WO2014117391A1

WO2014117391A1 - Data transmission method, base station, and user equipment

Info

Publication number: WO2014117391A1
Application number: PCT/CN2013/071277
Authority: WO
Inventors: 张健; 曾清海
Original assignee: 华为技术有限公司
Priority date: 2013-02-01
Filing date: 2013-02-01
Publication date: 2014-08-07
Also published as: CN104321997A; CN104321997B

Abstract

The present invention provides a data transmission method, a base station, and a user equipment. The method comprises: when inter-base station carrier aggregation is performed on a first base station that provides an auxiliary serving cell and a second base station that provides a main serving cell, the first base station or the second base station sending first data to a user equipment on a physical downlink shared channel (PDSCH); and determining whether to perform HARQ retransmission on the first data according to a scheduling policy. Therefore, the problem that the user equipment cannot send an HARQ feedback on a physical uplink control channel (PUCCH) of the first base station and a PUCCH of the second base station simultaneously can be solved, and the base station can effectively support HARQ operation for inter-base station carrier aggregation.

Description

Method for transmitting data, base station and user equipment

Embodiments of the present invention relate to the field of communications technologies, and, more particularly, to a method, a base station, and a user equipment for transmitting data. Background technique

In the case of performing carrier aggregation between the base station providing the primary serving cell and the base station providing the secondary serving cell, the base station providing the primary serving cell and the base station providing the secondary serving cell may not be able to simultaneously provide the physical uplink control channel (Physical Uplink Control Channel, PUCCH). ). Alternatively, even if the base station providing the primary serving cell and the base station providing the secondary serving cell can simultaneously provide the PUCCH, the user equipment cannot simultaneously send the hybrid automatic repeat request in the PUCCH of the primary serving cell and the PUCCH of the secondary serving cell (Hybrid Automatic Repeat Request) , HARQ) Feedback

(Send positive feedback or negative feedback).

Therefore, in the conventional technology, the base station cannot perform effectively when performing inter-base station carrier aggregation.

HARQ operation. Summary of the invention

The present invention provides a method for transmitting data, a base station, and a user equipment, so that the base station can effectively perform HARQ operation when performing inter-base station carrier aggregation.

In a first aspect, the present invention provides a method for transmitting data, which is performed by a first base station providing a secondary serving cell or a second base station providing a primary serving cell, where the first base station and the second base station perform carrier aggregation between base stations. , including:

And transmitting the first data to the user equipment on the physical downlink shared channel PDSCH; determining, according to the scheduling policy, whether the hybrid automatic repeat request HARQ retransmission is performed on the first data.

With reference to the first aspect, in a first possible implementation manner, determining whether to perform HARQ retransmission on the first data according to the scheduling policy includes:

Always performing HARQ retransmission; or never performing HARQ retransmission; or determining whether to perform HARQ retransmission according to the channel quality indication CQI sent by the user equipment or the error rate of receiving the radio link control RLC protocol data unit PDU; The first HARQ feedback information sent by the user equipment, determining whether to perform HARQ retransmission, where the first HARQ feedback information Corresponding to the first data.

With the first possible implementation, in a second possible implementation, where the method is performed by the first base station, the method further includes:

Determining at least two buffers for the first downlink HARQ process, where the first downlink HARQ process corresponds to the first data, where the sending the first data to the user equipment on the physical downlink shared channel PDSCH includes: using the The first buffer of the at least two buffers sends the first data to the user equipment on the PDSCH, where, according to the first HARQ feedback information sent by the user equipment, determining whether to perform HARQ retransmission on the first data, The method includes: performing HARQ retransmission or sending of the first data by using the first buffer according to the first HARQ feedback information, when receiving the first HARQ feedback information sent by the user equipment by using the second base station New data,

The method also includes:

If the one or more HARQ loopback times RTT after the first data is sent does not receive the first HARQ feedback information sent by the user equipment by using the second base station, the at least two buffers are used. The second buffer sends new data.

With reference to the first possible implementation manner, in a third possible implementation, when determining whether to perform HARQ retransmission according to the first HARQ feedback information sent by the user equipment, on the physical downlink shared channel PDSCH Before the user equipment sends the first data, the method further includes:

Sending, to the user equipment, a handover indication, where the handover indication is used to indicate that the user equipment sends the HARQ feedback information corresponding to the data sent by the first base station or the uplink resource transmission corresponding to the second base station by using the uplink resource of the first base station HARQ feedback information of data transmitted by the second base station.

With reference to the first aspect, in a fourth possible implementation, before the first data is sent to the user equipment on the physical downlink shared channel PDSCH, the method further includes:

Sending a retransmission indication to the user equipment, the retransmission indication is used to indicate that the user equipment does not need to send the first HARQ feedback information, where the first HARQ feedback information corresponds to the first data.

With reference to the first possible implementation manner, in a fifth possible implementation manner, when determining whether to perform HARQ retransmission according to the first HARQ feedback information sent by the user equipment, the physical downlink shared channel PDSCH Before the first data is sent to the user equipment, the method further includes: The cell configuration information is sent to the user equipment, where the cell configuration information is used to indicate that the user equipment sends the first HARQ feedback information by using a PUCCH of the secondary serving cell.

With reference to the first aspect or any of the foregoing possible implementation manners, in a sixth possible implementation manner, in a case of determining to perform HARQ retransmission, the method further includes:

Transmitting new data to the user equipment; performing the HARQ retransmission on the first data in the next subframe in which the new data is transmitted.

In combination with the sixth possible implementation, in the seventh possible implementation,

HARQ retransmission, including:

The HARQ retransmission is performed on the first data using the same resource and modulation and coding scheme as transmitting the new data.

In a second aspect, the present invention provides a method for transmitting data, including:

Receiving, by the base station, first data sent by the physical downlink shared channel PDSCH; receiving a redundancy version of the first data that the base station performs hybrid automatic repeat request HARQ retransmission according to the scheduling policy, or receiving new data sent by the base station according to the scheduling policy The base station is a first base station providing a secondary serving cell or a second base station providing a primary serving cell, and the first base station and the second base station perform carrier aggregation between the base stations.

With reference to the second aspect, in a first possible implementation, before receiving the first data sent by the base station on the physical downlink shared channel PDSCH, the method further includes:

Receiving a retransmission indication sent by the base station, where the retransmission indication is used to indicate that the user equipment does not need to send the first HARQ feedback information, where the first HARQ feedback information corresponds to the first data.

In combination with the second aspect or the first possible implementation manner, in a second possible implementation manner, the method further includes:

A channel quality indication CQI is sent to the base station, so that the base station determines whether to perform HARQ retransmission according to the CQI.

With reference to the second aspect, in a third possible implementation, before receiving the redundancy version of the first data that the base station performs the hybrid automatic repeat request HARQ retransmission, or receiving the new data sent by the base station, the method Also includes:

Determining whether the first data is successfully received. If the base station has available uplink resources, the first HARQ feedback information is sent to the base station by using the available uplink resource, where the first HARQ feedback information corresponds to the first data.

In conjunction with the third possible implementation, in a fourth possible implementation, the base is received Before the first data sent by the physical downlink shared channel PDSCH, the method further includes: receiving cell configuration information sent by the base station, where the cell configuration information is used to indicate that the user equipment sends the first HARQ by using a PUCCH of the secondary serving cell Feedback.

With the fourth possible implementation, in a fifth possible implementation, where the base station is the first base station, the method further includes:

Receiving, by the base station, the first data sent by the base station on the PDSCH, using the PUCCH of the base station to send the first HARQ feedback information; and receiving the data sent by the second base station on the PDSCH, switching to Transmitting the second HARQ feedback information by using the PUCCH of the second base station, where the second HARQ feedback information corresponds to data sent by the second base station; after the second base station's PUCCH sends the second HARQ feedback information, switching back to use The PUCCH of the base station transmits HARQ feedback information corresponding to data transmitted by the base station.

With reference to the second aspect, in a sixth possible implementation, where the base station is the first base station, the method further includes:

Determining at least two buffers for the first downlink HARQ process, the first buffer in the at least two buffers storing the first data, where the first downlink HARQ process corresponds to the first data; Successfully receiving the first data; transmitting the first HARQ feedback information to the second base station, so that the second base station forwards the first HARQ feedback information to the base station, where the first HARQ feedback information corresponds to the first data; Receiving a redundancy version of the first data that is sent by the base station for HARQ retransmission, processing a redundancy version of the first data in the first buffer, and receiving new data sent by the base station, in the first buffer Or processing the new data in a second buffer of the at least two buffers.

With reference to the second aspect, in a seventh possible implementation, before the receiving, by the base station, the first data that is sent by the base station to the shared channel PDSCH, the method further includes:

Receiving a handover indication sent by the base station, where the handover indication is used to indicate that the user equipment sends the HARQ feedback information corresponding to the data sent by the first base station or the uplink resource transmission corresponding to the second base station by using the uplink resource of the first base station The HARQ feedback information of the data sent by the second base station, according to the handover indication, the HARQ feedback information corresponding to the data sent by the first base station is sent by using the uplink resource of the first base station, or the uplink resource is sent by using the second base station. Corresponding to HARQ feedback information of data transmitted by the second base station.

In a third aspect, the present invention provides a base station, where the base station is a first base station that provides a secondary serving cell, or the base station is a second base station that provides a primary serving cell, and includes: And a sending unit, configured to send the first data to the user equipment on the physical downlink shared channel PDSCH; and the control unit is configured to determine, according to the scheduling policy, whether to perform hybrid automatic repeat request HARQ retransmission on the first data.

With reference to the third aspect, in a first possible implementation, the base station further includes: a receiving unit, configured to receive a channel quality indicator CQI, an error rate of a radio link control RLC protocol data unit PDU, or a number sent by the user equipment a HARQ feedback information, where the first HARQ feedback information corresponds to the first data; the control unit is specifically configured to determine whether to perform hybrid automatic weight according to the CQI, an error rate of the RLC PDU, or the first HARQ feedback information. Request a HARQ retransmission.

With reference to the third aspect, in a second possible implementation, the control unit is specifically configured to perform HARQ retransmission; or the control unit is specifically configured to perform HARQ retransmission.

In conjunction with the first possible implementation, in a third possible implementation, where the base station is the first base station that provides the secondary serving cell, the control unit is further configured to determine, for the first downlink HARQ process. At least two buffers, where the first downlink HARQ process corresponds to the first data; the sending unit is configured to send, by using the first buffer in the at least two buffers, the user equipment on the PDSCH The first data; the receiving unit is configured to receive the first HARQ feedback information sent by the user equipment by using the second base station; the control unit is further configured to determine, according to the first HARQ feedback information, use the first buffer The area performs HARQ retransmission or sends new data; the control unit is further configured to expire at one or more loopback times RTT after the sending unit sends the first data, and the receiving unit does not receive the second base station to send In the case of the first HARQ feedback information, determining to use the second buffer in the at least two buffers to send new data; the sending unit is further used for A first buffer data of the first transmission redundancy version, or using the first buffer or the second buffer to transmit the new data.

In conjunction with the first possible implementation, in a fourth possible implementation, the sending unit is further configured to send a handover indication to the user equipment.

In combination with the third aspect, the first possible implementation manner, or the second possible implementation manner, in a fifth possible implementation manner, the sending unit is further configured to send a retransmission indication to the user equipment.

In conjunction with the first possible implementation, in a sixth possible implementation, the sending unit is further configured to send cell configuration information to the user equipment.

With the third aspect or any of the foregoing possible implementation manners, in the seventh possible implementation manner, in a case where the control unit determines to perform the HARQ retransmission, the sending unit specifically uses The new data is sent to the user equipment, and the HARQ retransmission is performed in the next subframe in which the new data is transmitted.

With reference to the seventh possible implementation manner, in the eighth possible implementation, the sending unit is specifically configured to perform the HARQ retransmission using the same resource and modulation and coding manner as the new data is sent.

In a fourth aspect, the present invention provides a user equipment, including:

a first receiving unit, configured to receive first data that is sent by the base station on the physical downlink shared channel PDSCH; and a second receiving unit, configured to receive, by the base station, the redundancy of the first data that is performed by the hybrid automatic repeat request HARQ retransmission according to the scheduling policy a remaining version, or receiving new data sent by the base station according to a scheduling policy, where the base station is a first base station providing a secondary serving cell or a second base station providing a primary serving cell, and the first base station and the second base station perform inter-base station carrier polymerization.

With reference to the fourth aspect, in a first possible implementation, the user equipment further includes: a third receiving unit, configured to receive a retransmission indication sent by the base station.

With reference to the fourth aspect or the first possible implementation manner, in a second possible implementation manner, the user equipment further includes: a sending unit, configured to send a channel quality indicator CQI to the base station.

With reference to the fourth aspect, in a third possible implementation, the user equipment further includes: a control unit, configured to determine whether the first data is successfully received, and a sending unit, configured to send the first HARQ feedback information to the base station, The first HARQ feedback information corresponds to the first data.

With reference to the third possible implementation manner, in a fourth possible implementation manner, the user equipment further includes: a fourth receiving unit, configured to receive cell configuration information sent by the base station.

With the fourth possible implementation, in a fifth possible implementation, in a case that the base station is the first base station, the sending unit is specifically configured to receive, at the first receiving unit, the base station In the case of the first data sent by the PDSCH, the first HARQ feedback information is sent by using the PUCCH of the base station; the first receiving unit is further configured to receive data sent by the second base station; and the sending unit is further configured to If the first receiving unit receives the data sent by the second base station, the first receiving unit switches to send the second HARQ feedback information by using the PUCCH of the second base station, where the second HARQ feedback information corresponds to the data sent by the second base station. The sending unit is further configured to: after the second HARQ feedback information is sent by the PUCCH of the second base station, switch back to use the PUCCH of the base station to send HARQ feedback information corresponding to the data sent by the base station.

With reference to the fourth aspect, in a sixth possible implementation, in a case that the base station is the first base station, the user equipment further includes: a control unit, configured to determine, for the first downlink HARQ process At least two buffers, the first buffer in the at least two buffers stores the first data, where the first downlink HARQ process corresponds to the first data; the control unit is further configured to determine whether the first data is successful Receiving the first data; the sending unit, configured to send the first HARQ feedback information to the second base station, where the first HARQ feedback information corresponds to the first data; the control unit is further configured to be in the first buffer Processing a redundancy version of the first data received by the second receiving unit; the control unit is further configured to process the first buffer in the first buffer or in a second buffer in the at least two buffers The new data received by the receiving unit.

