WO2017075837A1

WO2017075837A1 - Method, base station, terminal and system for transmitting and receiving downlink control information (dci)

Info

Publication number: WO2017075837A1
Application number: PCT/CN2015/094064
Authority: WO
Inventors: 肖洁华
Original assignee: 华为技术有限公司
Priority date: 2015-11-06
Filing date: 2015-11-06
Publication date: 2017-05-11

Abstract

Provided are a method, base station, terminal and system for transmitting and receiving downlink control information (DCI). The function of a transmit power control (TCP) domain in the DCI is no longer indicated by means of downlink assignment indexes (DAIs) in the DCI, but is indicated by means of a flag bit in the DCI. Even if the DAIs are sorted first in a frequency domain and then in a time domain, a main carrier can also bear a TPC having a function of power control in the TPC domain.

Description

Method, base station, terminal and system for transmitting or receiving downlink control information DCI

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method, a base station, a terminal, and a system for transmitting or receiving DCI (Downlink Control Information).

Background technique

In order to meet the requirements of single-user peak rate and system capacity increase, the most direct way is to increase the system transmission bandwidth. Therefore, CA (Carrier Aggregation) technology is applied. The CA technology aggregates two or more CCs (Component Carriers) to support a larger transmission bandwidth. One CC is also called a Serving Cell. Currently, the standardized CA technology is only Supports aggregation of up to 5 carriers.

In the LTE-A (Long Term Evolution-Advanced) system, the UE (User Equipment) transmits UCI (Uplink Control Information) through the PUCCH (Physical Uplink Control Channel). ), used to support uplink and downlink data transmission. UCI mainly includes the following information:

· SR (Scheduling Request): used by the terminal device to request an uplink UL-SCH (Uplink Shared Channel) resource from the base station;

· HARQ (Hybrid Automatic Repeat ReQuest) ACK/NACK: used by the terminal device to perform HARQ confirmation on the downlink data transmitted on the Physical Downlink Shared Channel (PDSCH). HARQ;

CSI (Channel State Information), which is used by the terminal device to inform the base station of the downlink channel quality, etc., to help the base station perform downlink scheduling, including CQI (Channel Quality Indicator) and PMI (Precoding Matrix Indicators). Information such as matrix indication), RI (Rank indicator, rank indication).

In the prior art, the base station performs partial control of PUCCH transmission through DCI, specifically The TPC (Transmit Power Control) field in the DCI is implemented, such as power control of the PUCCH or resource selection of the PUCCH. For example, when the DCI format is 1A/1B/1D/1/2A/2/2B/2C/2D, the TPC field in the DCI is used for power control of the PUCCH, and the scheduling values of different DCI format power control are different.

For the FDD (Frequency Division Duplex), the TPC field in the DCI carried on the primary carrier is used for PUCCH power control, and the TPC field in the DCI carried on all the secondary carriers is used for resource selection, and the terminal is at all The TPC fields received by the same subframe of the secondary carrier must be the same, as shown in FIG. 1A.

For TDD (Time Division Duplexing), DAI (Downlink Assignment Index) performs time domain sorting for each carrier, that is, frame sorting, and the first downlink subframe scheduled on the carrier. The DAI is 1, the DAI of the second downlink subframe that is scheduled is 2, and so on, as shown in FIG. 1B, and the TPC field in the DCI with DAI=1 on the primary carrier is used for PUCCH power control; and the primary carrier The TPC domain in the DCI with DAI>1 and the TPC domain of the DCI on all the secondary carriers are all resource selection for PUCCH, and the UE is in all TPC domains in the DCI with DAI>1 on the primary carrier and in the DCI on the secondary carrier. The TPC fields must be the same, as shown in Figure 1C.

At present, a new DAI sorting mechanism is introduced, that is, the sorting mode of the time domain after the first frequency domain, that is, the frequency domain is first performed according to the CC identification number in one subframe, which is also called the carrier domain sorting, and then reconnected. According to the time domain frame, as shown in Figure 1D, under this new DAI sorting mechanism, if the original power control mechanism is still used in the TDD scenario, there will be a defect that power control cannot be achieved. 1D is taken as an example. In FIG. 1D, the downlink subframe carrying DAI=1 is a secondary carrier, and the DCI carrying DAI=1 is not carried on the primary carrier. At this time, power control of the PUCCH cannot be performed.

In summary, there is currently a defect that the power control of the PUCCH cannot be performed under the new DAI sorting mechanism.

Summary of the invention

Embodiments of the present invention provide a method, a base station, a terminal, and a system for transmitting or receiving a DCI, It is used to solve the existing defects that cannot control the power of the PUCCH.

In a first aspect, a method for transmitting downlink control information DCI is provided, including:

Determining, by the base station, at least one DCI to be sent, each of the at least one DCI carrying a flag bit, where the flag bit is used to indicate a role of a transmit power control TPC domain in the DCI to which the DCI belongs;

The base station transmits the at least one DCI.

In conjunction with the first aspect, in a first possible implementation, the flag bit is used to indicate that the role of the TPC domain in the DCI to which it belongs is power control or resource selection.

With reference to the first aspect, or the first possible implementation manner of the first aspect, in a second possible implementation manner, the base station sends the at least one DCI, including:

Transmitting, by the base station, the at least one DCI on a primary carrier; or

Transmitting the at least one DCI on the secondary carrier of the base station; or

The base station transmits a partial DCI in the at least one DCI on a primary carrier, and transmits a DCI other than the DCI transmitted on the primary carrier in the at least one DCI on the secondary carrier.

In a second aspect, a method for receiving downlink control information DCI is provided, including:

Receiving, by the terminal, at least one DCI, where each DCI in the at least one DCI carries a flag bit, where the flag bit is used to indicate a role of a transmit power control TPC domain in the DCI to which the DCI belongs;

For any one of the at least one DCI, respectively performing:

Determining, by the terminal, the role of the TPC field in any one of the DCIs according to the flag of any one of the DCIs;

The terminal performs a corresponding operation according to the determined role of the TPC domain in any one of the DCIs.

