Wi-Fi 6 přichází. Sítě budou rychlejší a připojí se k nim více lidí

17. 9. 2019

Sdílet

Wi-Fi Alliance včera oznámila, že začala certifikovat zařízení s podporou nové generace bezdrátových sítí. Ty se budou nazývat Wi-Fi 6 (zpětně se přejmenovaly i starší verze) a budou postaveny na novém standardu IEEE 802.11ax. Nástupce 802.11ac sice ještě pořád nemá finální specifikace (budou zřejmě do konce roku), ale výrobci síťových prvků již uvádějí první kompatibilní výrobky. AX přináší zásadní zlepšení ve třech oblastech. Nabídne vyšší rychlosti, kapacitu pro více připojených uživatelů, je bezpečnější a energeticky úspornější. Co je tedy nového?

Hlavní novinky Wi-Fi 6 (802.11ax)

Po jednogenerační pauze bude Wi-Fi 6 běžet nejen v pásmu 5 GHz, ale také 2,4 GHz. Největší přínos ale pochopitelně bude mít v tom prvním, kde půjde využít až 160 MHz široké kanály. To spolu s efektivnější modulací 1024-QAM a zvýšením počtu MIMO streamů na 8 umožňuje dosáhnout maximální teoretické propustnosti až 9,6 Gb/s. Skoro trojnásobek oproti Wi-Fi 5.

Wi-Fi 6 nově podporuje modulační schéma OFDMA používané u LTE a 5G pro zvýšení kapacity sítě. Najednou bude moci přes Wi-Fi komunikovat více zařízení současně. Víceanténový systém MU-MIMO se nově uplatní i u uploadu. Energetická spotřeba je až o dvě třetiny nižší než u Wi-Fi 5. Síť navíc počítá s funkcí Target wake time (TWT), což je takový chytrý plánovač probouzení a uspávání pro IoT zařízení.

Nová generace již v základu podporuje beamforming pro přesné směrování signálu z routeru do připojených zařízení. Prvky certifikované pro Wi-Fi 6 si také budou muset poradit s novým zabezpečovacím protokolem WPA3.

linux_sprava_tip

Na trhu již najdeme několik routerů s podporou 802.11ax, letos přišly též první kompatibilní mobily. Primát drží Samsung Galaxy S10 (recenze), později se přidal i Note 10 (recenze) nebo čerstvě iPhone 11.

Srovnání Wi-Fi
Wi-Fi 1 Wi-Fi 2 Wi-Fi 3 Wi-Fi 4 Wi-Fi 5 Wi-Fi 6
šířka kanálů až 20 MHz 20 MHz až 20 MHz až 40 MHz až 160 MHz až 160 MHz
pásmo 5 GHz 2,4 GHz 2,4 GHz 2,4 + 5 GHz 5 GHz 2,4 + 5 GHz
počet streamů 1 1 1 4 4 8
nejvyšší modulace 64-QAM 64-QAM 64-QAM 64-QAM 256-QAM 1024-QAM
max. propustnost 54 Mb/s 11 Mb/s 54 Mb/s 600 Mb/s 3,5 Gb/s 9,6 Gb/s
standard 802.11a 802.11b 802.11g 802.11n 802.11ac 802.11ax

