2 research outputs found
QoS and channel-aware packet bundeling for capacity improvement in cellular networks
We study the problem of multiple packet bundling
to improve spectral efficiency in cellular networks. The packet
size of real-time data, such as VoIP, is often very small. However,
the common use of time division multiplexing limits the number
of VoIP users supported, because a packet has to wait until it
receives a time slot, and if only one small VoIP packet is placed
in a time slot, capacity is wasted. Packet bundling can alleviate
such a problem by sharing a time slot among multiple users. A
recent revision of cdma2000 1xEV-DO introduced the concept
of the multi-user packet (MUP) in the downlink to overcome
limitations on the number of time slots. However, the efficacy
of packet bundling is not well understood, particularly in the
presence of time varying channels. We propose a novel QoS and
channel-aware packet bundling algorithm that takes advantage
of adaptive modulation and coding. We show that optimal
algorithms are NP-complete, recommend heuristic approaches,
and use analytical performance modeling to show the gains
in capacity that can be achieved from our packet bundling
algorithms. We show that channel utilization can be significantly
increased by slightly delaying some real-time packets within their
QoS requirements while bundling those packets with like channel
conditions. We validate our study through extensive OPNET
simulations with a complete EV-DO implementation.Supported in part by U.S. National Science Foundation under grant no. 072971
Quality of service and channel-aware packet bundling for capacity improvement in cellular networks
Title from PDF of title page, viewed on May 26, 2011VitaIncludes bibliographical references (p. 76-84)Thesis (Ph.D.)--School of Computing and Engineering. University of Missouri--Kansas City, 2011We study the problem of multiple packet bundling to improve spectral efficiency
in cellular networks. The packet size of real-time data, such as VoIP, is often very small.
However, the common use of time division multiplexing limits the number of VoIP users
supported, because a packet has to wait until it receives a time slot, and if only one small
VoIP packet is placed in a time slot, capacity is wasted. Packet bundling can alleviate
such a problem by sharing a time slot among multiple users. A recent revision of cdma2000 1xEV-DO introduced the concept of the multi-user
packet (MUP) in the downlink to overcome limitations on the number of time slots. However, the efficacy of packet bundling is not well understood, particularly in the presence of time varying channels. We propose a novel QoS and channel-aware packet bundling algorithm that takes advantage of adaptive modulation and coding. We show that optimal algorithms are NP complete
and recommend heuristic approaches. We also show that channel utilization can
be significantly increased by slightly delaying some real-time packets within their QoS requirements while bundling those packets with like channel conditions. We validate our
study through extensive OPNET simulations with a complete EV-DO implementation.Introduction -- Related work -- Background on wireless systems -- Multiple packet bundling -- Evaluation -- Conclusion