Wake-up Signaling via WLAN Frames : How to Improve Reliability

概要

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Access points (APs) of wireless LANs (WLANs) are always powered on in order to serve mobile nodes promptly, although many APs are idle during much of the time and consume a large percentage of power in the idle state. It is necessary to put idle APs into sleep to realize green WLANs. The problem, however, is how to quickly and reliably activate APs from sleep when nodes initiate new data flows. In the previous works, we showed that nodes can transmit wake-up ID to APs by modulating lengths of WLAN frames. But the performance is limited by the frame length detection and may be further degraded by interfering frames. In this paper, we suggest improving the reliability of this scheme by the following methods : (i). We suggest using the burst transmission of WLAN frames for the wake-up signaling, which prevents interfering WLAN signals from breaking in, and, (ii), instead of directly detecting frame length, the burst transmission of WLAN frames for wake-up signaling is re-interpreted as equivalent ID. We analyze hamming distance of equivalent IDs and suggest partial correlation to reduce error rate of detecting wake-up signals. Simulation results confirm the effectiveness of the proposed scheme.
2011-10-19