Abstract
We develop a model for decentralized opportunistic transmissions of a finite (n) user slotted Aloha system that relies on decentralized channel state information (D-CSI). D-CSI refers to each user node having access only to its own uplink channel gain. Every user adapts both rate and re-transmission probability to D-CSI in every slot. Due to the variable transmission rate from slot to slot, incoming packets with fixed length are re-assembled to deliver as many bits as possible per slot. By modeling the number of bits in queues as a discrete Markov chain, we analyze the stability region and the maximum stable throughput (MST). In addition, we derive a decentralized opportunistic scheme and show that it achieves a fraction (1 - 1/n)n-1 of its centralized counterpart's throughput, where (1 -1/n)n-1 is a factor due to the inherent contention in random access.
| Original language | English (US) |
|---|---|
| Pages | 3332-3336 |
| Number of pages | 5 |
| State | Published - Dec 1 2004 |
| Event | GLOBECOM'04 - IEEE Global Telecommunications Conference - Dallas, TX, United States Duration: Nov 29 2004 → Dec 3 2004 |
Other
| Other | GLOBECOM'04 - IEEE Global Telecommunications Conference |
|---|---|
| Country/Territory | United States |
| City | Dallas, TX |
| Period | 11/29/04 → 12/3/04 |
Keywords
- Adaptive Transmission
- Decentralized Channel State Information
- Maximum Stable Throughput
- Multiuser Diversity
- Slotted Aloha