Abstract: Aiming at Orthogonal Frequency Division Multiple Access(OFDMA) system, an improved admission control algorithm for multi-service is proposed in this paper. The system provides a number of sub-carriers for the transmission, compressing the channel bandwidth or the transmission rate, reducing the Quality of Service(QoS) of the service on the original channel, and the number of available channel in the cell can be raised. Simulation result shows that the algorithm can improve the channel resources utilization and reduce the call blocking probability which comes from the handover call and new call, compared with the conditional channel reservation algorithm.

Key words: Orthogonal Frequency Division Multiple Access(OFDMA), multi-services, handover call blocking probability, new call blocking probability, priority, call access control

摘要： 提出一种针对分析正交频分多址接入(OFDMA)系统的改进多业务接入控制算法。OFDMA系统为用户提供一定数量的子载波进行传输，通过压缩原信道带宽或传输速率，降低原信道上的业务服务质量，从而提高小区内可使用的信道数量。仿真结果表明，与传统信道预留算法相比，该算法可提高信道资源利用率，降低目标小区的切换呼叫阻塞率和新呼叫阻塞率。

关键词: 正交频分多址接入, 多业务, 切换呼叫阻塞率, 新呼叫阻塞率, 优先级, 呼叫接入控制

CLC Number: 

• TN92