We propose a novel multiple-access technique to overcome the shortcomings ofthe current proposals for the future releases of Long-Term Evolution (LTE). Weprovide a unified radio access system that efficiently and flexibly integratesboth traditional cellular services and machine-to-machine (M2M) connectionsarising from Internet-of-Things (IoT) applications. The proposed solution,referred to as multi-service oriented multiple access (MOMA), is based on a)establishing separate classes of users using relevant criteria that go beyondthe simple handheld-IoT device split, b) service-dependent hierarchicalspreading of the data signals and c) a mix of multiuser and single-userdetection schemes at the receiver. Signal spreading in MOMA allows to handledensely connected devices with different quality-of-service (QoS) profiles andat the same time its flexible receiver structure allows to allocate thereceiver computational resources to the connections that need it most. Thisyields a scalable and efficient use of the available radio resources and abetter service integration. While providing significant advantages for keyfuture communications scenarios, MOMA can be incorporated into LTE with alimited impact on the protocol structure and the signaling overhead.
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