Random Access Procedures with Multiple Panels
A wireless device transmits a first preamble of a random access procedure via a first antenna panel. The wireless device may also receive a random access response corresponding to the first preamble and indicating a second antenna panel. The wireless device may further switch, based on the random access response, from the first antenna panel to the second antenna panel. The wireless device transmits, via the second antenna panel, an uplink transport block for the random access procedure.
1 . 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, via a first antenna panel, a first preamble of a random access procedure;
receive a random access response corresponding to the first preamble and indicating a second antenna panel;
switch, based on the random access response, from the first antenna panel to the second antenna panel; and
transmit, via the second antenna panel, an uplink transport block for the random access procedure.
2 . The wireless device of claim 1 , wherein the random access response comprises a field indicating the second antenna panel, and wherein the switching is based on the field indicating the second antenna panel.
3 . The wireless device of claim 2 , wherein the instructions further cause the wireless device to transmit, via the first antenna panel, a first preamble of a random access procedure, wherein the random access response corresponds to the first preamble.
4 . The wireless device of claim 1 , wherein the uplink transport block comprises a medium access control control element (MAC CE) indicating the second antenna panel.
5 . The wireless device of claim 1 , wherein the random access response further indicates a timing advance value.
6 . The wireless device of claim 5 , wherein the instructions further cause the wireless device to apply the timing advance value for the second antenna panel.
7 . The wireless device of claim 5 , wherein the transmitting the uplink transport block is based on the timing advance value.
8 . 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:
receive, via a first antenna panel, a first preamble of a random access procedure;
transmit a random access response corresponding to the first preamble and indicating a second antenna panel;
switch, for the wireless device and based on the random access response, from the first antenna panel to the second antenna panel; and
receive, from the wireless device and via the second antenna panel, an uplink transport block for the random access procedure.
9 . The base station of claim 8 , wherein the random access response comprises a field indicating the second antenna panel, and wherein the switching is based on the field indicating the second antenna panel.
10 . The base station of claim 9 , wherein the instructions further cause the base station to receive, from the wireless device and via the first antenna panel, a first preamble of a random access procedure, wherein the random access response corresponds to the first preamble.
11 . The base station of claim 8 , wherein the instructions further cause the base station to receive, via the second antenna panel, an uplink transport block for the random access procedure.
12 . The base station of claim 8 , wherein the uplink transport block comprises a medium access control control element (MAC CE) indicating the second antenna panel.
13 . The base station of claim 8 , wherein the random access response further indicates a timing advance value.
14 . The base station of claim 13 , wherein the wireless device is configured to apply the timing advance value for the second antenna panel and wherein the receiving the uplink transport block is based on the timing advance value.
15 . A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a wireless device, cause the wireless device to:
transmit, via a first antenna panel, a first preamble of a random access procedure;
receive a random access response corresponding to the first preamble and indicating a second antenna panel;
switch, based on the random access response, from the first antenna panel to the second antenna panel; and
transmit, via the second antenna panel, an uplink transport block for the random access procedure.
16 . The non-transitory computer-readable medium of claim 15 , wherein the random access response comprises a field indicating the second antenna panel, and wherein the switching is based on the field indicating the second antenna panel.
17 . The non-transitory computer-readable medium of claim 16 , wherein the instructions further cause the wireless device to transmit, via the first antenna panel, a first preamble of a random access procedure, wherein the random access response corresponds to the first preamble.
18 . The non-transitory computer-readable medium of claim 15 , wherein the uplink transport block comprises a medium access control control element (MAC CE) indicating the second antenna panel.
19 . The non-transitory computer-readable medium of claim 15 , wherein the random access response further indicates a timing advance value.
20 . The non-transitory computer-readable medium of claim 19 , wherein the instructions further cause the wireless device to apply the timing advance value for the second antenna panel and wherein the transmitting the uplink transport block is based on the timing advance value.