This demo paper presents a dApp-based real-time spectrum sharing scenario where a 5th generation (5G) base station implementing the NR stack adapts its transmission and reception strategies based on the incumbent priority users in the Citizen Broadband Radio Service (CBRS) band. The dApp is responsible for obtaining relevant measurements from the Next Generation Node Base (gNB), running the spectrum sensing inference, and configuring the gNB with a control action upon detecting the primary incumbent user transmissions. This approach is built on dApps, which extend the O-RAN framework to the real-time and user plane domains. Thus, it avoids the need of dedicated Spectrum Access Systems (SASs) in the CBRS band. The demonstration setup is based on the open-source 5G OpenAirInterface (OAI) framework, where we have implemented a dApp interfaced with a gNB and communicating with a Commercial Off-the-Shelf (COTS) User Equipment (UE) in an over-the-air wireless environment. When an incumbent user has active transmission, the dApp will detect and inform the primary user presence to the gNB. The dApps will also enforce a control policy that adapts the scheduling and transmission policy of the Radio Access Network (RAN). This demo provides valuable insights into the potential of using dApp-based spectrum sensing with O-RAN architecture in next generation cellular networks.

翻译：本演示论文提出一种基于去中心化应用（dApp）的实时频谱共享方案，其中部署新空口（NR）协议的第五代（5G）基站可根据公民宽带无线电服务（CBRS）频段中优先占用用户的情况动态调整收发策略。该dApp负责从下一代基站（gNB）获取相关测量数据，执行频谱感知推理，并在检测到主要占用用户传输时通过控制指令配置gNB。该方法基于dApp构建，将O-RAN框架扩展至实时域与用户平面域，从而避免在CBRS频段部署专用频谱接入系统（SAS）。演示平台基于开源5G OpenAirInterface（OAI）框架实现，我们开发了与gNB对接的dApp，并在空口无线环境中与商用现成（COTS）用户设备（UE）进行通信。当占用用户存在活跃传输时，dApp将检测并向gNB通告主用户存在状态，同时执行控制策略以自适应调整无线接入网（RAN）的调度与传输机制。本演示为下一代蜂窝网络中采用基于dApp的频谱感知与O-RAN架构融合的潜力提供了重要实践参考。