Cross-layer QoS Analysis of Opportunistic OFDM-TDMA and OFDMA Networks

Abstract— Performance analysis of multiuser orthogonal frequency division multiplexing (OFDM-TDMA) and orthogonal frequency division multiple access (OFDMA) networks in support of multimedia transmission is conducted in this work. We take a cross-layer approach and analyze several quality-of-service (QoS) measures that include the bit rate and the bit error rate (BER) in the physical layer, and packet average throughput/delay and packet maximum delay in the link layer. We adopt a cross-layer QoS framework similar to that in IEEE 802.16, where service classification, flow control and opportunistic scheduling with different subcarrier/bit allocation schemes are implemented. In the analysis, the Rayleigh fading channel in the link layer is modeled by a finite-state Markov chain, and the channel state information (CSI) is assumed to be available at the base station. With the M/G/1 queueing model and flow control results, our analysis provides important insights into the performance d...

• Type: Journal
• Year: 2007
• Where: JSAC
• Authors: Yu-Jung Chang, Feng-Tsun Chien, C. C. Jay Kuo
• Keywords: JSAC 2007, Link Layer, Orthogonal Frequency Division, Orthogonal Frequency Division Multiple Access