WO2021223246A1

WO2021223246A1 - Power management report

Info

Publication number: WO2021223246A1
Application number: PCT/CN2020/089280
Authority: WO
Inventors: Tero Henttonen; Samuli Turtinen; Chunli Wu; Sami Hakola
Original assignee: Nokia Shanghai Bell Co., Ltd.; Nokia Solutions And Networks Oy; Nokia Technologies Oy
Priority date: 2020-05-08
Filing date: 2020-05-08
Publication date: 2021-11-11
Also published as: CN113630858B; CN113630858A

Abstract

Example embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of enhancing a report for power reduction. The method comprises in accordance with a determination of a demand for reporting a power reduction to be applied on at least one of serving cells of a first device, determining, at the first device, a reporting scheme for the at least one of the serving cells based on at least one parameter related to the power reduction; and transmitting, to the second device, a power management report containing information about the power reduction based on the reporting scheme. In this way, the terminal device can report the output power reduction to the network device in a timely and reliable manner, and the power reduction report may be transmitted based on different reporting schemes depending on a power reduction level. As such, the radio link failure can be avoided, and the transmission of the terminal device can be improved.

Description

POWER MANAGEMENT REPORT

FIELD

Embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to devices, methods, apparatus and computer readable storage media of reporting a power reduction.

BACKGROUND

As the number of online services dramatically increases every year, the thirst for bandwidth is insatiable. The millimeter-wave (mmW) spectrum offers a possibility of using large portions of contiguous bandwidth to address high-throughput applications. Hence, the 5th Generation (5G) New Radio (NR) frequency spectrum extends well-above the previous 4th Generation (4G) one, which was ranging from 400 MHz to 6 GHz -otherwise known as Frequency Range 1 (FR1) . In mmWave 5G NR, Frequency Range 2 (FR2) comprises the frequencies between 24 GHz and 52.6 GHz, and extending the NR operation into the 52.6-114 GHz range is currently being discussed. However, operating at such high frequencies with high gain antennas has raised concerns for the health of the users.

There is a standard on mmWave regime that specifies and regulates the maximum power for the User Equipment (UE) . Since frequencies below 100 GHz are non-ionizing, the concern for health is limited to thermal heating of the body tissue while absorbing electromagnetic mmW energy. The mmW frequencies yield penetration depths below 1 mm, therefore possible thermal damage is limited to the surface of the skin and the eyes. Most of the energy is absorbed within the first 0.4 mm of the human skin at 42 GHz.

SUMMARY

In general, example embodiments of the present disclosure provide a solution of reporting output power reduction.

In a first aspect, there is provided a first device. The first device comprises at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the first device at least to in accordance with a determination of a demand for reporting a power reduction to be applied on at least one of serving cells of the first device, determine a reporting scheme for the at least one of the serving cells based on a parameter related to a power reduction; and transmit, to the second device, a power management report containing information about the power reduction based on the reporting scheme.

In a second aspect, there is provided a second device. The second device comprises at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the second device at least to receive a power management report from a first device, the power management report containing information about a power reduction to be applied on at least one of serving cells of the first device; and control a transmission on a second serving cell of the first device based on the information.

In a third aspect, there is provided a method. The method comprises in accordance with a determination of a demand for reporting a power reduction to be applied on at least one of serving cells of a first device, determining, at the first device, a reporting scheme for the at least one of the serving cells based on a parameter related to the power reduction; and transmitting, to the second device, a power management report containing information about the power reduction based on the reporting scheme.

In a fourth aspect, there is provided a method. The method comprises receiving, at a second device, a power management report from a first device, the power management report containing information about a power reduction to be applied on at least one of serving cells of the first device; and controlling a transmission on a second serving cell of the first device based on the information.

In a fifth aspect, there is provided an apparatus comprising means for in accordance with a determination of a demand for reporting a power reduction to be applied on at least one of serving cells of the first device, determining a reporting scheme for the at least one of the serving cells based on a parameter related to the power reduction; and means for transmitting, to the second device, a power management report containing information about the power reduction based on the reporting scheme.

In a sixth aspect, there is provided an apparatus comprising means for receiving a power management report from a first device, the power management report containing information about a power reduction to be applied on at least one of serving cells of the first device; and means for controlling a transmission on a second serving cell of the first device based on the information.

In a seventh aspect, there is provided a computer readable medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to carry out the method according to the third aspect.

In an eighth aspect, there is provided a computer readable medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to carry out the method according to the fourth aspect.

Other features and advantages of the embodiments of the present disclosure will also be apparent from the following description of specific embodiments when read in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of embodiments of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the disclosure are presented in the sense of examples and their advantages are explained in greater detail below, with reference to the accompanying drawings, where

FIG. 1 shows an example environment in which example embodiments of the present disclosure can be implemented;

FIG. 2 shows the allowed maximum EIRP depending on the separation distance between the terminal device and the user according to some example embodiments of the present disclosure;

FIG. 3 shows a signaling chart illustrating a process of reporting the power reduction according to some example embodiments of the present disclosure;

FIG. 4 shows a flowchart of an example method of reporting the power reduction according to some example embodiments of the present disclosure;

FIG. 5 shows a signaling chart illustrating a process of reporting the output power reduction according to some example embodiments of the present disclosure;

FIG. 6 shows a signaling chart illustrating a process of reporting the output power reduction according to some example embodiments of the present disclosure;

FIG. 7 shows a flowchart of an example method of reporting the power reduction according to some example embodiments of the present disclosure;

FIG. 8 shows a simplified block diagram of a device that is suitable for implementing example embodiments of the present disclosure; and

Fig. 9 shows a block diagram of an example computer readable medium in accordance with some embodiments of the present disclosure.

Throughout the drawings, the same or similar reference numerals represent the same or similar element.

DETAILED DESCRIPTION

Principle of the present disclosure will now be described with reference to some example embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. The disclosure described herein can be implemented in various manners other than the ones described below.

In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.

References in the present disclosure to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an example embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

It shall be understood that although the terms “first” and “second” etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish functionalities of various elements. As used herein, the term “and/or” includes any and all combinations of one or more of the listed terms.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a” , “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” , “comprising” , “has” , “having” , “includes” and/or “including” , when used herein, specify the presence of stated features, elements, and/or components etc., but do not preclude the presence or addition of one or more other features, elements, components and/or combinations thereof.

As used in this application, the term “circuitry” may refer to one or more or all of the following:

(a) hardware-only circuit implementations (such as implementations in only analog and/or digital circuitry) and

(b) combinations of hardware circuits and software, such as (as applicable) :

(i) a combination of analog and/or digital hardware circuit (s) with software/firmware and

(ii) any portions of hardware processor (s) with software (including digital signal processor (s) ) , software, and memory (ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and

(c) hardware circuit (s) and or processor (s) , such as a microprocessor (s) or a portion of a microprocessor (s) , that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation.

This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware. The term circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.

As used herein, the term “communication network” refers to a network following any suitable communication standards, such as fifth generation (5G) systems, Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Narrow Band Internet of Things (NB-IoT) and so on. Furthermore, the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the future fifth generation (5G) new radio (NR) communication protocols, and/or any other protocols either currently known or to be developed in the future. Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system.

As used herein, the term “network device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom. The network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a NR Next Generation NodeB (gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, a low power node such as a femto, a pico, and so forth, depending on the applied terminology and technology. The network device is allowed to be defined as part of a gNB such as for example in CU/DU split in which case the network device is defined to be either a gNB-CU or a gNB-DU.

The term “terminal device” refers to any end device that may be capable of wireless communication. By way of example rather than limitation, a terminal device may also be referred to as a communication device, user equipment (UE) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) . The terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, wireless customer-premises equipment (CPE) , an Internet of Things (IoT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device and applications (e.g., remote surgery) , an industrial device and applications (e.g., a robot and/or other wireless devices operating in an industrial and/or an automated processing chain contexts) , a consumer electronics device, a device operating on commercial and/or industrial wireless networks, and the like. The terminal device may also correspond to Mobile Termination (MT) part of the integrated access and backhaul (IAB) node (a.k.a. a relay node) . In the following description, the terms “terminal device” , “communication device” , “terminal” , “user equipment” and “UE” may be used interchangeably.

Although functionalities described herein can be performed, in various example embodiments, in a fixed and/or a wireless network node, in other example embodiments, functionalities may be implemented in a user equipment apparatus (such as a cell phone or tablet computer or laptop computer or desktop computer or mobile IoT device or fixed IoT device) . This user equipment apparatus can, for example, be furnished with corresponding capabilities as described in connection with the fixed and/or the wireless network node (s) , as appropriate. The user equipment apparatus may be the user equipment and/or or a control device, such as a chipset or processor, configured to control the user equipment when installed therein. Examples of such functionalities include the bootstrapping server function and/or the home subscriber server, which may be implemented in the user equipment apparatus by providing the user equipment apparatus with software configured to cause the user equipment apparatus to perform from the point of view of these functions/nodes.