With reference to the second aspect, in a first possible implementation manner, the flag bit is used to indicate that the role of the TPC domain in the DCI to which the DCI belongs is power control or resource selection;

The terminal performs a corresponding operation according to the determined role of the TPC domain in any one of the DCIs, including:

The terminal performs power control or resource selection according to the determined role of the TPC domain in any one of the DCIs.

Combining the second aspect, or the first possible implementation of the second aspect, in the second possibility In the implementation manner, the terminal receives at least one DCI, including:

Receiving, by the terminal, the at least one DCI on a primary carrier; or

Receiving, by the terminal, the at least one DCI on a secondary carrier; or

The terminal receives a partial DCI in the at least one DCI on a primary carrier, and receives, on the secondary carrier, a DCI other than the DCI received on the primary carrier in the at least one DCI.

In a third aspect, a method for transmitting downlink control information DCI is provided, including:

Determining, by the base station, a first DCI to be sent, where the role of the transmit power control TPC domain in the first DCI is power control;

The base station transmits the first DCI on a secondary carrier.

With reference to the third aspect, in a first possible implementation, the first DCI carries a flag bit and/or a downlink assignment index DAI;

The flag is used to indicate that the role of the TPC field in the first DCI is power control; and the DAI is used to indicate that the role of the TPC field in the first DCI is power control.

In conjunction with the first possible implementation of the third aspect, in a second possible implementation, the method further includes:

Determining, by the base station, a second DCI to be sent, where the second DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the TPC domain in the second DCI is power control or resource selection; The DAI is used to indicate that the role of the TPC domain in the second DCI is power control or resource selection;

The base station transmits the second DCI on a secondary carrier.

With reference to the third aspect, or the first or the second possible implementation manner of the third aspect, in a third possible implementation manner, the method further includes:

Determining, by the base station, a third DCI to be sent, where the third DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the transmit power control TPC field in the third DCI is power control or resource Selecting; the DAI is used to indicate that the role of the transmit power control TPC domain in the third DCI is power control or resource selection;

The base station transmits the third DCI on a primary carrier.

A fourth aspect provides a method for receiving downlink control information (DCI), including:

The terminal receives the first DCI sent by the base station on the secondary carrier, where the role of the transmit power control TPC domain in the first DCI is power control;

The terminal performs power control according to the TPC domain.

With reference to the fourth aspect, in a first possible implementation, the first DCI carries a flag bit and/or a DAI;

In conjunction with the first possible implementation of the fourth aspect, in a second possible implementation, the method further includes:

Receiving, by the terminal, the second DCI sent by the base station on the secondary carrier, where the second DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the TPC domain in the second DCI is power Controlling or resource selection; the DAI is used to indicate that the role of the TPC domain in the second DCI is power control or resource selection;

The terminal performs power control or resource selection according to the TPC domain in the second DCI.

With reference to the fourth aspect, or the first or the second possible implementation manner of the fourth aspect, in a third possible implementation manner, the method further includes:

Receiving, by the terminal, the third DCI sent by the base station on the primary carrier, where the third DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the TPC domain in the third DCI is power. Controlling or resource selection; the DAI is used to indicate that the role of the TPC domain in the third DCI is power control or resource selection;

The terminal performs power control or resource selection according to the TPC domain in the third DCI.

In a fifth aspect, a base station is provided, including:

a processing unit, configured to determine at least one DCI to be sent, each of the at least one DCI carrying a flag bit, where the flag bit is used to indicate a role of a transmit power control TPC domain in the DCI to which the DCI belongs;

And a sending unit, configured to send the at least one DCI.

With reference to the fifth aspect, in a first possible implementation manner, the flag bit is used to indicate that the role of the TPC domain in the DCI to which the DCI belongs is power control or resource selection.

With reference to the fifth aspect, or the first possible implementation manner of the fifth aspect, in a second possible implementation manner, the sending unit is specifically configured to:

Transmitting the at least one DCI on a primary carrier; or

Transmitting the at least one DCI on the secondary carrier; or

Transmitting a partial DCI in the at least one DCI on the primary carrier, and transmitting the DCI in the at least one DCI except the DCI transmitted on the primary carrier on the secondary carrier.

In a sixth aspect, a terminal is provided, including:

a receiving unit, configured to receive at least one DCI, where each DCI in the at least one DCI carries a flag bit, where the flag bit is used to indicate a role of a transmit power control TPC domain in the DCI to which the DCI belongs;

a processing unit, configured to determine, according to the flag bit of any one of the DCIs, the role of the TPC field in any one of the DCIs according to any one of the at least one DCI; The role of the TPC domain, the corresponding operation.

With reference to the sixth aspect, in a first possible implementation manner, the flag bit is used to indicate that the role of the TPC domain in the DCI to which the DCI belongs is power control or resource selection;

The processing unit performs the corresponding operation according to the determined role of the TPC field in any one of the DCIs, specifically:

Power control or resource selection is performed according to the determined role of the TPC domain in any one of the DCIs.

With reference to the first possible implementation of the sixth aspect, in a second possible implementation manner, the receiving unit is specifically configured to:

Receiving the at least one DCI on a primary carrier; or

Receiving the at least one DCI on a secondary carrier; or

A partial DCI in the at least one DCI is received on a primary carrier, and other DCIs other than the DCI received on the primary carrier are received in the at least one DCI on the secondary carrier.

In a seventh aspect, a base station is provided, including:

a processing unit, configured to determine a first DCI to be sent, where the role of the transmit power control TPC domain in the first DCI is power control;

And a sending unit, configured to send the first DCI on the secondary carrier.

With reference to the seventh aspect, in a first possible implementation, the first DCI carries a flag bit and/or a downlink assignment index DAI;

With reference to the first possible implementation manner of the seventh aspect, in a second possible implementation, the processing unit is further configured to determine a second DCI to be sent, where the second DCI carries a flag bit and/or Or DAI, the flag bit is used to indicate that the role of the TPC field in the second DCI is power control or resource selection; and the DAI is used to indicate that the role of the TPC domain in the second DCI is power control or resource selection;

The sending unit is further configured to send the second DCI on the secondary carrier.

