WO2021127959A1

WO2021127959A1 - Uplink transmission power determination

Info

Publication number: WO2021127959A1
Application number: PCT/CN2019/127753
Authority: WO
Inventors: Jinglin Zhang; Haojun WANG; Zhenqing CUI
Original assignee: Qualcomm Inc
Current assignee: Qualcomm Inc
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2021-07-01
Anticipated expiration: 2022-06-24

Abstract

Methods, systems, and devices for wireless communications are described to support user equipment (UE) uplink transmission power adjustment. A UE may transmit, to a base station and at a first transmission power, a first scheduling request for resources to transmit data. The first transmission power may be based on a channel transmission power and a scheduling request power adjustment that is generated using a counter, a threshold power, and a power step. If the UE does not receive resources in response to the first scheduling request, the UE may retransmit the first scheduling request in a second scheduling request. The UE may determine a second transmission power for the second scheduling request in a similar manner to determining the first transmission power. The second transmission power may be greater than the first transmission power and may be based on reception of a control message responsive to the first scheduling request.

Description

UPLINK TRANSMISSION POWER DETERMINATION

FIELD OF TECHNOLOGY

The following relates generally to wireless communications and more specifically to uplink transmission power determination.

BACKGROUND

Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the 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-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 may employ technologies such as code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal frequency division multiple access (OFDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) . A wireless multiple-access communications system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .

SUMMARY

The described techniques relate to improved methods, systems, devices, and apparatuses that support uplink transmission power determination and adjustment. Generally, the described techniques provide for UE-implemented uplink transmission power adjustment to facilitate improved uplink communications. In some examples, a UE may transmit a first scheduling request (e.g., requesting resources to transmit data) to a base station. The UE may determine or select a first transmission power for the first scheduling request and transmit the first scheduling request at (e.g., using) the first transmission power. The first transmission power may be based on a channel transmission power (e.g., a default or an initial channel transmission power, a channel transmission power defined by the wireless network or a communications standard) .

In some examples, the first transmission power may be based on a channel transmission power as well as a scheduling request power adjustment (e.g., the first transmission power may be adjusted from a default or initial level) . The UE may determine the channel transmission power based on one or more parameters, for example, that may be defined by the base station, defined another network device, or stored at the UE, or any combination thereof. The UE may determine the scheduling request power adjustment. For example, the UE may determine the scheduling request power adjustment based on a number of retransmissions associated with a scheduling request (e.g., a counter) , a threshold power adjustment, or a power adjustment step, or any combination thereof. The UE may combine (e.g., add) the channel transmission power and the scheduling request power adjustment to determine an adjusted channel transmission power and may use the adjusted channel transmission power to select or determine the first transmission power.

In some examples, if the UE does not receive an uplink grant or other message from the base station in response to the first scheduling request at the first transmission power (e.g., at a default transmission power or an adjusted transmission power) , the UE may determine to retransmit the first scheduling request. Accordingly, the UE may transmit a second scheduling request (e.g., that is a retransmission of the first scheduling request) , and the UE may transmit the second scheduling request at a second transmission power. In some examples, the second transmission power may be determined in a manner similar to the first transmission power. In some examples, the second transmission power may be greater than the first transmission power. For example, the UE may determine the first channel transmission power, determine a scheduling request power adjustment (e.g., a first adjustment if no adjustment was previously made, a second adjustment if an adjustment was included as part of the first transmission power) , and use the channel transmission power and the scheduling request power adjustment to determine or select the second transmission power. The UE may then transmit the second scheduling request using the second transmission power (which may be higher than the first transmission power) to the base station. The UE may continue determining adjusted transmission powers and transmitting corresponding scheduling requests at respective higher transmission powers until reaching a predefined number of scheduling requests, an expiration of a given duration, or until receiving an uplink grant or other control message (e.g., a transmit power control command) from the base station, among other examples.

A method of wireless communication at a UE is described. The method may include establishing a communication link with a base station, transmitting, to the base station over the communication link and at a first transmission power, a first scheduling request associated with data, determining, based on transmitting the first scheduling request, whether a control message responsive to the first scheduling request has been received from the base station, selecting, based on the first transmission power and determining whether the control message has been received, a second transmission power for a second scheduling request associated with the data, where the second transmission power is greater than the first transmission power, and transmitting, to the base station over the communication link and at the second transmission power, the second scheduling request.

An apparatus for wireless communication at a UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to establish a communication link with a base station, transmit, to the base station over the communication link and at a first transmission power, a first scheduling request associated with data, determine, based on transmitting the first scheduling request, whether a control message responsive to the first scheduling request has been received from the base station, select, based on the first transmission power and determining whether the control message has been received, a second transmission power for a second scheduling request associated with the data, where the second transmission power is greater than the first transmission power, and transmit, to the base station over the communication link and at the second transmission power, the second scheduling request.

Another apparatus for wireless communication at a UE is described. The apparatus may include means for establishing a communication link with a base station, transmitting, to the base station over the communication link and at a first transmission power, a first scheduling request associated with data, determining, based on transmitting the first scheduling request, whether a control message responsive to the first scheduling request has been received from the base station, selecting, based on the first transmission power and determining whether the control message has been received, a second transmission power for a second scheduling request associated with the data, where the second transmission power is greater than the first transmission power, and transmitting, to the base station over the communication link and at the second transmission power, the second scheduling request.

A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to establish a communication link with a base station, transmit, to the base station over the communication link and at a first transmission power, a first scheduling request associated with data, determine, based on transmitting the first scheduling request, whether a control message responsive to the first scheduling request has been received from the base station, select, based on the first transmission power and determining whether the control message has been received, a second transmission power for a second scheduling request associated with the data, where the second transmission power is greater than the first transmission power, and transmit, to the base station over the communication link and at the second transmission power, the second scheduling request.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a channel transmission power, where the first transmission power and the second transmission power may be based on the channel transmission power.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the channel transmission power may be based on one or more of a threshold output power associated with the UE, one or more radio resource control (RRC) parameters associated with the UE, a downlink pathloss value, an uplink transmission power adjustment, an uplink power control, or any combination thereof.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a scheduling request power adjustment, determining an adjusted channel transmission power by combining the scheduling request power adjustment and the channel transmission power, and comparing the adjusted channel transmission power with a threshold power output associated with the UE, where the first transmission power and the second transmission power may be based on comparing the adjusted channel transmission power with the threshold power output associated with the UE.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for selecting a minimum of the adjusted channel transmission power and the threshold power output associated with the UE, where the first transmission power and the second transmission power may be based on selecting the minimum.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining the scheduling request power adjustment may be based on a scheduling request power step, a scheduling request counter, and a threshold scheduling request power adjustment.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, determining the scheduling request power adjustment may include operations, features, means, or instructions for determining a first scheduling power adjustment that may be based on a product of the scheduling request power step and the scheduling request counter, comparing the first scheduling power adjustment with the threshold scheduling request power adjustment, and setting the scheduling request power adjustment to a minimum of the first scheduling power adjustment and the threshold scheduling request power adjustment.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, determining the scheduling request power adjustment further may include operations, features, means, or instructions for identifying that a transmission associated with the scheduling request power adjustment may be the transmitting the first scheduling request, and setting the scheduling request counter to a value of zero based on identifying that the transmission may be the first scheduling request, where determining the first scheduling power adjustment may be based on setting the scheduling request counter to the value of zero.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, determining the scheduling request power adjustment further may include operations, features, means, or instructions for identifying that a transmission associated with the scheduling request power adjustment may be the transmitting the second scheduling request, determining, based on identifying that the transmission may be the second scheduling request, that the control message responsive to the first scheduling request may have not been received, and increasing the scheduling request counter by a value based on determining that the control message may have not been received, where determining the first scheduling power adjustment may be based on increasing the scheduling request counter.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, determining the scheduling request power adjustment further may include operations, features, means, or instructions for identifying that a transmission associated with the scheduling request power adjustment may be the transmitting the second scheduling request, determining, based on identifying that the transmission may be the second scheduling request, that the control message responsive to the first scheduling request may have been received, and setting the scheduling request counter to a value based on determining that the control message may have been received, where determining the first scheduling power adjustment may be based on setting the scheduling request counter to the value.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for configuring, at the UE, the scheduling request power step, a unit associated with the scheduling request counter, and the threshold scheduling request power adjustment.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining, based on transmitting the second scheduling request, whether a second control message responsive to the second scheduling request may have been received from the base station, selecting, based on the second transmission power and determining whether the second control message may have been received, a third transmission power for a third scheduling request associated with the data, where the third transmission power may be greater than the first transmission power and the second transmission power, and transmitting, to the base station over the communication link and at the third transmission power, the third scheduling request.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the control message includes downlink control information (DCI) that includes a transmit power control (TPC) command.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, determining whether the control message responsive to the first scheduling request may have been received from the base station may include operations, features, means, or instructions for identifying that a next transmission may be the transmitting the second scheduling request, determining, based on identifying that the next transmission may be the second scheduling request, that the control message responsive to the first scheduling request may have been received, and selecting the second transmission power based on the TPC command included in the control message.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the control message includes DCI that includes an indication of uplink transmission resources.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that the first scheduling request may be not identified by the base station based on determining whether the control message responsive to the first scheduling request may have been received.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting a message to the base station over the communication link before transmitting the first scheduling request.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the message may include operations, features, means, or instructions for transmitting the message at the first transmission power.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, a second radio link quality associated with transmitting the first scheduling request may be lower than a first radio link quality associated with transmitting the message.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first scheduling request may be a next transmission to the base station following a transmission time interval associated with the message.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the communication link includes a frequency division duplexing (FDD) link or a supplementary uplink (SUL) link.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, a rate of change of uplink pathloss may be greater than a rate of change of downlink pathloss for a duration before transmitting the first scheduling request associated with the data.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a wireless communications system that supports uplink transmission power determination in accordance with aspects of the present disclosure.

