Granted Patent B2

US 12,382,468 · App. 17/870,234 · Granted Aug 5, 2025

Inventors: Heng-Li Chin (Taipei, TW); Hai-Han Wang (Taipei, TW); Hsin-Hsi Tsai (Taipei, TW); Chia-Hung Wei (Taipei, TW)

Assignee: SHARP KABUSHIKI KAISHA

H04W72/23H04L1/08H04L1/1812H04W72/1263H04W80/02

Abstract

Claims (38)

1. A method performed by a User Equipment (UE) for handling a survival time state, the method comprising:

receiving, from a base station, a Packet Data Convergence Protocol (PDCP) configuration;

determining whether an indication is included in the PDCP configuration;

determining that a Data Radio Bearer (DRB) associated with a PDCP entity supports a survival time state functionality in a case that the indication is included in the PDCP configuration and indicates a specific value, wherein the PDCP entity is associated with at least two Radio Link Control (RLC) entities;

determining that the DRB associated with the PDCP entity does not support the survival time state functionality in a case that the indication is absent from the PDCP configuration;

receiving an Uplink (UL) grant for retransmission of a Medium Access Control (MAC) Protocol Data Unit (PDU), the MAC PDU including data from the DRB;

entering the survival time state for the DRB upon receiving the UL grant in a case that a counter value of a counter for counting a number of unsuccessful data transmissions is equal to a threshold; and

activating a PDCP duplication for the PDCP entity while the UE is in the survival time state.

2. The method of claim 1 , wherein

the indication is in an enumerate format.

3. The method of claim 1 , wherein the UL grant is associated with a Configured Scheduling-Radio Network Temporary Identifier (CS-RNTI).

4. The method of claim 1 , further comprising:

after activating the PDCP duplication for the PDCP entity:

duplicating a PDCP PDU; and

sending the duplicated PDCP PDU from the PDCP entity to each of the at least two RLC entities.

5. The method of claim 1 , wherein:

the UL grant includes a Hybrid Automatic Repeat Request (HARQ) process identifier (ID) of a HARQ process, and

the MAC PDU is stored in a HARQ process buffer of the HARQ process.

6. A User Equipment (UE) for handling a survival time state, the UE comprising:

at least one non-transitory computer-readable medium storing one or more computer-executable instructions; and

at least one processor coupled to the at least one non-transitory computer-readable medium and configured to execute the one or more computer-executable instructions to cause the UE to:

receive, from a base station, a Packet Data Convergence Protocol (PDCP) configuration;

determine whether an indication is included in the PDCP configuration;

determine that a Data Radio Bearer (DRB) associated with a PDCP entity supports a survival time state functionality in a case that the indication is included in the PDCP configuration and indicates a specific value, wherein the PDCP entity is associated with at least two Radio Link Control (RLC) entities;

determine that the DRB associated with the PDCP entity does not support the survival time state functionality in a case that the indication is absent from the PDCP configuration;

receive an Uplink (UL) grant for retransmission of a Medium Access Control (MAC) Protocol Data Unit (PDU), the MAC PDU including data from the DRB;

enter the survival time state for the DRB upon receiving the UL grant in a case that a counter value of a counter for counting a number of unsuccessful data transmissions is equal to a threshold; and

activate a PDCP duplication for the PDCP entity while the UE is in the survival time state.

7. The UE of claim 6 , wherein

the indication is in an enumerate format.

8. The UE of claim 6 , wherein the UL grant is associated with a Configured Scheduling-Radio Network Temporary Identifier (CS-RNTI).

9. The UE of claim 6 , wherein the one or more computer-executable instructions, when executed by the at least one processor, further cause the UE to:

after activating the PDCP duplication for the PDCP entity:

duplicate a PDCP PDU; and

send the duplicated PDCP PDU from the PDCP entity to each of the at least two RLC entities.

10. The UE of claim 6 , wherein:

the UL grant includes a Hybrid Automatic Repeat Request (HARQ) process identifier (ID) of a HARQ process, and

the MAC PDU is stored in a HARQ process buffer of the HARQ process.

Assignments (2)

Continuity (3)

References Cited (35)