Random access procedures using repetition
Wireless communications may be used for repetition of one or more transmissions. At least some wireless devices may use and/or require different quantities of repetitions of one or more transmissions based on one or more factors such as received signal strength and/or other channel condition(s). The quantity of repetitions may be less than or equal to a maximum quantity of repetitions that may be indicated by a base station.
1 . A method comprising:
receiving, by a wireless device, an indication of an allowable quantity of repetitions for a physical uplink shared channel (PUSCH) transmission comprising at least one transport block, wherein the PUSCH transmission is associated with a random access preamble of a random access procedure; and
sending repetitions of the PUSCH transmission, wherein a quantity of the repetitions is determined based on a received signal strength of a downlink reference signal and is less than or equal to the allowable quantity of repetitions.
2 . The method of claim 1 , further comprising:
receiving, in response to the PUSCH transmission, a random access response that indicates at least one of:
a success of the random access procedure;
a failure of the random access procedure;
a fallback from a two-step random access procedure to a four-step random access procedure; or
an uplink grant.
3 . The method of claim 1 , wherein the allowable quantity of repetitions is a maximum quantity of allowed repetitions.
4 . The method of claim 1 , further comprising:
determining a physical random access channel (PRACH) occasion associated with the downlink reference signal; and
transmitting, via the PRACH occasion, the random access preamble.
5 . The method of claim 1 , further comprising:
receiving configuration parameters of a plurality of PUSCH resources for the random access preamble, wherein the sending the quantity of repetitions of the PUSCH transmission comprises sending the quantity of repetitions of the PUSCH transmission via at least one PUSCH resource of the plurality of PUSCH resources.
6 . The method of claim 5 , wherein each of the at least one PUSCH resource comprises:
at least one frequency resource;
at least one time resource; and
at least one demodulation reference signal (DM-RS) resource.
7 . The method of claim 5 , further comprising:
based on not receiving at least one random access response within a time period, transmitting the PUSCH transmission via at least one second PUSCH resource of the plurality of PUSCH resources.
8 . A method comprising:
sending, by a base station, an indication of an allowable quantity of repetitions for a physical uplink shared channel (PUSCH) transmission comprising at least one transport block, wherein the PUSCH transmission is associated with a random access preamble of a random access procedure; and
receiving, by the base station, repetitions of the PUSCH transmission, wherein a quantity of the repetitions is determined based on a received signal strength of a downlink reference signal and is less than or equal to the allowable quantity of repetitions.
9 . The method of claim 8 , further comprising:
sending, in response to the PUSCH transmission, a random access response that indicates at least one of:
a success of the random access procedure;
a failure of the random access procedure;
a fallback from a two-step random access procedure to a four-step random access procedure; or
an uplink grant.
10 . The method of claim 8 , wherein the allowable quantity of repetitions is a maximum quantity of allowed repetitions.
11 . The method of claim 9 , further comprising:
receiving, via a physical random access channel (PRACH) occasion associated with the downlink reference signal, the random access preamble.
12 . The method of claim 8 , further comprising:
sending configuration parameters of a plurality of PUSCH resources for the random access preamble, wherein the receiving the quantity of repetitions of the PUSCH transmission comprises receiving the quantity of repetitions of the PUSCH transmission via at least one PUSCH resource of the plurality of PUSCH resources.
13 . The method of claim 12 , wherein each of the at least one PUSCH resource comprises:
at least one frequency resource;
at least one time resource; and
at least one demodulation reference signal (DM-RS) resource.
14 . The method of claim 12 , further comprising:
based on not sending at least one random access response within a time period, receiving the PUSCH transmission via at least one second PUSCH resource of the plurality of PUSCH resources.
15 . 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:
receive an indication of an allowable quantity of repetitions for a physical uplink shared channel (PUSCH) transmission comprising at least one transport block, wherein the PUSCH transmission is associated with a random access preamble of a random access procedure; and
send repetitions of the PUSCH transmission, wherein a quantity of the repetitions is determined based on a received signal strength of a downlink reference signal and is less than or equal to the allowable quantity of repetitions.
16 . The wireless device of claim 15 , wherein the instructions, when executed by the one or more processors, cause the wireless device to receive, in response to the PUSCH transmission, a random access response that indicates at least one of:
a success of the random access procedure;
a failure of the random access procedure;
a fallback from a two-step random access procedure to a four-step random access procedure; or
an uplink grant.
17 . The wireless device of claim 15 , wherein the allowable quantity of repetitions is a maximum quantity of allowed repetitions.
18 . The wireless device of claim 15 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:
determine a physical random access channel (PRACH) occasion associated with the downlink reference signal; and
transmit, via the PRACH occasion, the random access preamble.
19 . The wireless device of claim 15 , wherein the instructions, when executed by the one or more processors, cause the wireless device to receive configuration parameters of a plurality of PUSCH resources for the random access preamble, the sending the quantity of repetitions of the PUSCH transmission comprises sending the quantity of repetitions of the PUSCH transmission via at least one PUSCH resource of the plurality of PUSCH resources.
20 . The wireless device of claim 19 , wherein each of the at least one PUSCH resource comprises:
at least one frequency resource;
at least one time resource; and
at least one demodulation reference signal (DM-RS) resource.
21 . The wireless device of claim 19 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:
based on not receiving at least one random access response within a time period, transmit the PUSCH transmission via at least one second PUSCH resource of the plurality of PUSCH resources.
22 . A base station comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the base station to:
send an indication of an allowable quantity of repetitions for a physical uplink shared channel (PUSCH) transmission comprising at least one transport block, wherein the PUSCH transmission is associated with a random access preamble of a random access procedure; and
receive repetitions of the PUSCH transmission, wherein a quantity of the repetitions is determined based on a received signal strength of a downlink reference signal and is less than or equal to the allowable quantity of repetitions.
23 . The base station of claim 22 , wherein the instructions, when executed by the one or more processors, cause the base station to:
send, in response to the PUSCH transmission, a random access response that indicates at least one of:
a success of the random access procedure;
a failure of the random access procedure;
a fallback from a two-step random access procedure to a four-step random access procedure; or
an uplink grant.
24 . The base station of claim 22 , wherein the allowable quantity of repetitions is a maximum quantity of allowed repetitions.
25 . The base station of claim 22 , wherein the instructions, when executed by the one or more processors, cause the base station to receive, via a physical random access channel (PRACH) occasion associated with the downlink reference signal, the random access preamble.
26 . The base station of claim 22 , wherein the instructions, when executed by the one or more processors, cause the base station to send configuration parameters of a plurality of PUSCH resources for the random access preamble, wherein the receiving the quantity of repetitions of the PUSCH transmission comprises receiving the quantity of repetitions of the PUSCH transmission via at least one PUSCH resource of the plurality of PUSCH resources.
27 . The base station of claim 26 , wherein each of the at least one PUSCH resource comprises:
at least one frequency resource;
at least one time resource; and
at least one demodulation reference signal (DM-RS) resource.
28 . The base station of claim 26 , wherein the instructions, when executed by the one or more processors, cause the base station to:
based on not sending at least one random access response within a time period, receiving the PUSCH transmission via at least one second PUSCH resource of the plurality of PUSCH resources.