Middleware Framework for Disconnection Tolerant Mobile Application Services

1. Middleware Framework for Disconnection Tolerant Mobile Application Services Access network (Wireless) Core network (Wired) Global IP network (Wired) Server-3 Services Services Application Server-2 Services Server-1 Middleware Middleware Services Mobile device Servers Mobile Intelligent server R S R S Send Buffer Receive Buffer Sending Buffer Receiving Buffer BS_1 BS_2 User’s path (d) (c) (b) (a) Starting point for getting a signal strength from BS_1 Ending point for getting a signal strength from BS_1 Starting point for getting a signal strength from BS_2 Ending point for getting a signal strength from BS_2 BS : Base Station Consider disconnection tolerant mobile application services Prepare losing the connection Recover network connection, Resume mobile application service Signal Strength (d) (c) (b) (a) User’s movement Sangwhan Cha, Weichang Du,.Bernd J. Kurz Introduction Middleware Framework Design Mobile services are prone to failures caused by the disruption of an active wireless access network connection due to the user’s movement to other networks or signal blocking (shadowing). Thus, proper mechanisms for disconnection tolerant mobile application services are needed. we propose a middleware framework that transparently performs required functionality for users in order to provide continuous mobile services in case of network disruption. Such middleware framework provides an effective disconnection tolerant mobile application service. SM : Service Manager CM : Connection Manager RM : Resource Manager CH : Context Handler Mobile Intelligent Server Mobile Device Keeping the mobile service run Play the mobile service Control service :SM :CH Analyze context Control connection Obtain the service type :CM :SM --Refer the policy Control context :CH Monitor the SS :SM Readjust mobile service :CM Control resource :RM :CM Detect the SS weaker Recovering the network connection Preparing the connection lost Server :RM :SM Reserve more data Restore service state Provide mobile services :SM Save service state :SM Resume mobile service Research Problem :CM Communication Detect other networks Solution MIS is located in the fixed network and has reliable connections to the application server. Figures shows a network disruption between base station 1 and base station 2 when a mobile device moves from point (a) to point (d). Thus, mobile multimedia application services cannot be provided properly during network disconnection from point (b) to point (c). When the disruption in the access network occurs, the middleware on the mobile device will try to make the mobile application run as long as possible with limited resources until reconnection, Real-World Applications • Current Existing Applications • Stored multimedia • : Mobile VOD, Mobile IPTV • Real time Multimedia • : Mobile Video Call • : Mobile Conference • : Mobile streaming multimedia • (Watch child care, Watch house • ,…etc.) • Others • : Mobile Game, • : VR (Virtual Reality) application • : Etc. • Future Applications • Real time Multimedia : Mobile Cloud computing • Virtual Reality (VR) :Mobile Training :Mobile Education :Mobile Medical Application :Mobile E-Commerce :Mobile Entertainment :Mobile Manufacturing Appropriate mechanisms are needed for preparing a persistent and resumable mobile service before the current wireless access network is lost, making sure that a mobile application continues to run on the mobile device, until reconnection occurs through another detected wireless network, and recovering the execution of the mobile service after the wireless access network reconnection. Middleware Architecture Overview Service Application Service SM : Service Manager CH : Context Handler CM : Connection Manager RM : Resource Manager Middleware SM CH SM CH Data CM CM RM RM • For more information, Refer to the paper : S. Cha, W. Du, and B. Kurz, “Middleware framework for disconnection tolerant mobile application services” in proceedings of the 10th communication networks and services research conference (CNSR 2010), Montreal, May, 2010. Vendor Platform Vendor Platform Vendor Platform Hardware Resource Hardware Resource Hardware Resource Mobile Device Mobile Intelligent Server Sever Communication Networks and Services Research (CNSR) This research is supported and funded through CNSR by Bell / Aliant and ACOA by an AIF research contract.