Selecting an uplink carrier of a cell based on a power-threshold and speed of a wireless device
A wireless device receives uplink configuration parameters indicating: a first uplink carrier of a cell; a second uplink carrier of the cell; and a power-threshold, based on the power threshold and a speed of the wireless device, one of the first uplink carrier and the second uplink carrier is selected as a selected uplink carrier. a random access preamble is transmitted via the selected uplink carrier.
1. A method comprising:
receiving, by a wireless device, uplink configuration parameters indicating:
a first uplink carrier of a cell;
a second uplink carrier of the cell; and
a power-threshold;
selecting, based on the power-threshold and a speed of the wireless device, one of the first uplink carrier and the second uplink carrier as a selected uplink carrier; and
transmitting a random access preamble via the selected uplink carrier.
2. The method of claim 1 , wherein the uplink configuration parameters further comprise a second scaling factor for the selecting the one of the first uplink carrier and the second uplink carrier.
3. The method of claim 2 , wherein the wireless device employs the second scaling factor based on a service type of the wireless device.
4. The method of claim 1 , wherein the first uplink carrier is a normal uplink carrier.
5. The method of claim 1 , wherein the second uplink carrier is a supplementary uplink carrier.
6. The method of claim 1 , wherein the first uplink carrier employs a higher frequency than the second uplink carrier.
7. The method of claim 1 , wherein the uplink configuration parameters further comprise at least one of:
first bandwidth information of the first uplink carrier; or
second bandwidth information of the second uplink carrier.
8. The method of claim 1 , wherein the cell is configured with at least one of:
a time division duplex; or
a frequency division duplex.
9. The method of claim 1 , wherein the first uplink carrier covers a smaller area than the second uplink carrier.
10. The method of claim 1 , wherein the wireless device is in a radio resource control idle state or in a radio resource control inactive state.
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 uplink configuration parameters indicating:
a first uplink carrier of a cell;
a second uplink carrier of the cell; and
a power-threshold;
select, based on the power-threshold and a speed of the wireless device, one of the first uplink carrier and the second uplink carrier as a selected uplink carrier; and
transmit a random access preamble via the selected uplink carrier.
12. The wireless device of claim 11 , wherein the uplink configuration parameters further comprise a second scaling factor for the selection of the one of the first uplink carrier and the second uplink carrier.
13. The wireless device of claim 12 , wherein the wireless device employs the second scaling factor based on a service type of the wireless device.
14. The wireless device of claim 11 , wherein the first uplink carrier is a normal uplink carrier.
15. The wireless device of claim 11 , wherein the second uplink carrier is a supplementary uplink carrier.
16. The wireless device of claim 11 , wherein the first uplink carrier employs a higher frequency than the second uplink carrier.
17. The wireless device of claim 11 , wherein the uplink configuration parameters further comprise at least one of:
first bandwidth information of the first uplink carrier; or
second bandwidth information of the second uplink carrier.
18. The wireless device of claim 11 , wherein the cell is configured with at least one of:
a time division duplex; or
a frequency division duplex.
19. The wireless device of claim 11 , wherein the first uplink carrier covers a smaller area than the second uplink carrier.
20. 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, cause the base station to transmit uplink configuration parameters indicating:
a first uplink carrier of a cell;
a second uplink carrier of the cell; and
a power-threshold; 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:
receive the uplink configuration parameters;
select, based on the power-threshold and a speed of the wireless device, one of the first uplink carrier and the second uplink carrier as a selected uplink carrier; and
transmit a random access preamble via the selected uplink carrier.