CN114175766A

CN114175766A - Method, apparatus and system for reporting power headroom for uplink transmission

Info

Publication number: CN114175766A
Application number: CN201980099002.1A
Authority: CN
Inventors: 张晨晨; 郝鹏; 魏兴光; 李儒岳; 姚珂
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2019-08-07
Filing date: 2019-08-07
Publication date: 2022-03-11
Anticipated expiration: 2039-08-07
Also published as: WO2021022513A1; CN114175766B

Abstract

Methods, apparatuses, and systems for reporting power headroom for uplink transmissions are disclosed. In one embodiment, a method performed by a wireless communication device is disclosed. The method comprises the following steps: determining a plurality of uplink transmissions in a plurality of corresponding cells supported by the wireless communication device, respectively; determining at least one Power Headroom Report (PHR) for a plurality of uplink transmissions from a wireless communication device to a wireless communication node; generating a Power Headroom Report (PHR) Medium Access Control (MAC) Control Element (CE) for reporting at least one PHR; and determining an uplink transmission for carrying the PHR from the plurality of uplink transmissions.

Description

Method, apparatus and system for reporting power headroom for uplink transmission

Cross Reference to Related Applications

This application relates to PCT international application entitled "method, apparatus and system for determining power headroom for uplink transmission" filed on 7.8.2019 by attorney docket No. ZTE-2019-001363-WO/G6418-59900, which is expressly incorporated herein in its entirety by reference.

Technical Field

The present disclosure relates generally to wireless communications, and more particularly, to methods, apparatuses, and systems for reporting power headroom for uplink transmissions in wireless communications.

Background

In a wireless network, in order for a Base Station (BS) to know uplink Power usage of a terminal more accurately, a Power Headroom Report (PHR) mechanism is supported. That is, according to the configuration of the base station, when a specific trigger condition is satisfied, the terminal will report the Power Headroom (PH) or report the PH and the maximum transmission power (Pcmax) at the same time.

In a fifth generation (5G) New Radio (NR) system or a later evolution system, multiple application types may be supported. The requirements of the PHR mechanism may be different for different application scenarios. For example, an ultra-reliable low-latency communication (URLLC) scenario may require a more accurate, more timely PHR trigger mechanism because of its higher reliability requirements. Enhanced mobile broadband (eMBB) scenarios do not require very high reliability and may not require a PHR trigger mechanism that is too frequent. Different application scenarios may have different ranges of power control parameters, and thus the PHR calculation may be different for different application types. Furthermore, the power control parameter configuration may also be different for the Physical Uplink Shared Channel (PUSCH) scheduled by the grant and the configured grant PUSCH, and thus their PHR calculation is also different. The existing method for reporting PHR does not consider the situation that the same terminal supports different application scenarios, which may correspond to different power control parameter configurations.

Thus, existing systems and methods for reporting power headroom for uplink transmissions in wireless communications are not entirely satisfactory.

Disclosure of Invention

The exemplary embodiments disclosed herein are intended to solve problems associated with one or more problems presented in the prior art and to provide additional features that will become apparent by reference to the following detailed description when taken in conjunction with the accompanying drawings. In accordance with various embodiments, exemplary systems, methods, devices, and computer program products are disclosed herein. It is to be understood, however, that these embodiments are presented by way of example, and not limitation, and that various modifications to the disclosed embodiments may be apparent to those of ordinary skill in the art upon reading this disclosure, while remaining within the scope of the present disclosure.

In one embodiment, a method performed by a wireless communication device is disclosed. The method comprises the following steps: determining a plurality of uplink transmissions in a plurality of corresponding cells supported by the wireless communication device, respectively; determining at least one Power Headroom Report (PHR) for a plurality of uplink transmissions from a wireless communication device to a wireless communication node; generating a Power Headroom Report (PHR) Medium Access Control (MAC) Control Element (CE) for reporting the at least one PHR; and determining an uplink transmission for carrying the PHR from the plurality of uplink transmissions.

In another embodiment, a method performed by a wireless communication node is disclosed. The method comprises the following steps: scheduling a plurality of uplink transmissions in a plurality of corresponding cells supported by the wireless communication device, respectively; and receiving, from the wireless communication device, an uplink transmission determined from a plurality of uplink transmissions, the uplink transmission for carrying a Power Headroom Report (PHR) Medium Access Control (MAC) Control Element (CE), the rate headroom report (PHR) Medium Access Control (MAC) Control Element (CE) comprising a report of at least one Power Headroom (PH). At least one PHR is determined for a plurality of uplink transmissions from the wireless communication device to the wireless communication node. In the present disclosure, the terms "PH" and "PHR" may be used interchangeably.

In another embodiment, a wireless communication node configured to perform the method disclosed in an embodiment is disclosed. In yet another embodiment, a wireless communication device configured to perform the method disclosed in certain embodiment is disclosed. In another embodiment, a non-transitory computer-readable medium having stored thereon computer-executable instructions for performing the method disclosed in an embodiment is disclosed. The above aspects and other aspects and embodiments thereof are described in more detail in the accompanying drawings, the description and the claims.

Drawings

Various exemplary embodiments of the present disclosure are described in detail below with reference to the following drawings. The drawings are provided for purposes of illustration only and merely depict exemplary embodiments of the disclosure to facilitate the reader's understanding of the disclosure. Accordingly, the drawings are not to be considered limiting of the breadth, scope, or applicability of the present disclosure. It should be noted that for clarity and ease of illustration, the drawings are not necessarily drawn to scale.

Fig. 1 illustrates an example communication network in which techniques disclosed herein may be implemented, in accordance with an embodiment of the present disclosure.

Fig. 2 illustrates a block diagram of a Base Station (BS) in accordance with some embodiments of the present disclosure.

Fig. 3 illustrates a flow diagram of a method performed by a BS for uplink data transmission, in accordance with some embodiments of the present disclosure.

Fig. 4 illustrates a block diagram of a User Equipment (UE) in accordance with some embodiments of the present disclosure.

Fig. 5 illustrates a flow diagram of a method performed by a UE for reporting a Power Headroom Report (PHR), in accordance with some embodiments of the present disclosure.

Fig. 6 illustrates an example method for determining an uplink transmission for carrying a power headroom report according to some embodiments of the present disclosure.

Fig. 7 illustrates another example method for determining an uplink transmission for carrying a Power Headroom Report (PHR) in accordance with some embodiments of the present disclosure.

Fig. 8 illustrates an example method for determining whether a PHR is an actual PHR or a virtual PHR, according to some embodiments of the present disclosure.

FIG. 9 illustrates an exemplary method for determining whether a PHR is an actual PHR or a virtual PHR based on a look-ahead mechanism, according to some embodiments of the present disclosure.

FIG. 10 illustrates another exemplary method for determining whether a PHR is an actual PHR or a virtual PHR based on a look-ahead mechanism, according to some embodiments of the present disclosure.

Detailed Description

Various exemplary embodiments of the disclosure are described below with reference to the drawings to enable one of ordinary skill in the art to make and use the disclosure. As will be apparent to those of ordinary skill in the art upon reading this disclosure, various changes or modifications can be made to the examples described herein without departing from the scope of the present disclosure. Accordingly, the present disclosure is not limited to the exemplary embodiments and applications described and illustrated herein. Moreover, the particular order and/or hierarchy of steps in the methods disclosed herein is merely exemplary. Based upon design preferences, the specific order or hierarchy of steps in the methods or processes disclosed may be rearranged while remaining within the scope of the present disclosure. Accordingly, one of ordinary skill in the art will appreciate that the methods and techniques disclosed herein present the various steps or acts in a sample order, and unless otherwise explicitly stated, the disclosure is not limited to the specific order or hierarchy presented.

A typical wireless communication network includes one or more base stations (often referred to as "BSs"), each of which provides geographic wireless coverage, and one or more wireless user equipment terminals (often referred to as "UEs") that can transmit and receive data within the wireless coverage. According to the configuration of the BS, the UE may transmit a Power Headroom Report (PHR) Medium Access Control (MAC) Control Element (CE) to the BS. There are three types of PHR: type 1PHR, type 2PHR and type 3 PHR. The type-1 PHR and the type-2 PHR are calculated based on a Physical Uplink Shared Channel (PUSCH) and/or a Physical Uplink Control Channel (PUCCH), respectively, without considering a Sounding Reference Signal (SRS). The type 3PHR is calculated based on a Sounding Reference Signal (SRS), and may be applied to a subframe without PUSCH/PUCCH transmission. Each of the three types of PHR is performed at a cell level. The UE will calculate the PHR on each cell independently. For a UE supporting multiple cells, once a PHR is triggered in a certain cell, the UE reports the PHR on all or multiple activated cells to the base station. For the activated cell, either type 1PHR or type 3PHR will be transmitted. For cells that can transmit PUCCH, it will also feed back type 2 PHR. For any type of PHR, if the UE actually transmits a corresponding uplink channel or signal, the UE calculates the PHR from real-time information of the actual uplink transmission, such as power control parameters and occupied resources of the uplink channel or signal, and such calculated PHR is referred to as an actual PHR. If the UE does not transmit a corresponding uplink channel or signal, the UE calculates a PHR according to a predefined or preconfigured power control parameter referring to an uplink transport format, and such calculated PHR is referred to as a virtual PHR.

