Systems and methods for uplink transmission power control

Abstract

A user equipment (UE) for performing uplink transmission power control is described. The UE includes a processor and memory in electronic communication with the processor. The UE determines that dual connectivity is configured with more than one cell group. The UE also determines if a total transmission power of the cell groups exceeds a maximum allowed transmission power of the UE. The UE further determines if the cell groups are asynchronized and whether look-ahead with processing time reduction is supported by the UE. The UE additionally determines an available transmission power in a subframe of a given cell group. The UE also transmits uplink (UL) channels in a subframe based on the available transmission power of the given cell group.

What is claimed is: 
     
         1 . A user equipment (UE) for performing uplink transmission power control, comprising:
 a processor; and   memory in electronic communication with the processor, wherein instructions stored in the memory are executable to:
 determine that dual connectivity is configured with more than one cell group; 
 determine if a total transmission power of the cell groups exceeds a maximum allowed transmission power of the UE; 
 determine if the cell groups are asynchronized and whether look-ahead with processing time reduction is supported by the UE; 
 determine an available transmission power in a subframe of a given cell group; and 
 transmit uplink (UL) channels in a subframe based on the available transmission power of the given cell group. 
   
     
     
         2 . The UE of  claim 1 , wherein if the total transmission power of the cell groups exceeds the maximum allowed transmission power of the UE, the cell groups are asynchronized, and processing time reduction and look-ahead are not supported by the UE, then for a given subframe of a first cell group that overlaps with an earlier subframe and a later subframe of the other cell group, the instructions are further executable to:
 determine the transmission power allocated for the earlier subframe of the other cell group;   determine if a guaranteed power is configured for a cell group;   determine if there is a potential UL transmission in the later subframe of the other cell group;   determine the available transmission power in the given subframe of the first cell group; and   transmit uplink channels in the given subframe of the first cell group based on the available transmission power of the first cell group.   
     
     
         3 . The UE of  claim 2 , wherein if a guaranteed power is configured for the other cell group, and there is no potential UL transmission in the later subframe of the other cell group based on at least one of semi-static information and dynamic information, then the instructions are further executable to:
 determine the available transmission power in the given subframe of the first cell group as the maximum allowed transmission power of the UE reduced by the power allocated in the later subframe of the other cell group; and   transmit uplink channels in the given subframe of the first cell group by replacing the maximum allowed transmission power of the UE with the available transmission power of the first cell group.   
     
     
         4 . The UE of  claim 3 , wherein the instructions executable to determine that there is no potential UL transmission in the later subframe of the other cell group based on semi-static information comprise instructions executable to:
 determine that the later subframe of the other cell group has no uplink allocation based on time division duplexing (TDD) uplink/downlink (UL/DL) configurations of the serving cells.   
     
     
         5 . The UE of  claim 3 , wherein the instructions executable to determine that there is no potential UL transmission in the later subframe of the other cell group based on semi-static information comprise instructions executable to:
 determine that the later subframe of the other cell group has an uplink subframe allocation; and   determine that there is no semi-statically configured transmission in the later subframe of the other cell group, wherein the semi-statically configured transmission comprises at least one of periodic channel state information (CSI) and semi-persistent scheduling (SPS).   
     
     
         6 . The UE of  claim 3 , wherein the instructions executable to determine that there is no potential UL transmission in the later subframe of the other cell group based on semi-static information comprise instructions executable to:
 determine that the later subframe of the other cell group has an uplink subframe allocation; and   determine that there is no semi-statically configured physical random access channel (PRACH) or scheduling request (SR) resources in the later subframe of the other cell group.   
     
     
         7 . The UE of  claim 3 , wherein the instructions executable to determine that there is no potential UL transmission in the later subframe of the other cell group based on dynamic information comprise instructions executable to:
 determine that the cells in the other cell group include one or more enhanced interference mitigation and traffic adaptation (eIMTA) cells; and   determine that a valid UL/DL configuration is received in reconfiguration downlink control information (DCI) that configures the later subframe of the other cell group as a DL subframe.   
     
