Patent ID: 9077495
Filing Date: 2015-07-07
Classification: H04B,H04L,H04W

Abstract:
1. A method for transmitting a demodulation reference signal over a backhaul link in a Long Term Evolution-Advanced, LTE-A, system, comprising: selecting, by an eNodeB in a resource zone occupied by a Relay-Physical Downlink Shared Channel, R-PDSCH, over the backhaul link, preconfigured resource units for transmission of a demodulation reference signal of the R-PDSCH; and transmitting, by the eNodeB, the demodulation reference signal to a Relay Node, RN, subordinated to the eNodeB in the selected resource units, wherein configuring the resource units for transmission of the demodulation reference signal of the R-PDSCH comprises: determining the resource zone occupied by the R-PDSCH; selecting resource units in the resource zone, which are neither occupied by a common reference signal nor located at a last OFDM symbol of the resource zone; and configuring the selected resource units as the resource units for transmission of the demodulation reference signal of the R-PDSCH; wherein in a case that a Code Division Multiplexing-Time, CDM-T, mode is adopted for the demodulation reference signal and a number of OFDM symbols covered by a resource zone occupied by a Relay-Physical Downlink Control Channel, R-PDCCH, over the backhaul link is less than or equal to 2, and wherein the selecting the resource units in the resource zone, which are neither occupied by the common reference signal nor located at the last OFDM symbol of the resource zone comprises: or wherein in a case that a Code Division Multiplexing-Time, CDM-T, mode is adopted for the demodulation reference signal and a number of OFDM symbols covered by a resource zone occupied by a Relay-Physical Downlink Control Channel, R-PDCCH, over the backhaul link is larger than 2, and wherein the selecting the resource units in the resource zone, which are neither occupied by the common reference signal nor located at the last OFDM symbol of the resource zone comprises: