论文标题
在UAN的插槽Mac上的时空耦合的影响和分析
Impact and analysis of space-time coupling on slotted MAC in UANs
论文作者
论文摘要
在水下声网（UAN）中，传播延迟不可忽略，因为传播速度比光速小五个数量级。在这种情况下，有很强的空间和时间因素是强烈的，以确定数据包传输的碰撞。为此，本文分析了空间时间耦合对开槽中访问控制（MAC）的影响。我们发现可能存在斜线间和插槽碰撞，并且插槽间的碰撞可能跨越多个插槽。发送插槽依赖性干扰区域可能是整个传输范围内的环。可以指出的是，当插槽设置中使用大于数据包持续时间的后卫间隔时，存在无碰撞区域。从这个意义上讲，长插槽将空间重复使用在变速箱范围内。但是，我们进一步发现，一个数据包持续时间和两个数据包持续时间的插槽长度成功的传输概率和吞吐量相同。仿真结果表明，可以通过小于数据包持续时间的后卫间隔来实现最大成功的传输概率和吞吐量，这比典型的插入式aloha中现有的插槽设置要短得多。模拟还表明，由于三维UAN中垂直传输范围较长，垂直传输的空间影响比水平传输更大。
The propagation delay is non-negligible in underwater acoustic networks (UANs) since the propagation speed is five orders of magnitude smaller than the speed of light. In this case, space and time factors are strongly coupled to determine the collisions of packet transmissions. To this end, this paper analyzes the impact of spatial-time coupling on slotted medium access control (MAC). We find that both inter-slot and intra-slot collisions may exist, and the inter-slot collision may span multiple slots. The sending slot dependent interference regions could be an annulus inside the whole transmission range. It is pointed out that there exist collision-free regions when a guard interval larger than a packet duration is used in the slot setting. In this sense, the long slot brings spatial reuse in a transmission range. However, we further find that the successful transmission probabilities and throughput are the same for the slot lengths of one packet duration and two packet durations. Simulation results show that the maximum successful transmission probability and throughput can be achieved by a guard interval less than a packet duration, which is much shorter than the existing slot setting in typical Slotted-ALOHA. Simulations also show that the spatial impact is greater for vertical transmission than for horizontal transmissions due to the longer vertical transmission range in three-dimensional UANs.
