Conflicts in the data transmission lead to a serious waste of energy, so it is pivotal to design a parallel and less conflict communication protocol for sensing nodes with limited energy. In this paper, a Parallel joint Optimized Relay Selection (PORS) protocol is proposed to reduce collision, delay as well as energy consumption for wake-up radio enabled WSNs. First, the basic Consecutive Packet Transmissions (CPT) method is adopted by PORS protocol. In this method, once a node obtains the channel, its data packets are sent continuously at once, and other nodes go to sleep in this period to reduce channel conflicts and save energy. Then, two thresholds namely maximum waiting queue length and waiting time are set for each node. When the data packets of the node do not meet the threshold, it keeps silent to reduce channel conflicts, and accumulates more packets to increase the number of data packets sent at once, thereby improving energy efficiency. Furthermore, a relay node selection approach is proposed by comprehensively considering factors such as the number of data packets, waiting time, and remaining energy. Those nodes that have many packets, long waiting time, and a large amount of remaining energy are more likely to be selected as relay nodes, so that they can receive more data packets in a short time and meet the threshold requirements as soon as possible. While the other nodes try not to obtain data and keep silent on the channel, thus reducing the collision as well as delay. Finally, the threshold values of nodes in adjacent layers differ by a constant. Thus, the crossing nodes of adjacent layers can transmit data in parallel to reduce the collision and delay Comprehensive analysis and experimental results demonstrate that the average energy consumption is reduced by 11.9%, network lifetime is increased by 26.1%, and network delay is reduced by 35.6% compared with the strategy with the fixed relaying nodes.

数据传输中的冲突会导致能源的严重浪费，因此，为传感能量有限的节点设计并行且冲突较少的通信协议至关重要。本文提出了一种并行联合优化中继选择（PORS）协议，以减少启用无线唤醒的WSN的冲突，延迟以及能耗。首先，PORS协议采用了基本的连续分组传输（CPT）方法。采用这种方法，一个节点获得信道后，立即连续发送其数据包，其他节点在此期间进入睡眠状态，以减少信道冲突并节省能量。然后，为每个节点设置两个阈值，即最大等待队列长度和等待时间。当节点的数据包未达到阈值时，它保持沉默以减少信道冲突，并积累更多的数据包，以增加一次发送的数据包的数量，从而提高能源效率。此外，通过综合考虑数据包数量，等待时间和剩余能量等因素，提出了一种中继节点选择方法。那些具有许多数据包，较长的等待时间和大量剩余能量的节点更有可能被选作中继节点，因此它们可以在短时间内接收更多数据包并尽快满足阈值要求。而其他节点尝试不获取数据并在通道上保持沉默，从而减少冲突以及延迟。最后，相邻层中节点的阈值相差一个常数。因此，