Apparatus and method for allocating channel using ovsf code for uplink synchronous transmission scheme in a w-cdma communication system

摘要

Disclosed is a channel allocation method in a CDMA communication system. The method comprises receiving from a UTRAN one SF node C_SF,k out of 2^m-1 SF nodes (where m is an integer larger than 3) arranged in the form of a tree having a mother node and child nodes; searching a group including the received SF node C_SF,k in accordance with Formula (1) below; spreading a signal on a dedicated physical data channel (DPDCH) with an OVSF code corresponding to a selected one of the received SF node and its child nodes in the searched group; and spreading a signal on a dedicated physical control channel (DPCCH) with an OVSF code corresponding to an SF node determined by Formula (2) below based on the received SF node. $\begin{array}{cc}\mathrm{For}\mathrm{SF}<=\frac{2^{m-1}}{4},\left(P_1.\mathrm{SF},P_1.k\right)=\left(\frac{2^{m-1}}{4},n\right)\mathrm{For}\mathrm{SF}>\frac{2^{m-1}}{4},\left(P_2.\frac{2^{m-1}}{4},P_2.n\right)=\left(\mathrm{SF},k\right)\mathrm{where},P_1=\frac{2^{m-1}}{4.\mathrm{SF}}\mathrm{and}{P}_2=\frac{4.\mathrm{SF}}{2^{m-1}}.& \text{Formula (1)}\\ F\left(C_{\frac{2^{m-1}}{4}.k}\right)=C_{2^{m-1}{2}^{m-1}-k-1}(k=0,1,\mathrm{...})F\left(C_{\frac{2^{m-1}}{4}.k}\right)=C_{2^{m-1},2^{m-1}-\left(k-32\right)}(k=0,1,\mathrm{...}).& \text{Formula (2)}\end{array}$