Full-duplex radio is a next-generation wireless communication technology, because it allows signals to be sent and received simultaneously within the same channel by cancelling self-interference signals. Thus, many full-duplex medium access control (MAC) protocols have been proposed to utilize the full-duplex radio. For backward compatibility with legacy stations (STAs), most of them operate based on the IEEE 802.11 distributed coordination function, which is a competition-based distributed method. Consequently, collisions among STAs are still an important problem in designing a full-duplex MAC protocol. Unlike traditional half-duplex radio, full-duplex radio can sense incoming signals during transmission. Therefore, a novel collision resolution method suitable for the full-duplex radio is required. In this paper, we propose a new collision resolution method called collision decoding and reporting (CDR). In this method, if a collision is detected, each transmitter STA tries to decode another transmitter STA’s frame by cancelling self-interference signals, and memorizes a decoded transmission information. Afterwards, it reports the decoded transmission information to access point (AP) by using its data frame. As a result, the AP knows that another transmitter STA has data to transmit, and offers a transmission opportunity to another transmitter STA without competition. Therefore, the throughput of wireless local area networks increases by reducing competition overheads such as idle back-off slots and collisions. To evaluate the performance of the CDR method, analytical evaluations and simulations have been performed. We observed that the proposed method achieves a throughput gain compared to existing collision resolution methods.

全双工无线电是下一代无线通信技术，因为它允许通过消除自干扰信号在同一信道中同时发送和接收信号。因此，已经提出了许多全双工媒体访问控制（MAC）协议来利用全双工无线电。为了与传统站点（STA）向后兼容，它们中的大多数都基于IEEE 802.11分布式协调功能运行，这是一种基于竞争的分布式方法。因此，STA之间的冲突仍然是设计全双工MAC协议时的重要问题。与传统的半双工无线电不同，全双工无线电可以在传输过程中感应输入信号。因此，需要一种适用于全双工无线电的新颖的冲突解决方法。在本文中，我们提出了一种新的冲突解决方法，称为冲突解码和报告（CDR）。在该方法中，如果检测到冲突，则每个发送器STA试图通过消除自干扰信号来解码另一个发送器STA的帧，并且存储解码的发送信息。之后，它使用其数据帧将解码后的传输信息报告给接入点（AP）。结果，AP知道另一发送器STA具有要发送的数据，并且在没有竞争的情况下向另一发送器STA提供了发送机会。因此，无线局域网的吞吐量通过减少竞争开销（例如空闲的后退时隙和冲突）而增加。为了评估CDR方法的性能，已进行了分析评估和模拟。