Abstract: A method, a device, and a system for controlling quality of service are provided. The method includes: obtaining, by a policy and charging enforcement function PCEF entity, a service flow priority identifier (FPI) of a downlink data packet, where the FPI is used to indicate a priority of a service flow to which the downlink data packet belongs; carrying, by the PCEF, the FPI in the downlink data packet; and sending, by the PCEF, the downlink data packet to a base station, so that the base station sends the downlink data packet to a user equipment UE according to the FPI. By adopting the method, the device, and the system according to the embodiments of the present invention, end-to-end differentiated processing of a service flow can be implemented, differentiated experiences can be provided for different levels of subscribers and different types of services.

Abstract: The embodiments of the present invention provide a method and a trusted gateway for a WiFi terminal to access a PS service domain. The method comprises: receiving an accounting request message sent by an authentication, authorization and accounting AAA server or a dynamic host configuration protocol DHCP request message sent by the WiFi terminal; establishing, by a trusted gateway, a first packet data protocol PDP context connection or a first packet data network PDN connection with the PS service domain according to attribute information of the WiFi terminal after receiving the accounting request message or the DHCP request message, so that the WiFi terminal accesses the PS service domain via the wireless local area network, the trusted gateway, and the established first PDP context connection or the first PDN connection.

Abstract: The embodiments of the present invention provide a method and a trusted gateway for a WiFi terminal to access a PS service domain. The method comprises: receiving an accounting request message sent by an authentication, authorization and accounting AAA server or a dynamic host configuration protocol DHCP request message sent by the WiFi terminal; establishing, by a trusted gateway, a first packet data protocol PDP context connection or a first packet data network PDN connection with the PS service domain according to attribute information of the WiFi terminal after receiving the accounting request message or the DHCP request message, so that the WiFi terminal accesses the PS service domain via the wireless local area network, the trusted gateway, and the established first PDP context connection or the first PDN connection.

Abstract: A method, a device, and a system for controlling quality of service are provided. The method includes: obtaining, by a policy and charging enforcement function PCEF entity, a service flow priority identifier (FPI) of a downlink data packet, where the FPI is used to indicate a priority of a service flow to which the downlink data packet belongs; carrying, by the PCEF, the FPI in the downlink data packet; and sending, by the PCEF, the downlink data packet to a base station, so that the base station sends the downlink data packet to a user equipment UE according to the FPI. By adopting the method, the device, and the system according to the embodiments of the present invention, end-to-end differentiated processing of a service flow can be implemented, differentiated experiences can be provided for different levels of subscribers and different types of services.

Abstract: Embodiments of the present invention disclose a gateway selection method for heterogeneous networks, where the method includes: accessing, by a terminal, an access network 1; obtaining, by the terminal, an equipment identity of a core network element 1; accessing, by the terminal, an access network 2, where the access network 2 and the access network 1 are heterogeneous networks; and sending, by the terminal, the obtained equipment identity of the core network element 1 to a core network element 2, and if an equipment identity of the core network element 2 is different from the equipment identity of the core network element 1, selecting the core network element 1 as a target gateway. Accordingly, the embodiments of the present invention further provide a terminal, a core network element, and a communication system.

Abstract: Embodiments of the present invention disclose a gateway selection method for heterogeneous networks, where the method includes: accessing, by a terminal, an access network 1; obtaining, by the terminal, an equipment identity of a core network element 1; accessing, by the terminal, an access network 2, where the access network 2 and the access network 1 are heterogeneous networks; and sending, by the terminal, the obtained equipment identity of the core network element 1 to a core network element 2, and if an equipment identity of the core network element 2 is different from the equipment identity of the core network element 1, selecting the core network element 1 as a target gateway. Accordingly, the embodiments of the present invention further provide a terminal, a core network element, and a communication system.