Performance Approximation of Persistent Relay CSMA with Carry-over of Backoff Counter Freezing After Collision
Performance Approximation of Persistent Relay CSMA with Carry-over of Backoff Counter Freezing After Collision
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发表时间：
2015
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通讯作者：
K. Sakakibara;Taku Harada;Jumpei Taketsugu
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作者：
K. Sakakibara;Taku Harada;Jumpei Taketsugu
已经研究了与一个或多个中继节点的协作传输。我们建议将冲突后的退避计数器冻结结转到持久中继载波侦听多址接入（PRCSMA），其中两个或多个中继节点合作支持在公共信道上重传源自源节点的帧。该协议的性能近似分析通过马尔可夫模型。通过计算机模拟艾德了近似的准确性。通过执行退避计数器冻结，即，通过延迟退避计数器递减，仅将下一时隙中的帧传输的优先级给予涉及帧冲突的节点。因此，可以减轻连续碰撞的可能性。仿真结果表明，该协议可以大大提高原PRCSMA的性能。通过执行退避计数器冻结，可以降低连续帧冲突的可能性。这成功地避免了一系列灾难性的帧冲突，并大大减少了合作阶段。
: Cooperative transmission with one or more relay nodes has been investigated. We propose incorporation of the carry-over of backoff counter freezing after collision to Persistent Relay Carrier Sense Multiple Access (PRCSMA), in which two or more relay nodes cooperatively support retransmission of frame originated from source node over a common channel. The performance of the proposed protocol is approximately analyzed by means of a Markovian model. The accuracy of the approximation is verified by compute simulations. By carrying over the backoff counter freezing, that is, by deferring the backoff counter decrement, the priority of frame transmission in the next time slot is given to only nodes involved in frame collision. Therefore, the possibility of consecutive collision can be mitigated. Numerical results reveal that the proposed protocol can greatly improve the performance of the original PRCSMA. By carrying over the backoff counter freezing, the possibility of consecutive frame collisions can be reduced. This successfully leads to avoidance of a catastrophic series of frame collisions and considerable reduction of cooperation phase.