The 5G NR system supports two types of PHR: type 1PHR and type 3 PHR. The PHR may be real or virtual depending on whether it is calculated based on actual transmission. The UE or the terminal may feed back the PHR to the base station in a PHR Media Access Control (MAC) Control Element (CE). And if the terminal does not support a plurality of cells, the terminal feeds back the PHR of a Single cell in a Single Entry PHR MAC CE. If the terminal supports a plurality of cells, the terminal feeds back the PHR to the base station in a Multiple Entry PHR MAC CE.

Different PHR may be calculated for different application scenarios of the terminal. For a PHR fed back to a base station by a terminal, the present teachings disclose a method for the base station to know to which application scenario or application type the PHR corresponds. By using the methods disclosed in the present teachings, the terminal can determine which uplink transmission is used to carry PHR feedback; the terminal may determine whether PHR feedback of a certain cell is an actual PHR or a virtual PHR; both the terminal and the base station may determine which type of uplink transmission the PHR fed back by the terminal is calculated based on; the terminal can feed back the actual PHR more frequently, so that the base station can obtain more accurate power headroom information; the terminal can reduce PHR feedback overhead and save uplink resources.

The methods disclosed in the present teachings may be implemented in a wireless communication network in which a BS and a UE may communicate with each other via a communication link (e.g., via downlink radio frames from the BS to the UE or by uplink radio frames from the UE to the BS). In various embodiments, a BS in the present disclosure may be referred to as a network side and may include or be implemented as a next generation node b (gnb), an E-UTRAN node b (enb), a transmission/reception point (TRP), an Access Point (AP), and the like; and a UE in the present disclosure may be referred to as a terminal and may include or be implemented as a Mobile Station (MS), a Station (STA), and the like. The BS and the UE may be described herein as non-limiting examples of "wireless communication nodes" and "wireless communication devices," respectively, which may be capable of the methods disclosed herein and may be capable of wireless and/or wired communication in accordance with various embodiments of the present disclosure.

Fig. 1 illustrates an exemplary communication network 100 in which the techniques disclosed herein may be implemented, according to an embodiment of the disclosure. As shown in fig. 1, an exemplary communication network 100 includes a Base Station (BS)101 and a plurality of UEs (UE 1110, UE 2120 …, UE 3130), wherein the BS 101 may communicate with the UEs according to a wireless protocol. Each UE may transmit uplink data to the BS 101 using a transmission power set between 0 and the maximum transmission power. For uplink transmission, the UE may determine a Power Headroom Report (PHR) representing a remaining power headroom at the UE and report the PH to the BS.

Fig. 2 illustrates a block diagram of a Base Station (BS)200 in accordance with some embodiments of the present disclosure. BS 200 is an example of a device that may be configured to implement the various methods described herein. As shown in fig. 2, the BS 200 includes a housing 240, the housing 240 containing a system clock 202, a processor 204, a memory 206, a transceiver 210 including a transmitter 212 and a receiver 214, a power supply module 208, an uplink transmission scheduler 220, a PHR analyzer 222, a PHR carrier analyzer 224, and a power control parameter configurator 226.

In the present embodiment, system clock 202 provides timing signals to processor 204 for controlling the timing of all operations of BS 200. Processor 204 controls the general operation of BS 200 and may include one or more processing circuits or modules, such as any combination of Central Processing Units (CPUs) and/or general purpose microprocessors, microcontrollers, Digital Signal Processors (DSPs), Field Programmable Gate Arrays (FPGAs), Programmable Logic Devices (PLDs), controllers, state machines, gating logic, discrete hardware components, dedicated hardware finite state machines, or any other suitable circuits, devices, and/or structures capable of performing data calculations or other operations.

Memory 206, which may include Read Only Memory (ROM) and Random Access Memory (RAM), may provide instructions and data to processor 204. A portion of the memory 206 may also include non-volatile random access memory (NVRAM). The processor 204 typically performs logical and arithmetic operations based on program instructions stored in the memory 206. Instructions stored in memory 206 (also referred to as software) may be executed by processor 204 to perform the methods described herein. The processor 204 and the memory 206 collectively form a processing system that stores and executes software. As used herein, "software" refers to any type of instructions, whether software, firmware, middleware, microcode, etc., that can configure a machine or device to perform one or more desired functions or processes. The instructions may include code (e.g., in source code format, binary code format, executable code format, or any other suitable code format). The instructions, when executed by one or more processors, cause the processing system to perform the various functions described herein.

Transceiver 210, which includes transmitter 212 and receiver 214, allows BS 200 to transmit data to and receive data from a remote device (e.g., a UE or another BS). An antenna 250 is typically attached to the housing 240 and electrically coupled to the transceiver 210. In various embodiments, BS 200 includes (not shown) multiple transmitters, multiple receivers, and multiple transceivers. In one embodiment, the antenna 250 is replaced by a multi-antenna array 250, which multi-antenna array 250 may form multiple beams, each beam pointing in a different direction. The transmitter 212 may be configured to wirelessly transmit data packets having different packet types or functions, which are generated by the processor 204. Similarly, the receiver 214 is configured to receive data packets having different packet types or functionalities, and the processor 204 is configured to process data packets of a plurality of different packet types. For example, the processor 204 may be configured to determine the type of data packet and process the data packet and/or fields of the data packet accordingly.

In wireless communication, the BS 200 may receive an uplink transmission from a UE, wherein the uplink transmission is performed based on a transmission power associated with a power control parameter. For example, the uplink transmission scheduler 220 in this example may schedule a plurality of uplink transmissions in a plurality of corresponding cells supported by the UE, respectively. Each of the plurality of uplink transmissions is an earliest uplink transmission scheduled in a respective cell after a trigger condition associated with the PHR is satisfied. According to various embodiments, the plurality of uplink transmissions includes transmissions on at least one uplink transmission (e.g., PUSCH) scheduled by Downlink Control Information (DCI) and transmissions on at least one configured authorized uplink transmission (e.g., configured authorized PUSCH).

The PHR carrier analyzer 224 in this example may receive, from the UE, an uplink transmission determined from a plurality of uplink transmissions carrying a Power Headroom Report (PHR) MAC CE including a report of at least one Power Headroom Report (PHR). At least one PHR may be determined for a plurality of uplink transmissions from the UE to the BS 200. The PHR analyzer 222 in this example may analyze the PHR MAC CE.

In one embodiment, the uplink transmission is determined based on a comparison of the following time domain locations: an end symbol or a reception time of DCI used to schedule each of at least one uplink transmission (e.g., at least one PUSCH); and a predetermined number of time units before a starting symbol of each of the at least one configured granted uplink transmission (e.g., the at least one configured granted PUSCH). In another embodiment, the uplink transmission is determined based on a comparison of the following time domain locations: an end symbol or a reception time of the DCI for scheduling each of the at least one uplink transmission; and a start symbol for each of the at least one configured grant uplink transmission.

In another embodiment, the uplink transmission is received on a grant uplink transmission having a configuration of K repetitions. The PHR is carried based on one of the following ways: the PHR is carried by the uplink transmission only if the uplink transmission corresponds to a first repetition of the configured uplink transmission; when the uplink transmission corresponds to any repetition of the configured authorized uplink transmission, the PHR is carried by the uplink transmission and will not be carried by any subsequent repetition of the configured authorized uplink transmission; alternatively, when the uplink transmission corresponds to any repetition of the configured authorized uplink transmission, the PHR is carried by the uplink transmission and will be carried by each subsequent repetition of the configured authorized uplink transmission.

In one embodiment, the uplink transmission is received by the PHR carrier analyzer 224 on the uplink transmission scheduled by the DCI for carrying the PHR. The at least one PHR may be determined by at least one of: the UE determines a virtual PHR for each of a plurality of corresponding cells corresponding to the first configured authorized uplink transmission, wherein a time position at a predetermined number of time units before a start symbol of the first configured authorized uplink transmission is later than an end symbol of the DCI. The UE determines an actual PHR for each of a plurality of uplink transmissions corresponding to a second configured authorized uplink transmission, wherein a time position at a predetermined number of time units before a start symbol of the second configured authorized uplink transmission is no later than an end symbol of the DCI.

In another embodiment, a UE determines an actual PHR for each of a plurality of uplink transmissions corresponding to a configured authorized uplink transmission that at least partially overlaps with the uplink transmission carrying the PHR; and the UE determines a virtual PHR for each of a plurality of uplink transmissions corresponding to a configured authorized uplink transmission that does not overlap with the uplink transmission carrying the PHR.

