外文翻譯---通用分組無(wú)線服務(wù)技術(shù)-其他專(zhuān)業(yè)-展示頁(yè)
2025-01-31 09:46本頁(yè)面
【正文】 wireless application protocol (WAP) Pointtopoint (P2P) service: interworking with the Inter (IP) If SMS over GPRS is used, an SMS transmission speed of about 30 SMS messages per minute may be achieved. This is much faster than using the ordinary SMS over GSM, whose SMS transmission speed is about 6 to 10 SMS messages per minute. Protocols supported GPRS supports the following protocols: inter protocol (IP). In practice, mobile builtin browsers use IPv4 since IPv6 is not yet popular. pointtopoint protocol (PPP). In this mode PPP is often not supported by the mobile phone operator but if the mobile is used as a modem to the connected puter, PPP is used to tunnel IP to the phone. This allows an IP address to be assigned dynamically to the mobile equipment. connections. This is typically used for applications like wireless payment terminals, although it has been removed from the standard. can still be supported over PPP, or even over IP, but doing this requires either a work based router to perform encapsulation or intelligence built in to the enddevice/terminal。 ., user equipment (UE). When TCP/IP is used, each phone can have one or more IP addresses allocated. GPRS will store and forward the IP packets to the phone during cell handover (when you move from one cell to another). TCP handles any packet loss (. due to a radio noise induced pause) 畢業(yè)設(shè)計(jì)說(shuō)明書(shū)（英文翻譯） 4 resulting in a temporary throttling in transmission speed. Hardware Devices supporting GPRS are divided into three classes: Class A : Can be connected to GPRS service and GSM service (voice, SMS), using both at the same time. Such devices are known to be available today. Class B : Can be connected to GPRS service and GSM service (voice, SMS), but using only one or the other at a given time. During GSM service (voice call or SMS), GPRS service is suspended, and then resumed automatically after the GSM service (voice call or SMS) has concluded. Most GPRS mobile devices are Class B. Class C : Are connected to either GPRS service or GSM service (voice, SMS). Must be switched manually between one or the other service. A true Class A device may be required to transmit on two different frequencies at the same time, and thus will need two radios. To get around this expensive requirement, a GPRS mobile may implement the dual transfer mode (DTM) feature. A DTMcapable mobile may use simultaneous v
黨政相關(guān)相關(guān)推薦
鄂ICP備17016276號(hào)-1