RSBA-Resource Sharing Beamforming Access for 5G-mMTC

Providing connectivity in massive Machine Type Communications (mMTC) poses interesting challenges. In this paper, we propose and study a time diversity beamformer for reception in grant-free access in order to support massive uplink connectivity within the paradigm of the Internet of Things (IoT). The proposed access technique does not require channel estimation or prior network scheduling and provides benefits in terms of Probability of Collision and/or achievable Rate. The combination of our frame structure proposal with spatial signal processing at the receiver side yields a reduction on the probability of collision between devices, which, ultimately, implies that more users can access to the media.