Compressive Random Access Using A Common Overloaded Control Channel

TL;DR

This paper proposes a novel 'one shot' random access method using a common overloaded control channel, enabling efficient user detection and data demodulation without prior synchronization, supported by theoretical analysis and LTE-A simulations.

Contribution

It introduces a new random access procedure that jointly detects user activity and channel profiles using compressive sensing, with explicit rate expressions and practical LTE-A simulations.

Findings

Achieves sparse random access of 100 users in 1ms

Provides explicit rate and scaling laws for the system

Validates approach with LTE-A-like simulations

Abstract

We introduce a "one shot" random access procedure where users can send a message without a priori synchronizing with the network. In this procedure a common overloaded control channel is used to jointly detect sparse user activity and sparse channel profiles. The detected information is subsequently used to demodulate the data in dedicated frequency slots. We analyze the system theoretically and provide a link between achievable rates and standard compressing sensing estimates in terms of explicit expressions and scaling laws. Finally, we support our findings with simulations in an LTE-A-like setting allowing "one shot" sparse random access of 100 users in 1ms.