Data transmission method and device, search space optimization method and device, and storage medium

1. A data transmission method, comprising:

sending, by a user equipment (UE), a random access preamble to a base station, and receiving, by the UE, a first response message sent by the base station, wherein the first response message is a random access response;

sending, by the UE, a first request message to the base station; and

receiving, by the UE in a first state, an uplink grant sent by the base station, and sending, by the UE, uplink data to the base station by using the uplink grant, wherein the first state comprises an idle state or an inactive state;

wherein in a case where the UE receives, before the UE receives the uplink grant sent by the base station, a second response message returned by the base station, after the UE determines that conflict resolution is successful according to the second response message, the UE remains in the first state and uses a temporary cell radio network temporary identifier as a cell radio network temporary identifier, wherein the temporary cell radio network temporary identifier is allocated by the base station and carried in the random access response.

2. The data transmission method of claim 1 , wherein the first request message carries at least one of:

an indication about whether to switch a state, an indication that the uplink data is to be sent, or an indication about whether to support a data transmission function in the first state.

3. The data transmission method of claim 1 , wherein sending, by the UE, the uplink data to the base station by using the uplink grant comprises:

in response to determining that the uplink data sent by the UE by using the uplink grant is a last uplink data packet to be sent by the UE, carrying an indication that no data to be sent exists in the uplink data when the UE sends the uplink data.

4. The data transmission method of claim 1 , wherein the second response message comprises at least one of resource configuration information or search space configuration information of the uplink grant corresponding to the uplink data detected by the UE.

5. The data transmission method of claim 4 , further comprising:

detecting, by the UE, at least one of the uplink grant or a downlink grant according to at least one of the received resource configuration information or the received search space configuration information of the uplink grant.

6. The data transmission method of claim 1 , further comprising after the UE confirms that the base station receives a last uplink data packet sent by the UE, releasing, by the UE, the cell radio network temporary identifier.

7. The data transmission method of claim 1 , further comprising after the UE confirms that the base station receives a last uplink data packet sent by the UE, in a case where the UE is monitoring a common search space having a shorter monitoring interval, switching, by the UE, back to a common search space having a longer monitoring interval.

8. The data transmission method of claim 6 , wherein the UE confirms, according to at least one of the following conditions, that the base station receives the last uplink data packet sent by the UE:

the UE fails to receive a uplink grant for retransmission sent by the base station within a preset time; or

the UE receives information about acknowledge receipt of the last uplink data packet sent by the UE, wherein the information is sent by the base station.

9. The data transmission method of claim 1 , wherein sending, by the UE, the uplink data, to the base station by using the uplink grant comprises:

determining, by the UE, whether the uplink grant is used for new transmission or retransmission; in response to determine that the uplink grant is used for the new transmission, using, by the UE, the uplink grant to send new uplink data to be transmitted;

and in response to determine that the uplink grant is used for the retransmission, using, by the UE, the uplink grant to retransmit uplink data sent before.

10. The data transmission method of claim 9 , wherein the UE determines, in one of the following manners, whether the uplink grant is used for the new transmission or the retransmission:

determining, according to a new physical-layer format indication used when the base station sends the uplink grant, whether the uplink grant is used for the new transmission or the retransmission; or

determining, according to indication information carried when the base station sends the uplink grant, whether the uplink grant is used for the new transmission or the retransmission.

11. A data transmission apparatus, comprising a memory and a processor, wherein the memory stores a program, and the program, when read and executed by the processor, performs the data transmission method of claim 1 .

12. A non-transitory storage medium, which stores one or more programs, wherein the one or more programs are executable by one or more processors to perform the data transmission method of claim 1 .

13. A data transmission method, comprising:

receiving, by a base station, a random access preamble sent by a UE, and sending, by the base station, a first response message to the UE, wherein the first response message is a random access response and carries a temporary cell radio network temporary identifier allocated by the base station;

receiving, by the base station, a first request message sent by the UE; and

sending, by the base station, an uplink grant to the UE in a first state, and receiving, by the base station, uplink data sent by the UE by using the uplink grant, wherein the first state comprises an idle state or an inactive state;

wherein in a case where the base station sends, before the base station sends the uplink grant to the UE in the first state, a second response message to the UE, wherein the UE determines that conflict resolution is successful according to the second response message, remains in the first state and uses the temporary cell radio network temporary identifier as a cell radio network temporary identifier.

14. A data transmission apparatus, comprising a memory and a processor, wherein the memory stores a program and the program, when read and executed by the processor, performs the data transmission method of claim 13 .

15. A non-transitory storage medium, which stores one or more programs, wherein the one or more programs are executable by one or more processors to perform the data transmission method of claim 13 .