A Latency-Aware Offloading Strategy over Fiber-Wireless (FiWi) Infrastructures for Tactile Internet Services
Round 1
Reviewer 1 Report
This paper proposes resource management over FiWi Infrastructure for TI services with offloading strategy.
Some majors concerns:
1. More state-of-the-art in the introduction section can be added to show the important aspect of this study. For instance, different approaches to FiWi architecture.
2. Providing a notation table containing all the symbols can help the reader to understand, especially in Section 3.
3. Please clarify why more than one OLT is simulated. What kind of mechanism is being simulated? (e.g., TDMA, WDMA)
4. The author(s) mentioned enhancing the TI traffic, however, in the simulation there is no supporting evidence. Additional simulation indicators can be added.
5. Fig. 3 is confusing, why there are multiple same # of data transmission rates on the Y-axis.
Author Response
Thank you for your comments concerning our manuscript entitled “A Latency-aware Offloading Strategy over Fiber-Wireless (FiWi) Infrastructures for Tactile Internet Services”.
Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our research.
We have studied the comments carefully and have made corrections which we hope meet with approval.
Revised portions are marked in red in this paper.
The main correction in the paper and the responses to the reviewer’s comments are as follows:
- More state-of-the-art in the introduction section can be added to show the important aspect of this study. For instance, different approaches to FiWi architecture.
Response: To demonstrate the importance of this work, a paragraph on different approaches in FiWi architecture was added on Page 1.
- Providing a notation table containing all the symbols can help the reader to understand, especially in Section 3.
Response: A key notation table was added on Page 4.
- Please clarify why more than one OLT is simulated. What kind of mechanism is being simulated? (e.g., TDMA, WDMA)
Response: To display the interaction of ONUs, MPPs, and MAPs, more than one OLT is simulated. The passive optical network (PON) in our simulation is wavelength division multiplexing (WDM)-based.
- The author(s) mentioned enhancing the TI traffic, however, in the simulation there is no supporting evidence. Additional simulation indicators can be added.
Response: The tactile internet service mentioned in our work is used to explain the necessity and urgency of persuing low latency. The work on enhancing tactile traffic will be conducted in our future work.
- Fig. 3 is confusing, why there are multiple same # of data transmission rates on the Y-axis.
Response: To display the different Y-axis labels clearly, Fig. 3 has been changed, on Page 10. The difference in Fig. 3 results is really minor.
Reviewer 2 Report
The article is very well written and addresses a current and interesting topic.
I have just a few minor remarks (in the most, just typos) which are listed below:
1 - pg. 4 - 146 : "...ther fiber..."
2 - pg 6 - "...objective function ..."
3. - pg. 7 - eq. 19 - In the equation the authors used the Gamma_ij variable and in the text, they referred as Beta_ij
4. Fig. 3 - It is too difficult to evaluate the control group in this Figure. I a not sure - I would recommend some other way to illustrate these data.
5. pg. 10 - "...Wh the data..."
Author Response
Thank you for your comments concerning our manuscript entitled “A Latency-aware Offloading Strategy over Fiber-Wireless (FiWi) Infrastructures for Tactile Internet Services”.
Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our research.
We have studied the comments carefully and have made corrections which we hope meet with approval.
Revised portions are marked in red in this paper.
The main correction in the paper and the responses to the reviewer’s comments are as follows:
1 - pg. 4 - 146 : "...ther fiber..."
Response: This mistake was corrected on Page 5, Line 156.
2 - pg 6 - "...objective function ..."
Response: This mistake was corrected on Page 7, Line 175.
- - pg. 7 - eq. 19 - In the equation the authors used the Gamma_ij variable and in the text, they referred as Beta_ij
Response: This mistake was corrected on Page 8, Line 184.
- Fig. 3 - It is too difficult to evaluate the control group in this Figure. I a not sure - I would recommend some other way to illustrate these data.
Response: Fig.3 was replaced with a new
- pg. 10 - "...Wh the data..."
Response: This mistake was corrected on Page 11, Line 246.
Round 2
Reviewer 1 Report
The reviewer is not satisfied with the author's answer. The introduction is not sufficient enough to show the novelty of this paper. The authors have already added three new references, yet without any explanation to show what is the advantage of their approaches compared to other works.
Moreover, more results should be simulated to show the evaluation of the authors' proposed mechanism. If no further simulation/analysis of how the authors' mechanism offloading and increasing the tactile internet services, perhaps the title of this paper should be changed.
The authors are using WDM-PON based for the fiber backhaul. However, it shows nothing in the simulation regardless of the # of wavelengths, the capacity, etc.
Author Response
Thank you for your comments concerning our manuscript entitled “A Latency-aware Offloading Strategy over Fiber-Wireless (FiWi) Infrastructures for Tactile Internet Services”.
Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our research.
We have studied the comments carefully and have made corrections which we hope meet with approval.
Revised portions are marked in blue in this paper.
The main correction in the paper and the responses to the reviewer’s comments are as follows:
1.The reviewer is not satisfied with the author's answer. The introduction is not sufficient enough to how the novelty of this paper. The authors have already added three new references, yet without any explanation to show what is the advantage of their approaches compared to other works.
Response: The analysis of these added three new references on Page 2, Line 41. The differences between our work and the selected control group are added in the contributions of our work on Page 2, Line 72. We think these contributions are the novelty of this paper. Some explanations about the tactile internet service and the network circumstance of our work are also added on Page 2.
2.Moreover, more results should be simulated to show the evaluation of the authors' proposed mechanism. If no further simulation/analysis of how the authors' mechanism offloading and increasing the tactile internet services, perhaps the title of this paper should be changed.
Response: More numerical simulation results, i.e., Fig. 7 and Fig. 8, are added. The tactile internet services are analyzed on Page 5, Line 169. They are also taken into consideration in the newly added simulation.
3.The authors are using WDM-PON based for the fiber backhaul. However, it shows nothing in the simulation regardless of the # of wavelengths, the capacity, etc.
Response: The simulation of a WDM-based fiber network and corresponding analysis are added on Page 9, Line 311.
Author Response File: 
Author Response.pdf
Round 3
Reviewer 1 Report
Thank you for the authors' effort to improve this paper.
One final concern is:
State clearly in the simulation section what kind of DBA/DWBA has been used and what about the traffic scenarios.
Author Response
Response to Reviewer 1
Thank you for your comments concerning our manuscript entitled “A Latency-aware Offloading Strategy over Fiber-Wireless (FiWi) Infrastructures for Tactile Internet Services”.
Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our research.
We have studied the comments carefully and have made corrections which we hope meet with approval.
Revised portions are marked in orange in this paper.
The main correction in the paper and the responses to the reviewer’s comments are as follows:
State clearly in the simulation section what kind of DBA/DWBA has been used and what about the traffic scenarios.
Response: The content about DBA is added on Page 9, Line 215. The content on the traffic scenarios is added on Page 10, Line 231.
