Power Control and Call Admission Policies for Multiclass Traffic in SIR-Based Power-Controlled DS-CDMA Cellular Networks

本计画旨在研究蜂巢式网路中的基本问题，特别是与呼叫接纳控制机制相关的问题。有效的呼叫接纳控制方案为用户提供接入无线网络的能力，同时也是网络运营商保证服务和有效运营的关键。在这个为期三年的项目中，将特别开展以下研究活动。首先，一种新的呼叫接纳控制算法的信号干扰比（SIR）的基础上的功率控制的直接序列码分多址（DS-CDMA）蜂窝网络，提供多种服务类别将被开发。当一个新呼叫（或一个越区切换呼叫）到达一个基站请求接纳时，将计算该新呼叫的新的、所需的功率电平以及所有现有呼叫的功率电平。这些计算基于在基站处接收的干扰和期望的服务质量目标（即，期望的SIR）。在较高优先级呼叫（例如，切换呼叫）的情况下，可以允许用于新呼叫和切换呼叫的不同阈值。本项目的研究将特别关注基于目标功率电平的计算易处理的计算的接纳控制决策，这将避免用于确定所有用户所需功率电平的功率控制的迭代过程。最后，功率控制算法与有力的理论结果的稳定性，收敛性和可行性的解决方案也将研究在未来的蜂窝网络中的最佳适用性。该项目将包括研究生和本科生，并将作为提高学生对无线网络问题的认识和兴趣的手段进行。

This project aims at studying problems fundamental in cellular networks and specifically related to the call admission control schemes. Efficient call admission control schemes provide the users with access to wireless networks and at the same time are crucial for network operators in guaranteeing services and operating efficiently. In this three-year project, the following research activities will be particularly pursued. First, a novel call admission control algorithms for signal-to-interference ratio (SIR) based power-controlled direct sequence code division multiple access (DS-CDMA) cellular networks that provide multiple classes of services will be developed. When a new call (or a handoff call) arriving at a base station requesting for admission, the new, desired, power level for that new call as well as the power levels for all existing calls will be calculated. These calculations are based on the interference received at the base station and the desired quality of service target (i.e., the desired SIR) for each call. In the case of a higher priority calls, e.g. handoff calls, different thresholds for new calls and handoff calls can be allowed. The research within this project will particularly focus on the admission control decision based on a computationally tractable calculation of the target power level, which would avoid the iterative process of power control for determination of the required power levels for all users. Finally, power control algorithms with vigorous theoretical results regarding stability, convergence, and feasibility of solutions will also be studied for the best applicability in future cellular networks. This project will include graduate and undergraduate students in research and will be conducted as means of creating awareness and interest among students on the issues surrounding wireless networks.