Rearrangeable compact assignment of OVSF codes for multi-rate traffic

摘要

In UTRA systems, orthogonal variable-spreading-factor (OVSF) codes are used to support different transmission rates for different users. In this paper, we first define an index for measuring the flexibility of an assignable code set. Based on this flexibility index, a single-code assignment scheme, namely rearrangeable compact assignment (RCA), is proposed for accommodating multi-rate traffic. RCA can offer maximal flexibility to the resulting assignable code set after each code assignment. Analytical and simulation results show that RCA is efficient, stable and fair.