覆盖距离和干扰距离如何相互影响 [英] How coverage distance and interference distance are affected by each other

问题描述

我需要知道RSU的最大覆盖距离和最大干扰距离之间的差异，以及它们之间如何相互影响.我知道覆盖距离是根据路径损耗和类似模型计算得出的，但是不知道消息接收如何受到干扰距离的影响以及其值的计算方式(例如，设置为2600m)

I need to know the difference between the maximum coverage distance of a RSU and the maximum interference distance and how they are affected by each other. I know the coverage distance is calculated from the path loss and similar models but don't know how message reception is affected by interference distance and how its value is calculated (in veins example, it is set to 2600m)

我正在实施一种方案，其中包括一辆rsu，一辆车从很远的地方驶向rsu.当我使用与静脉示例相同的值时，即使车辆距离较远，也会收到所有消息.然后，我尝试更改最大干扰的值并将其设置为260而不是2600，发生的情况是，当车辆离rsu较远时，它不会收到任何消息，而当它离rsu较近时，它将收到消息. 有人对此案有解释吗?

I am implementing a scenario including one rsu and one vehicle moves from far away towards the rsu. When i used the same values as the veins example, all messages are received even when the vehicle was far. Then i tried to change the value of maximum interference and set it to 260 instead of 2600, what happened is that when the vehicle is far away the rsu doesn't receive any messages and when it come closer to the rsu it receive the message. Does anyone have an interpretation for that case?

推荐答案

在Veins 4.6中，无线传输是通过让发送无线电模块将事件发送到范围在 的所有无线电模块来建模的.然后，这些无线电模块可以更改其内部状态，以反映以下事实:信道上的干扰已经增加，或者(如果信号足够强并且无线电已准备好接收)则正在接收新消息.

In Veins 4.6, wireless transmissions are modeled by having a transmitting radio module send an event to all radio modules that are in range. Those radio modules can then change their internal state to reflect the fact that interference on the channel has increased or (if the signal is sufficiently strong and the radio is ready to receive) that a new message is being received.

始终在模拟中通知所有无线电有关正在进行的每次传输可能会有些浪费.毕竟，大多数无线电设备可能相距太远，以至于单次传输的影响可以忽略不计.因此，静脉4.6使用MiXiM的ConnectionManager模块来确定哪个无线电应该从哪个无线电获取事件.

Always informing all radios in a simulation about each ongoing transmission might be a bit wasteful, though. After all, most radios are likely so far away that the impact of a single transmission is negligible. Veins 4.6 therefore uses MiXiM's ConnectionManager module to determine which radio should be getting events from which radio.

使用ConnectionManager 参数到2600m .换句话说，在示例仿真中，假设从2600m以外发送的任何传输都将被衰减太多(主要是建筑物)，以至于其造成的干扰也不再值得考虑.

The distance up to which events are still being considered to impact other radios is set using ConnectionManager maxInterfDist parameter. In the Veins example simulation, this parameter is set to 2600m. In other words, in the example simulation it is assumed that any transmission sent from more than 2600m away will have been attenuated so much (mostly by buildings) that even the interference it causes is no longer worth considering.

因此，将此参数设置为较大的值(例如100公里)不应更改模拟的结果，而只会导致模拟的运行速度稍慢(因为现在考虑到许多传输非常弱，因此它们不会显着改变传输速度).仿真状态).

Thus, setting this parameter to a larger value (say, 100km) should not change a simulation's results, only cause the simulation to run somewhat slower (as it is now considering many transmissions that are so weak they do not substantially alter the simulation's state).

相反，将此参数设置为较小的值(例如10m)将导致仿真产生错误的结果(因为不再考虑很多传输，即使是那些引起严重干扰的传输，也可能是因为收到成功).

Conversely, setting this parameter to a smaller value (say, 10m) will result in a simulation that gives wrong results (as it is no longer considering many transmissions, even those that cause substantial interference -- or those that could have been received successfully).

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