METHOD AND APPARATUS FOR DATA TRANSMISSION IN A MULTIUSER DOWNLINK CELLULAR SYSTEM

摘要

A data transmission and signaling method in a transmitter device configured for concurrent transmission of non-orthogonal independent downlink data streams to receiver devices in a wireless communication system comprises sending to all receiver devices control information that includes indices of receiver devices selected for transmission, code rates of selected receiver devices, a label bit-to-receiver device allocation, an index of an expanded constellation, and a number of resource elements used for transmission.

主权项

1. A transmitter device, comprising:
a processor configured to:
determine a downlink channel quality of downlink channels between the transmitter device and a plurality of receiver devices;compute a scheduler weight for each of the plurality of receiver devices;for each modulation of a set of modulations, determine weighted bit-level capacities of all label bits based on the scheduler weights and based on the downlink channel qualities;determine, for each modulation of the set of modulations, a highest weighted sum rate based on the weighted bit-level capacities;select a modulation from the set of modulations according to a maximum weighted sum rate among the highest weighted sum rates, select a set of receiver devices from the plurality of receiver devices according to the selected modulation, and select a label bit-to-UE allocation for receiver devices in the selected set of receiver devices according to the selected modulation;obtain a multiplexing matrix using the selected label bit-to-user equipment (bit-to-UE) allocation and the number of resource elements, which are for transmitting a downlink signal S;compute a code rate using the selected label bit-to-UE allocation and the determined bit-level capacity for each receiver device in the selected set; andtransmit, using the resource elements, the downlink signal S based on the obtained multiplexing matrix and computed code rates, to the receiver devices in the selected set.