Systems and methods for fast uplink power control

1. A method performed by a wireless device for fast uplink power control, the method comprising:

receiving a transmit power control command from a network node;

determining one of two or more predefined transmit power control mapping tables to be used by the wireless device to interpret the transmit power control command;

determining a power adjustment value based on the transmit power control command received from the network node using the one of the two or more predefined transmit power control mapping tables; and

adjusting a transmit power of the wireless device based on the power adjustment value;

wherein:

the two or more predefined transmit power control mapping tables comprise a first transmit power control mapping table and a second transmit power control mapping table that is different than the first transmit power control mapping table; and

the first transmit power control mapping table is an existing table defined in Third Generation Partnership Project, 3GPP, Long Term Evolution, LTE, and the second transmit power control mapping table is a new table.

2. The method of claim 1 further comprising transmitting an uplink transmission using the adjusted transmit power.

3. The method of claim 1 further comprising:

receiving, from the network node, an indication of the one of the two or more predefined transmit power control mapping tables to be used by the wireless device;

wherein determining the one of the two or more predefined transmit power control mapping tables to be used by the wireless device comprises determining the one of the two or more predefined transmit power control mapping tables to be used by the wireless device based on the indication received from the network node.

4. The method of claim 1 wherein determining the one of the two or more predefined transmit power control mapping tables to be used by the wireless device comprises determining, at the wireless device, the one of the two or more predefined transmit power control mapping tables to be used by the wireless device based on one or more predefined criteria.

5. The method of claim 4 wherein the one or more predefined criteria comprise a criterion related to a height of the wireless device.

6. The method of claim 4 wherein the one or more predefined criteria comprise a criterion based on:

a Reference Signal Received Power, RSRP, of a serving cell of the wireless device and a RSRP of one or more neighboring cells of the wireless device; and/or

Reference Signal Received Quality, RSRQ; and/or

Received Signal Strength Indicator, RSSI.

7. The method of claim 1 further comprising:

receiving one or more criteria from the network node;

wherein determining the one of the two or more predefined transmit power control mapping tables to be used by the wireless device comprises determining the one of the two or more predefined transmit power control mapping tables to be used by the wireless device based on the one or more criteria received from the network node.

8. The method of claim 1 , wherein the first transmit power control mapping table and the second transmit power control mapping table have a same number of entries.

9. The method of claim 8 wherein:

the first transmit power control mapping table has four entries corresponding to four different power adjustment values defined by the first transmit power control mapping table; and

the second transmit power control mapping table has four entries corresponding to four different power adjustment values defined by the second transmit power control mapping table, at least one of which is greater than all of the four different power adjustment values defined by the first transmit power control mapping table.

10. The method of claim 8 wherein:

the first transmit power control mapping table has four entries corresponding to four different power adjustment values defined by the first transmit power control mapping table; and

the second transmit power control mapping table has four entries corresponding to four different power adjustment values defined by the second transmit power control mapping table, at least one of which is less than all of the four different power adjustment values defined by the first transmit power control mapping table.

11. The method of claim 1 , wherein the first transmit power control mapping table has a first number of entries and the second transmit power control mapping table has a second number of entries that is not equal to the first number of entries.

12. The method of claim 11 wherein:

the first transmit power control mapping table has four entries corresponding to four different power adjustment values defined by the first transmit power control mapping table; and

the second transmit power control mapping table has eight entries corresponding to eight different power adjustment values defined by the second transmit power control mapping table, at least one of which is greater than all of the four different power adjustment values defined by the first transmit power control mapping table.

13. The method of claim 11 wherein:

the first transmit power control mapping table has four entries corresponding to four different power adjustment values defined by the first transmit power control mapping table; and

the second transmit power control mapping table has eight entries corresponding to eight different power adjustment values defined by the second transmit power control mapping table, at least one of which is less than all of the four different power adjustment values defined by the first transmit power control mapping table.

14. The method of claim 11 wherein the first transmit power control mapping table is a subset of the second transmit power control mapping table.

15. The method of claim 1 wherein the two or more predefined transmit power control mapping tables define accumulated power adjustment values.

16. The method of claim 1 wherein the two or more predefined transmit power control mapping tables define non-accumulated power adjustment values.

17. The method of claim 1 wherein receiving the transmit power control command from the network node comprises receiving, from the network node, downlink control information comprising the transmit power control command.

18. The method of claim 17 wherein a pathloss compensation factor is jointly indicated with the power adjustment value using the same field in the downlink control information.

19. The method of claim 1 , further comprising:

providing user data; and

forwarding the user data to a host computer via a transmission to the network node using the adjusted transmit power.

20. A wireless device for fast uplink power control, the wireless device comprising:

an interface; and

processing circuitry configured to cause the wireless device to:

receive a transmit power control command from a network node;

determine one of two or more predefined transmit power control mapping tables to be used by the wireless device to interpret the transmit power control command;

determine a power adjustment value based on the transmit power control command received from the network node using the one of the two or more predefined transmit power control mapping tables; and

adjust a transmit power of the wireless device based on the power adjustment value;

wherein:

the two or more predefined transmit power control mapping tables comprise a first transmit power control mapping table and a second transmit power control mapping table that is different than the first transmit power control mapping table; and

the first transmit power control mapping table is an existing table defined in Third Generation Partnership Project, 3GPP, Long Term Evolution, LTE, and the second transmit power control mapping table is a new table.

