Enhancement of LTE RACH through extended random access process

Kim, J.S.; Munir, Daniyal; Hasan, Syed Faraz; Chung, Min Young

doi:10.1049/el.2014.1159

Cited by 22 publications

(18 citation statements)

References 3 publications

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“…The procedure described in subsection 2.1 was extended in Reference through a simple modification. That is, after the base station performs the detection of preambles, it sends back a RAR containing multiple responses for each identified preamble, with different uplink resources assigned.…”

Section: Technical Description Of Compared Random Access Schemesmentioning

confidence: 99%

“…To better support emerging MTC services, the worldwide scientific community is devoting a large interest in the research of RACH schemes with greater capacity and tolerance of traffic peaks, to be employed in 5th generation (5G) mobile networks. Promising solutions are presented in References .…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, at the time of this writing, a good performance evaluation of methods presented in References is still missing for the case of synchronous transmission from a very large number of devices.…”

Section: Introductionmentioning

confidence: 99%

“…To bridge this gap, this letter investigates, through system‐level simulations, the performance of 2 reference schemes, when used in emergency scenarios. Specifically, the conducted study considers the method currently used in LTE and its improved version suitable for the 5G, as described in Reference . It is important to note that the reference contribution discussed in Reference is not sufficient to clarify the advantages provided by the new RACH procedure (which is candidate for the 5G) with respect to the baseline approach already used in LTE, especially in challenging scenario with very high traffic loads.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, the conducted study considers the method currently used in LTE and its improved version suitable for the 5G, as described in Reference . It is important to note that the reference contribution discussed in Reference is not sufficient to clarify the advantages provided by the new RACH procedure (which is candidate for the 5G) with respect to the baseline approach already used in LTE, especially in challenging scenario with very high traffic loads. In fact, it investigates the first step of the access protocol, thus reporting a packet loss probability due to preamble collisions only; it considers a uniform probability distribution for incoming requests, which is not compatible with emergency scenarios targeted in this letter; and it evaluates the performance of networks with a limited number of devices.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A look at random access for machine‐type communications in 5th generation cellular networks

Grassi

Piro

Boggia

2017

Internet Technology Letters

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Machine-type communications represent a major challenge for the upcoming 5th generation (5G) technology. Future cellular systems, in fact, will be in charge of supporting a huge number of devices generating sporadic small packets at random times. In this context, the random access channel (RACH) protocol is generally used to initiate the communication sessions, aimed at delivering this kind of traffic. But, occasional peaks of requests, generated when many devices react to the same event, may severely degrade network performance (ie, by increasing the collision probability). This letter investigates, through computer simulations, the performance of well-known procedures for the RACH, designed for the current 4th generation technology and the upcoming 5G system in challenging scenarios never seen before. Specifically, the evaluation targets access peaks caused by emergency situations, including every phase of the protocol from the initial contention to the transmission of the application payload. Obtained results highlight pros and cons of available solutions, while showing challenging issues that should be carefully addressed in future research activities.

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Section: Technical Description Of Compared Random Access Schemesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A look at random access for machine‐type communications in 5th generation cellular networks

Grassi

Piro

Boggia

2017

Internet Technology Letters

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A multiple power level random access method for M2M communications in LTE‐A network

Alavikia

Ghasemi

2016

Trans. Emerging Tel. Tech.

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Access control is an effective way to protect the radio access part of Long‐Term Evolution–Advanced (LTE‐A) network from the overload caused by a huge number of Machine‐Type Communication Devices (MTCDs). A class of access control mechanisms is the Access Class Barring (ACB), which regulates the Machine‐to‐Machine (M2M) traffic in accordance with the available Random Access (RA) resources. In this paper, we extend the single power level ACB scheme to a multiple power level method to increase the number of successfully transmitted requests in the case of overload. Our analysis is based on the capture effect in the third step of RA procedure of the LTE‐A system in which one of the transmitted requests by 2 or more co‐tagged MTCDs, MTCDs which use the same preamble in the first step, can be decoded by the evolved–Node B (eNB). We first formulate the power level selection as an optimization problem assuming the perfect capture model without considering MTCDs' energy budget. Then, to take into account MTCDs' energy consumption, the scenario is extended for the signal‐to‐interference ratio–based capture model. In addition, we investigate the advantages of the proposed multiple power level RA method on discriminating the access of MTCDs with different priorities. The numerical results show that using the optimal parameters, the RA throughput can be improved in comparison with the single power level system at the cost of slightly increasing MTCDs' energy consumption and the complexity of RA procedure.

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Evolution of random access process: From Legacy networks to 5G and beyond

Toor

Basit

Maroof

et al. 2019

Trans Emerging Tel Tech

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In this paper, we discuss the random access procedures in legacy networks, long-term evolution, LTE-Advanced, and 5G networks. Random access is the first and incumbent step for connection establishment between base station/eNodeB/gNodeB and user equipment. Keeping in view its importance, there has been a regular thrive to improve the procedures of random access in communication networks. With the advent of new concepts such as machine-type communication and Internet of Things, random access becomes extremely critical because huge number of devices try to connect to the network simultaneously. We present the evolution of random access process from legacy networks such as global system for mobile or wideband code division multiple access to 5G networks and beyond and their analysis. Simulations are performed in MATLAB to show various performance metrics such as access delay, total service time, and collision probability to demonstrate the pros and cons of one technique over another.

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Enhancement of LTE RACH through extended random access process

Cited by 22 publications

References 3 publications

A look at random access for machine‐type communications in 5th generation cellular networks

A look at random access for machine‐type communications in 5th generation cellular networks

A multiple power level random access method for M2M communications in LTE‐A network

Evolution of random access process: From Legacy networks to 5G and beyond

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