FIG. 2 illustrates an example of a wireless communications system that supports uplink transmission power determination in accordance with aspects of the present disclosure.

FIG. 3 illustrates an example of a timing diagram that supports uplink transmission power determination in accordance with aspects of the present disclosure.

FIG. 4 illustrates an example of a process that supports uplink transmission power determination in accordance with aspects of the present disclosure.

FIG. 5 illustrates an example of a process flow that supports uplink transmission power determination in accordance with aspects of the present disclosure.

FIGs. 6 and 7 show block diagrams of devices that support uplink transmission power determination in accordance with aspects of the present disclosure.

FIG. 8 shows a block diagram of a communications manager that supports uplink transmission power determination in accordance with aspects of the present disclosure.

FIG. 9 shows a diagram of a system including a device that supports uplink transmission power determination in accordance with aspects of the present disclosure.

FIGs. 10 and 11 show flowcharts illustrating methods that support uplink transmission power determination in accordance with aspects of the present disclosure.

DETAILED DESCRIPTION

A base station and a user equipment (UE) may establish a communication link for uplink communications (e.g., where the communication link may also, in some examples, be associated with downlink communications) . In some examples, the UE may use a closed loop power control mechanism to determine or select an uplink transmission power for uplink messages transmitted over the communication link, where the closed loop power control may be based on one or more transmit power control (TPC) commands. After communicating one or more uplink messages or downlink messages or both, the UE and the base station may refrain from transmissions for a duration. Because no downlink messages are transmitted during the duration, the UE may not receive any TPC commands from the base station and may therefore not adjust the uplink transmission power. In some examples, the uplink radio link quality may decrease while the UE and the base station refrain from communications with each other. After refraining from active communications, uplink data may arrive (e.g., at a buffer) at the UE, and the UE may transmit a scheduling request to the base station (e.g., to request resources for transmission of the uplink data) . In some examples, the UE may transmit the scheduling request using a same uplink transmission power as the one or more uplink messages.

If uplink radio quality has decreased (e.g., due to pathloss) and uplink transmission power has not been adjusted (e.g., based on a TPC command) , the base station may, in some examples, be unable to receive or correctly decode the scheduling request, and may as a result not provide resources for the UE to transmit the uplink data. If the UE does not receive an uplink grant from the base station, the UE may retransmit the scheduling request to the base station. However, if the base station does not transmit any further TPC commands, the UE may retransmit the scheduling request at the same uplink transmission power as one or more previous scheduling requests. If uplink radio link quality remains the same or worsens, the base station may not correctly receive the one or more retransmissions of the scheduling request, and the UE may eventually initiate a random access procedure to request resources for transmission.

The techniques described herein support UE-implemented (e.g., UE-controlled) uplink transmission power adjustment to reduce a number of retransmissions and a likelihood of initiating a random access procedure while increasing the success of the transmission of one or more schedule requests. In some examples, the UE may transmit a first scheduling request after a duration with no communications (e.g., uplink communications or downlink communications) with the base station. The UE may determine or select a first transmission power for the first scheduling request and may transmit the first scheduling request at the first transmission power. The first transmission power may be based on a channel transmission power (e.g., defined by the wireless network, a communications standard) and a scheduling request power adjustment. The UE may determine the channel transmission power based on one or more parameters defined by the base station, defined another network device, or stored at the UE, or any combination thereof. The UE may determine the scheduling request power adjustment based on a number of retransmissions (e.g., a counter) associated with a scheduling request, a threshold power adjustment, and a power adjustment step. In some cases, the scheduling request power adjustment may be equal to zero for the first scheduling request and the first transmission power may be equal to the channel transmission power. In some cases, the scheduling request power adjustment may be greater than zero for the first scheduling request and the first transmission power may be greater than the channel transmission power.

The UE may combine (e.g., add) the channel transmission power and the scheduling request power adjustment to determine an adjusted channel transmission power and may use the adjusted channel transmission power to select or determine the first transmission power. In some examples, if the UE does not receive an uplink grant or other message from the base station in response to the first scheduling request at the first transmission power (e.g., at a default transmission power or an adjusted transmission power) , the UE may determine to retransmit the first scheduling request. Accordingly, the UE may transmit a second scheduling request (e.g., that is a retransmission of the first scheduling request) , and the UE may transmit the second scheduling request at a second transmission power. In some examples, the second transmission power may be determined in a manner similar to the first transmission power. In some examples, the second transmission power may be greater than the first transmission power. For example, the UE may determine the first channel transmission power, determine a scheduling request power adjustment (e.g., a first adjustment if no adjustment was previously made, a second adjustment if an adjustment was included as part of the first transmission power) , and use the channel transmission power and the scheduling request power adjustment to determine or select the second transmission power. The UE may then transmit the second scheduling request using the second transmission power (which may be higher than the first transmission power) to the base station.

In some examples, based on the second transmission power, the second scheduling request may be received (e.g., identified) by the base station. In some examples, the base station may be unable to correctly receive the second scheduling request (e.g., transmitted at the second transmission power) . As such, the UE may transmit a third scheduling request at a third transmission power, which may be determined in a similar manner to the first transmission power or the second transmission power or both. The UE may continue determining adjusted transmission powers and transmitting corresponding scheduling requests at respective higher transmission powers until reaching a predefined number of scheduling requests, an expiration of a given duration, or until receiving an uplink grant or other control message (e.g., a TPC command) from the base station, among other examples Determining a higher transmit power at the UE for each scheduling request retransmission may support a reduced number of retransmission attempts, more successful scheduling request operation, and a corresponding reduced latency, an improved quality, and a lower power consumption, among other advantages.

Aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are further illustrated by and described with reference to a timing diagram, a process, a process flow, apparatus diagrams, system diagrams, and flowcharts that relate to uplink transmission power determination.

FIG. 1 illustrates an example of a wireless communications system 100 that supports uplink transmission power determination in accordance with aspects of the present disclosure. The wireless communications 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 communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communications system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

The base stations 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may be devices in different forms or having different capabilities. The base stations 105 and the UEs 115 may wirelessly communicate via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base station 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which a base station 105 and a UE 115 may support the communication of signals according to one or more radio access technologies.

The UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115, the base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment) , as shown in FIG. 1.

The base stations 105 may communicate with the core network 130, or with one another, or both. For example, the base stations 105 may interface with the core network 130 through one or more backhaul links 120 (e.g., via an S1, N2, N3, or other interface) . The base stations 105 may communicate with one another over the backhaul links 120 (e.g., via an X2, Xn, or other interface) either directly (e.g., directly between base stations 105) , or indirectly (e.g., via core network 130) , or both. In some examples, the backhaul links 120 may be or include one or more wireless links.

One or more of the base stations 105 described herein may include or may be referred to by a person having ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or a giga-NodeB (either of which may be referred to as a gNB) , a Home NodeB, a Home eNodeB, or other suitable terminology.

A UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. A UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer. In some examples, a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, among other examples.

The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays as well as the base stations 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.

The UEs 115 and the base stations 105 may wirelessly communicate with one another via one or more communication links 125 over one or more carriers. The term “carrier” may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication links 125. For example, a carrier used for a communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP) ) that is operated 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 that coordinates operation for the carrier, user data, or other signaling. The wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation. A UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers.

Signal waveforms transmitted over a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) . In a system employing MCM techniques, a resource element may consist of one symbol period (e.g., a duration of one modulation symbol) and one 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 coding rate of the modulation scheme, or both) . Thus, the more resource elements that a UE 115 receives and the higher the order of the modulation scheme, the higher the data rate may be for the UE 115. A wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers or beams) , and the use of multiple spatial layers may further increase the data rate or data integrity for communications with a UE 115.