As mentioned above, in wireless communication network, there are two frequency ranges, namely, the frequency range 1 (FR1) ranging from 400 MHz to 6 GHz and the frequency range 2 (FR2) ranging from 24 GHz to 114 GHz. For the serving cell operating at relatively high frequencies, for example, at FR2 and above, they require high gain antennas to maintain the link budget. However, high gain antennas direct a lot of energy that might come towards the user. Governmental exposure guidelines are in place to prevent health issues due to thermal effects. For frequencies below 6 GHz (e.g. LTE) , Specific Absorption Rate (SAR) has been used to determine the exposure threshold. The SAR level measures the energy absorbed by the human body when exposed to electromagnetic fields. The SAR limitation in the U.S. is 1.6 W/kg averaged over 1 g tissue from Federal Communication Commission (FCC) , while in Europe the SAR limitation is 2 W/kg averaged over 10 g tissue. The 1 g averaging provides a finer resolution for the study of energy absorption in the human body. At mmWave regime where the penetration depth is below 1 mm, even 1 g tissue is in fact a rather large volume. Being difficult to define a meaningful volume for SAR evaluation, it has been commonly accepted to use Power Density (PD) instead of SAR to set the restrictions on exposure at mmWave frequencies. It is thus a planar energy distribution as opposed to a volumetric one.

For the purpose of protecting the user health, maximum permissible exposure (MPE) regulations specifies a MPE threshold and the terminal device must always comply with the MPE. As such, if the user comes in close vicinity of the antenna or the user is exposed to the radiated beam, the terminal device has to reduce its output power. The allowed maximum EIRP of the terminal device is related to a separation distance between the terminal device and the user’s body. The Maximum Permissible Exposure (MPE) is a regulation on PD for the mmWave regime. The FCC and the International Commission on Non-Ionizing Radiation Protection (ICNIRP) have set a threshold for MPE at 10W/m2 (1 mW/cm2) , for the general public, between 6 GHz or 10 GHz respectively and 100 GHz. The energy absorbed by the human body increases as a function of the distance to a terminal device. Therefore, to comply with the MPE limit, the terminal device might have to reduce its output power if the user gets in close vicinity of the antenna. FIG. 2 shows the allowed maximum EIRP depending on the separation distance between the terminal device and the user. As shown in FIG. 2, when the user is nearly touching the antenna, the reduction of the allowed peak EIRP is more than 20 dBm for a PC3 UE.

On the other hand, the reduction of the maximum allowed EIRP dramatically impacts the range of the UE, thus deteriorating the signal quality (e.g., CQI, RSRP, RSRQ, and the like) received from the serving cell 130. The concern is that significantly reducing the output power (at least 20 dB for PC3 UESs) is likely to lead to losing the connection to the base station (gNB) , and a Radio Link Failure (RLF) due the UE not being able to successfully send almost any information via the link to the network, which will eventually trigger the RLF at either UE or network side, but will take typically more than 1 second. Currently, the terminal device may trigger a power management maximum power reduction (P-MPR) event and transmit the report based on a reporting process of power headroom report (PHR) , but only an indication that P-MPR is applied can be included and the exact P-MPR value will not be reported to the network. However, the required power reduction may be too high to maintain the current link, or the power reduction may be applied before the network knows about the power reduction event. Thus, the signal from the terminal device including the report may not be able to reach the network device if sent using the link requiring the P-MPR application. Even if in some cases the power reduction event can reach the network device, it can only be transmitted in a delayed manner. This is because the PHR event alone does not trigger a buffer status request reporting at UE, and thus no scheduling request being triggered for reporting the event. In such a case, the report cannot be reported until there is data transmission occurring at the terminal device. After transmitting the report, the terminal device may still be disconnected from the network due to the power reduction.

Therefore, the embodiments of the present disclosure propose an approach for fast reporting of the power reduction event occurred at the terminal device. The reporting of the power reduction may be in a form of a power management maximum power reduction (P-MPR) report within an existing signalling or an entirely new signalling. When a power reduction event is triggered, the terminal device may select a reporting scheme based on at least one of a power reduction level, configuration parameters of the terminal device and network conditions, and transmit the power management report including the information about the power reduction event to the network device based on the reporting scheme. In this way, the terminal device can report the output power reduction to the network in a timely and reliable manner, which may in turn assist the terminal device on scheduling transmissions on different serving cells. As such, the radio link failure can be avoided, and the transmission of the terminal device can be improved.

FIG. 1 shows an example communication network 100 in which embodiments of the present disclosure can be implemented. As shown in FIG. 1, the communication network 100 comprises terminal devices 110-1 and 110-2 (collectively referred as first device 110, or also referred to as first devices 110-1 and 110-2) . The communication network 100 further comprises second devices 120-1 and 120-2 (hereinafter may also be collectively referred to as the second device 120 or referred to as a second device 120-1 and a third device 120-2, respectively) . The first device 110 may communicate with the second device 120. For example, the first device 110 may be served by at least one of serving cells 130-1 to 130-4 (collectively referred to as the serving cell 130) managed by the second device 120. The second device 120-1 and second device 120-2 may communicate with each other.

In a carrier aggregation scenario, the first device 110 may be simultaneously served by more than one serving cell including one primary cell and at least one secondary cell. In this case, the serving cells 130-1 to 130-4 may be controlled by different second devices 120-1 and 120-2, respectively. For example, serving cells 130-1 and 130-2 may be controlled by the second device 120-1, while serving cells 130-3 and 130-4 may be controlled by the second device 120-2. In a dual connectivity scenario, the serving cells 130-1 and 130-2 may be grouped into a master cell group (MCG) with the serving cell 130-1 serving as a primary cell, and the serving cells 130-3 and 130-4 may be grouped into a secondary cell group (SCG) . In another case, the serving cells 130-1 to 130-4 may operate on the frequency ranges. For example, the serving cells 130-1 and 130-2 may be FR2 type of serving cells, and the serving cells 130-3 and 130-4 may be FR1 type of serving cells.

It is also to be understood that the number of network devices, terminal devices and serving cells shown in FIG. 1 is given for the purpose of illustration without suggesting any limitations.

Depending on the communication technologies, the network 100 may be a Code Division Multiple Access (CDMA) network, a Time Division Multiple Address (TDMA) network, a Frequency Division Multiple Access (FDMA) network, an Orthogonal Frequency-Division Multiple Access (OFDMA) network, a Single Carrier-Frequency Division Multiple Access (SC-FDMA) network or any others. Communications discussed in the network 100 may conform to any suitable standards including, but not limited to, New Radio Access (NR) , Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) , cdma2000, and Global System for Mobile Communications (GSM) and the like. Furthermore, the communications may be performed according to any generation of communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols. The techniques described herein may be used for the wireless networks and radio technologies mentioned above as well as other wireless networks and radio technologies. For clarity, certain aspects of the techniques are described below for LTE, and LTE terminology is used in much of the description below.

In the network 100, the first device 110 and second device 120 may communicate with each other via a beam transmitted along an unobstructed path. For example, the first device 110-1 may communicate with the second device 120-2 via a beam that is transmitted via a Line of Sight (LOS) path, and in this case the Effective Isotropic Radiated Power (EIRP) of the first device 110 peaks at around +34 dBm. In some cases, a body of a user of the first device 110 may be exposed to the radiated beam. For example, the user of the first device 110-2 obstructs the path of the beam transmitted to the second device 120 and the user’s body is exposed to the radiated beam.

Principle and implementations of the present disclosure will be described in detail below with reference to FIGs. 3 to 7. FIG. 3 shows a signaling chart illustrating a process of reporting power reduction according to some example embodiments of the present disclosure. For the purpose of discussion, the process 300 will be described with reference to FIG. 1. The process 300 may involve the first device 110 and the second device 120.

As described above with connection with FIGs. 1-2, in a case where the first device 110 is required to reduce its output power, the first device 110 may trigger a power reduction event including reducing the output power immediately or in the future. Depending on the power reduction level of the output power, the first device 110 determines 310 there is a demand for reporting the power reduction to the second device 120. In some embodiments, the first device 110 may determine a value of the power reduction, ΔP, and compare the value ΔP with a preconfigured threshold value for triggering reporting of the power reduction, for example, a first threshold value P ₁. For example, the first threshold value P ₁ may be configured by the second device 120. If the value ΔP exceeds the first threshold value P ₁, the first device 110 may determine that the power reduction event may result in a degradation of the transmission power on the serving cells 130 of the first device 110, and there is a demand for reporting the power reduction to the second device 120.

In order to transmit the power management report, the first device 110 determines 320 a reporting scheme based on at least one parameter related to the power reduction. In some embodiments, the reporting scheme may be determined based on a random access procedure or a scheduling request procedure, which will be discussed below in details. The first device 110 transmits 330 the power management report to the second device 120 based on the reporting scheme. Upon receipt the power management report from the first device 110, the second device 120 obtains the information included in the report. The information is about the power reduction to be applied on at least one of the serving cells 130. The second device 120 then controls 340 a transmission on the serving cell 130 of the first device 110 based on the information.

