Power Control for Retransmissions
Systems, apparatuses, and methods are described for wireless communications. Wireless communications between a base station and one or more wireless devices are described. A wireless device may use power ramping for transmissions and/or retransmissions. Power ramping may be used during a random access procedure. A wireless device may fail a channel access procedure (e.g., a listen before talk procedure) before sending a preamble or a transport block on an unlicensed band. The wireless device may use power ramping to determine a power of transmission of the preamble and/or transport block based on the prior preamble or a transport block transmission. Power ramping may be determined using a power ramping counter value and/or a power ramping step value, which may be shared or associated with the preamble and/or a transport block.
1 . A method comprising:
transmitting, by a wireless device, a first preamble of a message, wherein channel access procedures indicate:
an idle channel for transmission of the first preamble; and
a busy channel for transmission of a transport block of the message;
based on an expiration of a time duration for reception of a response associated with the message:
transmitting a second preamble using a first ramped transmission power; and
transmitting the transport block using a second ramped transmission power.
2 . The method of claim 1 , further comprising:
adjusting, based on the transmitting the first preamble, a power ramping counter; and
determining, based on the adjusted power ramping counter, the first ramped transmission power and the second ramped transmission power.
3 . The method of claim 1 , further comprising receiving configuration parameters that indicate:
a first random access channel for transmission of the first preamble, and
a first uplink channel for transmission of the transport block.
4 . The method of claim 1 , further comprising:
determining, based on the expiration of the time duration, that a contention resolution was unsuccessfully completed, wherein the transmitting the second preamble and the transmitting the transport block are further based on the unsuccessful completion of contention resolution.
5 . The method of claim 1 , further comprising:
determining, based on a transmission power of the transmitting the first preamble:
the first ramped transmission power, and
the second ramped transmission power.
6 . The method of claim 1 , wherein:
the message is associated with random access, and
the response associated with the message is a random access response.
7 . The method of claim 1 , wherein the expiration of the time duration comprises an expiration of a random access response window.
8 . 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 a first preamble of a message, wherein channel access procedures indicate:
an idle channel for transmission of the first preamble; and
a busy channel for transmission of a transport block of the message; and
based on an expiration of a time duration for reception of a response associated with the message:
transmit a second preamble using a first ramped transmission power; and
transmit the transport block using a second ramped transmission power.
9 . The wireless device of claim 8 , wherein the instructions, when executed by the one or more processors, configure the wireless device to:
adjust, based on the transmitting the first preamble, a power ramping counter; and
determine, based on the adjusted power ramping counter, the first ramped transmission power and the second ramped transmission power.
10 . The wireless device of claim 8 , wherein the instructions, when executed by the one or more processors, configure the wireless device to receive configuration parameters that indicate:
a first random access channel for transmission of the first preamble, and
a first uplink channel for transmission of the transport block.
11 . The wireless device of claim 8 , wherein the instructions, when executed by the one or more processors, configure the wireless device to:
determine, based on the expiration of the time duration, that a contention resolution was unsuccessfully completed; and
and transmit the second preamble and the transport block based on the unsuccessful completion of contention resolution.
12 . The wireless device of claim 8 , wherein the instructions, when executed by the one or more processors, configure the wireless device to:
determine, based on a transmission power of the transmitting the first preamble:
the first ramped transmission power, and
the second ramped transmission power.
13 . The wireless device of claim 8 , wherein:
the message is associated with random access, and
the response associated with the message is a random access response.
14 . The wireless device of claim 8 , wherein the expiration of the time duration comprises an expiration of a random access response window.
15 . A system comprising:
a wireless device and a base station,
wherein the wireless device is configured to:
transmit a first preamble of a message, wherein channel access procedures indicate:
an idle channel for transmission of the first preamble; and
a busy channel for transmission of a transport block of the message; and
based on an expiration of a time duration for reception of a response associated with the message:
transmit a second preamble using a first ramped transmission power; and
transmit the transport block using a second ramped transmission power, and
wherein the base station is configured to receive the second preamble and the transport block.
16 . The system of claim 15 , wherein the wireless device is configured to:
adjust, based on the transmitting the first preamble, a power ramping counter; and
determine, based on the adjusted power ramping counter, the first ramped transmission power and the second ramped transmission power.
17 . The system of claim 15 , wherein the wireless device is configured to receive configuration parameters that indicate:
a first random access channel for transmission of the first preamble, and
a first uplink channel for transmission of the transport block.
18 . The system of claim 15 , wherein the wireless device is configured to:
determine, based on the expiration of the time duration, that a contention resolution was unsuccessfully completed; and
and transmit the second preamble and the transport block based on the unsuccessful completion of contention resolution.
19 . The system of claim 15 , wherein the wireless device is configured to determine, based on a transmission power of the transmitting the first preamble:
the first ramped transmission power, and
the second ramped transmission power.
20 . The system of claim 15 , wherein:
the message is associated with random access, and
the response associated with the message is a random access response.
21 . The system of claim 15 , wherein the expiration of the time duration comprises an expiration of a random access response window.
22 . One or more non-transitory, computer-readable media storing instructions that, when executed, configure a wireless device to:
transmit a first preamble of a message, wherein channel access procedures indicate:
an idle channel for transmission of the first preamble; and
a busy channel for transmission of a transport block of the message; and
based on an expiration of a time duration for reception of a response associated with the message:
transmit a second preamble using a first ramped transmission power; and
transmit the transport block using a second ramped transmission power.
23 . The one or more non-transitory, computer-readable media of claim 22 ,
wherein the instructions, when executed, configure the wireless device to:
adjust, based on the transmitting the first preamble, a power ramping counter; and
determine, based on the adjusted power ramping counter, the first ramped transmission power and the second ramped transmission power.
24 . The one or more non-transitory, computer-readable media of claim 22 , wherein the instructions, when executed, configure the wireless device to receive configuration parameters that indicate:
a first random access channel for transmission of the first preamble, and
a first uplink channel for transmission of the transport block.
25 . The one or more non-transitory, computer-readable media of claim 22 , wherein the instructions, when executed, configure the wireless device to:
determine, based on the expiration of the time duration, that a contention resolution was unsuccessfully completed; and
and transmit the second preamble and the transport block based on the unsuccessful completion of contention resolution.
26 . The one or more non-transitory, computer-readable media of claim 22 , wherein the instructions, when executed, configure the wireless device to:
determine, based on a transmission power of the transmitting the first preamble:
the first ramped transmission power, and
the second ramped transmission power.
27 . The one or more non-transitory, computer-readable media of claim 22 , wherein:
the message is associated with random access, and
the response associated with the message is a random access response.
28 . The one or more non-transitory, computer-readable media of claim 22 , wherein the expiration of the time duration comprises an expiration of a random access response window.