WO2021093191A1

WO2021093191A1 - Methods, apparatus and systems for transmission power configuration in uplink transmissions

Info

Publication number: WO2021093191A1
Application number: PCT/CN2020/074591
Authority: WO
Inventors: Chenchen Zhang; Peng Hao; Xingguang WEI
Original assignee: Zte Corporation
Priority date: 2020-02-10
Filing date: 2020-02-10
Publication date: 2021-05-20
Also published as: CN115152280A

Abstract

Methods, apparatus and systems for transmission power configuration in uplink transmissions are disclosed. In one embodiment, a method performed by a wireless communication device is disclosed. The method comprises: determining a first maximum transmission power for a first uplink transmission in a first cell; determining a second maximum transmission power for a second uplink transmission in the first cell; and performing both the first uplink transmission and the second uplink transmission based on at least one of the first maximum transmission power and the second maximum transmission power.

Description

METHODS, APPARATUS AND SYSTEMS FOR TRANSMISSION POWER CONFIGURATION IN UPLINK TRANSMISSIONS

TECHNICAL FIELD

The disclosure relates generally to wireless communications and, more particularly, to methods, apparatus and systems for transmission power configuration in uplink transmissions in a wireless communication.

BACKGROUND

In a fifth-generation (5G) new radio (NR) network, carrier aggregation (CA) is proposed to achieve high reliability and high data rate. With CA, two or more component carriers (CCs) are aggregated in order to support wider transmission bandwidths. In a dual connectivity (DC) or CA scenario, a terminal establishes a dual-connection or multi-connection with two or more cell groups (CGs) . In this case, the schedulers in different CGs may or may not timely interact with each other. If the schedulers do not interact in time, the schedulers of different CGs will perform scheduling independently, such that the terminal may need to send, on multiple carriers of multiple CGs, uplink transmissions with time domain resources that are completely or partially overlapping. If the schedulers can interact in time, the terminal can comprehensively determine the transmission power for each uplink transmission, in consideration of the transmission requirements of different CCs of different CGs. For example, based on some priority rules, a terminal may preferentially satisfy power requirements of high-priority uplink transmissions, and then apply the remaining power to satisfy power requirements of low-priority uplink transmissions.

An existing NR protocol provides priority rules with respect to different types of channels or signals on multiple CCs in a CG under a CA scenario. According to a first priority rule, when the transmission power of a terminal is limited, the terminal preferentially ensures the transmission powers of the high-priority channels or signals. According to a second priority rule, for terminals with dynamic power sharing capability and limited transmission power in the CG scenario, an uplink transmission channel or signal sent on a master cell group (MCG) has a higher priority than that sent on a secondary cell group (SCG) . As such, a terminal should first allocate transmission power to uplink transmission channel or signal in the MCG. In some scenarios, if the terminal preferentially allocates power to the uplink transmission channel or signal in the MCG based on the second priority rule, it cannot ensure the allocated power of the high-priority channel or signal in the SCG, which is inconsistent with the requirements of the first priority rule.

Thus, existing systems and methods for transmission power configuration in uplink transmissions in a wireless communication are not entirely satisfactory.

SUMMARY OF THE INVENTION

The exemplary embodiments disclosed herein are directed to solving the issues relating to one or more of the problems presented in the prior art, as well as providing additional features that will become readily apparent by reference to the following detailed description when taken in conjunction with the accompany drawings. In accordance with various embodiments, exemplary systems, methods, devices and computer program products are disclosed herein. It is understood, however, that these embodiments are presented by way of example and not limitation, and it will be apparent to those of ordinary skill in the art who read the present disclosure that various modifications to the disclosed embodiments can be made 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: determining a first maximum transmission power for a first uplink transmission in a first cell; determining a second maximum transmission power for a second uplink transmission in the first cell; and performing both the first uplink transmission and the second uplink transmission based on at least one of the first maximum transmission power and the second maximum transmission power.

In another embodiment, a method performed by a wireless communication device is disclosed. The method comprises: receiving a first downlink control information (DCI) scheduling a first uplink transmission to be transmitted in a first cell group associated with the wireless communication device; receiving a second DCI scheduling a second uplink transmission to be transmitted in the first cell group; and receiving a third DCI scheduling a third uplink transmission to be transmitted in a second cell group associated with the wireless communication device. Neither or each of the first uplink transmission and the second uplink transmission is scheduled on a time-domain transmission resource overlapping with a time-domain transmission resource of the third uplink transmission.

In yet another embodiment, a method performed by a wireless communication device is disclosed. The method comprises: receiving a first downlink control information (DCI) scheduling a first uplink transmission to be transmitted in a first cell group associated with the wireless communication device; receiving a second DCI scheduling a second uplink transmission to be transmitted in the first cell group; and receiving a third DCI scheduling a third uplink transmission to be transmitted in a second cell group associated with the wireless communication device. At least two of the first uplink transmission, the second uplink transmission, and the third uplink transmission are scheduled on non-overlapping time-domain transmission resources.

In a different embodiment, a method performed by a wireless communication device is disclosed. The method comprises: determining a maximum transmission power for uplink transmissions of the wireless communication device on a time unit in a first cell group for a dual connection or multi-connection of the wireless communication device. The maximum transmission power is determined based on a semi-static frame structure configuration of a second cell group for the dual connection or multi-connection of the wireless communication device.

In a further embodiment, a method performed by a wireless communication node is disclosed. The method comprises: scheduling, for a wireless communication device, a first uplink transmission in a first cell and a second uplink transmission in the first cell; and receiving, from the wireless communication device, both the first uplink transmission and the second uplink transmission that are transmitted based on at least one of: a first maximum transmission power determined for the first uplink transmission, and a second maximum transmission power determined for the second uplink transmission.

In another embodiment, a method performed by a wireless communication node is disclosed. The method comprises: transmitting, to a wireless communication device, a first downlink control information (DCI) scheduling a first uplink transmission to be transmitted in a first cell group associated with the wireless communication device; and transmitting, to the wireless communication device, a second DCI scheduling a second uplink transmission to be transmitted in the first cell group. The wireless communication device receives a third DCI scheduling a third uplink transmission to be transmitted in a second cell group associated with the wireless communication device. Neither or each of the first uplink transmission and the second uplink transmission is scheduled on a time-domain transmission resource overlapping with a time-domain transmission resource of the third uplink transmission.

