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为了提高WCDMA(wideband code divisionmultiple access)系统中高优先级业务的接入率,提出一种基于优先级的抢占式OVSF(orthogonal variable spreadingfactor codes)码动态分配算法。该算法中,当新的高优先级业务呼叫到达时,若出现容量阻塞,则中断代价最小的低优先级业务,并将其占用的码字分配给高优先级业务;若出现码阻塞,则选择代价最小的码树进行码字重分配。应用MATLAB软件完成的仿真结果表明:在高负载的情况下,与传统动态码分配算法相比,本算法中高优先级业务的接入率能提高20%以上,同时算法保证了低的中断业务数和重分配码数,能良好地支持业务的QoS(quality of service)要求。
In order to improve the access rate of high priority services in WCDMA (wideband code division multiple access) system, a preemptive OVSF algorithm based on priority is proposed. In this algorithm, when a new high-priority service call arrives, if there is capacity congestion, the lowest-cost low-priority service is interrupted and the code words it occupies are allocated to high-priority services. If there is a code congestion, Select the code tree with the lowest cost for code word redistribution. The simulation results using MATLAB software show that in the case of high load, compared with the traditional dynamic code allocation algorithm, the access rate of the high-priority service in the algorithm can be increased by more than 20%, and the algorithm ensures the low interrupt service number And the number of re-allocated code, can well support the business of QoS (quality of service) requirements.