KR20220058060A - Method and Apparatus for Controlling Uplink Transmission Power in Wireless Communications System - Google Patents

Abstract

Disclosed are a method and an apparatus for controlling uplink transmission power in a wireless communication system. According to one aspect of the present disclosure, in a wireless communication system supporting dual connectivity with a first cell group and a second cell group, a base station is provided as a first base station serving the first cell group, the base station including: a transmission power calculation unit for receiving power headroom for the first cell group from a terminal and calculating first transmission power for the first cell group of the terminal on the basis of the power headroom for the first cell group; a scheduling information obtaining unit configured to obtain power information of the second cell group of the terminal and a second uplink transmission timing of the second cell group of the terminal; and a scheduling unit for performing uplink scheduling for the terminal on the basis of at least one of the first transmission power, power information for the second cell group, and the second uplink transmission timing.

Description

Method and Apparatus for Controlling Uplink Transmission Power in Wireless Communications System

The present disclosure relates to a method and apparatus for controlling uplink transmission power in a wireless communication system. More particularly, it relates to a method and apparatus for controlling uplink transmission power in a wireless communication system supporting MR-DC (Multi-Rat Dual Connectivity).

The content described in this section merely provides background information on the present invention and does not constitute the prior art.

Residual power (power headroom) is an information element (IE) used by the terminal to inform the base station of the remaining transmit power usable for uplink transmission. The terminal reports the residual power to the base station using a MAC control element (CE), and the base station performs uplink scheduling based on the residual power of the terminal. In the 5G NR standard defined by 3GPP, three types of residual power are defined, type 1, 2, and 3, and the standard work for the second type (type 2) will be completed in release-16 and release-17. , in release-15, only the residual power of the first type (type 1) is used for uplink data channel (PUSCH) and/or uplink control channel (PUCCH) transmission.

In a 5G wireless communication system having a dual-connectivity structure, the terminal reports residual power to each of the LTE base station and the NR base station, and the LTE base station and the NR base station perform uplink scheduling based on the respectively reported residual power. . In this case, the NR base station receiving the first type of residual power is not known about the transmission power used in the LTE network, and performs NR uplink scheduling based on only the residual power for the NR network. Similarly, the LTE base station receiving the first type of residual power report does not know the transmission power used in the NR network, and performs LTE uplink scheduling based on only the residual power for the LTE network. Accordingly, in both LTE and NR, a case may occur in which the maximum transmission power of the terminal is intended to be used.

1 is an exemplary diagram for explaining the operation of a terminal according to whether or not Dynamic Power Sharing is supported in an uplink transmission power limitation situation.

Referring to Figure 1 (a), when the terminal supports Dynamic Power Sharing (DPS), the terminal is the maximum transmission of the terminal the sum of the LTE uplink transmission power (P _LTE ) and the NR uplink transmission power (P _NR ) By adaptively adjusting the LTE uplink transmission power (P _LTE ) and the NR uplink transmission power (P _NR ) to be smaller than the power (P _max ), the LTE uplink grant and the NR uplink grant all can be dealt with

However, if the UE does not support DPS, the UE can process only the uplink grant of the Master Cell Group (MCG), and the uplink grant of the Secondary Cell Group (SCG) to be processed. can't For example, referring to (b) of Figure 1, in the 5G wireless communication system of the EN-DC (E-UTRA-NR Dual Connectivity) structure, LTE uplink transmission power (P _LTE ) and NR uplink transmission power (P _NR ), when the maximum transmission power (P _max ) of the terminal is allocated to each, the terminal may perform only LTE uplink transmission due to uplink transmission power limitation.

In this case, since the NR base station has performed uplink scheduling for the terminal, the terminal expects NR uplink transmission, but the terminal cannot perform NR uplink transmission due to uplink transmission power limitation, causing a UL grant non-response problem. do.

