Almost overhead-free dynamic sleep window adjusting policy for mobile communication systems

One of important and difficult issues in power saving is how to determine the most appropriate sleep window timing and size for unpredictable non-real-time traffic. This paper proposes an almost overhead-free dynamic sleep window adjusting policy (D-SWAP) for mobile communication systems. Based on monitoring downlink traffic patterns, it adopts the concept of round-trip-time (RTT) estimation in TCP to enable base station and mobile station to autonomously adjust the sleep window timing and size. The performance evaluation shows that the proposed D-SWAP can concurrently satisfy the requirements of the trade-off problem between power saving and packet delay.