Symbian OS和一些相關(guān)資料，內容不少，而且有些很專(zhuān)業(yè)。剛剛才收集整理了一份 技術(shù)術(shù)語(yǔ)白皮書(shū)，在這兒先放上來(lái)，大家共享。
1GIn mobile telephony, first-generation systems were analog, circuit-switched. Voice links were poor, handoff unreliable, capacity low, and security non-existent. 1G systems are not now under active development – indeed, in some areas 1G spectrum is being auctioned for 2G and 3G use.
在移動(dòng)電話(huà)技術(shù)中，第一代系統是模擬的電路交換系統。語(yǔ)音連接很差、越區切換不可靠、容量小且不具備安全性。目前，已不再積極開(kāi)發(fā)1G 系統— 實(shí)際上，在某些地區，1G 頻譜正針對2G 和3G 用途進(jìn)行拍賣(mài)。2GIn mobile telephony, second-generation protocols use digital encoding and include GSM, D-AMPS (TDMA) and CDMA. 2G networks are in current use around the world. These protocols support high bit rate voice and limited data communications. They offer auxiliary services such as data, fax and SMS. Most 2G protocols offer different levels of encryption.
在移動(dòng)電話(huà)技術(shù)中，第二代協(xié)議使用數字編碼，其中包括GSM、D-AMPS (TDMA) 和CDMA。2G 網(wǎng)絡(luò )目前正在全世界使用。這些協(xié)議支持高比特率語(yǔ)音和有限的數據通信功能。它們提供多種輔助服務(wù)，如數據、傳真和SMS。大多數2G 協(xié)議提供不同級別的加密。2.5GIn mobile telephony, 2.5G protocols extend 2G systems to provide additional features such as packet-switched connection (GPRS) and enhanced data rates (HSCSD, EDGE).
在移動(dòng)電話(huà)技術(shù)中，2.5G 協(xié)議將2G 系統擴展到提供諸如分組交換連接(GPRS) 的附加功能和更高的數據傳輸速率(HSCSD、EDGE)。3GIn mobile telephony, third-generation protocols support much higher data rates, measured in Mbps, intended for applications other than voice. 3G networks trials started in Japan in 2001. 3G networks are expected to be starting in Europe and part of Asia/Pacific by 2002, and in the US later. 3G will support bandwidth-hungry applications such as full-motion video, video-conferencing and full Internet access.
在移動(dòng)電話(huà)技術(shù)中，第三代協(xié)議支持更高的數據傳輸速率（以兆比特/秒計算），它們不僅適合于傳送語(yǔ)音，更可支持范圍廣泛的應用。3G 網(wǎng)絡(luò )試驗2001 年開(kāi)始于日本。到2002 年，已有部分歐洲和部分亞太地區開(kāi)始使用3G 網(wǎng)絡(luò )，以后將在美國使用。3G 將支持占用大量帶寬的應用程序，如全動(dòng)感視頻、視頻會(huì )議和完全的Internet 訪(fǎng)問(wèn)。AMPSAdvanced Mobile Phone System: a 1G standard which operates in the 800-900MHz-frequency band. It is still widely used in the United States.
高級移動(dòng)電話(huà)系統：工作于800-900MHz 波段下的1G 標準。它仍在美國廣泛使用。AnalogThe simple way to transmit speech, which is translated into electronic signals of different frequency and/or amplitude. The first networks for mobile phones, as well as broadcast transmissions, were analog. Due to being longer established in some countries, analog networks may offer better coverage than digital networks, however analog phones are less secure and suffer more from interference where the signal is weak. Analog systems include AMPS, NMT and ETACS.
用于傳輸語(yǔ)音的簡(jiǎn)單方法，它們轉換為不同頻率和/或振幅的電子信號。第一個(gè)手機網(wǎng)絡(luò )和廣播傳輸網(wǎng)絡(luò )都是模擬的。由于模擬網(wǎng)絡(luò )在一些國家建立的時(shí)間較長(cháng)，所以它可能比數字網(wǎng)絡(luò )的覆蓋面更寬，然而，模擬手機的安全性較差，且在信號較弱的情況下下更容易受到干擾。模擬系統包括AMPS、NMT 和ETACS。APIHistorically, "application programming interface". Practically, an API is any interface that enables one program to use facilities provided by another, whether by calling that program, or by being called by it. At a higher level still, an API is a set of functionality delivered by a programming system, and as such the mix of APIs in a particular system tells you what that system can do.
