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Voice traffic bicasting enhancements in mobile HSPA network

This paper discusses methods for improving the effectiveness of delivering voice traffic over High-Speed Downlink Packet Access (HSDPA) network by employing transmission diversity with Single-Frequency Dual-Cell (SF-DC) Aggregation that is part of the Multiflow specification. SF-DC Aggregation allows the user to be served at the same time by two different cells. The enhancements discussed in the paper capitalize strongly on the availability of the composed Channel Quality Indication (CQI) feedback at both serving cells. According to the results obtained from the network simulations, the ability to select the better channel for each voice transmission significantly decreases the required transmission power of the cell, thus also improving the residual cell capacity available for best effort (BE) traffic. The required updates are completely software-based and are applied only in the access network, making them transparent to user terminal. Keywords—HSPA, Multiflow, SF-DC Aggregation, Bicasting, CSoHS, VoHS.