In one embodiment, the plurality of uplink transmissions includes at least one Sounding Reference Signal (SRS) transmission. The uplink transmission is received by the PHR carrier analyzer 224 on an uplink transmission (e.g., PUSCH) associated with a reference time location and used to carry the PHR. In one example, the reference time location is at an end symbol of the DCI scheduling the uplink transmission. In another example, when the uplink transmission is a configured authorized uplink transmission (e.g., a configured authorized PUSCH), the reference time position is a first predetermined number of time units before a starting symbol of the uplink transmission.

For a PHR determined based on the SRS, an actual PHR is determined for: each of the at least one SRS transmission; each periodic SRS transmission of the at least one SRS transmission; each periodic SRS transmission in the at least one SRS transmission having a starting symbol no later than a reference time position by more than a second predetermined number of time units; each semi-persistent SRS transmission in the at least one SRS transmission, the semi-persistent SRS transmission activated by a control unit whose ending symbol is no later than a reference time position; and/or each aperiodic SRS transmission in the at least one SRS transmission triggered by the DCI having an end symbol no later than the reference time location. For a PHR determined based on the SRS, a virtual PHR is determined for: each periodic SRS transmission in the at least one SRS transmission having a starting symbol that exceeds a second predetermined number of time units later than the reference time position; each semi-persistent SRS transmission in the at least one SRS transmission, the semi-persistent SRS transmission activated by a control unit having an ending symbol later than a reference time position; and/or each aperiodic SRS transmission in the at least one SRS transmission triggered by the DCI having an end symbol later than the reference time location.

In one embodiment, the uplink transmission is received by the PHR carrier analyzer 224 on the uplink transmission associated with the deadline position and used to carry the PHR. The deadline position is a latest time for the UE to determine a transmit power for the uplink transmission on the uplink transmission. In this case, the at least one PHR may be determined by at least one of the following. A virtual PHR is determined for each of a plurality of uplink transmissions corresponding to a configured licensed uplink transmission having a starting symbol that exceeds a predetermined number of time units later than a deadline position. An actual PHR is determined for each of a plurality of uplink transmissions corresponding to a configured licensed uplink transmission whose starting symbol is no later than a deadline position by more than a predetermined number of time units. A virtual PHR is determined for each of a plurality of uplink transmissions corresponding to uplink transmissions scheduled by the DCI whose ending symbol is later than the deadline position. An actual PHR is determined for each of a plurality of uplink transmissions corresponding to uplink transmissions scheduled by the DCI whose end symbol is no later than the deadline position. For example, the uplink transmission may be a PUSCH.

The power control parameter configurator 226 in this example may be configured to calculate the power control parameters of the PHR. In one embodiment, for each of a plurality of corresponding cells that do not correspond to uplink transmissions carrying a PHR, the power control parameter configurator 226 may determine a configuration of at least one power control parameter associated with uplink transmissions scheduled by the DCI or authorized uplink transmissions configured in the corresponding cell. The configuration of the at least one power control parameter is used to determine a PHR for the corresponding cell. For example, the uplink transmission may be a PUSCH.

In one embodiment, the configuration of the at least one power control parameter is determined based on: a decision of the UE, wherein the configuration is indicated by at least one bit in the PHR MAC CE; a default uplink transmission type predefined according to a semi-static configuration of BS 200 or according to the system; a dynamic indication of the corresponding cell from BS 200; whether each of the uplink transmission scheduled by the DCI and the configured authorized uplink transmission corresponds to an actual PHR or a virtual PHR; an end symbol of the DCI for scheduling uplink transmission; a predetermined number of time units before a configured starting symbol granting uplink transmission; a transmission time for each of an uplink transmission scheduled by the DCI and a configured authorized uplink transmission; whether each of the uplink transmission scheduled by the DCI and the configured authorized uplink transmission overlaps with an uplink transmission carrying the PHR; and/or whether each of the uplink transmission scheduled by the DCI and the configured granted uplink transmission is a first uplink transmission that overlaps with an uplink transmission carrying the PHR.

The power module 208 may include a power source and a power conditioner, such as one or more batteries, to provide conditioned power to each of the modules described above in fig. 2. In some embodiments, if BS 200 is coupled to a dedicated external power source (e.g., a wall electrical outlet), power module 208 may include a transformer and a power regulator.

The various modules described above are coupled together by a bus system 230. The bus system 230 may include a data bus and, in addition to the data bus, include, for example, a power bus, a control signal bus, and/or a status signal bus. It should be appreciated that the modules of BS 200 may be operatively coupled to each other using any suitable techniques and media.

Although many separate modules or components are shown in FIG. 2, one of ordinary skill in the art will appreciate that one or more of the modules may be combined or implemented together. For example, the processor 204 may perform not only the functions described above with respect to the processor 204, but also the functions described above with respect to the uplink transmission scheduler 220. Rather, each of the modules shown in fig. 2 may be implemented using a plurality of separate components or elements.

Fig. 3 illustrates a flow diagram of a method 300 performed by a BS (e.g., BS 200 in fig. 2) for uplink data transmission in accordance with some embodiments of the present disclosure. At operation 302, the BS schedules a plurality of uplink transmissions in a plurality of corresponding cells supported by the UE, respectively. At operation 304, the BS receives, from the UE, an uplink transmission determined from a plurality of uplink transmissions for carrying a Power Headroom Report (PHR) in a first cell. At operation 306, the BS determines a configuration of at least one power control parameter associated with the uplink transmission scheduled by the DCI or the configured authorized uplink transmission in each cell other than the first cell. The order of the steps shown in fig. 3 may be varied according to different embodiments of the present disclosure.

Fig. 4 illustrates a block diagram of a UE 400 in accordance with some embodiments of the present disclosure. UE 400 is an example of a device that may be configured to implement the various methods described herein. As shown in fig. 4, the UE 400 includes a housing 440, the housing 440 containing a system clock 402, a processor 404, a memory 406, a transceiver 410 including a transmitter 412 and a receiver 414, a power supply module 408, a power headroom determiner 420, a PHR generator 422, a PHR carrier determiner 424, and a power control parameter determiner 426.

In this embodiment, system clock 402, processor 404, memory 406, transceiver 410, and power module 408 operate in a manner similar to system clock 202, processor 204, memory 206, transceiver 210, and power module 208 in BS 200. An antenna 450 or multi-antenna array 450 is typically attached to the housing 440 and electrically coupled to the transceiver 410.

The power headroom determiner 420 in this example may determine a plurality of uplink transmissions in a plurality of corresponding cells supported by the UE 400, respectively; and determining at least one Power Headroom Report (PHR) for a plurality of uplink transmissions from the UE 400 to the BS. Each of the plurality of uplink transmissions is an earliest uplink transmission scheduled in a corresponding cell after a trigger condition associated with the PHR is satisfied. According to various embodiments, the plurality of uplink transmissions includes transmissions on at least one uplink transmission (e.g., at least one PUSCH) scheduled by Downlink Control Information (DCI), and transmissions on at least one configured authorized uplink transmission (e.g., at least one configured authorized PUSCH).

The PHR generator 422 in this example may generate a Power Headroom Report (PHR) MAC CE for reporting at least one PHR. The PHR carrier determiner 424 in this example may determine an uplink transmission for carrying a PHR from a plurality of uplink transmissions.

In one embodiment, the PHR carrier determiner 424 may determine the uplink transmission by comparing the time domain locations of: an end symbol of the DCI for scheduling each of the at least one uplink transmission; and a predetermined number of time units before a starting symbol of each of the at least one configured grant uplink transmission. In another embodiment, the PHR carrier determiner 424 may determine the uplink transmission by comparing the time domain locations of: an end symbol of the DCI for scheduling each of the at least one uplink transmission; and a start symbol for each of the at least one configured grant uplink transmission.

In various embodiments, the PHR carrier determiner 424 may determine the authorized uplink transmissions with a configuration of K repetitions. The PHR may be carried based on one of the following ways: the PHR is carried by the uplink transmission only if the uplink transmission corresponds to a first repetition of the configured granted uplink transmission; when the uplink transmission corresponds to any repetition of the configured authorized uplink transmission, the PHR is carried by the uplink transmission and will not be carried by any subsequent repetition of the configured authorized uplink transmission; alternatively, when the uplink transmission corresponds to any repetition of the configured authorized uplink transmission, the PHR is carried by the uplink transmission and will be carried by each subsequent repetition of the configured authorized uplink transmission.