FIG. 4 shows a flowchart of an example method of reporting the power reduction according to some example embodiments of the present disclosure. The method 400 can be implemented at a terminal device, e.g., the first device 110 described with reference to FIG. 1.

At 410, if the first device 110 determines that there is a demand for reporting the power reduction to be applied on at least one of the serving cells 130, the first device 110 determines the reporting scheme for the at least one of the serving cells based on at least one parameter related to the power reduction.

As mentioned above, the first device 110 may determine whether the reporting scheme is based on the random access procedure or the scheduling request procedure depending on the one or more parameters. For the serving cell 130 managed by the second device 120, if the power reduction level of the first device 110, such as the value of the power reduction, exceeds a threshold level of power reduction associated with the serving cell 130, then the transmission power on the corresponding serving cell may be degraded, resulting in the radio link failure.

In some embodiments, the parameter for determining the reporting scheme in 410 may include the value of the power reduction ΔP of the first device 110. The first device 110 may compare the value ΔP with a threshold value for triggering the random access procedure, for example, the second threshold value P ₂. The second threshold value P ₂ is higher than the first threshold P ₁. If the value ΔP exceeds the second threshold value P ₂, the first device 110 determines that the reporting scheme is based on the random access procedure. If the value ΔP does not exceed the second threshold value P ₂, the first device 110 determines that the reporting scheme is based on the scheduling request procedure.

In some embodiment, the parameter may indicate the power reduction levels (e.g., a few or several dBs) associated with the serving cells 130-1 to 130-4 of the first device 110. The first device 110 may determine that the power reduction is to be applied on all of the serving cells 130-1 to 130-4. In this case, the first device 110 may determine the reporting scheme based on the random access procedure, since the requirement of transmission power of the random access procedure may be lower or less strict than that of the scheduling request procedure. In another case, the first device 110 may compare respective power reduction levels associated with corresponding serving cells 130-1 to 130-4 with a first threshold level, for example, L ₁. If the first device 110 determines that all of the serving cells 130-1 to 13-4 are associated with a corresponding power reduction level that exceeds the first threshold level L ₁, the first device 110 determines the reporting scheme based on the random access procedure.

In some embodiments, the parameter for determining the reporting scheme in 410 may include a power reduction level (e.g., a few or several dBs) associated with the serving cells 130. As discussed above, the power management maximum power reduction may be performed mainly on the servings cell of a FR2 type due to their high operation frequencies. The first device 110 may determine to transmit the power reduction report on the serving cells 130 of the FR1 type. Alternatively, if the power reduction level associated with the serving cells of the FR2 type does not exceed a threshold level, the first device 110 may determine to transmit the power reduction report on these FR2 type serving cells 130. For example, the serving cells 130-2 is preconfigured for performing the scheduling request procedure between the first device 110 and the second device 120-1, and the power reduction is to be applied on the serving cells 130-2. In this case, if the first device 110 determines that the power reduction level of the serving cell 130-2 does not exceed a second threshold level L ₂, the first device 110 may determine that the transmission power on the serving cell 130-2 may not be degraded due to the power reduction, and thus the scheduling request procedure may be performed successfully. The first device 110 may then determine the reporting scheme based on the scheduling request procedure.

The first device 110 may prioritize and select a beam to be transmitted for performing the random access procedure, and another beam to be transmitted for performing the scheduling request procedure. If the power reduction is not performed on a beam transmitted to the serving cell 130, or alternatively, if the direction of the beam is not affected by the power reduction, then the transmission power on a corresponding serving cell 130 may be not degraded due to the power reduction.

In some embodiments, the parameter for determining the reporting scheme in 410 may indicate the beam selected for performing the random access procedure, for example, the index of a first beam prioritized by the first device 110. The first device 110 may determine whether the power reduction is performed on the first beam or alternatively, the power reduction level of the first beam is too large to report the power reduction event. For example, the first device 110 may determine a power reduction level of the first beam (e.g., a few or several dBs) , and compare it with a first predetermined threshold level P _1’. If the power reduction level does not exceed the first predetermined threshold level P _1’, the first device 110 determines that the first beam is prioritized for performing the random access procedure, and also available for reporting the power reduction event. Alternatively, the first device 110 may determine whether the direction of the first beam is affected by the power reduction. If the first device 110 determines that the direction of the first beam is not affected by the power reduction, the terminal device 110 may determine the reporting scheme based on the random access procedure.

In some embodiments, the parameter for determining the reporting scheme in 410 may indicate the beam selected for performing the scheduling request procedure, for example, the index of a second beam prioritized by the first device 110. The first device 110 may determine whether the power reduction is performed on the second beam (e.g., a few or several dBs) or alternatively, the power reduction level of the second beam is too large to report the power reduction event. For example, the first device 110 may determine a power reduction level of the second beam, and compare it with a second predetermined threshold level P _2’. If the power reduction level does not exceed the second predetermined threshold level P _2’, the first device 110 determines that the second beam is prioritized for performing the scheduling request procedure and also available for reporting the power reduction event. Alternatively, the first device 110 may determine whether the direction of the second beam is affected by the power reduction. If the first device 110 determines that the direction of the second beam is not affected by the power reduction, the first device 110 may determine the reporting scheme based on scheduling request procedure. The first predetermined threshold level P _1’ and the second predetermined threshold level P _2’ may be preconfigured by the second device 120.

In the wireless communication, there is limit on a number of the transmitting of the scheduling request for initiating the scheduling request procedure between the first device 110 and the second device 120. In some embodiments, the parameter for determining the reporting scheme in 410 may indicate the number of scheduling requests being transmitted by the first device 110. If the first device 110 determines that the number of the scheduling requests being transmitted exceeds the maximum number for transmitting the scheduling request, the first device 110 may not continue to attempt the initiation of the scheduling request procedure. In this case, the first device 110 may determine the reporting scheme based on the random access procedure.

Dedicated resources, for example, the dedicated resources on PUCCH may be preconfigured by the network, such as the second device 120, for performing the reporting of power reduction. In some embodiment, the parameter for determining the reporting scheme in 410 may indicate whether there is a dedicated resource available for reporting the power reduction. If the first device 110 determines that the dedicated resource for a random access procedure that is specific to reporting the power reduction is available, the first device 110 may determine the reporting scheme based on the random access procedure. Similarly, if the first device 110 determines that the dedicated resource for the scheduling request procedure that is specific to reporting the power reduction is available, the first device 110 may determine the reporting scheme based on the scheduling request procedure.

At 420, the first device 110 transmits, to the second device 120, the power management report containing information about the power reduction based on the reporting scheme. The information about the power reduction may include the value of the power reduction to be applied. In some embodiments, the power management report may be a power management power reduction (P-MPR) report transmitted via a higher layer signaling, for example, a MAC control element (CE) . The MAC CE may be a common MAC CE for PHR, or a dedicated or enhanced MAC CE specific for P-MPR.

In a case where more than one second device 120 is serving the first device 110, for example, the first device 110-1 is served by both the second devices 120-1 and 120-2 and the transmission between the first device 110-1 and the second device 120-1 is degraded due to the power reduction, in addition to transmitting the power management report to the second device 120-1, the first device 110-1 may further transmit the report to the second device 120-2. Specifically, the first device 110 may determine that at least one of serving cells 130, such as serving cells 130-3 and 130-4, is managed by the second device 120-2, and transmit the power reduction report to the second device 120-2. Although the transmission power on the serving cells 130-3 and 130-4 may not be necessarily degraded due to the output power reduction, the second device 120-2 may adjust transmissions to be scheduled on the serving cells 130-3 and 130-4 accordingly. In awareness of the degradation of the transmission power between the first device 110-1 and second device 120-1, the second device 120-2 may increment data transmissions on the serving cell 130-3 and 130-4 on which the links are relatively steady and the transmission powers are not degraded due to the power management maximum power reduction.

FIG. 5 shows a signalling chart illustrating a process of reporting the output power reduction based on the random access procedure according to some example embodiments of the present disclosure. For the purpose of discussion, the process 500 will be described with reference to FIG. 1. It is to be understood that the process 500 may include additional acts not shown and/or may omit some acts as shown, and the scope of the present disclosure is not limited in this regard. In addition, it will be appreciated that, although primarily presented herein as being performed serially, at least a portion of the acts of the process 500 may be performed contemporaneously or in a different order than as presented in Fig. 5.

Similar with process 300 shown in FIG. 3, in process 500, the first device 110 determines 505 there is a demand for reporting the power reduction to the second device 120. The first device 110 determines 510 the reporting scheme based on parameter related to power reduction between the first device 110 and the second device 120. In this case, the first device 110 determines the reporting scheme based on the random access procedure. Or alternatively, the random access procedure is predetermined to be used for reporting the power reduction to be applied. The random access procedure may be a contention-based random access (CBRA) or a contention-free random access (CFRA) . The present disclosure is not limited in this aspect.

