Analysis of throughput and delay in multimedia CDMA networks with relaying

Relaying in cellular networks is being researched extensively towards increasing the coverage and throughput of a cellular system. However it is, often difficult to meet the QoS constraints set by the nodes using relaying. In this paper, we analyse an important QoS parameter, the delay due to relaying information via an intermediate node to the base station. The reverse link of a single cell time-slotted CDMA is considered. The delay for nodes using direct communication is compared, with that of nodes using relay communication for various offered traffic and throughput. The average delay for nodes using relaying is at least 1.5 slot-times higher than the average delay for the nodes using direct communication. Also when compared with that of the direct communication, the throughput increases with the use of relaying, confirming earlier research. Thus this paper draws attention to the significant effects, relaying has on delay and throughput in a cellular network. The results presented here provide a basic framework for clear understanding of this impact.