In one embodiment, the PHR carrier determiner 424 determines the uplink transmission scheduled by the DCI for carrying the PHR. The at least one PHR may be determined by at least one of: the power headroom determiner 420 determines a virtual PHR for each of a plurality of corresponding cells corresponding to the first configured authorized uplink transmission, wherein a time position at a predetermined number of time units before a start symbol of the first configured authorized uplink transmission is later than an end symbol of the DCI. The power headroom determiner 420 determines an actual PHR for each of a plurality of uplink transmissions corresponding to the second configured authorized uplink transmission, wherein a time position at a predetermined number of time units before a start symbol of the second configured authorized uplink transmission is not later than an end symbol of the DCI.

In another embodiment, the power headroom determiner 420 determines an actual PHR for each of a plurality of uplink transmissions corresponding to a configured authorized uplink transmission that at least partially overlaps the uplink transmission; and the power headroom determiner 420 determines a virtual PHR for each of a plurality of uplink transmissions corresponding to a configured authorized uplink transmission that does not overlap with the uplink transmission.

In one embodiment, the plurality of uplink transmissions includes at least one Sounding Reference Signal (SRS) transmission. The PHR carrier determiner 424 determines uplink transmissions associated with the reference time location and used to carry the PHR. In one example, the reference time position is located at an end symbol of the DCI scheduling the uplink transmission. In another example, when the uplink transmission is a configured grant uplink transmission, the reference time position is a first predetermined number of time units before a starting symbol of the uplink transmission.

For SRS-based PHR, power headroom determiner 420 may determine an actual PHR for: each of the at least one SRS transmission; each periodic SRS transmission of the at least one SRS transmission; each periodic SRS transmission in the at least one SRS transmission having a starting symbol no later than the reference time position by more than a second predetermined number of time units; each semi-persistent SRS transmission in the at least one SRS transmission activated by a control unit whose ending symbol is no later than the reference time position; and/or each aperiodic SRS transmission in the at least one SRS transmission triggered by the DCI having an end symbol no later than the reference time location. For SRS-based PHR, power headroom determiner 420 may determine a virtual PHR for: each periodic SRS transmission in the at least one SRS transmission having a starting symbol that exceeds a second predetermined number of time units later than the reference time position; each semi-persistent SRS transmission in the at least one SRS transmission activated by a control unit having an ending symbol later than the reference time position; and/or each aperiodic SRS transmission in the at least one SRS transmission triggered by the DCI having an end symbol later than the reference time location.

In one embodiment, the PHR carrier determiner 424 determines uplink transmissions associated with the deadline position and used to carry the PHR. The deadline position is a latest time for the UE to determine a transmit power for the uplink transmission on the uplink transmission. In this case, the at least one PHR may be determined by at least one of the following. The power headroom determiner 420 determines a virtual PHR for each of a plurality of uplink transmissions corresponding to a configured authorized uplink transmission whose starting symbol exceeds a predetermined number of time units later than a deadline position. The power headroom determiner 420 determines an actual PHR for each of a plurality of uplink transmissions corresponding to a configured authorized uplink transmission whose starting symbol is no later than the deadline position by more than a predetermined number of time units. The power headroom determiner 420 determines a virtual PHR for each of a plurality of uplink transmissions corresponding to uplink transmissions scheduled by DCI whose end symbol is later than a deadline position. The power headroom determiner 420 determines an actual PHR for each of a plurality of uplink transmissions corresponding to grant-based uplink transmissions scheduled by DCI whose end symbol is no later than a deadline position.

The power control parameter determiner 426 in this example may determine the power control parameters used by the power headroom determiner 420 to calculate the PHR. In one embodiment, for each of a plurality of corresponding cells that do not correspond to uplink transmissions carrying a PHR, the power control parameter determiner 426 may determine a configuration of at least one power control parameter associated with the uplink transmissions scheduled by the DCI or a licensed uplink transmission configured in the corresponding cell. The configuration of the at least one power control parameter is utilized by the power headroom determiner 420 to determine the PH of the corresponding cell.

In one embodiment, the configuration of the at least one power control parameter is determined by the power control parameter determiner 426 based on: a decision of the UE 400, wherein the configuration is indicated by at least one bit in a control unit comprising the PHR; a default uplink transmission type predefined according to a semi-static configuration of the BS or according to the system; a dynamic indication from the BS for the corresponding cell; whether each of the uplink transmission scheduled by the DCI and the configured authorized uplink transmission corresponds to an actual PHR or a virtual PHR; an end symbol of the DCI for scheduling uplink transmission; a predetermined number of time units before a configured starting symbol granting uplink transmission; a transmission time for each of the uplink transmission scheduled by the DCI and the configured authorized uplink transmission; whether each of the uplink transmission scheduled by the DCI and the configured authorized uplink transmission overlaps with an uplink transmission carrying the PHR; and/or whether each of the uplink transmission scheduled by the DCI and the configured granted uplink transmission is a first uplink transmission that overlaps with an uplink transmission carrying the PHR.

The various modules described above are coupled together by a bus system 430. The bus system 430 may include a data bus and, in addition to the data bus, include, for example, a power bus, a control signal bus, and/or a status signal bus. It should be appreciated that the modules of UE 400 may be operatively coupled to each other using any suitable techniques and media.

Although many separate modules or components are shown in fig. 4, one of ordinary skill in the art will appreciate that one or more of the modules may be combined or implemented together. For example, the processor 404 may implement not only the functionality described above with respect to the processor 404, but also the functionality described above with respect to the power headroom determiner 420. Rather, each of the modules shown in fig. 4 may be implemented using a plurality of separate components or elements.

Fig. 5 illustrates a flow diagram of a method 500 performed by a UE (e.g., UE 400 in fig. 4) for reporting a PHR, in accordance with some embodiments of the present disclosure. At operation 502, the UE determines a plurality of uplink transmissions in a plurality of corresponding cells supported by the UE, respectively. At operation 504, the UE determines at least one Power Headroom Report (PHR) for a plurality of uplink transmissions from the UE to the BS. At operation 506, the UE generates a Power Headroom Report (PHR) MAC CE for reporting at least one PHR to the BS. At operation 508, the UE determines an uplink transmission from the plurality of uplink transmissions for carrying the PHR in the first cell. At operation 510, the UE determines a configuration of at least one power control parameter associated with the configured authorized uplink transmission or the uplink transmission scheduled by the DCI in each cell other than the first cell. The order of the steps shown in fig. 5 may be varied according to different embodiments of the present disclosure.

Various embodiments of the present disclosure will now be described in detail below. It is noted that features of the embodiments and examples in the present disclosure may be combined with each other in any manner without conflict.

In a first embodiment, it is determined whether the PHR is carried by grant-based uplink transmissions or by unlicensed uplink transmissions. Grant-based uplink transmissions (e.g., grant-based PUSCH) are uplink transmissions scheduled by a grant; while an unlicensed uplink transmission (e.g., unlicensed PUSCH) is a configured licensed uplink transmission.

The base station configures a set of PHR triggering parameters for the terminal. The terminal determines when to trigger the PHR based on the set of PHR trigger parameters. The set of PHR trigger parameters includes at least one of: a PHR period timer, a PHR prohibit timer, a path loss change threshold, whether feedback of type 2PHR is required by another Cell Group (CG), whether feedback of multiple PHR is required, etc.

As shown in fig. 6, the terminal determines that the PHR is triggered at time t 0600, and the terminal supports a plurality of cells for uplink transmission. After time t 0600, there is an unlicensed PUSCH 1612 that would be transmitted on Cell1 without DCI scheduling, there is a retransmission re-PUSCH 2622 that is scheduled by DCI 2620 and would be transmitted on Cell2, there is a PUSCH 3632 that is scheduled by DCI 3630 and would be transmitted on Cell3, and there is a PUSCH 4642 that is scheduled by DCI 4640 and would be transmitted on Cell 4. The terminal needs to decide which Cell's PHR on PUSCH to feed back based on the semi-static configuration of the base station or system pre-definition according to at least one of the following rules.

According to a first rule, after PHR is triggered, it is determined which cell's DCI end symbol or "virtual DCI end symbol" has the earliest time domain position. The PHR is then carried by the PUSCH corresponding to the DCI end symbol or "virtual DCI end symbol" of the cell thus determined. For a specific cell, the DCI is the DCI that the terminal first receives after the PHR is triggered for scheduling the non-retransmitted PUSCH on the cell. For a specific cell, the "virtual DCI end symbol" is a time position determined by pushing back T time elements 605 from the starting symbol of the first transmitted unlicensed PUSCH after PHR is triggered, according to a semi-static configuration of a base station or system pre-definition. As shown in fig. 6, time t 1601 is "virtual DCI end symbol". The time units may be symbols, minislots, slots, subframes, etc. The value of T may be the minimum of N2 or K2.

According to this rule, in fig. 6, since time t 1601 is before DCI 4640 end symbol and DCI 3630 end symbol, the terminal will feed back PHR on unlicensed PUSCH1 on Cell 1.

