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計概
1.
蜂巢式無線電 3G &
4G & APP 組員:周禹辰-----31 張嘉均-----40
2.
簡單說蜂巢式網路就是將有限的無線電波頻段作更 有效的利用,就像下圖所示,將同一頻段的訊號分 開覆蓋至有相同距離的區域 蜂巢式無線電
3.
我們的移動通訊標準從1G 2G
3G 到現在的4G 其中1G 及2G網路最主要的分別是1G使用類比調制,而2G則 是數位調制。大多數只能支援語音傳輸,少數的2G 系統(2.5G)能支援檔案傳輸但速度緩慢只能發發 Email。 3G and 4G
4.
到了新一代的3G蜂巢式網路就有了明顯的躍進能夠處理影 像、音樂、視訊形式,提供網頁瀏覽、電話會議、電子商 務資訊服務。而通訊品質本身相較於2G、2.5G也有了很大 的提升。3G網路的傳輸速度能達到300K~2Mbps,而有些 3.5G系統更能達到下載14Mbps 上傳5.8Mbps。 3G
and 4G
5.
而現下最新的4G網路技術理論上與先前的3G技術相比可以 說是天與地的差別,4G網路在靜止或慢速移動下的傳輸速 度可達到1Gbps;高速移動狀態下則可以到100Mbps,但這 只是所訂的標準值,現在所發布的第一版本4G LTE
的傳輸 速度遠小於1Gbps(例如:台灣最近推行的4G網路經過實測下 載速度66Mbps上傳20Mbps,但他們還是被稱為4G,必盡 它們是先驅者XDD)。 3G and 4G
6.
4G還有一項相關就是WiMAX,WiMAX簡單說就是將wifi的 傳輸速度提升到剛剛所說的1Gbps的水準,但所發布的第 一版本依舊沒有達到標準。 3G and
4G
7.
目前主流的行動裝置作業系統: Google
Android 蘋果 iOS 黑莓機 微軟 Windows Phone 行動應用程式
8.
行動裝置使用者可透過無線網路連上行動軟體應用 程式商店免費或付費地下載使用行動軟體應用程式。 行動軟體應用程式商店除了可透過網頁瀏覽器如一 般網路商店般瀏覽與交易外,通常亦製作有專屬的 APP,讓使用者能一鍵進入,介面也較網頁更方便。 首先採用此商業模式的廠商是美國蘋果電腦公司針 對其行動裝置iPhone、iPad經營的「App Store」。 行動應用程式
9.
之後Google也隨其行動作業系統Android一同推出自 行經營的APP商店Google Play。App
Store以及 Google Play是目前營收和下載量的前兩大APP商店。 其他經營者包括作業系統廠商微軟公司、獨立行動 裝置廠商黑莓公司與亞馬遜公司、Android裝置廠商 如三星電子、Windows Phone裝置廠商如諾基亞、 網際網路服務供應商等,亦有獨立經營者。 行動應用程式
10.
App Store
Google Play Windows Phone Store 黑莓世界 亞馬遜行動軟體應用程式商店(英語:Amazon Appstore) 諾基亞行動軟體應用程式商店(英語:Nokia Ovi Store) 三星行動軟體應用程式商店(英語:Samsung Apps) 主要APP商店
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