With reference to the fourth aspect, in a seventh possible implementation, the user equipment further includes: a fifth receiving unit, configured to receive a handover indication sent by the base station, and a sending unit, configured to use the first according to the handover indication The uplink resource of the base station sends the HARQ feedback information corresponding to the data sent by the first base station or the HARQ feedback information corresponding to the data sent by the second base station by using the uplink resource of the second base station.

In a fifth aspect, the present invention provides a base station, where the base station is a first base station that provides a secondary serving cell, or the base station is a second base station that provides a primary serving cell, and includes:

a transmitter, configured to send first data to the user equipment on the physical downlink shared channel PDSCH, and configured to: determine, according to the scheduling policy, whether to perform a hybrid automatic repeat request for the first data

HARQ retransmission.

With reference to the fifth aspect, in a first possible implementation, the base station further includes: a receiver, configured to receive a channel quality indicator CQI, an error rate of a radio link control RLC protocol data unit PDU, or a number sent by the user equipment a HARQ feedback information, where the first HARQ feedback information corresponds to the first data; the processor is specifically configured to determine whether to perform hybrid automatic weight according to the CQI, the error rate of the RLC PDU, or the first HARQ feedback information. Request a HARQ retransmission.

With reference to the fifth aspect, in a second possible implementation manner, the processor is specifically configured to perform HARQ retransmission always; or the processor is specifically configured to perform HARQ retransmission.

With reference to the first possible implementation manner, in a third possible implementation manner, where the base station is the first base station that provides the secondary serving cell, the processor is further configured to determine, for the first downlink HARQ process. At least two buffers, where the first downlink HARQ process corresponds to the first data; the transmitter is specifically configured to send, by using the first buffer in the at least two buffers, the user equipment on the PDSCH The first data; the receiver is specifically configured to receive first HARQ feedback information sent by the user equipment by using the second base station; the processor is further configured to use, according to the first HARQ Feedback information, determining to use the first buffer for HARQ retransmission or sending new data; the processor is further configured to expire at the one or more loopback times RTT after the transmitter sends the first data, and the receiving If the first HARQ feedback information sent by the second base station is not received, determining to use the second buffer in the at least two buffers to send new data; the transmitter is further configured to use the first buffer The zone transmits a redundant version of the first data, or sends the new data using the first buffer or the second buffer.

In conjunction with the first possible implementation, in a fourth possible implementation, the transmitter is further configured to send a handover indication to the user equipment.

In conjunction with the fifth aspect, the first possible implementation, or the second possible implementation, in a fifth possible implementation, the transmitter is further configured to send a retransmission indication to the user equipment.

In conjunction with the first possible implementation, in a sixth possible implementation, the transmitter is further configured to send cell configuration information to the user equipment.

With reference to the fifth aspect, or any one of the foregoing possible implementation manners, in a seventh possible implementation manner, in a case that the processor determines to perform the HARQ retransmission, the transmitter is specifically configured to send to the user equipment. The new data is subjected to the HARQ retransmission in the next subframe in which the new data is transmitted.

With reference to the seventh possible implementation manner, in an eighth possible implementation manner, the transmitter is specifically configured to perform the HARQ retransmission using the same resource and modulation and coding manner as sending the new data.

In a sixth aspect, the present invention provides a user equipment, including:

a receiver, configured to receive first data that is sent by the base station on the physical downlink shared channel (PDSCH), and a processor that is configured to process the first data. The receiver is further configured to receive, by the base station, a hybrid automatic repeat request (HARQ) according to the scheduling policy. Redistributing a redundant version of the first data, or receiving new data sent by the base station according to a scheduling policy; the processor is further configured to process a redundant version of the first data or process the new data, where the base station is Providing a first base station of the secondary serving cell or a second base station providing the primary serving cell, where the first base station and the second base station perform carrier aggregation between the base stations.

In conjunction with the sixth aspect, in a first possible implementation, the receiver is further configured to receive a retransmission indication sent by the base station.

With reference to the sixth aspect or the first possible implementation manner, in a second possible implementation manner, the user equipment further includes: a transmitter, configured to send a channel quality indicator CQI to the base station.

With reference to the sixth aspect, in a third possible implementation, the processor is further configured to determine whether the first data is successfully received. The user equipment further includes: a transmitter, configured to send the first A HARQ feedback information, wherein the first HARQ feedback information corresponds to the first data.

In conjunction with the third possible implementation, in a fourth possible implementation, the receiver is further configured to receive cell configuration information sent by the base station.

With the fourth possible implementation, in a fifth possible implementation, in a case that the base station is the first base station, the transmitter is specifically configured to receive, at the receiver, the base station sends the PDSCH In the case of the first data, the first HARQ feedback information is sent by using the PUCCH of the base station; the receiver is further configured to receive data sent by the second base station; the transmitter is further configured to receive at the receiver. In the case of the data sent by the second base station, switching to use the PUCCH of the second base station to send the second HARQ feedback information, where the second HARQ feedback information corresponds to the data sent by the second base station; And after the PUCCH of the second base station sends the second HARQ feedback information, switch back to use the PUCCH of the base station to send HARQ feedback information corresponding to the data sent by the base station.

With reference to the sixth aspect, in a sixth possible implementation, in a case that the base station is the first base station, the processor is further configured to determine, by the first downlink HARQ process, at least two buffers, where The first buffer of the at least two buffers stores the first data, where the first downlink HARQ process corresponds to the first data; the processor is further configured to determine whether the first data is successfully received; the user The device further includes: a transmitter, configured to send first HARQ feedback information to the second base station, where the first HARQ feedback information corresponds to the first data; the processor is further configured to process in the first buffer a redundancy version of the first data received by the second receiver; the processor, further configured to process the second receive in the first buffer or in a second buffer of the at least two buffers The new data received by the device.

With reference to the sixth aspect, in a seventh possible implementation, the receiver is further configured to receive a handover indication sent by the base station, where the user equipment further includes: a transmitter, configured to use the first according to the handover indication The uplink resource of the base station sends the HARQ feedback information corresponding to the data sent by the first base station or the HARQ feedback information corresponding to the data sent by the second base station by using the uplink resource of the second base station.

According to the present invention, the base station can determine whether to perform HARQ retransmission according to the scheduling policy. This solves the problem that the user equipment cannot simultaneously transmit HARQ feedback information on the PUCCH of the first base station and the PUCCH of the second base station, so that the base station can perform HARQ operations effectively when performing inter-base station carrier aggregation.

According to a seventh aspect, the present invention provides a method for transmitting data, which provides an inter-base station carrier The first base station of the aggregated secondary serving cell or the second base station of the primary serving cell that provides carrier aggregation between the base stations includes:

Transmitting the first data to the user equipment on the physical downlink shared channel PDSCH, where the first data is data including a downlink medium access control MAC layer control element CE; receiving the hybrid automatic repeat request HARQ feedback sent by the user equipment In the case of the information, the new data is sent to the user equipment, where the HARQ feedback information is carried by the uplink MAC CE sent by the user equipment on the physical uplink shared channel PUSCH; if the HARQ feedback information sent by the user equipment is not received, And performing HARQ retransmission on the first data.

With reference to the seventh aspect, in a first possible implementation, where the method is performed by the second base station that provides the primary serving cell, the method further includes:

Receiving the first data sent by the first base station before transmitting the first data to the user equipment on the physical downlink shared channel PDSCH; and receiving the HARQ feedback information sent by the user equipment, to the first The base station transmits the HARQ feedback information.

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

After the first data is sent to the user equipment, the timing is started. If the timing reaches the preset threshold and the HARQ feedback information sent by the user equipment is not received, the HARQ retransmission is performed on the first data. .

With reference to the seventh aspect, or any one of the foregoing possible implementation manners, in a third possible implementation manner, performing the HARQ retransmission includes:

Sending a redundancy version of the first data to the user equipment; or determining second data including the downlink MAC CE, and sending the second data to the user equipment.

In an eighth aspect, the present invention provides a method for transmitting data, including:

Receiving, by the base station, first data that is sent by the physical downlink shared channel PDSCH, where the first data is data that includes a downlink medium access control MAC layer control element CE; in a case where it is determined that the first data is successfully received and decoded, The base station sends an uplink MAC CE that carries the HARQ feedback information of the hybrid automatic repeat request, and receives data for performing HARQ retransmission sent by the base station, where the data for performing the HARQ retransmission is a redundancy version of the first data or includes the downlink MAC address. The second data of the CE, or receiving the new data sent by the base station, where the base station is a first base station providing a secondary serving cell or a second base station providing a primary serving cell, where the first base station and the second base station perform inter-base station carrier polymerization. With reference to the eighth aspect, in a first possible implementation manner, in the case that it is determined that the first data is successfully received and decoded, the hybrid automatic repeat request HARQ feedback information is sent to the base station, including: determining to successfully receive and decode In the case of the first data, the uplink MAC CE is determined, and the uplink MAC CE carries the HARQ positive acknowledgment information; and the uplink MAC CE is sent to the base station.

A ninth aspect, the present invention provides a base station, where the base station is a first base station that provides a secondary serving cell, or the base station is a second base station that provides a primary serving cell, and includes:

a sending unit, configured to send the first data to the user equipment on the physical downlink shared channel PDSCH, where the first data is data that includes a downlink medium access control MAC layer control element CE, and the receiving unit is configured to receive, send, by the user equipment The hybrid automatic repeat request HARQ feedback information, where the HARQ feedback information is carried by the uplink MAC CE sent by the user equipment on the physical uplink shared channel PUSCH; and the control unit is configured to: when the receiving unit does not receive the HARQ feedback information Determining, performing a HARQ retransmission on the first data; the control unit is further configured to: when the receiving unit receives the HARQ feedback information, determine to send new data to the user equipment; the sending unit is further used to Send the new data to the user equipment or send data for HARQ retransmission.

With reference to the ninth aspect, in a first possible implementation, in a case that the base station is the second base station, the receiving unit is further configured to receive the first data sent by the first base station; And is further configured to send the HARQ feedback information to the first base station.

With reference to the ninth aspect or the first possible implementation manner, in a second possible implementation manner, the control unit is further configured to start timing when the sending unit completes sending the first data to the user equipment The control unit is specifically configured to perform HARQ retransmission on the first data if the timing reaches a preset threshold and the HARQ feedback information sent by the user equipment is not received.

With the ninth aspect or any of the foregoing possible implementation manners, in a third possible implementation, the sending unit is specifically configured to send a redundancy version of the first data to the user equipment; or the control unit, It is further configured to determine second data that includes the downlink MAC CE. The sending unit is specifically configured to send the second data to the user equipment.

In a tenth aspect, the present invention provides a user equipment, including:

a receiving unit, configured to receive first data that is sent by the base station on the physical downlink shared channel PDSCH, where the first data is data that includes a downlink medium access control MAC layer control element CE, and a control unit is configured to determine whether the data is successfully received and decoded. The first data; a sending unit, configured to the base The station sends an uplink MAC CE carrying the hybrid automatic repeat request HARQ feedback information; the receiving unit is further configured to receive data for performing HARQ retransmission sent by the base station, where the data for performing HARQ retransmission is redundancy of the first data The version includes the second data of the downlink MAC CE, or receives the new data sent by the base station, where the base station is a first base station providing a secondary serving cell or a second base station providing a primary serving cell, the first base station and the first base station The two base stations perform carrier aggregation between the base stations.

With reference to the tenth aspect, in a first possible implementation manner, the control unit is specifically configured to determine, in the case of determining that the first data is successfully received and decoded, the uplink MAC CE, where the uplink MAC CE carries a HARQ positive acknowledgement information.

In an eleventh aspect, the present invention provides a base station, where the base station is a first base station that provides a secondary serving cell, or the base station is a second base station that provides a primary serving cell, and includes:

a transmitter, configured to send the first data to the user equipment on the physical downlink shared channel PDSCH, where the first data is data that includes a downlink medium access control MAC layer control element CE, and the receiver is configured to receive the user equipment to send The hybrid automatic repeat request HARQ feedback information, where the HARQ feedback information is carried by the uplink MAC CE sent by the user equipment on the physical uplink shared channel PUSCH; and the processor is configured to: when the receiver does not receive the HARQ feedback information Determining, performing HARQ retransmission on the first data; the processor is further configured to: when the receiver receives the HARQ feedback information, determine to send new data to the user equipment; the transmitter is further used to Send the new data to the user equipment or send data for HARQ retransmission.

With reference to the eleventh aspect, in a first possible implementation, in a case that the base station is the second base station, the receiver is further configured to receive the first data sent by the first base station; And sending the HARQ feedback information to the first base station.

With reference to the eleventh aspect or the first possible implementation manner, in a second possible implementation manner, the processor is further configured to start, when the transmitter completes sending the first data to the user equipment The processor is configured to perform HARQ retransmission on the first data if the timing reaches a preset threshold and the HARQ feedback information sent by the user equipment is not received.

In conjunction with the eleventh aspect or any of the possible implementations described above, in a third possible implementation,

The transmitter is specifically configured to send a redundant version of the first data to the user equipment; or The processor is further configured to determine second data that includes the downlink MAC CE, where the transmitter is specifically configured to send the second data to the user equipment.

According to a twelfth aspect, the present invention provides a user equipment, including:

a receiver, configured to receive first data that is sent by the base station on the physical downlink shared channel PDSCH, where the first data is data that includes a downlink medium access control MAC layer control element CE, and a processor is configured to determine whether to successfully receive and decode The first data; the transmitter is configured to send, to the base station, an uplink MAC CE that carries the hybrid automatic repeat request HARQ feedback information; the receiver is further configured to receive data for performing HARQ retransmission sent by the base station, where the HARQ is performed. The retransmitted data is a redundancy version of the first data or second data including the downlink MAC CE, or receives new data sent by the base station, where the base station is a first base station providing a secondary serving cell or providing a primary serving cell The second base station, the first base station and the second base station perform carrier aggregation between the base stations.

With reference to the twelfth aspect, in a first possible implementation, the processor is specifically configured to determine, in the case of determining that the first data is successfully received and decoded, the uplink MAC CE, where the uplink MAC CE carries a HARQ affirmative Confirmation information; the transmitter is further configured to send the uplink MAC CE to the base station.

