Abstract
The main advantage of multicast over multi-unicast is the existence of transmission reuse, i.e., the cooperation among destinations. This intrinsic characteristic benefits the multicast regarding the enhancement of transmission efficiency. Consequently, multicast is extensively studied under various wireless environments. Yet people still have limited understanding on the impact of node mobility on the transmission reuse when multicast is applied instead of multiple unicast. In this paper, we focus on the correlated mobility which captures the feature of real mobility processes, to study its influence on transmission reuse in mobile ad hoc networks (MANETs). Specifically, we quantify the transmission reuse as multicast gain , i.e., the capacity ratio of multicast and multi-unicast under certain delay constraint. We design a multi-layer routing protocol and propose different kinds of causal scheduling policies, under which the overall multicast capacity-delay tradeoff is derived by exploring various correlation degrees of node mobility. Compared with the capacity-delay tradeoff in unicast case, we calculate the multicast gain. Results show that the correlation of node mobility greatly influences the multicast gain, and in certain cases network can achieve the upper bound of multicast gain regardless of the logarithmic factor.
Highlights
Multicast, an one-to-many traffic pattern, enables network links to be reused when a single source serves multiple destinations
As for the mobile situation where the topology changes over time, we doubt if the capacity gain can still be achieved when operating multicast instead of multi-unicast? In this paper, we study the above problem by utilizing the correlated mobility model [14], [15], which covers a broad range of mobility models and captures the feature of real mobility processes [16]–[19]
Based on the multicast gain we study, we have the following interesting observations: 1) The correlation of node mobility is an essential feature that affects the node cooperation and link reuse during multicast communications in a wide range
Summary
An one-to-many traffic pattern, enables network links to be reused when a single source serves multiple destinations. Some literatures focused on improving the multicast capacity and delay via infrastructure support [10], network coding [11] and cooperation among nodes [12], [13] In these works, results demonstrate that mobility can increase the multicast capacity and different mobility models bring different capacity gains, compared with the static case. We calculate the multicast gain under various correlation degrees of node mobility, compared with the capacity-delay tradeoff in unicast case. Based on the multicast gain we study, we have the following interesting observations: 1) The correlation of node mobility is an essential feature that affects the node cooperation and link reuse during multicast communications in a wide range. Depending on the values of β and v, we can divide our analysis into two different regimes: 1) cluster sparse regime (v + 2β < 1): the total areas mR2 that all clusters cover is o (n), which shows strong correlation of node mobility; 2) cluster dense regime (v + 2β ≥ 1): the total areas mR2 that all clusters cover is ω (n), which shows weak correlation of node mobility.
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