With reference to the seventh aspect, or the first or the second possible implementation manner of the seventh aspect, in a third possible implementation, the processing unit is further configured to determine a third DCI to be sent, The third DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the transmit power control TPC field in the third DCI is power control or resource selection; and the DAI is used to indicate the third DCI. The role of the transmit power control TPC domain is power control or resource selection;

The sending unit is further configured to send the third DCI on a primary carrier.

In an eighth aspect, a terminal is provided, including:

a receiving unit, configured to receive a first DCI sent by the base station on the secondary carrier, where the role of the transmit power control TPC domain in the first DCI is power control;

And a processing unit, configured to perform power control according to the TPC domain.

With reference to the eighth aspect, in a first possible implementation, the first DCI carries a flag bit and/or a DAI;

With reference to the first possible implementation manner of the eighth aspect, in a second possible implementation, the receiving unit is further configured to: receive, by the base station, a second DCI sent by the base station, where the second DCI is Carrying a flag bit and/or a DAI, the flag bit is used to indicate that the role of the TPC field in the second DCI is power control or resource selection; and the DAI is used to indicate that the role of the TPC domain in the second DCI is Power control or resource selection;

The processing unit is further configured to perform power control or resource selection according to the TPC domain in the second DCI.

With reference to the eighth aspect, or the first or the second possible implementation manner of the eighth aspect, in a third possible implementation, the receiving unit is further configured to receive, by the base station, the primary carrier, a third DCI, where the third DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the TPC field in the third DCI is power control or resource selection; the DAI is used to indicate the The role of the TPC domain in the third DCI is power control or resource selection;

The processing unit is further configured to perform power control or resource selection according to the TPC domain in the third DCI.

A ninth aspect, a system comprising the terminal according to the fifth aspect, or the first or second possible implementation manner of the fifth aspect, and the sixth aspect, or the first aspect of the sixth aspect Or the base station of the second possible implementation.

A tenth aspect, a system comprising the terminal according to the seventh aspect, or the first to third possible implementation manners of the seventh aspect, and the eighth aspect, or the first aspect of the eighth aspect To the base station described in the third possible implementation.

In the embodiment of the present invention, a method, device and system for transmitting DCI are proposed. In this solution, the role of the TPC field in the DCI is indicated by a flag bit in the DCI. At this time, even if the DAI is in the first frequency domain, If the domain is sorted, the primary carrier may also carry the DCI function of the TPC domain as power control.

DRAWINGS

1A is a schematic diagram showing the role of a TPC field in a DCI on a primary carrier and a secondary carrier in an FDD in the prior art. Figure

1B is a schematic diagram of DAI in DCI on a primary carrier and a secondary carrier in a TDD in the prior art;

1C is a schematic diagram of the role of a TPC field in a DCI on a primary carrier and a secondary carrier in a TDD in the prior art;

FIG. 1D is a schematic diagram of sorting DAI in DCI under TDD in the prior art; FIG.

2A is a flowchart of sending a DCI according to an embodiment of the present invention;

FIG. 2B is a schematic diagram showing the role of a TPC field by a flag bit according to an embodiment of the present invention; FIG.

FIG. 3 is a flowchart of receiving DCI according to an embodiment of the present invention;

4A is a flowchart of sending a DCI according to an embodiment of the present invention;

4B is a schematic diagram of a value obtained by performing a modulo operation on a DAI equal to a DAI according to an embodiment of the present invention;

4C is another flowchart of sending a DCI according to an embodiment of the present invention;

FIG. 5A is a schematic diagram of a base station according to an embodiment of the present disclosure;

FIG. 5B is another schematic diagram of a base station according to an embodiment of the present disclosure;

6A is a schematic diagram of a terminal according to an embodiment of the present invention;

FIG. 6B is another schematic diagram of a terminal according to an embodiment of the present disclosure;

FIG. 7A is a schematic diagram of a base station according to an embodiment of the present disclosure;

FIG. 7B is another schematic diagram of a base station according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a terminal according to an embodiment of the present disclosure;

FIG. 8B is another schematic diagram of a terminal according to an embodiment of the present invention.

detailed description

The present invention will be further described in detail with reference to the accompanying drawings, in which FIG. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

"At least one" means one or more. "Multiple" means two or more. "and/or", describing the association relationship of the associated objects, indicating that there may be three relationships, for example, A and/or B, which may indicate that there are three cases where A exists separately, A and B exist at the same time, and B exists separately. The character "/" generally indicates that the contextual object is an "or" relationship.

The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings, and the preferred embodiments of the present invention are intended to illustrate and explain the invention, and not to limit the invention, and The embodiments in the application and the features in the embodiments may be combined with each other.

The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Referring to FIG. 2A, in the embodiment of the present invention, a process for transmitting DCI is as follows:

Step 200: The base station determines at least one DCI to be sent, and each DCI in the at least one DCI carries a flag bit, where the flag bit is used to indicate the role of the TPC domain in the DCI to which the DCI belongs.

Step 210: The base station sends at least one DCI.

Since the current power control of the PUCCH is indicated by the TPC field in the DCI with the DAI of 1 on the primary carrier, that is, the role of the TPC domain is indicated by the DAI, if the DAI follows the pre-frequency domain and the time domain. If the assignment is performed, there will be a case where the DAI of the DCI carried on the primary carrier is not equal to 1. In this case, the terminal cannot perform power control on the PUCCH. In this scheme, the role of the TPC domain in the DCI is no longer passed through the DCI. The DAI indicates, but is indicated by the flag bit in the DCI. At this time, even if the DAI is sorted in the pre-frequency domain and the time domain, the primary carrier can also carry the DCI of the TPC domain as the power control.

For example, the flag bit is 0 to indicate that the role of the TPC field in the DCI is power control, and the flag bit is 1 to indicate that the role of the TPC field in the DCI is resource selection, if the flag bit in the DCI received by the terminal is 0. , determining that the role of the TPC domain in the DCI is power control, if the terminal is connected If the flag bit in the received DCI is 1, it is determined that the role of the TPC field in the DCI is resource selection, so that the terminal no longer determines the role of the TPC domain in the DCI through the DAI in the DCI.