The base station can rely on the RLC ARQ mechanism to ensure the reliability of data transmission without performing HARQ retransmission or the number of HARQ retransmissions is small and the data transmission fails. However, the ARQ mechanism of the RLC layer is only applicable to downlink data from the RLC layer or the upper protocol layer, and is not applicable to the MAC CE generated only at the MAC layer. The present invention introduces a MAC layer feedback mechanism, and controls the retransmission of the downlink MAC CE by the uplink MAC CE carrying the HARQ feedback information, thereby improving the reliability of the MAC CE transmission. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in view of the drawings.

FIG. 1 is a schematic flowchart of a method of transmitting data according to an embodiment of the present invention.

2 is a schematic flow chart of a method of transmitting data according to an embodiment of the present invention.

FIG. 3 is a schematic flowchart of a method of transmitting data according to an embodiment of the present invention.

4 is a schematic flow chart of a method of transmitting data according to an embodiment of the present invention. FIG. 5 is a schematic flowchart of a method of transmitting data according to an embodiment of the present invention.

FIG. 6 is a schematic flowchart of a method of transmitting data according to an embodiment of the present invention.

FIG. 7 is a schematic flowchart of a method of transmitting data according to an embodiment of the present invention.

FIG. 8 is a schematic flowchart of a method of transmitting data according to an embodiment of the present invention.

FIG. 9a is a schematic flowchart of a method of transmitting data according to an embodiment of the present invention.

Figure 9b is a schematic diagram of the static load format of the uplink MAC CE.

FIG. 10 is a schematic structural diagram of a base station according to an embodiment of the present invention.

FIG. 11 is a schematic structural diagram of a base station according to an embodiment of the present invention.

FIG. 12 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.

FIG. 13 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.

FIG. 14 is a schematic structural diagram of a base station according to an embodiment of the present invention.

FIG. 15 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the scope of the present invention.

It should be understood that the technical solutions of the embodiments of the present invention can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, code division multiple access (Code Division Multiple Access) "CDMA") system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service ("GPRS"), Long Term Evolution (Long Term Evolution, "LTE" system, LTE frequency division duplex (Frequency Division "FDD") system, LTE time division duplex (Time Division Duplex, "TDD"), Universal Mobile Telecommunication system System, the barrel is called "UMTS" and so on.

The UE may also be referred to as a mobile terminal (MT), a mobile user equipment, etc., and may communicate with one or more core networks via a radio access network (eg, Radio Access Network, RAN), and the user equipment may be mobile. A terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal, for example, can be portable, pocket, handheld, computer Built-in or in-vehicle mobile device.

The base station may be a Base Transceiver Station (BTS) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an eNB or an e-NodeB in LTE, and the present invention is not limited thereto.

FIG. 1 is a schematic flowchart of a method of transmitting data according to an embodiment of the present invention. The method of Figure 1 is performed by a base station, which may be a first base station providing a secondary serving cell, and the base station may also be a second base station providing a primary serving cell. The first base station and the second base station perform carrier aggregation between the base stations, and the first base station and the second base station may simultaneously provide a Physical Uplink Control Channel (PUCCH), or the first base station and the second base station may not provide the PUCCH at the same time.

101. Send the first data to the user equipment on a Physical Downlink Shared Channel (PDSCH).

102. Determine, according to the scheduling policy, whether to perform a Hybrid Automatic Repeat Request (HARQ) retransmission on the first data.

According to the method shown in Figure 1, the base station can determine whether to perform HARQ retransmission according to the scheduling policy. This solves the problem that the user equipment cannot simultaneously transmit HARQ feedback information on the PUCCH of the first base station and the PUCCH of the second base station, so that the base station can perform HARQ operations effectively when performing inter-base station carrier aggregation.

2 is a schematic flow chart of a method of transmitting data according to an embodiment of the present invention. The method of Figure 2 is performed by a base station, which may be a first base station providing a secondary serving cell, and the base station may also be a second base station providing a primary serving cell. The first base station and the second base station perform carrier aggregation between the base stations, and the first base station and the second base station may simultaneously provide the PUCCH, or the first base station and the second base station may not provide the PUCCH at the same time.

The retransmission indication is sent to the user equipment, where the retransmission indication is used to indicate that the user equipment does not need to send the HARQ feedback information corresponding to the first data, where the first data is sent by the base station to the user equipment on the PDSCH, The HARQ feedback information includes a positive acknowledgment (Acknowledgment, ACK) and a negative acknowledgment (NACK). .

Optionally, the retransmission indication may be indicated to the user equipment by means of radio resource control (RRC) signaling, and the retransmission indication may also be through medium access control (MAC) The way the Control Element (CE) indicates the user device.

202. Send cell configuration information to the user equipment, or send a handover indication to the user equipment. The cell configuration information is used to indicate that the user equipment sends the first HARQ feedback information by using the PUCCH of the secondary serving cell, where the handover indication is used to indicate that the user equipment sends the HARQ corresponding to the data sent by the first base station by using the PUCCH of the first base station. The feedback information or the HARQ feedback information corresponding to the data transmitted by the second base station is transmitted using the PUCCH of the second base station.

Optionally, the handover indication may be indicated by the MAC CE to the user equipment, or may be indicated to the user equipment by means of RRC signaling.

It should be noted that step 201 and step 202 are optional steps. Step 201 or step 202 can be performed.

203. The physical downlink control channel (PDCCH) is configured to allocate a downlink resource and a specified HARQ process ID (HARQ process id) to the user equipment.

204. The first data that is sent to the user equipment on the PDSCH according to the allocated downlink resource and the specified HARQ process ID.

205. Determine, according to the scheduling policy, whether to perform HARQ retransmission on the first data.

Optionally, as an embodiment, the scheduling policy may be that the base station specifies that the data is always HARQ retransmitted, and the number of times the HARQ retransmission is performed is specified. When the number of HARQ retransmissions reaches the preset number of times, new data is started to be transmitted. In this way, after transmitting the first data, the base station may perform HARQ retransmission on the first data without using the HARQ feedback information corresponding to the first data fed back by the user equipment.

Optionally, as an embodiment, the scheduling policy may be that the base station specifies that HARQ retransmission is never performed. In this case, the base station always sends new data. In this way, after transmitting the first data, the base station may not need to determine whether to send new data according to the first data HARQ feedback information fed back by the user equipment.

Optionally, as an embodiment, the scheduling policy may be: the base station may receive a channel quality indicator (CQI) sent by the user equipment, and determine, according to the CQI, whether to perform HARQ retransmission, for example, the CQI is high. The new data is transmitted at or equal to the preset value, and if the CQI is lower than the preset value, the HARQ retransmission is performed. In this way, after transmitting the first data, the base station may perform HARQ retransmission on the first data without the HARQ feedback information corresponding to the first data fed back by the user equipment.

Optionally, as an embodiment, the scheduling policy may be: the base station receives an error rate of a RLC protocol data unit (PDU), and determines whether to perform a HARQ retransmission according to an error rate of the RLC PDU, for example, When the error rate is higher than or equal to the preset value, Perform HARQ retransmission and send new data if the error rate is lower than the preset value. In this way, after transmitting the first data, the base station may perform HARQ retransmission on the first data without using the HARQ feedback information corresponding to the first data fed back by the user equipment.

Generally, in the case that the base station does not perform HARQ retransmission or the number of HARQ retransmissions is small, the data transmission fails, if the physical layer transmission fails, the radio link control (RLC) can be automatically relied on. The Automatic Retransmission Request (ARQ) mechanism guarantees the reliability of the data transmission.

Optionally, as an embodiment, the scheduling policy may be: the base station receives the first HARQ feedback information corresponding to the first data, performs HARQ retransmission on the first data according to the first HARQ feedback information, or sends new data. . Specifically, the base station can directly receive the first HARQ feedback information sent by the user equipment. Alternatively, if the base station is the first base station, the base station may further receive the first HARQ feedback information sent by the user equipment by using the second base station.

Optionally, in the case that the HARQ retransmission of the first data is determined, the base station sends new data to the user equipment, and performs HARQ retransmission in the next subframe after the new data is sent. The base station can perform HARQ retransmission using the same resource and coded modulation as transmitting the new data.

Optionally, as an embodiment, in a case where the base station is the first base station, the base station may determine at least two buffers for each downlink HARQ process before transmitting data to the user equipment. Specifically, when determining the at least two buffers, the base station determines that different buffers have corresponding numbers, and the base station may determine, according to the number, a buffer for sending data and a buffer for processing HARQ feedback information corresponding to the data; or The base station can also transmit data using different buffers in turn and use the buffer to process HARQ feedback information corresponding to the data. The base station can transmit data using one of the at least two buffers and another data using another buffer. The base station may receive the HARQ feedback information sent by the user equipment by using the second base station, and determine whether to perform HARQ retransmission according to the HARQ feedback information. Specifically, when receiving the HARQ feedback information, the base station may further receive one or more of a HARQ process ID, HARQ time information, and buffer index information corresponding to the HARQ feedback information, and according to the HARQ process ID, HARQ. One or more of time information and buffer index information, determining a buffer used, the base station may retransmit the data corresponding to the HARQ feedback information according to the HARQ feedback information in the buffer, or in the buffer Send new data to the user device. In addition, the base station expires one or more HARQ Round Trip Time (RTT) after transmitting data in one of the at least two buffers, and does not receive the user equipment through the second base. In the case where the station transmits HARQ feedback information corresponding to the data, new data is transmitted using another buffer of the at least two buffers.

For example, the base station may determine at least two buffers for the first downlink HARQ process where the first data is located before sending the first data to the user equipment. The base station can transmit the first data to the user equipment using the first one of the at least two buffers. The base station receives the first HARQ feedback information sent by the user equipment by using the second base station. The base station may further receive one or more of the following: the first HARQ process ID, the first HARQ time information, and the first buffer index information, where the first HARQ process ID, the first HARQ time information, and the first A buffer index information corresponds to the first HARQ feedback information. The base station performs HARQ retransmission or new data on the first data by using the first buffer in the at least two buffers according to the first HARQ feedback information. Specifically, the base station determines, according to the first HARQ feedback information, whether to perform HARQ retransmission on the first data. The base station determines, according to the first HARQ process ID, the first HARQ time information, or the first buffer index information, a first buffer for processing the first HARQ feedback in the at least two buffers. In addition, the base station uses the second buffer in the at least two buffers when one or more HARQ RTTs after the first data is transmitted expires and the base station does not receive the first HARQ feedback sent by the second base station. Zone, and send the new data on the same HARQ process. In general, the base station sends the first data in the first buffer of the at least two buffers, and the second buffer in the at least two buffers sends new data, where different buffers of the same HARQ process have Corresponding numbers or use different buffers in a certain order. After a HARQ RTT or a longer time, the base station receives the first HARQ feedback forwarded by the second base station, and the base station determines to perform HARQ retransmission on the first data or send new data according to the first HARQ feedback (for example, the second data). After receiving a HARQ RTT or a longer time, the base station receives the HARQ feedback corresponding to the second data forwarded by the second base station, determines, according to the HARQ feedback, performs HARQ retransmission on the second data, or sends new data. (eg third data).

According to the method shown in Figure 2, the base station can determine whether to perform HARQ retransmission according to the scheduling policy. This solves the problem that the user equipment cannot simultaneously transmit HARQ feedback information on the PUCCH of the first base station and the PUCCH of the second base station, so that the base station can perform HARQ operations effectively when performing inter-base station carrier aggregation.

FIG. 3 is a schematic flowchart of a method of transmitting data according to an embodiment of the present invention. The method of Figure 3 is performed by the user equipment.

301. Receive first data that is sent by the base station on the PDSCH. 302. Receive a redundancy version of the first data that the base station performs HARQ retransmission according to the scheduling policy, or receive new data that is sent by the base station according to the scheduling policy.

The scheduling policy described above is the same as the scheduling policy of the embodiment of FIG. 1, and need not be described here.

Optionally, the base station may be a first base station that provides a secondary serving cell, and the base station may also be a second base station that provides a primary serving cell. The first base station and the second base station perform carrier aggregation between the base stations, and the first base station and the second base station can simultaneously provide the PUCCH, or the first base station and the second base station do not simultaneously provide the PUCCH.

According to the method shown in FIG. 3, when receiving the data sent by the base station, the user equipment does not need to send the HARQ feedback to the base station, and can receive the redundancy version of the data that the base station performs HARQ retransmission, or the receiving base station. New data sent. In this way, the problem that the user equipment cannot simultaneously transmit the HARQ feedback information on the PUCCH of the first base station and the PUCCH of the second base station can be solved, so that the base station can perform the HARQ operation effectively when performing inter-base station carrier aggregation.

4 is a schematic flow chart of a method of transmitting data according to an embodiment of the present invention. The method of Figure 4 is performed by the user equipment.

It should be noted that, unless otherwise specified, the base station referred to in the method shown in FIG. 4 may be a first base station providing a secondary serving cell, or a second base station providing a primary serving cell, where the first base station Performing inter-base station carrier aggregation with the second base station, the first base station and the second base station may simultaneously provide the PUCCH, or the first base station and the second base station may not provide the PUCCH at the same time.

401. Receive a retransmission indication sent by the base station, where the retransmission indication is used to indicate that the user equipment does not need to send HARQ feedback information. The user equipment determines that the HARQ feedback information is not sent to the base station if the retransmission indication is received.

Optionally, the retransmission indication may be indicated to the user equipment by means of RRC signaling, and the retransmission indication may also be indicated by the MAC CE.

402. Receive cell configuration information that is sent by the base station, or a handover indication, where the cell configuration information is used to indicate that the user equipment sends the first HARQ feedback information by using the PUCCH of the secondary serving cell, where the handover indication is used to indicate that the user equipment is used. The uplink resource of a base station transmits HARQ feedback information corresponding to the data sent by the first base station or the HARQ feedback information corresponding to the data sent by the second base station by using the uplink resource of the second base station.

It should be noted that step 401 and step 402 are optional steps. Can perform step 401 or Step 402.

403. Obtain a downlink resource and a specified HARQ process ID allocated by the base station in the PDCCH.

404. Receive, by using the downlink resource and the specified HARQ process ID, the first data sent by the base station on the PDSCH.

Optionally, in a case where the base station is the first base station, the user equipment may further receive data sent by the second base station on the PDSCH.