According to this rule, the time domain position of a DCI end symbol of a particular cell may be the same as the time domain position of a "virtual DCI end symbol" of another cell. Then, based on the semi-static configuration or system pre-definition of the base station, it is determined which cell's PUSCH should be used to carry the PHR in this case. For example, in this case, the PHR may be fed back on the PUSCH scheduled by the DCI according to a semi-static configuration of the base station or system pre-definition.

According to a second rule, after PHR is triggered, it is determined which cell's DCI end symbol or unlicensed PUSCH start symbol has the earliest time domain position. The PHR is then carried by the PUSCH corresponding to the DCI cell so determined or the unlicensed PUSCH of the cell so determined. For a specific cell, the DCI is the DCI that the terminal first receives after the PHR is triggered for scheduling the non-retransmitted PUSCH on the cell. For a specific cell, the unlicensed PUSCH start symbol is the start symbol of an unlicensed PUSCH that is first transmitted after PHR is triggered, according to a semi-static configuration or system pre-definition of a base station. In fig. 7, the unlicensed PUSCH start symbol on Cell2 is time t 1701. According to this rule, in fig. 7, since time t 1701 is after DCI 4740 end symbol, the terminal will feed back PHR on PUSCH 4742 on Cell 4.

According to this rule, the time domain position of the DCI end symbol of a particular cell may be the same as the time domain position of the unlicensed PUSCH start symbol of another cell. Then, based on the semi-static configuration or system pre-definition of the base station, it is determined which cell's PUSCH should be used to carry the PHR in this case. For example, in this case, the PHR may be fed back on the PUSCH scheduled by the DCI according to a semi-static configuration of the base station or system pre-definition.

The terminal determines on which PUSCH of which cell the PHR is fed back according to at least one of the above rules.

Further, the base station may semi-statically configure the unlicensed PUSCH to perform repeated transmissions, e.g., using a repetition factor of k, where k is any positive integer. That is, the unlicensed PUSCH needs to be repeatedly transmitted k times. If the terminal is to feedback PHR on unlicensed PUSCH, it may adopt one of the following modes based on semi-static configuration of the base station or system pre-definition. The present embodiment may also be extended to grant based PUSCH.

In the first mode, the terminal can only feed back the PHR on the first transmission of the unlicensed PUSCH, but not on (k-1) subsequent iterations. Thus, if the first transmission of the unlicensed PUSCH is before the PHR trigger time, the terminal cannot feed back the PHR on the subsequent (k-1) repetitions of the unlicensed PUSCH any more.

In the second mode, the terminal may transmit the feedback of the PHR at any one time among k repeated transmissions of the unlicensed PUSCH, but the PHR feedback will not be repeated and will only be transmitted once. For example, the terminal triggers PHR feedback at time t0, and then the terminal is going to transmit the nth repetition of the unlicensed PUSCH, where n is a positive integer no greater than k. The terminal feeds back the PHR on the nth repetition of the unlicensed PUSCH. But PHR feedback is no longer repeated on any subsequent (n +1) th through kth repetitions of unlicensed PUSCH.

In the third mode, the terminal may transmit the feedback of the PHR at any one of k repeated transmissions of the unlicensed PUSCH, and the PHR feedback may also be repeated on the unlicensed PUSCH which is repeatedly transmitted. For example, the terminal triggers PHR feedback at time t0, and then the terminal is going to transmit the nth repetition of the unlicensed PUSCH, where n is a positive integer no greater than k. The terminal feeds back the PHR on the nth repetition of the unlicensed PUSCH. PHR feedback is also repeated on each of the subsequent (n +1) th through k-th repetitions of unlicensed PUSCH.

In a second embodiment, it is disclosed how to determine the actual or virtual PHR for the unlicensed PUSCH of other cells when the PHR is carried on the grant based PUSCH. A terminal supports multiple cells for uplink transmission. After the PHR is triggered, the terminal determines that the PHR will be fed back on the PUSCH scheduled by the DCI of Cell 1. Based on the semi-static configuration or system pre-definition of the base station, the terminal has an unlicensed PUSCH to send on Cell2 and Cell 3. The terminal determines whether to calculate an actual PHR or a virtual PHR when calculating the PHR on Cell2 and Cell 3. This may be determined according to one of the following rules, which are based on a semi-static configuration of the base station or predefined by the system.

According to the first rule, for Cell2 and Cell3, after PHR is triggered (at time t 0800), the terminal needs to send unlicensed PUSCH 2822 and unlicensed PUSCH 3832 according to the semi-static configuration of the base station, as shown in fig. 8. For Cell2 and Cell3, the terminal may determine a "virtual DCI end symbol" based on the unlicensed PUSCH start symbol. The "virtual DCI end symbol" of the unlicensed PUSCH may correspond to symbol T1 determined by extending T time elements 805 backward from the unlicensed PUSCH start symbol. In fig. 8, the "virtual DCI end symbol" of unlicensed PUSCH 2822 on Cell2 is time t 1801; the "virtual DCI end symbol" of unlicensed PUSCH 3832 on Cell3 is time t 2802. The terminal may use the end symbol of the DCI scheduling the PUSCH carrying the PHR as a threshold. That is, the DCI 1810 end symbol in fig. 8 is used as the threshold. If the 'virtual DCI end symbol' of a specific cell is not later than the threshold, the terminal calculates the actual PHR for the cell; if the "virtual DCI end symbol" for a particular cell is later than the threshold, the terminal calculates a virtual PHR for that cell. According to a first rule, the terminal calculates the virtual PHR of Cell2 and calculates the actual PHR of Cell 3.

According to the second rule, for Cell2 and Cell3, after PHR is triggered (at time t 0800), the terminal needs to send unlicensed PUSCH2 and unlicensed PUSCH3 according to the semi-static configuration of the base station. The terminal determines whether to calculate an actual PHR or a virtual PHR for each of Cell2 and Cell3 based on whether each of unlicensed PUSCH2 and unlicensed PUSCH3 overlaps with PUSCH1 carrying a PHR. Calculating an actual PHR for a particular cell if an unlicensed PUSCH on the cell partially or completely overlaps with a PUSCH carrying the PHR; if the unlicensed PUSCH on a particular cell does not overlap with the PUSCH carrying the PHR, a virtual PHR is calculated for that cell. For example, as shown in fig. 8, unlicensed PUSCH 2822 on Cell2 and unlicensed PUSCH 3832 on Cell3 both overlap with PHR-carrying PUSCH 1812. Thus, according to the second rule, the terminal calculates the actual PHR on Cell2 and Cell 3.

In a third embodiment, it is disclosed how to determine an actual or virtual PHR for a type 3 PHR. If the terminal wants to feed back the type 3PHR of a specific cell, the terminal needs to decide whether to calculate an actual PHR or a virtual PHR for the type 3PHR of the cell. The type 3PHR is a Sounding Reference Signal (SRS) carried by the PHR, which may be one of a periodic SRS, a semi-persistent SRS, or an aperiodic SRS. The terminal determines to feed back an actual PHR or a virtual PHR for a specific type of SRS on the cell according to at least one of the following methods predefined by a system or a semi-static configuration based on the base station.

In method 3-1, for type 3PHR, only the actual PHR is fed back. If the actual PHR cannot be calculated, the type 3PHR is not fed back.

In method 3-2, for the periodic SRS, the terminal always feeds back the actual PHR.

In method 3-3, for the periodic SRS, the terminal first determines a "virtual DCI end symbol" determined by extending T time units backward from the SRS start transmission symbol. The time unit may be a symbol, a mini-slot, or a slot. And the terminal determines whether to calculate the actual PHR or the virtual PHR for the periodic SRS according to the sequence relation between the virtual DCI ending symbol and the first DCI ending symbol. If the 'virtual DCI ending symbol' is not later than the 'first DCI ending symbol', the terminal calculates an actual PHR for the periodic SRS; otherwise, the terminal calculates the virtual PHR. The "first DCI end symbol" is the end symbol of DCI scheduling the PUSCH carrying the PHR, or the "virtual DCI end symbol" corresponding to the unlicensed PUSCH carrying the PHR.

In methods 3-4, for semi-persistent SRS, SRS is activated by the MAC CE. The terminal may regard the received end symbol of the MAC CE as a "virtual DCI end symbol". According to the sequential relationship between the "virtual DCI end symbol" and the "first DCI end symbol", the terminal may determine whether to compute the actual PHR or the virtual PHR for the semi-persistent SRS. If the 'virtual DCI end symbol' is not later than the 'first DCI end symbol', the terminal calculates an actual PHR for the semi-persistent SRS; otherwise, the terminal calculates the virtual PHR. The "first DCI end symbol" is the end symbol of DCI scheduling the PUSCH carrying the PHR, or the "virtual DCI end symbol" corresponding to the unlicensed PUSCH carrying the PHR.

