The communication system 100 also includes at least one terminal device 120 located within the coverage area of the network device 110. As used herein, “terminal device” includes, but is not limited to, being connected via wired lines, for example, being connected via public switched telephone networks (PSTN), digital subscriber line (DSL), digital cable, direct cable; and/or another data connection/network; and/or via a wireless interface, such as for cellular networks, wireless local area networks (WLAN), digital television networks such as DVB-H networks, satellite networks, AM-FM broadcast transmitters; and/or another terminal device that is set to receive/transmit communication signals; and/or Internet of things (IoT) equipment. A terminal device set to communicate through a wireless interface may be referred to as a “wireless communication terminal”, a “wireless terminal” or a “mobile terminal”. Examples of mobile terminals include, but are not limited to, satellite or cellular phones; personal communications system (PCS) terminals that may combine cellular radio phones with data processing, fax, and data communication capabilities; PDAs that may include radio telephones, pagers, Internet/Intranet access, Web browsers, note pads, calendars, and/or global positioning system (GPS) receivers; and conventional laptops and/or handheld receivers or other electronic devices including radio telephone transceivers. The terminal device may refer to an access terminal, a user equipment (UE), a user unit, a user station, a mobile console, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication equipment, a user agent, or a user device. The access terminal may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication functions, a computing device or other processing devices connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in the 5G network, or a terminal device in the future evolved PLMN, etc.