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Method and algorithm for near real time cellular network optimization using antenna tilt control

IP.com Disclosure Number: IPCOM000132037D
Original Publication Date: 2005-Nov-29
Included in the Prior Art Database: 2005-Nov-29
Document File: 6 page(s) / 225K

Publishing Venue

Motorola

Related People

George Calcev: INVENTOR [+2]

Abstract

This paper presents a real-time procedure for antenna tilt control in cellular networks. The method is based on game theory and is using only local information for adjusting antenna's tilt. The solution was verified using CDMA motion simulator and real data collected in downtown Delhi. The simulations show a significant improvement of call drops when the tilt is adapted to the traffic changes.

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MOTOROLA TECHNICAL DEVELOPMENTS

INFORMATION SHEET

FOR DEFENSIVE PUBLICATION

Date:                5 May, 2005

Title:                         Method and algorithm for near real time cellular network optimization using antenna tilt control

Docket No.:             CE14580R (31768)

Author #1

Name:              George Calcev

Author #2

Name:              Matt Dillon

 


Method and Algorithm for near Real-time Cellular Network Optimization using Antenna Tilt Control

 

George Calcev, Matt Dillon

Motorola, Inc.

Networks Business

 

ABSTRACT

This paper presents a real-time procedure for antenna tilt control in cellular networks. The method is based on game theory and is using only local information for adjusting antenna’s tilt. The solution was verified using CDMA motion simulator and real data collected in downtown

Delhi

.  The simulations show a significant improvement of call drops when the tilt is adapted to the traffic changes.

PROBLEM

Radio coverage and interference reduction are in modern cellular systems crucial problems to be solved by the RF engineers. The initial deployment of cellular systems is based on extensive drive tests and computer simulations; later on the system parameters are fine tuned based on long-term statistics and fault reports. Unfortunately, this approach does not cope in real-time with changes in traffic and propagation conditions. Antenna orientation, height and pattern down tilting play important roles in radio network planning and optimization.  The effects of antenna height and tilt in cellular networks are presented in [1]. The authors show significant reductions in path loss and delays spread, as well as reduction in power transmitted and system interference when suitable height and pattern tilt are selected. The tradeoff between coverage and capacity using dynamic optimization of a simple four-cell model of a 3G cellular network is presented in [2]. In this paper the authors consider optimization of antenna tilt, cell power level and pilot power fraction and show that even for uniform traffic the optimization provides a set of network configurations with larger capacity-coverage tradeoff. Moreover, they show that the performance gains grow with increasing traffic non-uniformity. The effect of electrical and mechanical antenna down-tilting in UMTS networks is presented in [3]. Using computer simulations of three-sector cells the authors demonstrate the need of the antenna settings adaptation to the expected traffic distribution and cell size. Using simulation the authors find that the smaller cell size the larger antenna down-tilt and the higher the traffic load the smaller antenna down-tilt should be. The analyze antenna pattern tilting in cellular networks is the subject of other recent papers the authors [4-9]. Fewer papers though present algorithms for down-tilt control. In [10] the authors using real pathloss collected from urban and suburban environments show using computer...