A Novel Piggyback Selection Scheme in IEEE 802.11e HCCA

Hyun-Jin LEE  Jae-Hyun KIM  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.5   pp.1619-1622
Publication Date: 2008/05/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.5.1619
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Network
WLAN,  HCCA,  piggyback,  

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A control frame can be piggybacked onto a data frame to increase channel efficiency in wireless communication. However, if the control frame including global control information is piggybacked, the delay of the 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 the 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 rate" and evaluate the 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 the proposed scheme reduces average frame transmission delay and improves channel utilization about 24% and 25%, respectively.