Abstract: A fan includes an air cylinder and an air outlet hood. An interior of the air cylinder is hollow to form a hollow cavity. The air cylinder has an air inlet and an air outlet. The air outlet hood is detachably disposed on the air outlet. The air outlet hood is provided with an annular air outlet for air outlet. An outer ring and/or an inner ring of the annular air outlet is formed with an annular guide rib extending toward the air inlet. The annular guide rib is configured to make an airflow cross section adjacent to the annular air outlet gradually decrease, so as to make an airflow in the air outlet hood cohesive, thereby increasing an air outlet speed of the annular air outlet. A hair dryer having the fan is also disclosed.

Abstract: Embodiments of this invention relate to methods and apparatus for establishing additional simultaneous packet data network (PDN) connections between a User Equipment (UE) and an evolved packet core network (EPC) over an untrusted WiFi network. The UE is attached to the EPC through a security gateway over a first PDN connection over which the UE is authenticated and has established an Internet Key Exchange Security Association (IKE SA) and a first Internet Protocol Security SA (IPSec SA). The UE then establishes an additional PDN connection using a new IKE request/response exchange or an enhanced IKE CREATE_CHILD_SA exchange that is cryptographically protected using algorithms and keys negotiated during the first PDN connection, hence improving delay and battery life of the UE as the UE no longer needs, for each additional PDN connection, to negotiate an individual IKE SA and to authenticate the UE.

Abstract: Embodiments of this invention relates to methods, and apparatus for establishing additional simultaneous packet data network, PDN, connections between a User Equipment, UE, and the evolved packet core network, EPC, over an untrusted WiFi network. The UE is attached to the EPC through a security gateway over a first PDN connection over which the UE is authenticated and has established an IKE Security Association, SA and a first IPSec SA. The UE then establishes an additional PDN connection using a new IKE request/response exchange or an enhanced IKE CREATE_CHILD_SA exchange that is cryptographically protected using the algorithms and keys negotiated during the first PDN connection, hence improving the delay and the UE battery life as the UE no longer needs, for each additional PDN connection, to negotiate an individual IKE SA and to authenticate the UE.