International Journal of Ad Hoc & Sensor Wireless Networks ========================================================== Special Issue for MSN05 PAPER REVIEW FORM ----------------- Title: ACOS: An Area-based Collaborative Sleeping Protocol for Wireless Sensor Networks Author(s): Yanli Cai, Minglu Li, Wei Shu, and Min-You Wu Reviewer: Xiao Chen Date To Be Returned: 10 Jan 06 ----------------------------------------------------------------------------- I. NUMERICAL RATING OF THE PAPER: --------------------------------------------------------------------------- Rating Category Your Rating Scale Definition --------------------------------------------------------------------------- Level of 5=Excellent Reader Interest |-----| 4=Very good | 5 | 3=Good |-----| 2=Fair 1=Poor --------------------------------------------------------------------------- Evaluation of Work 5=Excellent work and a major contribution and Contribution |-----| 4=Good solid work of some importance | 4 | 3=Solid work but marginal contribution |-----| 2=Marginal work and very minor contribution 1=Very questionable work and contribution --------------------------------------------------------------------------- Originality 5=Highly original work Novelty |-----| 4=Contains an original contribution | 4 | 3=Somewhat original |-----| 2=Variation of a known concept 1=Complete lack of original ideas --------------------------------------------------------------------------- Practical Utility 5=Excellent |-----| 4=Very good | 3 | 3=Good |-----| 2=Fair 1=Poor --------------------------------------------------------------------------- Quality of 5=Very good Presentation |-----| 4=Basically well written | 3 | 3=Readable |-----| 2=Needs considerable work 1=Unacceptably bad --------------------------------------------------------------------------- Technical 5=Very good Correctness |-----| 4=Good | 4 | 3=Flaws but easy to correct |-----| 2=Some flaws 1=Unacceptably bad --------------------------------------------------------------------------- Overall Rating 5=Strong accept (very good quality) (could be .5) |-----| 4=Accept (good quality) | 4 | 3=Accept if room (marginal quality) |-----| 2=Likely reject (low quality) 1=Definitely reject (has no merit) --------------------------------------------------------------------------- II. SPECIFIC COMMENTS & SUGGESTIONS (to be made available to the author(s)): ------------------------------------ This paper proposes a precise and energy-aware coverage control protocol, named Area-based Collaborative Sleeping (ACOS). The protocol is based on the net sensing area of a sensor, controls the mode of sensors to maximize the coverage, minimize the energy consumption, and extend the lifetime of the sensor network. The simulations shows that the protocol has better coverage of the surveillance area while waking fewer sensors than other state-of-the-art sleeping protocols. It extends the lifetime of sensor networks significantly. However, I have the following questions: 1. on page 5, in the first paragraph, the net area threshold fi (cannot find the right symbol to represent) varies from 0 to 1. Need to state that the smaller fi, the higher degree of coverage. Otherwise the next sentence is a little bit abrupt. 2. on page 10, in the fist paragraph, if s0 continues working, s1 and s2 go to sleep, who will cover their net areas? Will that leave a coverage hole? There are many typos in the paper: 1. on page 5, the last sentence in the second paragraph, "is show" should be "is shown". 2. on page 7, the last sentence in the first paragraph, "the net area ration alpha i" should be "beta i". 3. on page 7, the first sentence in the third paragraph, "is equal or greater than" shoud be "is equal to or greater than". 4. on page 7, in the fourth paragraph, "waked-up sensors" should be "waken-up sensors". 5. on page 9, in the first paragraph, "is equal or greater" should be "is equal to or greater". 6. on page 9, in the first paragraph, "some neighbors died" should be "some neighbors have died". 7. on page 10, the last sentence in the first paragraph, "becomes greater than pi" should be "becomes greater than pi." 8. on page 10, in the second paragraph, "it updates its net area ratio beta i' and broadcasts a SleepIntent_Msg" should be "it updates its net area ratio beta i' and if it is less than fi, then broadcasts ...". 9. on page 10, the last sentence in the third paragraph, "more neighbors of sleep" should be "more neighbors to sleep". 10. on page 12, in the second paragraph, "this protocol may not suitable" should be "this protocol may not be suitable". 11. on page 13, the first sentence in the first paragraph, "is about in proportional to" should be "is about proportional to". 12. on page 15, in the second paragraph, "To measure the behaviors of each" should be "To measure the behavior of each". 13. on page 15, in the second paragraph, "are set to 2 hour" should be "are set to 2 hours". 14. on page 16, in the first paragraph, "ACOS reduces redundancy than PECAS when they try" should be "ACOS reduces more redundancy than PECAS when they try". III. CONFIDENTIAL COMMENTS (IF ANY) to be withheld from the author(s): ------------------------------------ Comments given under THIS item are for the EDITORS ONLY (to be withheld from the authors).