The present disclosure provides a method and apparatus for controlling uplink transmission power in a wireless communication system, which can solve a UL grant non-response problem that occurs when a non-DPS terminal attempts to use the maximum transmission power of the terminal in both LTE and NR The main purpose is to

According to an aspect of the present disclosure, in a wireless communication system supporting dual connectivity with a first cell group and a second cell group, as a first base station serving the first cell group, Transmission power for receiving power headroom for the first cell group from the UE and calculating the first transmission power for the first cell group of the UE based on the remaining power for the first cell group output unit; a scheduling information obtaining unit for obtaining power information for the second cell group of the terminal and a second uplink transmission timing for the second cell group of the terminal; and a scheduling unit configured to perform uplink scheduling for the terminal based on at least one of the first transmission power, the power information for the second cell group, and the second uplink transmission timing. provides

According to another aspect of the present disclosure, in a wireless communication system supporting dual connectivity with a first cell group and a second cell group, by a first base station serving the first cell group In the performed uplink scheduling method, receiving power headroom for the first cell group from a terminal, and receiving the power headroom for the first cell group of the terminal based on the residual power for the first cell group calculating the first transmission power; obtaining power information for the second cell group of the terminal and a second uplink transmission timing for the second cell group of the terminal; and performing uplink scheduling for the terminal based on at least one of the first transmission power, the power information for the second cell group, and the second uplink transmission timing. A scheduling method is provided.

As described above, according to the embodiment of the present disclosure, it is possible to solve the UL grant non-response problem that occurs when the terminal not supporting DPS attempts to use the maximum transmission power of the terminal in both LTE and NR. Accordingly, it is possible to maximize the LTE uplink transmission rate and the NR uplink transmission rate of the UE supporting Multi-Rat Dual Connectivity (MR-DC).

1 is an exemplary diagram for explaining the operation of a terminal according to whether or not Dynamic Power Sharing is supported in an uplink transmission power limitation situation.
2 is an exemplary diagram illustrating the structure of a MAC control element for remaining power report.
3 is a flowchart illustrating a message flow for uplink scheduling according to the first embodiment of the present disclosure.
4 is a flowchart illustrating an uplink scheduling method of a base station according to the first embodiment of the present disclosure.
5 is a flowchart illustrating a message flow for uplink scheduling according to a second embodiment of the present disclosure.
6 is a flowchart illustrating an uplink scheduling method of a base station according to a second embodiment of the present disclosure.
7 is an exemplary diagram for explaining uplink transmission power control of a base station according to a second embodiment of the present disclosure.
8 is a block diagram schematically illustrating a base station according to an embodiment of the present disclosure.

Hereinafter, some embodiments of the present disclosure will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the present disclosure, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present disclosure, the detailed description thereof will be omitted.

In addition, in describing the components of the present disclosure, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. Throughout the specification, when a part 'includes' or 'includes' a certain element, this means that other elements may be further included, rather than excluding other elements, unless otherwise stated. . In addition, the '... Terms such as 'unit' and 'module' mean a unit that processes at least one function or operation, which may be implemented as hardware or software or a combination of hardware and software.

The present disclosure may be described with reference to 3GPP TS 38.101, TS 38.133, and TS 38.321, which are technical specifications related to 5G, but this is for convenience of description and does not limit various embodiments of the present disclosure.

The present disclosure describes a wireless communication system capable of providing a dual connectivity service to a terminal by coexisting an existing wireless communication system and a next-generation wireless communication system and interworking with different wireless access technologies. The embodiment of the present disclosure will be described using a 4G LTE system (4th Generation Long Term Evolution system) as an example as an existing wireless communication system and a 5G NR system (5th Generation New Radio system) as an example of a next-generation wireless communication system. However, this is for convenience of description, and the present invention is expandable to systems other than the 4G LTE system and/or the 5G NR system.

Furthermore, in the present disclosure, the master cell group (Master Cell Group, MCG) is an LTE network, and the secondary cell group (Secondary Cell Group, SCG) is an NR network EN-DC (E-UTRA-NR Dual Connectivity) having a structure Although described based on a communication system, this is only an example, and is not limited to this example. For example, the present disclosure may be applied to a wireless communication system having a NG-RAN E-UTRA-NR Dual Connectivity (NGEN-DC) structure in which the master cell group is an NR network and the secondary cell group is an LTE network.

In the present disclosure, the master cell group and the secondary cell group may be expressed as a first cell group and/or a second cell group. For example, when the first cell group is a master cell group, the second cell group may be a secondary cell group, and when the first cell group is a secondary cell group, the second cell group may be a master cell group.

Hereinafter, before describing various embodiments of the present disclosure, power headroom will be described.

