Title :
Performance evaluation of orthogonal variable-spreading-factor code assignment schemes based on UMTS/IMT-2000 in W-CDMA
Author :
Assarut, Rujipun ; Kawanishi, Ken´ichi ; Yamamoto, Ushio ; Onozato, Yoshikuni
Author_Institution :
Dept. of Comput. Sci., Gunma Univ., Kiryu, Japan
Abstract :
This paper compares the performance of the orthogonal-variable-spreading-factor (OVSF) code assignment schemes based on UMTS/IMT-2000 proposed so far, i.e., the conventional code assignment scheme (CONV), the dynamic code assignment scheme (DCA), and region division assignment scheme (RDA). It was shown that RDA gives better performance than DCA and CONV in terms of the packet dropping probability under heavy traffic conditions. In this paper, we make extensive performance comparisons among the three proposed OVSF code assignment schemes. We focus on two performance measures, i.e., the number of simultaneous voice conversations and the calculation time. The simulation results show that the calculation time of RDA is significantly lower than that of DCA. RDA can simultaneously handle much more voice sources than DCA.
Keywords :
3G mobile communication; code division multiple access; probability; spread spectrum communication; telecommunication congestion control; telecommunication traffic; voice communication; CONV; DCA; OVSF; RDA; UMTS/IMT-2000; W-CDMA; conventional code assignment scheme; dynamic code assignment scheme; heavy traffic; orthogonal variable-spreading-factor code assignment; packet dropping probability; performance evaluation; region division assignment scheme; simultaneous voice conversations; 3G mobile communication; Computer science; Intserv networks; Multiaccess communication; Multimedia communication; Multimedia systems; Time measurement; Traffic control; Tree data structures; Wideband;
Conference_Titel :
Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th
Print_ISBN :
0-7803-7467-3
DOI :
10.1109/VETECF.2002.1040483