A link-indexed statistical traffic prediction approach to improving IEEE 802.11 PSM

Power management is an important technique to prolong the lifetime of battery-powered wireless ad hoc networks. The fact that the energy consumed in the idle state dominates the total power consumed on wireless network interfaces motivates use of protocols that put the radio into the sleep mode in the lack of communications activities. IEEE 802.11 PSM is a representative of such protocols. However, the performance of IEEE 802.11 is significantly degraded under PSM because of the wake-up latency thus introduced. In this paper, we propose a novel and complementary mechanism, named by Link-Indexed Statistical traffic Predictor (LISP) to improve IEEE 802.11 PSM. Essentially LISP employs a simple, light-weight traffic prediction method and enables each node to seek the inherent correlation between ATIM ACKs and incoming traffic. Once such a correlation is identified, a node en route stays awake in the beacon interval (BI) in which a packet is anticipated to arrive, thus bridging a "fr...

• Type: Journal
• Year: 2005
• Where: ADHOC
• Authors: Chunyu Hu, Jennifer C. Hou
• Keywords: ADHOC 2005, IEEE 802.11, Ieee 802.11 Psm, Wireless Ad Hoc Networks