在歷史上是指“應用程序編程接口”。實(shí)際上，API 是指允許一個(gè)程序使用另一個(gè)程序的功能（通過(guò)調用另一個(gè)程序或被另一個(gè)程序調用）的任何接口。從更高層面上講，API是一組由編程系統提供的功能，同樣，特定系統中的不同API 告訴您該系統可以執行的操作。BluetoothAn open specification for seamless wireless short-range communications of data and voice between both mobile and stationary devices. For instance, it specifies how mobile phones, computers and PDAs interconnect with each other, with computers, and with office or home phones. The first generation of Bluetooth permits exchange of data up to a rate of 1 Mbps per second, even in areas with much electromagnetic disturbance. It transmits and receives via a short-range radio link using a globally available frequency band (2.4 GHz ISM band).
在移動(dòng)設備和固定設備之間短距離傳送數據和語(yǔ)音的無(wú)線(xiàn)通信的開(kāi)放式規范。例如，它指定手機、計算機和PDA 之間如何互連、如何與計算機、辦公室電話(huà)或家庭電話(huà)互連。第一代藍牙允許以最高1Mbps/s 的速率交換數據，即便是在電磁干擾較為厲害的地區。它使用全球可用的波段（2.4 GHz ISM 波段），通過(guò)短程無(wú)線(xiàn)鏈路傳輸和接收數據。bpsBits per second: a way of quantifying data transmission throughput. It is the number of pieces of information (bits) transmitted or received per second.
比特/秒：一種量化數據傳輸吞吐量的方法。它是指每秒傳輸或接收的信息段的數量（比特）。C++An industry standard ｏｂｊｅｃｔ-oriented compiled language, formally standardized in 1998, but tracing its history to the early 1980s, with an heritage in C and Simula. C++ is a general-purpose programming language with a bias towards systems programming. C++ runs on most computers from the most powerful supercomputers to the ubiquitous personal computers.
Symbian OS is written in C++.
一種工業(yè)標準的面向對象的編譯語(yǔ)言，于1998 年正式標準化，但是其歷史可追溯到二十世紀八十年代早期，它繼承了C 和Simula。 C++ 是一種偏向于系統編程的通用編程語(yǔ)言。C++ 可在大多數計算機上運行：從最強大的超級計算機到普遍存在的個(gè)人計算機。Symbian 操作系統是用C++ 編寫(xiě)的。CDMACode Division Multiple Access: a digital wireless telephony transmission technique.
1. CDMA allows multiple frequencies to be used simultaneously (Spread Spectrum). The CDMA idea was originally developed for military use over 30 years ago.
2. The CDMA standards used for second-generation mobile telephony are the IS-95 standards championed by QUALCOMM.
"碼分多路訪(fǎng)問(wèn)：一種數字無(wú)線(xiàn)電話(huà)傳輸技術(shù)。
1. CDMA 允許同時(shí)使用多個(gè)頻率（擴展頻譜）。CDMA 的概念最初是為軍事用途開(kāi)發(fā)的。
2. 用于第二代移動(dòng)電話(huà)技術(shù)的CDMA 標準是由QUALCOMM支持的IS-95 標準。"Cellular radioThe technology that has made large scale mobile telephony possible. Current cellular networks reuse the same radio frequencies by assigning them to cells far enough apart to reduce interference. A cell is the geographical area covered by one radio base station transmitting/receiving in the center. The size of each cell is determined by the terrain, transmission power, and forecasted number of users. Service coverage of a given area is based on an interlocking network of cells, called a cell system.
這項技術(shù)已經(jīng)使大規模移動(dòng)電話(huà)技術(shù)成為可能。當前的蜂窩網(wǎng)絡(luò )通過(guò)將相同的無(wú)線(xiàn)電頻率分配到遠遠分隔的小室來(lái)減少干擾，以重復使用這些頻率。小室是由位于中心的無(wú)線(xiàn)電基站傳輸/接收所覆蓋的地理區域。每個(gè)小室的大小由地形、發(fā)射功率和預測的用戶(hù)數來(lái)確定。給定地區的服務(wù)覆蓋范圍基于小室的聯(lián)鎖網(wǎng)絡(luò )（名為小室系統）。Circuit-SwitchingMeans of creating a connection by setting up a dedicated end-to-end circuit, which remains open for the duration of the communication.
建立連接的方法— 通過(guò)設置一個(gè)在通信期間保持開(kāi)放的專(zhuān)用的端對端電路。CLDCJ2ME Connected Limited Device Configuration. The CLDC serves the market consisting of personal, mobile, connected information devices. This configuration includes some new classes designed specifically to fit the needs of small-footprint devices.
J2ME 連接有限設備配置。CLDC 為由個(gè)人移動(dòng)連接信息設備組成的市場(chǎng)提供服務(wù)。這種配置包括一些專(zhuān)為滿(mǎn)足小型設備的需求而設計的新類(lèi)別。Content ProviderA company that provides services to mobile phone users or network operators. These services could be shopping, web surfing, chat rooms, playing games, accessing data such as music and books through a server.
