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A significant problem that deteriorates the performance of 3G W-CDMA systems is code blocking. The complete elimination of this phenomenon is accomplished only if a code reassignment procedure is employed. However, the relatively high total signaling delay for a single OVSF code reassignment combined with the strict delay requirements of some services makes the reassignment of some OVSF codes impractical. In other words, that a reassignment procedure cannot always be performed and therefore code blocking cannot be eliminated. In this paper, we introduce a new code selection scheme, named Delay Sensitivity Based Assignment (DSBA), which takes into account the different delay requirements of the incoming calls. The performance of the proposed scheme is evaluated through event driven simulation and the results show a significant decrease in code blocking probability, especially for high rate calls, compared to other previously proposed schemes.

Delay Sensitivity Based Assignment of OVSF Codes for the Downlink DCH in WCDMA