In the embodiment of the present invention, the bit occupied by the flag bit in the DCI is not specifically limited. For example, the original bit in the DCI may be occupied, and the newly added bit in the DCI may also be occupied.

In the embodiment of the present invention, the representation form of the flag bit is not specifically limited. For example, it may be represented by 0, 1, where 1 indicates that the role of the TPC domain is resource selection, and 0 indicates that the role of the TPC domain is power control; or, It is represented by 11, 00, 10, and 01. 01 indicates that the role of the TPC domain is resource selection, and 10 indicates that the role of the TPC domain is power control. Alternatively, it can be represented by 111, 100, 101, and 011, and 101 indicates The role of the TPC domain is resource selection, and 100 indicates that the role of the TPC domain is power control. Of course, there are many other forms of expression, which are not detailed here.

It should be noted that the flag bit used to indicate the role of the TPC in the embodiment of the present invention may be a newly added information field in the DCI information, or may be a redundant information bit in the original DCI, that is, reused in the DCI. The existing information bits are not specifically limited in the present invention.

In the embodiment of the present invention, optionally, the flag bit is used to indicate that the role of the TPC domain in the DCI to which the DCI belongs is power control or resource selection. That is to say, the flag bit may be specifically used to indicate that the role of the TPC domain in the DCI to which it belongs is power control or resource selection.

In the embodiment of the present invention, when the base station sends the at least one DCI, optionally, the following manner may be adopted:

That is, when the base station transmits the DCI of the TPC with the power control indication, the DCI may be all carried on the primary carrier, or may be all carried on the secondary carrier, or partially carried on the primary carrier, and partially carried on the primary carrier. On the carrier.

For example, there are 10 DCIs, and the TPC fields in 10 DCIs are used to indicate power control. The base station can carry all 10 DCIs on the primary carrier, or all 10 DCIs can be carried in the secondary carrier. On the wave, or, 5 DCIs are carried on the primary carrier, and 5 DCIs are carried on the secondary carrier.

In the embodiment of the present invention, at least one DCI includes one DCI or more than one DCI. The above example is described by taking at least one DCI to be transmitted as 10 DCIs. Of course, the DCI to be transmitted may also be a DCI. The TPC field in the DCI is used to indicate the power control. In this case, the base station may carry the DCI on the primary carrier, or the DCI may be carried on the secondary carrier, which is not specifically limited herein.

In addition, in the embodiment of the present invention, the TPC domain in the DCI carried on the primary carrier can be used for power control, and can also be used for resource selection. Similarly, the TPC domain in the DCI carried on the secondary carrier can be used for power. Control can also be used for resource selection.

It should be noted that the TPC domain used for power control may be carried only in one DCI. In addition, in order to ensure the reliability of power control, the TPC domain for power control may also be carried in multiple DCIs.

For example, as shown in FIG. 2B, the flag bit is 0 to indicate that the role of the TPC domain is power control. To ensure the reliability of the power control, the DCI with the flag bit of 0 is provided on the primary carrier and the secondary carrier 1.

Similarly, the TPC domain used for resource selection can be carried in only one DCI. To ensure the reliability of resource selection, the TPC domain that carries the resource selection can be placed in multiple DCIs.

For example, as shown in FIG. 2B, the flag bit 1 is used to indicate that the role of the TPC domain is resource selection. To ensure the reliability of resource selection, the secondary carrier 1 - the secondary carrier 9 has a DCI with a flag bit of 1.

In order to ensure the reliability of power control and/or resource selection, a TPC domain for power control and/or a TPC domain for resource selection may be carried on multiple DCIs.

Referring to FIG. 3, in the embodiment of the present invention, a process for receiving DCI is as follows:

Step 300: The terminal receives at least one DCI, and each DCI in the at least one DCI carries a flag bit, where the flag bit is used to indicate the role of the transmit power control TPC domain in the DCI to which the DCI belongs.

Step 310: Perform, for each DCI in the at least one DCI, the terminal: determining, by the terminal, the role of the TPC field in any one DCI according to the flag of any DCI;

Step 320: The terminal performs a corresponding operation according to the determined role of the TPC domain in any DCI.

Since the terminal is currently determining the role of the TPC domain in the received DCI, it is referred to by DAI. As shown, for example, the TPC domain is used for power control by indicating that the DAI is 1. If the DAI is assigned according to the pre-frequency domain and the time domain, the DAI of the DCI carried on the primary carrier is not equal to 1. At this time, the base station cannot issue a command for power control of the PUCCH. In this solution, the role of the TPC field in the DCI is no longer indicated by the DAI in the DCI, but is indicated by the flag bit in the DCI. At this time, even if the DAI is sorted in the pre-frequency domain and the time domain, and the DCI carried by the primary carrier does not include DAI, the terminal can also determine which DCCs in the DCI function as power control, and solve the problem. The drawbacks of power control cannot be performed in the prior art.

For example, the flag bit is 0 to indicate that the role of the TPC field in the DCI is power control, and the flag bit is 1 to indicate that the role of the TPC field in the DCI is resource selection, if the flag bit in the DCI received by the terminal is 0. And determining that the role of the TPC field in the DCI is power control. If the flag bit in the DCI received by the terminal is 1, determining that the role of the TPC field in the DCI is resource selection, so that the terminal is no longer through the DCI. The DAI in the middle determines the role of the TPC domain in the DCI.

In the embodiment of the present invention, optionally, the flag bit is used to indicate that the role of the TPC domain in the DCI to which the DCI belongs is power control or resource selection.

In this case, when the terminal performs the corresponding operation according to the determined role of the TPC field in any one of the DCIs, the terminal may be selected as follows:

The terminal performs power control or resource selection according to the determined role of the TPC field in any DCI.

