Method and apparatus for configuring uplink hybrid automatic repeat request (HARQ) retransmission timer for narrowband communications
There is a need to support HARQ retransmission for narrow-band communications. The present disclosure provides a solution by supporting a HARQ retransmission timer for narrow-band communications. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The method for wireless communication at a user equipment may include receiving, by a user equipment (UE), a hybrid automatic repeat request (HARQ) retransmission timer, the HARQ retransmission timer indicates a time interval, identifying, by the (UE), data for uplink transmission, and starting, by the UE and after expiration of the HARQ retransmission timer, a random access procedure to obtain an uplink grant for the data.
1. A method for wireless communication at a user equipment (UE), comprising:
receiving, by the UE, control signaling indicating a hybrid automatic repeat request (HARQ) retransmission timer, the HARQ retransmission timer indicating a time interval between a transmission of uplink information and a start of a random access procedure;
identifying, by the UE, data for uplink transmission; and
starting, by the UE and after expiration of the HARQ retransmission timer, the random access procedure to obtain an uplink grant for transmitting the data.
2. The method of claim 1 , wherein the UE is a narrow-band communication device.
3. The method of claim 1 , wherein the HARQ retransmission timer is indicated in a system information block (SIB), wherein the SIB is SIB2.
4. The method of claim 1 , wherein the UE is in a connected mode.
5. The method of claim 1 , further comprising:
determining whether the HARQ retransmission timer has expired; and
waiting to start the random access procedure based at least in part on the determination that the HARQ retransmission timer has not expired.
6. The method of claim 1 , further comprising:
transmitting the uplink information to a base station; and
storing the uplink information.
7. The method of claim 6 , wherein the data for uplink transmission is identified after transmitting the uplink information to the base station.
8. The method of claim 1 , wherein the data for uplink transmission has a higher priority than the uplink information.
9. An apparatus for wireless communication, comprising:
a memory; and
one or more processors operatively coupled to the memory, the one or more processors configured to:
receive control signaling indicating a hybrid automatic repeat request (HARQ) retransmission timer, the HARQ retransmission timer indicating a time interval between a transmission of uplink information and a start of a random access procedure;
identify data for uplink transmission; and
start, after expiration of the HARQ retransmission timer, the random access procedure to obtain an uplink grant for transmitting the data.
10. The apparatus of claim 9 , wherein the apparatus is a narrow-band communication device.
11. The apparatus of claim 9 , wherein the HARQ retransmission timer is indicated in a system information block (SIB), and wherein the SIB is SIB2.
12. The apparatus of claim 9 , wherein the apparatus is in a connected mode.
13. The apparatus of claim 9 , the one or more processors further configured to:
determine whether the HARQ retransmission timer has expired; and
wait to start the random access procedure based at least in part on the determination that the HARQ retransmission timer has not expired.
14. The apparatus of claim 9 , the one or more processors further configured to:
output the uplink information for transmission to a base station; and
store the uplink information.
15. The apparatus of claim 14 , wherein the data for uplink transmission is identified after transmitting the uplink information to the base station.
16. The apparatus of claim 9 , wherein the data for uplink transmission has a higher priority than the uplink information.
17. An apparatus for wireless communication, comprising:
means for receiving control signaling indicating a hybrid automatic repeat request (HARQ) retransmission timer, the HARQ retransmission timer indicating a time interval between a transmission of uplink information and a start of a random access procedure;
means for identifying data for uplink transmission; and
means for starting, after expiration of the HARQ retransmission timer, the random access procedure to obtain an uplink grant for transmitting the data.
18. The apparatus of claim 17 , wherein the apparatus is a narrow-band communication device.
19. The apparatus of claim 17 , the HARQ retransmission timer is indicated in a system information block (SIB), wherein the SIB is SIB2.
20. The apparatus of claim 17 , wherein the apparatus is in a connected mode.
21. The apparatus of claim 17 , further comprising:
means for determining whether the HARQ retransmission timer has expired; and
means for waiting to start the random access procedure based at least in part on the determination that the HARQ retransmission timer has not expired.
22. The apparatus of claim 17 , further comprising:
means for transmitting the uplink information to a base station; and
means for storing the uplink information.
23. The apparatus of claim 22 , wherein the data for uplink transmission is identified after transmitting the uplink information to the base station.
24. The apparatus of claim 17 , wherein the data for uplink transmission has a higher priority than the uplink information.
25. A user equipment, comprising:
a transceiver configured to receive control signaling indicating a hybrid automatic repeat request (HARQ) retransmission timer, the HARQ retransmission timer indicating a time interval between a transmission of uplink information and a start of a random access procedure;
a memory; and
one or more processors operatively coupled to the memory, the one or more processors configured to:
identify data for uplink transmission; and
start, after expiration of the HARQ retransmission timer, the random access procedure to obtain an uplink grant for transmitting the data.
26. The user equipment of claim 25 , wherein the user equipment is a narrow-band communication device.
27. The user equipment of claim 25 , wherein the HARQ retransmission timer is indicated in a system information block (SIB), and wherein the SIB is SIB2.
28. The user equipment of claim 25 , wherein the user equipment is in a connected mode.
29. The user equipment of claim 25 , the one or more processors further configured to:
determine whether the HARQ retransmission timer has expired; and
wait to start the random access procedure based at least in part on the determination that the HARQ retransmission timer has not expired.
30. The user equipment of claim 25 , wherein:
the transceiver is further configured to transmit the uplink information to a base station; and
the one or more processors are further configured to store the uplink information.