Optionally, in the case that the base station is the first base station and receives the cell configuration information sent by the base station, step 405 and step 406 may be included.

405. If the data sent by the second base station on the PDSCH is received, switch to use the PUCCH of the second base station to send the second HARQ feedback information, where the second HARQ feedback information corresponds to the data sent by the second base station.

Optionally, before receiving the data sent by the second base station, the user equipment sends the first HARQ feedback information corresponding to the first data by using the PUCCH of the base station.

406. After the second HARQ feedback information is sent by the PUCCH of the second base station, switch back to the PUCCH that uses the base station to send HARQ feedback information corresponding to the data sent by the base station.

In the case that the downlink service data of the user equipment is mainly responsible by the base station, since the downlink data of the second base station is not frequently transmitted, the cell configuration information is received, and steps 405 and 406 are performed, and such operations affect the normal HARQ operation of the base station. Smaller. Further, step 409 is performed.

Optionally, in the case that the handover indication sent by the base station is received, after performing step 404, step 407 may be performed.

407. Send, according to the handover indication, the HARQ feedback information corresponding to the data sent by the first base station by using the uplink resource of the first base station, or send the HARQ feedback information corresponding to the data sent by the second base station by using the uplink resource of the second base station.

Optionally, if the base station is the first base station, if the handover indication is used to indicate that the user equipment sends the HARQ feedback information corresponding to the data sent by the first base station by using the uplink resource of the first base station, the user equipment The first HARQ feedback information corresponding to the first data may be transmitted using a PUCCH of the first base station or may be transmitted using a physical uplink shared channel (PUSCH) of the first base station. If the handover indication is used to indicate that the user equipment sends the HARQ feedback information corresponding to the data sent by the second base station by using the uplink resource of the second base station, the user equipment determines not to send the first HARQ feedback information. If the base station is the second base station, if the handover indication is used to indicate that the user equipment uses the uplink resource of the first base station Sending the HARQ feedback information corresponding to the data sent by the first base station, the user equipment determines not to use the PUCCH of the base station to transmit the HARQ feedback information corresponding to the data sent by the first base station, and does not use the PUSCH transmission of the base station to correspond to the first HARQ feedback information of data transmitted by a base station. If the handover indication is used to indicate that the user equipment uses the uplink resource of the second base station to send the HARQ feedback information corresponding to the data sent by the second base station, the user equipment may use the PUCCH of the base station or may use the base station. The PUSCH transmits the first HARQ feedback information.

Optionally, in a case that the user equipment does not send the first HARQ feedback information to the base station, step 408 may be performed, where the user equipment may not send the first HARQ to the base station if the base station does not have uplink resources. The feedback information may also be determined according to step 401 or step 407 that the first HARQ feedback information is not sent to the base station.

408. Send a CQI to the base station, so that the base station determines whether to perform HARQ retransmission according to the CQI.

409. Receive a redundancy version of the first data that the base station performs HARQ retransmission, or receive new data sent by the base station.

Optionally, in an embodiment, where the base station is the first base station that provides the secondary serving cell, the user equipment may determine at least two buffers, and the first buffer in the at least two buffers. Save the first data. Specifically, when determining the at least two buffers, the user equipment determines that different buffers have corresponding numbers, and the user equipment may determine, according to the number, a buffer for saving and processing data usage; or the user equipment may also take turns Save and process data using different buffers. The user equipment may also send first HARQ feedback information to the second base station that provides the primary serving cell, so that the second base station feeds back the first HARQ feedback information to the base station. The user equipment can receive a redundancy version of the first data sent by the base station for HARQ retransmission, and process the redundancy version of the first data in the first buffer. The user equipment can also receive new data sent by the base station, and process the new data in a first buffer or a second buffer in the at least two buffers. Specifically, the user equipment may save and process the new data in the first buffer if the first data is successfully received, and the user equipment may be in the second buffer if the first data is not successfully received. Save and process this new data.

According to the method shown in FIG. 4, when receiving the data sent by the base station, the user equipment does not need to send the HARQ feedback to the base station, and can receive the redundancy version of the data that the base station performs HARQ retransmission, or the receiving base station. New data sent. In this way, the user equipment can not be solved. At the same time, the problem of transmitting HARQ feedback information on the PUCCH of the first base station and the PUCCH of the second base station enables the base station to perform the HARQ operation effectively when performing inter-base station carrier aggregation.

FIG. 5 is a schematic flowchart of a method of transmitting data according to an embodiment of the present invention.

It should be noted that, unless otherwise specified, the base station referred to in the method shown in FIG. 5 may be a first base station providing a secondary serving cell, or a second base station providing a primary serving cell, where the first base station Inter-base station carrier aggregation is performed with the second base station.

501. The base station sends a retransmission indication to the user equipment, where the retransmission indication is used to indicate that the user equipment does not need to send the HARQ feedback information corresponding to the first data, where the first data is sent by the base station to the user equipment on the PDSCH. .

Optionally, the retransmission indication may be indicated to the user equipment by means of RRC signaling, and the retransmission indication may also be indicated to the user equipment by means of a MAC CE.

502. The base station sends a cell configuration information or a handover indication to the user equipment, where the cell configuration information is used to indicate that the user equipment sends the uplink information by using the PUCCH of the secondary serving cell, where the handover indication is used to indicate that the user equipment uses the uplink of the first base station. The resource transmits HARQ feedback information corresponding to data transmitted by the first base station or HARQ feedback information corresponding to data transmitted by the second base station by using uplink resources of the second base station.

It should be noted that step 501 and step 502 are optional steps, and step 501 or step 502 may be performed.

503. The base station allocates a downlink resource and a specified HARQ process ID to the user equipment on the physical downlink control channel PDCCH.

504. The user equipment receives the first data that the base station sends to the PDSCH.

Optionally, in the case that the base station is the first base station, the user equipment may further receive downlink information sent by the second base station on the PDSCH.

Optionally, in a case where the base station is the first base station and receives cell configuration information, the user equipment determines to use the PUCCH of the second base station to send uplink information. The user equipment determines whether the data sent by the second base station on the PDSCH is successfully received, and the second HARQ feedback information is sent in the PUCCH of the second base station, where the second HARQ feedback information corresponds to the data sent by the second base station. In the case of completing the second HARQ feedback information transmission, it is determined that the uplink information is transmitted using the PUCCH of the base station. 505. Determine whether the first data is successfully received.

Optionally, if the base station does not have an uplink resource, the user equipment does not send the first HARQ feedback information corresponding to the first data to the base station. When the base station has an uplink resource, the user equipment sends the first HARQ feedback information to the base station, where the first HARQ feedback information includes a positive acknowledgement (ACK) and a negative acknowledgement (nack). Optionally, the user equipment may send the first HARQ feedback information on the PUCCH, and may also send the first HARQ feedback information on the PUSCH.

Optionally, in the case that the handover indication is received, the user equipment may further determine, according to the handover indication, whether to send the first HARQ feedback information to the base station.

Optionally, in the case that the method of FIG. 5 is performed by the first base station that provides the secondary serving cell, if the handover indication is used to indicate that the user equipment uses the uplink resource of the first base station to send data corresponding to the data sent by the first base station. The HARQ feedback information may be that the user equipment may use the PUCCH of the first base station or may send the first HARQ feedback information corresponding to the first data by using the PUSCH of the first base station. If the handover indication is used to indicate that the user equipment uses the uplink resource of the second base station to send HARQ feedback information corresponding to the data sent by the second base station, the user equipment determines not to send the first HARQ feedback information.

Optionally, if the method of FIG. 5 is performed by the second base station that provides the primary serving cell, if the handover indication is used to indicate that the user equipment uses the uplink resource of the first base station to send data corresponding to the data sent by the first base station. The HARQ feedback information indicates that the user equipment determines that the HARQ feedback information corresponding to the data sent by the first base station is not used by using the PUCCH of the base station, and does not use the PUSCH of the base station to send the HARQ feedback information corresponding to the data sent by the first base station. If the handover indication is used to indicate that the user equipment uses the uplink resource of the second base station to send the HARQ feedback information corresponding to the data sent by the second base station, the user equipment may use the PUCCH of the base station or may use the base station. The PUSCH transmits the first HARQ feedback information.

506. The base station determines whether to perform HARQ retransmission on the first data.

Optionally, when receiving the first HARQ feedback information, the base station determines, according to the HARQ feedback information, whether to perform HARQ retransmission on the first data.

Optionally, the base station determines whether to perform HARQ retransmission on the first data according to the scheduling policy, if the first HARQ feedback information is not received.

Specifically, the scheduling policy may be that the base station specifies that the HARQ retransmission is always performed on the data, and the number of times the HARQ retransmission is performed is specified. The number of HARQ retransmissions reaches the preset number of times In the case, start sending new data. The scheduling policy may also be that the base station specifies never to perform

HARQ retransmission, in this case, the base station always sends new data. The scheduling policy may be that the base station may receive a channel quality indicator (CQI) sent by the user equipment, and determine, according to the CQI, whether to perform HARQ retransmission, for example, if the CQI is higher than or equal to a preset value. Send new data and perform HARQ retransmission if the CQI is lower than the preset value. The scheduling policy may be that the base station receives the error rate of the RLC protocol data unit (PDU), and determines whether to perform the HARQ retransmission according to the error rate of the RLC PDU, for example, the error rate is higher than or equal to a preset value. In the case of HARQ retransmission, new data is transmitted if the error rate is lower than the preset value. In the case that the base station does not perform HARQ retransmission or the number of HARQ retransmissions is small, resulting in data transmission failure, if the physical layer transmission fails, it may depend on the radio link control layer (RLC). The Automatic Retransmission Request (ARQ) mechanism ensures the reliability of the data transmission.

507. The user equipment receives a redundancy version of the first data that the base station performs HARQ retransmission, or receives new data sent by the base station.

Optionally, in the case that the base station retransmits the first data, the base station sends new data to the user equipment, and performs HARQ retransmission in the next subframe after the new data is sent. The base station can perform HARQ retransmission using the same resource and code modulation scheme as transmitting the new data.

According to the method shown in FIG. 5, the base station may determine whether to perform HARQ retransmission according to the scheduling policy without receiving the HARQ feedback information sent by the user equipment. This solves the problem that the user equipment cannot simultaneously transmit HARQ feedback information on the PUCCH of the first base station and the PUCCH of the second base station, so that the base station can perform HARQ operations effectively when performing inter-base station carrier aggregation.

FIG. 6 is a schematic flowchart of a method of transmitting data according to an embodiment of the present invention. The method of Figure 6 is performed by a base station, which may be a first base station providing a secondary serving cell, and the base station may also be a second base station providing a primary serving cell.

601. Send first data to the user equipment on the PDSCH, where the first data is data including a downlink MAC CE.

It should be understood that the downlink MAC CE is the encoded MAC CE, not the original MAC CE.

602. When receiving the HARQ feedback information sent by the user equipment, send new data to the user equipment. The HARQ feedback information is sent by the user equipment on the PUSCH. The line MAC CE carries.

It should be understood that the uplink MAC CE is the encoded MAC CE, not the original MAC CE.

603. Perform HARQ retransmission on the first data if the HARQ feedback information sent by the user equipment is not received.

According to the method of FIG. 1 to FIG. 5, the base station can rely on the RLC ARQ mechanism to ensure the reliability of data transmission without performing HARQ retransmission or the number of HARQ retransmissions is small and the data transmission fails. However, the ARQ mechanism of the RLC layer is only applicable to downlink data from the RLC layer or the upper layer protocol layer, and is not applicable to the MAC CE generated only at the MAC layer. In the method of FIG. 6, the MAC layer feedback mechanism is introduced, and the uplink MAC CE carrying the HARQ feedback information is used to control the retransmission of the downlink MAC CE, thereby improving the reliability of the MAC CE transmission.

FIG. 7 is a schematic flowchart of a method of transmitting data according to an embodiment of the present invention. The method of Figure 7 is performed by a base station, which may be a first base station providing a secondary serving cell, and the base station may also be a second base station providing a primary serving cell.

Optionally, in the case that the base station is the second base station, step 701 may be included.

701. Receive first data sent by the first base station.

702. Allocate a downlink resource to the user equipment on the PDCCH.

703. Send first data to the user equipment on the PDSCH, where the first data is data that includes a downlink MAC CE.

704. Set a timer, and start timing when the first data transmission is sent to the user equipment.

705. If the HARQ feedback information sent by the user equipment is received, send new data to the user equipment, where the HARQ feedback information is carried by the uplink MAC CE sent by the user equipment on the PUSCH.

706. If the timer is up to a preset time and the HARQ feedback information sent by the user equipment is not received, the first data information HARQ is retransmitted.

Specifically, the base station may send a redundancy version of the first data to the user equipment. The base station also The second data including the downlink MAC CE may be determined, and the second data is sent to the user equipment. For example, the downlink MAC CE may generate a separate MAC PDU or multiplex with other uplink data to generate a new MAC PDU as the second data and send the data to the user equipment.

Optionally, the base station may further set a maximum number of retransmissions for HARQ retransmission of the first data. When the number of HARQ retransmissions reaches the maximum number of retransmissions, and the uplink MAC CE including the HARQ feedback information is not received, the base station may send new data to the user equipment.

Optionally, the base station may further perform HARQ retransmission on the first data according to the scheduling policy. For example, the HARQ retransmission and the number of HARQ retransmissions may be determined according to the CQI received by the user equipment.

According to the method of FIG. 1 to FIG. 5, the base station can rely on the RLC ARQ mechanism to ensure the reliability of data transmission without performing HARQ retransmission or the number of HARQ retransmissions is small and the data transmission fails. However, the ARQ mechanism of the RLC layer is only applicable to downlink data from the RLC layer or the upper layer protocol layer, and is not applicable to the MAC CE generated only at the MAC layer. In the method of FIG. 7, the MAC layer feedback mechanism is introduced, and the uplink MAC CE carrying the HARQ feedback information is used to control the retransmission of the downlink MAC CE, thereby improving the reliability of the MAC CE transmission.

FIG. 8 is a schematic flowchart of a method of transmitting data according to an embodiment of the present invention. The method shown in Figure 8 is performed by the user equipment.

801. Receive first data that is sent by the base station on the PDSCH, where the first data is data that includes a downlink MAC CE.

802. Send, in the case of determining that the first data is successfully received and decoded, send an uplink MAC CE that carries the HARQ feedback information to the base station.

