中文摘要：

未来无线多媒体网络将以分组技术为基础，支持多种业务的传输，业务的QoS保证将受到一定的挑战．各运营商也将针对自己所服务的对象特点，定义各类业务的QoS等级，来提供具有不同QoS要求的业务．因此，呼叫允许控制（Call Admission Control，CAC）策略将要以分组业务为主要对象，即既要在充分利用系统资源的基础上保证各业务的Q0s要求，又要适应各运营商之间的不同需求．因此本文提出一种新的对称CDMA系统中非对称业务下基于动态QoS保证的CAC策略．各运营商可根据自己的要求定义各业务的QoS等级．由于业务的不同特性，使得网络中上行链路和下行链路的业务呈现不对称性，为避免资源的浪费，将根据网络中的资源占有情况动态的地分配上行和下行链路中的资源．仿真结果表明，该策略可以自适应地保证各业务的QoS要求，提高了业务间的公平性和系统资源的利用率．

英文摘要：

Wireless multimedia network will be on the basis of the packet technology,support the transmission of multi-traftic,and accordingly cause the great challenge for the QoS guarantee. The operators will define the QoS of traffic according to their requirements, and provide the traffic with different QoS requirements. Call admission control will aim at the packet traffic, guarantee the different QoS requirements,and maximize the system utilization.In this paper,a novel QoS based CAC policy for the asymmetric traffic in symmetrical CDMA systems is proposed. The operators can define the priorities of all kinds of traffic according to their demands. And as the presence of asymmetric traffic in the wireless network, the channel resource should be assigned fairly and reasonably according to the working states. The free resource will be assigned to the traffic with higher priority. The simulation results show that this policy can guarantee the QoS of different traffic efficiently, and improve the resource utility significantly.