The time intervals for the base stations 105 or the UEs 115 may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of T _s=1/ (Δf _max·N _f) seconds, where Δf _max may represent the maximum supported subcarrier spacing, and N _f may represent the maximum supported discrete Fourier transform (DFT) size. Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) . Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .

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

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

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

In some examples, a base station 105 may be movable and therefore provide communication coverage for a moving geographic coverage area 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, the overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communications system 100 may include, for example, a heterogeneous network in which different types of the base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

The wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) or mission critical communications. The UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission critical functions) . Ultra-reliable communications may include private communication or group communication and may be supported by one or more mission critical services such as mission critical push-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 may be used interchangeably herein.

In some examples, a UE 115 may also be able to communicate directly with other UEs 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol) . One or more UEs 115 utilizing D2D communications may be within the geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105 or be otherwise unable to receive transmissions from a base station 105. In some examples, groups of the UEs 115 communicating via D2D communications may utilize a one-to-many (1: M) system in which each UE 115 transmits to every other UE 115 in the group. In some examples, a base station 105 facilitates the scheduling of resources for D2D communications. In other cases, D2D communications are carried out between the UEs 115 without the involvement of a base station 105.

The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or 5G core (5GC) , which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management function (AMF) ) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the base stations 105 associated with the core network 130. User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to the network operators IP services 150. The operators IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.

Some of the network devices, such as a base station 105, may include subcomponents such as an access network entity 140, which may be an example of an access node controller (ANC) . Each access network entity 140 may communicate with the UEs 115 through one or more other access network transmission entities 145, which may be referred to as radio heads, smart radio heads, or transmission/reception points (TRPs) . Each access network transmission entity 145 may include one or more antenna panels. In some configurations, various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or consolidated into a single network device (e.g., a base station 105) .

The wireless communications system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) . Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. The UHF waves may be blocked or redirected by buildings and environmental features, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors. The transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.

The wireless communications system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in unlicensed radio frequency spectrum bands, devices such as the base stations 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance. In some examples, operations in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in a licensed band (e.g., LAA) . Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

A base station 105 or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations 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, antennas or antenna arrays associated with a base station 105 may be located in diverse geographic locations. A base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115. Likewise, a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, an antenna panel may support radio frequency beamforming for a signal transmitted via an antenna port.

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

A UE may transmit a first scheduling request to a base station to request resources to transmit data. The UE may determine or select a first transmission power for the first scheduling request and transmit the first scheduling request at the first transmission power. The first transmission power may be based on a channel transmission power (e.g., defined by the wireless network, a communications standard) and a scheduling request power adjustment. The UE may combine (e.g., add) the channel transmission power and the scheduling request power adjustment to calculate an adjusted channel transmission power and may use the adjusted channel transmission power to select or determine the first transmission power. If the UE does not receive an uplink grant or other message from the base station in response to the first scheduling request at the first transmission power, the UE may determine to retransmit the first scheduling request.

Accordingly, the UE may transmit a second scheduling request that is a retransmission of the first scheduling request. The UE may transmit the second scheduling request at a second transmission power. In some examples, the second transmission power may be determined in a manner similar to the first transmission power and may be greater than the first transmission power. For example, the UE may determine the channel transmission power, determine the scheduling request power adjustment, and use the channel transmission power and the scheduling request power adjustment to determine or select the second transmission power. The UE may continue transmitting scheduling requests until reaching a predefined number of scheduling requests or until receiving an uplink grant or other control message from the base station.

FIG. 2 illustrates an example of a wireless communications system 200 that supports uplink transmission power determination in accordance with aspects of the present disclosure. In some examples, wireless communications system 200 may implement aspects of wireless communications system 100. For example, wireless communications system may include a base station 105-a and a UE 115-a, which may be examples of a base station 105 and a UE 115 described with reference to FIG. 1. Base station 105-a and UE 115-a may establish a communication link (e.g., for uplink communications or downlink communications or both) , and UE 115-a may transmit one or more scheduling requests 215 over the communication link. UE 115-a may use techniques described herein to select or determine a transmission power for the one or more scheduling requests 215.

UE 115-a and base station 105-a may establish the communication link for uplink and, in some examples, downlink communications. In some examples, UE 115-a and base station 105-a may establish a second communication link for downlink communications. In some examples, prior to transmitting the one or more scheduling requests, UE 115-a may transmit one or more uplink messages 205 to base station 105-a, or receive one or more downlink messages 210 from base station 105-a, or both. UE 115-a may, in some examples, use a closed loop power control mechanism to determine or select an uplink transmission power for uplink messages 205. The closed loop power control may be based on one or more TPC commands received from base station 105-a in the downlink (e.g., via a downlink message 210) . The one or more TPC commands may be based on downlink measurements (e.g., radio link quality measurements, such as pathloss) , where the downlink measurements may be used to estimate equivalent uplink values (e.g., uplink pathloss) .

In some examples, UE 115-a and base station 105-a may communicate over a FDD link in both the downlink and the uplink, may communicate over a supplementary uplink (SUL) link in the uplink, or may communicate over a time-division duplexing (TDD) link in both the downlink and uplink, among other examples. In the example where the communication link is an FDD or an SUL link, uplink and downlink communications may use different frequency ranges (e.g., different resource blocks (RBs) or frequency domains) . In such cases, uplink radio link quality (e.g., pathloss) may have a greater rate of change than downlink radio link quality over a duration (e.g., uplink pathloss may deviate from the downlink pathloss) . For example, uplink radio link quality may decrease while downlink radio link quality remains relatively level.

After communicating uplink messages 205 or downlink messages 210 (or both) , UE 115-a and base station 105-a may refrain from transmissions for a duration. Because no downlink messages 210 are transmitted during the duration, UE 115-a may not receive any TPC commands from base station 105-a and may therefore not adjust the uplink transmission power. In some examples, the uplink radio link quality may decrease while UE 115-a and base station 105-a refrain from communications (e.g., the uplink may have a greater pathloss than the downlink) or perform communications that do not indicate a reduced radio link quality. Uplink data may, for example, arrive at a buffer of UE 115-a, and UE 115-a may transmit a scheduling request 215 to base station 105-a (e.g., to request resources for transmission of the uplink data) . UE 115-a may transmit the scheduling request 215 to base station 105-a over a channel, such as a physical uplink control channel (PUCCH) . In some examples, UE 115-a may transmit the scheduling request 215 using a same uplink transmission power as the one or more uplink messages 205.

If uplink radio quality has decreased (e.g., due to pathloss) and uplink transmission power has not been adjusted, base station 105-a may, in some examples, be unable to correctly decode the scheduling request 215 and may not provide resources for UE 115-a to transmit the uplink data. If UE 115-a does not receive an uplink grant from base station 105-a, UE 115-a may retransmit the scheduling request 215 to base station 105-a. However, if base station 105-a does not transmit any further TPC commands, UE 115-a may retransmit the scheduling request 215 at the same uplink transmission power. If uplink radio link quality remains the same or worsens, base station 105-a may not receive retransmissions of the scheduling request 215, and after a predefined number of retransmissions (e.g., configured via radio resource control (RRC) signaling, such as a parameter sr-TransMax) , UE 115-a may trigger a random access procedure with base station 105-a to acquire resources for uplink transmissions.

Accordingly, the techniques described herein support UE-implemented (e.g., UE-controlled) uplink transmission power adjustment. Such power adjustment may reduce latency by reducing a number of retransmissions and by reducing a likelihood of triggering a random access procedure. The reduction in latency may increase battery life at UE 115-a by reducing a number of total uplink transmissions. The power adjustment may further increase the quality of scheduling request transmissions.

In one example, UE 115-a may implement transmission power adjustment when transmitting the one or more scheduling requests 215. For example, UE 115-a may transmit a first scheduling request 215-a after a duration of no communications with base station 105-a (e.g., uplink communications or downlink communications) . UE 115-a may determine or select a first transmission power for scheduling request 215-a and may transmit scheduling request 215-a at the first transmission power. The first transmission power may be based on a channel transmission power (e.g., defined by the wireless network, a communications standard) and a scheduling request power adjustment. For example, UE 115-a may determine the channel transmission power based on one or more parameters defined by base station 105-a, defined another network device, or stored at the UE 115-a, or any combination thereof. UE 115-a may determine the scheduling request power adjustment based on a number of retransmissions associated with scheduling request 215-a (e.g., 0) , and one or more UE-configured parameters. UE 115-a may combine (e.g., add) the channel transmission power and the scheduling request power adjustment to calculate an adjusted channel transmission power and may use the adjusted channel transmission power to select or determine the first transmission power. Methods for determining the channel transmission power, the scheduling request power adjustment, and the adjusted channel transmission power are further described herein with reference to FIG. 4.