In yet another embodiment, a method performed by a wireless communication node is disclosed. The method comprises: transmitting, to a wireless communication device, a first downlink control information (DCI) scheduling a first uplink transmission to be transmitted in a first cell group associated with the wireless communication device; and transmitting, to the wireless communication device, a second DCI scheduling a second uplink transmission to be transmitted in the first cell group. The wireless communication device receives a third DCI scheduling a third uplink transmission to be transmitted in a second cell group associated with the wireless communication device. At least two of the first uplink transmission, the second uplink transmission, and the third uplink transmission are scheduled on non-overlapping time-domain transmission resources.

In still another embodiment, a method performed by a wireless communication node is disclosed. The method comprises: determining, for a wireless communication device, a semi-static frame structure configuration in a first cell group for a dual connection or multi-connection of the wireless communication device. A maximum transmission power is determined, based on the semi-static frame structure configuration, for uplink transmissions of the wireless communication device on a time unit in a second cell group for the dual connection or multi-connection of the wireless communication device.

In a different embodiment, a wireless communications apparatus is disclosed. The wireless communications apparatus comprises a processor and a memory, wherein the processor is configured to read code from the memory and implement a method recited in some embodiment. In yet another embodiment, a computer program product is disclosed. The computer program product comprises a computer-readable program medium code stored thereupon, the code, when executed by a processor, causing the processor to implement a method in some embodiment.

The above and other aspects and their implementations are described in greater detail in the drawings, the descriptions, and the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

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

FIG. 1 illustrates an exemplary 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 chart for a method performed by a BS, 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 chart for a method performed by a UE, in accordance with some embodiments of the present disclosure.

FIG. 6 illustrates an exemplary situation in which a UE has scheduled uplink transmissions with overlapping time-domain transmission resources, in accordance with some embodiments of the present disclosure.

FIG. 7 illustrates exemplary slot structures in different cell groups, in accordance with some embodiments of the present disclosure.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Various exemplary embodiments of the present disclosure are described below with reference to the accompanying figures to enable a person of ordinary skill in the art to make and use the present disclosure. As would be apparent to those of ordinary skill in the art, after reading the present disclosure, various changes or modifications to the examples described herein can be made without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the exemplary embodiments and applications described and illustrated herein. Additionally, the specific order and/or hierarchy of steps in the methods disclosed herein are merely exemplary approaches. Based upon design preferences, the specific order or hierarchy of steps of the disclosed methods or processes can be re-arranged while remaining within the scope of the present disclosure. Thus, those of ordinary skill in the art will understand that the methods and techniques disclosed herein present various steps or acts in a sample order, and the present disclosure is not limited to the specific order or hierarchy presented unless expressly stated otherwise.

A typical wireless communication network includes one or more base stations (typically known as a “BS” ) that each provides a geographical radio coverage, and one or more wireless user equipment devices (typically known as a “UE” ) that can transmit and receive data within the radio coverage. In a 5G NR network, dual connectivity (DC) is proposed to allow a UE with multiple transceivers to simultaneously transmit data to or receive data from at least two BSs, for example a Master gNodeB (MgNB or MN) and a secondary gNodeB (SgNB or SN) . The UE can connect with a Master Cell Group (MCG) associated with the MN and a Secondary Cell Group (SCG) associated with the SN simultaneously so as to improve data rate, reduce latency, and improve reliability.

When a UE needs to send multiple uplink transmission channels or signals with completely or partially overlapping time domain resources, the available total uplink transmission power of the UE may not satisfy the requirements of all uplink transmission channels or signals. In this case, based on some priority rule, the UE needs to allocate the limited uplink transmission power to uplink transmission channels or signals with higher priority. For various uplink transmission channels or signals within a CG (MCG or SCG) under a CA scenario, the order of priority is as follows: physical random access channel (PRACH) > physical uplink control channel (PUCCH) with hybrid automatic repeat request -acknowledgement (HARQ-ACK) /scheduling request (SR) = physical uplink shared channel (PUSCH) with HARQ-ACK > PUCCH with channel state information (CSI) = PUSCH with CSI > PUSCH without uplink control information (UCI) > aperiodic sounding reference signal (A-SRS) > periodic SRS (P-SRS) /semi-persistent SRS (SP-SRS) . For a same uplink transmission channel or signal in a CG (MCG or SCG) , its priority is higher when being transmitted on a primary cell compared to a situation when being transmitted on a secondary cell. According to another priority rule, the uplink transmission channels or signals in different CGs in the DC scenario have a priority order as follows: uplink transmission channels or signals on a MCG > uplink transmission channels or signals on a SCG.

The uplink transmissions of different CGs may be different in terms of: Numerology, transmission duration, transmission starting symbol, and an interval between an uplink transmission and the physical downlink control channel (PDCCH) scheduling or activating the uplink transmission. After receiving the PDCCH scheduling or activating the uplink transmission, the UE may wait for a period of time to determine the transmission power of the uplink transmission, instead of making an immediate decision about the transmission power of the uplink transmission. As such, the UE can comprehensively consider the PDCCHs received on multiple CGs to decide the power allocation among different uplink transmissions in a more reasonable manner. In the present teaching, the latest time for the UE to determine the transmission power of the uplink transmission can be called a cut-off time of the uplink transmission.

According to a look-ahead mechanism, the terminal decides the transmission power of a certain uplink transmission no later than a cut-off time. According to various embodiments of the present teaching, from the terminal’s awareness of the uplink transmission demand to the cut-off time, the terminal can comprehensively determine the transmission power of the target uplink transmission by combining the uplink transmission requirements learned on other CGs or other CCs.

The methods disclosed in the present teaching can be implemented in a wireless communication network, where a BS and a UE can communicate with each other via a communication link, e.g., via a downlink radio frame from the BS to the UE or via an uplink radio frame from the UE to the BS. In various embodiments, a BS in the present disclosure can be referred to as a network side and can 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) , etc.; while a UE in the present disclosure can be referred to as a terminal and can include, or be implemented as, a mobile station (MS) , a station (STA) , etc. A BS and a UE may be described herein as non-limiting examples of “wireless communication nodes, ” and “wireless communication devices” respectively, which can practice the methods disclosed herein and may be capable of wireless and/or wired communications, in accordance with various embodiments of the present disclosure.

