載波聚合(Carrier Aggregation)技術成為LTE-Advanced 實現大頻寬的關鍵技術，可以想像的是這項技術也帶來了諸多的挑戰。一開始將初步介紹載波聚合技術，並且根據日本營運商NTT DoCoMo 在3GPP RAN2 會議裡所提出的載波聚合配置情境來探討載波單元分配問題。因為使用者能力與位置不同而所能使用的載波單元也不同，這 導致了某些載波單元過於擁擠。本文使用兩層演算法，上層JWSQ 載波單元分配演算法用來解決使用者間載波單元重疊問題，下層為PF演算法，而JWSQ 考慮了載波內使用者傳輸狀況也考慮載波單元負載狀況，經由模擬證明，利用這兩層演算法，可增進系統載波單元間的負載平衡，也可提高使用者間的傳輸公平性。 Carrier Aggregation (CA) is the key technique to realize wide bandwidth in the LTE-Advanced system. There exist lots of challenge to aggregate multiple Carrier Components (CCs). This study starts with a brief introduction of CA and then discusses the CC assignment of the CA scenarios proposed by the Japanese carrier NTT DoCoMo in the third Generation Partnership Project Radio Layer 2 (3GPP RAN2) meeting. A 2-layer algorithms is then proposed. Layer-1 is the proposed CC assignment algorithm, called JWSQ, which considers user transmission situation and carrier loading condition. The JWSQ solves the problem of overlapping of CC among multiple users. Further, Layer-2 is the PF algorithm in the literature. The simulation results proves that the 2-Layer algorithms can enhance the carrier load balance and transmission fairness among users.