If UE 115-a does not receive an uplink grant (e.g., included in a downlink control information (DCI) message) from base station 105-a in response to scheduling request 215-a, UE 115-a may determine to retransmit scheduling request 215-a. Accordingly, UE 115-a may transmit a second scheduling request 215-b that is a retransmission of scheduling request 215-a. UE 115-a may transmit scheduling request 215-b at a second transmission power. In some examples, the second transmission power may be determined in a manner similar to the first transmission power and may be greater than the first transmission power. For example, UE 115-a may determine the channel transmission power, determine the scheduling request power adjustment, and use the channel transmission power and the scheduling request power adjustment to determine or select the second transmission power. The scheduling request power adjustment may be based on the number of retransmissions associated with scheduling request 215-b (e.g., 1) and may also be based on whether UE 115-a has received a TPC command (e.g., included in a DCI message) from base station 105-a since transmitting scheduling request 215-a.

In some examples, based on the second transmission power, scheduling request 215-b may be correctly received (e.g., identified) by base station 105-a. In some examples, base station 105-a may still be unable to correctly receive scheduling request 215-b (e.g., transmitted at the second transmission power) . As such, UE 115-a may transmit a third scheduling request 215 at a third transmission power, determined in similar manner to the first and second transmission powers. UE 115-a may continue transmitting scheduling requests 215 until reaching the predefined number of scheduling requests 215 or until receiving an uplink grant from base station 105-a. Determining a new transmit power for each retransmission of scheduling request 215-a may support a reduced number of retransmission attempts and a corresponding reduced latency, improved quality, and lower power consumption, as described herein.

FIG. 3 illustrates an example of a timing diagram 300 that supports uplink transmission power determination in accordance with aspects of the present disclosure. In some examples, timing diagram 300 may be implemented by, or relate to, aspects of

wireless communications systems

100 or 200. For example, a base station 105 and a UE 115 may implement one or more aspects of timing diagram 300. The base station 105 and UE 115 may be examples of a base station 105 and a UE 115 described with reference to FIGs. 1 and 2.

As described with reference to FIG. 2, the UE 115 and the base station 105 may establish a communication link and communicate with one or more UEs 115 in the downlink direction or the uplink direction or both. For example, the UE 115 may transmit one or more uplink messages 305 to the base station 105 or receive one or more downlink messages 310 from the base station 105 (or both) during a first time duration 320-a. In some examples, the communication link may be an FDD link or an SUL link, among other examples, and the uplink and downlink communications may use different frequency ranges and may have different pathloss characteristics (e.g., pathloss rate of change, magnitude) .

At 325, the UE 115 and the base station 105 may refrain from transmissions for a second time duration 320-b (e.g., because no data is ready for transmission) . If no downlink messages 310 are transmitted during time duration 320-b, the UE 115 may not receive any TPC commands from the base station 105 and may therefore not adjust uplink transmission power. In some examples, the uplink radio link quality associated with uplink transmissions over the communication link may decrease during time duration 320-b (e.g., the uplink may have a greater pathloss than the downlink during time duration 320-b) .

At or before 330, uplink data may arrive at a buffer of the UE 115. Accordingly, at or after 330, the UE 115 may transmit (e.g., over a channel such as a PUCCH) a first or an initial scheduling request 315 to the base station 105 to request resources for transmission of the uplink data. The UE 115 may transmit the first scheduling request at a first transmission power, where the first transmission power may be determined using the power adjustment techniques described herein (e.g., using one or more methods described with reference to FIG. 4) . In some examples, the first transmission power may be a same uplink transmission power as used for the one or more uplink messages 305 (e.g., because no other TPC commands have been received during time duration 320-b) . In some examples, the base station 105 may be unable to correctly decode the first scheduling request 315 at the first transmission power (e.g., due to a mismatch between channel quality and the first transmission power) and may not provide resources for the UE 115 to transmit the uplink data.

If the UE 115 does not receive an uplink grant from the base station 105, the UE 115 may retransmit the first scheduling request 315 to the base station 105. For example, the UE 115 may transmit, to the base station 105, a second scheduling request 315 that includes at least some information included in the first scheduling request 315. The UE 115 may determine or select a second transmission power for the second scheduling request 315 (e.g., using one or more methods described with reference to FIG. 4) and may transmit the second scheduling request to the base station 105 at the second transmission power.

In some examples, a mismatch may still exist between the channel quality and the second transmission power, such that the base station 105 may not correctly receive (e.g., may not receive or identify) the second scheduling request 315. The base station 105 may therefore not provide a grant of uplink resources for the UE 115. If the UE 115 does not receive an uplink grant from the base station 105, the UE 115 may retransmit the first scheduling request 315 a second time to the base station 105. For example, the UE 115 may transmit, to the base station 105, a third scheduling request 315 that includes at least some information included in the first scheduling request 315 and the second scheduling request 315. The UE 115 may determine or select a third transmission power for the third scheduling request 315 (e.g., using one or more methods described with reference to FIG. 4) and may transmit the third scheduling request to the base station 105 at the third transmission power.

The UE 115 may continue retransmitting subsequent scheduling requests until receiving a grant (e.g., via a DCI) from the base station in response to one of the retransmitted scheduling requests or until the UE 115 reaches a predefined or threshold number of retransmissions (e.g., a maximum number of retransmissions configured via RRC) . For each subsequent scheduling request, the UE 115 may determine a transmission power using the methods described herein. If the UE 115 reaches or exceeds the predefined number of transmissions (e.g., at 335) , the UE 115 may refrain from retransmitting the scheduling request and may initiate a random access procedure with the base station 105.

FIG. 4 illustrates an example of a process 400 that supports uplink transmission power determination in accordance with aspects of the present disclosure. In some examples, process 400 may be implemented by, or relate to, aspects of

wireless communications systems

100 or 200. For example, a UE 115 may implement process 400 in order to select or determine a transmission power for one or more scheduling requests, as described with reference to FIGs. 2 and 3. The UE 115 may be an example of a UE 115 described with reference to FIGs. 1–3. The UE 115 may transmit the one or more scheduling requests to a base station 105, which may be an example of a base station 105 described with reference to FIGs. 1–3. The UE 115 may perform process 400 upon determining to transmit a scheduling request (e.g., a first scheduling request or a scheduling request retransmission) to the base station 105, and may implement the process 400 in order to adjust a transmission power for any scheduling request transmitted to the base station 105 (e.g., before transmitting the scheduling request) .

As described with reference to FIGs. 2 and 3, UE 115 may determine the transmission power for one or more scheduling requests based on a channel transmission power (e.g., a PUCCH transmission power) and a scheduling request power adjustment. In some examples, the scheduling request power adjustment may be based on a scheduling request counter, a scheduling request power step, and a threshold scheduling request power adjustment. In some examples, the scheduling request counter may represent a total number of scheduling request retransmissions, or a number of scheduling request retransmissions performed since receiving a TPC command. In some examples, the scheduling request power step may represent a value of a power increase for each successive scheduling request transmission. In some examples, the threshold scheduling request power adjustment may represent a maximum amount of power (e.g., a ceiling) that a scheduling request may be increased above the channel transmission power. The UE 115 may configure the scheduling request power step, the threshold scheduling request power adjustment, and a unit associated with the scheduling request counter.

In the following description of process 400, the operations may be performed in a different order than the order shown, or the operations may be performed in different orders or at different times. Specific operations may also be left out of process 400, or other operations may be added to process 400. Although UE 115 is described as performing the operations of process 400, some aspects of some operations may also be performed by one or more other wireless devices.

At 405, the UE 115 may determine whether a scheduling request to be transmitted to the base station 105 is a new scheduling request. A scheduling request may be a new scheduling request if it is not a retransmission of a previous scheduling request. For example, if a UE 115 determines to transmit a scheduling request for new data (e.g., data unassociated with a previous scheduling request) , then the scheduling request may be considered to be a new scheduling request. Similarly, if there are zero retransmissions of the scheduling request, the scheduling request may be considered to be a new scheduling request. If the scheduling request is a new scheduling request, the UE 115 may proceed to 415 and may reset the scheduling request counter. If the scheduling request is not a new scheduling request (e.g., if the scheduling request is a retransmission of a previous scheduling request) , the UE 115 may proceed to 410.

At 410, the UE 115 may determine whether the UE 115 has received a TPC command from the base station 105 since a most recent scheduling request (e.g., after transmitting the most recent scheduling request) . For example, the base station 105 may transmit a TPC command to the UE 115 in response to a partially-received scheduling request, or may include a TPC command in one or more downlink communications to the UE 115. If the UE 115 has not received a TPC command, the UE 115 may proceed to 420 and increment the scheduling request counter. If the UE 115 has received a TPC command, the UE 115 may proceed to step 415.

