Method and a system for csi reporting in lte networks according to the mobility of the user equipment

A method for channel state information (CSI) reporting in LTE-Advanced networks, comprising a user equipment (UE) transmitting to a LTE cellular base station (eNodeB) a CSI report containing quality information including CQI, PMI and RI indicators, on an uplink radio channel in a periodic manner using a physical uplink shared channel (PUSCH), wherein the method comprises said CSI reporting being activated based on a low mobility estimation of said UE, said low mobility estimation being performed by said eNodeB, and in that said CSI reporting comprises:

• a first CSI report type containing detailed CSI information in the form of discrete wavelet transform or DWT of the channel impulse responses as well as average CQI indications for the codewords in use, being some of the DWT coefficients admissible to be discarded for increased compression;
• and
• a second CSI report type containing differences in coefficients of said DWT for each of said channel impulse responses, and differences in the average of said CQI values.

A system for channel state information (CSI) reporting in LTE-Advanced networks, comprising a user equipment (UE) being configured to transmit to a LTE cellular base station (eNodeB) a CSI report containing quality information including CQI, PMI and RI indicators on an uplink radio channel in a periodic manner using a physical uplink shared channel (PUSCH), wherein the system said eNodeB is configured to estimate a low-mobility of said UE and to activate said CSI reporting based on said estimated low-mobility, said CSI reporting comprising:

• a first CSI report type containing detailed CSI information in the form of discrete wavelet transform or DWT of the channel impulse responses as well as average CQI indications for the codewords in use, being some of the DWT coefficients admissible to be discarded for increased compression;
• and
• a second CSI report type containing differences in coefficients of said DWT for each of said channel impulse responses, and differences in the average of said CQI values.