Hybrid Cellular-Ad hoc Data Network Shuai Zhang, Ziwen Zhang, Jikai Yin.

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Presentation transcript:

Hybrid Cellular-Ad hoc Data Network Shuai Zhang, Ziwen Zhang, Jikai Yin

Outline Overview Scenario Technique

Overview Capacity of Hybrid Cellular-Ad hoc Data Networks

The hybrid network in brief

Infrastructure component Reduced cellular coverage (dark hexagon). User receive downlink traffic directly from the Base Station (BS). The transmission efficiency of the BS enhanced

Ad hoc component Users that are outside the reduced cellular coverage require proxies The directly connected users act as proxies and forward traffics from BS Only a subset of outside users may directly receive traffic from proxies. These users act as relays and forward traffic to other users that are further away from BS

Scenario Massive Live Video Distribution using Hybrid Cellular and Ad hoc Networks

Motivation Today, cellular networks are unable to handle large scale live video distributions since existing cellular deployments do not natively support multicast and broadcast. Cellular service providers solutions, such as support Multimedia Broadcast Multicast Service (MBMS) or build dedicated broadcast networks, incur high infrastructure costs and may not be compatible with current mobile devices. A better solution: Cellular service providers may offload mobile video traffic to an auxiliary network. Mobile devices relay video data among each other using ad hoc links.

System Architecture A hybrid cellular and ad hoc network Consist of a base station and multiple mobile devices Mobile devices relay video data among each other using ad hoc links

Problem

Scheduling

Solution An MILP-based algorithm POPT  the formulation above is an MILP problem and may be solved by MILP solvers.  NP-Complete, POST algorithm may not scale well with the number of mobile devices. A heuristic algorithm MTS  first probes the maximum feasible ad hoc network capacity based on transmission unit availability.  then greedily schedules transmission units until the ad hoc and cellular network capacities are both saturated.

Conclusion Optimally leverage an auxiliary ad hoc network to boost the overall video quality of mobile users in a cellular network. Formulated the problem as an MILP problem to jointly solve the gateway selection, ad hoc routing, and video adaptation problems for a global optimum schedule.

Technique Wi-Fi Direct, also called Wi-Fi P2P

Definition Wi-Fi Direct, initially called Wi-Fi P2P, is a Wi-Fi standard that enable devices to connect easily with each other Without requiring a wireless access point Communicate at typical Wi-Fi speeds for both file transfer to internet connectivity.

Implementation Wi-Fi peer to peer allows Android 4.0 or later devices with the appropriate hardware to connect directly to each other via Wi-Fi without an intermediate access point. Wi-Fi P2P APIs consist of three main parts:  Methods that allow to discover, request, and connect to peers  Listeners that allow to be notified of the success or failure of method calls  Intents that notify of specific event detected by the Wi-Fi P2P framework, such as a dropped connection and a newly discovered peer

Thanks