Mobile cloud computing (MCC)
improves the computational capabilities of resource constrained mobile devices.
On the other hand, the mobile users demand a certain level of
quality-of-service (Quos) provisioning while they use services from the cloud,
even if the interfacing gateway changes due to the mobility of the users. In
this paper, we identify, formulate, and address the problem of Quos-guaranteed
bandwidth shifting and redistribution among the interfacing gateways for
maximizing their utility. Due to node mobility, bandwidth shifting is required
for providing Quos-guarantee to the mobile nodes. However, shifting alone is
not always sufficient for maintaining Quos-guarantee because of varying
spectral efficiency across the associated channels, coupled with the
corresponding protocol overhead involved with the computation of utility. We
formulate bandwidth redistribution as a utility maximization problem, and solve
it using a modified descending bid auction. In the proposed scheme, named as
AQUM, each gateway aggregates the demands of all the connecting mobile nodes
and makes a bid for the required amount of bandwidth. We investigate the
existence of Nash equilibrium (NE) in the proposed solution. Theoretically, we
deduce the maximum and minimum selling prices of bandwidth, and prove the
convergence of AQUM. Simulation results establish the correctness of the
proposed algorithm.
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