     
         8 . The UE of  claim 3 , wherein the instructions executable to determine that there is no potential UL transmission in the later subframe of the other cell group based on dynamic information comprise instructions executable to:
 determine that the later subframe of the other cell group has no downlink hybrid automatic repeat request (HARQ) association linkage or has a minimum downlink HARQ association linkage greater than 4 milliseconds;   determine that the later subframe of the other cell group has an uplink scheduling linkage greater than 4 milliseconds;   determine that there is no physical downlink shared channel (PDSCH) transmitted in any subframes included in a DL association set of the later subframe; and   determine that there is no physical uplink shared channel (PUSCH) scheduled in the later subframe.   
     
     
         9 . The UE of  claim 3 , wherein the instructions executable to determine that there is no potential UL transmission in the later subframe of the other cell group based on dynamic information comprise instructions executable to:
 determine that the cells in the other cell group include enhanced interference mitigation and traffic adaptation (eIMTA) cells;   determine that the later subframe of the other cell group has a minimum downlink HARQ association linkage of 4 milliseconds or an uplink scheduling linkage of 4 milliseconds;   determine that there is no PDSCH transmitted in any subframe earlier than the fourth subframe before the later subframe in the DL association set of the later subframe; and   determine that a valid UL/DL configuration is received in a reconfiguration DCI that configures the fourth subframe before the later subframe as a UL subframe.   
     
     
         10 . The UE of  claim 2 , wherein if a guaranteed power is configured for the other cell group, and there is a potential UL transmission in the later subframe of the other cell group based on at least one of semi-static information and dynamic information, then the instructions are further executable to:
 determine the available transmission power in the given subframe of the first cell group as the maximum allowed transmission power of the UE reduced by the maximum value of the power allocated in the later subframe of the other cell group or the guaranteed power of the other cell group; and   transmit uplink channels in the given subframe of the first cell group by replacing the maximum allowed transmission power of the UE with the available transmission power of the first cell group.   
     
     
         11 . The UE of  claim 10 , wherein the instructions executable to determine that there is a potential UL transmission in the later subframe of the other cell group based on semi-static information comprise instructions executable to:
 determine that there is a semi-statically configured transmission in the later subframe of the other cell group, wherein the semi-statically configured transmission comprises at least one of periodic channel state information (CSI) and semi-persistent scheduling (SPS).   
     
     
         12 . The UE of  claim 10 , wherein the instructions executable to determine that there is a potential UL transmission in the later subframe of the other cell group based on dynamic information comprise instructions executable to:
 determine that there is at least one PDSCH transmission in a DL subframe set of the later subframe of the other cell group.   
     
     
         13 . The UE of  claim 10 , wherein the instructions executable to determine that there is a potential UL transmission in the later subframe of the other cell group based on dynamic information comprise instructions executable to:
 determine that there is a PUSCH scheduled in the later subframe of the other cell group.   
     
     
         14 . The UE of  claim 10 , wherein the instructions executable to determine that there is a potential UL transmission in the later subframe of the other cell group based on dynamic information comprise instructions executable to:
 determine that the later subframe of the other cell group is an uplink subframe;   determine that the later subframe of the other cell group has a minimum downlink HARQ association linkage of 4 milliseconds or an uplink scheduling linkage of 4 milliseconds; and   determine that the later subframe of the other cell group is configured as a UL subframe and the fourth subframe before the later subframe is configured as a DL subframe if the cell is an eIMTA cell.   
     
     
         15 . The UE of  claim 2 , wherein if a guaranteed power is configured for the other cell group, and there is no potential physical random access channel (PRACH) and uplink control information (UCI) transmission in the later subframe of the other cell group based on at least one of semi-static information and dynamic information, then the instructions are further executable to:
 determine the available transmission power in the given subframe of the first cell group as the maximum allowed transmission power of the UE reduced by the power allocated in the later subframe of the other cell group; and   transmit uplink channels in the given subframe of the first cell group by replacing the maximum allowed transmission power of the UE with the available transmission power of the first cell group.   
     