2 is an exemplary diagram illustrating the structure of a MAC control element for remaining power report.

Referring to FIG. 2 , a PH field in a MAC Control Element (CE) indicates a power headroom level. The length of the PH field is 6 bits, and accordingly, the terminal may report 64 (= ²⁶ ) types of residual power levels to the base station.

Table 1 is a table exemplifying the residual power level according to the value of the PH field.

Table 2 is a table exemplifying the range of the reported residual power level and the mapped residual power (Power Headroom, PH).

Referring to Tables 1 and 2, when the value assigned to the PH field is "000000", it indicates that the residual power is within the range of "PH < -32 [dB]".

The base station may calculate the transmission power used by the terminal in the network based on the residual power reported from the terminal. For example, the transmission power (P _real ) used by the terminal may be calculated as in Equation 1.

Here, P _max is the maximum transmission power of the terminal.

Table 3 shows the maximum transmission power and tolerance that the UE can physically transmit according to the 5G NR frequency band and the power class of the UE. In the NR system, the default power class is class 3, and the maximum transmission power by power class 3 is 23 [dBm], and each manufacturer may have a different tolerance.

Hereinafter, a method for controlling uplink transmission power according to a first embodiment of the present disclosure will be described with reference to FIGS. 3 and 4 .

The uplink transmission power control method according to the first embodiment of the present disclosure assumes that the NR base station receives a second type of residual power report from the terminal. That is, the NR base station may receive a report of the remaining power (PHR _LTE ) for the LTE network from the terminal, and based on this, the LTE uplink transmission power (P _{LTE _adjust} ) allocated by the terminal to the LTE network may be estimated.

3 is a flowchart illustrating a message flow for uplink scheduling according to the first embodiment of the present disclosure.

The UE reports the remaining power (PHR _LTE ) for the LTE network to the eNB (S300). The eNB calculates the LTE uplink transmission power (P _{LTE_adjust} ) based on the residual power (PHR _LTE ) for the LTE network.

The eNB performs LTE uplink scheduling for the terminal based on the _LTE uplink transmission power (P _{LTE_adjust} ) (S310).

The UE reports the remaining power for the LTE network (PHR _LTE ) and the remaining power for the NR network (PHR _NR ) to the gNB ( S320 ). The gNB calculates the NR uplink transmission power (P _{NR_adjust} ) and the _LTE uplink transmission power (P _{LTE_adjust} ) based on the residual power for the NR network (PHR _NR ) and the residual power for the LTE network (PHR _LTE ).

The gNB acquires the LTE PUCCH/PUSCH transmission timing scheduled for the UE by the eNB from the eNB (S330). Here, the gNB may acquire LTE PUCCH/PUSCH transmission timing through information exchange between the eNB and the scheduler. For example, when the scheduling of the gNB and the scheduling of the eNB are performed in the same hardware device, LTE PUCCH / PUSCH transmission timing through information exchange between the NR scheduler module and the LTE scheduler module can be obtained On the other hand, when gNB scheduling and eNB scheduling are performed in different hardware devices, LTE PUCCH/PUSCH transmission timing may be acquired through a vendor-specific information exchange method.

The gNB performs NR uplink scheduling for the UE based on the _LTE uplink transmission power (P _{LTE_adjust} ), the _NR uplink transmission power (P _{NR_adjust} ), and the LTE PUCCH/PUSCH transmission timing (S340). gNB does not perform NR uplink scheduling for the terminal when _LTE uplink transmission power (P _{LTE_adjust} ), NR uplink transmission power (P _{NR_adjust} ), and LTE PUCCH/PUSCH transmission timing satisfy preset conditions , it is possible to prevent the UL grant non-response situation due to the transmission power limitation of the terminal.

4 is a flowchart illustrating an uplink scheduling method of a base station according to the first embodiment of the present disclosure.

gNB is LTE uplink transmission power (P _{LTE _adjust} ) and It is checked whether the sum of the NR uplink transmission powers (P _{NR _adjust} ) is greater than the maximum transmission power (P _max ) of the terminal ( S400 ).

LTE uplink transmission power (P _{LTE _adjust} ) and When the sum of the NR uplink transmission power (P _{NR _adjust} ) is less than or equal to the maximum transmission power (P _max ) of the terminal, the gNB performs NR uplink scheduling based on the NR uplink transmission power (P _{NR_adjust} ) ( S430).

