager 520 may be configured to use or otherwise cooperate with the receiver 510, transmitter 515, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, the communication manager 520 may receive information from the receiver 510, send information to the transmitter 515, or be integrated with the receiver 510, transmitter 515, or both to receive information, transmit information, or perform various other operations described herein.

[0156] Communication manager 520 may support wireless communication at the UE according to examples disclosed herein. For example, communication manager 520 may be configured or otherwise support means for transmitting a UE capability message indicating UE capability supporting both a first uplink switching period and a second uplink switching period for transmit chain switching, wherein the first uplink switching period and the second uplink switching period each correspond to different switching periods associated with configuration switching between different transmit chain configurations of the UE. Communication manager 520 may be configured or otherwise support means for selecting an uplink switching period from the first uplink switching period and the second uplink switching period. Communication manager 520 may be configured or otherwise support means for transmitting uplink data messages after a preparation time based on the uplink switching period.

[0157] By including or configuring a communication manager 520 according to examples as described herein, device 505 (e.g., a processor that controls or otherwise couples to receiver 510, transmitter 515, communication manager 520, or combinations thereof) can support techniques for reducing processing and power consumption. Device 505 may support two or more uplink switching periods for uplink transmit chain switching. The processor of device 505 may perform transmit chain switching within these two or more uplink switching periods. In some examples, the processor of device 505 may transmit a UE capability report to indicate one or more of the uplink switching periods currently supported by device 505. By indicating which uplink switching periods are supported, the processor can ensure that sufficient uplink switching periods are configured, which can reduce latency and processing. In some examples, the processor may support relatively short switching periods, which can reduce latency and power consumption.

[0158] Figure 6 A block diagram 600 of a device 605 supporting transmit chain handover preparation time for uplink shared channels according to various aspects of this disclosure is shown. Device 605 may be an example of a device 505 or a UE 115 as described herein. Device 605 may include a receiver 610, a transmitter 615, and a communication manager 620. Device 605 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0159] Receiver 610 may provide means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to transmit chain switching preparation time for uplink shared channels). The information may be transmitted to other components of device 605. Receiver 610 may utilize a single antenna or a collection of multiple antennas.

[0160] Transmitter 615 may provide means for transmitting signals generated by other components of device 605. For example, transmitter 615 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to transmit chain switching preparation time for uplink shared channels). In some examples, transmitter 615 may be co-located with receiver 610 in a transceiver module. Transmitter 615 may utilize a single antenna or a collection of multiple antennas.

[0161] Device 605 or its various components may be examples of means for performing various aspects of transmit chain handover preparation time for uplink shared channels as described herein. For example, communication manager 620 may include UE capability message component 625, uplink handover period selection component 630, uplink data message component 635, or any combination thereof. Communication manager 620 may be examples of various aspects of communication manager 520 as described herein. In some examples, communication manager 620 or its various components may be configured to use or otherwise cooperate with receiver 610, transmitter 615, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, communication manager 620 may receive information from receiver 610, send information to transmitter 615, or be integrated in combination with receiver 610, transmitter 615, or both to receive information, transmit information, or perform various other operations described herein.

[0162] Communication manager 620 can support wireless communication at the UE according to the examples disclosed herein. UE capability message component 520 can be configured or otherwise supported to support means for transmitting a UE capability message indicating UE capability supporting both a first uplink switching period and a second uplink switching period for transmit chain switching, wherein the first uplink switching period and the second uplink switching period each correspond to different switching periods associated with configuration switching between different transmit chain configurations of the UE. Uplink switching period selection component 630 can be configured or otherwise supported to support means for selecting an uplink switching period from the first uplink switching period and the second uplink switching period. Uplink data message component 635 can be configured or otherwise supported to support means for transmitting uplink data messages after a preparation time based on the uplink switching period.

[0163] Figure 7 A block diagram 700 is shown of a communication manager 720 supporting transmit link handover preparation time for uplink shared channel according to various aspects of this disclosure. The communication manager 720 may be an example of a communication manager 520, a communication manager 620, or aspects thereof as described herein. The communication manager 720 or its various components may be examples of means for performing various aspects of transmit link handover preparation time for uplink shared channel as described herein. For example, the communication manager 720 may include a UE capability message component 725, an uplink handover period selection component 730, an uplink data message component 735, a PUSCH preparation time component 740, an antenna port capability component 745, a control signal receiving component 750, a transmit link handover component 755, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0164] The communication manager 720 can support wireless communication at the UE according to the examples disclosed herein. The UE capability message component 725 can be configured or otherwise supported to support means for transmitting a UE capability message indicating UE capabilities supporting both a first uplink switching period and a second uplink switching period for transmit chain switching, wherein the first and second uplink switching periods each correspond to different switching periods associated with configuration switching between different transmit chain configurations of the UE. The uplink switching period selection component 730 can be configured or otherwise supported to support means for selecting an uplink switching period from the first and second uplink switching periods. The uplink data message component 735 can be configured or otherwise supported to support means for transmitting uplink data messages after a preparation time based on the uplink switching period.

[0165] In some examples, in order to support the transmission of UE capability messages, the UE capability message component 725 may be configured or otherwise support means for transmitting UE capability messages including a first uplink handover period parameter and a second uplink handover period parameter, the first uplink handover period parameter being configured to indicate UE capability supporting a first uplink handover period and the second uplink handover period parameter being configured to indicate UE capability supporting a second uplink handover period.

[0166] In some examples, the uplink handover period selection component 730 may be configured or otherwise supported to provide means for selecting a first uplink handover period supported by the UE from a first configured uplink handover period set corresponding to a first uplink handover period parameter. In some examples, the uplink handover period selection component 730 may be configured or otherwise supported to provide means for selecting a second uplink handover period supported by the UE from a second configured uplink handover period set corresponding to a second uplink handover period parameter.

[0167] In some examples, the PUSCH preparation time component 740 may be configured or otherwise support means for determining the PUSCH preparation time based on the uplink switching period, wherein the PUSCH preparation time includes the uplink switching period, and wherein the preparation time is based on the PUSCH preparation time.

[0168] In some examples, to support the selection of uplink switching periods, the uplink switching period selection component 730 may be configured or otherwise supported to allow for the selection of the maximum duration from a first duration corresponding to a first uplink switching period and a second duration corresponding to a second uplink switching period, wherein the uplink switching period includes the maximum duration.

[0169] In some examples, the antenna port capability component 745 may be configured or otherwise support means for transmitting a second UE capability indicating that the UE supports single-antenna port transmission or dual-antenna port transmission on a frequency band configured for transmit chain switching.

[0170] In some examples, to support the selection of uplink handover periods, the uplink handover period selection component 730 may be configured or otherwise support means for selecting uplink handover periods based on a second UE capability, wherein the first uplink handover period is associated with single-antenna port transmission on the band of the band combination, and the second uplink handover period is associated with dual-antenna port transmission on the band of the band combination.

[0171] In some examples, the control signal receiving component 750 may be configured or otherwise supported for means of receiving a control signal indicating a first uplink switching period or a second uplink switching period, wherein the selection of the uplink switching period is based on the control signal.

