CDMA2000系统反向链路中一种改进的速率控制算法
doi: 10.3724/SP.J.1146.2006.00714
A Modified Rate Control Algorithm for the Reverse Link in CDMA2000 Systems
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摘要: 该文针对CDMA系统反向链路中两种传统的速率分配算法，即调度算法(SCH)和专用速率控制算法(DRC)的优缺点，提出了一种改进的DRC算法：多步上升速率控制算法(MUDRC)。新算法在保留DRC算法优点的同时，克服了DRC算法慢启动的缺点,使得移动台(MS)在某些情况下可以一次提高多个速率等级。仿真结果表明，MUDRC算法可以在有效利用系统资源的同时，一定程度上提高用户的时延性能。与传统的DRC算法相比，MUDRC算法的前反向开销没有增加，这些开销远小于调度算法。该算法可以用于其他使用速率控制算法的通信系统中。
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关键词:
- 调度;速率控制;时延;开销
Abstract: This paper focuses on the rate allocation algorithms on the reverse link (RL) of CDMA2000 system. Two conventional algorithms, the SCHedule (SCH) algorithm and the Dedicated Rate-Controlled (DRC) algorithm are compared and analyzed. Based on their pros and cons, a modified version of DRC algorithm is proposed, which is called Multi-step-Up DRC (MUDRC). While holding the advantages of DRC，the proposed algorithm can combat for the inherent slow ramp-up nature of DRC and enable a mobile to increase its rate by multiple steps when needed. Simulation results show that the proposed algorithm can efficiently utilize the radio resources and improve the users performance of delay. In addition, the performance gain is achieved by using the same amount of signaling overhead as that of DRC, which is much less than that of SCH. The proposed scheme can be generalized to other similar communication systems. -
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