LTE uplink transmission power (P _{LTE _adjust} ) and When the sum of the NR uplink transmission powers (P _{NR _adjust} ) is greater than the maximum transmission power of the terminal (P _max ), the gNB has the LTE uplink transmission power (P _{LTE _adjust} ) greater than the maximum transmission power of the terminal (P _max ). or the same (S410).

When the LTE uplink transmission power (P _{LTE _adjust} ) is less than the maximum transmission power (P _max ) of the terminal, the gNB performs NR uplink scheduling based on the NR uplink transmission power (P _{NR _adjust} ) (S430). In this case, the terminal may perform NR uplink transmission with the remaining power used for LTE uplink transmission.

When the LTE uplink transmission power (P _{LTE_adjust} ) is greater than or equal to the maximum transmission power (P _max ) of the terminal, the gNB determines that the NR uplink transmission timing to be scheduled to the terminal overlaps with the LTE PUCCH/PUSCH transmission timing obtained from the eNB ( overlap) is checked (S420).

When the NR uplink transmission timing and the LTE PUCCH/PUSCH transmission timing overlap, the gNB does not perform NR uplink scheduling for the UE. In this case, even if the terminal receives the NR uplink grant, this is because there is no transmission power available for NR uplink transmission.

On the other hand, when the NR uplink transmission timing and the LTE PUCCH/PUSCH transmission timing do not overlap, the gNB performs NR uplink scheduling based on the NR uplink transmission power (P _{NR_adjust} ) (S430).

According to the first embodiment of the present disclosure, the gNB may determine the uplink transmission power used in the LTE network and the NR network based on the residual power report, and may use this to determine whether to perform NR UL scheduling for the UE. However, the eNB cannot determine the uplink transmission power used in the NR network, and thus cannot perform integrated uplink transmission power control between the eNB and the gNB.

Hereinafter, a method for controlling uplink transmission power according to a second embodiment of the present disclosure will be described with reference to FIGS. 5 and 6 .

The second embodiment of the present disclosure proposes a method for controlling uplink transmission power using power information exchange between an eNB and a gNB.

Hereinafter, in the second embodiment of the present disclosure, a case in which the NR base station receives only the residual power (PHR _NR ) for the NR network from the terminal will be described as an example. However, this is for convenience of description, and the uplink transmission power control method according to the second embodiment of the present disclosure can be applied regardless of the type of residual power reported by the NR base station from the terminal.

5 is a flowchart illustrating a message flow for uplink transmission power control according to a second embodiment of the present disclosure.

The UE reports the remaining power (PHR _LTE ) for the LTE network to the eNB (S500). The eNB calculates the LTE uplink transmission power (P _{LTE_adjust} ) based on the residual power (PHR _LTE ) for the LTE network.

The UE reports the remaining power (PHR _NR ) for the NR network to the gNB (S510). The gNB calculates the NR uplink transmission power (P _{NR _adjust} ) based on the residual power (PHR _NR ) for the NR network.

The eNB and the gNB exchange power information and uplink transmission timing information to be scheduled to the UE. In this case, the power information exchanged between the eNB and the gNB may include the residual power and/or the uplink transmission power calculated based on the residual power received from the terminal. According to an embodiment of the present disclosure, the gNB may receive the residual power report (PHR _LTE ) for the LTE network from the eNB, and calculate the LTE uplink transmission power (P _{LTE _adjust} ) based on this. According to another embodiment of the present disclosure, the gNB may receive the LTE uplink transmission power (P _{LTE _adjust} ) calculated by the eNB. Power information exchange between the eNB and the gNB may be triggered according to reception of a residual power report from the terminal. The eNB and the gNB may exchange power information using an already used Stream Control Transmission Protocol (SCTP).

The eNB and the gNB perform scheduling for the UE based on the exchanged power information and uplink transmission timing information (S530 and S540). At this time, when a preset condition is satisfied, the eNB transmits a Transmit Power Control command (TPC command) instructing the UE to lower the transmission power for the LTE uplink path, thereby UL caused by the transmission power limitation of the UE. It can prevent the grant non-response situation.