[0172] In some examples, the control signal receiving component 750 may be configured or otherwise supported to provide means for receiving control signals that schedule the transmission of uplink data messages according to a first transmit chain configuration, wherein the uplink switching period corresponds to a switching period associated with a configuration switch between the first transmit chain configuration and the second transmit chain configuration of the UE.

[0173] In some examples, the UE capability message component 725 may be configured or otherwise supported to support means for determining whether the UE supports a first transmission chain and a second transmission chain, the first transmission chain and the second transmission chain being variably configured for single-port transmission, dual-port transmission or no transmission on each of the first carrier and the second carrier, wherein the transmission of the UE capability message is based on this determination.

[0174] In some examples, the first uplink handover period supports a handover period associated with a configuration switch between a first transmit chain configuration supporting single-port transmission on a first carrier and a second transmit chain configuration supporting dual-port transmission on a second carrier. In some examples, the first uplink handover period supports a handover period associated with a configuration switch between a first transmit chain configuration supporting dual-port transmission on a first carrier and a second transmit chain configuration supporting single-port transmission on a second carrier.

[0175] In some examples, the second uplink switching period supports a switching period associated with a configuration switch between a first transmit chain configuration that supports dual-port transmission on a first carrier and a second transmit chain configuration that supports dual-port transmission on a second carrier.

[0176] In some examples, to support the transmission of uplink data messages, the uplink data message component 735 may be configured or otherwise supported to support means for transmitting a first uplink data message on a first carrier. In some examples, to support the transmission of uplink data messages, the transmit chain switching component 755 may be configured or otherwise supported to support means for switching at least one of a first transmit chain or a second transmit chain between a first carrier and a second carrier during a preparation time. In some examples, to support the transmission of uplink data messages, the uplink data message component 735 may be configured or otherwise supported to support means for transmitting uplink data messages on a second carrier according to the switching.

[0177] Figure 8 A diagram of a system 800 including device 805 supporting transmit link handover preparation time for uplink shared channel, according to various aspects of this disclosure, is shown. Device 805 may be an example of device 505, device 605, or UE 115 as described herein, or a component including such devices. Device 805 may wirelessly communicate with one or more base stations 105, UE 115, or any combination thereof. Device 805 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communication manager 820, an input / output (I / O) controller 810, a transceiver 815, an antenna 825, a memory 830, a code 835, and a processor 840. These components may be in electronic communication or otherwise coupled (e.g., operational ground, communication ground, functional ground, electronic ground, electrical ground) via one or more buses (e.g., bus 845).

[0178] I / O controller 810 manages the input and output signals of device 805. I / O controller 810 can also manage peripheral devices not integrated into device 805. In some cases, I / O controller 810 may represent a physical connection or port to an external peripheral device. In some cases, I / O controller 810 may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX®, or another known operating system. Additionally or alternatively, I / O controller 810 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, I / O controller 810 may be implemented as part of a processor (such as processor 840). In some cases, a user may interact with device 805 via I / O controller 810 or via hardware components controlled by I / O controller 810.

[0179] In some cases, device 805 may include a single antenna 825. However, in other cases, device 805 may have more than one antenna 825, which may be capable of transmitting or receiving multiple wireless transmissions concurrently. Transceiver 815 may communicate bidirectionally via one or more antennas 825, wired or wireless links, as described herein. For example, transceiver 815 may represent a wireless transceiver and be capable of bidirectional communication with another wireless transceiver. Transceiver 815 may also include a modem for modulating packets and providing modulated packets to one or more antennas 825 for transmission, and for demodulating packets received from one or more antennas 825. Transceiver 815, or transceiver 815 and one or more antennas 825, may be an example of transmitter 515, transmitter 615, receiver 510, receiver 610, or any combination thereof or components thereof as described herein.

[0180] Memory 830 may include random access memory (RAM) and read-only memory (ROM). Memory 830 may store computer-readable, computer-executable code 835, including instructions that, when executed by processor 840, cause device 805 to perform the various functions described herein. Code 835 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, code 835 may not be directly executed by processor 840, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, memory 830 may, in particular, include a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0181] Processor 840 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 840 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 840. Processor 840 may be configured to execute computer-readable instructions stored in memory (e.g., memory 830) to cause device 805 to perform various functions (e.g., functions or tasks supporting transmit chain switching preparation time for uplink shared channels). For example, device 805 or components thereof may include processor 840 and memory 830 coupled to processor 840, wherein processor 840 and memory 830 are configured to perform the various functions described herein.

[0182] The communication manager 820 may support wireless communication at the UE according to the examples disclosed herein. For example, the communication manager 820 may be configured or otherwise support means for transmitting a UE capability message indicating UE capability supporting both a first uplink switching period and a second uplink switching period for transmit chain switching, wherein the first uplink switching period and the second uplink switching period each correspond to different switching periods associated with configuration switching between different transmit chain configurations of the UE. The communication manager 820 may be configured or otherwise support means for selecting an uplink switching period from the first uplink switching period and the second uplink switching period. The communication manager 820 may be configured or otherwise support means for transmitting uplink data messages after a preparation time based on the uplink switching period.

[0183] By including or configuring a communication manager 820 according to the examples described herein, device 805 can support techniques for improved communication reliability, reduced latency, and improved inter-device coordination. Device 805 can support transmit chain handover between multiple transmit chain configurations. Device 805 can transmit UE capability reports to indicate support for one or more uplink handover periods for transmit chain handover. Device 805 and another device (e.g., base station 105) can select an uplink handover period from the reported uplink handover periods based on one or more configured procedures, which can provide improved inter-device coordination and improved communication reliability. By selecting an uplink handover period from the reported uplink handover periods, device 805 can support reduced latency. For example, device 805 can support relatively short uplink handover periods.

[0184] In some examples, the communication manager 820 may be configured to use or otherwise coordinate with transceiver 815, one or more antennas 825, or any combination thereof to perform various operations (e.g., receiving, monitoring, transmitting). Although the communication manager 820 is described as a separate component, in some examples, one or more functions described with reference to the communication manager 820 may be supported or performed by processor 840, memory 830, code 835, or any combination thereof. For example, code 835 may include instructions that may be executed by processor 840 to cause device 805 to perform various aspects of transmit chain switching preparation time for uplink shared channel as described herein, or processor 840 and memory 830 may be otherwise configured to perform or support such operations.

[0185] Figure 9 A block diagram 900 of an apparatus 905 supporting transmit chain handover preparation time for uplink shared channels according to various aspects of this disclosure is shown. Apparatus 905 may be an example of various aspects of base station 105 as described herein. Apparatus 905 may include a receiver 910, a transmitter 915, and a communication manager 920. Apparatus 905 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0186] Receiver 910 may provide means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to transmit chain switching preparation time for uplink shared channels). The information may be transmitted to other components of device 905. Receiver 910 may utilize a single antenna or a collection of multiple antennas.

