这类网络的主要特征是节点数目众多，因而接入过程碰撞严重，导致接入效率低下。

Such network consists of large number of nodes, which causes severe collision problem in the access process, inducing low access efficiency.

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另外，还可以通过增加传输延迟来减少节点碰撞。

In addition, we also can reduce the collision effects through increasing transmission delay.

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提出时分多址方式下由固定中继节点支持的透明模式下的随机接入协议，通过中继节点与用户间的合作重传来解决多个用户同时接入发生碰撞的问题。

A new random access protocol assisted by fixed relay stations under the transparent mode in multi-hop relay networks over the time division multiple access was presented.

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