Method for downlink communication by means of a downlink superimposed radio signal, a base station and a user terminal therefor

摘要

The invention concerns a method for downlink communication between a base station and a user terminal by means of a downlink superimposed radio signal comprising downlink data for the user terminal and for at least one further user terminal that are transmitted using the same radio resources, wherein the downlink data for the user terminal are transmitted with lower power than the downlink data for the at least one further user terminal, and control information is sent in downlink from the base station to the user terminal that enables the user terminal to decode the downlink data for the at least one further user terminal, a base station, a user terminal and a communication network therefor.

主权项

1. A method for downlink communication between a base station and a user terminal by a downlink superimposed radio signal comprising downlink data for the user terminal and for at least one further user terminal that are transmitted using the same radio resources, the method comprising:
transmitting the downlink data for the user terminal with lower power than the downlink data for the at least one further user terminal; sending control information in the downlink from the base station to the user terminal and enabling the user terminal to decode the downlink data for the at least one further user terminal; and repeatedly determining based on path losses and capabilities to schedule the decoding of downlink data from other user terminals, the user terminal, and the at least one further user terminal to which downlink data are transmitted on the same radio resources resulting in the superimposed radio signal, wherein the control information comprises information that enables the user terminal to successively reduce the superimposed radio signal by decoding the downlink data for the at least one further user terminal in the order of the downlink transmission power starting with the highest one, reconstructing a radio signal of the downlink data for the at least one further user terminal, and subtracting the radio signal of the downlink data for the at least one further user terminal from the superimposed radio signal, wherein the control information further comprises information that enables the user terminal to decode its own downlink data using the superimposed radio signal that has been reduced by the radio signal for the at least one further user terminal, wherein the control information for the user terminal and the at least one further user terminal are chain-like linked by a pointer in the control information for the user terminal pointing to the control information for another user terminal and indicate that data for two different user terminals is transmitted on the same physical resources, wherein the user terminal and the at least one further user terminal to which downlink data are transmitted on the same radio resources are determined for a time span of at least one subframe.