6 is a flowchart illustrating an uplink scheduling method of a base station according to a second embodiment of the present disclosure.

7 is an exemplary diagram for explaining uplink transmission power control of a base station according to a second embodiment of the present disclosure.

eNB is LTE uplink transmission power (P _{LTE _adjust} ) and It is checked whether the sum of the NR uplink transmission powers (P _{NR _adjust} ) is greater than the maximum transmission power of the terminal (P _max ) ( S600 ).

LTE uplink transmission power (P _{LTE _adjust} ) and When the sum of the NR uplink transmission power (P _{NR _adjust} ) is less than or equal to the maximum transmission power (P _max ) of the terminal, the eNB performs uplink scheduling based on the LTE uplink transmission power (P _{LTE_adjust} ) (S640) ).

LTE uplink transmission power (P _{LTE _adjust} ) and When the sum of the NR uplink transmission powers (P _{NR _adjust} ) is greater than the maximum transmission power of the terminal (P _max ), the eNB determines that the LTE uplink transmission power (P _{LTE _adjust} ) is greater than the maximum transmission power of the terminal (P _max ). or the same (S610).

When the _LTE uplink transmission power (P _{LTE_adjust} ) is less than the maximum transmission power (P _max ) of the terminal, the eNB performs uplink scheduling based on the LTE uplink transmission power (P _{LTE_adjust} ) ( S640 ).

If the LTE uplink transmission power (P _{LTE_adjust} ) is greater than or equal to the maximum transmission power (P _max ) of the terminal, the eNB checks whether the NR uplink transmission timing overlaps the LTE PUCCH / PUSCH transmission timing (S620) .

When the NR uplink transmission timing and the LTE PUCCH/PUSCH transmission timing do not overlap, the eNB performs uplink scheduling based on the LTE uplink transmission power (P _{LTE_adjust} ) (S640).

When the NR uplink transmission timing and the LTE PUCCH / PUSCH transmission timing overlap, the eNB updates the LTE uplink transmission power (P _{LTE_adjust} ) to a value lower than the maximum transmission power (P _max ) of the UE (S630) , uplink scheduling is performed based on this (S640). Specifically, referring to FIG. 7 , the eNB may update the LTE uplink transmission power (P _{LTE_adjust} ) to a value obtained by subtracting the preset offset power (P _stepdown ) from the maximum transmission power (P _max ) of the terminal. In this case, the eNB may instruct the UE to lower the LTE uplink transmission power by transmitting a Transmit Power Control command (TPC command) to the UE. Accordingly, the terminal P _max - _{It is possible to perform NR uplink transmission by using as much power as P LTE_adjust .} Accordingly, the gNB according to the second embodiment of the present disclosure performs NR uplink scheduling even when the NR uplink transmission timing and the LTE PUCCH/PUSCH transmission timing overlap.

As described above, according to the second embodiment of the present disclosure, by using power information exchange between base stations, the eNB can determine the uplink transmission power used (or to be used) in the NR network, and based on this, LTE uplink transmission Power can be adjusted. For example, in the case of using the maximum transmission power of the UE in the LTE network and the NR network, respectively, the eNB lowers the LTE uplink transmission power so that the UE can process both the LTE uplink grant and the NR uplink grant. .

8 is a block diagram schematically illustrating a base station according to an embodiment of the present disclosure.

8, the base station 800 according to an embodiment of the present disclosure includes a transmission power calculation unit 810, a scheduling information acquisition unit 820, and a scheduling information transmission unit ( All or part of a scheduling information transmission unit 830 and a scheduling unit 840 are included. Not all blocks shown in FIG. 8 are essential components, and some blocks included in the base station 800 may be added, changed, or deleted in another embodiment. That is, in the case of FIG. 8, the base station 800 according to the present embodiment exemplifies components for determining whether to perform scheduling or controlling the transmission power of the terminal based on the uplink transmission power and the uplink transmission timing. As shown, it should be appreciated that the base station 800 may have more or fewer components or different components than those shown for implementing other functions.

The transmission power calculator 810 receives a report from the terminal of the residual power for the cell group served by the base station (hereinafter, 'first cell group'), and based on this, the transmission power for the first cell group (hereinafter, 'first cell group') is reported. 1 Transmission power') is calculated. For example, when the base station 800 is an LTE base station, the transmission power calculating unit 810 calculates the transmission power allocated by the terminal to the LTE network. Similarly, when the base station 800 is an NR base station, the transmission power calculation unit 810 calculates the transmission power allocated to the NR network by the terminal.

