Code Placement and Replacement Strategies for Wideband CDMA OVSF Code Tree Management
IEEE Transactions on Mobile Computing
Non-blocking OVSF codes and enhancing network capacity for 3G wireless and beyond systems
Computer Communications
Dynamic assignment of orthogonal variable-spreading-factor codes in W-CDMA
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
OVSF code assignment strategies with minimal fragmentations for WCDMA systems
Computer Networks: The International Journal of Computer and Telecommunications Networking
Efficient integration OVSF code management strategies in UMTS
Computer Communications
Efficient OVSF code assignment strategy in UMTS with multiple codes
ACOS'06 Proceedings of the 5th WSEAS international conference on Applied computer science
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This paper presents an integrated solution to the code management and assignment problem in the UMTS system. We propose a new architecture for code management, and based upon this new architecture, a new code assignment strategy, referred to as 'crowded-group first strategy'. Our system architecture and code assignment strategy represent significant improvements in the time complexity and in the complexity of the storage operation. Moreover, the code blocking probability of the crowded-group first strategy can be as good as that of the crowded-first strategy. In order to systematically analyze the performance of the code assignment strategies, we implement a simulator to analyze the code selection behavior of each strategy, and the performance of the code blocking can be anticipated based on the analysis. We also propose a new performance metric, named 'weighted code blocking', in order to precisely measure the performance obtained by different strategies. From the simulation results, we show that our strategy efficiently utilizes the OVSF codes with the low computation overhead.