FIG. 1 illustrates an exemplary communication network 100 in which techniques disclosed herein may be implemented, in accordance with an embodiment of the present disclosure. As shown in FIG. 1, the exemplary communication network 100 includes a first base station (Master BS) 110 and a second base station (Secondary BS) 120. The Master BS 110 is in a master cell group (MCG) 101 which also includes a plurality of UEs, UE 1 111 …UE 2 112, where the Master BS 110 can communicate with these UEs according to wireless protocols. Similarly, the Secondary BS 120 is in a secondary cell group (SCG) 102 which also includes a plurality of UEs, UE 2 112, UE 3 123 …UE 4 124, where the Secondary BS 120 can communicate with these UEs according to wireless protocols. The UE 2 112 is in both the MCG 101 and the SCG 102. As such, a dual connectivity (DC) is established between the UE 2 112 and the both base stations (Master BS 110 and Secondary BS 120) at the same time. The two cell groups (and the base stations) are named master and secondary with respect to the UE 2 112. If there is an additional UE located in both the two cell groups, it is possible that the master and secondary roles of the two cell groups (and the base stations) are swapped compared to what is shown in FIG. 1.

Each UE may perform an uplink transmission to its associated BS with a transmission power determined before the uplink transmission. When the UE determines or applies its transmission power for one uplink transmission, it may consider other uplink transmissions that have overlapping time-domain resources with the uplink transmission. This is especially practical for a DC established UE, e.g. the UE 2 112. Because the Master BS 110 and the Secondary BS 120 may independently and respectively schedule two uplink transmissions for the UE 2 112, the two uplink transmissions could be scheduled with overlapping time and/or frequency resources.

FIG. 2 illustrates a block diagram of a base station (BS) 200, in accordance with some embodiments of the present disclosure. The BS 200 is an example of a device that can be configured to implement the various methods described herein. As shown in FIG. 2, the BS 200 includes a housing 240 containing a system clock 202, a processor 204, a memory 206, a transceiver 210 comprising a transmitter 212 and receiver 214, a power module 208, an uplink transmission scheduler 220, a downlink control information generator 222, a frame structure configurator 224, and an uplink data analyzer 226.

In this embodiment, the system clock 202 provides the timing signals to the processor 204 for controlling the timing of all operations of the BS 200. The processor 204 controls the general operation of the BS 200 and can include one or more processing circuits or modules such as a central processing unit (CPU) and/or any combination of general-purpose microprocessors, microcontrollers, digital signal processors (DSPs) , field programmable gate array (FPGAs) , programmable logic devices (PLDs) , controllers, state machines, gated logic, discrete hardware components, dedicated hardware finite state machines, or any other suitable circuits, devices and/or structures that can perform calculations or other manipulations of data.

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

The transceiver 210, which includes the transmitter 212 and receiver 214, allows the BS 200 to transmit and receive data to and 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, the BS 200 includes (not shown) multiple transmitters, multiple receivers, and multiple transceivers. In one embodiment, the antenna 250 is replaced with a multi-antenna array 250 that can form a plurality of beams each of which points in a distinct direction. The transmitter 212 can be configured to wirelessly transmit packets having different packet types or functions, such packets being generated by the processor 204. Similarly, the receiver 214 is configured to receive packets having different packet types or functions, and the processor 204 is configured to process packets of a plurality of different packet types. For example, the processor 204 can be configured to determine the type of packet and to process the packet and/or fields of the packet accordingly.

In a wireless communication, the uplink transmission scheduler 220 of the BS 200 may schedule, for a UE, multiple uplink transmissions in a cell, e.g. a first uplink transmission and a second uplink transmission in a first cell. In one embodiment, the first uplink transmission and the second uplink transmission are scheduled on overlapping time-domain transmission resources.

The uplink data analyzer 226 in this example may receive, via the receiver 214 and from the UE, both the first uplink transmission and the second uplink transmission. In one embodiment, the two uplink transmissions are transmitted based on at least one of: a first maximum transmission power determined for the first uplink transmission, and a second maximum transmission power determined for the second uplink transmission.

In one embodiment, the first uplink transmission and the second uplink transmission are received with a maximum transmission power that is equal to a minimum of the first maximum transmission power and the second maximum transmission power. In another embodiment, the first uplink transmission and the second uplink transmission are received with a maximum transmission power that is equal to the second maximum transmission power. The second maximum transmission power may be determined based at least partially on a transmission power for a third uplink transmission in a second cell.

In one embodiment, the first cell is in a first cell group for a dual connection or multi-connection of the UE; and the second cell is in a second cell group for the dual connection or multi-connection of the UE. In one embodiment, the first cell group is a secondary cell group; and the second cell group is a master cell group.

In one embodiment, the first maximum transmission power is equal to a total transmission power supported by the UE. In one embodiment, the second maximum transmission power is determined based on: a transmission power for a third uplink transmission in a second cell; a total transmission power supported by the UE; a maximum transmission power pre-configured for an uplink transmission of the UE; and a minimum function. In one embodiment, the third uplink transmission and the second uplink transmission are scheduled on overlapping time-domain transmission resources.

In one embodiment, the first maximum transmission power is determined not later than a first cut-off time associated with the first uplink transmission; and the second maximum transmission power is determined not later than a second cut-off time associated with the second uplink transmission, wherein the first cut-off time is before the second cut-off time. The uplink data analyzer 226 may also analyze the uplink data of the received uplink transmissions.

The downlink control information generator 222 in this example can generate and transmit, via the transmitter 212, DCI including at least one symbol via physical downlink control channel (PDCCH) to a UE for activating or scheduling uplink transmissions. In one embodiment, the downlink control information generator 222 may transmit to a UE a first DCI scheduling a first uplink transmission to be transmitted in a first cell group associated with the UE; and transmit to the UE a second DCI scheduling a second uplink transmission to be transmitted in the first cell group. The UE may receive a third DCI scheduling a third uplink transmission to be transmitted in a second cell group associated with the UE. In one embodiment, neither or each of the first uplink transmission and the second uplink transmission is scheduled on a time-domain transmission resource overlapping with a time-domain transmission resource of the third uplink transmission. The UE does not expect to be scheduled for other overlapping cases between the three uplink transmissions by the BS, e.g. the gNB. In one embodiment, the second DCI is received by the UE not earlier than a cut-off time associated with the first uplink transmission. In another embodiment, the second DCI is received by the UE not earlier than a cut-off time associated with the third uplink transmission.

The downlink control information generator 222 may generate the DCI based on a request from the uplink transmission scheduler 220. In one embodiment, an end symbol of a time-domain transmission resource of the second uplink transmission is scheduled to be no later than an end symbol of a time-domain transmission resource of the first uplink transmission.

