Method and base station identifying PUCCH for processing feedback of user equipment

A data transmission method, comprising:

• sending, by a secondary base station, an identifier of a first physical uplink control channel (PUCCH) code channel resource to a primary base station at a first moment, so that the primary base station determines to receive, by using the first PUCCH code channel resource, a feedback that is on one or more first data blocks and that is sent by user equipment (UE);
• sending, by the secondary base station, the identifier of the first PUCCH code channel resource and the one or more first data blocks to the UE at a second moment;
• and
• receiving, by the secondary base station, the feedback from the primary base station, wherein the feedback is received by the primary base station from the UE by using the first PUCCH code channel resource;
• wherein the second moment is later than the first moment, an interval T between the second moment and the first moment is greater than or equal to a delay t of one-time inter-station unidirectional transmission between the secondary base station and the primary base station, the secondary base station serves a secondary component carrier of the UE, and the primary base station serves a primary component carrier of the UE,
• wherein a first hybrid automatic repeat request (HARQ) buffer and a second HARQ buffer are disposed on the secondary base station, and the method further comprises:
• if the feedback comprises a negative acknowledgment (NACK) and all HARQ processes in the first HARQ buffer are in a waiting state, retransmitting, by the secondary base station, retransmission data to the UE by using an HARQ process in the second HARQ buffer, wherein the retransmission data comprises a data block, in the one or more first data blocks, corresponding to the NACK.

A data transmission method, comprising:

• receiving, by a primary base station, a service of a delay insensitive data service type before a first moment;
• receiving, by the primary base station from a secondary base station at the first moment, an identifier that is of a first physical uplink control channel (PUCCH) code channel resource and x, wherein x is a quantity of the first data blocks to be sent by the secondary base station to a user equipment (UE) at a second moment;
• before the second moment, sending, by the primary base station, the x first data blocks to the secondary base station;
• receiving, by the primary base station by using the first PUCCH code channel resource, a feedback sent by the UE, wherein the feedback is a feedback, of the UE, on the x first data blocks sent by the secondary base station at the second moment;
• and
• sending, by the primary base station, the feedback to the secondary base station;
• wherein the second moment is later than the first moment, an interval T between the second moment and the first moment is greater than or equal to a delay t of one-time inter-station unidirectional transmission between the secondary base station and the primary base station, the secondary base station serves a secondary component carrier of the UE, and the primary base station serves a primary component carrier of the UE.

A base station, comprising,

• a bus;
• a memory configured to store a computer instruction;
• and
• a processor, connected to the memory via the bus, configured to execute the computer instruction to:
• determine x before a first moment, wherein x is a quantity of first data blocks to be transmitted from the base station to user equipment (UE) at a second moment;
• send an identifier of a first physical uplink control channel (PUCCH) code channel resource to a first base station at the first moment, so that the first base station determines to receive, by using the first PUCCH code channel resource, a feedback that is on the x first data blocks and that is sent by the UE;
• receive, before the second moment, the x first data blocks from one of the first base station or from a buffered service;
• send the identifier of the first PUCCH code channel resource and the x first data blocks to the UE at the second moment;
• and
• receive the feedback from the first base station, wherein the feedback is received by the first base station from the UE by using the first PUCCH code channel resource;
• wherein the second moment is later than the first moment, an interval T between the second moment and the first moment is greater than or equal to a delay t of one-time inter-station unidirectional transmission between the base station and the first base station, the base station serves a secondary component carrier of the UE, and the first base station serves a primary component carrier of the UE.

A base station, comprising:

• a bus;
• a memory configured to store a computer instruction, the memory comprising a first hybrid automatic repeat request (HARQ) buffer and a second HARQ buffer;
• and
• a processor, connected to the memory via the bus, configured to execute the computer instruction to:
• send an identifier of a first physical uplink control channel PUCCH code channel resource to a first base station at a first moment, so that the first base station determines to receive, by using the first PUCCH code channel resource, a feedback that is on one or more first data blocks and that is sent by user equipment UE;
• send the identifier of the first PUCCH code channel resource and the one or more first data blocks to the UE at a second moment;
• receive the feedback from the first base station, wherein the feedback is received by the first base station from the UE by using the first PUCCH code channel resource;
• wherein the second moment is later than the first moment, an interval T between the second moment and the first moment is greater than or equal to a delay t of one-time inter-station unidirectional transmission between the base station and the first base station, the base station serves a secondary component carrier of the UE, and the first base station serves a primary component carrier of the UE;
• and
• if the feedback comprises a negative acknowledgment (NACK) and all HARQ processes in the first HARQ buffer are in a waiting state, retransmit retransmission data to the UE by using an HARQ process in the second HARQ buffer, wherein the retransmission data comprises a data block, in the one or more first data blocks, corresponding to the NACK.

A base station, comprising:

• a bus;
• a memory configured to store a computer instruction;
• and
• a processor, connected to the memory via the bus, configured to execute the computer instruction to:
• receive a service of a delay insensitive data service type before a first moment;
• receive, from a second base station at the first moment, an identifier that is of a first physical uplink control channel PUCCH code channel resource and x, wherein x is a quantity of the first data blocks to be sent by a second base station to a user equipment (UE) at a second moment;
• before the second moment, send the x first data blocks to the second base station;
• receive, by using the first PUCCH code channel resource, a feedback sent by the UE, wherein the feedback is a feedback, of the UE, on the x first data blocks sent by the second base station at the second moment;
• and
• send the feedback to the second base station;
• wherein the second moment is later than the first moment, an interval T between the second moment and the first moment is greater than or equal to a delay t for performing one-time transmission between the second base station and the base station, the second base station serves a secondary component carrier of the UE, and the base station serves a primary component carrier of the UE.