A QoS Constrained Call Admission Control Algorithm in Voice/Data Integrated WCDMA Systems
Date Issued
2004
Date
2004
Author(s)
Ku, Yu-Hsien
DOI
en-US
Abstract
Data and multimedia services are becoming more and more dominant, and worldwide operators are announced that they are ready to provide 3G (3rd Generation Wireless Systems) service. 3G will allow more advanced added-value data services for mobile users, who can, for example, view downloaded or streaming video content at a data rate of 384 Kbps to 2 Mbps over the radio spectrum. Call admission control plays an important role in providing different QoS guarantee for each user.
UMTS (Universal Mobile Telecommunications System) using WCDMA (Wideband Code Division Multiple Access) is one of popular standard of 3G. By using CDMA technique, messages for different users are identified, and all users use the same bandwidth to transfer messages in the same time slot. However, the interference caused by the transmission power of other users will be the limit of system capacity.
This thesis focuses on the viewpoint of the capacity and the maximum revenue of the whole system to achieve the optimal network resource utility and the maximum total revenue for the subscribers. In past, researches in WCDMA call admission control are only consider unidirectional (uplink or downlink) interference and most of them discuss voice traffic only. In this thesis, we combined the most important issues, such as downlink interference, uplink interference, voice/data integrated traffic, power control and soft handover into consideration.
This thesis developed a mathematical programming model to formulate this joint design optimization problem. This problem turns out to be a linear mixed integer programming problem. A set of heuristic solution procedures based on Lagrangian relaxation methods is proposed to solve the complicated problem.
Subjects
寬頻分工多重擷取系統(WCDMA)
拉格蘭日鬆弛法
允入控制
容量管理
服務品質
第三代行動通訊系統
軟式訊號交遞
數學最佳化
Lagrangian Relaxation Method
WCDMA
Capacity Management
Call Admission Control
Quality of Service
Soft Handover
3rd Generation Wireless System
Mathematical Optimization
Type
other
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