An Enhanced Random Access With Preamble-Assisted Short-Packet Transmissions for Cellular IoT Communications

Kim, Taehoon; Bang, Inkyu

doi:10.1109/lcomm.2019.2910179

Cited by 17 publications

(10 citation statements)

References 11 publications

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“…Similar to the SC scheme, (18) also shows that increasing L will improve ET, which demonstrates that HARQ helps to improve transmission efficiency. Remark 1: When P T → ∞, according to (11) and 15,…”

Section: B Effective Throughput In the Mrc Schemementioning

confidence: 82%

“…Besides, when P T → ∞, according to (13) and (18), the ETs in the SC and MRC schemes are degenerated as…”

Section: B Effective Throughput In the Mrc Schemementioning

confidence: 99%

“…Chen et al [17] proposed a wireless-powered IoT network with finite packet-length coding, where the effectivethroughput (ET) and effective-amount-of-information are adopted as performance metrics and maximized by optimizing the delay and packet error rate. An enhanced random access scheme with short-packet communications was designed to support cellular IoT communications and the results shown that the proposed scheme can meet the reliability and low-latency requirements [18]. Considering the constrained resources in IoT, Wu et al [19] adopted a short-packet for communications and an effective pilot-less one-shot transmission scheme was designed.…”

Section: Introductionmentioning

confidence: 99%

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HARQ Assisted Short-Packet Communications for Cooperative Networks Over Nakagami-m Fading Channels

2020

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Considering the coverage and short-packet communication requirements, this paper proposes a hybrid automatic repeat request (HARQ) assisted short-packet communications for cooperative Internet of Things (IoT) networks, where the signals are transmitted through short-packets. Since the short-packet communications will bring a higher packet error rate than long-packet communications, HARQ is adopted to improve transmission reliability by allowing retransmit the signals which cannot be detected correctly. For lighting the burden of the transmitter, the retransmitted signals are only sent from the relay. According to the detection capability of the user, selection combining (SC) scheme and maximum ratio combining (MRC) scheme are designed to detect the multiple transmitted signals. Besides, a set of closed-form expressions of the average packet error rate (APER) and effective throughput (ET) are derived over Nakagami-m channels in the proposed SC and MRC schemes. For providing more insights into system performance, the asymptotic results are also provided. Simulation results demonstrate that HARQ will significantly improve reliability and transmission efficiency. Also, the MRC scheme outperforms the SC scheme in terms of APER and ET metrics, however, when the transmit power at the relay is high enough or the packet length is big enough, they achieve nearly the same performance. INDEX TERMS Hybrid automatic repeat request, short-packet communications, cooperative Internet of Things.

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Section: B Effective Throughput In the Mrc Schemementioning

confidence: 82%

“…Besides, when P T → ∞, according to (13) and (18), the ETs in the SC and MRC schemes are degenerated as…”

Section: B Effective Throughput In the Mrc Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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HARQ Assisted Short-Packet Communications for Cooperative Networks Over Nakagami-m Fading Channels

2020

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“…In [38], the author proposed the energy efficient random-access scheme for internet of things (IoT). The enhanced random-access scheme with preamble assisted packet transmission to provision the IoT communication is proposed in [39]. The reference signals are used to estimate the channel status of IoT users for providing the opportunity while random access process without additional signaling.…”

Section: B Non-3gpp Random-access Proposalsmentioning

confidence: 99%

Mission Critical User Priority-Based Random Access Scheme for Collision Resolution in Coexisting PS-LTE and LTE-M Networks

Ahmad

Chang

2019

IEEE Access

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Random-access channels (RACHs) are designed to establish a connection between the user equipments (UEs) and the network. However, the current long-term evolution (LTE) standard has limitations in providing RACH resources to massive UE connections. If numerous UEs send a connection request simultaneously, it results in severe collisions and significant access delays that degrade system performance. There has been a lot of previous research into controlling this overload; however, there are no proposals to resolve RACH overload issues for mission-critical high-priority (MCHP) UEs in coexisting LTE-based public safety (PS-LTE) and LTE-based marine (LTE-M) networks. Thus, immense interest and practical research are urgently required to resolve the UE initial access problem during the random-access procedure, most importantly when MCHP users exist. In this paper, we propose an efficient mission-critical user priority-based random-access scheme for coexisting PS-LTE and LTE-M networks. Since PS-LTE users have mission-critical service requirements, we give higher priority to PS-LTE UEs when allocating RACH resources in the contention-based random-access (RA) procedure. Our proposed scheme efficiently assigns RA preambles to MCHP UEs in order to avoid preamble collisions when multiple UEs try to access coexisting PS-LTE and LTE-M networks. In this paper, the performance of the proposed scheme is analyzed and evaluated based on the number of successful RACH attempts, the number of collisions, and the access delay. The simulation results show the effectiveness of the proposed scheme. Compared with a conventional random-access scheme, the proposed scheme performs remarkably well by improving the number of successful RACH attempts, reducing the number of collisions, and minimizing the access delay to coexisting PS-LTE and LTE-M networks.

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“…The associate editor coordinating the review of this manuscript and approving it for publication was Zubair Fadlullah . energy consumption and release its connection with the base station (BS) [5]. This implies that each IoT device should perform a random access (RA) procedure to (re-)establish the connection with the BS when it has a new packet to be sent to the IoT server.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Grant-Free Multiple Access for Supporting Sporadic Traffic in Massive IoT Networks

Kim

Jung

2019

IEEE Access

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Grant-free multiple access (GFMA) protocol has been regarded as a key element to support sporadic traffic generated from massive internet-of-things (IoT) networks. In GFMA protocol, each IoT device transmits data packets without grant from a base station (BS) via pre-reserved uplink resources. Packet collisions inherently occur when multiple IoT devices transmit packets by using the same radio resource, but the collision effect can be alleviated with multi-packet reception (MPR) capability of the BS. Since a number of studies have focused on improving the physical layer performance such as bit error rate, they may be hard to provide intuitions from the MAC layer perspective when a number of IoT devices sporadically generate uplink packets and attempt the GFMA. In this paper, we thoroughly investigate the GFMA from the MAC layer perspective. We provide an analytical framework based on a Markov chain to capture the performance of the GFMA in terms of packet transmission success probability, ergodic throughput, and access delay. Through simulations, we validate our analytical framework and verify the necessity of adopting MPR technique for supporting a massive number of IoT devices generating sporadic traffic. INDEX TERMS Cellular IoT networks, grant-free multiple access, sporadic traffic, massive connectivity, multi-packet reception.

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An Enhanced Random Access With Preamble-Assisted Short-Packet Transmissions for Cellular IoT Communications

Cited by 17 publications

References 11 publications

HARQ Assisted Short-Packet Communications for Cooperative Networks Over Nakagami-m Fading Channels

HARQ Assisted Short-Packet Communications for Cooperative Networks Over Nakagami-m Fading Channels

Mission Critical User Priority-Based Random Access Scheme for Collision Resolution in Coexisting PS-LTE and LTE-M Networks

Performance Analysis of Grant-Free Multiple Access for Supporting Sporadic Traffic in Massive IoT Networks

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