In the embodiment of the present invention, when the terminal receives at least one DCI, the following manner may be adopted:

The terminal receives at least one DCI on the primary carrier; or

The terminal receives at least one DCI on the secondary carrier; or

The terminal receives a partial DCI in at least one DCI on the primary carrier, and receives at least one DCI on the secondary carrier other than the DCI received on the primary carrier.

That is to say, when the terminal receives the DCI, the received DCIs are all carried on the primary carrier, or all of them are carried on the secondary carrier, or partially carried on the primary carrier, and partially carried on the secondary carrier.

For example, there are 10 DCIs, and the TPC fields in 10 DCIs are used to indicate power control. All 10 DCIs are carried on the primary carrier, or 10 DCIs are all carried on the secondary carrier, or 5 DCIs. The bearer is carried on the primary carrier, and the five DCIs are carried on the secondary carrier.

In the embodiment of the present invention, the TPC domain in the DCI carried on the primary carrier can be used for power control, and can also be used for resource selection. Similarly, the TPC domain in the DCI carried on the secondary carrier can be used for power control. Can also be used for resource selection.

It should be noted that the TPC domain for power control and/or the TPC domain for resource selection may be carried on one DCI. To ensure the reliability of power control and/or resource selection, the TPC for power control may be used. A domain and/or a TPC domain for resource selection can be carried on multiple DCIs.

For example, as shown in FIG. 2B, the flag bit 0 is used to indicate that the role of the TPC domain is power control. To ensure the reliability of the power control, the DCI with the flag bit of 0 is provided on the primary carrier and the secondary carrier 1.

For example, as shown in FIG. 2B, the flag bit 1 is used to indicate that the role of the TPC domain is resource selection. To ensure the reliability of resource selection, the secondary carrier 1 - the secondary carrier 9 has a DCI with a flag bit of 1. .

The foregoing description is to indicate the role of the TPC domain in the DCI by using the identifier bit. In the embodiment of the present invention, a method for performing power control by using the secondary carrier is also proposed to solve the problem in the prior art. Defects in power control.

Referring to FIG. 4A, in the embodiment of the present invention, a process for transmitting DCI is as follows:

Step 400: The base station determines a first DCI to be sent, and the role of the TPC domain in the first DCI is power control.

Step 410: The base station sends the first DCI on the secondary carrier.

In the prior art, the TPC domain used for power control is only carried in the DCI of the primary carrier. Specifically, the TPC domain in the DCI with the DAI of 1 on the primary carrier functions as power control, but the DAI is the pre-frequency domain and the time domain. In this case, the DCI with DAI of 1 may be carried on the secondary carrier, so that there is a defect that power control cannot be performed. In this solution, the role of the TPC domain of the DCI carried on the secondary carrier may also be power control, therefore, the solution is There is a drawback in the prior art that power control cannot be performed.

The above description is that the role of the TPC domain of the DCI on the secondary carrier is power control. In this manner, which method can be used to distinguish whether the role of the TPC domain is power control or resource selection, and may be through the first DCI. Carrying a flag and/or DAI;

The above description is that the role of the TPC domain of the DCI on the secondary carrier is power control. Further, the role of the TPC domain of the DCI on the secondary carrier may also be resource selection, or, further, in order to ensure the reliability of resource selection, The role of the TPC domain of multiple DCIs on the carrier may also be a resource selection. Therefore, in the embodiment of the present invention, the following manner is also included:

The base station determines a second DCI to be sent, where the second DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the TPC field in the second DCI is power control or resource selection; and the DAI is used to indicate the TPC in the second DCI. The role of the domain is power control or resource selection;

The base station transmits a second DCI on the secondary carrier.

The above description is that the role of the TPC field in the DCI carried on the secondary carrier is power control or resource selection. Further, the DCI including the TPC domain for power control or resource selection may also be carried on the primary carrier, and includes the following operating:

The base station determines a third DCI to be sent, where the third DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the TPC field in the third DCI is power control or resource selection; and the DAI is used to indicate the TPC in the third DCI. The role of the domain is power control or resource selection;

The base station transmits a third DCI on the primary carrier.

It should be noted that when the role of the TPC domain is indicated by the DAI, it may be the actual sorting value of the DAI. In order to improve the utilization of the resource and reduce the number of bits occupied by the DAI, the DAI may be the actual DAI sorting value. The value after the modulo operation.

For example, when DAI is a sort value for DAI, such as 1, 2, 3, 4, 5, 6, 7, ..., 64, at this time, DAI needs 6 bits to represent, and the number of occupied bits is compared. Large, in order to reduce the number of bits occupied by DAI, the DAI sort value can be modulo operation, and the modulo operation value is taken as the DAI value. For example, the formula of the modulo operation can be DAI value = (original DAI count value) -1) mod 4+1, DAI becomes 1, 2, 3, 4, 1, 2, 3, 4, ..., 4, DAI only needs 2 bits to represent, reducing the bit occupied by DAI The number increases the utilization of resources, as shown in Figure 4B.

It should be noted that when the DAI value is the value after the modulo operation, multiple identical DAI values may appear. If DAI=1 is used to indicate that the TPC field in the DCI is used for power control, the power control command may be placed on the TPC domain of multiple DCIs with DAI=1, or it may be pre-specified only in one or several DAI= The power control command of the TPC of the DCI of 1 can be put, and the other TPC domain can put the resource indication information.

Referring to FIG. 4C, in the embodiment of the present invention, a process for receiving DCI is as follows:

Step 4000: The terminal receives the first DCI sent by the base station on the secondary carrier, and the TPC in the first DCI. The role of the domain is power control;

Step 4100: The terminal performs power control according to the TPC domain.

In the prior art, the TPC domain used for power control is only carried in the DCI on the primary carrier. Specifically, the TPC domain in the DCI with the DAI of 1 on the primary carrier functions as power control, but the DAI is the first frequency domain. In the case of a domain, the DCI with a DAI of 1 may be carried on the secondary carrier, so that there is a defect that power control cannot be performed. In this solution, the role of the TPC domain of the DCI carried on the secondary carrier may also be power control. The drawbacks of the prior art that cannot be controlled by power are solved.

