NDLI: Delay and capacity tradeoff analysis for motioncast

Content Provider	ACM Digital Library
Author	Zhang, Jinbei Wang, Shangxing Hu, Chenhui Wang, Xinbing Huang, Wentao
Copyright Year	2012
Abstract	In this paper, we define multicast for an ad hoc network through nodes' mobility as MotionCast and study the delay and capacity tradeoffs for it. Assuming nodes move according to an independently and identically distributed (i.i.d.) pattern and each desires to send packets to $\textit{k}$ distinctive destinations, we compare the delay and capacity in two transmission protocols: one uses 2-hop relay algorithm without redundancy; the other adopts the scheme of redundant packets transmissions to improve delay while at the expense of the capacity. In addition, we obtain the maximum capacity and the minimum delay under certain constraints. We find that the per-node delay and capacity for the 2-hop algorithm without redundancy are $Θ(1/\textit{k})$ and $Θ(\textit{n}$ log $\textit{k}),$ respectively; for the 2-hop algorithm with redundancy, they are $Ω(1/\textit{k}√\textit{n}$ log $\textit{k})$ and $Θ(√\textit{n}$ log $\textit{k}),$ respectively. The capacity of the 2-hop relay algorithm without redundancy is better than the multicast capacity of static networks developed by Li [IEEE/ACM Trans. Netw., vol. 17, no. 3, pp. 950-961, Jun. 2009] as long as $\textit{k}$ is strictly less than $\textit{n}$ in an order sense, while when $\textit{k}$ = $Θ(\textit{n}),$ mobility does not increase capacity anymore. The ratio between delay and capacity satisfies delay/rate ≥ $\textit{O}(\textit{nk}$ log $\textit{k})$ for these two protocols, which are both smaller than that of directly extending the fundamental tradeoff for unicast established by Neely and Modiano [IEEE Trans. Inf. Theory, vol. 51, no. 6, pp. 1917-1937, Jun. 2005] to multicast, i.e., delay/rate ≥ $O(nk^{2}).$ More importantly, we have proved that the fundamental delay-capacity tradeoff ratio for multicast is delay/rate ≥ $\textit{O}(\textit{n}$ log $\textit{k}),$ which would guide us to design better routing schemes for multicast.
Starting Page	1354
Ending Page	1367
Page Count	14
File Format	PDF
ISSN	10636692
DOI	10.1109/TNET.2011.2109042
Volume Number	19
Issue Number	5
Journal	IEEE/ACM Transactions on Networking (TON)
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2011-10-01
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Capacity Delay Multicast Scaling law
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Networks and Communications Software Computer Science Applications

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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