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Review Comment

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Sanjay Bhardwaj, Dong-Seong Kim, " Performance Enhancement of URLLC for Industrial Wireless Application, (R) , Communication Letters, 2019
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Date : 2019-01-28
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Dear Author(s):

The review of the referenced manuscript, CL2018-2586, entitled Performance Enhancement of URLLC for Industrial Application, is now complete. I regret to inform you that based on the enclosed reviews and my own reading of your manuscript, I am unable to recommend its publication in IEEE Communications Letters. The reviewers' comments are found at the end of this email.

Thank you for submitting your work to the IEEE Communications Letters.


Prof. Berk Canberk
Associate Editor
IEEE Communications Letters

Reviewer: 1

Comments to the Author
Similar discussion had been done in wired network. It is not clear about the novelty of this paper, in especially unknown wireless environments. Specifically, the reviewer is doubtful who plays the role of the central controller, who knows all states of the unknown wireless channels e.g. shadowing, fading, SINR etc. It is also not clear if the proposed approach is scalable against network sizes with multiple source and destination pairs. If the computation time at the central controller takes too much time, there would be no guarantee the requirement of URLLC applications can be fulfilled e.g latency. The presentation of this paper is also poor with many typos and blurred figures.

Reviewer: 2

Comments to the Author
Comments to the Author:

A so called synergic control scheme for industrial application is proposed.

Moreover, several key issues must be emphasized to the authors for following modification work:

(1) Altough the industrial application is included in the title, the industry orinted physcial modeling between the nodes are not described.

The authors must prove that the presented mathematical modeling could sufficiently reflect the physical link characteristics.

(2) Why Fig 1 could meet the actual case of the current industry aplication? These is no relevant support found in the current manuscript.

(3) The quality of all figures are too poor to clearly illustrate the detials. The simulation configurations, parameters, tool and support are not presented in this edition. The authors must identify that the simulation is detailed enough to the actual application.

(4) The mathematical description in this manuscript is confusing. No one essential reference is included in this menauscript. Obviously, most of the formula are not proposed or derived by the authors. For instance, (6) and (7) are from the works of Shannon.

(5) What is the expression of Noise in this work? Which is the wirless transmission technique in this work? LTE? GSM? WiFi? or others?

(6) URLLC is one focused topic in 5G, especially for tactile netwrok, AR, or MTC, many schemes have been prosposed to maximize the realibility and minimize the latency. However, no comparsion is made between the proposed scheme and the reported ones. Although ref [1-5] are included in the Introduction part, the comparative discusstion could not been found in this edition. This is essential to prove the superiority or real gain of the proposed one.

Before above modifcation is made, I can not recommend this paper for publication.

Reviewer: 3

Comments to the Author
This manuscript proposes a synergy system model for URLLC that aims to maintain the same level of synergy the source and destination. The reviewer believes that the paper has not been prepared well and there are some issues that should be addressed.

1- The contributions should be clearly explained in Section I.

2- The English written needs to be enhanced. For example, some sentences are very long and it is very hard for the reviewer to follow them. Further, there are extra ,s that make it harder to the reviewer to read the manuscript.

3- The equations should be aligned to center.

4- Some notations are not defined. As an example, the sign V in the first paragraph of Section III is not defined.

5- Some presentations like Algorithm: 2 and Equation: 8 are not proper for IEEE publications. The authors should use them in IEEE format.

6- The results and achievements of the manuscript should be compared with the existing models and algorithms.

7- The references should be provided in IEEE standard format.

Reviewer: 4

Comments to the Author
-The synergy system model is weak and does not consider the physical aspects of the network as well as the nature of the nodes. Moreover, it is a basic derivation of the standard graph, which cannot be accounted for a novel propagation model. Thus, the authors need to clarify if the propagation dependence is on the existing or the newly formed model.

-The article uses many well-versed statements without references. This should be avoided.

-Overall the article is difficult to understand and lacks novelty. There are a lot of metrics considering industrial applications which are missing and the authors should at first define the core architecture used for the study.

-The algorithm 1 invokes algorithms 2 and 3. It instead could have been done in a single algorithm. However, in that case also, the contribution of the article refers to update on weights, which have been used by a lot of solutions over the years and this article does not add to the knowledge.

- Eqns (11)~(15) are the best case assumptions under standard mechanisms and the article fails to comply them for ultra-reliability. The actual meaning of ultra-reliability and low-latency are still missing in this article.

-The mathematical aspects of synergy are weak and there are no analytical proofs to follow. Moreover, the evaluations are standalone and do not provide any detail on how these were conducted and the results were observed.

-What are the complexities associated with the model? What are the bounds on performance? All these are missing at the moment.