Activation of semi-persistent channel state information in a wireless device
A wireless device receives one or more radio resource control messages. The one or more radio resource control messages comprise configuration parameters of semi-persistent channel state information (CSI) reports for transmission via a physical uplink shared channel (PUSCH) of a first cell in a timing advance group. A downlink control information (DCI) indicating activation of semi-persistent CSI is received via PUSCH resources of the PUSCH of the first cell. In response to a time alignment timer of the timing advance group expiring, first PUSCH resources of the PUSCH resources are cleared. The first PUSCH resources occur after the time alignment timer expires.
1. A method comprising:
receiving, by a wireless device, one or more radio resource control (RRC) messages comprising configuration parameters of semi-persistent channel state information (CSI) reports for transmission via a physical uplink shared channel (PUSCH) of a first cell in a timing advance group;
receiving a downlink control information (DCI) indicating activation of semi-persistent CSI via PUSCH resources of the PUSCH of the first cell; and
in response to a time alignment timer associated with the timing advance group expiring, clearing first PUSCH resources of the PUSCH resources and maintaining RRC configuration parameters of the semi-persistent CSI reports, wherein the first PUSCH resources occur after the time alignment timer expires.
2. The method of claim 1 , further comprising transmitting a first semi-persistent CSI report, of the semi-persistent CSI reports, via second PUSCH resources of the PUSCH resources wherein the second PUSCH resources occur before the time alignment timer expires.
3. The method of claim 2 , wherein the second PUSCH resources are available for uplink scheduling by a base station in response to the clearing of the second PUSCH resources.
4. The method of claim 1 , wherein the one or more radio resource control messages further comprise:
first configuration parameters of one or more cells grouped into the timing advance group; and
second configuration parameters of the time alignment timer for the timing advance group.
5. The method of claim 1 , wherein the PUSCH resources of the first cell are determined based on:
the DCI; and
the configuration parameters of the semi-persistent CSI reports.
6. The method of claim 1 , wherein the one or more radio resource control messages are one or more radio resource control messages comprising the configuration parameters of the semi-persistent CSI reports.
7. The method of claim 1 , further comprising:
receiving a second DCI indicating activation of second PUSCH resources, wherein the second PUSCH resources are determined based on:
the second DCI; and
the configuration parameters of the semi-persistent CSI reports; and
transmitting a second semi-persistent CSI report, of the semi-persistent CSI reports, via resources of the second PUSCH resources.
8. The method of claim 1 , further comprising starting the time alignment timer in response to receiving a timing advance control element.
9. The method of claim 1 , wherein the timing advance group is a primary timing advance group comprising a primary cell and one or more secondary cells.
10. The method of claim 1 , wherein the timing advance group is a secondary timing advance group comprising one or more secondary cells.
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:
receive one or more radio resource control (RRC) messages comprising configuration parameters of semi-persistent channel state information (CSI) reports for transmission via a physical uplink shared channel (PUSCH) of a first cell in a timing advance group;
receive a downlink control information (DCI) indicating activation of semi-persistent CSI via PUSCH resources of the PUSCH of the first cell; and
in response to a time alignment timer associated with the timing advance group expiring, clear first PUSCH resources of the PUSCH resources and maintain RRC configuration parameters of the semi-persistent CSI reports, wherein the first PUSCH resources occur after the time alignment timer expires.
12. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to transmit a first semi-persistent CSI report, of the semi-persistent CSI reports, via second PUSCH resources of the PUSCH resources wherein the second PUSCH resources occur before the time alignment timer expires.
13. The wireless device of claim 12 , wherein the second PUSCH resources are available for uplink scheduling by a base station in response to the clearing of the second PUSCH resources.
14. The wireless device of claim 11 , wherein the one or more radio resource control messages further comprise:
first configuration parameters of one or more cells grouped into the timing advance group; and
second configuration parameters of the time alignment timer for the timing advance group.
15. The wireless device of claim 11 , wherein the PUSCH resources of the first cell are determined based on:
the DCI; and
the configuration parameters of the semi-persistent CSI reports.
16. The wireless device of claim 11 , wherein the one or more radio resource control messages are one or more radio resource control messages comprising the configuration parameters of the semi-persistent CSI reports.
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 a second DCI indicating activation of second PUSCH resources, wherein the second PUSCH resources are determined based on:
the second DCI; and
the configuration parameters of the semi-persistent CSI reports; and
transmit a second semi-persistent CSI report, of the semi-persistent CSI reports, via resources of the second PUSCH resources.
18. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to start the time alignment timer in response to receiving a timing advance control element.
19. The wireless device of claim 11 , wherein the timing advance group is a primary timing advance group comprising a primary cell and one or more secondary cells.
20. The 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:
receive, from the base station, one or more radio resource control (RRC) messages comprising configuration parameters of semi-persistent channel state information (CSI) reports for transmission via a physical uplink shared channel (PUSCH) of a first cell in a timing advance group;
receive a downlink control information (DCI) indicating activation of semi-persistent CSI via PUSCH resources of the PUSCH of the first cell; and
in response to a time alignment timer associated with the timing advance group expiring, clear first PUSCH resources of the PUSCH resources and maintain RRC configuration parameters of the semi-persistent CSI reports, wherein the first PUSCH resources occur after the time alignment timer expires.