Patent ID: 8792445
Filing Date: 2014-07-29
Classification: H04L

Abstract:
1. A method of downlink control signalling for downlink multiple input/multiple output (MIMO) operation between a Base Transceiver Station (BTS) and User Equipment (UE), the method including the steps of: maintaining one or more mapping tables at a network location accessible by the UE, the mapping tables including first UE signalling data; transmitting a message index to the UE to enable relevant first UE signalling data to be read by the UE; transmitting second UE signalling data to the UE; at the UE, using the first and second UE signalling data to derive UE control data; at the UE, using the transmitted message index and the second mapping table to determine the total number of transmission layers used by the BTS and the number of transmission layers assigned to one or more CDM groups of DM-RS ports; at the UE, using the total number of transmission layers used by the BTS, the number of transmission layers assigned to the one or more CDM groups of DM-RS ports and the third mapping table to derive the power ratio of the DM-RS to data symbols transmitted to the UE.