用來(lái)向手機用戶(hù)或網(wǎng)絡(luò )運營(yíng)商提供服務(wù)的公司。這些服務(wù)可以是購物、網(wǎng)絡(luò )沖浪、聊天室、玩游戲、通過(guò)服務(wù)器訪(fǎng)問(wèn)數據（如音樂(lè )和圖書(shū)）。D-AMPSDigital AMPS (Digital-Advanced Mobile Phone Service) is the digital wireless standard widely used throughout the Americas, Asia Pacific and other areas. D-AMPS uses digital TDMA on the one hand, and is required to be compatible with installed AMPS base station networks on the other. D-AMPS operates on the 800 and 1900 MHz bands.
數字AMPS（數字— 高級手機服務(wù)）是廣泛用于美國、亞太地區和其他地區的數字無(wú)線(xiàn)標準。一方面，D-AMPS 使用數字TDMA，另一方面，D-AMPS 必須與已安裝的AMPS基站網(wǎng)絡(luò )兼容。D-AMPS 使用800 和1900MHz 波段。DCS 1800Digital Communications System: another name for GSM working on a radio frequency of 1800 MHz. Also known as GSM1800 or PCN, this digital network operates in Europe and Asia Pacific.
數字通信系統：在1800MHz 無(wú)線(xiàn)電頻率下工作的GSM 的另一個(gè)名稱(chēng)。也稱(chēng)作GSM 1800 或PCN，該數字網(wǎng)絡(luò )在歐洲和亞太地區使用。Dual bandDual band mobile phones can work on networks that operate on different frequency bands. This is useful if you move between areas covered by different networks. Some networks operate on two bands, for instance GSM-1800 in town centers and GSM-900 in the rest of the country.
雙頻手機可以在不同波段的網(wǎng)絡(luò )中使用。如果您在由不同網(wǎng)絡(luò )覆蓋的地區之間漫游，則這非常有用。一些網(wǎng)絡(luò )使用兩個(gè)波段，例如，GSM-1800 在城市中心使用，而GSM-900 在國家的其余地區使用。Dual modeDual mode mobile phones have more than one air interface and hence can work on more than one network. One example is phones that operate on both digital and analog networks. They are quite useful if you want the advantages of a digital phone, but regularly visit areas where analog is the only service available.
雙模式手機有多個(gè)空中接口，因此可以在多個(gè)網(wǎng)絡(luò )下工作。既可以在數字網(wǎng)中工作、又可以在模擬網(wǎng)絡(luò )中工作的手機就是一個(gè)例子。如果您希望利用數字手機，但是經(jīng)常訪(fǎng)問(wèn)只提供模擬服務(wù)的地區，則這樣的手機相當有用。EDGEEnhanced Data Rates for GSM Evolution. An enhanced modulation technique designed to increase network capacity and data rates in GSM networks. EDGE should provide data rates up to 384 Kbps. EDGE will let operators without a 3G license to compete with 3G networks offering similar data services. EDGE is not expected before 2001 at the earliest.
從GSM 演變來(lái)的增強的數據速率。它是一種增強的調制技術(shù)，旨在增加GSM 網(wǎng)絡(luò )的容量和數據速率。EDGE 應當提供高達384Kbps 的數據速率。EDGE 將允許沒(méi)有3G 許可證的運營(yíng)商與提供類(lèi)似數據服務(wù)的3G 網(wǎng)絡(luò )進(jìn)行競爭。預計EDGE 最早不會(huì )早于2001 年。GPRSGeneral Packet Radio Service: a radio technology for GSM networks that adds packet-switching protocols, shorter set-up time for ISP connections, and offer the possibility to charge by amount of data sent rather than connect time. GPRS promises to support flexible data transmission rates typically up to 20 or 30 Kbps (with a theoretical maximum of 171.2 Kbps), as well as continuous connection to the network. A 2.5G enhancement to GSM, GPRS is the most significant step towards 3G, needing similar business model, and service and network architectures. GPRS started to appear in some networks during 2000.
通用分組無(wú)線(xiàn)業(yè)務(wù)：一種GSM 網(wǎng)絡(luò )技術(shù)，其中增加了分組交換協(xié)議，縮短了ISP 連接的設置時(shí)間。并實(shí)現了按發(fā)送的數據量（而非連接時(shí)間）收費的可能性。GPRS 承諾支持通常高達20 或30Kbps（最大理論值為171.2Kbps）的靈活的數據傳輸速率，以及與網(wǎng)絡(luò )的不間斷連接。GPRS 是對GSM 的2.5G 增強，它是面向3G 的最重要的步驟，它需要類(lèi)似的業(yè)務(wù)模型以及服務(wù)和網(wǎng)絡(luò )結構。GPRS 于2000 年開(kāi)始出現在某些網(wǎng)絡(luò )中。
