ssignment dynamically based on the channel quality and on the supportable payload of a user. With a dynamic approach, each user is allocated the amount of transmission resources that is neces- sary to reach the target BLER. This can be estimated by the link adaptation unit based on the reported channel quality indicator (CQI) and the selected modu- lation and coding scheme (MCS). With the dynamic approach, the size of the resource allocation matches more accurately to the requirements of the user. Thus the same total amount of transmission resources can be used more efficiently, which increases the resource utilization efficiency. Moreover, weak users can be boosted with a higher share of transmission resources, which also improves the DL coverage of the VoIP service. The impact of the used resource allocation algorithm to the VoIP system per- formance on HSDPA was studied in [14]. The results indicated that the dynamic resource allocation on top of the VoIP-optimized scheduling provides substantial (up to 20%) capacity gain over the even-share approach. © 2009 by Taylor & Francis Group, LLC Radio Access Network VolP Optimization 10.4.3 Utilization of VolP-Specific Packet Scheduling (PS) Algorithm Perhaps the most essential building block for the efficient support of VoIP traffic in HSPA/LTE is the packet scheduling (PS) algorithm. This algorithm at (e)NodeB is responsible for user selection and the resource allocation for the selected users. Considering VoIP traffic characteristics, the PS buffer status, and individual users' channel conditions when making scheduling decisions and resource allocation for the selected users, VoIP capacity can be boosted up to 115% [14] when compared to the blind Round Robin (RR) scheduling method without any VoIP specific user prioritization. In this section, a brief description of the proposed VoIP optimized PS algorithm is given (details on the algorithm and corresponding performance analysis on HSDPA and LTE are given in [7,14-16]). Moreover, it is assumed that the proposed al