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Optimal Traffic Splitting Policy in LTE-based Heterogeneous Network
Dual Connectivity (DC) is a technique proposed to address the problem of
increased handovers in heterogeneous networks. In DC, a foreground User
Equipment (UE) with multiple transceivers has a possibility to connect to a
Macro eNodeB (MeNB) and a Small cell eNodeB (SeNB) simultaneously. In downlink
split bearer architecture of DC, a data radio bearer at MeNB gets divided into
two; one part is forwarded to the SeNB through a non-ideal backhaul link to the
UE, and the other part is forwarded by the MeNB. This may lead to an increase
in the total delay at the UE since different packets corresponding to a single
transmission may incur varying amounts of delays in the two different paths.
Since the resources in the MeNB are shared by background legacy users and
foreground users, DC may increase the blocking probability of background users.
Moreover, single connectivity to the small cell may increase the blocking
probability of foreground users. Therefore, we target to minimize the average
delay of the system subject to a constraint on the blocking probability of
background and foreground users. The optimal policy is computed and observed to
contain a threshold structure. The variation of average system delay is studied
for changes in different system parameters.Comment: Conferenc
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