Zdroj: Wi-Fi

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This helps the SDK to // select the correct creative if multiple are returned. // adsRequest.linearAdSlotWidth = outstreamWidth; // adsRequest.linearAdSlotHeight = outstreamHeight; adsRequest.nonLinearAdSlotWidth = 0; adsRequest.nonLinearAdSlotHeight = 0; adsLoader.requestAds(adsRequest); } function setupReplayScreen() { replayScreen.addEventListener('click', function () { iinfoOutstreamPosition.remove(); iinfoVastUrlIndex = 0; outstreamInit(); }); } /** * Sets the 'adContainer' div as the IMA ad display container. */ function createAdDisplayContainer() { // We assume the adContainer is the DOM id of the element that will house // the ads. outstreamDocument.getElementById('videoContent').style.display = 'none'; adDisplayContainer = new google.ima.AdDisplayContainer( outstreamDocument.getElementById('adContainer'), videoContent); } function unmuteAdvert() { adVolume = !adVolume; if (adVolume) { adsManager.setVolume(0.3); outstreamDocument.getElementById('adMuteBtn').innerHTML = ''; } else { adsManager.setVolume(0); outstreamDocument.getElementById('adMuteBtn').innerHTML = ''; } } /** * Loads the video content and initializes IMA ad playback. */ function playAds() { // Initialize the container. Must be done through a user action on mobile // devices. videoContent.load(); adDisplayContainer.initialize(); // setupDimensions(); try { // Initialize the ads manager. Ad rules playlist will start at this time. adsManager.init(1920, 1080, google.ima.ViewMode.NORMAL); // Call play to start showing the ad. Single video and overlay ads will // start at this time; the call will be ignored for ad rules. adsManager.start(); // window.addEventListener('resize', function (event) { // if (adsManager) { // setupDimensions(); // adsManager.resize(outstreamWidth, outstreamHeight, google.ima.ViewMode.NORMAL); // } // }); } catch (adError) { // An error may be thrown if there was a problem with the VAST response. // videoContent.play(); } } /** * Handles the ad manager loading and sets ad event listeners. * @param { !google.ima.AdsManagerLoadedEvent } adsManagerLoadedEvent */ function onAdsManagerLoaded(adsManagerLoadedEvent) { // Get the ads manager. const adsRenderingSettings = new google.ima.AdsRenderingSettings(); adsRenderingSettings.restoreCustomPlaybackStateOnAdBreakComplete = true; adsRenderingSettings.loadVideoTimeout = 12000; // videoContent should be set to the content video element. adsManager = adsManagerLoadedEvent.getAdsManager(videoContent, adsRenderingSettings); // Add listeners to the required events. adsManager.addEventListener(google.ima.AdErrorEvent.Type.AD_ERROR, onAdError); adsManager.addEventListener( google.ima.AdEvent.Type.CONTENT_PAUSE_REQUESTED, onContentPauseRequested); adsManager.addEventListener( google.ima.AdEvent.Type.CONTENT_RESUME_REQUESTED, onContentResumeRequested); adsManager.addEventListener( google.ima.AdEvent.Type.ALL_ADS_COMPLETED, onAdEvent); // Listen to any additional events, if necessary. adsManager.addEventListener(google.ima.AdEvent.Type.LOADED, onAdEvent); adsManager.addEventListener(google.ima.AdEvent.Type.STARTED, onAdEvent); adsManager.addEventListener(google.ima.AdEvent.Type.COMPLETE, onAdEvent); playAds(); } /** * Handles actions taken in response to ad events. * @param { !google.ima.AdEvent } adEvent */ function onAdEvent(adEvent) { // Retrieve the ad from the event. Some events (for example, // ALL_ADS_COMPLETED) don't have ad object associated. const ad = adEvent.getAd(); console.log('Outstream event: ' + adEvent.type); switch (adEvent.type) { case google.ima.AdEvent.Type.LOADED: // This is the first event sent for an ad - it is possible to // determine whether the ad is a video ad or an overlay. if (!ad.isLinear()) { // Position AdDisplayContainer correctly for overlay. // Use ad.width and ad.height. videoContent.play(); } outstreamDocument.getElementById('adContainer').style.width = '100%'; outstreamDocument.getElementById('adContainer').style.maxWidth = '640px'; outstreamDocument.getElementById('adContainer').style.height = '360px'; break; case google.ima.AdEvent.Type.STARTED: window.addEventListener('scroll', onActiveView); // This event indicates the ad has started - the video player // can adjust the UI, for example display a pause button and // remaining time. if (ad.isLinear()) { // For a linear ad, a timer can be started to poll for // the remaining time. intervalTimer = setInterval( function () { // Example: const remainingTime = adsManager.getRemainingTime(); // adsManager.pause(); }, 300); // every 300ms } outstreamDocument.getElementById('adMuteBtn').style.display = 'block'; break; case google.ima.AdEvent.Type.ALL_ADS_COMPLETED: if (ad.isLinear()) { clearInterval(intervalTimer); } if (outstreamLastError === 303) { if (isBanner) { renderBanner(); } else { replayScreen.style.display = 'flex'; } } break; case google.ima.AdEvent.Type.COMPLETE: // This event indicates the ad has finished - the video player // can perform appropriate UI actions, such as removing the timer for // remaining time detection. if (ad.isLinear()) { clearInterval(intervalTimer); } if (isBanner) { renderBanner(); } else { replayScreen.style.display = 'flex'; } break; } } /** * Handles ad errors. * @param { !google.ima.AdErrorEvent } adErrorEvent */ function onAdError(adErrorEvent) { // Handle the error logging. console.log(adErrorEvent.getError()); outstreamLastError = adErrorEvent.getError().getErrorCode(); if (!loadNext()) { renderBanner(); } } function renderBanner() { if (isBanner) { console.log('Outstream: Render Banner'); iinfoOutstreamPosition.innerHTML = ""; iinfoOutstreamPosition.style.height = "330px"; iinfoOutstreamPosition.appendChild(bannerDiv); } else { console.log('Outstream: Banner is not set'); } } function loadNext() { iinfoVastUrlIndex++; if (iinfoVastUrlIndex < iinfoVastUrls.length) { iinfoOutstreamPosition.remove(); outstreamInit(); } else { return false; } adVolume = 1; return true; } /** * Pauses video content and sets up ad UI. */ function onContentPauseRequested() { videoContent.pause(); // This function is where you should setup UI for showing ads (for example, // display ad timer countdown, disable seeking and more.) // setupUIForAds(); } /** * Resumes video content and removes ad UI. */ function onContentResumeRequested() { videoContent.play(); // This function is where you should ensure that your UI is ready // to play content. It is the responsibility of the Publisher to // implement this function when necessary. // setupUIForContent(); } function onActiveView() { if (outstreamContainer) { const containerOffset = outstreamContainer.getBoundingClientRect(); const windowHeight = window.innerHeight; if (containerOffset.top < windowHeight/1 && containerOffset.bottom > 0.0) { if (outstreamPaused) { adsManager.resume(); outstreamPaused = false; } return true; } else { if (!outstreamPaused) { adsManager.pause(); outstreamPaused = true; } } } return false; } let outstreamInitInterval; if (typeof cpexPackage !== "undefined") { outstreamInitInterval = setInterval(tryToInitializeOutstream, 100); } else { const wrapper = getWrapper(); if (wrapper) { let outstreamInitialized = false; window.addEventListener('scroll', () => { if (!outstreamInitialized) { const containerOffset = wrapper.getBoundingClientRect(); const windowHeight = window.innerHeight; if (containerOffset.top < windowHeight / 1 && containerOffset.bottom > 0.0) { outstreamInit(); outstreamInitialized = true; } } }); } } function tryToInitializeOutstream() { const wrapper = getWrapper(); if (wrapper) { const containerOffset = wrapper.getBoundingClientRect(); const windowHeight = window.innerHeight; if (containerOffset.top < windowHeight / 1 && containerOffset.bottom > 0.0) { if (cpexPackage.adserver.displayed) { clearInterval(outstreamInitInterval); outstreamInit(); } } } else { clearInterval(outstreamInitInterval); } } }
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