803. Receive data for performing HARQ retransmission sent by the base station or receive new data sent by the base station, where the data for performing HARQ retransmission is a redundancy version of the first data or second data including the downlink MAC CE.

Optionally, the base station may be a first base station that provides a secondary serving cell, and the base station may also be a second base station that provides a primary serving cell. According to the method of FIG. 1 to FIG. 5, the base station can rely on the ARQ mechanism of the RLC to ensure the reliability of data transmission without performing HARQ retransmission or the number of HARQ retransmissions is small and the data transmission fails. However, the ARQ mechanism of the RLC layer is only applicable to downlink data from the RLC layer or the upper protocol layer, and is not applicable to the MAC CE generated only at the MAC layer. Taking the method of Figure 8, the MAC layer feedback mechanism is introduced to improve the reliability of MAC CE transmission.

FIG. 9a is a schematic flowchart of a method of transmitting data according to an embodiment of the present invention. The method shown in Figure 9a is performed by the user equipment.

901. Receive first data that is sent by a base station on a PDSCH, where the first data is data that includes a downlink MAC CE.

902. Determine whether the first data is successfully received and decoded.

903. Determine the uplink MAC CE, and send the uplink MAC CE to the base station, where the uplink MAC CE carries the HARQ Acknowledgment (ACK) information.

Optionally, if the user equipment does not successfully receive or decode the first data, the uplink MAC CE is not sent to the base station.

Specifically, the static payload format of the uplink MAC CE is as shown in FIG. 9b. The value of any bit of b0-b4 is successful and the downlink MAC CE is successfully decoded. A value of 0 indicates that the corresponding downlink MAC CE does not exist.

HARQ ACK information. R denotes a reserved field. After a new downlink MAC CE is introduced, R may be used to indicate HARQ ACK feedback corresponding to the new downlink MAC CE.

904. If the uplink MAC CE is sent to the base station, receive new data sent by the base station, where the data for performing HARQ retransmission is a redundancy version of the first data or second data including the downlink MAC CE.

Optionally, the user equipment sends the uplink MAC CE to the base station, but the base station does not receive the uplink MAC CE because the transmission fails. In this case, the user equipment can also receive data from the base station for HARQ retransmission.

905. If the uplink MAC CE is not sent to the base station, the receiving base station performs HARQ retransmitted data.

Optionally, the base station may be a first base station that provides a secondary serving cell, and the base station may also be a second base station that provides a primary serving cell.

According to the method of FIG. 1 to FIG. 5, the base station can rely on the RLC ARQ mechanism to ensure the reliability of data transmission without performing HARQ retransmission or the number of HARQ retransmissions is small and the data transmission fails. However, the ARQ mechanism of the RLC layer is only applicable to downlink data from the RLC layer or the upper layer protocol layer, and is not applicable to the MAC CE generated only at the MAC layer. Taking the method of Figure 9a, the MAC layer feedback mechanism is introduced to improve the reliability of MAC CE transmission.

FIG. 10 is a schematic structural diagram of a base station according to an embodiment of the present invention. The base station 1000 shown in Fig. 10 can perform the various steps of Fig. 1. The base station 1000 includes a transmitting unit 1001 and a control unit 1002.

The sending unit 1001 is configured to send the first data to the user equipment on the PDSCH.

The control unit 1002 is configured to determine, according to the scheduling policy, whether to perform HARQ retransmission on the first data.

Optionally, the base station 1000 may be a first base station that provides a secondary serving cell, and the base station 1000 may also be a second base station that provides a primary serving cell.

According to the base station shown in FIG. 10, the base station 1000 can determine whether to perform HARQ retransmission according to the scheduling policy. This solves the problem that the user equipment cannot simultaneously transmit HARQ feedback on the PUCCH of the first base station and the PUCCH of the second base station, so that the base station 1000 can perform HARQ operations effectively when performing inter-base station carrier aggregation.

FIG. 11 is a schematic structural diagram of a base station according to an embodiment of the present invention. The base station 1100 shown in Fig. 11 can perform the various steps performed by the base station in Fig. 1 or Fig. 2. The base station 1100 includes a transmitting unit 1101, a control unit 1102, and a receiving unit 1103. The base station 1100 may be a first base station providing a secondary serving cell, and the base station 1000 may also be a second base station providing a primary serving cell.

The control unit 1102 is configured to allocate a downlink resource and a specified HARQ process ID to the user equipment in the PDCCH.

The sending unit 1101 is configured to send the first data to the user equipment on the PDSCH.

The control unit 1102 is further configured to determine, according to the scheduling policy, whether to perform HARQ retransmission on the first data.

Optionally, the receiving unit 1102 is configured to determine whether to perform the HARQ retransmission according to the scheduling policy, and the method includes: the control unit 1102 is configured to specify that the scheduling policy is always performing HARQ retransmission. The control unit 1102 is specifically configured to specify that the scheduling policy is that no HARQ retransmission is performed. Or The control unit 1102 is specifically configured to specify that the scheduling policy is to determine whether to perform HARQ retransmission according to an error rate of the CQI or the RLC PDU received by the receiving unit 1103.

Optionally, the receiving unit 1103 is configured to receive first HARQ feedback information sent by the user equipment, where the first HARQ feedback information corresponds to the first data. The control unit 1102 is further configured to specify the scheduling policy to determine whether to perform HARQ retransmission according to the first HARQ feedback information.

Optionally, the sending unit 1101 is further configured to: before sending the first data to the user equipment, send, to the user equipment, a handover indication, where the handover indication is used to indicate that the user equipment uses the PUCCH transmission of the first base station to correspond to the first The HARQ feedback information of the data transmitted by the base station or the HARQ feedback information corresponding to the data transmitted by the second base station is transmitted using the PUCCH of the second base station.

Optionally, in the case that the control unit 1102 determines to perform the HARQ retransmission, the sending unit 1101 is specifically configured to send new data to the user equipment, and perform HARQ retransmission in the next subframe in which the new data is sent. The sending unit 1101 is further configured to perform the HARQ retransmission using the same resource and modulation and coding manner as the new data is sent.

Optionally, the sending unit 1101 is further configured to: before sending the first data to the user equipment, send a retransmission indication to the user equipment, where the retransmission indication is used to indicate that the user equipment does not need to send the first HARQ feedback information. .

Optionally, the sending unit 1101 is further configured to: before sending the first data to the user equipment, send, to the user equipment, cell configuration information, where the cell configuration information is used to indicate that the user equipment sends the uplink by using a PUCCH of the secondary serving cell. information.

Optionally, as an embodiment, in a case where the base station 1100 is the first base station, before the sending unit 1101 sends data to the user equipment, the control unit 1102 may be configured to determine at least two buffers for each downlink HARQ process. Specifically, the control unit 1102 is configured to determine, when determining the at least two buffers, that different buffers have corresponding numbers, and the control unit 1102 can be configured to determine, according to the number, a buffer for sending data and processing HARQ corresponding to the data. A buffer of feedback information; or the control unit 1102 may be further configured to determine to transmit data using different buffers in turn and use the buffer to process HARQ feedback information corresponding to the data. The sending unit 1101 can be configured to transmit data using one of the at least two buffers and another data using another buffer. The receiving unit 1103 is configured to receive the HARQ feedback information sent by the user equipment by using the second base station, and the control unit 1102 is configured to determine, according to the HARQ feedback information, whether to perform the HARQ retransmission. Specifically, when receiving the HARQ feedback information, the receiving unit 1103 may also And a method for receiving one or more of a HARQ process ID, HARQ time information, and buffer index information corresponding to the HARQ feedback information. The control unit 1102 is configured to determine, according to one or more of the HARQ process ID, the HARQ time information, and the buffer index information, a used buffer, where the control unit 1102 can be configured to determine, according to the HARQ feedback in the buffer. The data corresponding to the HARQ feedback is retransmitted, or it is determined that new data is sent to the user equipment in the buffer. In addition, the control unit 1102 is further configured to expire one or more HARQ Round Trip Time (RTT) after transmitting data in one of the at least two buffers, and the user equipment is not received. In the case of HARQ feedback information corresponding to the data transmitted by the second base station, it is determined to transmit new data using another buffer of the at least two buffers. The sending unit 1101 is further configured to send a redundant version of the first data by using the first buffer, or send the new data by using the first buffer or the second buffer.

For example, before the sending unit 1101 sends the first data to the user equipment, the control unit 1102 may be configured to determine at least two buffers for the first downlink HARQ process where the first data is located. The sending unit 1101 is configured to send the first data to the user equipment by using the first buffer in the at least two buffers. The receiving unit 1103 can be configured to receive first HARQ feedback information that is sent by the user equipment by using the second base station. The receiving unit 1103 is further configured to receive one or more of the following: the first HARQ process ID, the first HARQ time information, and the first buffer index information, where the first HARQ process ID, the first HARQ time The information and the first buffer index information correspond to the first HARQ feedback information. The control unit 1102 is configured to determine, according to the first HARQ feedback information, performing HARQ retransmission or sending new data on the first data by using the first buffer in the at least two buffers. Specifically, the control unit 1102 determines whether to perform HARQ retransmission on the first data according to the first HARQ feedback information. The control unit 1102 determines, according to the first HARQ process ID, the first HARQ time information, or the first buffer index information, a first buffer for processing the first HARQ feedback in the at least two buffers. In addition, if the one or more HARQ RTTs after the first data is transmitted expires and the base station does not receive the first HARQ feedback sent by the second base station, the control unit 1102 determines to use the first of the at least two buffers. Two buffers, and the new data is sent on the same HARQ process. The sending unit 1101 is further configured to send a redundant version of the first data by using the first buffer, or send the new data by using the first buffer or the second buffer.

According to the base station shown in FIG. 11, the base station 1100 can determine whether to perform according to the scheduling policy.

HARQ retransmission. This solves the problem that the user equipment cannot simultaneously be at the PUCCH and the second base of the first base station. The problem of transmitting HARQ feedback on the PUCCH of the station enables the base station 1100 to perform HARQ operations efficiently when performing inter-base station carrier aggregation.

FIG. 12 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. The user equipment 1200 shown in FIG. 12 can perform the various steps performed by the user equipment in FIG. User equipment 1200 includes: a first receiving unit 1201 and a second receiving unit 1202.

The first receiving unit 1201 is configured to receive first data that is sent by the base station on the PDSCH.

The second receiving unit 1202 is configured to receive a redundancy version of the first data that the base station performs HARQ retransmission according to the scheduling policy, or receive new data that is sent by the base station according to the scheduling policy.

Optionally, the base station is a first base station that provides a secondary serving cell or a second base station that provides a primary serving cell, and the first base station and the second base station perform carrier aggregation between the base stations.

According to the user equipment 1200 shown in FIG. 12, when receiving the data sent by the base station, the user equipment 1200 does not need to send the HARQ feedback to the base station, and can receive the redundancy version of the data that the base station performs HARQ retransmission. Or receive new data sent by the base station. In this way, the problem that the user equipment cannot simultaneously transmit the HARQ feedback on the PUCCH of the first base station and the PUCCH of the second base station can be solved, so that the base station can perform the HARQ operation effectively when performing inter-base station carrier aggregation.

FIG. 13 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. The user equipment 1300 shown in FIG. 13 can perform the various steps performed by the user equipment in FIG. 3 or FIG. The user equipment 1300 includes: a first receiving unit 1301, a second receiving unit 1302, a control unit 1303, a transmitting unit 1304, a third receiving unit 1305, a fourth receiving unit 1306, and a fifth receiving unit 1307.

The first receiving unit 1301 is configured to receive first data that is sent by the base station on the PDSCH.

The second receiving unit 1302 is configured to receive a redundancy version of the first data that the base station performs HARQ retransmission according to the scheduling policy, or receive new data that is sent by the base station according to the scheduling policy.

Optionally, the control unit 1303 is further configured to determine whether the first data is successfully received. The sending unit 1304 is configured to send first HARQ feedback information to the base station, where the first HARQ feedback information corresponds to the first data.

Optionally, before the first receiving unit 1301 receives the first data sent by the base station, the third receiving unit 1305 is configured to receive a retransmission indication sent by the base station, where the retransmission indication is used to indicate that the user equipment 1300 does not need to send HARQ feedback information corresponding to data transmitted by the base station. Optionally, before the first receiving unit 1301 receives the first data sent by the base station, the fourth receiving unit 1306 is configured to receive cell configuration information sent by the base station, where the cell configuration information is used to indicate that the user equipment 1300 uses the secondary serving cell. The PUCCH sends uplink information.

Optionally, when the base station is the first base station, and the fourth receiving unit 1306 receives the cell configuration information, the first receiving unit 1301 is further configured to receive the second base station when receiving the first data sent by the base station. Downlink information sent on the PDSCH. The control unit 1303 is further configured to determine that the uplink information is sent by the second base station on the PUCCH. The sending unit 1304 is configured to send second HARQ feedback information corresponding to the data sent by the second base station in the PUCCH of the second base station. The control unit 1303 is further configured to: when the second HARQ feedback information is sent, determine to use the PUCCH of the base station to send uplink information.

Optionally, before the first receiving unit 1301 receives the first data sent by the base station, the fifth receiving unit 1307 is configured to receive a handover indication sent by the base station, where the handover indication is used to indicate that the user equipment 1300 uses the first base station. The uplink resource sends the HARQ feedback information corresponding to the data sent by the first base station or the HARQ feedback information corresponding to the data sent by the second base station by using the uplink resource of the second base station. The control unit 1303 is configured to determine whether the first data is successfully received. The sending unit 1304 is further configured to: according to the handover indication, use the uplink resource of the first base station to send the HARQ feedback information corresponding to the data sent by the first base station, or use the uplink resource of the second base station to send the data corresponding to the data sent by the second base station. HARQ feedback information.

Optionally, the sending unit 1304 is further configured to send the CQI to the base station.

