TECHNICAL FIELD

The technology discussed in this disclosure relates generally to wireless communication systems and methods, and more particularly to mitigating maximum permissible exposure (MPE) constraints for millimeter wave (mmWave) transmissions with network assistance. Certain embodiments can enable and provide improved communication techniques for a base station (BS) to collect histories or statistics of UL transmission power information from user equipment devices (UEs) and to determine UL transmission configurations for the UEs based on the collected histories or statistics.

INTRODUCTION

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). A wireless multiple-access communications system may include a number of base stations (BSs), each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE).

To meet the growing demands for expanded mobile broadband connectivity, wireless communication technologies are advancing from the LTE technology to a next generation new radio (NR) technology. One technique for expanding connectivity may be to extend the frequency operation range to higher frequencies since lower frequencies are becoming over-crowded. For example, mmWave frequency bands between about 30 gigahertz (GHz) to about 300 GHz can provide a large bandwidth for high data rate communications. However, the mmWave frequency bands may have a higher path-loss compared to the lower frequency bands used by conventional wireless communication systems.

To overcome the higher path-loss, BSs and UEs may use beamforming to form directional links for communications. Practical application of beamforming in mmWave systems needs to overcome a number of constraints from regulatory perspectives. For example, Federal Communications Commission (FCC) and International Commission on Non-Ionizing Radiation Protection (ICNIRP), as well as multiple other regulatory agencies across disparate geographies impose MPE constraints on transmitters at various carrier frequencies. MPE constraints are typically specified in terms of short-term temporal averaging of radiated power, medium-term temporal averaging of radiated power, local-spatial averaging of radiated power, and/or medium-spatial averaging of radiated power. The imposing of the MPE constraints can prevent hazardous operating conditions, ensure users' optimal health, and/or reduce electromagnetic pollution or noise/interference from mmWave transmissions.

In certain mmWave systems, a UE may determine and conform to MPE constraints autonomously or locally at the UE. For example, the UE may detect a distance from an antenna or an antenna array of the UE to a user's body part (e.g., a hand, face, ankle, etc.), determine an MPE constraint based on the detected distance, and transmit using an MPE compliant UL power based on the detected distance. However, the autonomous or local detections and UL power adjustments at the UE may not provide optimal performance.

BRIEF SUMMARY OF SOME EXAMPLES

The following summarizes some aspects of the present disclosure to provide a basic understanding of the discussed technology. This summary is not an extensive overview of all contemplated features of the disclosure, and is intended neither to identify key or critical elements of all aspects of the disclosure nor to delineate the scope of any or all aspects of the disclosure. Its sole purpose is to present some concepts of one or more aspects of the disclosure in summary form as a prelude to the more detailed description that is presented later.

For example, in an aspect of the disclosure, a method of wireless communication includes transmitting, by a first wireless communication device to a second wireless communication device, a plurality of reports, each report indicating an allowable transmission power level at the first wireless communication device satisfying a maximum permissible exposure (MPE) parameter; receiving, by the first wireless communication device from the second wireless communication device, a first configuration based on an MPE profile associated with the first wireless communication device in response to the plurality of reports; and transmitting, by the first wireless communication device to the second wireless communication device, a first communication signal over a first beam based on the first configuration.

In an additional aspect of the disclosure, a method of wireless communication includes receiving, by a first wireless communication device from a second wireless communication device, a plurality of reports, each report indicating an allowable transmission power level at the second wireless communication device satisfying a maximum permissible exposure (MPE) parameter; transmitting, by the first wireless communication device to the second wireless communication device, a first configuration based on an MPE profile associated with the second wireless communication device in response to the plurality of reports; and receiving, by the first wireless communication device from the second wireless communication device, a first communication signal over a first beam based on the first configuration.

In an additional aspect of the disclosure, an apparatus includes a transceiver configured to transmit, to a second wireless communication device, a plurality of reports, each report indicating an allowable transmission power level at the apparatus satisfying a maximum permissible exposure (MPE) parameter; receive, from the second wireless communication device, a first configuration based on an MPE profile associated with the apparatus in response to the plurality of reports; and transmit, to the second wireless communication device, a first communication signal over a first beam based on the first configuration.

In an additional aspect of the disclosure, an apparatus includes a transceiver configured to receive, from a second wireless communication device, a plurality of reports, each report indicating an allowable transmission power level at the second wireless communication device satisfying a maximum permissible exposure (MPE) parameter; transmit, to the second wireless communication device, a first configuration based on an MPE profile associated with the second wireless communication device in response to the plurality of reports; and receive, from the second wireless communication device, a first communication signal over a first beam based on the first configuration.

In an additional aspect of the disclosure, a computer-readable medium having program code recorded thereon, the program code includes code for causing a first wireless communication device to transmit, to a second wireless communication device, a plurality of reports, each report indicating an allowable transmission power level at the first wireless communication device satisfying a maximum permissible exposure (MPE) parameter; code for causing the first wireless communication device to receive, from the second wireless communication device, a first configuration based on an MPE profile associated with the first wireless communication device in response to the plurality of reports; and code for causing the first wireless communication device to transmit, to the second wireless communication device, a first communication signal over a first beam based on the first configuration.

In an additional aspect of the disclosure, a computer-readable medium having program code recorded thereon, the program code includes code for causing a first wireless communication device to receiving, from a second wireless communication device, a plurality of reports, each report indicating an allowable transmission power level at the second wireless communication device satisfying a maximum permissible exposure (MPE) parameter; code for causing the first wireless communication device to transmit, to the second wireless communication device, a first configuration based on an MPE profile associated with the second wireless communication device in response to the plurality of reports; and code for causing the first wireless communication device to receive, from the second wireless communication device, a first communication signal over a first beam based on the first configuration.

In an additional aspect of the disclosure, an apparatus includes means for transmitting, to a second wireless communication device, a plurality of reports, each report indicating an allowable transmission power level at the apparatus satisfying a maximum permissible exposure (MPE) parameter; means for receiving, from the second wireless communication device, a first configuration based on an MPE profile associated with the apparatus in response to the plurality of reports; and means for transmitting, to the second wireless communication device, a first communication signal over a first beam based on the first configuration.

In an additional aspect of the disclosure, an apparatus includes means for receiving, from a second wireless communication device, a plurality of reports, each report indicating an allowable transmission power level at the second wireless communication device satisfying a maximum permissible exposure (MPE) parameter; means for transmitting, to the second wireless communication device, a first configuration based on an MPE profile associated with the second wireless communication device in response to the plurality of reports; and means for receiving, from the second wireless communication device, a first communication signal over a first beam based on the first configuration.

Other aspects, features, and embodiments of the present invention will become apparent to those of ordinary skill in the art, upon reviewing the following description of specific, exemplary embodiments of the present invention in conjunction with the accompanying figures. While features of the present invention may be discussed relative to certain embodiments and figures below, all embodiments of the present invention can include one or more of the advantageous features discussed herein. In other words, while one or more embodiments may be discussed as having certain advantageous features, one or more of such features may also be used in accordance with the various embodiments of the invention discussed herein. In similar fashion, while exemplary embodiments may be discussed below as device, system, or method embodiments it should be understood that such exemplary embodiments can be implemented in various devices, systems, and methods.