The scheduling information obtaining unit 820 obtains scheduling information for a cell group (hereinafter, 'second cell group') served by another base station. Here, the scheduling information for the second cell group includes transmission power for the second cell group (hereinafter, 'second transmission power') and an uplink transmission timing for the second cell group.

According to an embodiment of the present disclosure, the scheduling information obtaining unit 820 receives power information for a second cell group and a second uplink transmission timing from another base station. Here, the second uplink transmission timing means an uplink transmission timing that another base station schedules to the terminal.

According to an embodiment of the present disclosure, the power information for the second cell group may include residual power for the second cell group or the second transmission power. When the residual power for the second cell group is received, the scheduling information obtaining unit 820 may calculate the second transmission power based on the received power. For example, when the base station 800 is an LTE base station, the scheduling information obtaining unit 820 receives the residual power for the NR network from the NR base station, and calculates the transmission power allocated to the NR network by the terminal based on this. can

According to another embodiment of the present disclosure, the scheduling information obtaining unit 820 may receive a report of the remaining power for the second cell group from the terminal, and may calculate the second transmission power based on the report.

The scheduling information transmitter 830 transmits scheduling information for the first cell group to another base station. Here, the scheduling information for the first cell group includes at least one of a residual power for the first cell group, a first transmission power, and a first uplink transmission timing. Here, the first uplink transmission timing means an uplink transmission timing to be scheduled by the base station to the terminal.

The scheduling unit 840 performs uplink scheduling for the terminal based on at least one of the first transmission power, the second transmission power, the first uplink transmission timing, and the second uplink transmission timing.

The scheduling unit 840 according to the first embodiment of the present disclosure performs uplink scheduling for the terminal based on at least one of a first transmission power, a second transmission power, a first uplink transmission timing, and a second uplink transmission timing. determine whether to perform

Specifically, in the scheduling unit 840 according to the first embodiment of the present disclosure, the sum of the first transmission power and the second transmission power is greater than the maximum transmission power of the terminal, and the second transmission power is greater than the maximum transmission power of the terminal. or equal to, and when the first uplink transmission timing and the second uplink transmission timing overlap, it is determined that uplink scheduling for the terminal is not performed.

The scheduling unit 840 according to the second embodiment of the present disclosure controls the first transmission power based on at least one of a first transmission power, a second transmission power, a first uplink transmission timing, and a second uplink transmission timing. do.

Specifically, in the scheduling unit 840 according to the first embodiment of the present disclosure, the sum of the first transmission power and the second transmission power is greater than the maximum transmission power of the terminal, and the first transmission power is greater than the maximum transmission power of the terminal. or equal to, and when the first uplink transmission timing and the second uplink transmission timing overlap, the first transmission power is controlled to be smaller than the maximum transmission power of the terminal. In this case, the scheduling unit 840 may instruct the UE to lower the LTE uplink transmission power by transmitting a Transmit Power Control command (TPC command) to the UE.

Although it is described that each process is sequentially executed in FIGS. 3 to 6 , this is merely illustrative of the technical idea of an embodiment of the present disclosure. In other words, those of ordinary skill in the art to which an embodiment of the present disclosure pertain change the order described in FIGS. 3 to 6 within the range that does not deviate from the essential characteristics of an embodiment of the present disclosure, or during each process. Since one or more processes may be variously modified and modified to be executed in parallel, FIGS. 3 to 6 are not limited to a chronological order.

Various implementations of the systems and techniques described herein may be implemented in digital electronic circuitry, integrated circuitry, field programmable gate array (FPGA), application specific integrated circuit (ASIC), computer hardware, firmware, software, and/or combination can be realized. These various implementations may include being implemented in one or more computer programs executable on a programmable system. The programmable system includes at least one programmable processor (which may be a special purpose processor) coupled to receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device. or may be a general-purpose processor). Computer programs (also known as programs, software, software applications or code) contain instructions for a programmable processor and are stored on a "computer-readable recording medium".

