Random access response reception for a two-step random access procedure
A wireless device may transmit a first message, for a random access procedure, including a contention resolution identifier of the wireless device. The wireless device may receive, via a first slot indicated by downlink control information (DCI), a first response of the first message. The first response may include the contention resolution identifier and indicate a slot offset and a start symbol. The wireless device may receive a second response of the first message from the start symbol of a second slot, wherein the second slot is based on a time offset and the slot offset with respect to the first slot.
1. A method comprising:
transmitting, by a wireless device, a first message, for a random access procedure, comprising a contention resolution identifier of the wireless device;
receiving, via a first slot indicated by downlink control information (DCI), a first response of the first message, wherein the first response comprises the contention resolution identifier and indicates:
a slot offset; and
a start symbol; and
receiving a second response of the first message from the start symbol of a second slot, wherein the second slot is based on a time offset and the slot offset with respect to the first slot.
2. The method of claim 1 , wherein the slot offset is indicated in an allocation table.
3. The method of claim 1 , further comprising determining the start symbol based on a start symbol number indicated in an allocation table.
4. The method of claim 1 , wherein the slot offset starts with respect to the first slot.
5. The method of claim 1 , further comprising determining the first slot based on:
a first slot offset; and
a first start symbol number.
6. The method of claim 5 , wherein the DCI indicates one or both of the first slot offset and the first start symbol number in an allocation table.
7. The method of claim 1 , wherein the random access procedure comprises a two-step random access procedure.
8. The method of claim 1 , wherein the time offset is defined based on one or both of:
one or more symbols; and
one or more slots.
9. The method of claim 1 , wherein the time offset is predefined or semi-statically configured.
10. The method of claim 1 , further comprising determining, based on a first numerology used for receiving the first response, at least one of one or more values as the time offset, the at least one of the one or more values being associated with the first numerology.
11. 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 a first message, for a random access procedure, comprising a contention resolution identifier of the wireless device;
receive, via a first slot indicated by downlink control information (DCI), a first response of the first message, wherein the first response comprises the contention resolution identifier and indicates:
a slot offset; and
a start symbol; and
receive a second response of the first message from the start symbol of a second slot, wherein the second slot is based on a time offset and the slot offset with respect to the first slot.
12. The wireless device of claim 11 , wherein the slot offset is indicated in an allocation table.
13. The wireless device of claim 11 , wherein the instructions further cause the wireless device to determine the start symbol based on a start symbol number indicated in an allocation table.
14. The wireless device of claim 11 , wherein the slot offset starts with respect to the first slot.
15. The wireless device of claim 11 , wherein the instructions further cause the wireless device to determine the first slot based on:
a first slot offset; and
a first start symbol number.
16. The wireless device of claim 15 , wherein the DCI indicates one or both of the first slot offset and the first start symbol number in an allocation table.
17. The wireless device of claim 11 , wherein the random access procedure comprises a two-step random access procedure.
18. The wireless device of claim 11 , wherein the time offset is defined based on one or both of:
one or more symbols; and
one or more slots.
19. The wireless device of claim 11 , wherein the time offset is predefined or semi-statically configured.
20. A system comprising:
a base station; and
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, to the base station, a first message, for a random access procedure, comprising a contention resolution identifier of the wireless device;
receive, from the base station via a first slot indicated by downlink control information (DCI), a first response of the first message, wherein the first response comprises the contention resolution identifier and indicates:
a slot offset; and
a start symbol; and
receive, from the base station, a second response of the first message from the start symbol of a second slot, wherein the second slot is based on a time offset and the slot offset with respect to the first slot.