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Throughput Maximization in Multi-Carrier Wireless Networks with Predictive Link Adaptation
| Content Provider | Semantic Scholar |
|---|---|
| Abstract | Channel-aware scheduling and link adaptation methods are widely considered to be crucial for realizing high data rates in wireless networks. Although it is desirable to adapt the transmission parameters according to the channel state information to capture even small-scale variations, there are practical limitations to frequent link adaptation. While many aspects of scheduling transmissions over time-varying wireless channels have been studied, the penalty induced by link adaption has not been considered. Moreover, predicting the future channel quality may also consume significant amount of system resources (e.g., time, bandwidth and power). Naturally, the additional cost and complication of predicting channel state and link adaptation increases with the desired prediction accuracy. This paper considers the problem of maximizing throughput in a multi-carrier wireless network that employs predictive link adaptation. The contributions of this paper are two-fold. Firstly, we explicitly consider the time-penalty induced by the transmission-mode changes in the scheduling problem. Secondly, we study the trade-offs between the channel-state prediction quality and the throughput. Several deterministic algorithms (offline and online) are first developed, and based on these, heuristic algorithms are developed to accommodate the model when the estimate for a future channel is different from the actual one. Our results show that a modest consumption of resources for channel prediction and link adaptation may result in a significant throughput improvement, with only marginal gains through further enhancement of the prediction quality. The results presented in this paper can provide meaningful guidelines in deciding what level of system resource consumption is justified for channel quality estimation and link adaptation. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.seas.gwu.edu/~hchoi/publication/wireless/mobicom.pdf |
| Alternate Webpage(s) | https://www.seas.gwu.edu/~hchoi/publication/wireless/mobicom.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
