Patent ID: 8588206
Filing Date: 2013-11-19
Classification: H04L

Abstract:
1. A method of assigning reference signals to antennas and nodes in a wireless communication system, the wireless communication system comprising: N number of transmitting nodes, wherein N is an integer and N≧1, said transmitting nodes transmitting reference signals in a first slot and a second slot within sub-frames over the same bandwidth, wherein each transmitting node has at least one transmit antenna, wherein different nodes can have different number of transmit antennas, and wherein said reference signals comprise two different types, the two different types including a first type of reference signals used for demodulation, and a second type of reference signals used for measurements; wherein the method comprises: assigning reference signals of said first type to a number of transmitting nodes with at least one transmit antenna in said first and second slot in a predefined bandwidth; and assigning reference signals of said second type to at least one transmitting node with at least two transmit antennas in at least one of said first and second slot in a predefined bandwidth; wherein: reference signals of said second type corresponding to at least one first nodes are assigned to said first slot, reference signals of said second type corresponding to at least one second node are assigned to said second slot, and the reference signals of said second type corresponding to at least one transmit antenna, for at least one third node, are assigned to said first slot, and wherein said reference signals of said second type corresponding to the rest of said transmit antennas, for said at least one third node, are assigned to said second slot.