If the unmappedChannel is a used channel according to the channel map, the channel selection algorithm shall use the unmappedChannelas the data channel index for the connection event.
If the unmappedChannel is an unused channel according to the channel map, the unmappedChannelshall be re-mapped to one ofthe used channels in the
channel map using the following algorithm
core_v4.0里面的一段话,请教一下,unmappedChannel 与a used channel和an unused channel 之间什么关系,没有映射的channel与没有使用的channel不是一回事吗?谢谢