NOMA (Non-Orthogonal Multiple Access) technology based cooperative multicast transmission method

Abstract

The invention discloses an NOMA technology based cooperative multicast transmission method. The method comprises the steps that S1) a base station constructs a unicast user candidate set; S2) the base station selects optimal unicast users d<n*> and multicast users from the user candidate set, and the selected users access the network at the same time; S3) the base station sends signals SBS(t) to all the multicast users and optimal unicast users d<n*>; S4) after receiving the SBS(t), the unicast users d<n*> decode multicast user signals S0(t), a step S5) is turned to if decoding succeeds, and otherwise, a step S6) is turned to; S5) the unicast users d<n*> remove the S0(t) from the SBS(t) via a successive interference cancellation technology, and then decode expected signals S1(t) and forward the multicast user signals, the multicast users receive the forwarded signals and merge the forwarded signals with signals received from the base station, and expected signals S0(t) are decoded; and S6) the unicast users d<n*> and the multicast users decode the signals SBS(t) to obtain the expected signals S1(t) and S0(t) of the themselves directly and respectively. Thus, the anti-interruption performance of multicast communication can be improved, transmission opportunities are provided for the unicast users, the spectral efficiency is improved, and the method can be applied to a multimedia multicast transmission system.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a cooperative multicast transmission method based on non-orthogonal multiple access technology. Background technique [0002] The development of wireless communication services and mobile terminal applications has brought about a blowout growth in data traffic, which has increased people's demand for spectrum resources. As a new type of wireless service, wireless multicast transmission utilizes the broadcast characteristics of wireless channels, and regards all users who have the same demand for specific resources during the transmission process as a multicast group, and delivers the same information to all multicast users at the same time. It is a wireless service with high spectrum efficiency and can be widely used in communication scenarios such as video on demand, video conferencing, and multimedia education. [0003] In wireless multicast transmission, due to the need ...

AI Technical Summary

Problems solved by technology

However, most of the nodes participating in the cooperation in the existing cooperative multicast technology are specially deployed relays or multicast users in the network, and the application flexibility is low. In addition, the common requirements of communication network users are not considered Individual data transmission requirements to differentiated users are not suitable for general networks where multicast users and unicast users coexist

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