13 research outputs found
Reliable Reporting for Massive M2M Communications with Periodic Resource Pooling
This letter considers a wireless M2M communication scenario with a massive
number of M2M devices. Each device needs to send its reports within a given
deadline and with certain reliability, e. g. 99.99%. A pool of resources
available to all M2M devices is periodically available for transmission. The
number of transmissions required by an M2M device within the pool is random due
to two reasons - random number of arrived reports since the last reporting
opportunity and requests for retransmission due to random channel errors. We
show how to dimension the pool of M2M-dedicated resources in order to guarantee
the desired reliability of the report delivery within the deadline. The fact
that the pool of resources is used by a massive number of devices allows to
base the dimensioning on the central limit theorem. The results are interpreted
in the context of LTE, but they are applicable to any M2M communication system.Comment: Submitted to journa
Error Floor Analysis of Coded Slotted ALOHA over Packet Erasure Channels
We present a framework for the analysis of the error floor of coded slotted
ALOHA (CSA) for finite frame lengths over the packet erasure channel. The error
floor is caused by stopping sets in the corresponding bipartite graph, whose
enumeration is, in general, not a trivial problem. We therefore identify the
most dominant stopping sets for the distributions of practical interest. The
derived analytical expressions allow us to accurately predict the error floor
at low to moderate channel loads and characterize the unequal error protection
inherent in CSA
What Can Wireless Cellular Technologies Do about the Upcoming Smart Metering Traffic?
The introduction of smart electricity meters with cellular radio interface
puts an additional load on the wireless cellular networks. Currently, these
meters are designed for low duty cycle billing and occasional system check,
which generates a low-rate sporadic traffic. As the number of distributed
energy resources increases, the household power will become more variable and
thus unpredictable from the viewpoint of the Distribution System Operator
(DSO). It is therefore expected, in the near future, to have an increased
number of Wide Area Measurement System (WAMS) devices with Phasor Measurement
Unit (PMU)-like capabilities in the distribution grid, thus allowing the
utilities to monitor the low voltage grid quality while providing information
required for tighter grid control. From a communication standpoint, the traffic
profile will change drastically towards higher data volumes and higher rates
per device. In this paper, we characterize the current traffic generated by
smart electricity meters and supplement it with the potential traffic
requirements brought by introducing enhanced Smart Meters, i.e., meters with
PMU-like capabilities. Our study shows how GSM/GPRS and LTE cellular system
performance behaves with the current and next generation smart meters traffic,
where it is clearly seen that the PMU data will seriously challenge these
wireless systems. We conclude by highlighting the possible solutions for
upgrading the cellular standards, in order to cope with the upcoming smart
metering traffic.Comment: Submitted; change: corrected location of eSM box in Fig. 1; May 22,
2015: Major revision after review; v4: revised, accepted for publicatio
Reliable and Efficient Access for Alarm-initiated and Regular M2M Traffic in IEEE 802.11ah Systems
EEE 802.11ah is a novel WiFi-based protocol, aiming to provide an access
solution for the machine-to-machine (M2M) communications. In this paper, we
propose an adaptive access mechanism that can be seamlessly incorporated into
IEEE 802.11ah protocol operation and that supports all potential M2M reporting
regimes, which are periodic, on-demand We show that it is possible to both
efficiently and reliably resolve all reporting stations in the cell, within the
limits of the allowed deadlines. As a side result, we also provide a rationale
for modeling the inter-arrival time in alarm events by using the Beta
distribution, a model that is considered in the 3GPP standardization.Comment: Appeared in IEEE IoT Journal, October 201
A Framework for Ultra Reliable Low Latency Mission Critical Communication
Title from PDF of title page viewed June 22, 2017Thesis advisor: Cory BeardVitaIncludes bibliographical references (pages 26-29)Thesis (M.S.)--School of Computing and Engineering. University of Missouri--Kansas City, 2017Mission-critical communication is one of the central design aspects of 5G
communications. But there are numerous challenges and explicit requirements for
development of a successful mission-critical communication system. Reliability and delay
optimization are the two most crucial among them. Achieving reliability is influenced by
several difficulties, including but not limited to fading, mobility, interference, and inefficient
resource utilization. Achieving reliability may cost one of the most critical features of mission
critical communication, which is delay. This thesis discusses possible strategies to achieve
reliability in a mission-critical network. Based on the strategies, a framework for a reliable
mission-critical system has also been proposed. A simulation study of the effects of different
pivotal factors that affect communication channel is described. This study provides a better
understanding of the requirements for improving the reliability of a practical communication
system.Introduction -- Related works -- Case studies for mission critical communication -- Strategies to achieve ultra-reliable M2M -- Adaptive mimo system with OSTBC -- Simulation results -- Conclusions and future aspect