Optionally, as an embodiment, in a case where the base station is the first base station that provides the secondary serving cell, the control unit 1303 may determine at least two buffers, and the first buffer in the at least two buffers. Save the first data. Specifically, when determining the at least two buffers, the control unit 1303 determines that different buffers have corresponding numbers, and the control unit 1303 may determine, according to the number, a buffer for saving and processing data usage; or the control unit 1303 may take turns. Save and process data using different buffers. The sending unit 1304 may further send the first HARQ feedback information to the second base station that provides the primary serving cell, so that the second base station feeds back the first HARQ feedback information to the base station. The second receiving unit 1302 may receive a redundancy version of the first data that the base station performs HARQ retransmission, and the control unit 1303 may process the redundancy version of the first data in the first buffer. The second receiving unit 1302 can also receive new data sent by the base station, and the control unit 1303 can process the new data in the first buffer or the second buffer in the at least two buffers. Specifically, the control unit 1303 may determine that the first data is successfully received. The first buffer saves and processes the new data, and the control unit 1303 can save and process the new data in the second buffer if it is determined that the first data is not successfully received.

According to the user equipment 1300 shown in FIG. 13, when receiving the data sent by the base station, the user equipment 1300 does not need to send the HARQ feedback to the base station, and can receive the redundancy version of the data that the base station performs HARQ retransmission. Or receive new data sent by the base station. In this way, the problem that the user equipment cannot simultaneously transmit the HARQ feedback on the PUCCH of the first base station and the PUCCH of the second base station can be solved, so that the base station can perform the HARQ operation effectively when performing inter-base station carrier aggregation.

FIG. 14 is a schematic structural diagram of a base station according to an embodiment of the present invention. The base station 1400 of FIG. 14 may perform the steps performed by the base station in FIG. 6 or FIG. 7, wherein the base station 1400 may be the first base station providing the secondary serving cell or the second base station providing the primary serving cell. The base station 1400 includes: a transmitting unit 1401, a receiving unit 1402, and a control unit 1403.

The sending unit 1401 is configured to send the first data to the user equipment on the PDSCH, where the first data is data that includes the downlink MAC CE.

It can be understood that the downlink MAC CE is the encoded MAC CE, not the original MAC CE.

The receiving unit 1402 is configured to receive HARQ feedback information sent by the user equipment, where the HARQ feedback information is carried by the uplink MAC CE sent by the user equipment on the PUSCH.

It can be understood that the uplink MAC CE is the encoded MAC CE, not the original MAC CE.

The control unit 1403 is configured to determine to send new data to the user equipment or perform HARQ retransmission on the first data.

The sending unit 1401 is further configured to send new data to the user equipment or send data for performing HARQ retransmission.

According to the base station 1400 of FIG. 14, since the MAC layer feedback mechanism is introduced, it can be improved.

The reliability of MAC CE transmission.

Optionally, the control unit 1403 is further configured to start timing when the sending unit 1401 completes the first data transmission. The control unit 1403 is specifically configured to determine to perform HARQ retransmission if the timing reaches a preset threshold and the uplink MAC CE is not received. The control unit 1403 is specifically configured to: when the uplink MAC CE is received within a preset time, determine to send new data to the user equipment. Optionally, the control unit 1403 is further configured to determine data for performing HARQ retransmission in the case of determining to perform HARQ retransmission. Specifically, the control unit 1403 is specifically configured to determine second data including the downlink MAC CE, for example, the downlink MAC CE may generate a separate MAC PDU or be multiplexed with other uplink data to generate a new MAC PDU as the second data. . The sending unit 1401 sends the second data to the user equipment. Alternatively, the control unit 1403 is specifically configured to determine a redundancy version of the first data. The transmitting unit 1401 transmits a redundancy version of the first data to the user equipment.

Optionally, the control unit 1403 is further configured to determine a maximum number of retransmissions. The sending unit 1402 is further configured to: when the number of times that the HARQ retransmission is performed reaches the maximum number of retransmissions, and the receiving unit 1402 does not receive the uplink MAC CE, send the new data to the user equipment.

FIG. 15 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. The user equipment 1500 shown in Fig. 15 can perform the various steps performed by the user equipment in Fig. 8 or Fig. 9. The user equipment 1500 includes: a receiving unit 1501, a control unit 1502, and a transmitting unit 1503.

The receiving unit 1501 is configured to receive first data that is sent by the base station on the PDSCH, where the first data is data that includes the downlink MAC CE.

The control unit 1502 is configured to determine whether the first data is successfully received and decoded.

The sending unit 1503 is configured to send, to the base station, an uplink MAC CE that carries HARQ feedback information.

Specifically, the control unit 1502 determines an uplink MAC CE in the case where it is determined that the first data is successfully received and decoded, wherein the uplink MAC CE carries the HARQ positive acknowledgement information. The transmitting unit 1503 transmits the uplink MAC CE to the base station.

The receiving unit 1501 is further configured to receive data that is sent by the base station for HARQ retransmission or new data that is sent by the base station.

Optionally, the HARQ retransmitted data is a redundancy version of the first data or a second data including the first data.

Optionally, the base station may be a first base station that provides a secondary serving cell, and the base station may also be a second base station that provides a primary serving cell. According to the user equipment 1500 of FIG. 15, since the MAC layer feedback mechanism is introduced, the reliability of the MAC CE transmission can be improved.

Optionally, the present invention provides a base station, which can perform the steps of FIG. The base station includes a transmitter and a processor.

And a transmitter, configured to send the first data to the user equipment on the PDSCH.

And a processor, configured to determine, according to the scheduling policy, whether to perform HARQ retransmission on the first data. Optionally, the base station may be a first base station that provides a secondary serving cell, and the base station may also be a second base station that provides a primary serving cell.

The base station can determine whether to perform HARQ retransmission according to the scheduling policy. This solves the problem that the user equipment cannot simultaneously transmit HARQ feedback on the PUCCH of the first base station and the PUCCH of the second base station, and cannot effectively support the HARQ operation problem of carrier aggregation between the base stations.

Optionally, the present invention provides a base station, which can perform the steps performed by the base station in Figure 1 or Figure 2. The base station includes a transmitter, a processor and a receiver. The base station may be a first base station providing a secondary serving cell, and the base station may also be a second base station providing a primary serving cell.

The processor is configured to allocate a downlink resource and a specified HARQ process ID to the user equipment in the PDCCH.

The processor is further configured to determine whether to perform HARQ retransmission on the first data according to the scheduling policy. Optionally, the receiver is configured to determine, according to the scheduling policy, whether to perform HARQ retransmission, and the method includes: a processor, where the scheduling policy is configured to always perform HARQ retransmission. The processor is specifically configured to specify that the scheduling policy is that no HARQ retransmission is performed. Or the processor is specifically configured to specify that the scheduling policy is to determine whether to perform HARQ retransmission according to an error rate of the CQI or the RLC PDU received by the receiver.

Optionally, the receiver is configured to receive first HARQ feedback information sent by the user equipment, where the first HARQ feedback information corresponds to the first data. The processor is further configured to specify that the scheduling policy is to determine whether to perform HARQ retransmission according to the first HARQ feedback information.

Optionally, the transmitter is further configured to send, to the user equipment, a handover indication, where the handover indication is used to indicate that the user equipment uses the PUCCH of the first base station to send, corresponding to the first base station, before sending the first data to the user equipment. The HARQ feedback information of the transmitted data or the HARQ feedback information corresponding to the data transmitted by the second base station is transmitted using the PUCCH of the second base station.

Optionally, in the case that the processor determines to perform HARQ retransmission, the transmitter is specifically used to New data is sent to the user equipment, and HARQ retransmission is performed in the next subframe in which the new data is transmitted. The transmitter is further configured to perform the HARQ retransmission using the same resource and modulation coding method as transmitting the new data.

Optionally, the transmitter is further configured to send a retransmission indication to the user equipment before sending the first data to the user equipment, where the retransmission indication is used to indicate that the user equipment does not need to send the first HARQ feedback information.

Optionally, the transmitter is further configured to: before the first data is sent to the user equipment, send the cell configuration information to the user equipment, where the cell configuration information is used to indicate that the user equipment sends the uplink information by using the PUCCH of the secondary serving cell. .

Optionally, as an embodiment, in a case where the base station is the first base station, before the transmitter sends data to the user equipment, the processor may be configured to determine at least two buffers for each downlink HARQ process. Specifically, the processor is configured to determine, when determining the at least two buffers, that different buffers have corresponding numbers, and the processor may be configured to determine, according to the number, a buffer for sending data and processing HARQ feedback information corresponding to the data. The buffer; or the processor may be further configured to determine to transmit data using different buffers in turn and use the buffer to process HARQ feedback information corresponding to the data. The sender can be used to send data using one of the at least two buffers and another data to send another data. The receiver may be configured to receive HARQ feedback information sent by the user equipment by using the second base station, and the processor is configured to determine, according to the HARQ feedback information, whether to perform HARQ retransmission. Specifically, when receiving the HARQ feedback information, the receiver may further be configured to receive one or more of a HARQ process ID, HARQ time information, and buffer index information corresponding to the HARQ feedback information. The processor is configured to determine, according to one or more of the HARQ process ID, the HARQ time information, and the buffer index information, a used buffer, where the processor may be configured to determine, according to the HARQ feedback, the HARQ feedback corresponding to the HARQ feedback. The data is retransmitted, or it is determined that new data is sent to the user equipment in the buffer. In addition, the processor is further configured to expire one or more HARQ loop times (RTTs) after the data is sent in one of the at least two buffers, and the user equipment is not received through the second In the case where the base station transmits HARQ feedback information corresponding to the data, it is determined to transmit new data using another buffer of the at least two buffers. The transmitter is further configured to send a redundant version of the first data using the first buffer or to transmit new data using the first buffer or the second buffer.

For example, before the sender sends the first data to the user equipment, the processor can be used for The first downlink HARQ process in which the data is located determines at least two buffers. The sender may be configured to send the first data to the user equipment using the first one of the at least two buffers. The receiver may be configured to receive first HARQ feedback information sent by the user equipment by using the second base station. The receiver may be further configured to receive one or more of the following: the first HARQ process ID, the first HARQ time information, and the first buffer index information, where the first HARQ process ID, the first HARQ time information And the first buffer index information corresponds to the first HARQ feedback information. The processor may be configured to determine, according to the first HARQ feedback information, performing HARQ retransmission or transmitting new data on the first data by using the first buffer in the at least two buffers. Specifically, the processor determines, according to the first HARQ feedback information, whether to perform HARQ retransmission on the first data. The processor determines, according to the first HARQ process ID, the first HARQ time information, or the first buffer index information, a first buffer in the at least two buffers for processing the first HARQ feedback. In addition, the processor determines to use the second one of the at least two buffers when one or more HARQ RTTs after the first data is transmitted expires and the base station does not receive the first HARQ feedback sent by the second base station. Buffer, and send the new data on the same HARQ process. The transmitter is further configured to send a redundant version of the first data using the first buffer, or send the new data using the first buffer or the second buffer.

Optionally, the embodiment of the present invention provides a user equipment, where the user equipment can perform various steps performed by the user equipment in FIG. The user equipment includes: a receiver and a processor.

The receiver is configured to receive first data that is sent by the base station on the PDSCH.

a processor, configured to process the first data.

The receiver is further configured to receive a redundancy version of the first data that the base station performs HARQ retransmission according to the scheduling policy, or receive new data that is sent by the base station according to the scheduling policy.

The processor is further configured to process a redundant version of the first data or process the new data.

When receiving the data sent by the base station, the user equipment does not need to send the HARQ feedback to the base station, and can receive the redundancy version of the data that the base station performs HARQ retransmission, or receive the new data sent by the base station. In this way, it can be solved that the user equipment cannot be at the same time in the first base station. The HARQ feedback is transmitted on the PUCCH of the PUCCH and the second base station, and the HARQ operation problem of carrier aggregation between the base stations cannot be effectively supported.

Optionally, the embodiment of the present invention provides a user equipment, where the user equipment can perform various steps performed by the user equipment in FIG. 3 or FIG. The user equipment includes: a receiver, a receiver, a processor, a transmitter, a receiver, a receiver, and a receiver.

a processor, configured to process the first data.

The receiver is further configured to receive a redundancy version of the first data that the base station performs HARQ retransmission according to the scheduling policy, or receive new data sent by the base station according to the scheduling policy.

Optionally, the processor is further configured to determine whether the first data is successfully received. And a transmitter, configured to send first HARQ feedback information to the base station, where the first HARQ feedback information corresponds to the first data.

Optionally, before the receiver receives the first data sent by the base station, the receiver is further configured to receive a retransmission indication sent by the base station, where the retransmission indication is used to indicate that the user equipment does not need to send the corresponding base station. HARQ feedback information of the transmitted data.

Optionally, before the receiver receives the first data sent by the base station, the receiver is further configured to receive cell configuration information sent by the base station, where the cell configuration information is used to indicate that the user equipment sends the uplink by using the PUCCH of the secondary serving cell. information.

Optionally, when the base station is the first base station and the receiver receives the cell configuration information, when receiving the first data sent by the base station, the receiver is further configured to receive downlink information sent by the second base station on the PDSCH. . The processor is further configured to determine that the uplink information is sent by the second base station on the PUCCH. And a transmitter, configured to send second HARQ feedback information corresponding to the data sent by the second base station in the PUCCH of the second base station. The processor is further configured to: when the second HARQ feedback information is sent, determine to use the PUCCH of the base station to send uplink information.

Optionally, before the receiver receives the first data sent by the base station, the receiver is further configured to receive a handover indication sent by the base station, where the handover indication is used to indicate that the user equipment sends the uplink resource corresponding to the first base station. The HARQ feedback information of the data transmitted by the first base station or the HARQ feedback information corresponding to the data sent by the second base station is transmitted by using the uplink resource of the second base station. The The processor is further configured to determine whether the first data is successfully received. The transmitter is further configured to: use the uplink resource of the first base station to send the HARQ feedback information corresponding to the data sent by the first base station, or use the uplink resource of the second base station to send the data corresponding to the second base station, according to the handover indication. HARQ feedback information.

Optionally, the transmitter is further configured to send a CQI to the base station.

Optionally, as an embodiment, in a case where the base station is the first base station that provides the secondary serving cell, the processor may determine at least two buffers, and save the first buffer in the at least two buffers. First data. Specifically, when determining the at least two buffers, the processor determines that different buffers have corresponding numbers, and the processor may determine, according to the number, a buffer for saving and processing data usage; or the processor may further use different The buffer saves and processes the data. The transmitter may also send first HARQ feedback information to the second base station providing the primary serving cell, so that the second base station feeds back the first HARQ feedback information to the base station. The receiver may receive a redundancy version of the first data that the base station performs HARQ retransmission, and the processor may process the redundancy version of the first data in the first buffer. The receiver can also receive new data sent by the base station, and the processor can process the new data in the first buffer or the second buffer in the at least two buffers. Specifically, the processor may save and process the new data in the first buffer if it is determined that the first data is successfully received, and the processor may be in the second buffer if it is determined that the first data is not successfully received. Save and process this new data.