In methods 3-5, for aperiodic SRS, SRS is triggered by DCI. The terminal may regard the end symbol of the received DCI as a "virtual DCI end symbol". According to the sequential relationship between the "virtual DCI end symbol" and the "first DCI end symbol", the terminal determines whether to calculate an actual PHR or a virtual PHR for the aperiodic SRS. If the 'virtual DCI end symbol' is not later than the 'first DCI end symbol', the terminal calculates an actual PHR for the aperiodic SRS; otherwise, the terminal calculates the virtual PHR. The "first DCI end symbol" is the end symbol of DCI scheduling the PUSCH carrying the PHR, or the "virtual DCI end symbol" corresponding to the unlicensed PUSCH carrying the PHR.

In a fourth embodiment, it is disclosed how to determine whether PHR is calculated based on unlicensed PUSCH or based on licensed based PUSCH. A terminal supports multiple cells for uplink transmission. After PHR is triggered, the terminal determines to feed back PHR on PUSCH1 of Cell 1. For Cell2, the terminal may transmit PUSCH scheduled by DCI or unlicensed PUSCH semi-statically configured by the base station. For both types of PUSCH, the terminal may calculate the PHR using different open-loop power control parameters and/or different closed-loop power control parameters. Therefore, for the PHR on Cell2 that the terminal feeds back to the base station, it is desirable to have some way for the base station to know whether the PHR is calculated based on the PUSCH scheduled by DCI or calculated based on the unlicensed PUSCH. Both the base station and the terminal may know the open-loop power control parameters and the closed-loop power control parameters for calculating the feedback PHR on Cell2 according to at least one of the following methods predefined by the system or based on the semi-static configuration of the base station.

In method 4-1, the indication in the PHR MAC CE may indicate whether the PHR is calculated based on the grant-based PUSCH power control parameter or the unlicensed PUSCH power control parameter. For example, one reserved bit in the PHR MAC CE may be used for the indication. When the bit is set to 1, it indicates that PHR is calculated based on the grant-based PUSCH power control parameter; when the bit is set to 0, it indicates that PHR is calculated based on the unlicensed PUSCH power control parameter. Alternatively, one or more bits in the PHR MAC CE may be used to indicate which candidate value set and/or which value mapping table of open-loop and/or closed-loop power control parameters the PHR is calculated based on.

The candidate set of open-loop power control parameters is predefined by the system or semi-statically configured by the base station, including at least one of: for P_OOne or more sets of candidate values; one or more sets of candidate values for α; for { P_Oα } of one or more candidate value sets; one or more measurement reference signals for measuring PL. A candidate set of closed loop power control parameters, which includes one or more TPC value mapping tables, is predefined by the system or semi-statically configured by the base station.

In method 4-2, assuming that there is a predetermined relationship between the PUSCH type and the PHR type, the base station determines whether the PHR is calculated based on the grant-based PUSCH power control parameter or the unlicensed PUSCH power control parameter according to an indication of whether the PHR is an actual type or a virtual type in the PHR MAC CE.

In method 4-3, a default PUSCH type is determined based on a semi-static configuration or system pre-definition of a base station. The terminal calculates a feedback PHR based on open-loop and/or closed-loop power control parameters corresponding to a default PUSCH type.

In method 4-4, the base station dynamically indicates to the terminal: for a PHR triggered on a cell within a certain time or a certain period of time, the terminal calculates and feeds back the PHR according to open-loop and/or closed-loop power control parameters based on a granted PUSCH or an unlicensed PUSCH. For example, a PHR type indication field may be added in DCI for the above indication; or the PHR type indication field may be added in the MAC CE for the above indication; alternatively, the DCI format type may be used for an implicit indication of a PUSCH type.

In method 4-5, the PUSCH type is determined based on the actual PHR priority principle. After the terminal triggers the PHR on the cell, if one of the grant-based PUSCH and the unlicensed PUSCH corresponds to an actual PHR and the other PUSCH corresponds to a virtual PHR, the terminal calculates the PHR on the basis of the PUSCH corresponding to the actual PHR, which may be one of the grant-based PUSCH and the unlicensed PUSCH. Specifically, the terminal calculates the PHR based on open-loop and/or closed-loop power control parameters corresponding to the PUSCH from which the actual PHR can be calculated, and feeds back the actual PHR on the cell. After receiving the actual PHR on the PUSCH, the base station determines that this is an actual PHR. Accordingly, the base station may determine whether the PHR is calculated based on open-loop and/or closed-loop power control parameters corresponding to which type of PUSCH (e.g., one of a grant-based PUSCH and an unlicensed PUSCH). If the two PUSCH types correspond to the same PHR type, e.g., actual PHR or virtual PHR, other methods disclosed herein may be used, e.g., using a base station based semi-static configuration or a system predefined default PUSCH type.

In method 4-6, the PUSCH type is determined based on the scheduling time priority principle. After the terminal triggers PHR on the cell, the DCI end symbol based on the granted PUSCH and the "virtual DCI end symbol" of the unlicensed PUSCH are compared to determine the PUSCH with an earlier scheduling time. The terminal will feed back the PHR calculated based on the open and/or closed loop power control parameters corresponding to the PUSCH with the earlier scheduling time. The "virtual DCI end symbol" is a time position determined by pushing back T time units from the starting symbol of the first transmitted unlicensed PUSCH after PHR is triggered, according to a semi-static configuration of a base station or system pre-definition. As shown in fig. 6, time t 1601 is "virtual DCI end symbol". The time units may be symbols, minislots, slots, subframes, etc. The value of T may be the minimum of N2 or K2.

In methods 4-7, the PUSCH type is determined based on the transmission time priority principle. After the terminal triggers PHR on the cell, the transmission times of the unlicensed PUSCH and the grant-based PUSCH are compared to determine a PUSCH with an earlier transmission time. The terminal will feed back the PHR calculated based on the open-loop and/or closed-loop power control parameters corresponding to the PUSCH with an earlier transmission time for the cell.

In methods 4-8, the PUSCH type is determined based on the overlapping time priority principle. If only one of the unlicensed PUSCH and the grant-based PUSCH partially or completely overlaps with the PUSCH carrying the PHR in the time domain, the terminal will feed back the PHR calculated based on the open-loop and/or closed-loop power control parameters corresponding to the overlapped PUSCH for the cell. If both unlicensed and grant-based PUSCHs partially or completely overlap in the time domain with the PUSCH carrying the PHR, the terminal will feed back the PHR calculated based on the open-loop and/or closed-loop power control parameters corresponding to the overlapping PUSCH with earlier transmission times for the cell.

In a fifth embodiment, the PHR is fed back based on a look-ahead mechanism. If the uplink power control of the terminal supports the look-ahead mechanism, the terminal may not decide the transmission power of the uplink transmission immediately after receiving the DCI for scheduling the uplink transmission, but may wait until a certain deadline to decide the transmission power of the uplink transmission. In this embodiment, the terminal calculates the PHR once based on a look-ahead mechanism. Accordingly, the terminal may decide whether to feed back an actual PHR or a virtual PHR for each cell at the deadline.

As shown in fig. 9, the terminal has PHR feedback triggered at time 900 at t 0. The terminal determines to transmit PHR feedback of Cell1, Cell2, and Cell3 on PUSCH 1912 scheduled by DCI 1910 on Cell 1. Let t1 time 901 be the cutoff time for determining the uplink transmission power.

For Cell2, the terminal determines the "virtual DCI end symbol" of the unlicensed PUSCH 2922. The "virtual DCI end symbol" is the time position determined by pushing back T time elements 905 from the starting symbol of the unlicensed PUSCH 2922. As shown in fig. 9, time t 2902 is a "virtual DCI end symbol". The time units may be symbols, minislots, slots, subframes, etc. The value of T may be N2, or the minimum value of K2. Here, N2 is

K2 is a minimum of a plurality of candidate scheduling delays between scheduling DCI and PUSCH scheduled by DCI, or between scheduling DCI and PDSCH scheduled by DCI, based on a semi-static configuration of a base station or system pre-definition. Therefore, at Cell2, the "virtual DCI end symbol", i.e., time t 2902, precedes time t 1901. Therefore, the terminal calculates and feeds back the actual PHR on Cell 2.

For Cell3, the end symbol of DCI 3930 used to schedule PUSCH 3932 is before expiration time t 1901. Therefore, for Cell3, the terminal calculates and feeds back the actual PHR.

For Cell4, the end symbol of DCI 4940 used to schedule PUSCH 4942 is after expiration time t 1901. Therefore, for Cell4, the terminal calculates and feeds back a virtual PHR.

As shown in fig. 10, the deadline is a time position determined by pushing back n time units from a start symbol of the PUSCH carrying the PHR, resulting in a time point t 11001. Alternatively, the deadline t 11001 is determined by pushing forward m time units from the end symbol of the DCI 1010 scheduling the PUSCH 1012 carrying the PHR. The time units may be symbols, minislots, slots, etc. The value of n may be determined based on any of the following methods.

