適用於IEEE 802.16j Multi-hop Relay系統之新型頻率規劃方法

Abstract

IEEE 802.16j為IEEE 802.16無線寬頻接取標準的之增修版本，其定義了可支援多重躍進之中繼站，此技術標準的目標為延伸系統涵蓋範圍、改善使用者之傳輸率並提升整體之系統容量。然而，先前的研究顯示RS的佈放可能會導致整體系統容量的損失，其原因在於為支援relay link所產生大量的overhead將消耗過多的無線資源，致使傳輸速率的提升無法彌補其所造成容量上的損失。另一方面，先前的研究亦顯示較積極的重複使用頻率資源可有效的改善多重躍進系統之容量。本篇論文提出了一套有效之頻率規劃方法，可在確保涵蓋範圍之前提下大幅提升頻率資源重複使用之程度。在RS均勻佈放於網路之情形下，本文提出了以”Sub-cell”為基礎之新型頻率規劃方法。經由模擬結果證實，所提出之方法可較傳統之方法大幅提升137.75%之系統容量，且依然能確保系統之涵蓋範圍。

IEEE 802.16j is an amendment to the IEEE 802.16 broadband wireless access standard to enable the operation of multi-hop relay stations (RS). It aims to enhance the coverage, per user throughput and system capacity of IEEE 802.16e. However, previous researches show that deploying RS may result in worse system capacity due to the overhead in relay links. Fortunately, it also shows that aggressive frequency reuse can be the key to improve the capacity of multi-hop relay (MR) networks. In this thesis, novel frequency planning techniques are proposed for aggressive frequency reuse in IEEE 802.16j MR network. For the MR network with uniformly deployed RS, a novel frequency planning technique based on “sub-cell” concept is proposed. Simulation results show that up to 137.75% capacity improvement with guaranteed coverage can be achieved with respect to the traditional techniques.