21. A method performed by a network node to provide fast uplink power control, the method comprising:

signaling, from the network node to a wireless device:

an indication of one of two or more predefined transmit power control mapping tables to be used by the wireless device; or

one or more criteria to be used by the wireless device to select the one of the two or more predefined mapping tables to be used by the wireless device; and

sending, from the network node to the wireless device, a transmit power control command to be mapped to a power adjustment value by the wireless device using the one of the two or more predefined transmit power control mapping tables;

wherein:

the two or more predefined transmit power control mapping tables comprise a first transmit power control mapping table and a second transmit power control mapping table that is different than the first transmit power control mapping table; and

the first transmit power control mapping table is an existing table defined in Third Generation Partnership Project, 3GPP, Long Term Evolution, LTE, and the second transmit power control mapping table is a new table.

22. The method of claim 21 wherein signaling the indication of the one of the two or more predefined transmit power control mapping tables to be used by the wireless device or the one or more criteria to be used by the wireless device to select the one of the two or more predefined mapping tables to be used by the wireless device comprises:

signaling, from the network node to the wireless device, the indication of the one of the two or more predefined transmit power control mapping tables to be used by the wireless device.

23. The method of claim 21 wherein signaling the indication of the one of the two or more predefined transmit power control mapping tables to be used by the wireless device or the one or more criteria to be used by the wireless device to select the one of the two or more predefined mapping tables to be used by the wireless device comprises:

signaling, from the network node to the wireless device, the one or more criteria to be used by the wireless device to select the one of the two or more predefined transmit power control mapping tables.

24. The method of claim 21 , wherein the first transmit power control mapping table and the second transmit power control mapping table have a same number of entries.

25. The method of claim 24 wherein:

the first transmit power control mapping table has four entries corresponding to four different power adjustment values defined by the first transmit power control mapping table; and

the second transmit power control mapping table has four entries corresponding to four different power adjustment values defined by the second transmit power control mapping table, at least one of which is greater than all of the four different power adjustment values defined by the first transmit power control mapping table.

26. The method of claim 24 wherein:

the first transmit power control mapping table has four entries corresponding to four different power adjustment values defined by the first transmit power control mapping table; and

the second transmit power control mapping table has four entries corresponding to four different power adjustment values defined by the second transmit power control mapping table, at least one of which is less than all of the four different power adjustment values defined by the first transmit power control mapping table.

27. The method of claim 21 , wherein the first transmit power control mapping table has a first number of entries and the second transmit power control mapping table has a second number of entries that is not equal to the first number of entries.

28. The method of claim 27 wherein:

the first transmit power control mapping table has four entries corresponding to four different power adjustment values defined by the first transmit power control mapping table; and

the second transmit power control mapping table has eight entries corresponding to eight different power adjustment values defined by the second transmit power control mapping table, at least one of which is greater than all of the four different power adjustment values defined by the first transmit power control mapping table.

29. The method of claim 27 wherein:

the first transmit power control mapping table has four entries corresponding to four different power adjustment values defined by the first transmit power control mapping table; and

the second transmit power control mapping table has eight entries corresponding to eight different power adjustment values defined by the second transmit power control mapping table, at least one of which is less than all of the four different power adjustment values defined by the first transmit power control mapping table.

30. The method of claim 27 wherein the first transmit power control mapping table is a subset of the second transmit power control mapping table.

31. The method of claim 21 wherein the two or more predefined transmit power control mapping tables define accumulated power adjustment values.

32. The method of claim 21 wherein the two or more predefined transmit power control mapping tables define non-accumulated power adjustment values.

33. The method of claim 21 wherein sending the transmit power control command comprises sending, from the network node to the wireless device, downlink control information comprising the transmit power control command.

34. The method of claim 33 wherein a pathloss compensation factor is jointly indicated with the power adjustment value using the same field in the downlink control information.

35. The method of claim 21 , further comprising:

obtaining user data; and

forwarding the user data to a host computer or a wireless device.

36. A network node for fast uplink power control, the network node comprising:

an interface; and

processing circuitry configured to cause the network node to:

signal, from the network node to a wireless device:

an indication of one of two or more predefined transmit power control mapping tables to be used by the wireless device; or

one or more criteria to be used by the wireless device to select the one of the two or more predefined mapping tables to be used by the wireless device; and

send, from the network node to the wireless device, a transmit power control command to be mapped to a power adjustment value by the wireless device using the one of the two or more predefined transmit power control mapping tables;

wherein:

the two or more predefined transmit power control mapping tables comprise a first transmit power control mapping table and a second transmit power control mapping table that is different than the first transmit power control mapping table; and

the first transmit power control mapping table is an existing table defined in Third Generation Partnership Project, 3GPP, Long Term Evolution, LTE, and the second transmit power control mapping table is a new table.