[0187] Transmitter 915 may provide means for transmitting signals generated by other components of device 905. For example, transmitter 915 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to transmit chain switching preparation time for uplink shared channels). In some examples, transmitter 915 may be co-located with receiver 910 in a transceiver module. Transmitter 915 may utilize a single antenna or a collection of multiple antennas.

[0188] The communication manager 920, receiver 910, transmitter 915, or various combinations thereof, or various components thereof, may be examples of means for performing various aspects of the transmit link switching preparation time for uplink shared channel as described herein. For example, the communication manager 920, receiver 910, transmitter 915, or various combinations thereof, or components thereof, may support methods for performing one or more functions described herein.

[0189] In some examples, the communication manager 920, receiver 910, transmitter 915, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuitry system). The hardware may include processors, DSPs, ASICs, FPGAs, or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination thereof, configured or otherwise supported for performing the functions described herein. In some examples, the processor and memory coupled to the processor may be configured to perform one or more functions described herein (e.g., by executing instructions stored in memory by the processor).

[0190] Additionally or alternatively, in some examples, the communication manager 920, receiver 910, transmitter 915, or various combinations or components thereof may be implemented by code executed by a processor (e.g., as communication management software or firmware). If implemented by code executed by a processor, the functionality of the communication manager 920, receiver 910, transmitter 915, or various combinations or components thereof may be performed by a general-purpose processor, DSP, CPU, ASIC, FPGA, or any combination of these or other programmable logic devices (e.g., means configured or otherwise supported for performing the functions described in this disclosure).

[0191] In some examples, the communication manager 920 may be configured to use or otherwise cooperate with the receiver 910, transmitter 915, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, the communication manager 920 may receive information from the receiver 910, send information to the transmitter 915, or be integrated with the receiver 910, transmitter 915, or both to receive information, transmit information, or perform various other operations described herein.

[0192] According to the examples disclosed herein, the communication manager 920 may support wireless communication at a base station. For example, the communication manager 920 may be configured or otherwise support means for receiving a UE capability message from a UE, the UE capability message indicating UE capabilities supporting both a first uplink handover period and a second uplink handover period for transmit chain handover, wherein the first uplink handover period and the second uplink handover period each correspond to different handover periods associated with configuration handover between different transmit chain configurations of the UE. The communication manager 920 may be configured or otherwise support means for selecting an uplink handover period from the first uplink handover period and the second uplink handover period. The communication manager 920 may be configured or otherwise support means for receiving uplink data messages from the UE after a preparation time based on the uplink handover period.

[0193] Figure 10 A block diagram 1000 of an apparatus 1005 supporting transmit chain handover preparation time for uplink shared channels according to various aspects of this disclosure is shown. Apparatus 1005 may be an example of an apparatus 905 as described herein or an aspect of a base station 105. Apparatus 1005 may include a receiver 1010, a transmitter 1015, and a communication manager 1020. Apparatus 1005 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0194] Receiver 1010 may provide means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to transmit chain switching preparation time for uplink shared channels). The information may be transmitted to other components of device 1005. Receiver 1010 may utilize a single antenna or a collection of multiple antennas.

[0195] Transmitter 1015 may provide means for transmitting signals generated by other components of device 1005. For example, transmitter 1015 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to transmit chain switching preparation time for uplink shared channels). In some examples, transmitter 1015 may be co-located with receiver 1010 in a transceiver module. Transmitter 1015 may utilize a single antenna or a collection of multiple antennas.

[0196] Device 1005 or its various components may be examples of means for performing various aspects of the transmit chain handover preparation time for uplink shared channel as described herein. For example, communication manager 1020 may include UE capability message component 1025, uplink handover period component 1030, uplink data message receiving component 1035, or any combination thereof. Communication manager 1020 may be examples of various aspects of communication manager 920 as described herein. In some examples, communication manager 1020 or its various components may be configured to use or otherwise cooperate with receiver 1010, transmitter 1015, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, communication manager 1020 may receive information from receiver 1010, send information to transmitter 1015, or be integrated with receiver 1010, transmitter 1015, or both to receive information, transmit information, or perform various other operations described herein.

[0197] According to the examples disclosed herein, the communication manager 1020 may support wireless communication at a base station. The UE capability message component 1025 may be configured or otherwise supported to support means for receiving a UE capability message from a UE, the UE capability message indicating UE capabilities supporting both a first uplink switching period and a second uplink switching period for transmit chain switching, wherein the first uplink switching period and the second uplink switching period each correspond to different switching periods associated with configuration switching between different transmit chain configurations of the UE. The uplink switching period component 1030 may be configured or otherwise supported to support means for selecting an uplink switching period from the first uplink switching period and the second uplink switching period. The uplink data message receiving component 1035 may be configured or otherwise supported to support means for receiving uplink data messages from the UE after a preparation time based on the uplink switching period.

[0198] Figure 11 A block diagram 1100 is shown of a communication manager 1120 supporting transmit chain handover preparation time for uplink shared channel according to various aspects of this disclosure. Communication manager 1120 may be an example of communication manager 920, communication manager 1020, or aspects thereof described herein. Communication manager 1120 or its various components may be examples of means for performing various aspects of transmit chain handover preparation time for uplink shared channel as described herein. For example, communication manager 1120 may include UE capability message component 1125, uplink handover period component 1130, uplink data message reception component 1135, PUSCH preparation time component 1140, antenna port capability component 1145, control signal transmission component 1150, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0199] According to the examples disclosed herein, the communication manager 1120 may support wireless communication at a base station. The UE capability message component 1125 may be configured or otherwise supported to support means for receiving a UE capability message from a UE, the UE capability message indicating UE capabilities supporting both a first uplink handover period and a second uplink handover period for transmit chain handover, wherein the first uplink handover period and the second uplink handover period each correspond to different handover periods associated with configuration handover between different transmit chain configurations of the UE. The uplink handover period component 1130 may be configured or otherwise supported to support means for selecting an uplink handover period from the first uplink handover period and the second uplink handover period. The uplink data message receiving component 1135 may be configured or otherwise supported to support means for receiving uplink data messages from the UE after a preparation time based on the uplink handover period.

[0200] In some examples, in order to support receiving UE capability messages, the UE capability message component 1125 may be configured or otherwise supported for receiving means of receiving UE capability messages including a first uplink handover period parameter and a second uplink handover period parameter, the first uplink handover period parameter being configured to indicate UE capability supporting a first uplink handover period and the second uplink handover period parameter being configured to indicate UE capability supporting a second uplink handover period.

[0201] In some examples, the first uplink handover period supported by the UE is selected from a first configured uplink handover period set corresponding to the first uplink handover period parameter. In some examples, the second uplink handover period supported by the UE is selected from a second configured uplink handover period set corresponding to the second uplink handover period parameter.

[0202] In some examples, the PUSCH preparation time component 1140 may be configured or otherwise support means for determining the PUSCH preparation time based on the uplink switching period, wherein the PUSCH preparation time includes the uplink switching period, and wherein the preparation time is based on the PUSCH preparation time.

[0203] In some examples, to support the selection of uplink switching periods, the uplink switching period component 1130 may be configured or otherwise supported to support means for selecting the maximum duration from a first duration corresponding to a first uplink switching period and a second duration corresponding to a second uplink switching period, wherein the uplink switching period includes the maximum duration.

