Non-orthogonal multiple access for machine type communications in a wireless communications network

摘要

A method of obtaining channel state information estimates in a network which supports communications with MIMO base stations and UEs and machine type communication MTC devices. The MTC devices, apply device-specific interleaving patterns to training signals, and apply a device-specific sparse mapping pattern to the training signals. Uplink transmissions are sent from the MTC device comprising the training signals and data signals. The UEs, send an uplink transmission comprising UE training signals and data signals. The MIMO base station receives an uplink transmission from the MTC and UE devices, using the device-specific interleaving pattern and mapping pattern of the MTC devices to distinguish the training signals of each MTC device from remaining MTC devices and from the training signals of each UE. The training signals are used to obtain CSI estimates. The method may be used in a non orthogonal multiple access communication network which supports a large number of MTC type devices MMTC.