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Nearby: Hybrid Network Mobile Application

This paper discusses a hybrid network mobile application system architecture designed to provide broadcast services that extend to end users even when some lack direct connectivity to the base station. The central broker utilizes a scheduling algorithm to offer maximum coverage and allows users to communicate through ad-hoc methods with the help of nearby devices using Wi-Fi Direct technology. The system involves user location reporting, dynamic user selection, and message relaying, ensuring a comprehensive connectivity solution in coverage gaps.

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Nearby: Hybrid Network Mobile Application

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  1. Shuai Zhang, Ziwen Zhang, Jikai Yin Nearby: Hybrid Network Mobile Application

  2. System Architecture Thegoalofoursystemistoprovidebroadcastservicethatcoversasmanyendusersinthebasestationoriginalcoveragewhensomeoftheusersdonothavedirectconnectivitytothebasestation. Enduser CentralbrokerandBaseStation

  3. Howdoesthissystemwork? Locationdatabase Centralbrokerwillknowtheareatheuser4anduser5usedtobeinareoutofcoverage. User4anduser5canreporttheirlocationinformationtothecentralbrokewiththehelpofothernearbyusers. Centralserverwillchooseuserswhoareclosetothedisconnectedareaandaskthemtousead-hoctechniquestodiscoverandsendmessagetotheusersinthatarea. Theareacannowbefullycoveredagain.User4anduser5willreceivebroadcastmessageswithanintermediateuserrelaying. User1location1updateTime User2location2updateTime User3 location3 updateTime User4location4updateTime user2 User5location5updateTime User6location6updateTime user3 User7location7updateTime user1 Disconnectedarea user4 user7 user5 user6

  4. Two main parts of implementation • Theschedulingalgorithmrunninginsidethecentralbrokethataimstoprovidebroadcastcoverageashighaspossible. • Thetechniquethatenablesenduserstotalktoeachotherwithoutinfrastructure.

  5. WifiDirect– solution to mobilead-hoc • 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. • 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.

  6. Broker scheduling: Max-Flow Algorithm

  7. Implement • Location-based Service Application • Interfaces: Location Nearby and Wi-Fi P2P Nearby. • MySQL and PHP on back-end server • Android on front-end Mobile Phone • Google Map API v2 and Wi-Fi P2P service.

  8. Location Nearby

  9. Wifi-P2P Nearby

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