Abstract
To solve interference in a heterogeneous network, LTE-A uses almost blank subframe (ABS) to improve channel quality of picocells at the expense of macrocell’s transmission. Many studies find the ABS ratio based on user number or traffic load. However, the issue of real-time (RT) packet delay is not well studied. We thus develop a delay-aware ABS adjustment (DA3) method to improve performance and lower packet dropping. DA3 estimates cells’ capacity to decide the ratio, and analyzes queue content to alleviate packet discard. Simulation results show that DA3 increases cells’ goodput while reducing RT packet dropping.
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