The above description is that the role of the TPC domain of the DCI on the secondary carrier is power control. Further, the role of the TPC domain of the DCI on the secondary carrier may also be resource selection, or, further, in order to ensure the reliability of resource selection, The function of the TPC domain of multiple DCIs on the carrier may also be a resource selection. In the embodiment of the present invention, the method further includes the following operations:

The terminal receives the second DCI sent by the base station on the secondary carrier, where the second DCI carries the flag bit and/or the DAI, and the flag bit is used to indicate that the role of the TPC field in the second DCI is power control or resource selection; The role of the TPC domain in the second DCI is power control or resource selection;

The foregoing description is that the role of the TPC field in the DCI carried on the secondary carrier is power control or resource selection. Further, the DCI including the TPC domain for power control or resource selection may also be carried on the primary carrier, which is implemented by the present invention. In the example, the method further includes the following operations:

The terminal receives the third DCI sent by the base station on the primary carrier, where the third DCI carries the flag bit and/or the DAI, and the flag bit is used to indicate that the role of the TPC domain in the third DCI is power control or resource selection; The role of the TPC domain in the three DCIs is power control or resource selection;

Referring to FIG. 5A, in the embodiment of the present invention, a base station is provided, where the base station includes a processing unit 50 and a sending unit 51, where:

The processing unit 50 is configured to determine at least one DCI to be sent, where each DCI in the at least one DCI carries a flag bit, where the flag bit is used to indicate the role of the transmit power control TPC domain in the DCI to which the DCI belongs;

The sending unit 51 is configured to send at least one DCI.

Optionally, the flag bit is used to indicate that the role of the TPC field in the DCI to which the DCI belongs is power control or resource selection.

Optionally, the sending unit 51 is specifically configured to:

Transmitting at least one DCI on the primary carrier; or

Sending at least one DCI on the secondary carrier; or

A partial DCI in at least one DCI is transmitted on the primary carrier, and other DCIs other than the DCI transmitted on the primary carrier are transmitted in the at least one DCI on the secondary carrier.

Referring to FIG. 5B, in the embodiment of the present invention, a base station is provided, where the base station includes a processor 500 and a transmitter 510, where:

The processor 500 is configured to determine at least one DCI to be sent, where each DCI in the at least one DCI carries a flag bit, where the flag bit is used to indicate a role of the transmit power control TPC domain in the DCI to which the DCI belongs;

The transmitter 510 is configured to send at least one DCI.

Optionally, the transmitter 510 is specifically configured to:

Transmitting at least one DCI on the primary carrier; or

Sending at least one DCI on the secondary carrier; or

Referring to FIG. 6A, in the embodiment of the present invention, a terminal is provided, where the terminal includes a receiving unit 60 and a processing unit 61, where:

The receiving unit 60 is configured to receive at least one DCI, where each DCI in the at least one DCI carries a flag bit, where the flag bit is used to indicate a role of the transmit power control TPC domain in the DCI to which the DCI belongs;

The processing unit 61 is configured to perform, according to any one of the at least one DCI, the role of the TPC field in any one of the DCIs according to the flag of any one of the DCIs, and perform the function according to the determined role of the TPC field in any one of the DCIs. The corresponding operation.

Optionally, the flag bit is used to indicate that the TPC domain in the DCI belongs to the power control or resource. select;

The processing unit 61 performs the corresponding operation according to the determined role of the TPC field in any one of the DCIs, specifically:

Power control or resource selection is performed according to the determined role of the TPC field in any DCI.

Optionally, the receiving unit 60 is specifically configured to:

Receiving at least one DCI on the primary carrier; or

Receiving at least one DCI on the secondary carrier; or

A partial DCI in at least one DCI is received on the primary carrier, and other DCIs other than the DCI received on the primary carrier are received in the at least one DCI on the secondary carrier.

Referring to FIG. 6B, in the embodiment of the present invention, a terminal is provided, where the terminal includes a receiver 600 and a processor 610, where:

The receiver 600 is configured to receive at least one DCI, where each DCI in the at least one DCI carries a flag bit, where the flag bit is used to indicate a role of the transmit power control TPC domain in the DCI to which the DCI belongs;

The processor 610 is configured to perform, according to any one of the at least one DCI, the role of the TPC field in any one of the DCIs according to the flag of any one of the DCIs, and perform the function according to the determined role of the TPC field in any one of the DCIs. The corresponding operation.

Optionally, the flag bit is used to indicate that the role of the TPC domain in the DCI to which the DCI belongs is power control or resource selection;

The processor 610 performs the corresponding operations according to the determined role of the TPC field in any one of the DCIs, specifically:

Optionally, the receiver 600 is specifically configured to:

Receiving at least one DCI on the primary carrier; or

Receiving at least one DCI on the secondary carrier; or

Referring to FIG. 7A, in the embodiment of the present invention, a base station is provided, where the base station includes a processing unit. 70 and transmitting unit 71, wherein:

The processing unit 70 is configured to determine a first DCI to be sent, where the role of the transmit power control TPC domain in the first DCI is power control;

The sending unit 71 is configured to send the first DCI on the secondary carrier.

Optionally, the first DCI carries a flag bit and/or a downlink assignment index DAI;

Further, the processing unit 70 is further configured to: determine a second DCI to be sent, where the second DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the TPC domain in the second DCI is power control or resource selection; The DAI is used to indicate that the role of the TPC domain in the second DCI is power control or resource selection;

The sending unit 71 is further configured to send the second DCI on the secondary carrier.

Further, the processing unit 70 is further configured to: determine a third DCI to be sent, where the third DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the transmit power control TPC field in the third DCI is power control or Resource selection; DAI is used to indicate that the role of the transmit power control TPC domain in the third DCI is power control or resource selection;

The sending unit 71 is further configured to send the third DCI on the primary carrier.

Referring to FIG. 7B, in the embodiment of the present invention, a base station is provided, where the base station includes a processor 700 and a transmitter 710, where:

The processor 700 is configured to determine a first DCI to be sent, where the role of the transmit power control TPC domain in the first DCI is power control;

The transmitter 710 is configured to send the first DCI on the secondary carrier.

