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Access network evolution beyond third generation mobile communications

机译：超越第三代移动通信的接入网络演进

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Second-generation mobile radio systems have been deployed successfully worldwide. These systems have evolved to higher data rates and packet transmission. Third-generation mobile radio systems are currently being standardized worldwide to be initially deployed in 2001 and 2002 in different regions of the world. New advanced multimedia services are under development, and first services are already being offered in second-generation systems, which will provide new business opportunities. Already today discussion is starting on the development of systems beyond third-generation mobile radio systems due to the long timeframe for system specification and international standardization. However, today there is no clear vision available on such systems. This discussion takes into account the new deregulated and liberalized communication environment. This article presents a concept for a system beyond third-generation mobile radio systems, which comprises a combination of several optimized access systems in a common IP-based medium access and core network platform. These different access systems will interwork through horizontal and vertical handover, service negotiation, and global roaming. The different access systems are allocated to different mutually complementing cell layers in the sense of hierarchical cells with respect to cell size, coverage, and mobility to provide globally optimized seamless services to users. This vision requires extensive international research and standardization activities to solve many technical challenges. Key issues are the global interworking of different access systems on a common platform, advanced antenna concepts, and the implementation of multimode and multiband terminals and base stations through software-defined radio concepts.
机译：第二代移动无线电系统已在全球成功部署。这些系统已经发展到更高的数据速率和数据包传输。第三代移动无线电系统目前正在全球范围内标准化，将于2001年和2002年首先部署在世界不同地区。新的高级多媒体服务正在开发中，第二代系统已经提供了第一批服务，这将提供新的商机。由于系统规范和国际标准化的时间很长，今天已经开始讨论超越第三代移动无线电系统的系统的开发。但是，今天在此类系统上尚无明确的愿景。该讨论考虑了新的放松管制和开放的通信环境。本文介绍了第三代移动无线电系统以外的系统的概念，该系统包括基于通用IP的媒体访问和核心网络平台中的多个优化访问系统的组合。这些不同的接入系统将通过水平和垂直切换，服务协商以及全球漫游来互通。就小区大小，覆盖范围和移动性而言，在分层小区的意义上，将不同的接入系统分配给不同的相互补充的小区层，以向用户提供全局优化的无缝服务。为了实现这一愿景，需要进行广泛的国际研究和标准化活动，以解决许多技术难题。关键问题是在公共平台上不同接入系统的全球互通，高级天线概念以及通过软件定义的无线电概念实现多模和多频带终端及基站。

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