Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Code Placement and Replacement Strategies for Wideband CDMA OVSF Code Tree Management
IEEE Transactions on Mobile Computing
Maximally flexible assignment of orthogonal variable spreading factor codes for multirate traffic
IEEE Transactions on Wireless Communications
Non-blocking OVSF codes and enhancing network capacity for 3G wireless and beyond systems
Computer Communications
Multiple OVSF codes assignment with crowded branch first strategy in WCDMA systems
ICCOM'07 Proceedings of the 11th Conference on 11th WSEAS International Conference on Communications - Volume 11
Efficient integration OVSF code management strategies in UMTS
Computer Communications
OVSF Code Sharing and Reducing the Code Wastage Capacity in WCDMA
Wireless Personal Communications: An International Journal
MDP-based CAC for two-dimension spreading VSF-OFCDM in 4G cellular communications
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Efficient OVSF code assignment strategy in UMTS with multiple codes
ACOS'06 Proceedings of the 5th WSEAS international conference on Applied computer science
Graph model for optimal OVSF code placement strategies
International Journal of Ad Hoc and Ubiquitous Computing
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This paper presents an integrated solution for code management, assignment, and reassignment problems in UMTS. We propose a new architecture for code management and, based upon this new architecture, a code assignment strategy, referred to as "crowded-group first strategy.” Our system architecture and code assignment strategy represent significant improvements both in the time complexity and the maintenance complexity. Moreover, the code blocking probability of the crowded-group first strategy is competitive to that of the other strategies. In this paper, we also propose a new code reassignment strategy, called the "crowded-branch first strategy.” The main objective of this reassignment strategy is to reduce reassigned call probability with low computation overhead and extend this strategy for the general case. In order to systematically analyze the performances of the code assignment strategy, we implement a simulator to analyze the code selection behavior and code blocking probability of each strategy. Moreover, we propose some new performance metrics, named "weighted code blocking,” "reassigned call probability,” and "ratio of actual code reassignments,” in order to precisely measure the performance obtained by different strategies. From the simulation results, we show that our proposed strategies efficiently utilize the OVSF codes with low computation overhead.