【作者】 朱立东；

【导师】 吴诗其；

【作者基本信息】 电子科技大学 ， 通信与信息系统， 2002， 博士

【摘要】 随着移动通信的发展，移动通信用户数和Internet用户数急剧增加，人们期望新一代移动通信系统不仅具有更大的容量，还要支持移动多媒体业务，除了提供话音业务外，还支持低/高速数据、图象等非话音业务的传输。不同业务有不同的服务质量（QoS）要求，如对时延、误比特率、数据速率的要求不同。无线蜂窝网络设计有两大目标：一是保证各类业务的QoS要求，二是使网络的资源利用率达到最大，这需要借助于无线资源管理。对于FDMA/TDMA系统，无线资源管理相对简单，只需对频率、时隙进行合理的分配，而CDMA系统的资源管理要复杂得多。第三代移动通信系统选用CDMA作为空中接口的主要候选方案，由于CDMA系统是自干扰系统，其容量受干扰的限制，需要合理地分配系统的资源。第三代移动通信系统的无线资源管理主要包括呼叫允许控制、切换控制、功率控制、负荷控制、分组调度等。本文重点研究了多媒体移动通信系统的呼叫允许控制、切换控制、功率控制以及负荷控制等。 第二章提出了多业务蜂窝移动通信系统的一种基于资源预留和切换排队的呼叫允许控制策略，除了给切换呼叫预留资源外，还分别为实时业务和非实时业务的切换呼叫设置了缓冲器，并给予实时业务的切换呼叫更高的接入优先权。该策略与只有资源预留的呼叫允许控制策略相比，降低了切换呼叫的切换失败概率，而新呼叫的阻塞概率变化不明显，从而改善了系统的性能。 第三章提出了多媒体CDMA系统的一种基于自适应干扰门限的呼叫允许控制策略，与固定干扰门限的呼叫允许控制策略相比，显著改善了系统的性能。 第四章提出了WCDMA系统的一种基于切换排队的呼叫允许控制策略，与无切换排队的呼叫允许控制策略相比较，在新呼叫阻塞概率无明显增加的前提下，显著降低了切换呼叫的阻塞概率。 第五章对多业务CDMA蜂窝移动通信系统的软切换进行了研究，分析了系统性能与有效集增加门限、有效集删除门限的关系，对呼叫中断概率和软切换率与有效集增加门限、有效集删除门限的关系作了相应的仿真，得到了有效集增加门限、有效集删除门限的合理取值。 第六章提出了多业务CDMA蜂窝移动通信系统的一种下行链路功率控制策略，系统的最优功率分配可以归结为求解归一化链路增益矩阵在有约束条件下的最大实特征值。与固定发射功率策略比较，大大降低了呼叫中断概率，同<WP=11>时减小了系统干扰，从而提高系统的容量。 第七章对无线蜂窝CDMA数据通信系统的功率控制进行了研究，针对数据业务的非实时性和可以重传的特点，提出了一种基于净效益（有代价函数）的功率控制策略，与基于效益（无代价函数）的功控策略相比，可以显著增加移动终端的效益，降低终端的发射功率，从而延长终端的通信时间。 第八章研究了多业务CDMA系统的负荷控制，首先对系统的上、下行链路负荷进行估计，并采取呼叫接入控制策略，以保证激活用户的QoS要求。 第九章是全文总结，并指出今后需要进一步研究的工作。更多还原

【Abstract】 With the development of mobile communications, mobile users and Internet users are increasing dramatically. People expect that next generation mobile communication systems can provide larger capacity and support mobile multimedia services. Besides providing real-time speech service, next generation mobile communication systems are required to support non real-time services such as low/high rate data, pictures etc. Heterogeneous services have different quality of service (QoS) requirements, for example, the requirements of time delay, error bit rate, and transmission rate for heterogeneous services are differentiated. There are two main objects for wireless network design, one is to guarantee QoS requirements of heterogeneous services, and the other is to make resource utilization maximized. This recurs to radio resource management (RRM). RRM for FDMA/TDMA systems is relatively simple and just needs to assign frequency and time slots properly, while RRM for CDMA systems is much more complex. Code division multiple access is key candidate project of air interface for the third generation mobile communication systems. CDMA system is a self-interfered one, the capacity of which is limited by co-channel interference. It’s necessary to assign system resources reasonably. Radio resource management for the third generation mobile communication systems includes call admission control, handoff control, power control, load control and packet scheduling. This dissertation pays attention on call admission control, handoff control, power control and load control for mobile multimedia communication systems. Chapter 2 proposes a resource reservation and handoff queuing-based call admission control policy for multi-services wireless cellular mobile system. In addition to reserve resource for handoff call, different sized buffers are set for handoff calls of real-time and non real-time services respectively, and higher priority is given to handoff call of real-time services. Compared with call admission control with resource reservation, this policy reduces handoff failure probability evidently, while new call’s blocking probability is hardly changed.Chapter 3 proposes an adaptive interference threshold-based call admission<WP=13>control for multimedia CDMA system. Compared with fixed interference threshold-based call admission control, this policy improves the system performance.Chapter 4 proposes a handoff queuing-based call admission control strategy for WCDMA system. Compared with call admission control without handoff queuing, this strategy improves the system performance with lower handoff call blocking probability. Chapter 5 studies soft handoff in multi-service CDMA systems, analyses relationship between system performance and active set add threshold and delete threshold, and gives simulation results accordingly, finally reasonable values for active set add and delete threshold are obtained. Chapter 6 proposes a downlink power control scheme for multi-service CDMA cellular mobile communication system. Optimal power allocation for the system can be considered as getting the maximum real eigenvalue of the normalized link gain matrices with constrained conditions. Compared with power control with fixed transmission power, this scheme reduces call outage probability and interference, thus improves the system capacity. Chapter 7 studies power control for wireless cellular CDMA data communication systems. In allusion to data’s non real-time characteristic and retransmission mechanism, a net utility-based power control scheme (which considers price function) is proposed. Compared with utility-based power control (which considers no price function), the former increases mobile’s utility, reduces mobile’s emission power, and thus extends mobile’s session time and improves the system capacity. Chapter 8 studies load control for multi-services CDMA mobile cellular communication systems. Loads are estimated firstly for uplink and downlink separately, and then corresponding call admission control policy is p更多还原