The random access procedure may include a 2-step random access or a 4-step random access. Both types of random access procedures support the CBRA and the CFRA. In 4-step random access procedure, the first device 110 may start the RACH process by transmitting a Random Access (RA) Preamble to the second device 120. The message for transmitting the random access Preamble may be referred to as “MSG1” . If the second device 120 receives the RA Preamble successfully, the network device may respond with a Random Access Response (RAR) which contains, for example, the identifier of the detected preamble, the time-advance, a temporary Cell-RadioNetworkTemporaryIdentifier (C-RNTI) and an uplink grant for scheduling a PhysicalUplinkSharedChannel (PUSCH) transmission by the first device 110. The message for transmitting the RAR may be referred to as “MSG2” . Then the first device 110 may transmit a scheduled transmission to the network device, which may be referred to as “MSG3” . If the scheduled transmission is successfully received, the second device 120 may send a contention resolution message to indicate whether there was contention or whether the transmission by the first device 110 was successful, which may be referred to as “MSG4. ”

In 2-step random process, the number of round-trips required until the RACH process is reduced from 2 round-trips to 1. This is achieved by transmitting both “MSG1” and “MSG3” in a message called “MSGA” and by further combining “MSG2” and “MSG4” into a message called “MSGB. ” In some embodiments, if the first device 110 determines that the reporting scheme based on the 2-step random access procedure, the terminal device transmits the power management report on a preconfigured resource on PUCCH, e.g., in the MSG A.

In the case where the reporting scheme is based on the 4-step random access procedure, the first device 110 transmits 515 the RA Preamble, i.e., in the MSG1, to the second device 120. In this case, the RA Preamble may indicate the power reduction to be applied. For example, the RA preamble may include an indicator for indicating the power reduction of the first device 110, such as a bit in the RA Preamble that is set to indicate the power reduction event occurred at first device 110. The first device 110 may receive 520 a message, for example, the MSG2, indicative of resources allocated for the transmission from the second device 120.

In this case, the first device 110 may determine when to transmit the RA preamble to request resources for reporting the power reduction. In the embodiments where the parameter indicates the value of the power reduction ΔP, the first device 110 may compare the value of the power reduction ΔP with a threshold value, such as a third threshold value P ₃, for triggering the random access preamble. The third threshold value P ₃ may be higher than the first threshold value P ₁ for triggering reporting of the power reduction. If the first device 110 determines that the value ΔP exceeds the third threshold value P ₃, i.e., ΔP＞P ₃, the first device 110 may determine that the power reduction event is needed to be reported immediately, and thus the random access preamble is required to be transmitted. In other words, the first device 110 determines to transmit the random access preamble to the second device 120 immediately after determining the demand for reporting the power reduction. Otherwise, tf the first device 110 determines that the value ΔP does not exceeds the third threshold value P ₃, i.e., ΔP ≤P ₃, the first device 110 determines to transmit the random access preamble to the second device 120 upon data to be scheduled occurs at the first device 110. The first device 110 may subsequently transmit the power reduction report during the random process procedure.

The indicator included in the RA preamble may indicates the second device 120 to allocate resources on a serving cell 130 on which a transmission power is not degraded due to the power reduction. For example, in awareness of the power reduction event occurred at the first device 110, which may lead to a radio link failure, the second device 120 may select a FR 1 serving cell, i.e., the serving cell 130-2 for providing resources for the transmission. The first device 110 may transmit 525 the power management report, such as in MSG3, on the allocated resources to the second device 120. Upon receiving the power management report, the second device 120 may transmit 530 the MSG4 to the first device 110. The second device 120 may control 535 the transmission on the serving cells 130 based on the information.

FIG. 6 shows a signaling chart illustrating a process of reporting the output power reduction according to some example embodiments of the present disclosure. For the purpose of discussion, the process 600 will be described with reference to FIG. 1. The process 600 may involve the first device 110 and the second device 120. It is to be understood that the process 600 may include additional acts not shown and/or may omit some acts as shown, and the scope of the present disclosure is not limited in this regard. In addition, it will be appreciated that, although primarily presented herein as being performed serially, at least a portion of the acts of the process 600 may be performed contemporaneously or in a different order than as presented in Fig. 6.

Similar with process 300 shown in FIG. 3, in process 600, the first device 110 determines 605 there is a demand for reporting the power reduction to the second device 120. The first device 110 determines 610 the reporting scheme based on parameter related to the power reduction to be applied. In this case, the first device 110 determines the reporting scheme based on the scheduling request procedure. Or alternatively, the scheduling request procedure is predetermined to be used for reporting the power reduction to be applied

In order to obtain resources for performing the scheduling transmission on physical uplink control channel (PUCCH) , the first device 110 transmit 615 a request for resource allocation to the second device 120. In this case, the request may be for example the scheduling request and selectively, the scheduling request may indicate the power reduction event occurred at the first device 110. The second device 120 may transmit 620 a response indicative of resources allocated for the transmission. For example, the second device 120 may transmit an uplink grant to the first device 110. The response may indicate the second device 120 to allocate resources on a serving cell 130 on which a transmission power is not degraded due to the power reduction. For example, in awareness of the power reduction event occurred at the first device 110, which may lead to a radio link failure, the second device 120 may select a FR 1 serving cell, i.e., the serving cell 130-2 for providing resources for the transmission. Upon receiving the response, the first device 110 may transmit 625 the power management report on the allocated resources to the second device 120. The second device 120 may control 630 the transmission on the serving cell 130 based on the information.

In some embodiments, the first device 110 may transmit the request for allocating resource for the power management report immediately after determining the demand for reporting the power reduction. Alternatively, in other embodiments, the first device 110 may transmit the request for allocating resource for the power management report upon data transmission to be scheduled between the first device 110 the second device 120 occurs.

In order to determine when to transmit the scheduling request for allocating resources for reporting the power reduction, , the first device 110 may compare the value of the power reduction ΔP of the first device 110 with a threshold value, for example a fourth threshold value P ₄, for triggering the scheduling request procedure. In this case, the fourth threshold value P ₄ may be higher than the first threshold value P ₁ for triggering reporting of the power reduction. If the first device 110 determines that the value ΔP exceeds the fourth threshold value P ₄, i.e., ΔP＞P ₄, the first device 110 may determine that the power reduction event is needed to be reported immediately and thus the scheduling request is required to be transmitted. In other words, the first device 110 determines to transmit the scheduling request as the request for resource allocation immediately after determining the demand for reporting the power reduction. Otherwise, if the first device 110 determines that the value ΔP does not exceeds the fourth threshold value P ₄, i.e., ΔP ≤P ₄, the first device 110 determines to transmit the scheduling request to the second device 120 upon the data to be scheduled occurs at the first device 110.

FIG. 7 shows a flowchart of an example method of reporting the power reduction according to some example embodiments of the present disclosure. The method 700 can be implemented at a network device, e.g., the second device 120 described with reference to FIG. 1.

At 710, the second device 120 receives the power management report from the first device 110. The power management report may contain information about the power reduction to be applied on at least one of serving cells 130-1 to 130-4.

At 720, the second device 120 controls the transmission on the serving cell 130 of the first device 110 based on the information. The serving cell 130 may be managed by the second device 120-1 or 120-2.

In some embodiments, the second device 120 may obtain, from the information, the value of the power reduction ΔP and selectively, the cell identifiers of the serving cell 130 on which the transmission power is degraded due to the power reduction. The second device 120 may then determine whether the transmission power on at least one of its serving cells 130-1 and 130-2 is degraded due to the power reduction based on the value ΔP and a FR type of the serving cell 130.

For example, the second device 120 may compare the value ΔP with respective threshold values of power reduction associated with serving cells 130-1 and 130-2, and if the value ΔP exceeds the threshold value, a corresponding serving cell 130 may be determined to be affected by the power reduction, for example, the transmission power on the serving cell 130 is degraded. As another example, with the value ΔP, the second device 120 may directly determine that the transmission on the serving cell 130-1 is degraded while the transmission on the serving cell 130-2 is not affected by the power reduction, since serving cell 130-1 is of FR1 type and serving cell 130-2 is of FR 2 type.

In some embodiments, the second device 120 may receive power management report during a random access procedure or a scheduling request procedure with the first device 110. In a case of the 2-step random access procedure, the second device 120 may receive the power management report together with the random access preamble, i.e., a MSGA. In a case of the 4-step random access procedure, the second device 120 may receive the random access preamble in the MSG1 from the first device 110, and the random access preamble may include an indicator indicative of the power reduction of the first device 110. The second device 120 may transmit a message, for example, the MSG2 to the first device 110 for indicative of resources allocated for a transmission to be scheduled between the first device 110 and the second device 120. Then, the second device 120 may receive the power management report in the MSG3 on the allocated resources.

