LTE와 Wi-Fi를 위한 Throughput 기반의 수직 핸드오버 기술
Throughput Based Vertical Handover Control for LTE and Wi-Fi Network
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초록
본 논문에서는 이종의 네트워크 환경, 특히 Long Term Evolution(LTE)와 Wireless Fidelity(Wi-Fi) 사이의 수직 핸드오버에서 망의 Congestion 상황을 파악하고 Congestion 정도에 따라 Wi-Fi의 사용을 단계적으로 사용하는 새로운 수직 핸드오버 방식을 제안한다. 새로운 방식의 동기는 RSSI(Received Signal Strength Indicator)가 높아도트래픽이 증가하여 congestion이 발생하면 네트워크 성능이 떨어지는 것에 기인한다. 본 논문에서는 이러한 문제점들의 해결을 위하여 Guaranteeing Performance Vertical Handover(GP-VHO)를 제안한다. GP-VHO는 StreamControl Transmission Protocol(SCTP)의 멀티 홈밍 기능을 이용하면서 핸드오버의 기준으로 instant throughput을 사용하여 일정한 성능을 유지 할 수 있도록 한다. 또한 수직 핸드오버 상황에서 Wi-Fi에서 LTE로 바로 전환하지않고 CMT (Concurrent Multipath Transfer)를 일시적으로 수행함으로써 Wi-Fi망의 사용 효율을 극대화 한다. 본논문에서는 제안하는 GP-VHO의 알고리즘에 대하여 살펴보고 마지막으로 성능 분석을 통하여 그 효과를 확인해 보고자 한다.
Abstract
In this paper, we propose a new Vertical HandOver (VHO) scheme which control Wireless Fidelity (Wi-Fi)usage based on degree of congestion in heterogeneous networks specially Long Term Evolution (LTE) and Wi-Fi. Existing Wi-Fi handover scheme is based on RSSI (Received Signal Strength Indicator) criterion. This waycannot be triggered handover when Wi-Fi network is highly congested but device's RSSI values are high. Forsolving this problem we propose Guaranteeing Performance Vertical Handover (GP-VHO). GP-VHO usesmultihoming function of Stream Control Transmission Protocol (SCTP) and instant throughput for handovercriterion. GP-VHO can maintain a constant performance. In VHO situation, GP-VHO doesn't switchoverimmediately from Wi-Fi to LTE and carries out CMT (Concurrent Multipath Transfer) between Wi-Fi and LTE. By CMT, Wi-Fi usage efficiency is better than existing method. Finally, we analyze and simulate theperformance of proposed GP-VHO.
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