中文摘要：

考虑一个由四个节点级联组成的双源双宿三跳网络模型，网络工作在时分双工（TDD)模式下，中继采用解码-转发（DF)策略，分析其容量区域，并对容量区域的分配问题进行研究。依据割集上界定理和最大流-最小割的方法，提取网络信道的数学模型，研究网络的容量区域并证明容量上界的可达性。通过调整每一跳信道容量的分配，提升网络的传输消息的速率。仿真结果表明，改变不同跳的信道容量，能够对网络传输消息的速率进行调度。

英文摘要：

We took into consideration a three-hop networks model with dual source dual destination composed of four nodes in cascade,the network operates in time division duplex (TDD)mode,its relay uses the strategy of decoding-forwarding (DF).We analysed its capacity region and studied the distribution issue of the capacity region.According to the upper bound theorem of cut set and the maximum flow and minimum cut method,we extracted the mathematical model of network channel,studied the capacity region of network and proved the accessibility of capacity upper bound.Through adjusting the distribution of channel capacity of each hop,we improved the rate of message transmission in networks.It is indicated by simulation results that by the alternation in channel capacity of different hops can schedule the rate of transmitting the message in networks.