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The advent of HTML5 Hyper Text Markup Language revision 5 technologies are re-standardizing the web and paving the way for a new breed of real-time web applications This has great potential for mobile browsers that are now supporting protocols such as WebSocket and Server-Sent Events SSE These protocols can provide ecient real-time communication in a scalable manner especially for always-on applications requiring persistent connections that are now widely used Mobile devices are inherently restricted due to their limited battery power and require frequent charging Therefore experimentation that potentially promotes breakthroughs in mobile energy eciency is useful at this time Extensive measurements were conducted over 3G 4G and WiFi networks to analyze the performance of WebSocket and SSE across a variety of popular mobile devices browsers and platforms Devices were connected to a power monitor for a precise understanding of the energetic effects of keep-alive mechanisms and their overall effects on long-lasting connectivity The results reveal that application level keep-alive mechanisms are not necessary to sustain the connections indefinitely given proper server and network congurations However to avoid timeouts and to detect prematurely disconnected clients keep-alive exchanges are necessary and useful in practice The effects of short and long keep-alive interval values are examined in detail for all devices Browser performance varies widely as no browser was completely successful for both WebSocket and SSE tests Further improvements in mobile browser support for these technologies will be necessary to reach the full potential of real-time applications in the future Tillkomsten av HTML5 Hyper Text Markup Language revision 5 teknik r ter standardisera webben och bana v g f r en ny typ av realtid webbapplikationer Detta har stor potential f r mobila webbl sare som nu st djer protokoll s som WebSocket och Server-Sent Events SSE Dessa protokoll kan ge effektiv kommunikation i realtid p ett skalbart s tt s rskilt f r alltid-p applikationer som kr ver best ndiga anslutningar som nu anv nds i stor utstr ckning Mobila enheter r i sig begr nsade p grund av deras begr nsade batteri och kr ver frekvent laddning D rf r r experiment som potentiellt fr mjar genombrott i mobil energie ektivitet anv ndbar vid denna tid Omfattande m tningar utf rdes ver 3G 4G och WiFi-n tverk f r att analysera resultatet for Web-Socket och SSE ver en variation av popul ra mobila enheter webbl sare och plattformar Enheter var ansluten till en monitor f r en exakt f rst else av de energiska effekter keep-alive-mekanismer och deras samlade effekter p l ngvarig anslutning Resultaten visar att applikationsniv keep-alive-mekanismerna r inte n dv ndigt att uppr tth lla anslutningarna p obest md tid ges r tt server och konfigurationer n tverk Men f r att undvika timeout och att uppt cka tidigt fr nkopplade klienter keep-alive-b rser r n dv ndiga och anv ndbara i praktiken Effekterna av korta och l nga keep-alive intervallv rdena granskas i detalj f r alla enheter Browser prestanda varierar kraftigt eftersom ingen webbl sare var helt lyckat f r b de WebSocket och SSE tester Ytterligare f rb ttringar av mobila webbl sare st d f r denna teknik kommer att vara n dv ndigt f r att uppn den fulla potentialen av realtidsapplikationer i framtiden

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Mobile HTML5: Efficiency and Performance of WebSockets and Server-Sent Events

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