In some embodiments, the second device 120 may receive the power management report during a scheduling request procedure. The second device 120 may receive the scheduling request from the first device 110, and the scheduling request may include an indicator for indicating the power reduction of the first device 110. The second device 120 may transmit a response indicative of resources allocated for a transmission between the first device 110 and the second device 120.

In some embodiments, the resources allocated for the transmission between the first device 110 and the second device 120 are determined in consideration of the power reduction. For example, the second device 120 may select resources on serving cells on which the transmission power is not degraded due to the power reduction. The second device 120 may receive the power management report on the allocated resources.

In some embodiments, if the second device 120 determines a transmission power on the serving cell 130 is degraded due to the power reduction, the second device 120 may release or deactivate the serving cell 130. Alternatively, if the second device 120 determines a transmission power on the serving cell 130 is degraded due to the power reduction, the second device 120 may decrease data transmission to be scheduled on the serving cell 130.

In some embodiments, the second device 120 may transmit the power management report to another device serving the first device 110. For example, the second device 120-1 may transmit the power management report to the second device 120-2 to enable the second device 120-2 to control the transmission on the serving cells 130-3 and 130-4.

In some example embodiments, an apparatus capable of performing the method 400 (for example, the first device 110) may comprise means for performing the respective steps of the method 400. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. The apparatus may be implemented as or included in the first device 110. In some embodiments, the means may comprise at least one processor and at least one memory including computer program code. The at least one memory and computer program code are configured to, with the at least one processor, cause performance of the apparatus.

In some example embodiments, the apparatus comprises means for in accordance with a determination of a demand for reporting a power reduction to be applied on at least one of the serving cells of the first device, determining a reporting scheme based on at least one parameter related to the power reduction; and means for transmitting, to the second device, a power management report containing information about the power reduction based on the reporting scheme.

In some example embodiments, the apparatus further comprises means for determining a value of the power reduction; means for comparing the value with a first threshold value for triggering reporting of the power reduction; and means for in accordance with a determination that the value exceeds the first threshold value, determining that there is the demand for reporting the power reduction to be applied on the at least one of the serving cells.

In some example embodiments, the apparatus further comprises means for in accordance with a determination that at least one of the serving cells of the first device is managed by a third device different from the second device, transmitting the power management report to the third device.

In some example embodiments, the parameter indicates at least one of a value of the power reduction; a power reduction level associated with the at least one of the serving cells; a first beam selected, by the first device, for performing the random access procedure; a second beam selected, by the first device, for performing the scheduling request procedure; a number of scheduling requests being transmitted by the first device; and a dedicated resource available for reporting the power reduction.

In some example embodiments, the parameter indicates a value of the power reduction, and the means for determining the reporting scheme based on the at least one parameter comprises: means for comparing the value with a second threshold value for triggering a random access procedure, the second threshold value being higher than a first threshold for triggering reporting of the power reduction; means for in accordance with a determination that the value exceeds the second threshold value, determining the reporting scheme based on the random access procedure; and means for in accordance with a determination that the value does not exceed the second threshold value, determining the reporting scheme based on a scheduling request procedure.

In some example embodiments, the parameter indicates a power reduction level associated with the at least one of the serving cells of the first device, and the means for determining the reporting scheme based on the parameter comprises: means for determining that the power reduction is to be applied on all of the serving cells of the first device; means for comparing a power reduction level associated with a corresponding serving cell of the first device with a first threshold level; and means for in accordance with a determination that all of the serving cells of the first device are associated with a corresponding power reduction level exceeding the first threshold level, determining the reporting scheme based on a random access procedure.

In some example embodiments, the parameter indicates a first beam selected for performing a random access procedure, and the means for determining the reporting scheme based on the parameter comprises: means for determining a power reduction level of the first beam; and means for in accordance with a determining that the power reduction level does not exceed a first predetermined threshold level, determining the reporting scheme based on the random access procedure.

In some example embodiments, the at least one parameter indicates a value of the power reduction, and the means for determining the reporting scheme based on the at least one parameter comprises: means for comparing the value with a third threshold value for triggering a random access preamble for initiating a random access procedure, the third threshold value being higher than a first threshold value for triggering reporting of the power reduction; means for in accordance with a determination that the value exceeds the third threshold value, determining to transmit the random access preamble to the second device immediately after determining the demand for reporting the power reduction; and means for in accordance with a determination that the value does not exceed the third threshold value, determining to transmit the random access preamble to the second device upon data to be scheduled occurs at the first device.

In some example embodiments, the means for transmit the power management report comprises: means for transmitting the power management report during the random process procedure.

In some example embodiments, the random access procedure is a 4-step random access procedure, and the means for transmitting the power management report comprises: means for transmitting a random access preamble to the second device; means for receiving, from the second device, a message indicative of resources allocated for a transmission; and means for transmitting the power management report on the allocated resources to the second device.

In some example embodiments, the random access preamble indicates the power reduction of the first device and causes the second device to allocate resources on a serving cell of the first device on which a transmission power is not degraded due to the power reduction.

In some example embodiments, the random access procedure is a 2-step random access procedure, and the means for transmitting the power management report comprises: means for transmitting the power management report on a preconfigured resource.

In some example embodiments, the parameter indicates a power reduction level associated with the at least one of the serving cells of the first device, the at least one of the serving cells includes a first serving cell managed by the second device, and a scheduling request procedure between the first device and the second device is performed on the first serving cell, and the means for determining the reporting scheme based on the parameter comprises: means for in accordance with a determination that the power reduction level of the first serving cell does not exceed a second threshold level, determining the reporting scheme based on the scheduling request procedure.

In some example embodiments, the parameter indicates a second beam selected for performing a scheduling request procedure, and the means for determining the reporting scheme based on the parameter comprises: means for determining a power reduction level of the second beam; and means for in accordance with a determining that the power reduction level does not exceed a second predetermined threshold level, determining the reporting scheme based on the scheduling request procedure.

In some example embodiments, in accordance with a determination that the reporting scheme based on the scheduling request procedure, the means for transmitting the power management report comprises: means for transmitting a scheduling request for resource allocation to the second device; means for receiving, from the second device, a response indicative of resources allocated for a transmission; and means for transmitting the power management report on the allocated resources to the second device.

In some example embodiments, the scheduling request indicates the power reduction of the first device, and the means for receiving the response comprises: means for receiving, from the second device, the response indicative of the allocated resources on a serving cell of the first device on which a transmission power is not degraded due to the power reduction.

In some example embodiments, the at least one parameter indicates a value of the power reduction, and the means for determining the reporting scheme based on the at least one parameter comprises: means for comparing the value with a fourth threshold value for triggering a scheduling request for initiating a scheduling request procedure, the fourth threshold value being higher than a first threshold value for triggering reporting of the power reduction; means for in accordance with a determination that the value exceeds the fourth threshold value, determining to transmit the scheduling request for resource allocation to the second device immediately after determining the demand for reporting the power reduction; and means for in accordance with a determination that the value does not exceed the fourth threshold value, determining to transmit the scheduling request for resource allocation to the second device upon the data to be scheduled occurs at the first device.

In some example embodiments, the means for transmitting the power management report comprises: means for transmitting the power management report during the scheduling request procedure.

In some example embodiments, the parameter indicates the number of scheduling requests being transmitted by the first device, the scheduling request is configured for initiating a scheduling request procedure between the first device and the second device, and the means for determining the reporting scheme based on the parameter comprises: means for in accordance with a determination that the number of the scheduling requests being transmitted by the first device exceeds a maximum number for transmitting the scheduling request, determining the reporting scheme based on a random access procedure.

In some example embodiments, the parameter indicates a dedicated resource available for reporting the power reduction, and the dedicated resource is preconfigured by the second device, and the means for determining the reporting scheme based on the at least one parameter comprises: means for n accordance with a determination that a dedicated resource for a random access procedure is available for reporting the power reduction, determining the reporting scheme based on the random access procedure.

In some example embodiments, the parameter indicates a dedicated resource available for reporting the power reduction, and the dedicated resource is preconfigured by the second device, and the means for determining the reporting scheme based on the at least one parameter comprises: means for in accordance with a determination that a dedicated resource for a scheduling request procedure is available for reporting the power reduction, determining the reporting scheme based on the scheduling request procedure.

In some example embodiments, the means for transmitting the power management report containing information about the maximum power reduction comprises: means for transmitting the power management report containing a value of the power reduction.

In some example embodiments, the power reduction to be applied comprises a power management maximum power reduction of the first device, and the power management report comprises a power management maximum power reduction report, and the means for transmitting the power management report comprises: transmitting the power management maximum power reduction report via a dedicated MAC control element or together with a MAC control element for power headroom report.

In some example embodiments, the first device comprises a terminal device and the second device comprises a network device.