[0204] In some examples, antenna port capability component 1145 may be configured or otherwise support means for receiving a second UE capability indicating that the UE supports single-antenna port transmission or dual-antenna port transmission on a frequency band of a frequency band configured for transmit chain switching.

[0205] In some examples, to support the selection of uplink handover periods, the uplink handover period component 1130 may be configured or otherwise support means for selecting uplink handover periods based on a second UE capability, wherein the first uplink handover period is associated with single-antenna port transmission on a frequency band of the frequency band combination, and the second uplink handover period is associated with dual-antenna port transmission on a frequency band of the frequency band combination.

[0206] In some examples, the control signal transmission component 1150 may be configured or otherwise supported to transmit means for transmitting a control signal indicating a first uplink switching period or a second uplink switching period, wherein the selection of the uplink switching period is based on the control signal.

[0207] In some examples, the control signal transmission component 1150 may be configured or otherwise support means for transmitting control signals for scheduling the transmission of uplink data messages according to a first transmit chain configuration, wherein the uplink switching period corresponds to a switching period associated with a configuration switch between the first transmit chain configuration and the UE's second transmit chain configuration.

[0208] In some examples, the UE capability message component 1125 may be configured or otherwise supported to support means for determining whether the UE supports a first transmission chain and a second transmission chain, which may be configured differently for single-port transmission, dual-port transmission, or no transmission on each of the first and second carriers, wherein receiving the UE capability message is based on this determination.

[0209] In some examples, the first uplink handover period supports a handover period associated with a configuration switch between a first transmit chain configuration supporting single-port transmission on a first carrier and a second transmit chain configuration supporting dual-port transmission on a second carrier. In some examples, the first uplink handover period supports a handover period associated with a configuration switch between a first transmit chain configuration supporting dual-port transmission on a first carrier and a second transmit chain configuration supporting single-port transmission on a second carrier.

[0210] In some examples, the second uplink switching period supports a switching period associated with a configuration switch between a first transmit chain configuration that supports dual-port transmission on a first carrier and a second transmit chain configuration that supports dual-port transmission on a second carrier.

[0211] In some examples, to support the reception of uplink data messages, the uplink data message receiving component 1135 may be configured or otherwise supported to support means for receiving a first uplink data message on a first carrier. In some examples, to support the reception of uplink data messages, the uplink data message receiving component 1135 may be configured or otherwise supported to support means for receiving uplink data messages on a second carrier after a preparation time.

[0212] Figure 12A diagram of a system 1200 including device 1205 supporting transmit link handover preparation time for uplink shared channels, according to various aspects of this disclosure, is shown. Device 1205 may be an example of device 905, device 1005, or base station 105 as described herein, or a component including such devices. Device 1205 may wirelessly communicate with one or more base stations 105, UE 115, or any combination thereof. Device 1205 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communication manager 1220, a network communication manager 1210, a transceiver 1215, an antenna 1225, a memory 1230, code 1235, a processor 1240, and an inter-station communication manager 1245. These components may be in electronic communication or otherwise coupled (e.g., operational ground, communication ground, functional ground, electronic ground, electrical ground) via one or more buses (e.g., bus 1250).

[0213] The network communication manager 1210 can manage communication with the core network 130 (e.g., via one or more wired backhaul links). For example, the network communication manager 1210 can manage the delivery of data communication to client devices (such as one or more UEs 115).

[0214] In some cases, device 1205 may include a single antenna 1225. However, in other cases, device 1205 may have more than one antenna 1225, which may be capable of transmitting or receiving multiple wireless transmissions concurrently. Transceiver 1215 may communicate bidirectionally via one or more antennas 1225, wired or wireless links, as described herein. For example, transceiver 1215 may represent a wireless transceiver and be capable of bidirectional communication with another wireless transceiver. Transceiver 1215 may also include a modem for modulating packets and providing modulated packets to one or more antennas 1225 for transmission, and for demodulating packets received from one or more antennas 1225. Transceiver 1215 or transceiver 1215 and one or more antennas 1225 may be examples of transmitter 915, transmitter 1015, receiver 910, receiver 1010 or any combination thereof or components thereof as described herein.

[0215] Memory 1230 may include RAM and ROM. Memory 1230 may store computer-readable, computer-executable code 1235, including instructions that, when executed by processor 1240, cause device 1205 to perform the various functions described herein. Code 1235 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, code 1235 may not be directly executable by processor 1240, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, memory 1230 may, in particular, include a BIOS that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0216] Processor 1240 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1240 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 1240. Processor 1240 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1230) to cause device 1205 to perform various functions (e.g., functions or tasks supporting transmit chain switching preparation time for uplink shared channels). For example, device 1205 or components thereof may include processor 1240 and memory 1230 coupled to processor 1240, wherein processor 1240 and memory 1230 are configured to perform the various functions described herein.

[0217] Inter-site communication manager 1245 manages communication with other base stations 105 and may include a controller or scheduler for cooperating with other base stations 105 to control communication with UE 115. For example, inter-site communication manager 1245 may coordinate the scheduling of transmissions to UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, inter-site communication manager 1245 may provide an X2 interface within LTE / LTE-A wireless communication network technology to facilitate communication between base stations 105.

[0218] According to the examples disclosed herein, the communication manager 1220 may support wireless communication at a base station. For example, the communication manager 1220 may be configured or otherwise support means for receiving a UE capability message from a UE, the UE capability message indicating UE capability supporting both a first uplink handover period and a second uplink handover period for transmit chain handover, wherein the first uplink handover period and the second uplink handover period each correspond to different handover periods associated with configuration handover between different transmit chain configurations of the UE. The communication manager 1220 may be configured or otherwise support means for selecting an uplink handover period from the first uplink handover period and the second uplink handover period. The communication manager 1220 may be configured or otherwise support means for receiving uplink data messages from the UE after a preparation time based on the uplink handover period.

[0219] In some examples, the communication manager 1220 may be configured to use or otherwise coordinate with transceiver 1215, one or more antennas 1225, or any combination thereof to perform various operations (e.g., receiving, monitoring, transmitting). Although the communication manager 1220 is described as a separate component, in some examples, one or more functions described with reference to the communication manager 1220 may be supported or performed by processor 1240, memory 1230, code 1235, or any combination thereof. For example, code 1235 may include instructions that can be executed by processor 1240 to cause device 1205 to perform various aspects of transmit chain switching preparation time for uplink shared channel as described herein, or processor 1240 and memory 1230 may be otherwise configured to perform or support such operations.

[0220] Figure 13 A flowchart illustrating a method 1300 for transmit chain handover preparation time for uplink shared channels, according to various aspects of this disclosure, is shown. Operation of method 1300 can be implemented by a UE or its components as described herein. For example, operation of method 1300 can be implemented by, as referred to... Figures 1 to 8 The UE 115 described herein is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described function.

