Radio resources allocation for decentrally controlled relay stations |
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Authors: | Pavel Mach Robert Bestak |
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Affiliation: | (1) Faculty of Electrical Engineering, Department of Telecommunications Engineering, Czech Technical University in Prague, Prague, Czech Republic |
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Abstract: | To enhance throughput and to extend coverage of wireless networks based on IEEE 802.16 standards, relay stations can be implemented.
The crucial point influencing the overall system performance is allocation of appropriate amount of resources to individual
relay stations depending on their current needs. If resources are not allocated properly, relay stations can experience congestion
situations resulting in system throughput decrease and packet delays increase. If the base station is enhanced purely by centrally
controlled relay stations, the base station itself is able to dynamically schedule data transmissions of its relays. Nevertheless,
decentrally controlled relays schedule data for its users on its own and the base station is no longer capable to allocate
the right amount of radio resources for them. The decentrally controlled relays have to ask for radio resources by means of
existing scheduling services defined in IEEE 802.16 standard. While utilization of the conventional unsolicited grant service
decreases the system capacity, the use of real-time polling or extended real-time polling services results in higher signaling
overhead and longer packet delays. In order to maximize system throughput and to minimize packet delays and signaling overhead,
we suggest a mechanism that pre-allocates to decentrally controlled relay stations a certain amount of default radio resources
while the remaining resources are dynamically shared. The obtained results show that for low traffic load, overhead and packet
delays are significantly smaller as relays do not have to ask base stations for resources. On the other hand, at heavy traffic
load the system throughput slightly decreases whereas packet delays and signaling overhead are still significantly smaller. |
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