In one embodiment, at least two of the first uplink transmission, the second uplink transmission, and the third uplink transmission are scheduled on non-overlapping time-domain transmission resources. In one example, the first uplink transmission and the second uplink transmission are scheduled on non-overlapping time-domain transmission resources. The UE does not expect to be scheduled on overlapping time-domain transmission resources between the first uplink transmission and the second uplink transmission. In another example, the third uplink transmission and the second uplink transmission are scheduled on non-overlapping time-domain transmission resources. The UE does not expect to be scheduled on overlapping time-domain transmission resources between the second uplink transmission and the third uplink transmission.

The frame structure configurator 224 in this example may determine, for a UE, a semi-static frame structure configuration in a first cell group for a dual connection or multi-connection of the UE. In one embodiment, the UE determines, based on the semi-static frame structure configuration, a maximum transmission power for uplink transmissions of the UE on a time unit in a second cell group for the dual connection or multi-connection of the UE. In one embodiment, the time unit has a length equal to that of a longest time unit on all component carriers in the second cell group. For example, the time unit can be a frame, a sub-frame, a slot, or a sub-slot.

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

The various modules discussed above are coupled together by a bus system 230. The bus system 230 can include a data bus and, for example, a power bus, a control signal bus, and/or a status signal bus in addition to the data bus. It is understood that the modules of the BS 200 can be operatively coupled to one another using any suitable techniques and mediums.

Although a number of separate modules or components are illustrated in FIG. 2, persons of ordinary skill in the art will understand that one or more of the modules can be combined or commonly implemented. For example, the processor 204 can implement not only the functionality described above with respect to the processor 204, but also implement the functionality described above with respect to the uplink transmission scheduler 220. Conversely, each of the modules illustrated in FIG. 2 can be implemented using a plurality of separate components or elements.

FIG. 3 illustrates a flow chart for a method 300 performed by a BS, e.g. the BS 200 in FIG. 2, in accordance with some embodiments of the present disclosure. At operation 302, the BS generates and transmits, to a UE, a first downlink control information (DCI) scheduling a first uplink transmission to be transmitted in a first cell associated with the UE. At operation 304, the BS generates and transmits, to the UE, a second DCI scheduling a second uplink transmission to be transmitted in the first cell. At operation 306, the BS receives, from the UE, both the first and second uplink transmissions. The two uplink transmissions are transmitted based on at least one of: a first maximum transmission power determined for the first uplink transmission, and a second maximum transmission power determined for the second uplink transmission. In one embodiment, the UE receives a third DCI scheduling a third uplink transmission to be transmitted in a second cell associated with the UE, and determines the second maximum transmission power in view of the third uplink transmission. The order of the steps shown in FIG. 3 may be changed 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. The UE 400 is an example of a device that can be configured to implement the various methods described herein. As shown in FIG. 4, the UE 400 includes a housing 440 containing a system clock 402, a processor 404, a memory 406, a transceiver 410 comprising a transmitter 412 and a receiver 414, a power module 408, a transmission power determiner 420, a time threshold determiner 422, a downlink control information analyzer 424, and an uplink data generator 426.

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

The transmission power determiner 420 in this example may determine or apply a transmission power for an uplink transmission of the UE 400 based at least partially on a time threshold associated with the uplink transmission. The time threshold indicates a latest time the transmission power should be determined or applied. The UE 400 may perform the uplink transmission based on the transmission power to a BS. In one embodiment, the transmission power determiner 420 determines a first maximum transmission power for a first uplink transmission in a first cell; and determines a second maximum transmission power for a second uplink transmission in the first cell.

The transmission power determiner 420 may send the determined transmission powers to the uplink data generator 426. The uplink data generator 426 in this example may generate uplink data and perform uplink transmissions based on the transmission powers. For example, the uplink data generator 426 may perform both the first uplink transmission and the second uplink transmission based on at least one of the first maximum transmission power and the second maximum transmission power. In one embodiment, the first uplink transmission and the second uplink transmission are performed with a maximum transmission power that is equal to a minimum of the first maximum transmission power and the second maximum transmission power. In another embodiment, the first uplink transmission and the second uplink transmission are performed with a maximum transmission power that is equal to the second maximum transmission power.

In one embodiment, the transmission power determiner 420 may determine the second maximum transmission power based at least partially on a transmission power for a third uplink transmission in a second cell. In one embodiment, the first cell is in a first cell group for a dual connection or multi-connection of the UE 400; and the second cell is in a second cell group for the dual connection or multi-connection of the UE 400. In one embodiment, the first cell group is a secondary cell group; and the second cell group is a master cell group.

In one embodiment, the first maximum transmission power is equal to a total transmission power supported by the UE 400. In another embodiment, the second maximum transmission power is determined based on: a transmission power for a third uplink transmission in a second cell; a total transmission power supported by the UE 400; a maximum transmission power pre-configured for an uplink transmission of the UE 400; and a minimum function.

The time threshold determiner 422 in this example may determine the time threshold, a cut-off time, based on a semi-static configuration by the BS or based on a system pre-definition. In one embodiment, the time threshold determiner 422 can determine that: the first maximum transmission power is determined not later than a first cut-off time associated with the first uplink transmission; and the second maximum transmission power is determined not later than a second cut-off time associated with the second uplink transmission. In one embodiment, the first cut-off time is before the second cut-off time.

The downlink control information analyzer 424 in this example may receive, via the receiver 414 from the BS, DCI including at least one symbol via physical downlink control channel (PDCCH) for activating or scheduling the uplink transmission. The downlink control information analyzer 424 may analyze the DCI and send the analyzed DCI to the transmission power determiner 420 for determining or applying the transmission power based on both the time threshold and an ending time for receiving the at least one symbol. In one embodiment, based on the analysis of the DCI, the downlink control information analyzer 424 may determine that: the first uplink transmission and the second uplink transmission are scheduled on overlapping time-domain transmission resources. In another embodiment, based on the analysis of the DCI, the downlink control information analyzer 424 may determine that: the third uplink transmission and the second uplink transmission are scheduled on overlapping time-domain transmission resources.

In one embodiment, the downlink control information analyzer 424 receives a first DCI scheduling a first uplink transmission to be transmitted in a first cell group associated with the UE 400; receives a second DCI scheduling a second uplink transmission to be transmitted in the first cell group; and receives a third DCI scheduling a third uplink transmission to be transmitted in a second cell group associated with the UE 400. In one embodiment, the second DCI is received not earlier than a cut-off time associated with the first uplink transmission. In another embodiment, the second DCI is received not earlier than a cut-off time associated with the third uplink transmission.

