LTE-Advanced通訊系統中接力傳輸資源分配策略探討

Abstract

接力傳輸這個通訊上的概念，是一個能提升抽象上通訊傳輸的空間維度進而提升通訊系統傳輸品質的可行方法，可使其傳輸系統的表現能夠獲得顯著的提升。 在現存的文獻中，有許多有關接力傳輸資源分配議題的探討。在這篇論文內，我們將重點放在LTE-Advanced 系統中多接力傳輸節點與多使用者的資源分配在這個問題上。在LTE-Advanced 系統中，接力傳輸已經不再是一個概念，而是一個被訂定的通訊標準。然而其中仍存在許多的困難與挑戰亟需克服。例如： 邊緣使用者的效能提升問題。 在此篇論文中，我們提出了一個新的資源傳輸資源分配的策略 RIMM，讓其能夠同時達成邊緣使用者效能的顯著提升與消除極差值存在的雙重目標，並利用匈牙利演算法來幫助我們達成此一目的。我們比較了許多現存的方法，像是最大化整體效能、最大化最小值以及公平行等資源分配策略，分別以不同的面向，來讓這些策略做綜合方面的比較。更透過各個使用者的效能的一一比較，讓彼此分配策略之間，做最直接的分析與比較。

There were many works on the research of relay assignment issue. Relay network, in the form of keeping each its own antennas and having a node exploit a relay node’s antennas, is shown to be a promising approach to enhance spatial diversity. Moreover, improving the spatial diversity of transmission could achieve the main purpose of increasing performance in data transmission. In this work, we pay our attention to the multiple-users-multiple-relays relay assignment on LTE-Advanced (4G) , the future communication technology, because relay transmission is an important concept in LTE-Advanced system. We will proposed a strategy called RIMM for assignment of multiple relay nodes (RN) to multiple users (UE): We want to maximize UEsawareness of performance improvement overall system after introducing the relay nodes (RN). Instead of maximizing the aggregate performance, we want to take our main purpose on maximizing the relative improvement of users (UE) overall system, that is a ratio of performance improvement to the corresponding original performance value and achieve the max-min feature simultaneously. By that relay strategy, it will take advantage of increasing the spatial diversity and the performance of transmission to achieve the perspective of improving the inferior users’ (UE) transmission performance. Then we will transform the relay assignment problem with this relay strategy into bipartite matching problem and introduce the Hungarian algorithm to get the optimal solutions.