A main application scenario of this application is shown in FIG. 3, and may include an access network device and a terminal.

The access network device may be an evolved NodeB (referred to as an eNB or an eNodeB for short), a macro base station, a micro base station (also referred to as a “small cell”), a picocell base station, an access point (AP), a transmission point (TP), a gNodeB (new generation NodeB), or the like in a long term evolution (LTE) system, a new radio (NR) system, or an licensed-assisted access long-term evolution (LAA-LTE) system in a radio access network (RAN).

The terminal may be referred to as a terminal device (UE), a mobile station (MS), a mobile terminal, an intelligent terminal, or the like. The terminal device may communicate with one or more core network devices through the radio access network. For example, the terminal devices may be mobile phones (or referred to as “cellular” phones), or computers with mobile terminals. The terminal devices may alternatively be portable, pocket-size, handheld, computer built-in, or in-vehicle mobile apparatuses, and terminal devices in a future NR network. The terminal devices exchange voice or data with the radio access network. A description of the terminal device is provided as follows: In this application, the terminal device may further include a relay, and a device that can perform data communication with a base station is considered as a terminal device.