In one embodiment, neither of the first uplink transmission and the second uplink transmission is scheduled on a time-domain transmission resource overlapping with a time-domain transmission resource of the third uplink transmission. In another embodiment, each of the first uplink transmission and the second uplink transmission is scheduled on a time-domain transmission resource overlapping with a time-domain transmission resource of the third uplink transmission. If the time domain resources of the first transmission and the third transmission overlap, the UE 400 does not expect to be scheduled such that the time domain resources of the second transmission and the third transmission do not overlap. If the time domain resources of the first transmission and the third transmission do not overlap, the UE 400 does not expect to be scheduled such that the time domain resources of the second transmission and the third transmission overlap. In one embodiment, an end symbol of a time-domain transmission resource of the second uplink transmission is scheduled to be no later than an end symbol of a time-domain transmission resource of the first uplink transmission. As such, the UE 400 does not expect the time domain end symbol of the second transmission scheduled to be later than the time domain end symbol of the first transmission.

In one embodiment, at least two of the first uplink transmission, the second uplink transmission, and the third uplink transmission are scheduled on non-overlapping time-domain transmission resources. In one example, the first uplink transmission and the second uplink transmission are scheduled on non-overlapping time-domain transmission resources. In another example, the third uplink transmission and the second uplink transmission are scheduled on non-overlapping time-domain transmission resources.

In one embodiment, the transmission power determiner 420 may determine a maximum transmission power for uplink transmissions of the UE 400 on a time unit in a first cell group for a dual connection or multi-connection of the UE 400. The maximum transmission power may be determined based on a semi-static frame structure configuration of a second cell group for the dual connection or multi-connection of the UE 400. In one embodiment, the time unit has a length equal to that of a longest time unit on all component carriers in the first cell group. For example, the time unit can be a frame, a sub-frame, a slot, or a sub-slot.

The various modules discussed above are coupled together by a bus system 430. The bus system 430 can include a data bus and, for example, a power bus, a control signal bus, and/or a status signal bus in addition to the data bus. It is understood that the modules of the UE 400 can be operatively coupled to one another using any suitable techniques and mediums.

Although a number of separate modules or components are illustrated in FIG. 4, persons of ordinary skill in the art will understand that one or more of the modules can be combined or commonly implemented. For example, the processor 404 can implement not only the functionality described above with respect to the processor 404, but also implement the functionality described above with respect to the transmission power determiner 420. Conversely, each of the modules illustrated in FIG. 4 can be implemented using a plurality of separate components or elements.

FIG. 5 illustrates a flow chart for a method 500 performed by a UE, e.g. the UE 400 in FIG. 4, in accordance with some embodiments of the present disclosure. At operation 502, the UE receives a first downlink control information (DCI) scheduling a first uplink transmission to be transmitted in a first cell associated with the UE. The UE determines at operation 504 a first maximum transmission power for the first uplink transmission. At operation 506, the UE receives a second DCI scheduling a second uplink transmission to be transmitted in the first cell associated with the UE. At operation 508, the UE determines a second maximum transmission power for the second uplink transmission in view of a third uplink transmission in a second cell. At operation 510, the UE performs both the first and second uplink transmissions based on at least one of the first and second maximum transmission powers. The order of the steps shown in FIG. 5 may be changed according to different embodiments of the present disclosure.

Different embodiments of the present disclosure will now be described in detail hereinafter. It is noted that the 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, when two power upper limits or two maximum transmission powers are calculated in a same CG within a same time period, the lower power upper limit will be used as the final transmission power upper limit. FIG. 6 illustrates an exemplary situation in which a UE has scheduled uplink transmissions with overlapping time-domain transmission resources, in accordance with some embodiments of the present disclosure.

As shown in FIG. 6, the UE first receives the DCI 612 of the uplink transmission 1 616 scheduled on a first component carrier (CC) 610 of the SCG. As such, the UE needs to determine the transmission power for the uplink transmission 1 616, before cut-off time t1 614, which is the latest power decision time corresponding to the uplink transmission 1 616.

According to the requirement that the priority of the uplink transmissions on the MCG is higher than those on the SCG, the UE needs to allocate power for the uplink transmission on the MCG first. As shown in FIG. 6, by the cut-off time t1 614, the UE has not received any scheduling DCI to schedule any uplink transmission on the MCG, and there is no semi-statically configured uplink transmission to be transmitted on the MCG. Therefore, the UE determines that: within the duration of uplink transmission 1 616, the maximum transmission power on the SCG can be P _total, which is the total transmission power supported by the UE.

The UE then receives the DCI 622 scheduling the uplink transmission 2 626 on a second CC 620 of the SCG. For the uplink transmission 2 626 on the SCG, the UE needs to determine the transmission power for the uplink transmission 2 626 no later than the cut-off time t2 624. As shown in FIG. 6, the UE receives the DCI 632 scheduling the uplink transmission 3 636 on a CC 630 of the MCG, before the cut-off time t2 624. As such, the UE knows that there will be an uplink transmission 3 636 scheduled on a time resource overlapping with the time resource for the uplink transmission 2 626, as shown in FIG. 6. Therefore, the UE determines that: within the duration of uplink transmission 2 626, the maximum transmission power on the SCG can be min (P _SCG, P _total-P _MCG Used) , where P _SCG is the maximum transmission power configured for uplink transmissions on the SCG, P _MCG Used is the uplink transmission power that has been allocated for the MCG. In one embodiment, the UE determines the transmission power for the uplink transmission 3 636 by the cut-off time t2 624, rather than by the cut-off time t3 634.

Therefore, there are two maximum transmission powers calculated for the SCG. Because the uplink transmission 1 616 and the uplink transmission 2 626 are scheduled on overlapping time domain resources, the terminal or UE should use a lower one of the two maximum transmission powers as a transmission power cap for all uplink transmissions that completely or partially overlap on time domain resources. That is, the terminal will use min(P _SCG, P _total-P _MCG Used) as a maximum transmission power for transmitting both the uplink transmission 1 616 and the uplink transmission 2 626.

As shown in FIG. 6, the uplink transmission 1 616 and the uplink transmission 2 626 have an overlapping portion T. During the overlapping portion T, the UE can perform the uplink transmission 1 616 and the uplink transmission 2 626 with a total transmission power up to min(P _SCG, P _total-P _MCG Used) . The UE can use a transmission power up to min(P _SCG, P _total-P _MCG Used) for transmitting the non-overlapping portion (the portion outside the overlapping portion T) of each of the uplink transmission 1 616 and the uplink transmission 2 626. In another embodiment, the UE receives the DCI 622 before the cut-off time t1 614, and may determine the transmission power for the uplink transmission 1 616 in view of the uplink transmission 2 626. According to various embodiments, each of the uplink transmission 1 616, the uplink transmission 2 626, and the uplink transmission 3 636 may be one of: PRACH, PUCCH with HARQ-ACK, SR, PUSCH with HARQ-ACK, PUCCH with CSI, PUSCH with CSI, PUSCH without UCI, A-SRS, P-SRS, or SP-SRS.