At 415, the UE 115 may reset the scheduling request counter. In some examples, resetting the scheduling request counter may indicate that the scheduling request is a new scheduling request, or in some examples, resetting the scheduling request counter may indicate that the scheduling request is a first scheduling request following a TPC command. In some examples, resetting the scheduling request counter may include setting the scheduling request counter to a value of zero. In some examples, resetting the scheduling request counter may include setting the scheduling request counter to another value. After resetting the scheduling request counter, the UE 115 may proceed to 425.

At 420, the UE 115 may increment the scheduling request counter (e.g., if the UE 115 determines that no TPC command has been received at 410) . The UE 115 may increment the scheduling request counter by a value of one, or by another value (e.g., a value equal to the unit of the scheduling request counter) . Incrementing the scheduling request counter may indicate that the scheduling request is a retransmission of a previous scheduling request. In one example (e.g., if the increment is equal to one) , if the UE 115 increments the scheduling request counter to a value of X, the scheduling request may represent the Xth retransmission of an initial scheduling request. After incrementing the scheduling request counter, the UE 115 may proceed to 425.

At 425, the UE 115 may determine the channel transmission power associated with a channel for transmitting the scheduling request. In some examples, the channel associated with transmission of the scheduling request may be a PUCCH. In some examples (e.g., if the channel is a PUCCH) , the UE 115 may use equation (1) to determine the channel transmission power:

where P _{PUCCH, b, f, c} (i, q _u, q _d, l) represents the channel (e.g., PUCCH) transmission power, min represents a minimum function, P _CMAX, f, c(i) represents a maximum output power configured for the UE 115 (e.g., a threshold power output) , P _{O_PUCCH, b, f, c} (q _u) represents a base power that may be calculated by RRC configured parameters, μ represents a subcarrier spacing configuration that may be RRC configured,

represents a bandwidth of the channel that may be calculated by RRC configured parameters, Δ _{F_PUCCH} (F) represents a channel (e.g., PUCCH) transmission power adjustment that may be calculated by RRC configured parameters, PL _b, f, c (q _d) represent a downlink pathloss (e.g., used as an estimate for uplink pathloss) , Δ _{TF, b, f, c} (i) represents a channel (e.g., PUCCH) transmission power adjustment component (e.g., corresponding to a number of control bits in the PUCCH occasion) , and g _b, f, c (i, l) represents a channel (e.g., PUCCH) power control adjustment state corresponding to a network TPC command.

In some examples, one or more of the parameters for determining the channel transmission power may be configured via RRC signaling from the base station 105. For example, the base station 105 may transmit, to the UE 115, an RRC configuration indicating one or more parameters associated with the channel transmission power. Some RRC configured parameters may be based on a cell (e.g., a primary cell) , a bandwidth part, a carrier, a power state index, a channel transmission occasion (e.g., PUCCH occasion) , or any combination thereof, that are associated the channel. In some examples, one or more of the parameters for determining the channel transmission power may be stored at the UE 115. For example, one or more of the parameters may be configured by the wireless network or by a communication standard and may be stored at the UE 115. Additionally, one or more of the parameters for determining the channel transmission power may be based on one or more of an uplink power control (e.g., a TPC command) , a pathloss value (e.g., downlink pathloss) , a channel transmission power adjustment (e.g., based on a number of control bits for a transmission occasion) , or other network parameters. In some examples, the channel transmission power may apply to any transmission over the same channel (e.g., the PUCCH) .

At 430, the UE 115 may determine a scheduling request power adjustment. In some examples, a value of the scheduling request power adjustment may be different for each retransmission of an initial scheduling request. In some examples, the scheduling request power adjustment may be determined using equation (2) :

where Δ _SR, b, ,c (i) represents the scheduling request power adjustment, min represents a minimum function, maxSrPowerRamping represents the threshold scheduling request power adjustment, srPowerRampingStep represents the scheduling request power step, and srPowerRampingCounter represents the scheduling request counter. In some examples, the UE 115 may determine a first scheduling request adjustment by taking a product of the scheduling request power step and the scheduling request counter. The UE 115 may compare the first scheduling request with the threshold scheduling request power adjustment and may take a minimum of the two values for the scheduling request power adjustment.

In some examples, one or more parameters for determining the scheduling request power adjustment may be configured or determined by the UE 115. For example, the UE 115 made determine or configure itself with one or more of the unit of the scheduling request counter, the scheduling request power step, or the scheduling request power adjustment threshold. For example, the UE 115 may configure the unit of the scheduling request counter to be a value of one, two, or any other number. The UE 115 may also configure the scheduling request power step to be a larger power step or a smaller power step (e.g., based on channel quality or a UE capability or other factors or any combination thereof) . The UE 115 may also raise or lower the scheduling request power adjustment (e.g., based on available power or UE capability) . In some examples, the one or more parameters configured by the UE 115 may be based on network conditions, one or more capabilities of the UE 115, or one or more other factors.

At 435, the UE 115 may select or determine a transmission power for the scheduling request based on the channel transmission power and the scheduling request power adjustment. For example, the UE 115 may determine an adjusted channel transmission power for the scheduling request using equation (3) :

where P _{PUCCH, adjusted, b, f, c} (i, q _u, q _d, l) represents the adjusted channel transmission power, min represents a minimum function, P _CMAX, f, c (i) represents the maximum output power configured for the UE 115 (e.g., threshold power output) , P _{PUCCH, b, f, c} (i, q _u, q _d, l) represents the channel transmission power, and Δ _{SR, b, f, c} (i) represents the scheduling request power adjustment. In some examples, the UE 115 may combine or add the channel transmission power and the scheduling request power adjustment to generate a first adjusted channel transmission power. The UE 115 may compare the first adjusted channel transmission power with the maximum output power for the UE 115 and may take the minimum of the two values for the adjusted channel transmission power. As described herein with reference to FIGs. 2 and 3, the UE may use the adjusted channel transmission power to transmit a first scheduling request or a retransmission of a scheduling request (e.g., may set the transmission power of a scheduling request to the adjusted channel transmission power) .

FIG. 5 illustrates an example of a process flow 500 that supports uplink transmission power determination in accordance with aspects of the present disclosure. In some examples, process flow 500 may be implemented by, or relate to, aspects of

wireless communications systems

100 or 200. Process flow 500 may also implement aspects of timing diagram 300 or process 400 or both. Process flow may be implemented by a UE 115-b and a base station 105-b, which may be examples of a UE 115 and a base station 105 described with reference to FIGs. 1–4. For example, UE 115-b may implement aspects of process flow 500 in order to select or determine a transmission power for one or more scheduling requests, as described with reference to FIGs. 2–4.

In the following description of process flow 500, the operations between UE 115-b and base station 105-b may be transmitted in a different order than the order shown, or the operations performed by UE 115-b or base station 105-b may be performed in different orders or at different times. Specific operations may also be left out of process flow 500, or other operations may be added to process flow 500. Although UE 115-b and base station 105-b are shown performing the operations of process flow 500, some aspects of some operations may also be performed by one or more other wireless devices.

At 505, UE 115-b and base station 105-b may establish a communication link that supports uplink communications. In some examples (e.g., for an FDD or TDD link) , the communication link may also support downlink communications or other communication link types. UE 115-b may establish the communication link when initially establishing communications with base station 105-b (e.g., when connecting to the network or transferring from another base station 105) , or may establish the communication link after communicating with base station 105-b for a time period.

At 510, UE 115-b and base station 105-b may, in some examples, communicate one or more uplink messages or downlink messages or both. In some examples, the downlink and uplink message (s) may be according to an FDD or a TDD scheme. In some examples, UE 115-b may transmit one or more uplink messages according to an SUL scheme. UE 115-b may transmit the one or more uplink messages at an initial transmission power, which may be based on at least one TPC command from base station 105-b. As described herein, in some examples, UE 115-b and base station 105-b may refrain from communicating for a time duration following the one or more uplink messages or downlink messages or both.

At 515, UE 115-b may identify data for transmission to base station 105-b (e.g., uplink data to transmit via one or more uplink channels) . In some examples, the data may arrive at a buffer of UE 115-b for transmission. The data may be new data, where the new data may be unassociated with any other previous scheduling request or uplink transmission from UE 115-b to base station 105-b. In some examples, some of the data may be new data and some of the data may be at least partially associated with a previous scheduling request or uplink transmission.

At 520, UE 115-b may transmit, to base station 105-b and over the communication link, a first scheduling request associated with the identified data. UE 115-b may transmit the first scheduling request at a first transmission power, which in some examples, may be a same transmission power as the initial transmission power associated with the one or more uplink messages. UE 115-b may determine or select the first transmission power using one or more methods described herein, for example, with reference to FIGs. 2 and 4. For example, UE 115-b may determine a channel transmission power and a scheduling request power adjustment, and may determine an adjusted channel transmission power (e.g., the first transmission power) based on the channel transmission power and the adjusted scheduling request power. UE 115-b may transmit the first scheduling request over a channel (e.g., a control channel, such as a PUCCH) associated with base station 105-b. In some examples, a channel quality associated with the communication link or with the channel may degrade or worsen before UE 115-b transmits the first scheduling request. As such, the first transmission power and the channel quality may be mismatched, such that base station 105-b may be unable to successfully receive, decode, or identify the first scheduling request.

