ABSTRACT
Contents 11.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336 11.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336 11.3 Classification of Resource Reservation Strategies . . . . . . . . . . . . . . . . . 337
11.3.1 Guard Channel-Based Strategies . . . . . . . . . . . . . . . . . . . . . . . . . 338 11.3.2 Threshold-Type Priority-Based Strategies . . . . . . . . . . . . . . . . 339
11.4 Modeling of Mobile Cellular Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . 340 11.4.1 System and Teletraffic Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340 11.4.2 Teletraffic Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341
11.4.2.1 GC-Based Strategy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341 11.4.2.2 TTP-Based Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343
11.4.3 Optimization of Control Parameter for Capacity Maximization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344
11.5 Recursive Formulas for the Performance Evaluation of Guard Channel-Based Strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344
11.6 Multi-Services Mobile Cellular Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . 345 11.6.1 Description of Multiple Resource Reservation
Strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346 11.6.1.1 GC-Based Strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346 11.6.1.2 TTP-Based Strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . 348
11.6.2 System and Teletraffic Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350 11.6.3 Teletraffic Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
11.6.3.1 GC-Based Strategy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351 11.6.3.2 TTP-Based Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 352 11.6.3.3 Approximate Analysis of the MLAFGC
Strategy through a One-Dimensional Recursive Formula . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353
11.7 Optimal Configuration of Admission Control Policies in Multi-Service Mobile Wireless Networks . . . . . . . . . . . . . . . . . . . . . . . 354
11.8 Performance Comparison and Numerical Results . . . . . . . . . . . . . . . . 355 11.8.1 Single-Service Scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355 11.8.2 Multiple Services Scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359
11.1 Overview Call admission control (CAC) strategies are required to guarantee that all service types meet their Quality-of-Service (QoS) requirements. The fractional reservation concept allows fine control of the communication service quality by varying the control parameter(s) (i.e., admission thresholds) of the CAC strategies by a fraction of one. This chapter begins with a classification, description, and analysis of fractional resource reservation strategies for handoff prioritization in cellular telecommunication systems with a single service type. The fractional reservation concept is considered in both guard channel (GC)-based and threshold-type priority-based strategies. Then, the generalization of these strategies for cellular systems with multiple service types is presented. A comprehensive comparative study addressing the advantages and disadvantages of each strategy is also included. Additionally, the teletraffic analysis for the performance evaluation of different resource reservation strategies is shown. Algorithms to maximize system capacity subject to QoS constraints are also described for several resource reservation strategies. The chapter also presents simple recursive formulas for the performance evaluation of the GC-based strategies.
