Patent ID: 8649793
Filing Date: 2014-02-11
Classification: H04B,H04L,H04W

Abstract:
1. A method in a radio network node for adapting transmission power of reference elements which comprise resource elements for demodulation reference signals, wherein the radio network node is configured for multiple-input multiple-output (MIMO) transmission to a user equipment, wherein said MIMO transmission comprises at least three layers, each layer being allocated to a resource block of said MIMO transmission, wherein the resource block comprises subcarriers, wherein two consecutive subcarriers of the resource block carry a number of reference elements equal to a number of said at least three layers, wherein a first subcarrier of the resource block carries data elements for said at least three layers, the first subcarrier being different from said two consecutive subcarriers, wherein the method comprises: adapting transmission power of said number of reference elements such that an average transmission power, over said two consecutive subcarriers, of said number of reference elements is equal to a transmission power, for the first subcarrier, of the data elements for said at least three layers, and using the adapted transmission power to transmit, to the user equipment, said number of reference elements.