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This chapter presents the functional blocks and interfaces of long term evolution/evolved packed core (LTE/EPC). The new architecture is illustrated with comparisons of solutions with earlier mobile communications systems. The LTE/system architecture evolution (SAE) system consists of several interfaces internally and between the other 3rd Generation Partnership Project (3GPP) 2G/3G networks. The...
In this paper we study uplink open loop power control (OLPC) optimization for co-channel Heterogenous Network (HetNet) scenarios with macro and pico cells under fractional load conditions. Two methods for automatic OLPC optimization are proposed, motivated and compared against manual approach. It is found that the OLPC parameters at the pico-layer can be computed as a function of the OLPC parameters...
Open Loop Power Control is an important technique providing adaptation of user transmit power. There are multiple factors like cell size, interference conditions, etc. that determine the optimal settings of power control (PC) parameters. In this paper, the impact of open loop PC parameter settings on the performance of LTE uplink (UL) in a co-channel heterogeneous network (HetNet) scenario with macro-...
Different technical solutions and innovations are enabling the move from macro-only scenarios towards heterogeneous networks with a mixture of different base station types. In this article we focus on multi-layer LTE-Advanced networks, and especially address aspects related to interference management. The network controlled time-domain enhanced inter-cell interference coordination (eICIC) concept...
This paper is focused on interference mitigation for LTE-Advanced multi-layer networks with macro and HeNBs. The autonomous HeNB power setting in the downlink is studied for different HeNB access methods. Our studies show that using the so-called escape carrier configuration and autonomous HeNB power setting is a promising strategy for enabling gradual introduction of user-deployed HeNBs in existing...
One example of heterogeneous networks include deployment of outdoor low power pico eNBs in existing macro-layer networks. Placing these within the coverage area of macro eNBs introduce several challenges in terms of assuring low interference levels while at the same time improving the performance of the users. In this paper we focus on the comparison between three main frequency reuse schemes: Co-Channel,...
This paper provides an assessment of 3GPP standardized LTE/LTE-A uplink power control procedures in case of a co-channel operation of different types of base stations. Especially the case of femtocell deployment with an overlaying macrocell is considered. Imperfections of the currently accepted procedures in case of such networks are pointed and a modified solution is proposed. It is shown that in...
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