TY - JOUR
T1 - On the throughput of multi-source multi-destination relay networks with queueing constraints
AU - Li, Yi
AU - Gursoy, M. Cenk
AU - Velipasalar, Senem
N1 - Funding Information:
This work was supported in part by the National Science Foundation CAREER Grant CNS-1206291 and in part by the National Science Foundation under Grant CNS-1302559, Grant CNS-1443966, and Grant ECCS-1443994.
Publisher Copyright:
© IEEE 2002-2012.
PY - 2016/8
Y1 - 2016/8
N2 - In this paper, the throughput of relay networks with multiple source-destination pairs under queueing constraints has been investigated for both variable-rate and fixed-rate schemes. When channel side information (CSI) is available at the transmitter side, transmitters can adapt their transmission rates according to the channel conditions, and achieve the instantaneous channel capacities. In this case, the departure rates at each node have been characterized for different system parameters, which control the power allocation, time allocation, and decoding order. In the other case of no CSI at the transmitters, a simple automatic repeat request (ARQ) protocol with fixed rate transmission is used to provide reliable communication. Under this ARQ assumption, the instantaneous departure rates at each node can be modeled as an ON-OFF process, and the probabilities of ON and OFF states are identified. With the characterization of the arrival and departure rates at each buffer, stability conditions are identified, and an effective capacity analysis is conducted for both cases to determine the system throughput under statistical queueing constraints. In addition, for the variable-rate scheme, the concavity of the sum rate is shown for certain parameters, helping to improve the efficiency of parameter optimization. Finally, through numerical results, the influence of system parameters and the behavior of the system throughput are identified.
AB - In this paper, the throughput of relay networks with multiple source-destination pairs under queueing constraints has been investigated for both variable-rate and fixed-rate schemes. When channel side information (CSI) is available at the transmitter side, transmitters can adapt their transmission rates according to the channel conditions, and achieve the instantaneous channel capacities. In this case, the departure rates at each node have been characterized for different system parameters, which control the power allocation, time allocation, and decoding order. In the other case of no CSI at the transmitters, a simple automatic repeat request (ARQ) protocol with fixed rate transmission is used to provide reliable communication. Under this ARQ assumption, the instantaneous departure rates at each node can be modeled as an ON-OFF process, and the probabilities of ON and OFF states are identified. With the characterization of the arrival and departure rates at each buffer, stability conditions are identified, and an effective capacity analysis is conducted for both cases to determine the system throughput under statistical queueing constraints. In addition, for the variable-rate scheme, the concavity of the sum rate is shown for certain parameters, helping to improve the efficiency of parameter optimization. Finally, through numerical results, the influence of system parameters and the behavior of the system throughput are identified.
KW - Broadcast channel
KW - buffer overflow
KW - decode-and-forward relaying
KW - effective capacity
KW - fixed-rate transmissions
KW - multiple-access channel
KW - statistical queueing constraints
KW - throughput
KW - variable-rate transmissions
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U2 - 10.1109/TWC.2016.2557332
DO - 10.1109/TWC.2016.2557332
M3 - Article
AN - SCOPUS:84982252349
SN - 1536-1276
VL - 15
SP - 5368
EP - 5383
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 8
M1 - 7457724
ER -