The computer-readable recording medium includes all types of recording devices in which data readable by a computer system is stored. These computer-readable recording media are non-volatile or non-transitory, such as ROM, CD-ROM, magnetic tape, floppy disk, memory card, hard disk, magneto-optical disk, and storage device. It may be a medium, and may further include a transitory medium such as a data transmission medium. In addition, the computer-readable recording medium may be distributed in a network-connected computer system, and the computer-readable code may be stored and executed in a distributed manner.

Various implementations of the systems and techniques described herein may be implemented by a programmable computer. Here, the computer includes a programmable processor, a data storage system (including volatile memory, non-volatile memory, or other types of storage systems or combinations thereof), and at least one communication interface. For example, a programmable computer may be one of a server, a network appliance, a set-top box, an embedded device, a computer expansion module, a personal computer, a laptop, a Personal Data Assistant (PDA), a cloud computing system, or a mobile device.

The above description is merely illustrative of the technical idea of this embodiment, and a person skilled in the art to which this embodiment belongs may make various modifications and variations without departing from the essential characteristics of the present embodiment. Accordingly, the present embodiments are intended to explain rather than limit the technical spirit of the present embodiment, and the scope of the technical spirit of the present embodiment is not limited by these embodiments. The protection scope of this embodiment should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present embodiment.

800: base station 810: transmission power calculation unit
820: scheduling information obtaining unit 830: scheduling information transmitting unit
840: scheduling unit

Claims (8)

In a wireless communication system supporting dual connectivity with a first cell group and a second cell group, as a first base station serving the first cell group,
Transmission power for receiving power headroom for the first cell group from the UE and calculating the first transmission power for the first cell group of the UE based on the remaining power for the first cell group output unit;
a scheduling information obtaining unit for obtaining power information for the second cell group of the terminal and a second uplink transmission timing for the second cell group of the terminal; and
A scheduling unit configured to perform uplink scheduling for the terminal based on at least one of the first transmission power, power information for the second cell group, and the second uplink transmission timing
A base station comprising a. According to claim 1,
Further comprising a scheduling information transmitter for transmitting power information for the first cell group and a first uplink transmission timing to be scheduled by the first base station to the terminal to a second base station serving the second cell group,
Power information for the first cell group,
The base station, characterized in that it includes the residual power or the first transmission power for the first cell group. According to claim 1,
Power information for the second cell group,
and a second transmission power calculated based on the residual power for the second cell group or the residual power for the second cell group. According to claim 1,
The scheduling unit,
When the first transmission power is greater than or equal to the maximum transmission power of the terminal, and the first uplink transmission timing scheduled by the first base station to the terminal overlaps with the second uplink transmission timing, the A base station, characterized in that instructing the terminal to lower the first transmission power. 4. The method of claim 3,
The scheduling unit,
When the second transmission power is greater than or equal to the maximum transmission power of the terminal, and the first uplink transmission timing to be scheduled by the first base station to the terminal overlaps the second uplink transmission timing, the A base station, characterized in that not performing uplink scheduling. In an uplink scheduling method performed by a first base station serving the first cell group in a wireless communication system supporting dual connectivity with a first cell group and a second cell group, ,
receiving power headroom for the first cell group from a terminal, and calculating a first transmission power for the first cell group of the terminal based on the residual power for the first cell group;
obtaining power information for the second cell group of the terminal and a second uplink transmission timing for the second cell group of the terminal; and
A process of performing uplink scheduling for the terminal based on at least one of the first transmission power, the power information for the second cell group, and the second uplink transmission timing
Uplink scheduling method comprising a. 7. The method of claim 6,
The process to be performed is
When the first transmission power is greater than or equal to the maximum transmission power of the terminal, and the first uplink transmission timing scheduled by the first base station to the terminal overlaps with the second uplink transmission timing, the An uplink scheduling method, characterized in that instructing a terminal to lower the first transmission power. 7. The method of claim 6,
Power information for the second cell group,
and a second transmission power calculated based on the residual power for the second cell group or the residual power for the second cell group,
The process to be performed is
When the second transmission power is greater than or equal to the maximum transmission power of the terminal, and the first uplink transmission timing to be scheduled by the first base station to the terminal overlaps the second uplink transmission timing, the An uplink scheduling method, characterized in that not performing uplink scheduling.

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