At 525, UE 115-b may determine, based on transmitting the first scheduling request, whether a control message has been received in response to the first scheduling request. The control message may be or include, for example, a DCI including an uplink grant or a DCI including a TPC command. In some examples, UE 115-b may determine that base station 105-b has not identified or received the first scheduling request based on determining that no uplink grant (e.g., received via a DCI) has been received in response to the first scheduling request. In some examples, UE 115-b may determine whether a TPC command has been received from base station 105-b after transmitting the first scheduling request.

At 530, UE 115-b may select or determine a second transmission power for transmitting a second scheduling request to base station 105-b for the identified data, where the second transmission power may be greater than the first transmission power. For example, if UE 115-b determines that base station 105-b has not identified or received the first scheduling request, UE 115-b may retransmit all or a portion of the first scheduling request in the second scheduling request. UE 115-b may determine a transmission power for the second scheduling request as described herein with reference to FIGs. 2 and 4. For example, UE 115-b may determine a channel transmission power and a scheduling request power adjustment, and may determine an adjusted channel transmission power (e.g., the second transmission power) based on the channel transmission power and the adjusted scheduling request power. The scheduling request power adjustment may be based on determining whether a control message (e.g., a TPC command transmitted via DCI) has been received by UE 115-b from base station 105-b in response to the first scheduling request.

At 535, UE 115-b may transmit, to base station 105-b, the second scheduling request over the communication link and at the second transmission power.

At 540, in some examples, UE 115-b may transmit a third scheduling request to base station 105-b. For example, UE 115-b may transmit the third scheduling request based on determining whether a control message responsive to the second scheduling request has been received from base station 105-b. UE 115-b may select a third transmission power, using the methods described herein, and may transmit the third scheduling request at the third transmission power.

In some examples, base station 105-b may receive and successfully decode the second scheduling request, the third scheduling request, or another scheduling request that is based on the scheduling request power adjustment. Base station 105-b may, based on the successfully-received scheduling request, transmit an uplink grant to UE 115-b including an indication of uplink transmission resources for the data identified by UE 115-b. UE 115-b may then use the resources indicated in the uplink grant to transmit the identified data to the base station 105-b. If a scheduling request (e.g., the second or third scheduling request) is correctly received or identified by base station 105-b, UE 115-b may refrain from transmitting subsequent scheduling requests for the same data (e.g., the third scheduling request) .

FIG. 6 shows a block diagram 600 of a device 605 that supports uplink transmission power determination in accordance with aspects of the present disclosure. The device 605 may be an example of aspects of a UE 115 as described herein. The device 605 may include a receiver 610, a communications manager 615, and a transmitter 620. The device 605 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to uplink transmission power determination) . Information may be passed on to other components of the device 605. The receiver 610 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The receiver 610 may utilize a single antenna or a set of antennas.

The communications manager 615 may establish a communication link with a base station, transmit, to the base station over the communication link and at a first transmission power, a first scheduling request associated with data. The communications manager 615 may also determine, based on transmitting the first scheduling request, whether a control message responsive to the first scheduling request has been received from the base station. The communications manager 615 may further select, based on the first transmission power and determining whether the control message has been received, a second transmission power for a second scheduling request associated with the data, where the second transmission power is greater than the first transmission power. The communications manager 615 may also transmit, to the base station over the communication link and at the second transmission power, the second scheduling request. The communications manager 615 may be an example of aspects of the communications manager 910 described herein.

The communications manager 615, or its sub-components, may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 615, or its sub-components may be executed by a general-purpose processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

The communications manager 615, or its sub-components, may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components. In some examples, the communications manager 615, or its sub-components, may be a separate and distinct component in accordance with various aspects of the present disclosure. In some examples, the communications manager 615, or its sub-components, may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.

The transmitter 620 may transmit signals generated by other components of the device 605. In some examples, the transmitter 620 may be collocated with a receiver 610 in a transceiver module. For example, the transmitter 620 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The transmitter 620 may utilize a single antenna or a set of antennas.

The actions performed by the communications manager 615, among other examples herein, as described herein may be implemented to realize one or more potential advantages. For example, communications manager 615 may increase communication reliability and decrease communication latency at a wireless device (e.g., a UE 115) by enabling UE uplink transmission power adjustment. The power adjustment may reduce transmission delays, improve communication accuracy, or reduce power consumption (or any combination thereof ) compared to other systems and techniques, for example, that retransmit a scheduling request at a same power as a previous scheduling request, which may increase delay and power consumption. Accordingly, communications manager 615 may save power and increase battery life at a wireless device (e.g., a UE 115) by strategically reducing a number of retransmissions, or reducing a number of random access procedures performed by the device, or both.

FIG. 7 shows a block diagram 700 of a device 705 that supports uplink transmission power determination in accordance with aspects of the present disclosure. The device 705 may be an example of aspects of a device 605, or a UE 115 as described herein. The device 705 may include a receiver 710, a communications manager 715, and a transmitter 745. The device 705 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to uplink transmission power determination) . Information may be passed on to other components of the device 705. The receiver 710 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The receiver 710 may utilize a single antenna or a set of antennas.

The communications manager 715 may be an example of aspects of the communications manager 615 as described herein. The communications manager 715 may include a link establishment component 720, a first scheduling request component 725, a control message reception component 730, a transmission power component 735, and a second scheduling request component 740. The communications manager 715 may be an example of aspects of the communications manager 910 described herein.

The link establishment component 720 may establish a communication link with a base station. The first scheduling request component 725 may transmit, to the base station over the communication link and at a first transmission power, a first scheduling request associated with data. The control message reception component 730 may determine, based on transmitting the first scheduling request, whether a control message responsive to the first scheduling request has been received from the base station.

The transmission power component 735 may select, based on the first transmission power and determining whether the control message has been received, a second transmission power for a second scheduling request associated with the data, where the second transmission power is greater than the first transmission power. The second scheduling request component 740 may transmit, to the base station over the communication link and at the second transmission power, the second scheduling request.

The transmitter 745 may transmit signals generated by other components of the device 705. In some examples, the transmitter 745 may be collocated with a receiver 710 in a transceiver module. For example, the transmitter 745 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The transmitter 745 may utilize a single antenna or a set of antennas.

A processor of a wireless device (e.g., controlling the receiver 710, the transmitter 745, or the transceiver 920 as described with reference to FIG. 9) may increase communication reliability and accuracy by enabling the wireless device to reduce latency associated with retransmitting a scheduling request to the network. The reduced latency may reduce transmission delays and power consumption (e.g., via implementation of system components described with reference to FIG. 8) compared to other systems and techniques, for example, that retransmit a scheduling request at a same power as a previous scheduling request, which may increase delay and power consumption. Further, the processor of the UE 115 may identify one or more aspects of a scheduling request power adjustment to perform the processes described herein. The processor of the wireless device may use the scheduling request power adjustment to perform one or more actions that may result in higher communication accuracy and communication reliability, as well as save power and increase battery life at the wireless device (e.g., by a number of retransmissions and random access procedures) , among other benefits.

FIG. 8 shows a block diagram 800 of a communications manager 805 that supports uplink transmission power determination in accordance with aspects of the present disclosure. The communications manager 805 may be an example of aspects of a communications manager 615, a communications manager 715, or a communications manager 910 described herein. The communications manager 805 may include a link establishment component 810, a first scheduling request component 815, a control message reception component 820, a transmission power component 825, a second scheduling request component 830, a third scheduling request component 835, and an uplink transmission component 840. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .

The link establishment component 810 may establish a communication link with a base station. In some examples, the communication link includes a FDD link or a SUL link. In some examples, a rate of change of uplink pathloss is greater than a rate of change of downlink pathloss for a duration before transmitting the first scheduling request associated with the data.

The first scheduling request component 815 may transmit, to the base station over the communication link and at a first transmission power, a first scheduling request associated with data. In some examples, the first scheduling request component 815 may identify that a transmission associated with the scheduling request power adjustment is the transmitting the first scheduling request.

The control message reception component 820 may determine, based on transmitting the first scheduling request, whether a control message responsive to the first scheduling request has been received from the base station. In some examples, the control message reception component 820 may determine, based on identifying that the transmission is the second scheduling request, that the control message responsive to the first scheduling request has not been received. In some examples, the control message reception component 820 may determine, based on identifying that the transmission is the second scheduling request, that the control message responsive to the first scheduling request has been received.