Further, the processor 700 is further configured to: determine a second DCI to be sent, where the second DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the TPC domain in the second DCI is power control or Resource selection; DAI is used to indicate that the role of the TPC domain in the second DCI is power control or resource selection;

The transmitter 710 is further configured to send the second DCI on the secondary carrier.

Further, the processor 700 is further configured to: determine a third DCI to be sent, where the third DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the transmit power control TPC field in the third DCI is power control or Resource selection; DAI is used to indicate that the role of the transmit power control TPC domain in the third DCI is power control or resource selection;

The transmitter 710 is further configured to send the third DCI on the primary carrier.

Referring to FIG. 8A, in the embodiment of the present invention, a terminal is provided, where the terminal includes a receiving unit 80 and a processing unit 81, where:

The receiving unit 80 is configured to receive a first DCI sent by the base station on the secondary carrier, where the transmit power control TPC domain in the first DCI functions as power control;

The processing unit 81 is configured to perform power control according to the TPC domain.

Optionally, the first DCI carries a flag bit and/or a DAI;

Further, the receiving unit 80 is further configured to: receive a second DCI sent by the base station on the secondary carrier, where the second DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the TPC domain in the second DCI is power control. Or resource selection; the DAI is used to indicate that the role of the TPC domain in the second DCI is power control or resource selection;

The processing unit 81 is further configured to perform power control or resource selection according to the TPC domain in the second DCI.

Further, the receiving unit 80 is further configured to: receive a third DCI sent by the base station on the primary carrier, where the third DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the TPC domain in the third DCI is power control. Or resource selection; DAI is used to indicate that the role of the TPC domain in the third DCI is power control or resource selection;

The processing unit 81 is further configured to perform power control or resources according to the TPC domain in the third DCI. select.

Referring to FIG. 8B, in the embodiment of the present invention, a terminal is provided, where the terminal includes a receiver 800 and a processor 810, where:

The receiver 800 is configured to receive a first DCI sent by the base station on the secondary carrier, where the transmit power control TPC domain in the first DCI functions as power control;

The processor 810 is configured to perform power control according to the TPC domain.

Optionally, the first DCI carries a flag bit and/or a DAI;

Further, the receiver 800 is further configured to: receive a second DCI sent by the base station on the secondary carrier, where the second DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the TPC domain in the second DCI is power control. Or resource selection; the DAI is used to indicate that the role of the TPC domain in the second DCI is power control or resource selection;

The processor 810 is further configured to perform power control or resource selection according to the TPC domain in the second DCI.

Further, the receiver 800 is further configured to: receive a third DCI sent by the base station on the primary carrier, where the third DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the TPC domain in the third DCI is power control. Or resource selection; DAI is used to indicate that the role of the TPC domain in the third DCI is power control or resource selection;

The processor 810 is further configured to perform power control or resource selection according to the TPC domain in the third DCI.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

The present invention is directed to a method, apparatus (system), and computer program according to an embodiment of the present invention. The flow chart and/or block diagram of the product is described. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those skilled in the < Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the invention without departing from the spirit and scope of the embodiments of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the embodiments of the invention.

Claims

A method for transmitting downlink control information DCI, comprising:

Determining, by the base station, at least one DCI to be sent, each of the at least one DCI carrying a flag bit, where the flag bit is used to indicate a role of a transmit power control TPC domain in the DCI to which the DCI belongs;

The base station transmits the at least one DCI.
The method according to claim 1, wherein the flag bit is used to indicate that the role of the TPC domain in the DCI to which it belongs is power control or resource selection.
The method according to claim 1 or 2, wherein the transmitting, by the base station, the at least one DCI comprises:

Transmitting, by the base station, the at least one DCI on a primary carrier; or

Transmitting the at least one DCI on the secondary carrier of the base station; or

The base station transmits a partial DCI in the at least one DCI on a primary carrier, and transmits a DCI other than the DCI transmitted on the primary carrier in the at least one DCI on the secondary carrier.
A method for receiving downlink control information (DCI), comprising:

Receiving, by the terminal, at least one DCI, where each DCI in the at least one DCI carries a flag bit, where the flag bit is used to indicate a role of a transmit power control TPC domain in the DCI to which the DCI belongs;

For any one of the at least one DCI, respectively performing:

Determining, by the terminal, the role of the TPC field in any one of the DCIs according to the flag of any one of the DCIs;

The terminal performs a corresponding operation according to the determined role of the TPC domain in any one of the DCIs.
The method according to claim 4, wherein the flag bit is used to indicate that the role of the TPC domain in the DCI to which the DCI belongs is power control or resource selection;

The terminal performs a corresponding operation according to the determined role of the TPC domain in any one of the DCIs, including:

The terminal performs power control or resource selection according to the determined role of the TPC domain in any one of the DCIs.
The method according to claim 4 or 5, wherein the terminal receives the at least one DCI, including:

Receiving, by the terminal, the at least one DCI on a primary carrier; or

Receiving, by the terminal, the at least one DCI on a secondary carrier; or

The terminal receives a partial DCI in the at least one DCI on a primary carrier, and receives, on the secondary carrier, a DCI other than the DCI received on the primary carrier in the at least one DCI.
A method for transmitting downlink control information DCI, comprising:

Determining, by the base station, a first DCI to be sent, where the role of the transmit power control TPC domain in the first DCI is power control;

The base station transmits the first DCI on a secondary carrier.
The method according to claim 7, wherein the first DCI carries a flag bit and/or a downlink assignment index DAI;

The flag is used to indicate that the role of the TPC field in the first DCI is power control; and the DAI is used to indicate that the role of the TPC field in the first DCI is power control.
The method of claim 8 wherein the method further comprises:

Determining, by the base station, a second DCI to be sent, where the second DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the TPC domain in the second DCI is power control or resource selection; The DAI is used to indicate that the role of the TPC domain in the second DCI is power control or resource selection;

The base station transmits the second DCI on a secondary carrier.
The method of any of claims 7-9, wherein the method further comprises:

