Power control for random access
Systems, apparatuses, and methods are described for wireless communications. Random access procedures may include various steps, such as 4-steps or 2-steps. One or more indicators such as, for example, transmission power requirements, may be used to indicate which random access procedure to utilize.
1. A method comprising:
transmitting, by a wireless device and using a first uplink transmission power, a first message comprising a preamble for a two-step random access procedure and comprising a transport block; and
based on a determination that a response to the first message has not been received within a duration threshold and a determination that a calculated uplink transmission power associated with transmission of a second message exceeds an uplink transmission power threshold, transmitting, using a second uplink transmission power, the second message, wherein the second message comprises a preamble for a four-step random access procedure, and wherein the second uplink transmission power was adjusted from the calculated uplink transmission power to be less than or equal to the uplink transmission power threshold.
2. The method of claim 1 , further comprising determining the first uplink transmission power based on a path loss between the wireless device and a base station.
3. The method of claim 1 , wherein the second uplink transmission power is greater than the first uplink transmission power.
4. The method of claim 1 , wherein the uplink transmission power threshold corresponds to a maximum transmission power of the wireless device.
5. The method of claim 1 , wherein the uplink transmission power threshold corresponds to a configured maximum transmission power.
6. The method of claim 1 , wherein the second uplink transmission power was adjusted based on a ramp up power value.
7. The method of claim 1 , wherein the transmitting the first message comprises transmitting an uplink transmission comprising the first message and another message at least partially overlapping with the first message.
8. The method of claim 1 , wherein the second uplink transmission power comprises a total uplink transmission power.
9. The method of claim 1 , wherein the determination that a response to the first message has not been received within the duration threshold comprises a determination that a response window, for reception of a random access response (RAR), has expired.
10. The method of claim 1 , wherein the wireless device is configured for dual connectivity between New Radio (NR) and Evolved Universal Mobile Telecommunications Service Terrestrial Radio Access (E-UTRA), and wherein the transmitting the first message comprises transmitting the first message via an NR resource.
11. The method of claim 1 , further comprising receiving, from a base station, at least one configuration parameter indicating the uplink transmission power threshold.
12. The method of claim 1 , wherein the calculated uplink transmission power is adjusted from the first uplink transmission power and exceeds the uplink transmission power threshold.
13. A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, configure the wireless device to:
transmit, using a first uplink transmission power, a first message comprising a preamble for a two-step random access procedure and comprising a transport block; and
based on a determination that a response to the first message has not been received within a duration threshold and a determination that a calculated uplink transmission power associated with transmission of a second message exceeds an uplink transmission power threshold, transmit, using a second uplink transmission power, the second message, wherein the second message comprises a preamble for a four-step random access procedure, and wherein the second uplink transmission power was adjusted from the calculated uplink transmission power to be less than or equal to the uplink transmission power threshold.
14. The wireless device of claim 13 , wherein the instructions, when executed by the one or more processors, configure the wireless device to determine the first uplink transmission power based on a path loss between the wireless device and a base station.
15. The wireless device of claim 13 , wherein the second uplink transmission power is greater than the first uplink transmission power.
16. The wireless device of claim 13 , wherein the uplink transmission power threshold corresponds to a maximum transmission power of the wireless device.
17. The wireless device of claim 13 , wherein the uplink transmission power threshold corresponds to a configured maximum transmission power.
18. The wireless device of claim 13 , wherein the second uplink transmission power was adjusted based on a ramp up power value.
19. The wireless device of claim 13 , wherein the instructions, when executed by the one or more processors, configure the wireless device to transmit the first message by transmitting an uplink transmission comprising the first message and another message at least partially overlapping with the first message.
20. The wireless device of claim 13 , wherein the second uplink transmission power comprises a total uplink transmission power.
21. The wireless device of claim 13 , wherein the determination that a response to the first message has not been received within the duration threshold comprises a determination that a response window, for reception of a random access response (RAR), has expired.
22. The wireless device of claim 13 , wherein the wireless device is configured for dual connectivity between New Radio (NR) and Evolved Universal Mobile Telecommunications Service Terrestrial Radio Access (E-UTRA), and wherein the instructions, when executed by the one or more processors, configure the wireless device to transmit the first message by transmitting the first message via an NR resource.
23. The wireless device of claim 13 , wherein the instructions, when executed by the one or more processors, configure the wireless device to receive, from a base station, at least one configuration parameter indicating the uplink transmission power threshold.
24. The wireless device of claim 13 , wherein the calculated uplink transmission power is adjusted from the first uplink transmission power and exceeds the uplink transmission power threshold.
25. A non-transitory computer-readable medium storing instructions that, when executed, configure a wireless device to:
transmit, using a first uplink transmission power, a first message comprising a preamble for a two-step random access procedure and comprising a transport block; and
based on a determination that a response to the first message has not been received within a duration threshold and a determination that a calculated uplink transmission power associated with transmission of a second message exceeds an uplink transmission power threshold, transmit, using a second uplink transmission power, the second message, wherein the second message comprises a preamble for a four-step random access procedure, and wherein the second uplink transmission power was adjusted from the calculated uplink transmission power and adjusted to be less than or equal to the uplink transmission power threshold.
26. The non-transitory computer-readable medium of claim 25 , wherein the instructions, when executed, configure the wireless device to determine the first uplink transmission power based on a path loss between the wireless device and a base station.
27. The non-transitory computer-readable medium of claim 25 , wherein the second uplink transmission power is greater than the first uplink transmission power.
28. The non-transitory computer-readable medium of claim 25 , wherein the uplink transmission power threshold corresponds to a maximum transmission power of the wireless device.
29. The non-transitory computer-readable medium of claim 25 , wherein the uplink transmission power threshold corresponds to a configured maximum transmission power.
30. The non-transitory computer-readable medium of claim 25 , wherein the second uplink transmission power was adjusted based on a ramp up power value.
31. The non-transitory computer-readable medium of claim 25 , wherein the instructions, when executed, configure the wireless device to transmit the first message by transmitting an uplink transmission comprising the first message and another message at least partially overlapping with the first message.
32. The non-transitory computer-readable medium of claim 25 , wherein the second uplink transmission power comprises a total uplink transmission power.
33. The non-transitory computer-readable medium of claim 25 , wherein the determination that a response to the first message has not been received within the duration threshold comprises a determination that a response window, for reception of a random access response (RAR), has expired.
34. The non-transitory computer-readable medium of claim 25 , wherein the wireless device is configured for dual connectivity between New Radio (NR) and Evolved Universal Mobile Telecommunications Service Terrestrial Radio Access (E-UTRA), and wherein the instructions, when executed, configure the wireless device to transmit the first message by transmitting the first message via an NR resource.
35. The non-transitory computer-readable medium of claim 25 , wherein the instructions, when executed, configure the wireless device to receive, from a base station, at least one configuration parameter indicating the uplink transmission power threshold.
36. The non-transitory computer-readable medium of claim 25 , wherein the calculated uplink transmission power is adjusted from the first uplink transmission power and exceeds the uplink transmission power threshold.