The Research On Handoff And Dynamic Resource Scheduling In Mobile Networks

Mobile cellular radio systems have been attracting great interests of industry and researchers recently. This thesis deals with two major issues in the systems, namely handoff scheme and resource scheduling. A new flexible handoff schemes for the multi-service-types mobile cellular systems is proposed and analyzed. Meanwhile, a class-based priority queuing policy for dynamic resource scheduling is proposed aiming at resource scheduling of wireless channel in WCDMA which is mainstream technology of 3GAfter brief introduction of mobile cellular systems and relevant research situations, handoff schemes are specified. At the same time, forthcoming handoff schemes include non-priority, resource reservation and reservation-based improvement schemes.After research of those algorithms, a channel assignment and handoff strategy for multimedia mobile cellular communication systems are designed. It gives handoffs "grab priority" and "channel reservation". Otherwise, it gives new calls considerable "grab priority" to increase system capacity. The distributed channel number of various calls will change with the change of system intensity. Meanwhile, to guarantee lowest QoS requirements of various calls, it provision minimal channels for every call. The strategy is modeled and analyzed using a multi-dimensional Markov chain. Important performance measures are obtained. Numerical analysis shows that good QoS can be obtained using the channel allocation and handoff strategy proposed.Meanwhile, a class-based priority queuing policy for dynamic resource scheduling for wireless channel resources scheduling in WCDMA is designed. And WCDMA system resource scheduling model is established. Then this thesis analyses and explains each function module. Analysis shows that class-based scheduling satisfied QoS requirements of WCDMA systems.Finally, it concludes the thesis briefly. Future directions of the study are also outlined.