A developing standard for remote bridging at the MAC layer.
正在开发的用于MAC层远端桥接的标准。
NRED is located at the network layer, and has no need of any modification in MAC layer.
而且这种机制是在网络层实现的，不必对MAC层协议进行修改。
To perform requested transmissions, the MAC layer receives HARQ information from lower layers.
为了执行被请求的传输，MAC层从低层接收HARQ信息。
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