Cross-layer modeling for quality of service guarantees over wireless links
IEEE Transactions on Wireless Communications
We propose a cross-layer approach to investigate the impact of physical-layer infrastructure on datalink-layer quality-of-service (QoS) performance over wireless links in mobile networks. At the physical layer, we take multiple-input-multiple-output (MIMO) diversity schemes as well as adaptive-modulationand-coding (AMC) techniques into account. At the data-link layer, our focus is on how this physicallayer infrastructure influences the real-time multimedia delay-bound QoS performance. To
... formance. To achieve this goal, we first model the physical-layer service process as a finite-state Markov chain (FSMC). Based on this FSMC model, we then characterize the QoS performance at data-link-layer using the effective capacity approach, which turns out to be critically important for the statistical QoS guarantees over wireless links in mobile networks. We also investigate the impact of physical-layer power control and channel-state information (CSI) feedback delay on the QoS performance. The numerical results obtained demonstrate that our proposed cross-layer model can efficiently characterize the interactions between the physical-layer infrastructure and data-link-layer QoS performance. Index Terms Cross-layer design and optimization, mobile wireless networks, quality-of-service (QoS), effective capacity, adaptive-modulation-and-coding (AMC), multiple-input-multiple-output (MIMO), realtime multimedia delay-bound.