Granted Patent B2

US 12,200,688 · App. 17/288,817 · Granted Jan 14, 2025

Inventors: Bharat Shrestha (Hillsboro, OR); Seau Sian Lim (Swindon, GB); Marta Martinez Tarradell (Hillsboro, OR)

Assignee: APPLE INC.

H04W72/1268H04L1/1678H04L5/0055H04W72/23

Abstract

Claims (30)

1. An apparatus for a user equipment (UE) in a wireless network, the apparatus comprising:

a memory interface to send or receive, to or from a memory device, configuration data for a first preconfigured uplink resource, the configuration data for the first preconfigured uplink resource including a radio network temporary identifier (RNTI) for idle mode communication; and

a processor to:

in an idle mode, generate an uplink transmission comprising uplink data using the first preconfigured uplink resource;

after the uplink transmission in the idle mode using the first preconfigured uplink resource, start a retransmission timer;

while the retransmission timer is running, receive at least one of a successful identifier (ID) and an indication that a contention resolution procedure is complete;

in response to the successful ID or the indication that the contention resolution procedure is complete, enter a sleep mode;

monitor a physical downlink control channel (PDCCH) with the RNTI for the idle mode communication provided in the configuration data for a hybrid automatic repeat request (HARQ) acknowledgment (ACK) or negative acknowledgment (NACK); and

in response to the retransmission timer expiring before receiving the ACK or the NACK, determine that the uplink transmission failed and generating a retransmission comprising the uplink data in a second preconfigured uplink resource.

2. The apparatus of claim 1 , wherein the processor is further configured to, after the retransmission, restart the retransmission timer.

3. The apparatus of claim 1 , wherein the processor is further configured to, in response to the retransmission timer expiring before receiving the ACK or the NACK, initiate a fallback to early data transmission (EDT) or a random access procedure.

4. The apparatus of claim 1 , wherein the processor is further configured to:

while the retransmission timer is running, process a retransmission grant of an uplink resource; and

generate the retransmission using the uplink resource of the retransmission grant.

5. The apparatus of claim 1 , wherein the processor is further configured to, while the retransmission timer is running, process a radio resource configuration (RRC) message comprising instructions to remain in the idle mode.

6. The apparatus of claim 1 , wherein the processor is further configured to, while the retransmission timer is running, process a radio resource configuration (RRC) message comprising instructions to move from the idle mode to a connected mode.

7. The apparatus of claim 1 , wherein multiple HARQ processes are supported in the idle mode, and wherein the processor is further configured to initiate a different random access procedure for each of the multiple HARQ processes.

8. The apparatus of claim 7 , wherein at least one of a HARQ feedback message, a first grant of first uplink resources for a new transmission, and a second grant of second uplink resources for a retransmission in response to the uplink transmission using the first preconfigured uplink resource comprises a HARQ process identifier (ID).

9. The apparatus of claim 1 , wherein the processor is further configured to, while a timing advance (TA) validity timer is running, generate a message in the first preconfigured uplink resource to a base station to release the first preconfigured uplink resource.

10. The apparatus of claim 9 , wherein to generate the message comprises to generate at least one of a radio resource control (RRC) message, a media access control (MAC) control element (CE), and layer 1 (L1) signaling in the first preconfigured uplink resource.

11. A non-transitory computer-readable storage medium, the computer-readable storage medium including instructions that when executed by a processor of a user equipment (UE) in a wireless network, cause the processor to:

store configuration data for a first preconfigured uplink resource, the configuration data including a radio network temporary identifier (RNTI) for idle mode communication;

in an idle mode, generate an uplink transmission comprising uplink data using the first preconfigured uplink resource;

after the uplink transmission in the idle mode using the first preconfigured uplink resource, start a retransmission timer;

while the retransmission timer is running, receive at least one of a successful identifier (ID) and an indication that a contention resolution procedure is complete;

in response to the successful ID or the indication that the contention resolution procedure is complete, enter a sleep mode;

monitor a physical downlink control channel (PDCCH) in a common search space (CSS) with the RNTI for the idle mode communication provided in the configuration data for a hybrid automatic repeat request (HARQ) acknowledgment (ACK) or negative acknowledgment (NACK); and

in response to the retransmission timer expiring before receiving the ACK or the NACK, determine that the uplink transmission failed and generating a retransmission comprising the uplink data in a second preconfigured uplink resource.

12. The non-transitory computer-readable storage medium of claim 11 , wherein the instructions further configure the processor to, after generating the retransmission, restart the retransmission timer.

13. The non-transitory computer-readable storage medium of claim 11 , wherein the instructions further configure the processor to, in response to the retransmission timer expiring before receiving the ACK or the NACK, initiating a fallback to early data transmission (EDT) or a random access procedure.

Continuity (2)

References Cited (18)