An embodiment of the disclosure also provides a computer program product. The computer program product includes a non-transitory computer-readable storage medium storing a computer program. The computer program may be operated to enable a computer to execute part or all of the operations executed by the network-side device in, for example, the abovementioned methods. The computer program product may be a software installation package.

The operations of the method or algorithm described in the embodiments of the disclosure may be implemented in a hardware manner, and may also be implemented in a manner of executing, by a processor, software. A software instruction may consist of a corresponding software module, and the software module may be stored in a RAM, a flash memory, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a register, a hard disk, a mobile hard disk, a Compact Disc-ROM (CD-ROM) or a storage medium in any other form well known in the field. An exemplary storage medium is coupled to the processor, thereby enabling the processor to read information from the storage medium and write information into the storage medium. Of course, the storage medium may also be a component of the processor. The processor and the storage medium may be located in an ASIC. In addition, the ASIC may be located in an access network device, a target network device or a core network device. Of course, the processor and the storage medium may also exist in the access network device, the target network device or the core network device as discrete components.