working

Jinghao Shi
1 parent a39a69d3
Showing 3 changed files with 17 additions and 16 deletions
design.tex
introduction.tex
progress.tex
@@ -16,11 +16,12 @@ the main components of \PS{}.
 Idle smartphones can be used to improve nearby device's network performance. For
 example, in Figure~\ref{fig:system}, when \PS{} Access Point (AP) sends
-synchronous query about active device's spectrum condition, \PS{} clients,
-depending on proximity with interested device, will perform detailed spectrum measurements on
-behalf of nearby devices. This information can then be feed into AP adaption
-algorithms for channel assignment, rate adaption or power control---all without
-disturbing the active client.
+synchronous query about spectrum condition of the active device (laptop),
+nearby \PS{} client
+(smartphone) will perform detailed measurements \textit{on behalf of} the
+laptop. This information can then be feed into AP adaption algorithms for
+channel assignment, rate adaption or power control---all without disturbing the
+current network session of the active client.
 On other hand, to cope with rapidly-changing network environment caused by mobility,
 smartphones already perform aggressive network exploration and thus naturally
@@ -20,7 +20,7 @@
 }
 We're currently developing an prototype system implementing CANSAS for \wifi{}
-networks called \PS{}. It collects measurements from passive smartphones and use
-them to improve network performance. \PS{} also captures the large number of
-measurements made naturally by smartphones as they discover and connect to
+networks called \PS{}. It collects measurements from passive smartphones to
+improve network performance. \PS{} also captures the large number of
+measurements generated naturally by smartphones as they discover and connect to
 networks---valuable data that is currently discarded.
 \section{Current Progress}
 \label{sec:progress}
-We have set up a testbed of 4 programmable APs
-running customized OpenWRT firmware, with which we experiment joint channel
-assignment, rate adaption and client association algorithms. On device side, we
-modified \wifi{} driver of Nexus 5 devices to enable \wifi{} monitor mode, which
-provides more detailed spectrum utilization information. We are currently
-developing an \PS{} Android app. We are conducting small scale controlled
-experiments, and are also preparing to deploy our system on
-\PhoneLab{}---a large smartphone testbed operated at UB.
+We modified the \wifi{} chipset driver of Android to enable \wifi{} monitor
+mode, which enables the smartphone to perform detailed spectrum measurements.
+We have set up a group of OpenWRT APs to experiment spectrum allocation
+algorithms. We are conducting small scale experiments to show: the usefulness of
+detailed client-side measurements, the performance penalty of collecting them
+from active clients, and the feasibility of using smartphones to help nearby
+devices. We are also preparing to deploy our system on \PhoneLab{}---a large
+smartphone testbed operated at UB.