In the method 5-1, the value of n may be equal to the time delay for the terminal to process HARQ-ACK feedback corresponding to the PDSCH, and the specific values are:

wherein

The variables involved in this formula have the following values. The value of N1 relates to the terminal capabilities, PDSCH parameter set, uplink transmission parameter set and DMRS time-frequency resource location. d_1,1The value of (d) is related to PDSCH mapping type, terminal capability and PDSCH time domain length. The values of μ relate to a set of PDCCH parameters, a set of PDSCH parameters, and a set of uplink transmission parameters. Time unit T_c＝1/(Δf_max·N_f) Wherein Δ f_max＝480·10³Hz and N_f4096. Constant k ═ T_s/T_c64 where T_s＝1/(Δf_ref·N_f,ref)，Δf_ref＝15·10³Hz and N_f,ref＝2048。

In method 5-2, the value of n may be related to the time delay for the terminal to process HARQ-ACK feedback corresponding to PDSCH, and is specifically:

wherein

As described above, and k is a constant value such as 0.5, 1, or the like.

In method 5-3, the value of n may be related to the time delay for the terminal to process HARQ-ACK feedback corresponding to PDSCH, and is specifically:

wherein

As described above, and k is an integer value such as 1, 2, 3, etc.

In method 5-4, the value of n may be equal to the time delay for the terminal to process HARQ-ACK feedback corresponding to the semi-persistent PDSCH release command, and specifically the values are:

wherein

The variables involved in this formula have the following values. The value of N is related to the terminal capabilities and the PDCCH parameter set, while other parameters have been discussed above. For a UE with processing capability 1 and for SCS for PDCCH reception, N is 10 for 15kHz, 12 for 30kHz, 22 for 60kHz, and 25 for 120 kHz. For a UE with capability 2 and for SCS received on PDCCH, N is 5 for 15kHz, 5.5 for 30kHz, and 11 for 60 kHz.

In method 5-5, the value of n may be related to the time delay for the terminal to process the HARQ-ACK feedback corresponding to the semi-persistent PDSCH release command, and is specifically:

wherein

As described above, and k is a constant value such as 0.5, 1, or the like.

In methods 5-6, the value of n may be related to the time delay for the terminal to process the HARQ-ACK feedback corresponding to the semi-persistent PDSCH release command, and is specifically:

wherein

As described above, and k is an integer value such as 1, 2, 3, etc.

In methods 5-7, the value of n may be equal to the time delay for the terminal to process the PUSCH scheduled by the PDCCH, and the specific values are:

wherein

The variables involved in this formula have the following values. N is a radical of₂Value of and terminal capability, PDCCH parameter set anduplink transmission parameter set related; d_2,10 or d_2,1＝1；d_2,20 or d_2,2Equal to the BWP conversion delay; while other parameters have been discussed above.

In methods 5-8, the value of n may be related to the time delay for the terminal to process the PUSCH scheduled by the PDCCH, and is specifically:

wherein

As described above, and k is a constant value such as 0.5, 1, or the like.

In methods 5-9, the value of n may be related to the time delay for the terminal to process the PUSCH scheduled by the PDCCH, and is specifically:

wherein

As described above, and k is an integer value such as 1, 2, 3, etc.

In methods 5-10, the value of n may be equal to the time delay of the terminal processing the PUCCH or PUSCH including aperiodic CSI feedback, and the specific values are:

wherein

The variables involved in this formula have the following values. The value of Z is related to terminal capabilities, number of updated CSI reports, etc.; d is 2 or 3 or 4; while other parameters have been discussed above.

In methods 5-11, the value of n may be related to the time delay of the terminal processing the PUCCH or PUSCH including aperiodic CSI feedback, and is specifically:

wherein

As described above, and k is a constant of value (e.g., 0.5, 1, etc.).

In methods 5-12, the value of n may be related to the time delay of the terminal processing the PUCCH or PUSCH including aperiodic CSI feedback, and is specifically:

wherein

As described above, and k is an integer value such as 1, 2, 3, etc.

In the present application, technical features in various embodiments may be combined in one embodiment without conflict. Each embodiment is merely an example embodiment of the present application.

In all of the above embodiments, the different "application types" mentioned may be at least one of: different service modes, such as URLLC and eMBB, which are determined based on semi-static configuration of the base station or system pre-definition; according to different services of the dynamic indication of the DCI, for example, different DCI format indications, or different DCI size indications, or different RNTI indications of scrambled DCI, or different DCI blind detection method indications, or fields indicated in the DCI; different sets of candidate values corresponding to open loop power control parameters; different reference signals for path loss measurements; a map of different values corresponding to the closed loop power control parameter.

While various embodiments of the present disclosure have been described above, it should be understood that they have been presented by way of example only, and not limitation. Likewise, the various figures may depict example architectures or configurations provided to enable one of ordinary skill in the art to understand the example features and functionality of the present disclosure. However, those skilled in the art will appreciate that the present disclosure is not limited to the exemplary architectures or configurations shown, but may be implemented using a variety of alternative architectures and configurations. In addition, one or more features of one embodiment may be combined with one or more features of another embodiment described herein, as would be understood by one of ordinary skill in the art. Thus, the breadth and scope of the present disclosure should not be limited by any of the above-described exemplary embodiments.

It will also be understood that any reference herein to an element using a name such as "first," "second," etc., does not generally limit the number or order of such elements. Rather, these names are used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, reference to first and second elements does not imply that only two elements can be used or that the first element must somehow precede the second element.

Further, those of ordinary skill in the art would understand that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and the like that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

Those of ordinary skill would further appreciate that any of the various illustrative logical blocks, modules, processors, means, circuits, methods, and functions described in connection with the aspects disclosed herein may be implemented as electronic hardware (e.g., a digital implementation, an analog implementation, or a combination of the two), firmware, various forms of program or design code containing instructions (which may be referred to herein, for convenience, as "software" or a "software module"), or any combination of these technologies.

To clearly illustrate this interchangeability of hardware, firmware, and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software, or as a combination of such technologies, depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure. According to various embodiments, a processor, device, component, circuit, structure, machine, module, etc. may be configured to perform one or more of the functions described herein. The terms "configured to" or "configured to" as used herein with respect to a specified operation or function refer to a processor, device, component, circuit, structure, machine, module, etc., that is physically constructed, programmed, and/or arranged to perform the specified operation or function.

Furthermore, those of ordinary skill in the art will appreciate that the various illustrative logical blocks, modules, devices, components, and circuits described herein may be implemented within or performed by an Integrated Circuit (IC) that may include a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, or any combination thereof. The logic blocks, modules, and circuits may also include antennas and/or transceivers to communicate with various components within the network or within the device. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other suitable configuration for performing the functions described herein.

If implemented in software, the functions may be stored as one or more instructions or code on a computer-readable medium. Thus, the steps of a method or algorithm disclosed herein may be embodied as software stored on a computer readable medium. Computer-readable media includes both computer storage media and communication media including any medium that can be enabled to transfer a computer program or code from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.

In this application, the term "module" as used herein refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Additionally, for purposes of discussion, the various modules are described as discrete modules; however, as will be apparent to one of ordinary skill in the art, two or more modules may be combined to form a single module that performs the relevant functions according to embodiments of the present disclosure.

Further, in embodiments of the present disclosure, memory or other memory and communication components may be used. It will be appreciated that, for clarity, the above description has described embodiments of the disclosure with reference to different functional units and processors. It will be apparent, however, that any suitable distribution of functionality between different functional units, processing logic elements, or domains may be used without departing from the disclosure. For example, functionality illustrated to be performed by separate processing logic elements or controllers may be performed by the same processing logic elements or controllers. Thus, references to specific functional units are only to references to suitable means for providing the described functionality rather than indicative of a strict logical or physical structure or organization.

Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the novel features and principles disclosed herein as set forth in the following claims.

Claims

1. A method performed by a wireless communication device, the method comprising:

determining a plurality of uplink transmissions in a plurality of corresponding cells supported by the wireless communication device, respectively;

determining at least one Power Headroom Report (PHR) for the plurality of uplink transmissions from the wireless communication device to a wireless communication node;

generating a Power Headroom Report (PHR) Medium Access Control (MAC) Control Element (CE) for reporting the at least one PHR; and

determining an uplink transmission for carrying the PHR from the plurality of uplink transmissions.

2. The method of claim 1, wherein:

each of the plurality of uplink transmissions is an earliest uplink transmission scheduled in the corresponding cell after a trigger condition associated with the PHR is satisfied; and

the plurality of uplink transmissions includes at least one uplink transmission scheduled by Downlink Control Information (DCI) and at least one configured authorized uplink transmission.