In a second embodiment, the maximum transmission power on the SCG is determined based on whether there is at least one uplink transmission on the SCG overlapping with an uplink transmission on the MCG. As shown in FIG. 6, the UE first receives the DCI 612 of the uplink transmission 1 616 scheduled on a first CC 610 of the SCG, and then receives the DCI 622 scheduling the uplink transmission 2 626 on a second CC 620 of the SCG. The UE also receives the DCI 632 scheduling the uplink transmission 3 636 on a CC 630 of the MCG, before the cut-off time t2 624. Although the uplink transmission 3 636 on the MCG has a time domain resource only overlapping with the time domain resource of the uplink transmission 2 626 on the SCG, the uplink transmission 1 616 and the uplink transmission 2 626 on the SCG have overlapping time domain resources.

As such, considering the uplink transmission 1 616 and the uplink transmission 2 626 as an aggregated uplink transmission scheduled on the SCG, the aggregated uplink transmission on the SCG and the uplink transmission 3 636 on the MCG have overlapping time domain resources. As such, the UE determines that: within the duration of the aggregated uplink transmission, i.e. within the duration from the beginning of the uplink transmission 1 616 to the end of the uplink transmission 2 626, the maximum transmission power on the SCG can be min(P _SCG, P _total-P _MCG Used) , where P _SCG is the maximum transmission power configured for uplink transmissions on the SCG, P _MCG Used is the uplink transmission power that has been allocated for the MCG. As such, the terminal will use min (P _SCG, P _total-P _MCG Used) as a maximum transmission power for transmitting both the uplink transmission 1 616 and the uplink transmission 2 626.

In a third embodiment, when there are multiple uplink transmissions scheduled on overlapping time domain resources on the SCG, they are consistent with respect to whether overlapping with an uplink transmission on the MCG. That is, either all of the multiple uplink transmissions or none of the multiple uplink transmissions have overlapping time domain resources with the uplink transmission on the MCG. It is better for a base station to avoid the situation as shown in FIG. 6, when it performs scheduling. For multiple uplink transmissions having overlapping time domain resources on the SCG, they should be scheduled to be consistent in term of whether they have an overlapping time domain resource with one or more uplink transmissions on the MCG in this embodiment.

In one example, if the first scheduled uplink transmission 1 616 on the SCG in FIG. 6 has an overlapping time domain resource with the uplink transmission 3 636 on the MCG, then when the base station schedules the uplink transmission 2 626 on the SCG having an overlapping time domain resource with the uplink transmission 1 616, the base station will ensure that the uplink transmission 2 626 also overlaps with the uplink transmission 3 636 on the time domain resource.

In another example, if the first scheduled uplink transmission 1 616 on the SCG in FIG. 6 does not have an overlapping time domain resource with the uplink transmission 3 636 on the MCG, then when the base station schedules the uplink transmission 2 626 on the SCG having an overlapping time domain resource with the uplink transmission 1 616, the base station will ensure that the uplink transmission 2 626 does not overlap with the uplink transmission 3 636 on the time domain resource either. The UE does not expect to be scheduled such that the time domain resources of the uplink transmission 2 626 and the uplink transmission 3 636 overlap with each other.

In a fourth embodiment, the time domain end symbol of the uplink transmission 2 626 is scheduled to be no later than the time domain end symbol of the uplink transmission 1 616. It is better for a base station to avoid the situation as shown in FIG. 6, when it performs scheduling. For multiple uplink transmissions having overlapping time domain resources on the SCG, they should be scheduled to be consistent in term of whether they have an overlapping time domain resource with one or more uplink transmissions on the MCG. In one example similar to FIG. 6, the DCI 622 scheduling or activating the uplink transmission 2 626 is received after the DCI 612 scheduling or activating the uplink transmission 1 616 is received. In this case, if the uplink transmission 1 616 does not have an overlapping time domain resource with that of an uplink transmission on the MCG, then when the base station schedules the uplink transmission 2 626, the base station will ensure that the time domain resource end symbol of the uplink transmission 2 is not later than the time domain resource end symbol of the uplink transmission 1 in this embodiment. This can ensure that: the uplink transmission 1 and the uplink transmission 2 are consistent, with respect to whether they have an overlapping time domain resource with one or more uplink transmissions on the MCG.

In a fifth embodiment, after the cut-off time t1 614, no other uplink transmission on the SCG is scheduled to have an overlapping time domain resource with the target uplink transmission, i.e. the uplink transmission 1 616. It is better for a base station to avoid the situation as shown in FIG. 6, when it performs scheduling. The base station determines the maximum transmission power of the uplink transmission 1 616 on the SCG by the cut-off time t1 614 at the latest. After the cut-off time t1 614, in this embodiment, the UE does not expect the base station to schedule on the SCG any uplink transmission that has overlapping time domain resources with the uplink transmission 1. If the base station schedules an uplink transmission 2 on the SCG, the base station will ensure that the uplink transmission 2 and the uplink transmission 1 do not have overlapping time domain resources.

In a sixth embodiment, after the cut-off time t1 614, no other uplink transmission on the SCG is scheduled to have an overlapping time domain resource with any uplink transmission on the MCG. It is better for a base station to avoid the situation as shown in FIG. 6, when it performs scheduling. The base station determines the maximum transmission power of the uplink transmission 1 616 on the SCG by the cut-off time t1 614 at the latest. After the cut-off time t1 614, in this embodiment, the UE does not expect the base station to schedule on the SCG any uplink transmission that has overlapping time domain resources with any uplink transmission on the MCG. If the base station schedules an uplink transmission 2 on the SCG, in this embodiment, the base station will ensure that the uplink transmission 2 do not have an overlapping time domain resource with any uplink transmission on the MCG, including e.g. the uplink transmission 3 636 on the MCG.