Determining, by the base station, a third DCI to be sent, where the third DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the transmit power control TPC field in the third DCI is power control or resource Selecting; the DAI is used to indicate that the role of the transmit power control TPC domain in the third DCI is power control or resource selection;

The base station transmits the third DCI on a primary carrier.
A method for receiving downlink control information (DCI), comprising:

The terminal receives the first DCI sent by the base station on the secondary carrier, where the role of the transmit power control TPC domain in the first DCI is power control;

The terminal performs power control according to the TPC domain.
The method according to claim 11, wherein the first DCI carries a flag bit and/or a DAI;

The flag is used to indicate that the role of the TPC field in the first DCI is power control; and the DAI is used to indicate that the role of the TPC field in the first DCI is power control.
The method of claim 12, wherein the method further comprises:

Receiving, by the terminal, the second DCI sent by the base station on the secondary carrier, where the second DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the TPC domain in the second DCI is power Controlling or resource selection; the DAI is used to indicate that the role of the TPC domain in the second DCI is power control or resource selection;

The terminal performs power control or resource selection according to the TPC domain in the second DCI.
The method of any of claims 11-13, wherein the method further comprises:

Receiving, by the terminal, the third DCI sent by the base station on the primary carrier, where the third DCI carries a flag bit and/or a DAI, where the flag bit is used to indicate that the role of the TPC domain in the third DCI is power. Controlling or resource selection; the DAI is used to indicate that the role of the TPC domain in the third DCI is power control or resource selection;

The terminal performs power control or resource selection according to the TPC domain in the third DCI.
A base station, comprising:

a processing unit, configured to determine at least one DCI to be sent, each of the at least one DCI carrying a flag bit, where the flag bit is used to indicate a role of a transmit power control TPC domain in the DCI to which the DCI belongs;

And a sending unit, configured to send the at least one DCI.
The base station according to claim 15, wherein the flag bit is used to indicate that the role of the TPC domain in the DCI to which it belongs is power control or resource selection.
The base station according to claim 15 or 16, wherein the transmitting unit is specific Used for:

Transmitting the at least one DCI on a primary carrier; or

Transmitting the at least one DCI on the secondary carrier; or

Transmitting a partial DCI in the at least one DCI on the primary carrier, and transmitting the DCI in the at least one DCI except the DCI transmitted on the primary carrier on the secondary carrier.
A terminal, comprising:

a receiving unit, configured to receive at least one DCI, where each DCI in the at least one DCI carries a flag bit, where the flag bit is used to indicate a role of a transmit power control TPC domain in the DCI to which the DCI belongs;

a processing unit, configured to determine, according to the flag bit of any one of the DCIs, the role of the TPC field in any one of the DCIs according to any one of the at least one DCI; The role of the TPC domain, the corresponding operation.
The terminal according to claim 18, wherein the flag bit is used to indicate that the role of the TPC domain in the DCI to which the DCI belongs is power control or resource selection;

The processing unit performs the corresponding operation according to the determined role of the TPC field in any one of the DCIs, specifically:

Power control or resource selection is performed according to the determined role of the TPC domain in any one of the DCIs.
The terminal according to claim 18 or 19, wherein the receiving unit is specifically configured to:

Receiving the at least one DCI on a primary carrier; or

Receiving the at least one DCI on a secondary carrier; or

A partial DCI in the at least one DCI is received on a primary carrier, and other DCIs other than the DCI received on the primary carrier are received in the at least one DCI on the secondary carrier.
A base station, comprising:

a processing unit, configured to determine a first DCI to be sent, where the role of the transmit power control TPC domain in the first DCI is power control;

And a sending unit, configured to send the first DCI on the secondary carrier.
The base station according to claim 21, wherein the first DCI carries a flag bit and/or a downlink assignment index DAI;

The flag is used to indicate that the role of the TPC field in the first DCI is power control; and the DAI is used to indicate that the role of the TPC field in the first DCI is power control.
The base station according to claim 22, wherein the processing unit is further configured to determine a second DCI to be sent, where the second DCI carries a flag bit and/or a DAI, and the flag bit is used to indicate The role of the TPC field in the second DCI is power control or resource selection; the DAI is used to indicate that the role of the TPC domain in the second DCI is power control or resource selection;

The sending unit is further configured to send the second DCI on the secondary carrier.
The base station according to any one of claims 21 to 23, wherein the processing unit is further configured to: determine a third DCI to be sent, where the third DCI carries a flag bit and/or a DAI, The flag is used to indicate that the role of the transmit power control TPC field in the third DCI is power control or resource selection; and the DAI is used to indicate that the role of the transmit power control TPC field in the third DCI is power control or resource selection. ;

The sending unit is further configured to send the third DCI on a primary carrier.
A terminal, comprising:

a receiving unit, configured to receive a first DCI sent by the base station on the secondary carrier, where the role of the transmit power control TPC domain in the first DCI is power control;

And a processing unit, configured to perform power control according to the TPC domain.
The terminal according to claim 25, wherein the first DCI carries a flag bit and/or a DAI;

The flag is used to indicate that the role of the TPC field in the first DCI is power control; and the DAI is used to indicate that the role of the TPC field in the first DCI is power control.
The terminal according to claim 26, wherein the receiving unit is further configured to receive a second DCI sent by the base station on a secondary carrier, where the second DCI carries a flag bit and/or a DAI. The flag bit is used to indicate that the role of the TPC field in the second DCI is power control or resource selection; the DAI is used to indicate that the role of the TPC domain in the second DCI is power control or resource Source selection

The processing unit is further configured to perform power control or resource selection according to the TPC domain in the second DCI.
The terminal according to any one of claims 25 to 27, wherein the receiving unit is further configured to receive a third DCI sent by the base station on a primary carrier, where the third DCI carries a flag bit and And the DAI, the flag is used to indicate that the role of the TPC field in the third DCI is power control or resource selection; and the DAI is used to indicate that the role of the TPC domain in the third DCI is power control or resource selection. ;

The processing unit is further configured to perform power control or resource selection according to the TPC domain in the third DCI.