為了因應日與俱增的網路服務需求，和提供更快速、涵蓋範圍更廣的無線網路服務， 國際電信聯盟(ITU)接續現有的3G無線通訊制定了4G通訊標準IMT-Advanced，為了達到IMT-Advanced的需求，3GPP發展出LTE-Advanced 標準，在LTE-Advanced中引入了四種關鍵技術，而其中的載波聚合技術(carrier aggregation)即為本論文探討資源分配演算法的重點之一。
LTE-A有向下相容，因此仍然使用SC-FDMA作為上行傳輸的技術，SC-FDMA中為了讓傳輸速度較快，分配資源的方式為分配一段連續頻譜給UE，目前已經有許多關於LTE SC-FDMA上行資源分配的演算法，但大部份演算法最主要是考量通道狀況來分配資源，卻少有將頻寬要求和UE間的優先順序等納入考量。
因此在本論文中將會設計一演算法，除了要能符合SC-FDMA中連續分配資源的規範，將頻寬要求和UE間優先順序納入考量外，還要考慮到加入LTE-A的關鍵技術載波聚合後，資源分配的方式及步驟。

In order to meet the strong demand for wirelessbroadband services ,the International Telecommunication Union(ITU) has initiated the standardization process of the next generation mobile communication systems, entitled IMT-Advanced or fourth-generation(4G) mobile systems . To fulfill and partly exceed the IMT-Advanced requirements, 3GPP release LTE-Advanced. In order to meet these requirements, a variety of techniques are used. Carrier aggregation is one of the main techniques introduced in LTE-Advanced. In this paper, we have developed an algorithm of resource allocation dealing with carrier aggregation in the LTE-Advanced system.
LTE-A system is backward compatible with LTE system, which means SC-FDMA technology is continue used in LTE-Advanced uplink. In order to speedup bit rates in uplink transmission, the system should allocate continuous spectrum to one UE. So far, there has been some research about resource allocation in LTE uplink. However, most people only take channel conditions into consideration in resource allocation when designing these algorithms. In our proposed method, we have designed an algorithm considering not only the channel condition but bandwidth required by UE and priority in different type of QoS. Moreover, our algorithm has a multiple-rounded allocation which suits for UE equipped with multi antennas.

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