Uplink inter-cell coordination method and base station
Embodiments of the present invention provide an uplink inter-cell coordination method. The method include: determining, by a first base station, whether first uplink data sent by user equipment UE and forwarded by a second base station is received before a first moment; if the first base station determines that the first uplink data is not received before the first moment, performing, by the first base station, demodulation and decoding of second uplink data received from the UE, and if an incorrect demodulation and decoding result is obtained, suspending, by the first base station, an HARQ process and determining whether the first uplink data forwarded by the second base station is received between the first moment and a second moment, where the second moment is later than the first moment.
1. A base station, comprising a non-transitory computer-readable medium coupled to the at least one processor and storing programming instructions for execution by the at least one processor, the programming instructions, when executed, instruct the processor to:
determine whether first uplink data sent by user equipment (UE) and forwarded by a second base station is received before a first moment, wherein a serving cell of the UE belongs to the first base station, and a coordinated cell of the UE belongs to the second base station;
perform demodulation and decoding of second uplink data received from the UE if the first uplink data is not received before the first moment, and suspend a hybrid automatic repeat request (HARQ) process if an incorrect demodulation and decoding result is obtained;
determine whether the first uplink data forwarded by the second base station is received between the first moment and a second moment; and
if the first uplink data is received between the first moment and the second moment, wherein the second moment is later than the first moment, perform joint demodulation and decoding of the first uplink data and the second uplink data and determine a demodulation and decoding result, or determine a demodulation and decoding result according to first data forwarded by the second base station, wherein the first data is data obtained after the second base station performs demodulation and decoding of the first uplink data.
2. The base station according to claim 1 , further comprising a transceiver configured to:
obtain transmission quality when the UE sends uplink data, wherein the uplink data comprises the first uplink data and the second uplink data, and the transmission quality comprises a signal-to-noise ratio (SNR), a signal to interference plus noise ratio (SINR), or a modulation and coding scheme (MCS) of the UE; and
send an indication signal to the UE according to the transmission quality obtained by the transceiver, wherein the indication signal is used to instruct the UE to enter a transmission time interval bundling (TTI Bundling) state to send the uplink data.
3. The base station according to claim 1 , wherein the at least one processor is configured to:
send an acknowledgement signal (ACK) to the UE and skip sending transmission indication information of the HARQ process to the UE, wherein the transmission indication information is used to instruct the UE to continue to send a next piece of uplink data.
4. The base station according to claim 1 , wherein the at least one processor is configured to:
perform joint demodulation and decoding of the second uplink data received from the UE and the first uplink data forwarded by the second base station; and
determine that the demodulation and decoding result is correct if the demodulation and decoding is correct, or determine that the demodulation and decoding result is incorrect if the demodulation and decoding is incorrect.
5. The base station according to claim 1 , wherein:
the first data comprises a data bit and result indication information that are obtained after the second base station performs demodulation and decoding of the first uplink data; and
the at least one processor is configured to:
determine that the demodulation and decoding result is correct, if the demodulation and decoding of the first uplink data performed by the second base station is correct and the result indication information indicates that the demodulation and decoding is correct, or
determine that the demodulation and decoding result is incorrect, if the demodulation and decoding of the first uplink data performed by the second base station is incorrect and the result indication information indicates that the demodulation and decoding is incorrect.
6. The base station according to claim 1 , further comprising a transceiver configured to:
send retransmission indication information to the UE if the first base station determines, after the second moment, that the demodulation and decoding result is incorrect, wherein the retransmission indication information is used to instruct the UE to retransmit the uplink data; or
send the transmission indication information to the UE if the first base station determines, after the second moment, that the demodulation and decoding result is correct.
7. An uplink inter-cell coordination method, comprising:
determining, by a first base station, whether first uplink data sent by user equipment (UE) and forwarded by a second base station is received before a first moment, wherein a serving cell of the UE belongs to the first base station, and a coordinated cell of the UE belongs to the second base station;
performing, by the first base station, demodulation and decoding of second uplink data received from the UE if the first base station determines that the first uplink data is not received before the first moment, and suspending, by the first base station, a hybrid automatic repeat request (HARQ) process if an incorrect demodulation and decoding result is obtained, and determining whether the first uplink data forwarded by the second base station is received between the first moment and a second moment; and
if the first uplink data is received between the first moment and the second moment, wherein the second moment is later than the first moment, performing by the first base station, joint demodulation and decoding of the first uplink data and the second uplink data and determining a demodulation and decoding result, or determining, by the first base station, a demodulation and decoding result according to first data forwarded by the second base station, wherein the first data is data obtained after the second base station performs demodulation and decoding of the first uplink data.
8. The method according to claim 7 , further comprising:
obtaining, by the first base station, transmission quality when the UE sends uplink data, wherein the uplink data comprises the first uplink data and the second uplink data, and the transmission quality comprises a signal-to-noise ratio (SNR), a signal to interference plus noise ratio (SINR), or a modulation and coding scheme (MCS) of the UE; and
sending, by the first base station, an indication signal to the UE according to the transmission quality, wherein the indication signal is used to instruct the UE to enter a transmission time interval bundling (TTI Bundling) state to send the uplink data.
9. The method according to claim 7 , wherein suspending, by the first base station, a hybrid automatic repeat request (HARQ) process comprises:
sending, by the first base station, an acknowledgement signal (ACK) to the UE and skipping sending transmission indication information of the HARQ process to the UE, wherein the transmission indication information is used to instruct the UE to continue to send a next piece of uplink data.
10. The method according to claim 7 , wherein performing, by the first base station, joint demodulation and decoding of the first uplink data and the second uplink data and determining a demodulation and decoding result comprises:
performing, by the first base station, joint demodulation and decoding of the second uplink data received from the UE and the first uplink data forwarded by the second base station; and
determining, by the first base station, that the demodulation and decoding result is correct if the demodulation and decoding is correct; or determining, by the first base station, that the demodulation and decoding result is incorrect if the demodulation and decoding is incorrect.
11. The method according to claim 7 , wherein:
the first data comprises a data bit and result indication information that are obtained after the second base station performs demodulation and decoding of the first uplink data; and
determining, by the first base station, a demodulation and decoding result according to first data forwarded by the second base station comprises:
determining, by the first base station, that the demodulation and decoding result is correct, if the demodulation and decoding of the first uplink data performed by the second base station is correct and the result indication information indicates that the demodulation and decoding is correct, or
determining, by the first base station, that the demodulation and decoding result is incorrect, if the demodulation and decoding of the first uplink data performed by the second base station is incorrect and the result indication information indicates that the demodulation and decoding is incorrect.
12. The method according to claim 7 , further comprising:
sending, by the first base station, retransmission indication information to the UE if the first base station determines, after the second moment, that the demodulation and decoding result is incorrect, wherein the retransmission indication information is used to instruct the UE to retransmit the uplink data; or
sending, by the first base station, the transmission indication information to the UE if the first base station determines, after the second moment, that the demodulation and decoding result is correct.