Reception of split random access response
A wireless device transmit a first message comprising a first preamble and a first transport block. The first transport block comprises a contention resolution identifier of the wireless device. The wireless device receive a first random access response to the first message. The first random access response comprises the contention resolution identifier. The wireless device starts a first time window in response to receiving the first random access response. The wireless device monitor, during the first time window, a downlink channel for a second random access response to the first message. The wireless device determines a failure to receive the second random access response during the first time window. The wireless device transmits a second message comprising a second preamble in response to the failure.
1. A method comprising:
transmitting, by a wireless device, a first message comprising a first preamble and a first transport block comprising a contention resolution identifier of the wireless device;
receiving a first random access response to the first message, wherein the first random access response comprises the contention resolution identifier;
starting a first time window in response to receiving the first random access response;
monitoring, during the first time window, a downlink channel for a second random access response to the first message; and
transmitting a second message comprising a second preamble in response to determining a failure to receive the second random access response during the first time window.
2. The method of claim 1 , further comprising receiving configuration parameters indicating a duration of a first time window.
3. The method of claim 1 , wherein the first transport block comprises one of:
a radio resource connection setup request;
a radio resource connection resume request;
a radio resource connection establishment request; or
a radio resource connection re-establishment request.
4. The method of claim 1 , wherein the second random access response comprises one of:
a radio resource connection setup;
a radio resource connection resume;
a radio resource connection establishment; or
a radio resource connection re-establishment.
5. The method of claim 1 , further comprising:
starting a second time window in response to transmitting the first message; and
monitoring, during the second time window, the downlink channel for the first random access response; and
receiving, based on a random access radio network identifier, first downlink control information indicating a first downlink assignment of the first random access response.
6. The method of claim 1 , wherein the first random access response further comprises a cell radio network temporary identifier (C-RNTI) of the wireless device.
7. The method of claim 1 , further comprising receiving, during the first time window and based on the C-RNTI, second downlink control information indicating a second downlink assignment of the second random access response.
8. The method of claim 1 , wherein the second message is transmitted as a retransmission of the first message.
9. The method of claim 1 , wherein the second message further comprises a second transport block.
10. The method of claim 1 , further comprising:
receiving one or more downlink packets during the first time window; and
determining decoding failure of the second random access response using the one or more downlink packets.
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 comprising a first preamble and a first transport block comprising a contention resolution identifier of the wireless device;
receive a first random access response to the first message, wherein the first random access response comprises the contention resolution identifier;
start a first time window in response to receiving the first random access response;
monitor, during the first time window, a downlink channel for a second random access response to the first message; and
transmit a second message comprising a second preamble in response to determining a failure to receive the second random access response during the first time window.
12. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive configuration parameters indicating a duration of a first time window.
13. The wireless device of claim 11 , wherein the first transport block comprises one of:
a radio resource connection setup request;
a radio resource connection resume request;
a radio resource connection establishment request; or
a radio resource connection re-establishment request.
14. The wireless device of claim 11 , wherein the second random access response comprises one of:
a radio resource connection setup;
a radio resource connection resume;
a radio resource connection establishment; or
a radio resource connection re-establishment.
15. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:
start a second time window in response to transmitting the first message; and
monitor, during the second time window, the downlink channel for the first random access response; and
receive, based on a random access radio network identifier, first downlink control information indicating a first downlink assignment of the first random access response.
16. The wireless device of claim 11 , wherein the first random access response further comprises a cell radio network temporary identifier (C-RNTI) of the wireless device.
17. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive, during the first time window and based on the C-RNTI, second downlink control information indicating a second downlink assignment of the second random access response.
18. The wireless device of claim 11 , wherein the second message:
is transmitted as a retransmission of the first message; and
further comprises a second transport block.
19. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:
receive one or more downlink packets during the first time window; and
determine decoding failure of the second random access response using the one or more downlink packets.
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 comprising a first preamble and a first transport block comprising a contention resolution identifier of the wireless device;
receive a first random access response to the first message, wherein the first random access response comprises the contention resolution identifier;
start a first time window in response to receiving the first random access response;
monitor, during the first time window, a downlink channel for a second random access response to the first message; and
transmit a second message comprising a second preamble in response to determining a failure to receive the second random access response during the first time window.