In some example embodiments, an apparatus capable of performing the method 700 (for example, the second device 120) may comprise means for performing the respective steps of the method 700. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. In some embodiments, the means may comprise at least one processor and at least one memory including computer program code. The at least one memory and computer program code are configured to, with the at least one processor, cause performance of the apparatus. The apparatus may be implemented as or included in the second device 120.

In some example embodiments, the apparatus comprises means for receiving a power management report from a first device, the power management report containing information about a power reduction to be applied on at least one of serving cells of the first device; and means for controlling a transmission on a second serving cell of the first device based on the information.

In some example embodiments, the at least one of the serving cells is managed by the second device or a third device, and means for controlling the transmission comprises: means for obtaining, from the information, a value of the power reduction; and means for in accordance with a determination of a transmission power on at least one of serving cells managed by the second device is degraded due to the power reduction based on the value of the power reduction and a type of the serving cell, controlling a transmission on the at least one of the serving cells.

In some example embodiments, the means for receiving the power management report comprises: means for receiving the power management report during a random access procedure or a scheduling request procedure with the first device.

In some example embodiments, the random access procedure comprises a 2-step random access procedure, and means for receiving the power management report comprises: means for receiving the power management report on a preconfigured resource.

In some example embodiments, the random access procedure comprises a 4-step random access procedure , and the apparatus further comprises: means for receiving a random access preamble from the first device; and means for transmitting, to the first device, a message indicative of resources allocated for a transmission to be scheduled between the first device and the second device. The means for receiving the power management report comprises: means for receiving the power management report on the allocated resources.

In some example embodiments, the random access preamble indicates the power reduction of the first device, and the means for transmitting the message indicative of resources allocated for the transmission comprises: means for transmitting the message indicative of resources on a serving cell managed by the second device on which a transmission power is not degraded due to the power reduction.

In some example embodiments, the power management report is received during the scheduling request procedure, and the apparatus further comprises: means for receiving a scheduling request from the first device; means for transmitting, to the first device, a response indicative of resources allocated for a transmission to be scheduled between the first device and the second device. The means for receiving the power management report comprises: means for receiving the power management report on the allocated resources.

In some example embodiments, the scheduling request indicates the power reduction of the first device, and the means for transmitting the response indicative of resources allocated for the transmission comprises: means for transmitting the message indicative of resources on a serving cell managed by the second device on which a transmission power is not degraded due to the power reduction.

In some example embodiments, the means for receiving the power management report comprises: means for receiving the power management report via a dedicated MAC control element or together with a MAC control element for power headroom report.

In some example embodiments, the means for controlling the transmission comprises: means for releasing the second serving cell; and means for deactivating the second serving cell.

In some example, the apparatus further comprises means for transmitting the power management report to a third device managed at least one serving cell of the first device.

In some example embodiments, the third device comprises a network device.

FIG. 8 is a simplified block diagram of a device 800 that is suitable for implementing embodiments of the present disclosure. The device 800 may be provided to implement the communication device, for example the first device 110 and the second device 120 as shown in FIG. 1. As shown, the device 800 includes one or more processors 810, one or more memories 840 coupled to the processor 810, and one or more transmitters and/or receivers (TX/RX) 840 coupled to the processor 810.

The TX/RX 840 is for bidirectional communications. The TX/RX 840 has at least one antenna to facilitate communication. The communication interface may represent any interface that is necessary for communication with other network elements.

The processor 810 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples. The device 800 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.

The memory 820 may include one or more non-volatile memories and one or more volatile memories. Examples of the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 824, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , and other magnetic storage and/or optical storage. Examples of the volatile memories include, but are not limited to, a random access memory (RAM) 822 and other volatile memories that will not last in the power-down duration.

A computer program 830 includes computer executable instructions that are executed by the associated processor 810. The program 830 may be stored in the ROM 820. The processor 810 may perform any suitable actions and processing by loading the program 830 into the RAM 820.

The embodiments of the present disclosure may be implemented by means of the program 830 so that the device 800 may perform any process of the disclosure as discussed with reference to FIGs. 3-7. The embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.

In some embodiments, the program 830 may be tangibly contained in a computer readable medium which may be included in the device 800 (such as in the memory 820) or other storage devices that are accessible by the device 800. The device 800 may load the program 830 from the computer readable medium to the RAM 822 for execution. The computer readable medium may include any types of tangible non-volatile storage, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like. FIG. 9 shows an example of the computer readable medium 900 in form of CD or DVD. The computer readable medium has the program 830 stored thereon.

Generally, various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, device, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.

The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium. The computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the

methods

400 and 700 as described above with reference to FIGs. 4 and 7. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various embodiments. Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.

Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing device, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented. The program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.

In the context of the present disclosure, the computer program codes or related data may be carried by any suitable carrier to enable the device, device or processor to perform various processes and operations as described above. Examples of the carrier include a signal, computer readable medium, and the like.

The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are contained in the above discussions, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to particular embodiments. Certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable sub-combination.

Although the present disclosure has been described in languages specific to structural features and/or methodological acts, it is to be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

A first device comprising:

at least one processor; and

at least one memory including computer program codes;

the at least one memory and the computer program codes are configured to, with the at least one processor, cause the first device at least to:

in accordance with a determination of a demand for reporting a power reduction to be applied on at least one of serving cells of a first device, determine a reporting scheme for the at least one of the serving cells based on at least one parameter related to the power reduction;

transmit, to the second device, a power management report containing information about the power reduction based on the reporting scheme.
The first device of Claim 1, wherein the first device is further caused to:

determine a value of the power reduction;

compare the value with a first threshold value for triggering reporting of the power reduction; and

in accordance with a determination that the value exceeds the first threshold value, determine that there is the demand for reporting the power reduction to be applied on the at least one of the serving cells.
The first device of Claim 1, wherein the first device is further caused to:

in accordance with a determination that at least one of the serving cells of the first device is managed by a third device different from the second device, transmit the power management report to the third device.
The first device of Claim 1, wherein the at least one parameter indicates at least one of the following:

a value of the power reduction;

a power reduction level associated with the at least one of the serving cells of the first device;

a first beam selected, by the first device, for performing a random access procedure;

a second beam selected, by the first device, for performing a scheduling request procedure;

a number of scheduling requests being transmitted by the first device, the scheduling requests being configured for initiating the scheduling request procedure ; and

a dedicated resource available for reporting the power reduction.
The first device of Claim 1, wherein the at least one parameter indicates a value of the power reduction, and

wherein the first device is caused to determine the reporting scheme based on the at least one parameter by:

comparing the value with a second threshold value for triggering a random access procedure, the second threshold value being higher than a first threshold for triggering reporting of the power reduction;

in accordance with a determination that the value exceeds the second threshold value, determining the reporting scheme based on the random access procedure; and

in accordance with a determination that the value does not exceed the second threshold value, determining the reporting scheme based on a scheduling request procedure.
The first device of Claim 1, wherein the at least one parameter indicates a power reduction level associated with the at least one of the serving cells of the first device, and

wherein the first device is caused to determine the reporting scheme based on the at least one parameter by:

determining that the power reduction is to be applied on all of the serving cells of the first device;

comparing a power reduction level associated with a corresponding serving cell of the first device with a first threshold level; and

in accordance with a determination that all of the serving cells of the first device are associated with a corresponding power reduction level exceeding the first threshold level, determining the reporting scheme based on a random access procedure.
The first device of Claim 1, wherein the at least one parameter indicates a first beam selected for performing a random access procedure, and

wherein the first device is caused to determine the reporting scheme based on the at least one parameter by:

determining a power reduction level of the first beam; and

in accordance with a determining that the power reduction level does not exceed a first predetermined threshold level, determining the reporting scheme based on the random access procedure.
The first device of Claim 1, wherein the at least one parameter indicates a value of the power reduction, and

wherein the first device is caused to determine the reporting scheme based on the at least one parameter by:

comparing the value with a third threshold value for triggering a random access preamble for initiating a random access procedure, the third threshold value being higher than a first threshold value for triggering reporting of the power reduction;

in accordance with a determination that the value exceeds the third threshold value, determining to transmit the random access preamble to the second device immediately after determining the demand for reporting the power reduction; and

in accordance with a determination that the value does not exceed the third threshold value, determining to transmit the random access preamble to the second device upon data to be scheduled occurs at the first device.
The first device of Claim 8, wherein the first device is caused to transmit the power management report by:

transmitting the power management report during the random process procedure.
The first device of any of Claims 5 to 9, wherein the random access procedure is a 4-step random access procedure, and

wherein the first device is caused to transmit the power management report by:

transmitting a random access preamble to the second device;

receiving, from the second device, a message indicative of resources allocated for a transmission; and

transmitting the power management report on the allocated resources to the second device.
The first device of Claim 10, wherein the random access preamble indicates the power reduction of the first device and causes the second device to allocate resources on a serving cell of the first device on which a transmission power is not degraded due to the power reduction.
The first device of any of Claims 5 to 8, wherein the random access procedure is a 2-step random access procedure, and

