Method and apparatus for handling out-of-order uplink scheduling in mobile communications

1. A method, comprising:

receiving, by a processor of an apparatus, a first control signal scheduling a first uplink transmission;

receiving, by the processor, a second control signal scheduling a second uplink transmission;

determine, by the processor, whether the second uplink transmission is scheduled earlier than the first uplink transmission; and

dropping, by the processor, the first uplink transmission in an event that the second uplink transmission is scheduled earlier than the first uplink transmission,

wherein the determining comprises:

determining whether a first symbol of the first uplink transmission is within a predetermined symbols after a last symbol of the second uplink transmission; or

determining whether a last symbol of the first control signal is within a predetermined symbols before a first symbol of the second control signal.

2. The method of claim 1 , wherein the predetermined symbols comprises a physical uplink shared channel (PUSCH) preparation time.

3. The method of claim 1 , further comprising:

reporting, by the processor, a value of the predetermined symbols as a user equipment (UE) capability.

4. The method of claim 1 , further comprising:

ignoring, by the processor, the second control signal in an event that the second uplink transmission is scheduled earlier than the first uplink transmission.

5. The method of claim 1 , further comprising:

determining, by the processor, whether the first uplink transmission and the second uplink transmission are overlapped in time domain; and

dropping, by the processor, a part of the first uplink transmission in an event that the first uplink transmission and the second uplink transmission are overlapped in time domain.

6. A method, comprising:

receiving, by a processor of an apparatus, a first control signal scheduling a first uplink transmission;

receiving, by the processor, a second control signal scheduling a second uplink transmission;

determine, by the processor, whether the second uplink transmission is scheduled earlier than the first uplink transmission;

extending, by the processor, a preparation time of the second uplink transmission by a predetermined number of symbols in an event that the second uplink transmission is scheduled earlier than the first uplink transmission;

determining, by the processor, whether a scheduling condition is satisfied; and

performing, by the processor, both the first uplink transmission and the second uplink transmission in an event that the scheduling condition is satisfied.

7. The method of claim 6 , further comprising:

dropping, by the processor, the first uplink transmission in an event that the scheduling condition is not satisfied.

8. An apparatus, comprising:

a transceiver which, during operation, wirelessly communicates with network nodes of a wireless network; and

a processor communicatively coupled to the transceiver such that, during operation, the processor performs operations comprising:

receiving, via the transceiver, a first control signal scheduling a first uplink transmission;

receiving, via the transceiver, a second control signal scheduling a second uplink transmission;

determine whether the second uplink transmission is scheduled earlier than the first uplink transmission; and

dropping the first uplink transmission in an event that the second uplink transmission is scheduled earlier than the first uplink transmission,

wherein, in determine whether the second uplink transmission is scheduled earlier than the first uplink transmission, the processor either:

determines whether a first symbol of the first uplink transmission is within a predetermined symbols after a last symbol of the second uplink transmission; or

determines whether a last symbol of the first control signal is within a predetermined symbols before a first symbol of the second control signal.

9. The apparatus of claim 8 , wherein the predetermined symbols comprises a physical uplink shared channel (PUSCH) preparation time.

10. The apparatus of claim 8 , wherein, during operation, the processor further performs operations comprising:

reporting, via the transceiver, a value of the predetermined symbols as a user equipment (UE) capability.

11. The apparatus of claim 8 , wherein, during operation, the processor further performs operations comprising:

ignoring the second control signal in an event that the second uplink transmission is scheduled earlier than the first uplink transmission.

12. The apparatus of claim 8 , wherein, during operation, the processor further performs operations comprising:

determining whether the first uplink transmission and the second uplink transmission are overlapped in time domain; and

dropping a part of the first uplink transmission in an event that the first uplink transmission and the second uplink transmission are overlapped in time domain.

13. An apparatus, comprising:

a transceiver which, during operation, wirelessly communicates with network nodes of a wireless network; and

a processor communicatively coupled to the transceiver such that, during operation, the processor performs operations comprising:

receiving, via the transceiver, a first control signal scheduling a first uplink transmission;

receiving, via the transceiver, a second control signal scheduling a second uplink transmission;

determine whether the second uplink transmission is scheduled earlier than the first uplink transmission;

extending a preparation time of the second uplink transmission by a predetermined number of symbols in an event that the second uplink transmission is scheduled earlier than the first uplink transmission;

determining whether a scheduling condition is satisfied; and

performing both the first uplink transmission and the second uplink transmission in an event that the scheduling condition is satisfied.

14. The apparatus of claim 13 , wherein, during operation, the processor further performs operations comprising:

dropping the first uplink transmission in an event that the scheduling condition is not satisfied.