【正文】
段。 語音 2G 系統(tǒng)主 要的使用目的(提供語音能力)使其不能被拋棄,語音作為 3G 的一個組成部分,其因有豐富的渠道,將在這方面的嘗試并取代 2G,而 2G 只要有一個適當?shù)那拦芾砗驮黾訋捑涂杉訌娖湎嚓P(guān)性。因此, 2G 和 3G 提供者有不同的商業(yè)模式。這種方式可由雙模式手機來完成。 2. 外文原文應(yīng)以附件的方式置于譯文之后。 當一個人去旅行,漫游是必要的,它可以切換到 2G 模。 一般來說,它們可以被應(yīng)用于不同的目標市場,所以 2G 和 3G 可以被視為同一種進步,而不是相互競爭的技術(shù)。 市場需求表明 ,保留在網(wǎng)絡(luò)的第二代平臺該應(yīng)用服務(wù)模塊是大量的中等水平消費者所需要的。因此對于這個巨大的投資,經(jīng)營者需要平衡盈虧的計劃來分擔消費者的使用費用。 雖然大多數(shù)中等水平的用戶擁有手機,但他們僅在必要時使用它們。 2. 移動通信消費者 移動通信在尼日利亞的消費市場可分為三個部分:高端,中級和低端。 GSM接口不能對比特率變化較大的數(shù)據(jù)進行處理。 顯然,移動通信的特點大將在未來數(shù)年彰顯,在其中的多種數(shù)據(jù)將變得越來越重要。人們還認為一些市區(qū)由于認購這項服務(wù)的人口多成為交通繁忙的地區(qū)。 關(guān)鍵詞 : 第二代移動通信 第三代移動通信 通用分組無線業(yè)務(wù) 移動通信 寬帶碼分多址 全球通用移動通信系統(tǒng) 1. 導言 人們認為 2G 技術(shù)已經(jīng)黔驢技窮,因其傳輸信道完全用光從而缺少可用信道,即易傳輸擁塞。 因此,5 MHz 頻率片將提供對 GSM 系統(tǒng)的許多新的能 力。 生成的應(yīng)用程序與組 件多個多媒體突發(fā)流量不能得到有效處理的 GSM。 不過, GSM 運營商也可以將一些其他無線接入技術(shù)整合到網(wǎng)絡(luò) 來提高數(shù)據(jù)傳輸速率,例如,無線局域網(wǎng)系統(tǒng)在高峰期可提供高達的數(shù)十 Mbps( 100Mbps) 比特率,而這遠遠高于 標準的 UMTS 所能提供的。它們每月對通訊支出不足 1500N( 13 美元)。 最大的運營商投資 , 顯然是建立了無線接入網(wǎng),它確實這不包括接入許可證的高額花費。例如,在 2G 網(wǎng)絡(luò),消息可以以短信形式被傳遞到終端,但在 3G,同一個新聞服務(wù)可能會包括語音新聞的視頻剪輯或在新聞中附有生動的圖像。 雖然 2G 被作為一個劣等的技術(shù)形象而 3G 是一個技術(shù)先進的形象,他們各自保留自己的優(yōu)點和缺點。當用戶正在開展移動銀行,他 /她應(yīng)該能夠在 3G 服務(wù)領(lǐng)域而不使用現(xiàn)有的 GPRS。 researchers may drive the market initially Therefore, the high cost of accessing 3G makes relegating 2G a difficult task. 4. Application types Multimedia A multimedia service consists of several media ponents such as speech, video, still images, and music, which are already available in use as singlemedia application in 2G. For example, news may be delivered to terminals as SMS messages in 2G, but in 3G, the same news service may include voice news acpanied with video clips or still images from the most interesting pieces of news. The market requirement shows that a larger chunk of this application is required by middle level consumers which can remain 共 8 頁 第 7 頁 on the 2G platform of the work. Therefore, 2G systems are still very much relevant in delivering multimedia to customers. Voice The ability of 2G systems delivering voice which is its primary intent cannot be swept aside, voice being an integral part of 3G would try in this aspect to overshadow it due to it abundant channel, but a proper channel management and increased bandwidth would bolster the relevance of 2G. The requirement is just the increased number of channels. Inter access Inter access is an application required in almost every sphere of munication. This application is relatively easy to implement in 3G terminals. 2G is basically circuitswitched, but upgrades of EDGE and GPRS bring packet switching into 2G making it an IP work, this allows inter access though at a level not parable with 3G. 5. Conclusion In conclusion, this paper analyzed 2G and 3G from a view in terms of technologies, market structure/consumers. Although 2G is being taken as an inferior technology and 3G is perceived as an advanced technology, they each retain their own advantages and disadvantages. In general, 2G and 3G can be viewed as a p