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We consider in-band self-backhauling for small cell 5G systems. In-band self-backhauling enables efficient usage of frequency resources. When coupled with a flexible frame format, it also enables efficient time-division duplexing of uplink, downlink, and backhaul transmissions. Self-backhauling is particularly efficient when coupled with FD relaying. Antenna design, as well as cancellation in radio...
We consider utility maximization in a multi-cell network under a total transmit power constraint, e.g. given by a cognitive radio geo-location database. The network utility in the downlink is maximized by allocating transmit powers in the network, while meeting the network-wide transmit power constraint. Distributed algorithms for allocating downlink transmit power are discussed, which involve exchange...
We calculate the optimal muting ratio for time domain Enhanced Inter-Cell Interference Coordination (TDM eICIC) in a downlink HetNet scenario, consisting of macrocell and femtocell users. First we derive analytically the optimal muting ratio in a simplified scenario, and identify a particular case where all macro users are either strongly or not at all affected by the presence of femtocells. In this...
Local area deployments in general and femtocells in particular have proved to be an effective solution for providing ubiquitous coverage in a cost-efficient manner, satisfying the high data rate and QoS requirements for LTE-Advanced systems. In this paper, we investigate inter-cell interference management schemes for dense local area deployments. We propose a distributed capacity based channel allocation...
Network synchronization is a requirement for a time division duplex (TDD) femtocell network to prevent multi-access and inter-slot interference. Network Listening (NL) is a technique used for network synchronization where a base station (BS) is synchronized directly with another BS over-the-air, based on BS-BS measurements. Spanning tree based NL is the recommended technique for a local area indoor...
We consider distributed Inter-Cell Interference Coordination based on rate splitting and interference cancellation. Link adaptation is performed based on Channel Quality Information both on the desired link and on links towards interference victims. A transmitted message is split into a private and a public part. The private part is decodable only by the intended receiver, whereas the public part...
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