wherein the first device is caused to transmit the power management report by:

transmitting the power management report on a preconfigured resource.
The first device of Claim 1, wherein the at least one parameter indicates a power reduction level associated with the at least one of the serving cells of the first device, the at least one of the serving cells includes a first serving cell managed by the second device, and a scheduling request procedure between the first device and the second device is performed on the first serving cell, and

wherein the first device is caused to determine the reporting scheme based on the at least one parameter by:

in accordance with a determination that the power reduction level of the first serving cell does not exceed a second threshold level, determining the reporting scheme based on the scheduling request procedure.
The first device of Claim 1, wherein the at least one parameter indicates a second beam selected for performing a scheduling request procedure, and

wherein the first device is caused to determine the reporting scheme based on the at least one parameter by:

determining a power reduction level of the second beam; and

in accordance with a determining that the power reduction level does not exceed a second predetermined threshold level, determining the reporting scheme based on the scheduling request procedure.
The first device of Claim 13 or 14, wherein in accordance with a determination that the reporting scheme based on the scheduling request procedure, the first device is caused to transmit the power management report by:

transmitting a scheduling request for resource allocation to the second device;

receiving, from the second device, a response indicative of resources allocated for a transmission; and

transmitting the power management report on the allocated resources to the second device.
The first device of Claim 15, wherein the scheduling request indicates the power reduction of the first device, and

wherein the first device is caused to receive the response by:

receiving, from the second device, the response indicative of the allocated resources on a serving cell of the first device on which a transmission power is not degraded due to the power reduction.
The first device of Claim 1, wherein the at least one parameter indicates a value of the power reduction, and

wherein the first device is caused to determine the reporting scheme based on the at least one parameter by:

comparing the value with a fourth threshold value for triggering a scheduling request for initiating a scheduling request procedure, the fourth threshold value being higher than a first threshold value for triggering reporting of the power reduction;

in accordance with a determination that the value exceeds the fourth threshold value, determining to transmit the scheduling request for resource allocation to the second device immediately after determining the demand for reporting the power reduction; and

in accordance with a determination that the value does not exceed the fourth threshold value, determining to transmit the scheduling request for resource allocation to the second device upon the data to be scheduled occurs at the first device.
The first device of Claim 17, wherein the first device is caused to transmit the power management report by:

transmitting the power management report during the scheduling request procedure.
The first device of Claim 1, wherein the at least one parameter indicates a number of scheduling requests being transmitted by the first device, the scheduling request is configured for initiating a scheduling request procedure between the first device and the second device, and

wherein the first device is caused to determine the reporting scheme based on the at least one parameter by:

in accordance with a determination that the number of the scheduling requests being transmitted by the first device exceeds a maximum number for transmitting the scheduling request, determining the reporting scheme based on a random access procedure.
The first device of Claim 1, wherein the at least one parameter indicates a dedicated resource available for reporting the power reduction, and the dedicated resource is preconfigured by the second device, and

wherein the first device is caused to determine the reporting scheme based on the at least one parameter by:

in accordance with a determination that a dedicated resource for a random access procedure is available for reporting the power reduction, determining the reporting scheme based on the random access procedure.
The first device of Claim 1, wherein the at least one parameter indicates a dedicated resource available for reporting the power reduction, and the dedicated resource is preconfigured by the second device, and

wherein the first device is caused to determine the reporting scheme based on the at least one parameter by:

in accordance with a determination that a dedicated resource for a scheduling request procedure is available for reporting the power reduction, determining the reporting scheme based on the scheduling request procedure.
The first device of Claim 1, wherein the first device is caused to transmit the power management report containing information about the power reduction by:

transmitting the power management report containing a value of the power reduction.
The first device of Claim 1, wherein the power reduction to be applied comprises a power management maximum power reduction of the first device, and the power management report comprises a power management maximum power reduction report, and

wherein the first device is caused to transmit the power management report by:

transmitting the power management maximum power reduction report via a dedicated MAC control element or together with a MAC control element for power headroom report.
The first device of any of Claims 1-23, wherein the first device comprises a terminal device and the second device comprises a network device.
A second device comprising:

at least one processor; and

at least one memory including computer program codes;

the at least one memory and the computer program codes are configured to, with the at least one processor, cause the second device at least to:

receive a power management report from a first device, the power management report containing information about a power reduction to be applied on at least one of serving cells of the first device; and

control a transmission on a second serving cell of the first device based on the information.
The second device of Claim 25, wherein the at least one of the serving cells is managed by the second device or a third device, and

wherein the second device is caused to control the transmission by:

obtaining, from the information, a value of the power reduction; and

in accordance with a determination of a transmission power on at least one of serving cells managed by the second device is degraded due to the power reduction based on the value of the power reduction and a type of the serving cell, controlling a transmission on the at least one of the serving cells.
The second device of Claim 25, wherein the second device is caused to receive the power management report by:

receiving the power management report during a random access procedure or a scheduling request procedure with the first device.
The second device of Claim 27, wherein the random access procedure comprises a 2-step random access procedure, and

wherein the second device is caused to receive the power management report by:

receiving the power management report on a preconfigured resource.
The second device of Claim 27, wherein the random access procedure comprises a 4-step random access procedure, and

wherein the second device is further caused to:

receive a random access preamble from the first device; and

transmit, to the first device, a message indicative of resources allocated for a transmission to be scheduled between the first device and the second device, and

wherein the second device is caused to receive the power management report by:

receiving the power management report on the allocated resources.
The second device of Claim 29, wherein the random access preamble indicates the power reduction of the first device, and

wherein the second device is caused to transmit the message indicative of resources allocated for the transmission by:

transmitting the message indicative of resources on a serving cell managed by the second device on which a transmission power is not degraded due to the power reduction.
The second device of Claim 27, wherein the power management report is received during the scheduling request procedure, and

wherein the second device is further caused to:

receive a scheduling request from the first device; and

transmit, to the first device, a response indicative of resources allocated for a transmission between the first device and the second device, and

wherein the second device is caused to receive the power management report by:

receiving the power management report on the allocated resources.
The second device of Claim 31, wherein the scheduling request indicates the power reduction of the first device, and

wherein the second device is caused to transmit the response indicative of resources allocated for the transmission by:

transmitting the message indicative of resources on a serving cell managed by the second device on which a transmission power is not degraded due to the power reduction.
The second device of Claim 25, wherein the second device is caused to receive the power management report by:

receiving the power management report via a dedicated MAC control element or together with a MAC control element for power headroom report.
The second device of Claim 25, wherein the second device is caused to control the transmission by:

in accordance with a determination that a transmission power on the second serving cell is degraded due to the power reduction, performing at least one of the following:

releasing the second serving cell; and

deactivating the second serving cell.
The second device of Claim 25, wherein the second device is further caused to:

transmit the power management report to a third device managed at least one serving cell of the first device.
The second device of any of Claims 25 to 35, wherein the first device comprises a terminal device and the second device comprises a network device.
The second device of Claim 26 or 36, wherein the third device comprises a network device.
A method comprising:

in accordance with a determination of a demand for reporting a power reduction to be applied on at least one of serving cells of a first device, determining, at the first device, a reporting scheme for the at least one of the serving cells based on at least one parameter related to the power reduction; and

transmitting, to the second device, a power management report containing information about the power reduction based on the reporting scheme.
The method of Claim 38, further comprising:

determining a value of the power reduction;

comparing the value with a first threshold value for triggering reporting of the power reduction; and

in accordance with a determination that the value exceeds the first threshold value, determining that there is the demand for reporting the power reduction to be applied on the at least one of the serving cells.
The method of Claim 38, further comprising:

in accordance with a determination that at least one of the serving cells of the first device is managed by a third device different from the second device, transmitting the power management report to the third device.
The method of Claim 38, wherein the at least one parameter indicates at least one of the following:

a value of the power reduction;

a power reduction level associated with the at least one of the serving cells of the first device;

a first beam selected, by the first device, for performing the random access procedure;

a second beam selected, by the first device, for performing the scheduling request procedure;

a number of scheduling requests being transmitted by the first device; and

a dedicated resource available for reporting the power reduction.
The method of Claim 38, wherein the at least one parameter indicates a value of the power reduction, and

wherein determining the reporting scheme based on the at least one parameter comprises:

comparing the value with a second threshold value for triggering a random access procedure, the second threshold value being higher than a first threshold for triggering reporting of the power reduction;

in accordance with a determination that the value exceeds the second threshold value, determining the reporting scheme based on the random access procedure; and

in accordance with a determination that the value does not exceed the second threshold value, determining the reporting scheme based on the scheduling request procedure.
The method of Claim 38, wherein the at least one parameter indicates a power reduction level associated with the at least one of the serving cells of the first device, and

wherein determining the reporting scheme based on the at least one parameter comprises:

determining that the power reduction is to be applied on all of the serving cells of the first device;

comparing a power reduction level associated with a corresponding serving cell of the first device with a first threshold level; and

