外文翻譯---寬帶cdma無(wú)線接入網(wǎng)的基本概念-文庫(kù)吧資料
2024-09-04 17:10本頁(yè)面
【正文】 Controller via the Iub interface. One Radio Base Station can handle one or more cells.Radio Network Controller (RNC)The Radio Network Controller is the node that controls all WCDMA Radio Access Network functions. It connects the WCDMA Radio Access Network to the core network via the Iu interface. There are two distinct roles for the RNC, to serve and to control. The Serving RNC has overall control of the handset that is connected to WCDMA Radio Access Network. It controls the connection on the Iu interface for the handset and it terminates several protocols in the contact between the handset and the WCDMA Radio Access Network.The Controlling RNC has the overall control of a particular set of cells, and their associated base stations. When a handset must use resources in a cell not controlled by its Serving RNC, the Serving RNC must ask the Controlling RNC for those resources. This request is made via the Iur interface, which connects the RNCs with each other. In this case, the Controlling RNC is also said to be a Drift RNC for this particular handset. This kind of operation is primarily needed to be able to provide soft handover throughout the network.Radio Access Bearers (RAB)The main service offered by WCDMA RAN is the Radio Access Bearer (RAB). A RAB is needed to establish a call connection between the handset and the base station. Its characteristics ate determined by certain Quality of Service (QoS) parameters, such as bit rate and delay, and are different depending on what kind of service/information to be transported.The RAB carries the subscriber data between the handset and the core network. It is posed of one or more Radio Access Bearers between the handset and the Serving RNC, and one Iu bearer between the Serving RNC and the core network. 3GPP has defined four different quality classes of Radio Access Bearers:●Conversational (used for . voice telephony) low delay, strict ordering ●Streaming (used for . watching a video) moderate delay, strict ordering ●Interactive (used for . web surfing) moderate delay ●Background (used for . me transfer) no delay Transport in WCDMA Radio Access Network The WCDMA Radio Access Network nodes municate with each other over a transport network. The 3GPP specification provides a very clear, split between radio related (WCDMA)functionality and the transport technology, meaning that there is no particular bias to any technology. The transport network is initially based on ATM, but IP will soon be included as an option.附錄4：英文資料譯文寬帶CDMA無(wú)線接入網(wǎng)的基本概念一、背景過(guò)去十年，無(wú)線通信技術(shù)有了巨大發(fā)展，用戶量的顯著增加，使得諸如游戲、音樂(lè)下載和視頻流量有了新的容量需求。 for Handover to GSM,39。 investments in GSM equipment can be reused. Examples are the reuse and evolution of the core network, the focus on cositing and the support of GSM handover. In order to use GSM handover, the39。附錄3：英文資料Basic Concepts of WCDMA Radio Access Network 1. BackgroundThere has been a tremendous growth in wireless munication technology over the past decade. The significant increase in subscribers and traffic, new bandwidth consuming applications such as gaming, music down loading and video streaming will place new demands on capacity. The answer to the capacity demand is the provision of new spectrum and the development of a new technology Wideband CDMA or hereinafter referred to as WCDMA. WCDMA was developed in order to create a global standard for real time multimedia services that ensured international roaming. With the support of ITU (International Telemunication Union) a specific spectrum was allocated 20Hz for 3G tele systems. The work was later taken over by the 3GPP (3rd Generation Partnership Project), which is now the WCDMA specification body with delegates from all over the world.2. WCDMA a develo
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