[0221] At 1305, the method may include transmitting a UE capability message indicating UE capabilities supporting both a first uplink handover period and a second uplink handover period for transmit chain switching, wherein the first uplink handover period and the second uplink handover period each correspond to different handover periods associated with configuration switching between different transmit chain configurations of the UE. Operation of 1305 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1305 may be provided by reference to... Figure 7 The UE capability message component 725 described herein is used to perform this action.

[0222] In 1310, the method may include selecting an uplink switching period from a first uplink switching period and a second uplink switching period. The operation of 1310 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1310 may be provided as referenced. Figure 7 The described uplink switching period is selected by component 730.

[0223] In 1315, the method may include transmitting uplink data messages after a preparation time based on the uplink handover period. The operation of 1315 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1315 may be derived from, as referenced... Figure 7 The described uplink data message component 735 is used to perform this.

[0224] Figure 14 A flowchart illustrating a method 1400 for transmit chain handover preparation time for uplink shared channels, according to various aspects of this disclosure, is shown. Operation of method 1400 can be implemented by a UE or its components as described herein. For example, operation of method 1400 can be implemented by, as referred to... Figures 1 to 8 The UE 115 described herein is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described function.

[0225] At 1405, the method may include transmitting a UE capability message indicating UE capabilities supporting both a first uplink handover period and a second uplink handover period for transmit chain switching, wherein the first uplink handover period and the second uplink handover period each correspond to different handover periods associated with configuration switching between different transmit chain configurations of the UE. Operation of 1405 may be performed according to the examples disclosed herein. In some examples, aspects of operation of 1405 may be provided by reference to... Figure 7 The UE capability message component 725 described herein is used to perform this action.

[0226] At 1410, the method may include selecting an uplink switching period from a first uplink switching period and a second uplink switching period. The operation of 1410 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1410 may be provided as referenced. Figure 7 The described uplink switching period is selected by component 730.

[0227] In 1415, the method may include determining a PUSCH preparation time based on the uplink switching period, wherein the PUSCH preparation time includes the uplink switching period. The operation of 1415 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1415 may be derived from, as referenced... Figure 7 The described PUSCH preparation time component 740 is used for execution.

[0228] At 1420, the method may include transmitting uplink data messages after a preparation time based on the uplink switching period and the PUSCH preparation time. The operation of 1420 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1420 may be derived from references... Figure 7 The described uplink data message component 735 is used to perform this.

[0229] Figure 15 A flowchart illustrating a method 1500 for transmit chain handover preparation time for uplink shared channels, according to various aspects of this disclosure, is shown. Operation of method 1500 can be implemented by a UE or its components as described herein. For example, operation of method 1500 can be implemented by, as described in reference... Figures 1 to 8 The UE 115 described herein is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described function.

[0230] In 1505, the method may include transmitting a UE capability message indicating UE capabilities supporting both a first uplink handover period and a second uplink handover period for transmit chain switching, wherein the first uplink handover period and the second uplink handover period each correspond to different handover periods associated with configuration switching between different transmit chain configurations of the UE. Operation of 1505 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1505 may be provided by reference to... Figure 7 The UE capability message component 725 described herein is used to perform this action.

[0231] In 1510, the method may include transmitting a second UE capability indicating that the UE supports single-antenna-port transmission or dual-antenna-port transmission on a frequency band configured for transmit chain switching. Operation of 1510 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1510 may be provided by reference to... Figure 7 The antenna port capability component 745 is described as performing this function.

[0232] At 1515, the method may include selecting an uplink switching period from a first uplink switching period and a second uplink switching period. The operation of 1515 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1515 may be as described in the references... Figure 7 The described uplink switching period is selected by component 730.

[0233] In 1520, the method may include selecting an uplink handover period based on a second UE capability, wherein a first uplink handover period is associated with single-antenna port transmission on a frequency band of the frequency band combination, and a second uplink handover period is associated with dual-antenna port transmission on a frequency band of the frequency band combination. Operation of 1520 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1520 may be provided by reference to [reference needed]. Figure 7 The described uplink switching period is selected by component 730.

[0234] At 1525, the method may include transmitting uplink data messages after a preparation time based on the uplink handover period. The operation of 1525 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1525 may be derived from, as referenced... Figure 7 The described uplink data message component 735 is used to perform this.

[0235] Figure 16 A flowchart illustrating a method 1600 for transmit link handover preparation time for uplink shared channels, according to various aspects of this disclosure, is shown. Operation of method 1600 can be implemented by a base station or its components as described herein. For example, operation of method 1600 can be implemented by, as referred to... Figures 1 to 4 and Figures 9 to 12 The described base station 105 performs this function. In some examples, the base station can execute a set of instructions to control the functional elements of the base station to perform the described function. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the described function.

[0236] In 1605, the method may include receiving a UE capability message from a UE, the UE capability message indicating UE capabilities supporting both a first uplink handover period and a second uplink handover period for transmit chain handover, wherein the first uplink handover period and the second uplink handover period each correspond to different handover periods associated with configuration handover between different transmit chain configurations of the UE. Operation of 1605 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1605 may be provided by reference to [reference needed]. Figure 11 The UE capability message component 1125 described herein is used to perform this action.

[0237] In 1610, the method may include selecting an uplink switching period from a first uplink switching period and a second uplink switching period. The operation of 1610 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1610 may be provided as referenced. Figure 11 The uplink switching time period component 1130 described herein shall be executed.

[0238] In 1615, the method may include receiving uplink data messages from the UE after a preparation time based on the uplink handover period. Operation of 1615 may be performed according to the examples disclosed herein. In some examples, aspects of operation of 1615 may be derived from references... Figure 11 The uplink data message receiving component 1135 described herein is used to perform this action.

[0239] The following provides an overview of the various aspects of this disclosure: Aspect 1: A method for wireless communication at a UE, comprising: transmitting a UE capability message indicating UE capabilities supporting both a first uplink switching period and a second uplink switching period for transmit chain switching, wherein the first uplink switching period and the second uplink switching period each correspond to different switching periods associated with configuration switching between different transmit chain configurations of the UE; selecting an uplink switching period from the first uplink switching period and the second uplink switching period; and transmitting an uplink data message after a preparation time based at least in part on the uplink switching period.

[0240] Aspect 2: The method of Aspect 1, wherein transmitting the UE capability message further comprises: transmitting the UE capability message including a first uplink switching period parameter and a second uplink switching period parameter, wherein the first uplink switching period parameter is configured to indicate the UE capability supporting the first uplink switching period, and the second uplink switching period parameter is configured to indicate the UE capability supporting the second uplink switching period.

[0241] Aspect 3: The method of aspect 2 further includes: selecting the first uplink switching period supported by the UE from a first configured uplink switching period set corresponding to the first uplink switching period parameter; and selecting the second uplink switching period supported by the UE from a second configured uplink switching period set corresponding to the second uplink switching period parameter.

[0242] Aspect 4: The method of any of Aspects 1 to 3 further includes: determining a physical uplink shared channel preparation time based on the uplink switching period, wherein the physical uplink shared channel preparation time includes the uplink switching period, and wherein the preparation time is at least partially based on the physical uplink shared channel preparation time.