3. The method of claim 1, wherein determining the uplink transmission comprises comparing time domain locations of:

an end symbol of the DCI for scheduling each of at least one of the plurality of uplink transmissions; and

a predetermined number of time units before a starting symbol of each of the at least one configured authorized uplink transmission of the plurality of uplink transmissions.

4. The method of claim 1, wherein determining the uplink transmission comprises comparing time domain locations of:

a starting symbol for each of the at least one configured authorized uplink transmission of the plurality of uplink transmissions.

5. The method of claim 1, wherein:

determining the uplink transmission comprises determining a granted uplink transmission having a configuration of K repetitions; and is

The PHR is carried based on one of the following ways:

the PHR is carried by an uplink transmission only if the uplink transmission corresponds to a first repetition of the configured granted uplink transmission,

when the uplink transmission corresponds to any repetition of the configured authorized uplink transmission, the PHR is carried by the uplink transmission and will not be carried by any subsequent repetition of the configured authorized uplink transmission, or

When the uplink transmission corresponds to any repetition of the configured authorized uplink transmission, the PHR is carried by the uplink transmission and will be carried by each subsequent repetition of the configured authorized uplink transmission.

6. The method of claim 1, wherein:

determining the uplink transmission comprises determining an uplink transmission scheduled by DCI for carrying the PHR; and

determining the at least one PHR comprises:

determining a virtual PHR for each of the plurality of corresponding cells corresponding to a first configured authorized uplink transmission, wherein a time position at a predetermined number of time units before a start symbol of the first configured authorized uplink transmission is later than an end symbol of the DCI, and

determining an actual PHR for each of the plurality of uplink transmissions corresponding to a second configured authorized uplink transmission, wherein a time position at the predetermined number of time units before a starting symbol of the second configured authorized uplink transmission is no later than the ending symbol of the DCI.

7. The method of claim 1, wherein:

determining the at least one PHR comprises:

determining an actual PHR for each of the plurality of uplink transmissions corresponding to a configured authorized uplink transmission that at least partially overlaps the uplink transmission, an

Determining a virtual PHR for each of the plurality of uplink transmissions corresponding to a configured authorized uplink transmission that does not overlap with the uplink transmission.

8. The method of claim 1, wherein:

the plurality of uplink transmissions comprises at least one Sounding Reference Signal (SRS) transmission;

determining the uplink transmission comprises determining an uplink transmission associated with a reference time location and used to carry the PHR;

the reference time position is located at an end symbol of the DCI scheduling the uplink transmission or, when the uplink transmission is a configured authorized uplink transmission, a first predetermined number of time units before a start symbol of the uplink transmission.

9. The method of claim 8, wherein determining the at least one PHR comprises determining an actual PHR for:

each of the at least one SRS transmission;

each periodic SRS transmission of the at least one SRS transmission;

each periodic SRS transmission in the at least one SRS transmission having a starting symbol no later than the reference time position by more than a second predetermined number of time units;

each semi-persistent SRS transmission in the at least one SRS transmission activated by a control unit whose ending symbol is no later than the reference time location; and/or

Each aperiodic SRS transmission in the at least one SRS transmission triggered by the DCI having an end symbol no later than the reference time location.

10. The method of claim 8, wherein determining the at least one PHR comprises determining a virtual PHR for:

each periodic SRS transmission in the at least one SRS transmission having a starting symbol that exceeds a second predetermined number of time units later than the reference time location;

each semi-persistent SRS transmission in the at least one SRS transmission activated by a control unit having an ending symbol later than the reference time location; and/or

Each aperiodic SRS transmission in the at least one SRS transmission triggered by the DCI having an end symbol later than the reference time location.

11. The method of claim 1, further comprising:

for each of the plurality of corresponding cells that do not correspond to the uplink transmission carrying the PHR, determining a configuration of at least one power control parameter associated with the uplink transmission scheduled by the DCI or a licensed uplink transmission configured in the corresponding cell,

wherein the configuration of the at least one power control parameter is used to determine a PHR for the corresponding cell.

12. The method of claim 11, wherein the configuration of the at least one power control parameter is determined based on:

a decision by the wireless communication device, wherein the configuration is indicated by at least one bit in a control element comprising the PHR;

a default uplink transmission type predefined according to a semi-static configuration of the wireless communication node or according to a system;

a dynamic indication of the corresponding cell from the wireless communication node;

whether each of the uplink transmission scheduled by the DCI and the configured authorized uplink transmission corresponds to an actual PHR or a virtual PHR;

an end symbol of DCI for scheduling the uplink transmission;

a predetermined number of time units before a starting symbol of the configured grant uplink transmission;

a transmission time for each of the uplink transmission scheduled by the DCI and the configured authorized uplink transmission;

whether each of the uplink transmission scheduled by the DCI and the configured authorized uplink transmission overlaps with an uplink transmission carrying the PHR; and/or

Whether each of the uplink transmission scheduled by the DCI and the configured authorized uplink transmission is a first uplink transmission that overlaps with an uplink transmission carrying the PHR.

13. The method of claim 1, wherein:

determining the uplink transmission comprises determining an uplink transmission associated with a deadline position and used to carry the PHR;

the deadline position is a latest time at which the wireless communication device determines a transmission power of the uplink transmission carrying the PHR; and

determining the at least one PHR comprises:

determining a virtual PHR for each of the plurality of uplink transmissions corresponding to a configured licensed uplink transmission whose starting symbol is more than a predetermined number of time units later than the deadline position,

determining an actual PHR for each of the plurality of uplink transmissions corresponding to a configured licensed uplink transmission whose starting symbol is no later than the deadline position by more than the predetermined number of time units,

determining a virtual PHR for each of the plurality of uplink transmissions corresponding to an uplink transmission scheduled by the DCI having an ending symbol later than the deadline position, and/or

Determining an actual PHR for each of the plurality of uplink transmissions corresponding to a grant-based uplink transmission scheduled by the DCI whose ending symbol is no later than the deadline position.

The inventor: these latter claims correspond substantially to 1-13, with reference to 1-13 being modified.

14. A method performed by a wireless communication node, the method comprising:

scheduling a plurality of uplink transmissions in a plurality of corresponding cells supported by the wireless communication device, respectively; and

receiving, from the wireless communication device, an uplink transmission determined from the plurality of uplink transmissions, the uplink transmission to carry a Power Headroom Report (PHR) Medium Access Control (MAC) Control Element (CE), the Power Headroom Report (PHR) Medium Access Control (MAC) Control Element (CE) comprising a report of at least one Power Headroom Report (PHR),

wherein the at least one PHR is determined for the plurality of uplink transmissions from the wireless communication device to the wireless communication node.

15. The method of claim 14, wherein:

each of the plurality of uplink transmissions is an earliest uplink transmission scheduled in the corresponding cell after a trigger condition associated with the PHR is satisfied; and is

16. The method of claim 14, wherein the uplink transmission is determined based on a comparison of time domain locations of:

17. The method of claim 14, wherein the uplink transmission is determined based on a comparison of time domain locations of:

18. The method of claim 14, wherein:

the uplink transmission is received on a granted uplink transmission having a configuration of K repetitions; and is

The PHR is carried based on one of the following ways:

19. The method of claim 14, wherein:

the uplink transmission is received on an uplink transmission scheduled by DCI to carry the PHR; and is

The at least one PHR is determined by:

20. The method of claim 14, wherein:

The at least one PHR is determined by:

determining an actual PHR for each of the plurality of uplink transmissions corresponding to a configured licensed uplink transmission that at least partially overlaps the uplink transmission carrying the PHR, and

determining a virtual PHR for each of the plurality of uplink transmissions corresponding to a configured licensed uplink transmission that does not overlap with the uplink transmission carrying the PHR.

21. The method of claim 14, wherein:

the uplink transmission is received on an uplink transmission associated with a reference time location and used to carry the PHR;

the reference time position is either at an end symbol of the DCI scheduling the uplink transmission or, when the uplink transmission is a configured authorized uplink transmission, a first predetermined number of time units before a start symbol of the uplink transmission.

22. The method of claim 21, wherein an actual PHR is determined for:

each of the at least one SRS transmission;

each periodic SRS transmission of the at least one SRS transmission;

23. The method of claim 21, wherein a virtual PHR is determined for:

24. The method of claim 14, further comprising:

25. The method of claim 24, wherein the configuration of the at least one power control parameter is determined based on:

an end symbol of DCI for scheduling the uplink transmission;

26. The method of claim 14, wherein:

the uplink transmission is received on an uplink transmission associated with a deadline position and used to carry the PHR;

the deadline position is a latest time at which the wireless communication device determines a transmit power of the uplink transmission on the uplink transmission; and

the at least one PHR is determined by:

27. A wireless communication device configured to perform the method of any of claims 1 to 13.

28. A wireless communication node configured to perform the method of any of claims 14 to 26.

29. A non-transitory computer-readable medium having stored thereon computer-executable instructions for performing the method of any one of claims 1-26.