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:
determining, by a wireless device, a first uplink transmission power for an uplink transmission comprising:
a first preamble for a two-step random access procedure; and
a first transport block;
based on a determination that the first uplink transmission power is less than or equal to an uplink transmission power threshold, transmitting, using the first uplink transmission power and via a first resource for the two-step random access procedure, a first message comprising the first preamble and the first transport block;
based on a determination that a response to the first message has not been received within a duration threshold, determining a second uplink transmission power for a second message associated with the uplink transmission; and
transmitting, via a second resource and using a third uplink transmission power that is less than the uplink transmission power threshold, the second message comprising a second preamble for a four-step random access procedure, wherein the transmitting the second message using the third uplink transmission power is based on a determination that the second uplink transmission power is greater than the uplink transmission power threshold.
2. The method of claim 1 , wherein the determining the first uplink transmission power comprises 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 determining the second uplink transmission power comprises determining the second uplink transmission power to be 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 determining the second uplink transmission power comprises:
determining the second uplink transmission power based on a ramp up power value.
6. The method of claim 1 , wherein the first uplink transmission power comprises a total uplink transmission power for the uplink transmission, and wherein the uplink transmission comprises the first message and another message at least partially overlapping with the first message.
7. The method of claim 1 , wherein the uplink transmission comprises the first message, and wherein the transmitting the first message comprises transmitting the uplink transmission using the first uplink transmission power.
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 third uplink transmission power comprises a total uplink transmission power.
10. The method of claim 1 , wherein the determination that a response to the first message has not been received within a duration threshold comprises a determination that a response window, for reception of a random access response (RAR), has expired.
11. The method of claim 1 , wherein the wireless device is configured for dual connectivity between New Radio (NR) and Evolved UMTS Terrestrial Radio Access (E-UTRA), and wherein the first resource comprises an NR resource.
12. The method of claim 1 , wherein the first message is scheduled to be transmitted at least partially overlapping in time with another transmission by the wireless device.
13. A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the wireless device to perform:
determining a first uplink transmission power for an uplink transmission comprising:
a first preamble for a two-step random access procedure; and
a first transport block;
based on a determination that the first uplink transmission power is less than or equal to an uplink transmission power threshold, transmitting, using the first uplink transmission power and via a first resource for the two-step random access procedure, a first message comprising the first preamble and the first transport block;
based on a determination that a response to the first message has not been received within a duration threshold, determining a second uplink transmission power for a second message associated with the uplink transmission; and
transmitting, via a second resource and using a third uplink transmission power that is less than the uplink transmission power threshold, the second message comprising a second preamble for a four-step random access procedure, wherein the transmitting the second message using the third uplink transmission power is based on a determination that the second uplink transmission power is greater than the uplink transmission power threshold.
14. The wireless device of claim 13 , wherein the instructions, when executed by the one or more processors, cause 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 instructions, when executed by the one or more processors, cause the wireless device to determine the second uplink transmission power to be 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 instructions, when executed by the one or more processors, cause the wireless device to determine the second uplink transmission power based on a ramp up power value.
18. The wireless device of claim 13 , wherein the first uplink transmission power comprises a total uplink transmission power for the uplink transmission, and wherein the uplink transmission comprises the first message and another message at least partially overlapping with the first message.
19. The wireless device of claim 13 , wherein the uplink transmission comprises the first message, and wherein the instructions, when executed by the one or more processors, cause the wireless device to transmit the first message by at least transmitting the uplink transmission using the first uplink transmission power.
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 third uplink transmission power comprises a total uplink transmission power.
22. 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.
23. The wireless device of claim 13 , wherein the instructions, when executed by the one or more processors, configure the wireless device for dual connectivity between New Radio (NR) and Evolved UMTS Terrestrial Radio Access (E-UTRA), and wherein the first resource comprises an NR resource.
24. The wireless device of claim 13 , wherein the first message is scheduled to be transmitted at least partially overlapping in time with another transmission by the wireless device.
25. A non-transitory computer-readable medium storing instructions that, when executed, cause:
determining a first uplink transmission power for an uplink transmission comprising:
a first preamble for a two-step random access procedure; and
a first transport block;
based on a determination that the first uplink transmission power is less than or equal to an uplink transmission power threshold, transmitting, using the first uplink transmission power and via a first resource for the two-step random access procedure, a first message comprising the first preamble and the first transport block;
based on a determination that a response to the first message has not been received within a duration threshold, determining a second uplink transmission power for a second message associated with the uplink transmission; and
transmitting, via a second resource and using a third uplink transmission power that is less than the uplink transmission power threshold, the second message comprising a second preamble for a four-step random access procedure, wherein the transmitting the second message using the third uplink transmission power is based on a determination that the second uplink transmission power is greater than the uplink transmission power threshold.