[0243] Aspect 5: The method of any of Aspects 1 to 4, wherein selecting the uplink switching period further comprises: selecting the maximum duration from a first duration corresponding to the first uplink switching period and a second duration corresponding to the second uplink switching period, wherein the uplink switching period includes the maximum duration.

[0244] Aspect 6: The method of any of Aspects 1 to 4 further includes: transmitting a second UE capability indicating that the UE supports single-antenna port transmission or dual-antenna port transmission on a frequency band of a frequency band combination configured for transmit chain switching.

[0245] Aspect 7: The method of aspect 6, wherein selecting the uplink handover period further includes: selecting the uplink handover period at least in part based on the second UE capability, wherein the first uplink handover period is associated with single-antenna port transmission on the band of the band combination, and the second uplink handover period is associated with dual-antenna port transmission on the band of the band combination.

[0246] Aspect 8: The method of aspect 6 further includes: receiving a control signal indicating the first uplink switching period or the second uplink switching period, wherein the selection of the uplink switching period is at least in part based on the control signal.

[0247] Aspect 9: The method of any of Aspects 1 to 4 further includes: receiving a control signal for scheduling the transmission of the uplink data message according to a first transmit chain configuration, wherein the uplink switching period corresponds to a switching period associated with a configuration switching between the first transmit chain configuration and a second transmit chain configuration of the UE.

[0248] Aspect 10: The method of any of Aspects 1 to 9 further includes: determining that the UE supports a first transmission chain and a second transmission chain, the first transmission chain and the second transmission chain being variably configured for single-port transmission, dual-port transmission or no transmission on each of a first carrier and a second carrier, wherein the transmission of the UE capability message is based at least in part on the determination.

[0249] Aspect 11: The method of aspect 10, wherein the first uplink switching period supports a switching period associated with a configuration switching between a first transmit chain configuration supporting single-port transmission on the first carrier and a second transmit chain configuration supporting dual-port transmission on the second carrier.

[0250] Aspect 12: The method of aspect 10, wherein the first uplink switching period supports a switching period associated with a configuration switching between a first transmit chain configuration supporting dual-port transmission on the first carrier and a second transmit chain configuration supporting single-port transmission on the second carrier.

[0251] Aspect 13: The method of any of Aspects 10 to 12, wherein the second uplink switching period supports a switching period associated with a configuration switching between a first transmit chain configuration supporting the dual-port transmission on the first carrier and a second transmit chain configuration supporting the dual-port transmission on the second carrier.

[0252] Aspect 14: The method of any of Aspects 1 to 13, wherein transmitting the uplink data message further comprises: transmitting the first uplink data message on the first carrier; switching at least one of the first transmission chain or the second transmission chain between the first carrier and the second carrier during the preparation time; and transmitting the uplink data message on the second carrier according to the switching.

[0253] Aspect 15: A method for wireless communication at a base station, comprising: receiving a UE capability message from a UE, the UE capability message indicating UE capabilities supporting both a first uplink switching period and a second uplink switching period for transmit chain switching, wherein the first uplink switching period and the second uplink switching period each correspond to different switching periods associated with configuration switching between different transmit chain configurations of the UE; selecting an uplink switching period from the first uplink switching period and the second uplink switching period; and receiving an uplink data message from the UE after a preparation time based at least in part on the uplink switching period.

[0254] Aspect 16: The method of aspect 15, wherein receiving the UE capability message further comprises: receiving the UE capability message including a first uplink handover period parameter and a second uplink handover period parameter, the first uplink handover period parameter being configured to indicate support for the UE capability during the first uplink handover period, and the second uplink handover period parameter being configured to indicate support for the UE capability during the second uplink handover period.

[0255] Aspect 17: The method of aspect 16, wherein the first uplink handover period supported by the UE is selected from a first configured uplink handover period set corresponding to the first uplink handover period parameter; and the second uplink handover period supported by the UE is selected from a second configured uplink handover period set corresponding to the second uplink handover period parameter.

[0256] Aspect 18: The method of any of Aspects 15 to 17 further includes: determining a physical uplink shared channel preparation time based on the uplink switching period, wherein the physical uplink shared channel preparation time includes the uplink switching period, and wherein the preparation time is at least partially based on the physical uplink shared channel preparation time.

[0257] Aspect 19: The method of any of Aspects 15 to 18, wherein selecting the uplink switching period further comprises: selecting the maximum duration from a first duration corresponding to the first uplink switching period and a second duration corresponding to the second uplink switching period, wherein the uplink switching period includes the maximum duration.

[0258] Aspect 20: The method of any of Aspects 15 to 18 further includes: receiving a second UE capability indicating that the UE supports at most single-antenna port transmission or dual-antenna port transmission on a frequency band of a frequency band combination configured for the transmit chain switching.

[0259] Aspect 21: The method of aspect 20, wherein selecting the uplink handover period further comprises: selecting the uplink handover period at least in part based on the second UE capability, wherein the first uplink handover period is associated with single-antenna port transmission on the band of the band combination, and the second uplink handover period is associated with dual-antenna port transmission on the band of the band combination.

[0260] Aspect 22: The method of aspect 20 further includes: transmitting a control signal indicating the first uplink switching period or the second uplink switching period, wherein the selection of the uplink switching period is at least in part based on the control signal.

[0261] Aspect 23: The method of any of Aspects 15 to 18 further includes: transmitting a control signal to schedule the transmission of the uplink data message according to a first transmit chain configuration, wherein the uplink switching period corresponds to a switching period associated with a configuration switching between the first transmit chain configuration and a second transmit chain configuration of the UE.

[0262] Aspect 24: The method of any of Aspects 15 to 23 further includes: determining that the UE supports a first transmission chain and a second transmission chain, the first transmission chain and the second transmission chain being variably configured for single-port transmission, dual-port transmission or no transmission on each of a first carrier and a second carrier, wherein receiving the UE capability message is based at least in part on the determination.

[0263] Aspect 25: The method of aspect 24, wherein the first uplink switching period supports a switching period associated with a configuration switching between a first transmit chain configuration supporting the single-port transmission on the first carrier and a second transmit chain configuration supporting the dual-port transmission on the second carrier.

[0264] Aspect 26: The method of aspect 24, wherein the first uplink switching period supports a switching period associated with a configuration switching between a first transmit chain configuration supporting the dual-port transmission on the first carrier and a second transmit chain configuration supporting the single-port transmission on the second carrier.

[0265] Aspect 27: The method of any of Aspects 24 to 26, wherein the second uplink switching period supports a switching period associated with a configuration switching between a first transmit chain configuration supporting the dual-port transmission on the first carrier and a second transmit chain configuration supporting the dual-port transmission on the second carrier.

[0266] Aspect 28: The method of any of Aspects 15 to 27, wherein receiving the uplink data message further comprises: receiving a first uplink data message on a first carrier; and receiving the uplink data message on a second carrier after the preparation time.

[0267] Aspect 29: An apparatus for wireless communication, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method as described in any of Aspects 1 to 14.