     
         16 . An evolved node B (eNB) for performing uplink transmission power control, comprising:
 a processor; and   memory in electronic communication with the processor, wherein instructions stored in the memory are executable to:
 determine that dual connectivity is configured with more than one cell groups; 
 determine if a guaranteed power is configured for each cell group for a user equipment (UE); 
 determine if the cell groups are asynchronized and whether look-ahead with processing time reduction is supported by the UE; and 
 receive uplink channels in a subframe based on an available transmission power of a given cell group, wherein the receiving is based on different assumptions of the available transmission power. 
   
     
     
         17 . The eNB of  claim 16 , wherein if a total transmission power of the cell groups exceeds the maximum allowed transmission power of the UE, the cell groups are asynchronized, and processing time reduction and look-ahead are not supported by the UE, then for a given subframe of a first cell group that overlaps with an earlier subframe and a later subframe of the other cell group, the instructions are further executable to:
 receive uplink channels in the given subframe of the first cell group based on an available transmission power of the first cell group, wherein the available transmission power of the first cell group is determined based on whether there is a potential UL transmission in the later subframe of the other cell group.   
     
     
         18 . The eNB of  claim 17 , wherein if a guaranteed power is configured for the other cell group, and there is no potential UL transmission in the later subframe of the other cell group based on at least one of semi-static information and dynamic information, then the instructions are further executable to:
 receive the uplink channels in the given subframe of the first cell group based on the available transmission power of the first cell group, wherein the available transmission power in the given subframe of the first cell group is determined as the maximum allowed transmission power of the UE reduced by the power allocated in the later subframe of the other cell group.   
     
     
         19 . The eNB of  claim 17 , wherein if a guaranteed power is configured for the other cell group, and there is a potential UL transmission in the later subframe of the other cell group based on at least one of semi-static information and dynamic information, then the instructions are further executable to:
 receive the uplink channels in the given subframe of the first cell group based on the available transmission power of the first cell group, wherein the available transmission power in the given subframe of the first cell group is determined as the maximum allowed transmission power of the UE reduced by the maximum value of the power allocated in the later subframe of the other cell group or the guaranteed power of the other cell group.   
     
     
         20 . The eNB of  claim 17 , wherein if a guaranteed power is configured for the other cell group, and there is no potential physical random access channel (PRACH) and uplink control information (UCI) transmission in the later subframe of the other cell group based on at least one of semi-static information and dynamic information, then the instructions are further executable to:
 receive uplink channels in the given subframe of the first cell group based on the available transmission power of the first cell group, wherein the available transmission power in the given subframe of the first cell group is determined as the maximum allowed transmission power of the UE reduced by the power allocated in the later subframe of the other cell group.   
     
     
         21 . A method for performing uplink transmission power control by a user equipment (UE), comprising:
 determining that dual connectivity is configured with more than one cell group;   determining if a total transmission power of the cell groups exceeds a maximum allowed transmission power of the UE;   determining if the cell groups are asynchronized and whether look-ahead with processing time reduction is supported by the UE;   determining an available transmission power in a subframe of a given cell group; and   transmitting uplink (UL) channels in a subframe based on the available transmission power of the given cell group.   
     
     
         22 . The method of  claim 21 , wherein if the total transmission power of the cell groups exceeds the maximum allowed transmission power of the UE, the cell groups are asynchronized, and processing time reduction and look-ahead are not supported by the UE, then for a given subframe of a first cell group that overlaps with an earlier subframe and a later subframe of the other cell group, the method further comprises:
 determining the transmission power allocated for the earlier subframe of the other cell group;   determining if a guaranteed power is configured for a cell group;   determining if there is a potential UL transmission in the later subframe of the other cell group;   determining the available transmission power in the given subframe of the first cell group; and   transmitting uplink channels in the given subframe of the first cell group based on the available transmission power of the first cell group.   
     
