Ultra-reliable short message cooperative relaying protocols under Nakagami-m fading

Abstract

In the next few years, the development of wireless communication systems propel the world into a fully connected society where the Machine-type Communications (MTC) plays a substantial role as key enabler in the future cellular systems. MTC is categorized into mMTC and uMTC, where mMTC provides the connectivity to massive number of devices while uMTC is related to low latency and ultrahigh reliability of the wireless communications. This paper studies uMTC with incremental relaying technique, where the source and relay collaborate to transfer the message to a destination. In this paper, we compare the performance of two distinct cooperative relaying protocols with the direct transmission under the finite blocklength (FB) regime. We define the overall outage probability in each relaying scenario, supposing Nakagami-m fading. We show that cooperative communication outperforms direct transmission under the FB regime. In addition, we examine the impact of fading severity and power allocation factor on the outage probability and the minimum delay required to meet the ultra-reliable communication requirements. Moreover, we provide the outage probability in closed form.Index Terms-Finite blocklength, Machine-type communications, Cooperative relaying transmission, Outage probability, Nakagami-m fading.

Performance analysis of ultra-reliable short message decode and forward relaying protocols

“…We also provide the outage probability in closed form. Our works in [31] and [30] show that cooperative diversity os useful to meet URLLC requirements.…”

“…Broadcasting phase • We extend the work in [18], by proposing the closed form expression for the outage probability. • We extend our previous works in [30], [31] by studying the minimum latency and energy efficiency under two distinct power constraints, so-called i) equal power allocation (EPA) and ii) optimal power allocation (OPA) strategies which are allocated numerically. • We provide the asymptotic analysis of studied cooperative schemes.…”

In-Band Pilot Overhead in Ultra-Reliable Low Latency Decode and Forward Relaying

“…Stringent latency and reliability requirements of URLLC with FB may be hard to achieve with traditional communication techniques. Our prior work in [4] and [5] shows that cooperative relaying is a potential solution to guarantee ultra-reliability and meet URLLC requirements. A large body of work has studied, the impact of cooperative diversity in several systems and channel models.…”

“…The performance and design of wireless systems highly depend on the channel conditions which motivates us to examine the impact of channel knowledge in URLLC. Differently from our previous works [4], [5] which assume ideal channel esti-mation, herein we aim to investigate the impact of channel estimation overhead on the performance of decode-andforward (DF) cooperative communications in URLLC. The contributions of this work are: iq we extend our previous works in [4] and [5] by studying the impact of channel estimation on cooperative communications over Rayleigh fading channels subject to two distinct power constraints; peak power constraint (PPC) and average power constraint (APC) iiq we indicate the impact of PPC factor on URLLC performance metrics such as minimum latency and goodput in cooperative and non-cooperative transmissions with optimal training overhead, iiiq we illustrate the impact of peak power constraint factor on the training sequence and derive the optimal number of pilots in closed form.…”

Joint Power Control and Rate Allocation Enabling Ultra-Reliability and Energy Efficiency in SIMO Wireless Networks

“…Regarding this last aspect, notice that (17) does not converge for κ = 20 and also for κ = 12, M = 10, Fυ(x) ≥ 10 −4 , just for mentioning two examples 10. Note that there software packages to evaluate the inverse gamma function, e.g., gammaincinv in MatLab and InverseGammaRegularized in Wolfram Mathematica.…”