When receiving the data sent by the base station, the user equipment does not need to send HARQ feedback to the base station, and can receive a redundancy version of the data that the base station performs HARQ retransmission, or receive new data sent by the base station. In this way, it can be solved that the user equipment cannot simultaneously transmit HARQ feedback on the PUCCH of the first base station and the PUCCH of the second base station, and cannot effectively support the HARQ operation problem of carrier aggregation between the base stations.

Optionally, the embodiment of the present invention provides a base station, where the base station may perform the steps performed by the base station in FIG. 6 or FIG. 7, where the base station may be the first base station that provides the secondary serving cell, or may provide the primary serving cell. The second base station. The base station includes: a transmitter, a receiver, and a processor.

And a transmitter, configured to send the first data to the user equipment on the PDSCH, where the first data is data that includes a downlink MAC CE.

a receiver, configured to receive HARQ feedback information sent by the user equipment, where the HARQ The feedback information is carried by the uplink MAC CE sent by the user equipment on the PUSCH.

And a processor, configured to determine to send new data to the user equipment or perform HARQ retransmission on the first data.

The transmitter is further configured to send new data to the user equipment or send data for HARQ retransmission.

Since the base station introduces a MAC layer feedback mechanism, the reliability of the MAC CE transmission can be improved.

Optionally, the processor is further configured to start timing when the transmitter completes the first data transmission. The processor is specifically configured to determine to perform HARQ retransmission if the timing reaches a preset threshold and the uplink MAC CE is not received. The processor is specifically configured to: when the uplink MAC CE is received within a preset time, determine to send new data to the user equipment.

Optionally, the processor is further configured to determine data for performing HARQ retransmission when determining to perform HARQ retransmission. Specifically, the processor is specifically configured to determine second data including the downlink MAC CE, for example, the downlink MAC CE may generate a separate MAC PDU or be multiplexed with other uplink data to generate a new MAC PDU as the second data. The sender sends the second data to the user equipment. Alternatively, the processor is specifically configured to determine a redundancy version of the first data. The sender sends a redundant version of the first data to the user device.

Optionally, the processor is also used to determine the maximum number of retransmissions. Transmitter, also used for

The number of HARQ retransmissions reaches the maximum number of retransmissions, and if the receiver does not receive the uplink MAC CE, new data is sent to the user equipment.

Optionally, the embodiment of the present invention provides a user equipment, where the user equipment can perform various steps performed by the user equipment in FIG. 8 or FIG. The user equipment includes: a receiver, a processor, and a transmitter.

And a receiver, configured to receive first data that is sent by the base station on the PDSCH, where the first data is data that includes a downlink MAC CE.

a processor, configured to determine whether the first data is successfully received and decoded.

And a transmitter, configured to send, to the base station, an uplink MAC CE that carries the HARQ feedback information. Specifically, the processor determines the uplink in the case of determining that the first data is successfully received and decoded.

The MAC CE, where the uplink MAC CE carries the HARQ positive acknowledgement information. The sender sends the upstream MAC CE to the base station.

The receiver is further configured to receive data sent by the base station for HARQ retransmission or new data sent by the base station.

According to the user equipment of FIG. 15, since the MAC layer feedback mechanism is introduced, the reliability of the MAC CE transmission can be improved.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in a combination of electronic hardware or computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

It will be apparent to those skilled in the art that, for the convenience of the description and the cleaning process, the specific operation of the system, the device and the unit described above may be referred to the corresponding processes in the foregoing method embodiments, and details are not described herein again.

In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed. In addition, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. You can choose some of them according to actual needs or All units are used to achieve the objectives of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention, which is essential to the prior art or part of the technical solution, may be embodied in the form of a software product stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program code. .

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any change or replacement that can be easily conceived by those skilled in the art within the technical scope of the present invention is All modifications are intended to be included within the scope of the invention, and the scope of the invention should be determined by the scope of the appended claims.

Claims

Rights request

1. A method of transmitting data, characterized in that the method is executed by a first base station that provides a secondary serving cell or a second base station that provides a primary serving cell, and the first base station and the second base station perform inter-base station communication. Carrier aggregation, including:

Send the first data to the user equipment on the physical downlink shared channel PDSCH;

According to the scheduling policy, it is determined whether to perform hybrid automatic repeat request HARQ retransmission on the first data.

2. The method of claim 1, wherein determining whether to perform HARQ retransmission of the first data according to the scheduling policy includes:

Always perform HARQ retransmission; or

Never perform HARQ retransmission; or

Determine whether to perform HARQ retransmission based on the error rate of the channel quality indicator CQI sent by the user equipment or the received wireless link control RLC protocol data unit PDU; or

Determine whether to perform HARQ retransmission according to the first HARQ feedback information sent by the user equipment, where the first HARQ feedback information corresponds to the first data.

3. The method of claim 2, wherein when the method is executed by the first base station, the method further includes:

Determining at least two buffers for a first downlink HARQ process, wherein the first downlink HARQ process corresponds to the first data, wherein the first data is sent to the user equipment on the physical downlink shared channel PDSCH, including :

sending the first data to the user equipment on the PDSCH using a first buffer of the at least two buffers,

Determining whether to perform HARQ retransmission of the first data according to the first HARQ feedback information sent by the user equipment includes:

In the case of receiving the first HARQ feedback information sent by the user equipment through the second base station, using the first buffer to perform HARQ on the first data according to the first HARQ feedback information. retransmit or send new data,

The method also includes:

When one or more HARQ loopback times RTT expire after sending the first data and the first HARQ feedback information sent by the user equipment through the second base station is not received, use the at least The second of the two buffers sends new data.

4. The method according to claim 2, wherein in the case of determining whether to perform HARQ retransmission according to the first HARQ feedback information sent by the user equipment, in the physical downlink shared channel PDSCH Before sending the first data to the user equipment, the method further includes:

Send a switching instruction to the user equipment, where the switching instruction is used to instruct the user equipment to use uplink resources of the first base station to send HARQ feedback information corresponding to the data sent by the first base station or to use the second The uplink resources of the base station send HARQ feedback information corresponding to the data sent by the second base station.

5. The method of claim 1, wherein before sending the first data to the user equipment on the physical downlink shared channel PDSCH, the method further includes:

Send a retransmission indication to the user equipment, where the retransmission indication is used to indicate that the user equipment does not need to send first HARQ feedback information, where the first HARQ feedback information corresponds to the first data.

6. The method according to claim 2, characterized in that, in the case of determining whether to perform HARQ retransmission according to the first HARQ feedback information sent by the user equipment, on the physical downlink shared channel PDSCH, Before the user equipment sends the first data, the method further includes:

Cell configuration information is sent to the user equipment, where the cell configuration information is used to instruct the user equipment to use the PUCCH of the secondary serving cell to send the first HARQ feedback information.

7. The method according to any one of claims 1 to 6, characterized in that, when it is determined to perform HARQ retransmission, the method further includes:

sending new data to said user device;

The HARQ retransmission is performed on the first data in the next subframe after the new data is sent.

8. The method of claim 7, wherein performing the HARQ retransmission includes:

The HARQ retransmission is performed on the first data using the same resources and modulation coding method used to send the new data.

9. A method of transmitting data, characterized by including:

Receive the first data sent by the base station on the physical downlink shared channel PDSCH;

receiving a redundant version of the first data that the base station performs hybrid automatic repeat request HARQ retransmission according to the scheduling policy, or receiving new data sent by the base station according to the scheduling policy, wherein The base station is a first base station that provides a secondary serving cell or a second base station that provides a primary serving cell. The first base station and the second base station perform inter-base station carrier aggregation.

10. The method of claim 9, wherein before receiving the first data sent by the base station on the physical downlink shared channel PDSCH, the method further includes:

Receive a retransmission indication sent by the base station, where the retransmission indication is used to indicate that the user equipment does not need to send first HARQ feedback information, where the first HARQ feedback information corresponds to the first data.

11. The method of claim 9 or 10, wherein the method further includes: sending a channel quality indicator (CQI) to the base station, so that the base station determines whether to perform HARQ retransmission based on the CQI.

12. The method of claim 9, wherein: receiving a redundant version of the first data that the base station performs hybrid automatic retransmission requesting HARQ retransmission, or receiving a new redundant version of the first data sent by the base station. Before data, the method also includes:

Determine whether the first data is successfully received;

If the base station has available uplink resources, the base station uses the available uplink resources to send first HARQ feedback information to the base station, where the first HARQ feedback information corresponds to the first data.

13. The method of claim 12, wherein before receiving the first data sent by the base station on the physical downlink shared channel PDSCH, the method further includes:

Receive cell configuration information sent by the base station, where the cell configuration information is used to instruct the user equipment to use the PUCCH of the secondary serving cell to send the first HARQ feedback information.

14. The method of claim 13, wherein when the base station is the first base station, the method further includes:

When receiving the first data sent by the base station on the PDSCH, use the PUCCH of the base station to send the first HARQ feedback information;

In the event that the data sent by the second base station on the PDSCH is received, switch to using the PUCCH of the second base station to send second HARQ feedback information, where the second HARQ feedback information corresponds to the second Data sent by the base station;

After the PUCCH of the second base station sends the second HARQ feedback information, switch back to using the PUCCH of the base station to send HARQ feedback information corresponding to the data sent by the base station.

15. The method of claim 9, wherein when the base station is the first base station, the method further includes:

Determine at least two buffers for the first downlink HARQ process, and store the first data in a first buffer of the at least two buffers, wherein the first downlink HARQ process corresponds to the first data;

Determine whether the first data is successfully received;

Send the first HARQ feedback information to the second base station, so that the second base station forwards the first HARQ feedback information to the base station, where the first HARQ feedback information corresponds to the first data;

Receive the redundant version of the first data sent by the base station for HARQ retransmission, and process the redundant version of the first data in the first buffer;

New data sent by the base station is received, and the new data is processed in the first buffer or in a second buffer of the at least two buffers.

16. The method of claim 9, wherein before receiving the first data sent by the base station on the physical downlink shared channel PDSCH, the method further includes:

Receive a handover instruction sent by the base station, where the handover instruction is used to instruct the user equipment to use the uplink resource of the first base station to send HARQ feedback information corresponding to the data sent by the first base station or to use the second base station. The uplink resources of the base station send HARQ feedback information corresponding to the data sent by the second base station;

According to the handover instruction, use the uplink resources of the first base station to send HARQ feedback information corresponding to the data sent by the first base station or use the uplink resources of the second base station to send HARQ feedback information corresponding to the data sent by the second base station. HARQ feedback information of data.

17. A method of transmitting data, characterized in that the method is performed by the first base station of the secondary serving cell that provides inter-base station carrier aggregation or by the second base station of the primary serving cell that provides inter-base station carrier aggregation, including:

Send the first data to the user equipment on the physical downlink shared channel PDSCH, where the first data is data including the downlink medium access control MAC layer control element CE;

After receiving the hybrid automatic repeat request HARQ feedback information sent by the user equipment, sending new data to the user equipment, wherein the HARQ feedback information is sent by the user equipment on the uplink physical uplink shared channel PUSCH. MAC CE portability;

In the case where the HARQ feedback information sent by the user equipment is not received, the The first data undergoes HARQ retransmission.

18. The method of claim 17, wherein when the method is executed by the second base station providing the primary serving cell, the method further includes:

Before sending the first data to the user equipment on the physical downlink shared channel PDSCH, receiving the first data sent by the first base station;

After receiving the HARQ feedback information sent by the user equipment, send the HARQ feedback information to the first base station.

19. The method according to claim 17 or 18, characterized in that, the method further includes: after completing sending the first data to the user equipment, starting timing; when the timing reaches a preset When the threshold is reached and the HARQ feedback information sent by the user equipment is not received, HARQ retransmission is performed on the first data.

20. The method according to any one of claims 17 to 19, wherein performing HARQ retransmission includes:

Send a redundant version of the first data to the user equipment; or

Determine the second data including the downlink MAC CE, and send the second data to the user equipment.

21. A method of transmitting data, characterized by including:

Receive the first data sent by the base station on the physical downlink shared channel PDSCH, where the first data is data including the downlink medium access control MAC layer control element CE;

When it is determined that the first data is successfully received and decoded, sending an uplink MAC CE carrying hybrid automatic repeat request HARQ feedback information to the base station;

Receive data sent by the base station for HARQ retransmission, where the data for HARQ retransmission is a redundant version of the first data or second data including the downlink MAC CE, or receive data sent by the base station new data,

The base station is a first base station that provides a secondary serving cell or a second base station that provides a primary serving cell. The first base station and the second base station perform inter-base station carrier aggregation.

22. The method of claim 21, wherein, when it is determined that the first data is successfully received and decoded, sending hybrid automatic repeat request HARQ feedback information to the base station, including:

When it is determined that the first data is successfully received and decoded, determine the uplink MAC

CE, the uplink MAC CE carries HARQ positive confirmation information; Send the uplink MAC CE to the base station.

23. A base station, characterized in that the base station is a first base station that provides a secondary service cell or the base station is a second base station that provides a primary service cell, including:

A sending unit, configured to send the first data to the user equipment on the physical downlink shared channel PDSCH;

The control unit is configured to determine whether to perform hybrid automatic repeat request HARQ retransmission on the first data according to the scheduling policy.

24. The base station according to claim 23, characterized in that, the base station further includes: a receiving unit, configured to receive a channel quality indicator (CQI), an error rate of a radio link control RLC protocol data unit (PDU), or an error rate sent by the user equipment. The first HARQ feedback information, wherein the first HARQ feedback information corresponds to the first data;

The control unit is specifically configured to determine whether to perform hybrid automatic repeat request HARQ retransmission based on the CQI, the error rate of the RLC PDU, or the first HARQ feedback information.

25. The base station according to claim 23, characterized in that,

The control unit is specifically configured to always perform HARQ retransmission; or

The control unit is specifically configured to never perform HARQ retransmission.

