Two-level Aggregation with Adaptive Frame Length for Ultra-high Speed WLAN
Frame aggregation mechanism introduced by IEEE 802.11n could significantly improve the throughput at MAC layer. The new generation of Wireless Local Area Network (WLAN) aims to improve the throughput and support multimedia service. Real-time requirement is necessary for multimedia service, so the delay can't exceed the particular limit value. In this paper, the performance of two-level aggregation is analyzed. Both saturated throughput and frame delay are derived theoretically under error-prone channel. Based on a two-dimension Markov chain model, an algorithm is proposed to dynamically adjust the A-MSDU (MAC Service Data Unit Aggregation) frame length in two-level aggregation according to the channel bit error rate and delay limit in order to maximize the throughput and meet the service delay requirement meanwhile.