[[Image:cdma21.jpg|thumb|700px|center|Rate matching algorithm by SEIMENS]]
[[Image:CDMACdma1.JPG|thumb|center|700 px|CDMA Basics]] [[Media:Cdma_talk.pdf|CDMA basics]]
===QoS Management Algorithms===
Quality of Service can be managed according to the varying type of traffic i.e. data, voice, video in the following four ways.
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===Code Hopping Algorithm===
According to one of the methods of dynamic power control (Code Hopping) used in W-CDMA technology, the Rate Information (RI) field in the uplink control channel in W-CDMA frame can be used to notify the base station about the variable bit rates (VBR) it wants to send, then the base station assigns a new spreading factor for each data rate and hence the optimal power calculation is done according to the spreading factor as follows.<br> Spreading factor(Gi) is defined as the ratio of bandwidth of the system to the data rate of the radio frame.
[[Image:CDMA_-_3D.JPG|center|thumb|500 px|Graph showing number of publications by the publishers during 1991-2003]]
==Conclusion==
Substantial amount of research has been done in the field of QoS in CDMA communication system in the year 1998-99 and this has led to the invention of multitude of methodologies ranging from power control to Rate matching and Dynamic Resource scheduling, all with the sole aim of improving QoS.
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