26. The non-transitory computer-readable medium of claim 25 , wherein the instructions, when executed, cause determining the first uplink transmission power based on a path loss between a wireless device and a base station.
27. The non-transitory computer-readable medium of claim 25 , wherein the instructions, when executed, cause determining the second uplink transmission power to be 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 a wireless device.
29. The non-transitory computer-readable medium of claim 25 , wherein the instructions, when executed, cause determining the second uplink transmission power based on a ramp up power value.
30. The non-transitory computer-readable medium of claim 25 , wherein the first uplink transmission power comprises a total uplink transmission power for the uplink transmission, and wherein the uplink transmission comprises the first message and another message at least partially overlapping with the first message.
31. The non-transitory computer-readable medium of claim 25 , wherein the uplink transmission comprises the first message, and wherein the instructions, when executed, cause the transmitting the first message to be performed by at least transmitting the uplink transmission using the first uplink transmission power.
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 third uplink transmission power comprises a total uplink transmission power.
34. 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.
35. The non-transitory computer-readable medium of claim 25 , wherein the instructions, when executed, configure a wireless device for dual connectivity between New Radio (NR) and Evolved UMTS Terrestrial Radio Access (E-UTRA), and wherein the first resource comprises an NR resource.
36. The non-transitory computer-readable medium of claim 25 , wherein the first message is scheduled to be transmitted by a wireless device at least partially overlapping in time with another transmission by the wireless device.
37. A system comprising:
a wireless device comprising:
one or more processors; and
memory storing instructions; and
a base station comprising:
one or more processors; and
memory storing instructions,
wherein the instructions stored in the memory of the wireless device, when executed by the one or more processors of the wireless device, cause the wireless device to perform:
determining a first uplink transmission power for an uplink transmission comprising:
a first preamble for a two-step random access procedure; and
a first transport block;
based on a determination that the first uplink transmission power is less than or equal to an uplink transmission power threshold, transmitting, using the first uplink transmission power and via a first resource for the two-step random access procedure, a first message comprising the first preamble and the first transport block;
based on a determination that a response to the first message has not been received within a duration threshold, determining a second uplink transmission power for a second message associated with the uplink transmission; and
transmitting, via a second resource and using a third uplink transmission power that is less than the uplink transmission power threshold, the second message comprising a second preamble for a four-step random access procedure, wherein the transmitting the second message using the third uplink transmission power is based on a determination that the second uplink transmission power is greater than the uplink transmission power threshold, and
wherein the instructions stored in the memory of the base station, when executed by the one or more processors of the base station, cause the base station to perform:
receiving, via the second resource, the second message.
38. The system of claim 37 , wherein the instructions stored in the memory of the wireless device, when executed by the one or more processors of the wireless device, cause the wireless device to determine the first uplink transmission power based on a path loss between the wireless device and the base station.
39. The system of claim 37 , wherein the instructions stored in the memory of the wireless device, when executed by the one or more processors of the wireless device, cause the wireless device to determine the second uplink transmission power to be greater than the first uplink transmission power.
40. The system of claim 37 , wherein the uplink transmission power threshold corresponds to a maximum transmission power of the wireless device.
41. The system of claim 37 , wherein the instructions stored in the memory of the wireless device, when executed by the one or more processors of the wireless device, cause the wireless device to determine the second uplink transmission power based on a ramp up power value.
42. The system of claim 37 , wherein the first uplink transmission power comprises a total uplink transmission power for the uplink transmission, and wherein the uplink transmission comprises the first message and another message at least partially overlapping with the first message.
43. The system of claim 37 , wherein the uplink transmission comprises the first message, and wherein the instructions stored in the memory of the wireless device, when executed by the one or more processors of the wireless device, cause the wireless device to transmit the first message by at least transmitting the uplink transmission using the first uplink transmission power.
44. The system of claim 37 , wherein the second uplink transmission power comprises a total uplink transmission power.
45. The system of claim 37 , wherein the third uplink transmission power comprises a total uplink transmission power.
46. The system of claim 37 , 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.
47. The system of claim 37 , wherein the instructions stored in the memory of the wireless device, when executed by the one or more processors of the wireless device, configure the wireless device for dual connectivity between New Radio (NR) and Evolved UMTS Terrestrial Radio Access (E-UTRA), and wherein the first resource comprises an NR resource.
48. The system of claim 37 , wherein the first message is scheduled to be transmitted at least partially overlapping in time with another transmission by the wireless device.
49. The system of claim 37 , wherein the instructions stored in the memory of the base station, when executed by the one or more processors of the base station, cause the base station to perform:
transmitting a downlink transmission comprising one or more configuration parameters associated with at least one of the first resource or the second resource.