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 transmission power, a first message comprising a first preamble and comprising a transport block;
based on a determination that a calculated transmission power associated with transmission of a second message does not satisfy a transmission power threshold, transmitting, using a second transmission power, the second message, wherein the second message comprises a second preamble, and wherein the second transmission power was adjusted from the calculated transmission power to satisfy the transmission power threshold; and
based on receiving a random access response to the second message, retransmitting the transport block.
2 . The method of claim 1 , further comprising determining the first transmission power based on a path loss between the wireless device and a base station.
3 . The method of claim 1 , wherein the second transmission power is greater than the first transmission power.
4 . The method of claim 1 , wherein the transmission power threshold corresponds to a maximum transmission power of the wireless device.
5 . The method of claim 1 , wherein the transmission power threshold corresponds to a configured maximum transmission power.
6 . The method of claim 1 , wherein the second transmission power was adjusted based on a ramp up power value.
7 . The method of claim 1 , wherein the second transmission power comprises a total transmission power.
8 . The method of claim 1 , further comprising receiving, from a base station, at least one configuration parameter indicating the transmission power threshold.
9 . The method of claim 1 , wherein the calculated transmission power is adjusted from the first transmission power and exceeds the transmission power threshold.
10 . The method of claim 1 , wherein the first preamble is associated with a two-step random access procedure and the second preamble is associated with a four-step random access procedure.
11 . The method of claim 1 , wherein the transmitting the second message using the second transmission power is further based on a determination that a response to the first message has not been received within a duration threshold.
12 . 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:
transmit, using a first transmission power, a first message comprising a first preamble and comprising a transport block;
based on a determination that a calculated transmission power associated with transmission of a second message does not satisfy a transmission power threshold, transmit, using a second transmission power, the second message, wherein the second message comprises a second preamble, and wherein the second transmission power was adjusted from the calculated transmission power to satisfy the transmission power threshold; and
based on receiving a random access response to the second message, retransmit the transport block.
13 . The wireless device of claim 12 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to determine the first transmission power based on a path loss between the wireless device and a base station.
14 . The wireless device of claim 12 , wherein the second transmission power is greater than the first transmission power.
15 . The wireless device of claim 12 , wherein the transmission power threshold corresponds to a maximum transmission power of the wireless device.
16 . The wireless device of claim 12 , wherein the transmission power threshold corresponds to a configured maximum transmission power.
17 . The wireless device of claim 12 , wherein the second transmission power was adjusted based on a ramp up power value.
18 . The wireless device of claim 12 , wherein the second transmission power comprises a total transmission power.
19 . The wireless device of claim 12 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive, from a base station, at least one configuration parameter indicating the transmission power threshold.
20 . The wireless device of claim 12 , wherein the calculated transmission power is adjusted from the first transmission power and exceeds the transmission power threshold.
21 . The wireless device of claim 12 , wherein the first preamble is associated with a two-step random access procedure and the second preamble is associated with a four-step random access procedure.
22 . The wireless device of claim 12 , wherein the instructions, when executed by the one or more processors, cause the wireless device to transmit the second message using the second transmission power further based on a determination that a response to the first message has not been received within a duration threshold.
23 . A non-transitory computer-readable medium storing instructions that, when executed, configure a wireless device to:
transmit, using a first transmission power, a first message comprising a first preamble and comprising a transport block;
based on a determination that a calculated transmission power associated with transmission of a second message does not satisfy a transmission power threshold, transmit, using a second transmission power, the second message, wherein the second message comprises a second preamble, and wherein the second transmission power was adjusted from the calculated transmission power to satisfy the transmission power threshold; and
based on receiving a random access response to the second message, retransmit the transport block.
24 . The non-transitory computer-readable medium of claim 23 , wherein the instructions, when executed, further configure the wireless device to determine the first transmission power based on a path loss between the wireless device and a base station.
25 . The non-transitory computer-readable medium of claim 23 , wherein the second transmission power is greater than the first transmission power.
26 . The non-transitory computer-readable medium of claim 23 , wherein the transmission power threshold corresponds to a maximum transmission power of the wireless device.
27 . The non-transitory computer-readable medium of claim 23 , wherein the transmission power threshold corresponds to a configured maximum transmission power.
28 . The non-transitory computer-readable medium of claim 23 , wherein the second transmission power was adjusted based on a ramp up power value.
29 . The non-transitory computer-readable medium of claim 23 , wherein the second transmission power comprises a total transmission power.
30 . The non-transitory computer-readable medium of claim 23 , wherein the instructions, when executed, further configure the wireless device to receive, from a base station, at least one configuration parameter indicating the transmission power threshold.
31 . The non-transitory computer-readable medium of claim 23 , wherein the calculated transmission power is adjusted from the first transmission power and exceeds the transmission power threshold.
32 . The non-transitory computer-readable medium of claim 23 , wherein the first preamble is associated with a two-step random access procedure and the second preamble is associated with a four-step random access procedure.
33 . The non-transitory computer-readable medium of claim 23 , wherein the instructions, when executed, configure the wireless device to transmit the second message using the second transmission power further based on a determination that a response to the first message has not been received within a duration threshold.