Differences

This shows you the differences between two versions of the page.

--- etc:drafts:epmnets_review [2009/12/01 22:47] – udv
+++ etc:drafts:epmnets_review [2009/12/01 22:54] (current) – udv
@@ Line 57: / Line 57: @@
 WiFi’s disadvantages include:
-  * its use of the 2.4GHz spectrum, which is
+  * its use of the 2.4GHz spectrum, which is susceptible to interference.
-susceptible to interference.
+  * Its higher energy consumption when compared to other standards.
-  * Its higher energy consumption when
-compared to other standards.
 **WiMAX**
@@ Line 116: / Line 114: @@
 cially, assuming that the 802.16e network is always reachable anytime and
 anywhere,2 we just pay attention to the way how to find WLAN APs.
+  -  ...mobile station (MSTA) always monitors the availability of nearby WLAN APs by attempting to detect the WLAN signal.
+  - ...an MSTA moves only within a specific region, where at least one of WLAN APs is reachable
+...keeping the scan operation of WLAN without any guideline can be practically
+a bad idea in that MSTA is usually battery-powered. Since WLANs are of-
+ten deployed for hotspot services with spotty service coverages, keeping the
+WLAN interface turned on could often mean an inefficient use of energy [8].
+A straightforward approach to resolving this issue is to make the MSTA
+informed of the existence of WLAN APs directly by the network side instead
+of relying solely on the individual scan operation of MSTA.
+We propose a WLAN scanning algorithm, which uses the
+baseline scanning protocol specified by IEEE 802.11 standard [11] without
+an additional terminal module like GPS and enables the MSTA to manage
+the WLAN interface without human intervention. Especially, the proposed
+algorithm can statistically guarantee the scanning time needed until at least a WLAN AP is found.