In some examples, the control message reception component 820 may determine, based on transmitting the second scheduling request, whether a second control message responsive to the second scheduling request has been received from the base station. In some examples, the control message reception component 820 may determine, based on identifying that the next transmission is the second scheduling request, that the control message responsive to the first scheduling request has been received. In some examples, the control message reception component 820 may determine that the first scheduling request is not identified by the base station based on determining whether the control message responsive to the first scheduling request has been received.

In some examples, the control message includes DCI that includes a TPC command. In some examples, the control message includes DCI that includes an indication of uplink transmission resources.

The transmission power component 825 may select, based on the first transmission power and determining whether the control message has been received, a second transmission power for a second scheduling request associated with the data, where the second transmission power is greater than the first transmission power. In some examples, the transmission power component 825 may determine a channel transmission power, where the first transmission power and the second transmission power are based on the channel transmission power.

In some examples, the transmission power component 825 may determine a scheduling request power adjustment. In some examples, the transmission power component 825 may determine an adjusted channel transmission power by combining the scheduling request power adjustment and the channel transmission power. In some examples, the transmission power component 825 may compare the adjusted channel transmission power with a threshold power output associated with the UE, where the first transmission power and the second transmission power are based on comparing the adjusted channel transmission power with the threshold power output associated with the UE. In some examples, the transmission power component 825 may select a minimum of the adjusted channel transmission power and the threshold power output associated with the UE, where the first transmission power and the second transmission power are based on selecting the minimum.

In some examples, the transmission power component 825 may determine the scheduling request power adjustment is based on a scheduling request power step, a scheduling request counter, and a threshold scheduling request power adjustment. In some examples, the transmission power component 825 may determine a first scheduling power adjustment that is based on a product of the scheduling request power step and the scheduling request counter. In some examples, the transmission power component 825 may compare the first scheduling power adjustment with the threshold scheduling request power adjustment. In some examples, the transmission power component 825 may set the scheduling request power adjustment to a minimum of the first scheduling power adjustment and the threshold scheduling request power adjustment. In some examples, the transmission power component 825 may set the scheduling request counter to a value of zero based on identifying that the transmission is the first scheduling request, where determining the first scheduling power adjustment is based on setting the scheduling request counter to the value of zero.

In some examples, the transmission power component 825 may increase the scheduling request counter by a value based on determining that the control message has not been received, where determining the first scheduling power adjustment is based on increasing the scheduling request counter. In some examples, the transmission power component 825 may set the scheduling request counter to a value based on determining that the control message has been received, where determining the first scheduling power adjustment is based on setting the scheduling request counter to the value. In some examples, the transmission power component 825 may configure, at the UE, the scheduling request power step, a unit associated with the scheduling request counter, and the threshold scheduling request power adjustment.

In some examples, the transmission power component 825 may select, based on the second transmission power and determining whether the second control message has been received, a third transmission power for a third scheduling request associated with the data, where the third transmission power is greater than the first transmission power and the second transmission power. In some examples, the transmission power component 825 may select the second transmission power based on the TPC command included in the control message. In some examples, the transmission power component 825 may transmit the message at the first transmission power.

In some examples, the channel transmission power is based on one or more of a threshold output power associated with the UE, one or more RRC parameters associated with the UE, a downlink pathloss value, an uplink transmission power adjustment, an uplink power control, or any combination thereof.

The second scheduling request component 830 may transmit, to the base station over the communication link and at the second transmission power, the second scheduling request. In some examples, the second scheduling request component 830 may identify that a transmission associated with the scheduling request power adjustment is the transmitting the second scheduling request. In some examples, the second scheduling request component 830 may identify that a next transmission is the transmitting the second scheduling request.

The third scheduling request component 835 may transmit, to the base station over the communication link and at the third transmission power, the third scheduling request.

The uplink transmission component 840 may transmit a message to the base station over the communication link before transmitting the first scheduling request. In some examples, a second radio link quality associated with transmitting the first scheduling request is lower than a first radio link quality associated with transmitting the message. In some examples, the first scheduling request is a next transmission to the base station following a transmission time interval associated with the message.

FIG. 9 shows a diagram of a system 900 including a device 905 that supports uplink transmission power determination in accordance with aspects of the present disclosure. The device 905 may be an example of or include the components of device 605, device 705, or a UE 115 as described herein. The device 905 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 910, an I/O controller 915, a transceiver 920, an antenna 925, memory 930, and a processor 940. These components may be in electronic communication via one or more buses (e.g., bus 945) .

The communications manager 910 may establish a communication link with a base station, transmit, to the base station over the communication link and at a first transmission power, a first scheduling request associated with data. The communications manager 910 may also determine, based on transmitting the first scheduling request, whether a control message responsive to the first scheduling request has been received from the base station. The communications manager 910 may further select, based on the first transmission power and determining whether the control message has been received, a second transmission power for a second scheduling request associated with the data, where the second transmission power is greater than the first transmission power. The communications manager 910 may also transmit, to the base station over the communication link and at the second transmission power, the second scheduling request.

The I/O controller 915 may manage input and output signals for the device 905. The I/O controller 915 may also manage peripherals not integrated into the device 905. In some examples, the I/O controller 915 may represent a physical connection or port to an external peripheral. In some examples, the I/O controller 915 may utilize an operating system such as

or another known operating system. In other cases, the I/O controller 915 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some examples, the I/O controller 915 may be implemented as part of a processor. In some examples, a user may interact with the device 905 via the I/O controller 915 or via hardware components controlled by the I/O controller 915.

The transceiver 920 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above. For example, the transceiver 920 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 920 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.

In some examples, the wireless device may include a single antenna 925. However, in some examples the device may have more than one antenna 925, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.

The memory 930 may include random access memory (RAM) and read only memory (ROM) . The memory 930 may store computer-readable, computer-executable code 935 including instructions that, when executed, cause the processor to perform various functions described herein. In some examples, the memory 930 may contain, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The processor 940 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some examples, the processor 940 may be configured to operate a memory array using a memory controller. In other cases, a memory controller may be integrated into the processor 940. The processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks supporting uplink transmission power determination) .

The code 935 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 935 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some examples, the code 935 may not be directly executable by the processor 940 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.

FIG. 10 shows a flowchart illustrating a method 1000 that supports uplink transmission power determination in accordance with aspects of the present disclosure. The operations of method 1000 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1000 may be performed by a communications manager as described with reference to FIGs. 6 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1005, the UE may establish a communication link with a base station. The operations of 1005 may be performed according to the methods described herein. In some examples, aspects of the operations of 1005 may be performed by a link establishment component as described with reference to FIGs. 6 through 9.

At 1010, the UE may transmit, to the base station over the communication link and at a first transmission power, a first scheduling request associated with data. The operations of 1010 may be performed according to the methods described herein. In some examples, aspects of the operations of 1010 may be performed by a first scheduling request component as described with reference to FIGs. 6 through 9.

At 1015, the UE may determine, based on transmitting the first scheduling request, whether a control message responsive to the first scheduling request has been received from the base station. The operations of 1015 may be performed according to the methods described herein. In some examples, aspects of the operations of 1015 may be performed by a control message reception component as described with reference to FIGs. 6 through 9.

At 1020, the UE may select, based on the first transmission power and determining whether the control message has been received, a second transmission power for a second scheduling request associated with the data, where the second transmission power is greater than the first transmission power. The operations of 1020 may be performed according to the methods described herein. In some examples, aspects of the operations of 1020 may be performed by a transmission power component as described with reference to FIGs. 6 through 9.

At 1025, the UE may transmit, to the base station over the communication link and at the second transmission power, the second scheduling request. The operations of 1025 may be performed according to the methods described herein. In some examples, aspects of the operations of 1025 may be performed by a second scheduling request component as described with reference to FIGs. 6 through 9.

FIG. 11 shows a flowchart illustrating a method 1100 that supports uplink transmission power determination in accordance with aspects of the present disclosure. The operations of method 1100 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1100 may be performed by a communications manager as described with reference to FIGs. 6 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1105, the UE may establish a communication link with a base station. The operations of 1105 may be performed according to the methods described herein. In some examples, aspects of the operations of 1105 may be performed by a link establishment component as described with reference to FIGs. 6 through 9.

At 1110, the UE may transmit, to the base station over the communication link and at a first transmission power, a first scheduling request associated with data. The operations of 1110 may be performed according to the methods described herein. In some examples, aspects of the operations of 1110 may be performed by a first scheduling request component as described with reference to FIGs. 6 through 9.

At 1115, the UE may determine, based on transmitting the first scheduling request, whether a control message responsive to the first scheduling request has been received from the base station. The operations of 1115 may be performed according to the methods described herein. In some examples, aspects of the operations of 1115 may be performed by a control message reception component as described with reference to FIGs. 6 through 9.

