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首页> 外文期刊>Arabian Journal for Science and Engineering. Section A, Sciences >Vertical Handoff from WLAN to Cellular Network Based on Relay Environment
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Vertical Handoff from WLAN to Cellular Network Based on Relay Environment

机译：基于中继环境的WLAN垂直切换到蜂窝网络

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摘要

Seamless handoff in loosely coupled WLAN/cellular systems is still a challenging issue. Since the cellular network overlaps the WLAN during a handoff from a cellular network to a WLAN, this type of handoff is less complicated. Thus, all the attempts go toward the handoff from the WLAN to the cellular network. In the cellular network, this handoff is considered as a new call. Therefore, it has a significant delay which makes it inappropriate for the real-time services. The worst case occurs when a mobile station (MS) exits a building surrounding the WLAN. In such a case, there might not be enough time for the handoff to be completed due to the abrupt loss of the received signal strength indication. In this paper, the proposed solution uses MSs as relay stations (RSs) and the existing frequency channels dedicated to the RSs to provide the required WLAN coverage during the handoff process. The suggested solution is analyzed using a simple proposed analytical model. Both the analytic and simulation results confirm that the suggested method improves the handoff dropping probability.
机译：松散耦合的WLAN /蜂窝系统中的无缝切换仍然是一个具有挑战性的问题。由于蜂窝网络在从蜂窝网络到WLANF的切换期间与WLANF重叠，因此这种类型的切换不太复杂。因此，所有尝试都从WLAN到蜂窝网络的切换。在蜂窝网络中，此切换被视为新的呼叫。因此，它具有重要的延迟，这使得不适合实时服务。当移动台（MS）退出围绕WLAN的建筑物时发生最坏的情况。在这种情况下，由于接收信号强度指示的突然损失，可能没有足够的时间来完成。在本文中，所提出的解决方案使用MS作为中继站（RSS）和专用于RSS的现有频率信道，以在切换过程中提供所需的WLAN覆盖。使用简单的分析模型分析了建议的解决方案。分析和仿真结果都证实了建议的方法改善了切换丢弃概率。

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