Abstract
In the heterogeneous networks (HetNets), co-channel interference is a serious problem. Coordinated multi-point (CoMP) transmission has emerged as a powerful technique to mitigate co-channel interference. However, all CoMP techniques rely on information exchange through reliable control channels, which are unlikely to be available in HetNets. In this paper, we study the effect of unreliable control channels, consisting of the access links and backhaul links, on the performance of CoMP. A control channel model is introduced by assigning link failure probability (LFP) to backhaul and access links for the cooperative clusters. Three CoMP architectures, namely the centralized, semi-distributed, and fully distributed are analyzed. We investigate the probability of deficient control channels reducing quality of service and impeding transmission. General closed form expressions are derived for the probability of a cooperative transmission node staying silent in a resource slot due to unreliable control links. By evaluating the average sum rate of users within a CoMP cluster, we show that the performance gains offered by CoMP quickly diminish, as the unreliability of the control links grows.
Highlights
Driven by the increasing popularity of connected devices in wireless communication systems, e.g., smartphones and tablets, mobile broadband traffic is growing rapidly
Motivated by the heterogeneous networks (HetNets) scenario, we evaluate the downlink of a cooperative wireless network and study the impact of control channel reliability on the system performance with different Coordinated multi-point (CoMP) techniques
We assume that the user equipment (UE) use orthogonal resource slots during channel state information (CSI) feedback; the outage probability of these uplink control channels can be evaluated in terms of the minimum signal-to-noise ratio, ρ0, that is required for successful transmission
Summary
Driven by the increasing popularity of connected devices in wireless communication systems, e.g., smartphones and tablets, mobile broadband traffic is growing rapidly. It is known that inter-cell interference can be overcome, if transmission nodes (TN) process signals in a cooperative manner [6] Such techniques are referred to as coordinated multi-point (CoMP) [7-9]. In this work, different transmission schemes are investigated under different CoMP network architectures [18-21], considering unreliable control channels. Backhaul links are assumed to be highly reliable, which are less likely to be available in the heterogeneous and future dense networks This is because the high number of access nodes would need to be accompanied by a proportionally high financial investment in order to build high quality wireline backhaul [22]. Motivated by the HetNet scenario, we evaluate the downlink of a cooperative wireless network and study the impact of control channel reliability on the system performance with different CoMP techniques. N refers to the set of natural numbers. |M| denotes the cardinality of the set M. represents the element-wise multiplication
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