Optimized broadcast scheme for mobile ad hoc networks

Ahmed Amari, N. Achir, P. Mühlethaler, A. Laouiti
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Abstract

In this paper we propose an optimized broadcasting mechanism which uses very limited signaling overhead. The main objective is to select the most appropriate relay nodes according to a given cost function. Basically, after receiving a broadcast packet each potential relay node computes a binary code according to a given cost function. Then, each node starts a sequence of transmit/listen intervals following this code. In other words, each 0 corresponds to a listening interval and each 1 to a transmit interval. During this active acknowledgment signaling period, each receiver applies the following rule: if it detects a signal during any of its listening intervals, it quits the selection process, since a better relay has also captured the packet. Finally, we split the transmission range into several sectors and we propose that all the nodes within the same sector use the same CDMA orthogonal spreading codes to transmit their signals. The CDMA codes used in two different sectors are orthogonal, which guarantees that the packet is broadcast in all possible directions.
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移动自组网广播方案优化
在本文中,我们提出了一种优化的广播机制,它使用非常有限的信令开销。主要目标是根据给定的成本函数选择最合适的中继节点。基本上,在接收到广播包后,每个潜在中继节点根据给定的代价函数计算一个二进制码。然后,每个节点按照该代码启动一系列发送/侦听间隔。换句话说,每个0对应一个侦听间隔,每个1对应一个传输间隔。在此主动确认信令期间,每个接收方应用以下规则:如果在任何侦听间隔期间检测到信号,则退出选择过程,因为更好的中继也捕获了数据包。最后,我们将传输范围划分为若干扇区,并建议同一扇区内的所有节点使用相同的CDMA正交扩展码来传输其信号。在两个不同的扇区中使用的CDMA码是正交的,这保证了数据包在所有可能的方向上广播。
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