Method of avoiding survival time failure and related devices

1 . A method of avoiding survival time (ST) failure, performed by a user equipment (UE) in a network, the method comprising:

entering radio resource control (RRC) connected state;

being configured with an uplink configured grant by a base station (BS);

being configured with pre-allocated radio resource by the BS;

being configured with an enabler with boolean values indicating Packet Data Convergence Protocol (PDCP) duplication for retransmitting the data on the pre-allocated radio resource associated with one or more Radio Link Control (RLC) entity is activated;

transmitting data on the uplink configured grant;

receiving Hybrid Automatic Repeat reQuest (HARQ) information for the data; and

entering a survival state and retransmitting data on the pre-allocated radio resource;

wherein the pre-allocated radio resource is one or more uplink configured grants different from the uplink configured grant.

2 . The method of claim 1 , wherein the PDCP duplication is activated to retransmit the data if the data is not successfully transmitted on the uplink configured grant.

3 . The method of claim 1 , wherein the pre-allocated radio resource is at least one Radio Link Control (RLC) entity for the PDCP duplication.

4 . The method of claim 1 , wherein the PDCP duplication is triggered by Hybrid Automatic Repeat reQuest (HARQ) information.

5 . The method of claim 4 , wherein the activating the PDCP duplication comprises:

activating the PDCP duplication if a negative acknowledgment (NACK) for the data on the uplink configured grant or a number of NACK for the data on the uplink configured grant is received.

6 . The method of claim 5 , wherein the number of NACK is configured based on a stringent degree of the UE.

7 . The method of claim 1 , wherein the PDCP duplication is triggered by duplication activation/deactivation Medium Access Control (MAC) Control Element (CE), or status reporting of RLC Protocol Data Unit (PDU), or PDCP status report.

8 . A user equipment (UE), communicating with a base station (BS) in a network, the UE comprising:

a memory, configured to store program instructions;

a transceiver, configured to transmit and receive data; and

a processor, coupled to the memory and the transmitter, configured to call and run the program instructions stored in a memory, to cooperate with the memory to execute the method of claim 1 .

9 . The method of claim 1 , further comprising:

deactivating the PDCP duplication after receiving a certain number of positive acknowledgement (ACKs) for the data on the configured grant for the UE-based PDCP duplication.

10 . The method of claim 9 , further comprising:

transmitting an indication to the base station to notify the deactivation of the PDCP duplication.

11 . A method of avoiding survival time (ST) failure, performed by a base station (BS) in a network, the method comprising:

configuring a user equipment (UE) with an uplink configured grant;

configuring the UE with pre-allocated radio resource;

configuring the UE with an enabler with boolean values indicating Packet Data Convergence Protocol (PDCP) duplication for retransmitting data on the pre-allocated radio resource associated with one or more Radio Link Control (RLC) entity is activated, wherein the UE is in radio resource control (RRC) connected state;

receiving data on the uplink configured grant from the UE;

transmitting a Hybrid Automatic Repeat reQuest (HARQ) information for the data to the UE;

dedicating the pre-allocated radio resource to the UE for receiving retransmitted data, from the UE, on the pre-allocated radio resource for PDCP duplication;

receiving retransmitted data on the pre-allocated radio resource from the UE, and

wherein the pre-allocated radio resource is one or more uplink configured grants different from the uplink configured grant.

12 . The method of claim 11 , wherein the pre-allocated radio resource is dedicated to the UE for receiving the retransmitted data on the pre-allocated radio resource if the data is not successfully received by the base station.

13 . The method of claim 11 , wherein the pre-allocated radio resource is at least one Radio Link Control (RLC) entity for the PDCP duplication.

14 . The method of claim 11 , wherein the dedicating the pre-allocated radio resource to the UE comprises:

dedicating the pre-allocated radio resource including the PDCP duplication to the UE based on Hybrid Automatic Repeat reQuest (HARQ) information transmitted to the UE.

15 . The method of claim 14 , wherein the dedicating the pre-allocated radio resource to the UE comprises:

dedicating the pre-allocated radio resource including the PDCP duplication to the UE if a negative acknowledgment (NACK) for the data on the uplink configured grant or a number of NACK for the data on the uplink configured grant is transmitted to the UE.

16 . A base station (BS), communicating with a user equipment (UE) in a network, the BS comprising:

a memory, configured to store program instructions;

a transceiver, configured to transmit and receive data; and

a processor, coupled to the memory and the transmitter, configured to call and run the program instructions stored in a memory, to cooperate with the memory to execute the method of claim 11 .

17 . The method of claim 11 , further comprising:

deactivating the PDCP duplication after transmitting a certain number of ACKs for the data on the configured grant for the PDCP duplication.

18 . The method of claim 17 , further comprising:

transmitting an indication to the UE to notify the deactivation of the PDCP duplication.