Abstract
A control frame can be piggybacked onto a data frame to increase channel efficiency in wireless communication. However, if control frame including global control information is piggybacked, delay of data frame from a access point will be increased even though there is only one station with low physical transmission rate. It is similar to anomaly phenomenon in a network which supports multi-rate transmission. In this letter, we define this phenomenon as the piggyback problem at low physical transmission and evaluate effect of this problem with respect to physical transmission rate and normalized traffic load. Then, we propose a delay-based piggyback scheme. Simulations show that proposed scheme reduces average frame transmission delay and improves channel utilization about 24% and 25%, respectively.
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