可調性視訊編碼為H.264/AVC 影像編碼技術的延伸，除了原本H.264/AVC 的低位元輸出率、高抗錯性及網路友善性的優點，還加入了分層編碼的概念，提供了三種可調性：時間、空間及訊噪比可調性，可以依據網路的狀況和用戶端的裝置動態調整至最適當的位元流(bitstream)。
即使可調性視訊編碼有分層的概念，但當可調性視訊編碼在無線的環境傳輸時，因為無線的環境下頻寬的資源有限，且訊號容易受到訊號衰減、雜訊、干擾等外在因素影響，使得每個使用者在不同的時間、不同的地點受到這些因素的影響所能夠使用的頻寬有所不同，且由於可調性視訊編碼分層的特性使得每一層的碼率及重要性皆不相同，若在傳輸每一個層皆採用相同的實體層設定，則較無法充份利用可調性視訊編碼之特性進行傳輸。
本論文希望能讓使用者依據其本身的頻道狀況、服務需求等而解碼出相對應的視訊品質，所以在傳送每一個層時必須根據使用者的狀態適當的調整速率傳送，使用者在接收時才可以根據自己的服務需求解碼出相對應的視訊品質。因此針對可調式視訊資料的相依性提出了速率排程的方法，對在靜止狀態或是移動狀態下的使用者做速率分配，透過對每個要傳送的影片資料做重要性的排序後，且同時保證資料之間的相依性，再根據使用者的分布狀況，以其最適合的傳輸速率透過基地台廣播給接收者，如此不但能更有效地利用無線網路頻寬資源，也讓使用者盡量避免收到無法解碼的視訊資料。
根據實驗結果顯示，本論文所提出了速率排程方法，透過適當的速率分配，能夠提升在不同頻道條件下的使用者，無論是靜止或是移動的狀況下，都能夠提升他們所接收到的平均影片品質。

The Scalable Video Coding (SVC) is an extension of H.264/AVC. In
addition to the advantage of original H.264/AVC with low bit rate, high resistance of fault and network friendliness, it also owns the concept of layered coding, and offers three scalability: temporal, spatial and SNR which can be based on network conditions and client devices to dynamically adjust to the most appropriate bit stream.
When the SVC transmitting in the wireless environment, because the bandwidth of the wireless environment is limited and signals susceptible to signal attenuation, noise, interference extrinsic factors, so that each user at different times, in different locations affected by these factors, the bandwidth can be used differently. Since the SVC and hierarchical characteristics make each layer and the importance of neither the same rate, if the transmission of each physical layer are the same setting, less able to take full advantage of the characteristics of the SVC transmission.
Therefore, we propose a scheme, namely Scalable Video Multicast, to maximize the average video quality of multicast clients under diverse channel conditions.SVM send the appropriate transmission rate of each layer according to the channel condition of the users, when users receive, they can decode the corresponding video quality services according to their needs. The proposed scheme is dependency-aware that can assign each block a proper rate to get good reception quality at the multicast clients. Simulations show that the proposed rate scheduling for SVC blocks can improve the average video quality of multicast clients.
However, SVM not only do rate scheduling for stationary users but also for mobile users. When users continue to move, SVM must redo rate scheduling periodly.

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