Abstract: Block-based transmission scheduling methods and systems are provided. First, a plurality of packets corresponding to at least one data flow is received. The packets of the data flow are accumulated to form a data block. Then, the data block of the data flow is scheduled and transmitted according to a transmission scheduling algorithm based on the unit of block. In some embodiments, when the length of the accumulated data block equals to or is greater than a predefined or dynamically calculated block length threshold, the data block is scheduled and transmitted according to the transmission scheduling algorithm. In some embodiments, when current time is equal to a specific time point derived from a dynamically calculated or a fixed time duration, the data block is scheduled and transmitted according to the transmission scheduling algorithm.