Accession Number : ADA315285

Title :   Research Problems in Wireless Communication Networks.

Descriptive Note : Progress rept. 1 Nov 94-31 Dec 95,

Corporate Author : POLYTECHNIC UNIV BROOKLYN NY

Personal Author(s) : Tassiulas, Leandros

PDF Url : ADA315285

Report Date : 15 JUL 1996

Pagination or Media Count : 34

Abstract : The work performed under the support of the aforementioned AFOSR grant includes research on terrestrial wireless access system and satellite networks. In a terrestrial network, a multlayer cellular architecture was investigated. It consists of layers with dense frequency reuse for mobiles dose to base stations and with sparser frequency reuse for remote mobiles. Channel control schemes that increase the spectrum utlization were proposed and studied. In the digital wireless systems of the near future, a mobile terminal will have control over the transmission power, channel selection and base station assignment. Control algorithms that compute and assign all those quantities in order to increase the efficiency and robustness of the system were studied. The optimal solutions in the two base station case were obtained, while heuristic algorithms for larger systems were proposed and evaluated. It appears that the joint control of power, channel and base station assignment can significantly increase the performance of the system. The problem of management and control in networks with time varying topology as it arises in low earth orbit satellite networks was studied. Control policies that use predictions of the network topology evolution were proposed and studied. The magnitude of improvement in the performance using predictive policies was significant.

Descriptors :   *COMMUNICATIONS NETWORKS, *SATELLITE COMMUNICATIONS, *SATELLITE NETWORKS, FREQUENCY, MILITARY FACILITIES, OPTIMIZATION, POLICIES, MANAGEMENT, VARIATIONS, TRANSMITTANCE, SOLUTIONS(GENERAL), TOPOLOGY, HIGH DENSITY, EVOLUTION(GENERAL), ALLOCATIONS, POWER, ARCHITECTURE, EARTH(PLANET), CHANNELS, RADIO STATIONS, CHANNEL SELECTORS.

Subject Categories : Unmanned Spacecraft
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE