Random access resource configuration based on downlink control information

1. A method comprising:

selecting, by a wireless device, a first downlink reference signal from one or more downlink reference signals based on a received signal strength of the first downlink reference signal being above a value;

determining, based on an index of the first downlink reference signal, a radio network identifier;

receiving a downlink control information (DCI) addressed to the radio network identifier and indicating one or more random access occasions (ROs);

transmitting, in response to receiving the DCI, a preamble via one of the one or more ROs;

wherein the DCI further indicates a first time offset to a first RO of the one or more ROs, and wherein the one or more ROs:

comprise consecutive ROs multiplexed in at least one of a frequency domain or a time domain; and

are ordered in an increasing order of frequency resource indexes followed by increasing order of time resource indexes, wherein the ordering starts from the first RO;

determining the first RO by applying the first time offset to an end of a reception of the DCI;

determining at least one RO from the one or more ROs, wherein the at least one RO is associated with the first downlink reference signal; and

selecting a second RO from the at least one RO, wherein the one of the one or more ROs is the second RO;

wherein the determining the at least one RO comprises:

mapping the one or more ROs to the one or more downlink reference signals based on:

an increasing order of indexes of the one or more ROs;

an increasing order of indexes of the one or more downlink reference signals; and

a number of ROs based on a downlink reference signal to RO mapping ratio; and

determining the number of ROs from the one or more ROs that are mapped to the first downlink reference signal.

2. The method of claim 1 , wherein the determining is based on the index indicating a time resource in which the first downlink reference signal is received.

3. The method of claim 1 , wherein the index comprises a first index of a first slot associated with a reception of the first downlink reference signal.

4. The method of claim 1 , further comprising:

receiving, from a base station, one or more messages indicating one or more monitoring occasions for the DCI.

5. The method of claim 4 , wherein:

the one or more monitoring occasions are associated with at least one downlink reference signal from the one or more downlink reference signals;

the at least one downlink reference signal comprises the first downlink reference signal; and

a demodulation reference signal antenna port associated with a reception of the DCI is quasi co-located with the first downlink reference signal.

6. The method of claim 4 , further comprising monitoring, during a time duration indicated by a monitoring window value, the one or more monitoring occasions for the DCI addressed to the radio network identifier, wherein the time duration starts at a first monitoring occasion, of the one or more monitoring occasions, from an end of a reception of the first downlink reference signal.

7. The method of claim 6 , further comprising determining to start the monitoring based on a second time offset with respect to the end of the reception of the first downlink reference signal, wherein the second time offset:

comprises at least one of:

one or more slots; or

one or more symbols; and

is:

indicated via the one or more messages; or

predefined.

8. 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:

select a first downlink reference signal from one or more downlink reference signals based on a received signal strength of the first downlink reference signal being above a value;

determine, based on an index of the first downlink reference signal, a radio network identifier;

receive a downlink control information (DCI) addressed to the radio network identifier and indicating one or more random access occasions (ROs);

transmit, in response to receiving the DCI, a preamble via one of the one or more ROs;

wherein the DCI further indicates a first time offset to a first RO of the one or more ROs, and wherein the one or more ROs:

comprise consecutive ROs multiplexed in at least one of a frequency domain or a time domain; and

are ordered in an increasing order of frequency resource indexes followed by increasing order of time resource indexes, wherein the ordering starts from the first RO;

determine the first RO by applying the first time offset to an end of a reception of the DCI;

determine at least one RO from the one or more ROs, wherein the at least one RO is associated with the first downlink reference signal; and

select a second RO from the at least one RO, wherein the one of the one or more ROs is the second RO;

wherein to determine the at least one RO, the instructions cause the wireless device to:

map the one or more ROs to the one or more downlink reference signals based on:

an increasing order of indexes of the one or more ROs;

an increasing order of indexes of the one or more downlink reference signals; and

a number of ROs based on a downlink reference signal to RO mapping ratio; and

determine the number of ROs from the one or more ROs that are mapped to the first downlink reference signal.

9. The wireless device of claim 8 , wherein the radio network identifier is determined based on the index indicating a time resource in which the first downlink reference signal is received.

10. The wireless device of claim 8 , wherein the index comprises a first index of a first slot associated with a reception of the first downlink reference signal.

11. The wireless device of claim 8 , wherein the instructions further cause the wireless device to:

receive, from a base station, one or more messages indicating one or more monitoring occasions for the DCI.

12. The wireless device of claim 11 , wherein the instructions further cause the wireless device to monitor, during a time duration indicated by a monitoring window value, the one or more monitoring occasions for the DCI addressed to the radio network identifier, wherein the time duration starts at a first monitoring occasion, of the one or more monitoring occasions, from an end of a reception of the first downlink reference signal.

13. The wireless device of claim 12 , wherein the instructions further cause the wireless device to determine to start the monitoring based on a second time offset with respect to the end of the reception of the first downlink reference signal, wherein the second time offset:

comprises at least one of:

one or more slots; or

one or more symbols; and

is:

indicated via the one or more messages; or

predefined.

14. A system comprising:

a base station comprising:

one or more first processors; and

first memory storing first instructions that, when executed by the one or more first processors of the base station, cause the base station to:

transmit one or more downlink reference signals;

transmit a downlink control information (DCI) addressed to a radio network identifier and indicating one or more random access occasions (ROs); and

receive, in response to receiving the DCI, a preamble via one of the one or more ROs; and

a wireless device comprising:

one or more second processors; and

second memory storing second instructions that, when executed by the one or more second processors, cause the wireless device to:

select a first downlink reference signal from the one or more downlink reference signals based on a received signal strength of the first downlink reference signal being above a value;

determine, based on an index of the first downlink reference signal, the radio network identifier;

receive the DCI addressed to the radio network identifier and indicating the one or more ROs;

transmit, in response to receiving the DCI, the preamble via the one of the one or more ROs;

wherein the DCI further indicates a first time offset to a first RO of the one or more ROs, and wherein the one or more ROs:

comprise consecutive ROs multiplexed in at least one of a frequency domain or a time domain; and

are ordered in an increasing order of frequency resource indexes followed by increasing order of time resource indexes, wherein the ordering starts from the first RO;

determine the first RO by applying the first time offset to an end of a reception of the DCI;

determine at least one RO from the one or more ROs, wherein the at least one RO is associated with the first downlink reference signal; and

select a second RO from the at least one RO, wherein the one of the one or more ROs is the second RO;

wherein to determine the at least one RO, the second instructions cause the wireless device to:

map the one or more ROs to the one or more downlink reference signals based on:

an increasing order of indexes of the one or more ROs;

an increasing order of indexes of the one or more downlink reference signals; and

a number of ROs based on a downlink reference signal to RO mapping ratio; and

determine the number of ROs from the one or more ROs that are mapped to the first downlink reference signal.