[0268] Aspect 30: An apparatus for wireless communication at a UE, comprising at least one means for performing a method as described in any of Aspects 1 to 14.

[0269] Aspect 31: A non-transient computer-readable medium storing code for wireless communication at a UE, the code including instructions executable by a processor to perform methods as described in any of Aspects 1 to 14.

[0270] Aspect 32: An apparatus for wireless communication, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method as described in any of Aspects 15 to 28.

[0271] Aspect 33: An apparatus for wireless communication at a base station, comprising at least one means for performing the method as described in any of Aspects 15 and 28.

[0272] Aspect 34: A non-transient computer-readable medium storing code for wireless communication at a base station, the code including instructions executable by a processor to perform methods as described in any of Aspects 15 to 28.

[0273] It should be noted that the methods described in this paper describe possible implementations, and the operations and steps can be rearranged or otherwise modified, and other implementations are also possible. Furthermore, aspects from two or more methods can be combined.

[0274] While aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used in most of the description, the techniques described herein can also be applied to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described can be applied to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0275] The information and signals described herein can be represented using any of a wide variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or light particles, or any combination thereof.

[0276] The various illustrative boxes and components described herein can be implemented or executed using a general-purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but in alternatives, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors working in conjunction with a DSP core, or any other such configuration).

[0277] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored or transmitted as one or more instructions or code on a computer-readable medium. Other examples and implementations fall within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Features implementing the functions may also be physically located in various locations, including being distributed such that different parts of the function are implemented at different physical locations.

[0278] Computer-readable media includes both non-transitory computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one location to another. Non-transitory storage media can be any available medium accessible to a general-purpose or special-purpose computer. By way of example and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code in the form of instructions or data structures and is accessible to a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Similarly, any connection is also legitimately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then such coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable media. As used in this article, disk and disc include CDs, laser discs, optical discs, DVDs, floppy disks, and Blu-ray discs, where disks often magnetically reproduce data while discs optically reproduce data using lasers. Combinations of these media are also included within the scope of computer-readable media.

[0279] As used herein (including in the claims), the word "or" in an enumeration of items (e.g., an enumeration of items accompanied by phrases such as "at least one of" or "one or more of") indicates an inclusive enumeration, such that an enumeration of at least one of, for example, A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Similarly, as used herein, the phrase "based on" should not be interpreted as referring to a closed set of conditions. For example, an example step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "at least partially based on".

[0280] The term "determine" or "determine" encompasses a wide variety of actions, and therefore, "determine" can include calculation, computation, processing, derivation, investigation, searching (such as by searching in a table, database, or other data structure), ascertainment, and similar actions. Additionally, "determine" can include receiving (such as receiving information), accessing (such as accessing data in memory), and similar actions. Furthermore, "determine" can include parsing, selecting, choosing, building, and other such similar actions.

[0281] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, components of the same type may be distinguished by a dash following the reference numeral and a second reference numeral used to differentiate between similar components. If only the first reference numeral is used in the description, the description may apply to any of the similar components having the same first reference numeral, regardless of the second reference numeral or other subsequent reference numerals.

[0282] The descriptions herein, illustrated with reference to the accompanying drawings, depict exemplary configurations and are not representative of all examples that may be implemented or fall within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration" and does not imply "superior" or "outperforming" other examples. This detailed description includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0283] The description provided herein is intended to enable those skilled in the art to make or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the universal principles defined herein can be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for performing wireless communication at a user equipment (UE), comprising: A UE capability message is transmitted, indicating UE capabilities supporting both a first uplink handover period for switching between a first pair of transmit chain configurations and a second uplink handover period different from the first uplink handover period and for switching between a second pair of transmit chain configurations, wherein each transmit chain configuration in the first pair of transmit chain configurations and the second pair of transmit chain configurations corresponds to a corresponding configuration of each of the UE's first transmit chain and the UE's second transmit chain on a corresponding component carrier for communication, and wherein the first uplink handover period and the second uplink handover period each correspond to different handover periods based at least in part on a first number of transmit chains as part of the handover between the first pair of transmit chain configurations and a second number of transmit chains as part of the handover between the second pair of transmit chain configurations; as well as According to the UE's first transmit chain configuration, uplink data messages are transmitted after a preparation time based at least in part on an uplink switching period that includes either the first uplink switching period or the second uplink switching period.

2. The method of claim 1, wherein transmitting the UE capability message further comprises: The UE capability message is transmitted, which includes a first uplink handover period parameter and a second uplink handover period parameter. The first uplink handover period parameter is configured to indicate support for the UE capability during the first uplink handover period, and the second uplink handover period parameter is configured to indicate support for the UE capability during the second uplink handover period.

3. The method of claim 2, further comprising: Select the first uplink handover period supported by the UE from the first configured uplink handover period set corresponding to the first uplink handover period parameter; as well as The second uplink handover period supported by the UE is selected from the second configured uplink handover period set corresponding to the second uplink handover period parameter.

4. The method of claim 1, further comprising: The physical uplink shared channel preparation time is determined based on the uplink switching period, wherein the physical uplink shared channel preparation time includes the uplink switching period, and wherein the preparation time is at least partially based on the physical uplink shared channel preparation time.

5. The method of claim 1, wherein selecting the uplink switching period further comprises: The longest duration is selected from a first duration corresponding to the first uplink switching period and a second duration corresponding to the second uplink switching period, wherein the uplink switching period includes the longest duration.

6. The method of claim 1, further comprising: Transmit a second UE capability, which indicates that the UE supports single-antenna port transmission or dual-antenna port transmission on a frequency band configured for transmit chain switching.

7. The method of claim 6, wherein selecting the uplink handover period further comprises: The uplink handover period is selected at least in part based on the second UE capability, wherein the first uplink handover period is associated with single-antenna port transmission on the frequency band of the frequency band combination, and the second uplink handover period is associated with dual-antenna port transmission on the frequency band of the frequency band combination.

8. The method of claim 6, further comprising: Receive a control signal indicating a first uplink switching period or a second uplink switching period, wherein the selection of the uplink switching period is at least in part based on the control signal.

9. The method of claim 1, further comprising: The system receives a control signal to schedule the transmission of the uplink data message according to the first transmit chain configuration, wherein the uplink switching period corresponds to a switching period associated with a configuration switch between the first transmit chain configuration and the second transmit chain configuration of the UE.

10. The method of claim 1, further comprising: It is determined that the UE supports the first transmission chain and the second transmission chain, which can be variably configured for single-port transmission, dual-port transmission, or no transmission on each of the first and second carriers, wherein the transmission of the UE capability message is based at least in part on the determination.

11. The method of claim 10, wherein the first uplink switching period supports a switching period associated with a configuration switching between a first transmit chain configuration supporting the single-port transmission on the first carrier and a second transmit chain configuration supporting the dual-port transmission on the second carrier.

12. The method of claim 10, wherein the first uplink switching period supports a switching period associated with a configuration switching between a first transmit chain configuration supporting dual-port transmission on the first carrier and a second transmit chain configuration supporting single-port transmission on the second carrier.

