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On the Impact of Control Channel Reliability on Coordinated Multi-Point Transmission

Zoltán Mayer (Institutionen för signaler och system) ; Jingya Li (Institutionen för signaler och system, Kommunikationssystem) ; Agisilaos Papadogiannis (Institutionen för signaler och system, Kommunikationssystem) ; Tommy Svensson (Institutionen för signaler och system, Kommunikationssystem)
EURASIP Journal on Wireless Communications and Networking (1687-1472). Vol. 28 (2014),
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Coordinated multi-point (CoMP), heterogeneous networks (HetNet), backhaul reliability, control channel, link failure probability

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Denna post skapades 2014-01-22. Senast ändrad 2015-03-30.
CPL Pubid: 192963


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Mobile and wireless communications Enablers for Twenty-twenty (2020) Information Society (METIS) (EC/FP7/317669)