Configurable codebook for advanced csi feedback overhead reduction

Abstract

Network nodes, wireless devices and methods of reducing signaling overhead are provided. In one embodiment, a method includes transmitting to the wireless device at least one power threshold parameter to be used by the wireless device to determine a number of beams to be included in a multi-beam precoder codebook and transmitting to the wireless device a signal to interference plus noise ratio (SINR) to be used by the wireless device to determine to use one of a single beam precoder and a multiple beam precoder.

What is claimed is: 
     
         1 . method for a base station to determine a size of a channel state information (CSI) report produced by a user equipment, the method comprising:
 transmitting to the user equipment, configuration information with a first number of beams, N;   receiving signaling from the user equipment indicating at least one of:
 N power values, each power value corresponding to one of N beams; and 
 a second number of beams, M′, whose corresponding power value is above a predetermined power value, and 
   receiving the CSI report containing CSI pertaining to one or more beams whose corresponding power value is above the predetermined power value; and   determining the size of the CSI report produced by the user equipment.   
     
     
         2 . The method of  claim 1 , further comprising receiving the signaling in a first transmission including a medium access control, MAC, control element and receiving additional components of the CSI report in a second transmission on a physical uplink shared channel, PUSCH. 
     
     
         3 . The method of  claim 1 , further comprising receiving the signaling in a periodic report on a physical uplink control channel, PUCCH, and receiving additional components of the CSI report in a second transmission on a physical uplink shared channel, PUSCH. 
     
     
         4 . The method of  claim 1 , further comprising configuring the user equipment with a higher layer parameter to specify in which subframes the signaling from the user equipment is received. 
     
     
         5 . The method of  claim 1 , further comprising receiving the signaling in an aperiodic report on a physical uplink shared channel, PUSCH, and receiving additional components of the CSI report in a different report on the PUSCH. 
     
     
         6 . The method of  claim 1 , further comprising receiving the signaling on a physical uplink shared channel, PUSCH, that carries additional components of the CSI report. 
     
     
         7 . The method of  claim 1 , further comprising decoding the signaling followed by determining the size of the CSI report. 
     
     
         8 . The method of  claim 1 , wherein the first number of beams is signaled via radio resource control, RRC. 
     
     
         9 . A base station configured to determine a size of a channel state information (CSI) report produced by a user equipment, the base station comprising:
 a memory configured to store a predetermined power value;   a transceiver configured to:
 transmit to the user equipment configuration information with a first number of beams, N; 
 receive signaling from the user equipment indicating at least one of:
 N power values, each power value corresponding to one of N beams; and 
 a second number of beams, M′, whose corresponding power value is above the predetermined power value; and 
 
 receive the CSI report containing CSI pertaining to one or more beams whose corresponding power value is above the predetermined power value; and 
   a processing circuitry configured to determine the size of the CSI report produced by the user equipment.   
     
     
         10 . The base station of  claim 9 , wherein the transceiver is further configured to receive the signaling in a first transmission including a medium access control, MAC, control element and receiving additional components of the CSI report in a second transmission on a physical uplink shared channel, PUSCH. 
     
     
         11 . The base station of  claim 9 , wherein the transceiver is further configured to receive the signaling in a periodic report on a physical uplink control channel, PUCCH, and receiving additional components of the CSI report in a second transmission on a physical uplink shared channel, PUSCH. 
     
     
         12 . The base station of  claim 9 , wherein the processor is further configured to configure the user equipment with a higher layer parameter to specify in which subframes the signaling from the user equipment is received. 
     
     
         13 . The base station of  claim 9 , wherein the transceiver is further configured to receive the signaling in an aperiodic report on a physical uplink shared channel, PUSCH, and receiving additional components of the CSI report in a different report on the PUSCH. 
     
     
         14 . The base station of  claim 9 , wherein the transceiver is further configured to receive the signaling on a physical uplink shared channel, PUSCH, that carries additional components of the CSI report. 
     
     
         15 . The base station of  claim 9 , wherein the processor is further configured to decode the signaling followed by determining the size of the CSI report. 
     
     
         16 . The base station of  claim 9 , wherein the first number of beams is signaled via radio resource control, RRC. 
     
     
         17 . A user equipment operable to adjust uplink signaling overhead, the user equipment comprising:
 processing circuitry configured to:
 receive signaling that configures the user equipment with a first number of beams, N; 
 determine N power values, each power value corresponding to one of the N beams; and 
 include channel state information, CSI, in a CSI report, the CSI pertaining to one or more beams whose corresponding power value is above a predetermined power value. 
   
     
     
         18 . The user equipment of  claim 17 , wherein the processing circuitry is further configured to determine whether the number of beams, N, is equal to one or greater than one using a signal to interference plus noise ratio, SINR. 
     
     
         19 . The user equipment of  claim 17 , wherein the processing circuitry is further configured to:
 cause transmission of signaling by the user equipment indicating at least one of:
 N power values, each power value corresponding to one of the N beams, and 
 a second number of beams, M′, whose corresponding power value is above a predetermined value. 
   
     
     
         20 . The user equipment of  claim 17 , wherein the first number of beams is signaled via radio resource control, RRC.