     
         23 . The method of  claim 22 , wherein if a guaranteed power is configured for the other cell group, and there is no potential UL transmission in the later subframe of the other cell group based on at least one of semi-static information and dynamic information, then the method further comprises:
 determining the available transmission power in the given subframe of the first cell group as the maximum allowed transmission power of the UE reduced by the power allocated in the later subframe of the other cell group; and   transmitting uplink channels in the given subframe of the first cell group by replacing the maximum allowed transmission power of the UE with the available transmission power of the first cell group.   
     
     
         24 . The method of  claim 22 , wherein if a guaranteed power is configured for the other cell group, and there is a potential UL transmission in the later subframe of the other cell group based on at least one of semi-static information and dynamic information, then the method further comprises:
 determining the available transmission power in the given subframe of the first cell group as the maximum allowed transmission power of the UE reduced by the maximum value of the power allocated in the later subframe of the other cell group or the guaranteed power of the other cell group; and   transmitting uplink channels in the given subframe of the first cell group by replacing the maximum allowed transmission power of the UE with the available transmission power of the first cell group.   
     
     
         25 . The method of  claim 22 , wherein if a guaranteed power is configured for the other cell group, and there is no potential physical random access channel (PRACH) and uplink control information (UCI) transmission in the later subframe of the other cell group based on at least one of semi-static information and dynamic information, then the method further comprises:
 determining the available transmission power in the given subframe of the first cell group as the maximum allowed transmission power of the UE reduced by the power allocated in the later subframe of the other cell group; and   transmitting uplink channels in the given subframe of the first cell group by replacing the maximum allowed transmission power of the UE with the available transmission power of the first cell group.   
     
     
         26 . A method for performing uplink transmission power control by an evolved node B (eNB), comprising:
 determining that dual connectivity is configured with more than one cell groups; and   determining if a guaranteed power is configured for each cell group for a user equipment (UE);   determining if the cell groups are asynchronized and whether look-ahead with processing time reduction is supported by the UE; and   receiving uplink channels in a subframe based on an available transmission power of a given cell group, wherein the receiving is based on different assumptions of the available transmission power.   
     
     
         27 . The method of  claim 26 , wherein if a total transmission power of the cell groups exceeds the maximum allowed transmission power of the UE, the cell groups are asynchronized, and processing time reduction and look-ahead are not supported by the UE, then for a given subframe of a first cell group that overlaps with an earlier subframe and a later subframe of the other cell group, the method further comprises:
 receiving uplink channels in the given subframe of the first cell group based on an available transmission power of the first cell group, wherein the available transmission power of the first cell group is determined based on whether there is a potential UL transmission in the later subframe of the other cell group.   
     
     
         28 . The method of  claim 27 , wherein if a guaranteed power is configured for the other cell group, and there is no potential UL transmission in the later subframe of the other cell group based on at least one of semi-static information and dynamic information, then the method further comprises:
 receiving the uplink channels in the given subframe of the first cell group based on the available transmission power of the first cell group, wherein the available transmission power in the given subframe of the first cell group is determined as the maximum allowed transmission power of the UE reduced by the power allocated in the later subframe of the other cell group.   
     
     
         29 . The method of  claim 27 , wherein if a guaranteed power is configured for the other cell group, and there is a potential UL transmission in the later subframe of the other cell group based on at least one of semi-static information and dynamic information, then the method further comprises:
 receiving the uplink channels in the given subframe of the first cell group based on the available transmission power of the first cell group, wherein the available transmission power in the given subframe of the first cell group is determined as the maximum allowed transmission power of the UE reduced by the maximum value of the power allocated in the later subframe of the other cell group or the guaranteed power of the other cell group.   
     
     
         30 . The method of  claim 27 , wherein if a guaranteed power is configured for the other cell group, and there is no potential physical random access channel (PRACH) and uplink control information (UCI) transmission in the later subframe of the other cell group based on at least one of semi-static information and dynamic information, then the method further comprises:
 receiving uplink channels in the given subframe of the first cell group based on the available transmission power of the first cell group, wherein the available transmission power in the given subframe of the first cell group is determined as the maximum allowed transmission power of the UE reduced by the power allocated in the later subframe of the other cell group.