13. The method of claim 10, wherein the second uplink switching period supports a switching period associated with a configuration switching between a first transmit chain configuration supporting the dual-port transmission on the first carrier and a second transmit chain configuration supporting the dual-port transmission on the second carrier.

14. The method of claim 1, wherein transmitting the uplink data message further comprises: A first uplink data message is transmitted on the first carrier of the respective component carriers used for communication; During the preparation time of the respective component carriers used for communication, at least one of the first transmission chain or the second transmission chain is switched between the first carrier and the second carrier; as well as The uplink data message is transmitted on the second carrier according to the switching.

15. A method for wireless communication at a network device, comprising: Receives a UE capability message from a User Equipment (UE), the UE capability message indicating UE capability supporting both a first uplink handover period for switching between a first pair of transmit chain configurations and a second uplink handover period different from the first uplink handover period and for switching between a second pair of transmit chain configurations, wherein each transmit chain configuration in the first pair of transmit chain configurations and the second pair of transmit chain configurations corresponds to a corresponding configuration of each of the UE's first transmit chain and the UE's second transmit chain on a corresponding component carrier for communication, and wherein the first uplink handover period and the second uplink handover period each correspond to different handover periods based at least in part on a first number of transmit chains as part of the handover between the first pair of transmit chain configurations and a second number of transmit chains as part of the handover between the second pair of transmit chain configurations; as well as According to the UE's first transmit chain configuration, uplink data messages are received from the UE after a preparation time based at least in part on an uplink switching period that includes either the first uplink switching period or the second uplink switching period.

16. The method of claim 15, wherein receiving the UE capability message further comprises: The system receives a UE capability message including a first uplink handover period parameter and a second uplink handover period parameter, wherein the first uplink handover period parameter is configured to indicate support for the UE capability during the first uplink handover period, and the second uplink handover period parameter is configured to indicate support for the UE capability during the second uplink handover period.

17. The method of claim 16, wherein: The first uplink handover period supported by the UE is selected from a first configured uplink handover period set corresponding to the first uplink handover period parameter; and The second uplink handover period supported by the UE is selected from the second configured uplink handover period set corresponding to the second uplink handover period parameter.

18. The method of claim 15, further comprising: The physical uplink shared channel preparation time is determined based on the uplink switching period, wherein the physical uplink shared channel preparation time includes the uplink switching period, and wherein the preparation time is at least partially based on the physical uplink shared channel preparation time.

19. The method of claim 15, wherein selecting the uplink handover period further comprises: The longest duration is selected from a first duration corresponding to the first uplink switching period and a second duration corresponding to the second uplink switching period, wherein the uplink switching period includes the longest duration.

20. The method of claim 15, further comprising: The second UE capability indicates that the UE supports single-antenna port transmission or dual-antenna port transmission on a frequency band configured for transmit chain switching.

21. The method of claim 20, wherein selecting the uplink handover period further comprises: The uplink handover period is selected at least in part based on the second UE capability, wherein the first uplink handover period is associated with single-antenna port transmission on the frequency band of the frequency band combination, and the second uplink handover period is associated with dual-antenna port transmission on the frequency band of the frequency band combination.

22. The method of claim 20, further comprising: Transmit a control signal indicating the first uplink switching period or the second uplink switching period, wherein the selection of the uplink switching period is based at least in part on the control signal.

23. The method of claim 15, further comprising: The transmission of control signals is used to schedule the transmission of the uplink data messages according to the first transmit chain configuration, wherein the uplink switching period corresponds to a switching period associated with a configuration switch between the first transmit chain configuration and the second transmit chain configuration of the UE.

24. The method of claim 15, further comprising: The UE is determined to support the first transmission chain and the second transmission chain, which can be variably configured for single-port transmission, dual-port transmission, or no transmission on each of the first and second carriers, wherein receiving the UE capability message is based at least in part on the determination.

25. The method of claim 24, wherein the first uplink switching period supports a switching period associated with a configuration switching between a first transmit chain configuration supporting the single-port transmission on the first carrier and a second transmit chain configuration supporting the dual-port transmission on the second carrier.

26. The method of claim 24, wherein the first uplink switching period supports a switching period associated with a configuration switching between a first transmit chain configuration supporting dual-port transmission on the first carrier and a second transmit chain configuration supporting single-port transmission on the second carrier.

27. The method of claim 24, wherein the second uplink switching period supports a switching period associated with a configuration switching between a first transmit chain configuration supporting the dual-port transmission on the first carrier and a second transmit chain configuration supporting the dual-port transmission on the second carrier.

28. The method of claim 15, wherein receiving the uplink data message further comprises: Receive a first uplink data message on the first carrier of the respective component carriers used for communication; as well as The uplink data message is received on the second carrier after the preparation time of the corresponding component carrier used for communication.

29. An apparatus for wireless communication, comprising: processor; Memory coupled to the processor; as well as Instructions stored in the memory and executable by the processor to cause the device to perform the following operations: A UE capability message is transmitted, indicating UE capabilities supporting both a first uplink handover period for switching between a first pair of transmit chain configurations and a second uplink handover period different from the first uplink handover period and for switching between a second pair of transmit chain configurations, wherein each transmit chain configuration in the first pair of transmit chain configurations and the second pair of transmit chain configurations corresponds to a corresponding configuration of each of the UE's first transmit chain and the UE's second transmit chain on a corresponding component carrier for communication, and wherein the first uplink handover period and the second uplink handover period each correspond to different handover periods based at least in part on a first number of transmit chains as part of the handover between the first pair of transmit chain configurations and a second number of transmit chains as part of the handover between the second pair of transmit chain configurations; as well as According to the UE's first transmit chain configuration, uplink data messages are transmitted after a preparation time based at least in part on an uplink switching period that includes either the first uplink switching period or the second uplink switching period.

30. The apparatus of claim 29, wherein the instructions are further executable by the processor to cause the apparatus to perform any of the methods of claims 2-14.

31. An apparatus for wireless communication, comprising: processor; Memory coupled to the processor; as well as Instructions stored in the memory and executable by the processor to cause the device to perform the following operations: Receives a UE capability message from a User Equipment (UE), the UE capability message indicating UE capability supporting both a first uplink handover period for switching between a first pair of transmit chain configurations and a second uplink handover period different from the first uplink handover period and for switching between a second pair of transmit chain configurations, wherein each transmit chain configuration in the first pair of transmit chain configurations and the second pair of transmit chain configurations corresponds to a corresponding configuration of each of the UE's first transmit chain and the UE's second transmit chain on a corresponding component carrier for communication, and wherein the first uplink handover period and the second uplink handover period each correspond to different handover periods based at least in part on a first number of transmit chains as part of the handover between the first pair of transmit chain configurations and a second number of transmit chains as part of the handover between the second pair of transmit chain configurations; as well as According to the UE's first transmit chain configuration, uplink data messages are received from the UE after a preparation time based at least in part on an uplink switching period that includes either the first uplink switching period or the second uplink switching period.

32. The apparatus of claim 31, wherein the instructions are further executable by the processor to cause the apparatus to perform any of the methods of claims 16-28.

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