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* Edit or answer any Q&A by selecting Q&A number Hyper Link below + Write button (Save)
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ICACT20210244 Question.1
Questioner: pe548be6@s.okayama-u.ac.jp 2021-02-09 오후 1:39:25 |
ICACT20210244 Answer.1
Answer by Auhor kzyano@atr.jp 2021-02-09 오후 1:39:25
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| This time, we are measuring the time stamp in an anechoic room, but are you considering a situation where interference room? |
Yes! We conducted the experiment because we wanted to correctly measure the jitters of timestamps this time. As the next step, we will conduct another experiment outside the unechoic chamber where interference arrives. |
ICACT20210244 Question.2
Questioner: kbchawal@kmitl.ac.th 2021-02-09 오후 2:38:26 |
ICACT20210244 Answer.2
Answer by Auhor kzyano@atr.jp 2021-02-09 오후 2:38:26
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| Could you share with us on the implementation details in your proposal? |
We are now developing our proposed method onto Linux PCs for system-level verification. So, after verification we may provide how to implement our proposal onto real hardware. (It will take for a month.) Anyway, please directly contact us if you need some detail information about our proposal. |
ICACT20210244 Question.3
Questioner: n.brian20202@gmail.com 2021-02-09 오후 5:48:36 |
ICACT20210244 Answer.3
Answer by Auhor kzyano@atr.jp 2021-02-09 오후 5:48:36
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| It was a material that clearly shows the effectiveness of the proposed method.
What are the disadvantages of this proposed method? |
There are two disadvantages on our proposed method.
1) We need to use TSF timestamp for microsecond-order synchronization. Nowadays, it is available at major wireless LAN modules. However, some modules don't support it.
2) Our proposed method can achieve fine synchronization among multiple nodes. However, it is on the relative time scale. If we want to precisely synchronize to the absolute time, we need to additional scheme to fix the compensated timestamps to the absolute time. |
ICACT20210244 Question.4
Questioner: jmr77@mju.ac.kr 2021-02-09 오후 6:32:58 |
ICACT20210244 Answer.4
Answer by Auhor kzyano@atr.jp 2021-02-09 오후 6:32:58
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| From the experimental results, the proposed algorithm shows the good sync performance in terms of the RMSE's metric. I would like to know the comparison with other research results and the possibility of extending the proposed method to other communication standards. |
Currently, we have not made performance comparison to other existing method. So, we need to do it to verify the advantage our proposed method.
There are some fine clock synchronization protocol such as PTP (Precision Time Protocol) better than NTP. PTP can achieve realtime clock synchronization, but clock error still remains if network is congested (expecially over wireless networks). So, we hope our proposal have some advantage.
Basically, our proposed timestamp synchronization method can apply to any communication standard. However, as shown in our presentation, the RMSE performance after synchronization highly relies on the jitter performance of the original timestamp obtained at each node. So, our proposal is suitable for IEEE 802.11 wireless LAN that provides TSF timestamp with a quite small jitter. |
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