A16B-3200-0042
A16B-3200-0042
A16B-3200-0042
《聯系人；歐先生》
E392型無線上網卡采用高通公司的MDM9x00多模芯片組，同時支持TD-SCDMA/WCDMA 的3G 網絡標準和LTE-TDD/FDD 的4G 網絡標準。目前，利用3G網絡中已經部署升級的HSPA+技術，下行峰值速率可以達到21 Mbps，上行峰值速率可以達到5.76 Mbps;部分地區采用64QAM調制技術和MIMO技術對HsPA+進行再次升級，下行峰值速率可以達到42 Mbps左右;而即將部署的4G網絡，下行峰值速率可以達到i00Mbps，上行峰值速率可以達到50 Mbps。TL-WN821N 型無線網卡是基于Realtek公司的RTL8192cu芯片設計的，采用MIMO技術和空頻道檢測技術，支持802.11n/b/g，性能穩定且能夠提供最大300 Mbps的無線傳輸速率，完全滿足智能終端等設備的帶寬需求。
3. 3G/4G路由器關鍵技術
3G/4G路由器是指利用WiFi的2.4GHz頻段，組建一個無線局域網，并配置無線局域網的基本信息，通過Linux系統的iptables將無線局域網接人到3G/4G網絡中。其關鍵技術具體分為3G/4G網絡的接入、無線局域網的組建以及iptables的連通三個部分。
3.1 3G/4G網絡的接入
該無線路由器利用E392型多模無線上網卡在嵌入式Linux系統中進行PPP撥號，分別接入到TD-SCDMA，WCDMA以及TD-LTE實驗網中。其具體實現流程如圖3所示。
圖3 3G/4G網絡接入流程圖
3.1.1 多模無線上網卡驅動加載
當一個新的USB設備接入到Linux主機中，主機首先會通過控制端點讀入此設備的配置，接口和端點等信息，利用控制管道完成控制型傳輸，然后主機再對該設備進行枚舉。枚舉即讀取該 設備的許多重要信息，其中最重要的是讀取該設備的生產商識別碼(VID)以及產品識別碼(PID)，將這兩個識別碼分別與USB內核中意存在的各個識別碼進行匹配。若匹配成功，即的利用Linux系統的USB內核成功實現了 該設備的USB驅動的加載。
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