A consolidated power saving architecture accommodating push-type applications for dual-mode devices

Dual-mode devices, that have multiple network interfaces, have recently attracted both users and operators. Users are enabled to enjoy rich contents via high-speed and low-cost WLAN access. On the other hand, data offloading to WLAN network reduces operators´ equipment cost for network infrastructure. However, a WLAN interface consumes much power even in the power save mode so that dual-mode devices would be totally unsatisfactory to users. This paper presents a consolidated solution available to many push applications to achieve “deep-sleep mode” in which WLAN interface is switched off as much as possible if not used. Application servers notify the dual-mode device of the event generation (e.g. receiving an incoming call, arriving an email, etc.). Receiving the notification, the dual-mode device activates WLAN interface and communicates with the application servers. We also implemented a prototype system, and experimental results show our method can reduce total power consumption.