At 1120, the UE may select, based on the first transmission power and determining whether the control message has been received, a second transmission power for a second scheduling request associated with the data, where the second transmission power is greater than the first transmission power. The operations of 1120 may be performed according to the methods described herein. In some examples, aspects of the operations of 1120 may be performed by a transmission power component as described with reference to FIGs. 6 through 9.

At 1125, the UE may transmit, to the base station over the communication link and at the second transmission power, the second scheduling request. The operations of 1125 may be performed according to the methods described herein. In some examples, aspects of the operations of 1125 may be performed by a second scheduling request component as described with reference to FIGs. 6 through 9.

At 1130, the UE may determine, based on transmitting the second scheduling request, whether a second control message responsive to the second scheduling request has been received from the base station. The operations of 1130 may be performed according to the methods described herein. In some examples, aspects of the operations of 1130 may be performed by a control message reception component as described with reference to FIGs. 6 through 9.

At 1135, the UE may select, based on the second transmission power and determining whether the second control message has been received, a third transmission power for a third scheduling request associated with the data, where the third transmission power is greater than the first transmission power and the second transmission power. The operations of 1135 may be performed according to the methods described herein. In some examples, aspects of the operations of 1135 may be performed by a transmission power component as described with reference to FIGs. 6 through 9.

At 1140, the UE may transmit, to the base station over the communication link and at the third transmission power, the third scheduling request. The operations of 1140 may be performed according to the methods described herein. In some examples, aspects of the operations of 1140 may be performed by a third scheduling request component as described with reference to FIGs. 6 through 9.

It should be noted that the methods described herein describe possible implementations, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods may be combined.

Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.

Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed with a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A 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 in conjunction with a DSP core, or any other such configuration) .

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 on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.

Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by 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 disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave, then the 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 medium. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” ) indicates an inclusive list such that, for example, a list of at least one of 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) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. ”

In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label, or other subsequent reference label.

The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration, ” and not “preferred” or “advantageous over other examples. ” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein, but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

A method for wireless communication at a user equipment (UE) , comprising:

establishing a communication link with a base station;

transmitting, to the base station over the communication link and at a first transmission power, a first scheduling request associated with data;

determining, based at least in part on transmitting the first scheduling request, whether a control message responsive to the first scheduling request has been received from the base station;

selecting, based at least in part on the first transmission power and determining whether the control message has been received, a second transmission power for a second scheduling request associated with the data, wherein the second transmission power is greater than the first transmission power; and

transmitting, to the base station over the communication link and at the second transmission power, the second scheduling request.
The method of claim 1, further comprising:

determining a channel transmission power, wherein the first transmission power and the second transmission power are based at least in part on the channel transmission power.
The method of claim 2, wherein the channel transmission power is based at least in part on one or more of a threshold output power associated with the UE, one or more radio resource control parameters associated with the UE, a downlink pathloss value, an uplink transmission power adjustment, an uplink power control, or any combination thereof.
The method of claim 2, further comprising:

determining a scheduling request power adjustment;

determining an adjusted channel transmission power by combining the scheduling request power adjustment and the channel transmission power; and

comparing the adjusted channel transmission power with a threshold power output associated with the UE, wherein the first transmission power and the second transmission power are based at least in part on comparing the adjusted channel transmission power with the threshold power output associated with the UE.
The method of claim 4, further comprising:

selecting a minimum of the adjusted channel transmission power and the threshold power output associated with the UE, wherein the first transmission power and the second transmission power are based at least in part on selecting the minimum.
The method of claim 4, wherein:

determining the scheduling request power adjustment is based at least in part on a scheduling request power step, a scheduling request counter, and a threshold scheduling request power adjustment.
The method of claim 6, wherein determining the scheduling request power adjustment comprises:

determining a first scheduling power adjustment that is based at least in part on a product of the scheduling request power step and the scheduling request counter;

comparing the first scheduling power adjustment with the threshold scheduling request power adjustment; and

setting the scheduling request power adjustment to a minimum of the first scheduling power adjustment and the threshold scheduling request power adjustment.
The method of claim 7, wherein determining the scheduling request power adjustment further comprises:

identifying that a transmission associated with the scheduling request power adjustment is the transmitting the first scheduling request; and

setting the scheduling request counter to a value of zero based at least in part on identifying that the transmission is the first scheduling request, wherein determining the first scheduling power adjustment is based at least in part on setting the scheduling request counter to the value of zero.
The method of claim 7, wherein determining the scheduling request power adjustment further comprises:

identifying that a transmission associated with the scheduling request power adjustment is the transmitting the second scheduling request;

determining, based at least in part on identifying that the transmission is the second scheduling request, that the control message responsive to the first scheduling request has not been received; and

increasing the scheduling request counter by a value based at least in part on determining that the control message has not been received, wherein determining the first scheduling power adjustment is based at least in part on increasing the scheduling request counter.
The method of claim 7, wherein determining the scheduling request power adjustment further comprises:

identifying that a transmission associated with the scheduling request power adjustment is the transmitting the second scheduling request;

determining, based at least in part on identifying that the transmission is the second scheduling request, that the control message responsive to the first scheduling request has been received; and

setting the scheduling request counter to a value based at least in part on determining that the control message has been received, wherein determining the first scheduling power adjustment is based at least in part on setting the scheduling request counter to the value.
The method of claim 6, further comprising:

configuring, at the UE, the scheduling request power step, a unit associated with the scheduling request counter, and the threshold scheduling request power adjustment.
The method of claim 1, further comprising:

determining, based at least in part on transmitting the second scheduling request, whether a second control message responsive to the second scheduling request has been received from the base station;

selecting, based at least in part on the second transmission power and determining whether the second control message has been received, a third transmission power for a third scheduling request associated with the data, wherein the third transmission power is greater than the first transmission power and the second transmission power; and

transmitting, to the base station over the communication link and at the third transmission power, the third scheduling request.
The method of claim 1, wherein the control message comprises downlink control information that includes a transmit power control command.
The method of claim 13, wherein determining whether the control message responsive to the first scheduling request has been received from the base station comprises:

identifying that a next transmission is the transmitting the second scheduling request;

determining, based at least in part on identifying that the next transmission is the second scheduling request, that the control message responsive to the first scheduling request has been received; and

selecting the second transmission power based at least in part on the transmit power control command included in the control message.
The method of claim 1, wherein the control message comprises downlink control information that includes an indication of uplink transmission resources.
The method of claim 1, further comprising:

determining that the first scheduling request is not identified by the base station based at least in part on determining whether the control message responsive to the first scheduling request has been received.
The method of claim 1, further comprising:

transmitting a message to the base station over the communication link before transmitting the first scheduling request.
The method of claim 17, wherein transmitting the message comprises:

transmitting the message at the first transmission power.
The method of claim 17, wherein a second radio link quality associated with transmitting the first scheduling request is lower than a first radio link quality associated with transmitting the message.
The method of claim 17, wherein the first scheduling request is a next transmission to the base station following a transmission time interval associated with the message.
The method of claim 1, wherein the communication link comprises a frequency division duplexing link or a supplementary uplink link.
The method of claim 21, wherein a rate of change of uplink pathloss is greater than a rate of change of downlink pathloss for a duration before transmitting the first scheduling request associated with the data.
An apparatus for wireless communication at a user equipment (UE) , comprising:

a processor,

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

establish a communication link with a base station;

transmit, to the base station over the communication link and at a first transmission power, a first scheduling request associated with data;

determine, based at least in part on transmitting the first scheduling request, whether a control message responsive to the first scheduling request has been received from the base station;

select, based at least in part on the first transmission power and determining whether the control message has been received, a second transmission power for a second scheduling request associated with the data, wherein the second transmission power is greater than the first transmission power; and

transmit, to the base station over the communication link and at the second transmission power, the second scheduling request.
An apparatus for wireless communication at a user equipment (UE) , comprising:

means for establishing a communication link with a base station;

means for transmitting, to the base station over the communication link and at a first transmission power, a first scheduling request associated with data;

means for determining, based at least in part on transmitting the first scheduling request, whether a control message responsive to the first scheduling request has been received from the base station;

means for selecting, based at least in part on the first transmission power and determining whether the control message has been received, a second transmission power for a second scheduling request associated with the data, wherein the second transmission power is greater than the first transmission power; and

means for transmitting, to the base station over the communication link and at the second transmission power, the second scheduling request.
A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE) , the code comprising instructions executable by a processor to:

establish a communication link with a base station;

transmit, to the base station over the communication link and at a first transmission power, a first scheduling request associated with data;

determine, based at least in part on transmitting the first scheduling request, whether a control message responsive to the first scheduling request has been received from the base station;

select, based at least in part on the first transmission power and determining whether the control message has been received, a second transmission power for a second scheduling request associated with the data, wherein the second transmission power is greater than the first transmission power; and

transmit, to the base station over the communication link and at the second transmission power, the second scheduling request.