A16B-3200-0042
A16B-3200-0042
A16B-3200-0042
《聯(lián)系人；歐先生》
E392型無線上網(wǎng)卡采用高通公司的MDM9x00多模芯片組，同時(shí)支持TD-SCDMA/WCDMA 的3G 網(wǎng)絡(luò)標(biāo)準(zhǔn)和LTE-TDD/FDD 的4G 網(wǎng)絡(luò)標(biāo)準(zhǔn)。目前，利用3G網(wǎng)絡(luò)中已經(jīng)部署升級(jí)的HSPA+技術(shù)，下行峰值速率可以達(dá)到21 Mbps，上行峰值速率可以達(dá)到5.76 Mbps;部分地區(qū)采用64QAM調(diào)制技術(shù)和MIMO技術(shù)對(duì)HsPA+進(jìn)行再次升級(jí)，下行峰值速率可以達(dá)到42 Mbps左右;而即將部署的4G網(wǎng)絡(luò)，下行峰值速率可以達(dá)到i00Mbps，上行峰值速率可以達(dá)到50 Mbps。TL-WN821N 型無線網(wǎng)卡是基于Realtek公司的RTL8192cu芯片設(shè)計(jì)的，采用MIMO技術(shù)和空頻道檢測(cè)技術(shù)，支持802.11n/b/g，性能穩(wěn)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(shè)備的帶寬需求。
3. 3G/4G路由器關(guān)鍵技術(shù)
3G/4G路由器是指利用WiFi的2.4GHz頻段，組建一個(gè)無線局域網(wǎng)，并配置無線局域網(wǎng)的基本信息，通過Linux系統(tǒng)的iptables將無線局域網(wǎng)接人到3G/4G網(wǎng)絡(luò)中。其關(guān)鍵技術(shù)具體分為3G/4G網(wǎng)絡(luò)的接入、無線局域網(wǎng)的組建以及iptables的連通三個(gè)部分。
3.1 3G/4G網(wǎng)絡(luò)的接入
該無線路由器利用E392型多模無線上網(wǎng)卡在嵌入式Linux系統(tǒng)中進(jìn)行PPP撥號(hào)，分別接入到TD-SCDMA，WCDMA以及TD-LTE實(shí)驗(yàn)網(wǎng)中。其具體實(shí)現(xiàn)流程如圖3所示。
圖3 3G/4G網(wǎng)絡(luò)接入流程圖
3.1.1 多模無線上網(wǎng)卡驅(qū)動(dòng)加載
當(dāng)一個(gè)新的USB設(shè)備接入到Linux主機(jī)中，主機(jī)首先會(huì)通過控制端點(diǎn)讀入此設(shè)備的配置，接口和端點(diǎn)等信息，利用控制管道完成控制型傳輸，然后主機(jī)再對(duì)該設(shè)備進(jìn)行枚舉。枚舉即讀取該 設(shè)備的許多重要信息，其中最重要的是讀取該設(shè)備的生產(chǎn)商識(shí)別碼(VID)以及產(chǎn)品識(shí)別碼(PID)，將這兩個(gè)識(shí)別碼分別與USB內(nèi)核中意存在的各個(gè)識(shí)別碼進(jìn)行匹配。若匹配成功，即的利用Linux系統(tǒng)的USB內(nèi)核成功實(shí)現(xiàn)了 該設(shè)備的USB驅(qū)動(dòng)的加載。
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