in accordance with a determination that all of the serving cells of the first device are associated with a corresponding power reduction level exceeding the first threshold level, determining the reporting scheme based on the random access procedure.
The method of Claim 38, wherein the at least one parameter indicates a first beam selected for performing a random access procedure, and

wherein determining the reporting scheme based on the at least one parameter comprises:

determining a power reduction level of the first beam; and

in accordance with a determining that the power reduction level does not exceed a first predetermined threshold level, determining the reporting scheme based on the random access procedure.
The method of Claim 38, wherein the at least one parameter indicates a value of the power reduction, and

wherein determining the reporting scheme based on the at least one parameter comprises:

comparing the value with a third threshold value for triggering a random access preamble for initiating a random access procedure, the third threshold value being higher than a first threshold value for triggering reporting of the power reduction;

in accordance with a determination that the value exceeds the third threshold value, determining to transmit the random access preamble to the second device immediately after determining the demand for reporting the power reduction; and

in accordance with a determination that the value does not exceed the third threshold value, determining to transmit the random access preamble to the second device upon data to be scheduled occurs at the first device.
The method of Claim 45, wherein transmitting the power management report comprises:

transmitting the power management report during the random process procedure.
The method of any of Claims 42-46, wherein the random access procedure is a 4-step random access procedure, and

wherein transmitting the power management report comprises:

transmitting a random access preamble to the second device, ;

receiving, from the second device, a message indicative of resources allocated for a transmission; and

transmitting the power management report on the allocated resources to the second device.
The method of Claim 47, wherein the random access preamble indicates the power reduction of the first device and causes the second device to allocate resources on a serving cell of the first device on which a transmission power is not degraded due to the power reduction.
The method of any of Claims 42 to 45, wherein the random access procedure is a 2-step random access procedure, and

wherein transmitting the power management report comprises:

transmitting the power management report on a preconfigured resource.
The method of Claim 38, wherein the at least one parameter indicates a power reduction level associated with the at least one of the serving cells of the first device, the at least one of the serving cells includes a first serving cell managed by the second device, and a scheduling request procedure between the first device and the second device is performed on the first serving cell, and

wherein determining the reporting scheme based on the at least one parameter comprises:

in accordance with a determination that the power reduction level of the first serving cell does not exceed a second threshold level, determining the reporting scheme based on the scheduling request procedure.
The method of Claim 38, wherein the at least one parameter indicates a second beam selected for performing a scheduling request procedure, and

wherein determining the reporting scheme based on the at least one parameter comprises:

determining a power reduction level of the second beam; and

in accordance with a determining that the power reduction level does not exceed a second predetermined threshold level, determining the reporting scheme based on the scheduling request procedure.
The method of Claim 50 or 51, wherein in accordance with a determination that the reporting scheme based on the scheduling request procedure, transmitting the power management report comprises:

transmitting a scheduling request for resource allocation to the second device;

receiving, from the second device, a response indicative of resources allocated for a transmission; and

transmitting the power management report on the allocated resources to the second device.
The method of Claim 52, wherein the scheduling request indicates the power reduction of the first device, and

wherein receiving the response comprises:

receiving, from the second device, the response indicative of the allocated resources on a serving cell of the first device on which a transmission power is not degraded due to the power reduction.
The method of Claim 38, wherein the at least one parameter indicates a value of the power reduction, and

wherein determining the reporting scheme based on the at least one parameter comprises:

comparing the value with a fourth threshold value for triggering a scheduling request for initiating a scheduling request procedure, the fourth threshold value being higher than a first threshold value for triggering reporting of the power reduction;

in accordance with a determination that the value exceeds the fourth threshold value, determining to transmit the scheduling request for resource allocation to the second device immediately after determining the demand for reporting the power reduction; and

in accordance with a determination that the value does not exceed the fourth threshold value, determining to transmit the scheduling request for resource allocation to the second device upon the data to be scheduled occurs at the first device.
The first device of Claim 54, wherein transmitting the power management report comprises:

transmitting the power management report during the scheduling request procedure.
The method of Claim 38, wherein the at least one parameter indicates a number of scheduling requests being transmitted by the first device, the scheduling request is configured for initiating a scheduling request procedure between the first device and the second device, and

wherein determining the reporting scheme based on the at least one parameter comprises:

in accordance with a determination that the number of the scheduling requests being transmitted by the first device exceeds a maximum number for transmitting the scheduling request, determining the reporting scheme based on a random access procedure.
The method of Claim 38, wherein the at least one parameter indicates a dedicated resource available for reporting the power reduction, and the dedicated resource is preconfigured by the second device,

wherein determining the reporting scheme based on the at least one parameter comprises:

in accordance with a determination that a dedicated resource for a random access procedure is available for reporting the power reduction, determining the reporting scheme based on the random access procedure.
The method of Claim 38, wherein the at least one parameter indicates a dedicated resource available for reporting the power reduction, and the dedicated resource is preconfigured by the second device, and

wherein determining the reporting scheme based on the at least one parameter comprises:

in accordance with a determination that a dedicated resource for a scheduling request procedure is available for reporting the power reduction, determining the reporting scheme based on the scheduling request procedure.
The method of Claim 38, wherein transmitting the power management report containing information about the power reduction comprises:

transmitting the power management report containing a value of the power reduction.
The method of Claim 38, wherein the power reduction to be applied comprises a power management maximum power reduction of the first device, and the power management report comprises a power management maximum power reduction report, and transmitting the power management report comprises:

transmitting the power management maximum power reduction report via a dedicated MAC control element or together with a MAC control element for power headroom report.
The method of any of Claims 38-60, wherein the first device comprises a terminal device and the second device comprises a network device.
A method comprising:

receiving, at a second device, a power management report from a first device, the power management report containing information about a power reduction to be applied on at least one of serving cells of the first device; and

controlling a transmission on a second serving cell of the first device based on the information.
The method of Claim 62, wherein the at least one of the serving cells is managed by the second device or a third device, and

wherein controlling the transmission comprises:

obtaining, from the information, a value of the power reduction; and

in accordance with a determination of a transmission power on at least one of serving cells managed by the second device is degraded due to the power reduction based on the value of the power reduction and a type of the serving cell, controlling a transmission on the at least one of the serving cells.
The method of Claim 62, wherein receiving the power management report comprises:

receiving the power management report during a random access procedure or a scheduling request procedure with the first device.
The method of Claim 64, wherein the random access procedure comprises a 2-step random access procedure, and

wherein receiving the power management report comprises:

receiving the power management report on a preconfigured resource.
The method of Claim 64, wherein the random access procedure comprises a 4-step random access procedure, and wherein the method further comprises:

receiving a random access preamble from the first device; and

transmitting, to the first device, a message indicative of resources allocated for a transmission to be scheduled between the first device and the second device, and

wherein receiving the power management report comprises:

receiving the power management report on the allocated resources.
The method of Claim 66, wherein the random access preamble indicates the power reduction of the first device, and

wherein transmitting the message indicative of resources allocated for the transmission comprises:

transmitting the message indicative of resources on a serving cell managed by the second device on which a transmission power is not degraded due to the power reduction.
The method of Claim 64, wherein the power management report is received during the scheduling request procedure, and

wherein the method further comprises:

receiving a scheduling request from the first device; and

transmitting, to the first device, a response indicative of resources allocated for a transmission to be scheduled between the first device and the second device, and

wherein receiving the power management report comprises:

receiving the power management report on the allocated resources.
The method of Claim 68, wherein the scheduling request indicates the power reduction of the first device, and

wherein transmitting the response indicative of resources allocated for the transmission comprises:

transmitting the message indicative of resources on a serving cell managed by the second device on which a transmission power is not degraded due to the power reduction.
The method of Claim 62, wherein receiving the power management report comprises:

receiving the power management report via a dedicated MAC control element or together with a MAC control element for power headroom report.
The method of Claim 62, wherein controlling the transmission comprises:

in accordance with a determination that a transmission power on the second serving cell is degraded due to the power reduction, performing at least one of the following:

releasing the second serving cell; and

deactivating the second serving cell.
The method of Claim 62, further comprising:

transmitting the power management report to a third device managed at least one serving cell of the first device.
The method of any of Claims 62 to 72, wherein the first device comprises a terminal device and the second device comprises a network device.
The method of Claim 63 or 73, wherein the third device comprises a network device.
An apparatus comprising:

means for in accordance with a determination of a demand for reporting a power reduction to be applied on at least one of serving cells of a first device, determining a reporting scheme for the at least one of the serving cells based on at least one parameter related to the power reduction; and

means for transmitting to the second device, a power management report containing information about the power reduction based on the reporting scheme.
An apparatus comprising:

means for receiving a power management report from a first device, the power management report containing information about a power reduction to be applied on at least one of serving cells of the first device; and

means for controlling a transmission on a second serving cell of the first device based on the information.
A non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method of any of claims 38-61.
A non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method of any of claims 62-74.