Quota-based Dynamic Network Selection for Multi-mode Users
Date Issued
2011
Date
2011
Author(s)
Yang, Chih-Hui
Abstract
Due to the fact that it is difficult to deploy base stations (BSs) in a region with high population density, an operator usually co-locates various networks in a BS and serves users’ demands simultaneously with those networks. Existing 3.5G data cards usually select networks with the highest physical data rate as their priority choices such that the radio resources may not be efficiently and equally utilized in a multiple network environment, even when the network with the highest rate is already congested.
In this thesis, we therefore propose a dynamic network selection algorithm via a quota-based admission control design for accommodating access requests in a multi-network (HSPA+, HSDPA and UMTS) co-location environment, which is common for today’s 3G operators. In most commercial networks, the accesses of individual users are often charged at a flat rate. In such a charging scheme, a few extremely heavy users may degrade the performance and the fairness of the whole network. As a result, we propose an algorithm called Quota-based Utilization Balance Algorithm (QUBA), designed to settle such a problem and also maximize the overall utility of all users. The design philosophy of QUBA is to let the system utilization in the 2 fastest networks, HSPA+ and HSDPA, be statistically balanced and sufficiently utilized. Performance metrics in terms of the overall system utility (i.e., the satisfaction index), the blocking probability, and the system utilization are investigated. From simulation results, it is shown that the QUBA algorithm has significant
Subjects
dynamic network selection
resource allocation
quota
HSPA+
HSDPA
Type
thesis
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