Efficient LTE Access with Collision Resolution for Massive M2M Communications

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LTE random access procedure performs satisfactorily in case of asynchronous, uncorrelated traffic arrivals. However, when the arrivals are correlated and arrive synchronously, the performance of the random access channel (RACH) is drastically reduced, causing a large number of devices to experience outage. In this work we propose a LTE RACH scheme tailored for delay-sensitive M2M services with synchronous traffic arrivals. The key idea is, upon detection of a RACH overload, to apply a collision resolution algorithm based on splitting trees. The solution is implemented on top of the existing LTE RACH mechanism, requiring only minor modifications of the protocol operation and not incurring any changes to the physical layer. The results are very promising, outperforming the related solutions by a wide margin. As an illustration, the proposed scheme can resolve 30k devices with an average of 5 preamble transmissions and delay of 1.2 seconds, under a realistic probability of transmissions error both in the downlink and in the uplink.
Original languageEnglish
Title of host publicationProceedings of the 2014 IEEE Global Communications Conference (GLOBECOM)
PublisherIEEE Communications Society
Publication date2014
Publication statusPublished - 2014
EventGlobecom 2014 - Austin, United States
Duration: 8 Dec 201412 Dec 2014


ConferenceGlobecom 2014
Country/TerritoryUnited States
SeriesGLOBECOM - conference record / IEEE Global Telecommunications Conference


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