In a seventh embodiment, for terminals without dynamic power sharing capabilities under a DC scenario, a base station can configure the terminals to work under non-dynamic power sharing or semi-static power sharing. For such terminals, the base station will configure a maximum transmission power P _MCG in the MCG, and configure a maximum transmission power P _SCG in the SCG. In addition, the terminal may determine another maximum transmission power P’ _MCG for MCG, and another maximum transmission power P’ _SCG for SCG, based on configuration parameters in RAN4 or a higher layer signaling from the base station.

The terminal needs to determine, for MCG, when to use P _MCG as the maximum transmission power, and when to use P’ _MCG as the maximum transmission power. The terminal also needs to determine, for SCG, when to use P _SCG as the maximum transmission power, and when to use P’ _SCG as the maximum transmission power.

When a terminal determines a maximum transmission power on a certain time unit on the MCG, the terminal can determine the maximum transmission power based on a semi-statically configured frame structure on the SCG. For example, when a semi-static frame structure configuration on the SCG indicates that there is no “Uplink” or “Flexible” on the time unit, the terminal can determine that the maximum transmission power on the same time unit of the MCG is P’ _MCG. Otherwise, the terminal determines that the maximum transmission power on the same time unit of the MCG is P _MCG. The MCG can contain a plurality of CCs, and the sub-carrier spacing (SCS) may be different for different CCs. As such, the time unit may be a time unit whose length is determined based on the Numerology with the smallest SCS of all CCs on the MCG. That is, the time unit has a length equal to that of a longest time unit, e.g. a longest time slot, on all CCs on the MCG.

FIG. 7 illustrates exemplary slot structures in different cell groups, in accordance with some embodiments of the present disclosure. As shown in FIG. 7, for MCG, the slot 715 on component carrier 0 (CC0) is longer than the slot 725 on component carrier 1 (CC1) . As such, the length of the slot 715 is used as a time unit to determine a maximum transmission power of a certain time unit on the MCG.

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 by way of limitation. Likewise, the various diagrams may depict an example architectural or configuration, which are provided to enable persons of ordinary skill in the art to understand exemplary features and functions of the present disclosure. Such persons would understand, however, that the present disclosure is not restricted to the illustrated example architectures or configurations, but can be implemented using a variety of alternative architectures and configurations. Additionally, as would be understood by persons of ordinary skill in the art, one or more features of one embodiment can be combined with one or more features of another embodiment described herein. Thus, the breadth and scope of the present disclosure should not be limited by any of the above-described exemplary embodiments.

It is also understood that any reference to an element herein using a designation such as "first, " "second, " and so forth does not generally limit the quantity or order of those elements. Rather, these designations can be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, a reference to first and second elements does not mean that only two elements can be employed, or that the first element must precede the second element in some manner.

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

A person of ordinary skill in the art 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 can be implemented by electronic hardware (e.g., a digital implementation, an analog implementation, or a combination of the two) , firmware, various forms of program or design code incorporating instructions (which can be referred to herein, for convenience, as "software" or a "software module) , or any combination of these techniques.

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 a combination of these techniques, depends upon the particular application and design constraints imposed on the overall system. Skilled artisans can implement the described functionality in various ways for each particular application, but such implementation decisions do not cause a departure from the scope of the present disclosure. In accordance with various embodiments, a processor, device, component, circuit, structure, machine, module, etc. can be configured to perform one or more of the functions described herein. The term “configured to” or “configured for” as used herein with respect to a specified operation or function refers 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, a person of ordinary skill in the art would understand that various illustrative logical blocks, modules, devices, components and circuits described herein can be implemented within or performed by an integrated circuit (IC) that can 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 logical blocks, modules, and circuits can further include antennas and/or transceivers to communicate with various components within the network or within the device. A general purpose processor can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, or state machine. A processor can 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 to perform the functions described herein.

If implemented in software, the functions can be stored as one or more instructions or code on a computer-readable medium. Thus, the steps of a method or algorithm disclosed herein can be implemented 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 can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can include 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 document, 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 purpose of discussion, the various modules are described as discrete modules; however, as would 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 associated functions according embodiments of the present disclosure.

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

Various modifications to the implementations described in this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other implementations without departing from the scope of this disclosure. Thus, the disclosure is not intended to be limited to the implementations shown herein, but is to be accorded the widest scope consistent with the novel features and principles disclosed herein, as recited in the claims below.

Claims

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

determining a first maximum transmission power for a first uplink transmission in a first cell;

determining a second maximum transmission power for a second uplink transmission in the first cell; and

performing both the first uplink transmission and the second uplink transmission based on at least one of the first maximum transmission power and the second maximum transmission power.
The method of claim 1, wherein the first uplink transmission and the second uplink transmission are performed with a maximum transmission power that is equal to a minimum of the first maximum transmission power and the second maximum transmission power.
The method of claim 1, wherein:

the first uplink transmission and the second uplink transmission are performed with a maximum transmission power that is equal to the second maximum transmission power; and

the second maximum transmission power is determined based at least partially on a transmission power for a third uplink transmission in a second cell.
The method of claim 3, wherein:

the first cell is in a first cell group for a dual connection or multi-connection of the wireless communication device; and

the second cell is in a second cell group for the dual connection or multi-connection of the wireless communication device.
The method of claim 4, wherein:

the first cell group is a secondary cell group; and

the second cell group is a master cell group.
The method of claim 1, wherein:

the first maximum transmission power is equal to a total transmission power supported by the wireless communication device.
The method of claim 1, wherein the second maximum transmission power is determined based on:

a transmission power for a third uplink transmission in a second cell;

a total transmission power supported by the wireless communication device;

a maximum transmission power pre-configured for an uplink transmission of the wireless communication device; and

a minimum function.
The method of claim 7, wherein:

the third uplink transmission and the second uplink transmission are scheduled on overlapping time-domain transmission resources.
The method of claim 1, wherein:

the first maximum transmission power is determined not later than a first cut-off time associated with the first uplink transmission; and

the second maximum transmission power is determined not later than a second cut-off time associated with the second uplink transmission, wherein the first cut-off time is before the second cut-off time.
The method of claim 1, wherein:

the first uplink transmission and the second uplink transmission are scheduled on overlapping time-domain transmission resources.
A method performed by a wireless communication device, comprising:

receiving a first downlink control information (DCI) scheduling a first uplink transmission to be transmitted in a first cell group associated with the wireless communication device;

receiving a second DCI scheduling a second uplink transmission to be transmitted in the first cell group; and

receiving a third DCI scheduling a third uplink transmission to be transmitted in a second cell group associated with the wireless communication device, wherein neither or each of the first uplink transmission and the second uplink transmission is scheduled on a time-domain transmission resource overlapping with a time-domain transmission resource of the third uplink transmission.
The method of claim 11, wherein:

an end symbol of a time-domain transmission resource of the second uplink transmission is scheduled to be no later than an end symbol of a time-domain transmission resource of the first uplink transmission.
A method performed by a wireless communication device, comprising:

receiving a first downlink control information (DCI) scheduling a first uplink transmission to be transmitted in a first cell group associated with the wireless communication device;

receiving a second DCI scheduling a second uplink transmission to be transmitted in the first cell group; and

receiving a third DCI scheduling a third uplink transmission to be transmitted in a second cell group associated with the wireless communication device, wherein at least two of the first uplink transmission, the second uplink transmission, and the third uplink transmission are scheduled on non-overlapping time-domain transmission resources.
The method of claim 13, wherein:

the second DCI is received not earlier than a cut-off time associated with the first uplink transmission.
The method of claim 13, wherein:

the second DCI is received not earlier than a cut-off time associated with the third uplink transmission.
The method of claim 13, wherein:

the first uplink transmission and the second uplink transmission are scheduled on non-overlapping time-domain transmission resources.
The method of claim 13, wherein:

the third uplink transmission and the second uplink transmission are scheduled on non-overlapping time-domain transmission resources.
A method performed by a wireless communication device, the method comprising:

determining a maximum transmission power for uplink transmissions of the wireless communication device on a time unit in a first cell group for a dual connection or multi-connection of the wireless communication device,

wherein the maximum transmission power is determined based on a semi-static frame structure configuration of a second cell group for the dual connection or multi-connection of the wireless communication device.
The method of claim 18, wherein:

a length of the time unit is equal to that of a longest time unit on all component carriers in the first cell group; and

the time unit is one of: a frame, a sub-frame, a slot, a sub-slot.
A method performed by a wireless communication node, the method comprising:

scheduling, for a wireless communication device, a first uplink transmission in a first cell and a second uplink transmission in the first cell; and

receiving, from the wireless communication device, both the first uplink transmission and the second uplink transmission that are transmitted based on at least one of: a first maximum transmission power determined for the first uplink transmission, and a second maximum transmission power determined for the second uplink transmission.
The method of claim 20, wherein the first uplink transmission and the second uplink transmission are received with a maximum transmission power that is equal to a minimum of the first maximum transmission power and the second maximum transmission power.
The method of claim 20, wherein:

the first uplink transmission and the second uplink transmission are received with a maximum transmission power that is equal to the second maximum transmission power; and

the second maximum transmission power is determined based at least partially on a transmission power for a third uplink transmission in a second cell.
The method of claim 22, wherein:

the first cell is in a first cell group for a dual connection or multi-connection of the wireless communication device; and

the second cell is in a second cell group for the dual connection or multi-connection of the wireless communication device.
The method of claim 23, wherein:

the first cell group is a secondary cell group; and

the second cell group is a master cell group.
The method of claim 20, wherein:

the first maximum transmission power is equal to a total transmission power supported by the wireless communication device.
The method of claim 20, wherein the second maximum transmission power is determined based on:

a transmission power for a third uplink transmission in a second cell;

a total transmission power supported by the wireless communication device;

a maximum transmission power pre-configured for an uplink transmission of the wireless communication device; and

a minimum function.
The method of claim 26, wherein:

the third uplink transmission and the second uplink transmission are scheduled on overlapping time-domain transmission resources.
The method of claim 20, wherein:

the first maximum transmission power is determined not later than a first cut-off time associated with the first uplink transmission; and

the second maximum transmission power is determined not later than a second cut-off time associated with the second uplink transmission, wherein the first cut-off time is before the second cut-off time.
The method of claim 20, wherein:

the first uplink transmission and the second uplink transmission are scheduled on overlapping time-domain transmission resources.
A method performed by a wireless communication node, comprising:

transmitting, to a wireless communication device, a first downlink control information (DCI) scheduling a first uplink transmission to be transmitted in a first cell group associated with the wireless communication device; and

transmitting, to the wireless communication device, a second DCI scheduling a second uplink transmission to be transmitted in the first cell group, wherein

the wireless communication device receives a third DCI scheduling a third uplink transmission to be transmitted in a second cell group associated with the wireless communication device, and

neither or each of the first uplink transmission and the second uplink transmission is scheduled on a time-domain transmission resource overlapping with a time-domain transmission resource of the third uplink transmission.
The method of claim 30, wherein:

an end symbol of a time-domain transmission resource of the second uplink transmission is scheduled to be no later than an end symbol of a time-domain transmission resource of the first uplink transmission.
A method performed by a wireless communication node, comprising:

transmitting, to a wireless communication device, a first downlink control information (DCI) scheduling a first uplink transmission to be transmitted in a first cell group associated with the wireless communication device; and

transmitting, to the wireless communication device, a second DCI scheduling a second uplink transmission to be transmitted in the first cell group, wherein

the wireless communication device receives a third DCI scheduling a third uplink transmission to be transmitted in a second cell group associated with the wireless communication device, and

at least two of the first uplink transmission, the second uplink transmission, and the third uplink transmission are scheduled on non-overlapping time-domain transmission resources.
The method of claim 32, wherein:

the second DCI is received by the wireless communication device not earlier than a cut-off time associated with the first uplink transmission.
The method of claim 32, wherein:

the second DCI is received by the wireless communication device not earlier than a cut-off time associated with the third uplink transmission.
The method of claim 32, wherein:

the first uplink transmission and the second uplink transmission are scheduled on non-overlapping time-domain transmission resources.
The method of claim 32, wherein:

the third uplink transmission and the second uplink transmission are scheduled on non-overlapping time-domain transmission resources.
A method performed by a wireless communication node, the method comprising:

determining, for a wireless communication device, a semi-static frame structure configuration in a first cell group for a dual connection or multi-connection of the wireless communication device,

wherein a maximum transmission power is determined, based on the semi-static frame structure configuration, for uplink transmissions of the wireless communication device on a time unit in a second cell group for the dual connection or multi-connection of the wireless communication device.
The method of claim 37, wherein:

a length of the time unit is equal to that of a longest time unit on all component carriers in the second cell group; and

the time unit is one of: a frame, a sub-frame, a slot, a sub-slot.
A wireless communication apparatus comprising a processor and a memory, wherein the processor is configured to read code from the memory and implement a method recited in any of claims 1 to 38.
A computer program product comprising a computer-readable program medium code stored thereupon, the code, when executed by a processor, causing the processor to implement a method recited in any of claims 1 to 38.