26. The base station of claim 24, wherein when the base station is the first base station that provides a secondary service cell,

The control unit is further configured to determine at least two buffers for a first downlink HARQ process, where the first downlink HARQ process corresponds to the first data;

The sending unit is specifically configured to use the first buffer in the at least two buffers to send the first data to the user equipment on the PDSCH;

The receiving unit is specifically configured to receive the first HARQ feedback information sent by the user equipment through the second base station;

The control unit is further configured to determine to use the first buffer to perform HARQ retransmission or send new data according to the first HARQ feedback information;

The control unit is also configured to expiry one or more loopback times RTT after the sending unit sends the first data and the receiving unit does not receive the first first data sent by the second base station. In the case of HARQ feedback information, determine to use the second buffer of the at least two buffers to send new data;

The sending unit is also configured to use the first buffer to send a redundant version of the first data. or use the first buffer or the second buffer to send the new data.

27. The base station according to claim 24, characterized in that,

The sending unit is also configured to send a switching instruction to the user equipment.

28. The base station according to any one of claims 23-25, characterized in that,

The sending unit is also configured to send a retransmission indication to the user equipment.

29. The base station according to any one of claims 24, characterized in that,

The sending unit is also configured to send cell configuration information to the user equipment.

30. The base station according to any one of claims 23 to 29, characterized in that, when the control unit determines to perform the HARQ retransmission,

The sending unit is specifically configured to send new data to the user equipment, and perform the HARQ retransmission in the next subframe after sending the new data.

31. The base station according to claim 30, characterized in that,

The sending unit is specifically configured to perform the HARQ retransmission using the same resources and modulation and coding method used to send the new data.

32. A user equipment, characterized by: including:

The first receiving unit is used to receive the first data sent by the base station on the physical downlink shared channel PDSCH;

The second receiving unit is configured to receive the redundant version of the first data that the base station requests HARQ retransmission according to the scheduling policy, or to receive new data sent by the base station according to the scheduling policy, wherein the The base station is a first base station that provides a secondary serving cell or a second base station that provides a primary serving cell. The first base station and the second base station perform inter-base station carrier aggregation.

33. The user equipment according to claim 32, characterized in that the user equipment further includes:

The third receiving unit is configured to receive the retransmission indication sent by the base station.

34. The user equipment according to claim 32 or 33, characterized in that the user equipment further includes:

A sending unit, configured to send a channel quality indicator CQI to the base station.

35. The user equipment according to claim 32, characterized in that the user equipment further includes:

A control unit, used to determine whether the first data is successfully received;

A sending unit, configured to send first HARQ feedback information to the base station, wherein the first HARQ feedback information corresponds to the first data.

36. The user equipment according to claim 35, characterized in that the user equipment further includes:

The fourth receiving unit is configured to receive the cell configuration information sent by the base station.

37. The user equipment according to claim 36, wherein when the base station is the first base station,

The sending unit is specifically configured to use the PUCCH of the base station to send the first HARQ feedback information when the first receiving unit receives the first data sent by the base station on the PDSCH;

The first receiving unit is also used to receive data sent by the second base station;

The sending unit is further configured to switch to using the PUCCH of the second base station to send the second HARQ feedback information when the first receiving unit receives the data sent by the second base station, wherein the first The second HARQ feedback information corresponds to the data sent by the second base station;

The sending unit is further configured to switch back to using the PUCCH of the base station to send HARQ feedback information corresponding to the data sent by the base station after the PUCCH of the second base station sends the second HARQ feedback information.

38. The user equipment according to claim 32, wherein when the base station is the first base station, the user equipment further includes:

A control unit configured to determine at least two buffers for the first downlink HARQ process, and store the first data in a first buffer of the at least two buffers, where the first downlink HARQ process corresponds to in the first data;

The control unit is also used to determine whether the first data is successfully received;

A sending unit, configured to send first HARQ feedback information to the second base station, where the first HARQ feedback information corresponds to the first data;

The control unit is also configured to process the redundant version of the first data received by the second receiving unit in the first buffer;

The control unit is further configured to process the new data received by the second receiving unit in the first buffer or in the second buffer of the at least two buffers.

39. The user equipment according to claim 32, characterized in that the user equipment further includes:

The fifth receiving unit is used to receive the switching instruction sent by the base station; A sending unit, configured to use uplink resources of the first base station to send HARQ feedback information corresponding to the data sent by the first base station according to the handover instruction or use uplink resources of the second base station to send HARQ feedback information corresponding to the data sent by the second base station. HARQ feedback information of data sent by the second base station.

40. A base station, characterized in that the base station is a first base station that provides a secondary service cell or the base station is a second base station that provides a primary service cell, including:

A sending unit, configured to send the first data to the user equipment on the physical downlink shared channel PDSCH, where the first data is data containing the downlink medium access control MAC layer control element CE;

A receiving unit configured to receive hybrid automatic repeat request HARQ feedback information sent by the user equipment, wherein the HARQ feedback information is carried by the uplink MAC CE sent by the user equipment on the physical uplink shared channel PUSCH;

A control unit configured to determine HARQ retransmission of the first data when the receiving unit does not receive the HARQ feedback information;

The control unit is also configured to determine to send new data to the user equipment when the receiving unit receives the HARQ feedback information;

The sending unit is also configured to send the new data or data for HARQ retransmission to the user equipment.

41. The base station according to claim 40, wherein when the base station is the second base station,

The receiving unit is further configured to receive the first data sent by the first base station; the sending unit is further configured to send the HARQ feedback information to the first base station.

42. The base station according to claim 40 or 41, characterized in that,

The control unit is also configured to start timing when the sending unit completes sending the first data to the user equipment;

The control unit is specifically configured to determine to perform HARQ retransmission of the first data when the timing reaches a preset threshold and the HARQ feedback information sent by the user equipment is not received.

43. The base station according to any one of claims 40 to 42, characterized in that,

The sending unit is specifically configured to send the redundant version of the first data to the user equipment; or

The control unit is also configured to determine the second data including the downlink MAC CE; A sending unit, specifically configured to send the second data to the user equipment.

44. A user equipment, characterized by: including:

The receiving unit is used to receive the first data sent by the base station on the physical downlink shared channel PDSCH, where the first data is data containing the downlink media access control MAC layer control element CE; the control unit is used to determine whether the reception is successful and Decode the first data;

A sending unit, configured to send an uplink MAC CE carrying hybrid automatic repeat request HARQ feedback information to the base station;

The receiving unit is also configured to receive data sent by the base station for HARQ retransmission, where the data for HARQ retransmission is a redundant version of the first data or second data including the downlink MAC CE. , or receive new data sent by the base station,

45. The user equipment according to claim 44, characterized in that,

The control unit is specifically configured to determine the uplink MAC CE when it is determined that the first data is successfully received and decoded, and the uplink MAC CE carries HARQ positive confirmation information.

46. A base station, characterized in that the base station is a first base station that provides a secondary service cell or the base station is a second base station that provides a primary service cell, including:

The transmitter is configured to send the first data to the user equipment on the physical downlink shared channel PDSCH; the processor is configured to determine whether to perform hybrid automatic repeat request HARQ retransmission on the first data according to the scheduling policy.

47. The base station of claim 46, wherein the base station further includes: a receiver, configured to receive a channel quality indicator (CQI), an error rate of a radio link control RLC protocol data unit (PDU), or an error rate sent by the user equipment. The first HARQ feedback information, wherein the first HARQ feedback information corresponds to the first data;

The processor is specifically configured to determine whether to perform hybrid automatic repeat request HARQ retransmission based on the CQI, the error rate of the RLC PDU, or the first HARQ feedback information.

48. The base station according to claim 46, characterized in that,

The processor is specifically configured to always perform HARQ retransmission; or

The processor is specifically configured to never perform HARQ retransmission.

49. The base station of claim 47, wherein when the base station is the first base station that provides a secondary serving cell, The processor is further configured to determine at least two buffers for a first downlink HARQ process, where the first downlink HARQ process corresponds to the first data;

The transmitter is specifically configured to use a first buffer in the at least two buffers to send the first data to the user equipment on the PDSCH;

The receiver is specifically configured to receive the first signal sent by the user equipment through the second base station.

HARQ feedback information;

The processor is further configured to determine to use the first buffer to perform HARQ retransmission or send new data according to the first HARQ feedback information;

The processor is also configured to expiry one or more loopback times RTT after the transmitter sends the first data and the receiver does not receive the first first data sent by the second base station. In the case of HARQ feedback information, determine to use the second buffer of the at least two buffers to send new data;

The sender is further configured to use the first buffer to send a redundant version of the first data, or to use the first buffer or the second buffer to send the new data.

50. The base station according to claim 47, characterized in that,

The transmitter is also configured to send a switching instruction to the user equipment.

51. The base station according to any one of claims 46-48, characterized in that,

The transmitter is also configured to send a retransmission indication to the user equipment.

52. The base station according to any one of claims 47, characterized in that,

The transmitter is also used to send cell configuration information to the user equipment.

53. The base station according to any one of claims 46 to 52, characterized in that, when the processor determines to perform the HARQ retransmission,

The transmitter is specifically configured to send new data to the user equipment, and perform the HARQ retransmission in the next subframe after sending the new data.

54. The base station according to claim 53, characterized in that,

The transmitter is specifically configured to perform the HARQ retransmission using the same resources and modulation and coding method used to send the new data.

55. A user equipment, characterized by: including:

The receiver is used to receive the first data sent by the base station on the physical downlink shared channel PDSCH; the processor is used to process the first data;

The receiver is also used to receive a hybrid automatic retransmission request from the base station according to the scheduling policy. A redundant version of the first data retransmitted by HARQ, or receiving new data sent by the base station according to the scheduling policy;

The processor is also configured to process a redundant version of the first data or process the new data, wherein the base station is a first base station that provides a secondary serving cell or a second base station that provides a primary serving cell, The first base station and the second base station perform inter-base station carrier aggregation.

56. The user equipment according to claim 55, characterized in that,

The receiver is also configured to receive a retransmission indication sent by the base station.

57. The user equipment according to claim 55 or 56, characterized in that the user equipment further includes:

A transmitter configured to send a channel quality indicator (CQI) to the base station.

58. The user equipment according to claim 55, characterized in that,

The processor is also configured to determine whether the first data is successfully received;

The user equipment also includes:

A transmitter, configured to send first HARQ feedback information to the base station, where the first HARQ feedback information corresponds to the first data.

59. The user equipment as claimed in claim 58, characterized in that,

The receiver is also used to receive cell configuration information sent by the base station.

60. The user equipment according to claim 59, characterized in that, when the base station is the first base station,

The transmitter is specifically configured to use the PUCCH of the base station to send the first HARQ feedback information when the receiver receives the first data sent by the base station on the PDSCH;

The receiver is also used to receive data sent by the second base station;

The transmitter is further configured to switch to using the PUCCH of the second base station to send second HARQ feedback information when the receiver receives the data sent by the second base station, wherein the second HARQ The feedback information corresponds to the data sent by the second base station;

The transmitter is further configured to, after the PUCCH of the second base station sends the second HARQ feedback information, switch back to using the PUCCH of the base station to send HARQ feedback information corresponding to the data sent by the base station.

61. The user equipment according to claim 55, characterized in that, when the base station is the first base station, the processor is further configured to determine at least one for the first downlink HARQ process. Two buffers, a first buffer in the at least two buffers stores the first data, wherein the first downlink HARQ process corresponds to the first data;

The user equipment further includes: a transmitter, configured to send first HARQ feedback information to the second base station, where the first HARQ feedback information corresponds to the first data;

The processor is further configured to process a redundant version of the first data received by the second receiver in the first buffer;

The processor is further configured to process the new data received by the second receiver in the first buffer or in a second buffer of the at least two buffers.

62. The user equipment according to claim 55, characterized in that,

The receiver is also used to receive the handover instruction sent by the base station;

The user equipment also includes:

A transmitter configured to use uplink resources of the first base station to send HARQ feedback information corresponding to the data sent by the first base station according to the handover instruction or use uplink resources of the second base station to send HARQ feedback information corresponding to the data sent by the second base station. HARQ feedback information of data sent by the second base station.

63. A base station, characterized in that the base station is a first base station that provides a secondary service cell or the base station is a second base station that provides a primary service cell, including:

A transmitter, configured to send the first data to the user equipment on the physical downlink shared channel PDSCH, where the first data is data containing the downlink media access control MAC layer control element CE; a receiver, configured to receive the user equipment Hybrid automatic repeat request HARQ feedback information sent by the device, where the HARQ feedback information is carried by the uplink MAC CE sent by the user equipment on the physical uplink shared channel PUSCH;

A processor, configured to determine HARQ retransmission of the first data when the receiver does not receive the HARQ feedback information;

The processor is also configured to determine to send new data to the user equipment when the receiver receives the HARQ feedback information;

The transmitter is also configured to send the new data or data for HARQ retransmission to the user equipment.

64. The base station according to claim 63, wherein when the base station is the second base station,

The receiver is further configured to receive the first data sent by the first base station; The transmitter is also configured to send the HARQ feedback information to the first base station.

65. The base station according to claim 63 or 64, wherein the processor is further configured to start timing when the transmitter completes sending the first data to the user equipment;

The processor is specifically configured to determine to perform HARQ retransmission of the first data when the timing reaches a preset threshold and the HARQ feedback information sent by the user equipment is not received.

66. The base station according to any one of claims 63-65, characterized in that,

The sender is specifically configured to send the redundant version of the first data to the user equipment; or

The processor is further configured to determine the second data including the downlink MAC CE; the transmitter is specifically configured to send the second data to the user equipment.

67. A user equipment, characterized by including:

A receiver, configured to receive the first data sent by the base station on the physical downlink shared channel PDSCH, where the first data is data containing the downlink media access control MAC layer control element CE; a processor, configured to determine whether the reception is successful and Decode the first data;

A transmitter, configured to send an uplink MAC CE carrying hybrid automatic repeat request HARQ feedback information to the base station;

The receiver is also configured to receive data sent by the base station for HARQ retransmission, where the data for HARQ retransmission is a redundant version of the first data or second data including the downlink MAC CE. , or receive new data sent by the base station,

68. The user equipment according to claim 67, characterized in that,

The processor is specifically configured to determine the uplink MAC CE when it is determined that the first data is successfully received and decoded, and the uplink MAC CE carries HARQ positive confirmation information; the transmitter is also configured to The base station sends the uplink MAC CE.