In UL transmiter has 6 codes in total( 6 branches that will be combined and IQ modulated ) . In case of 5.7 Mbps 4 are occupied by edch, one for hsdpch and one for ul srb(dch). So no need to use srbohspa from my point of view. But it could be that less power remained for edch id r99 srb is in place. That can reduce throughput.And also in case amr+hsupa the same is the case.
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