## 1 Introduction  
The rapid advancement of information and communications technology (ICT) causes the data exchange paradigm to evolve, from human-to-human (H2M) to human-to-machine (H2M), and even to machine-to-machine (M2M) [1]. Correspondingly, the latency requirement is also getting higher. This very low-latency communication gives rise to the tactile internet [2; 3]. The tactile is considered the next evolution of the Internet of Things (IoT), supporting the real-time haptic data transmission (e.g., touch, action) for the remote object/machine control. For the tactile internet, low-latency, accurate, and collaborative human-agent-robot teamwork (HART) is important. The tactile internet involves enormous, wide-area-distributed sensors/machines. Wire and wireless access networks are essential [4]. The fiber-wireless (FiWi) network is one of them, as shown in Figure 1, which integrates the wired fiber backhaul and wireless fronthaul. In the wired fiber backhaul, a tree-like topology with the IEEE 802.3 ah/av 1/10 G passive optical network (PON) protocol that connects the central optical line terminal (OLT) to four optical network units (ONUs) is adopted. To provide fiber-to-the-home/building/road (FTTx) services to fixed subscribers, an ONU is located at subscriber communities (i.e., the first sub-network). This fixed method is not relevant to the main content of this work. The second sub-network is equipped with a based station (BS)-aided ONU (i.e., ONU-BS). The mesh portal point (MPP)-aided ONU (ONU-MPP), the mesh point (MP), and the mesh access point (MAP), are deployed to host IoT services in the third sub-network. Note that multi-access edge computing (MEC) can be used on ONUs. Finally, some computing-centric tasks can be offloaded onto MEC for the tactile services. This scenario forms the background of our work. As the physical underlying infrastructure of the tactile internet, the FiWi network has attracted much attention. An efficient FiWi network means good support of the tactile internet service. The efficient indicator can be latency, throughput, energy consumption, etc. The seamless integration of wired fiber backhaul and wireless fronthaul is the key issue. Surrounding this issue, the energy-efficient frame aggregation [5], throughput optimization [6], and medium access control (MAC) protocol design [7] were conducted. These three works focused on the improvement of the FiWi network's performance, neglecting the uniqueness of the tactile internet. The tactile internet is a kind of network that can transfer not only pictures and voice, but also touch, sense, scent, etc. Human experience, service data, and tactile internet are interact with each other online and with feedback, through joysticks, digital gloves, robots, augmented reality (AR)/virtual reality (VR)/mixed reality (MR), and other instruments. The online interaction in this instance is that a man can operate a remoted object without any latency or the sense of lag. The increase in service data dimensions (sych as pictures, voice, touch sense, etc.) leads to an increase in the amount of data in tactile services. The tactile internet has a latency requirement of 1-10 milliseconds, which is much more demanding than current networks. HART empowers humans with artificial intelligence (AI) based on agile computing. The tactile internet complement humans rather than providing a substitute for them [8]. The human is a member of HART, not just a conventional user. For the tactile internet, its characteristics of low latency, enormous access, heterogeneity, and intelligence, are in line with the evolution direction beyond 5 th generation (B5G)/6 th generation (6G) communications. MEC is a promising way to reduce latency by physically or logically moving data-centric computing to the infrastructure for the near-end user [9]. By 2025, the number of connected IoT devices will be 41.6 billion. They will generate 79.4 zettabytes of data for computing [10].