Analytical Evaluation of Coverage-Oriented Femtocell Network Deployment

This paper proposes a coverage-oriented femtocell network deployment scheme, in which the femtocell base stations (BSs) can decide whether to be active or inactive depending on their distances from the macrocell BSs. Specifically, as the areas close to the macrocell BSs already have satisfactory cellular coverage, the femtocell BSs located inside such areas are kept to be inactive. Thus, all the active femtocells are located in the poor macrocell coverage areas. Based on a stochastic geometric framework, the coverage probability can be analyzed with tractable results. Surprisingly, the results show that the proposed scheme, although with a lower defacto femtocell density, can achieve better coverage performance than that keeping all femtocells in the entire network to be active. The analytical results further identify the achievable optimal performance of the new scheme, which provides mobile operators a guideline for femtocell deployment and operation.Comment: 6 pages, 7 figures, published in IEEE International Conference on Communications (ICC'13

On the physical layer security in large scale cellular networks

This paper studies the information-theoretic secrecy performance in large-scale cellular networks based on a stochastic geometry framework. The locations of both base stations and the mobile users are modeled as independent two-dimensional Poisson point processes. We consider a key feature of the cellular network, namely, information exchange between base stations, and characterize its impact on the achievable secrecy rate of an arbitrary downlink transmission with a certain portion of the mobile users acting as potential eavesdroppers. In particular, analytical results are presented under diverse assumptions on the availability of eavesdroppers' location information at the serving base station, which captures the benefit from the exchange of mobile users' location information between base stations.H. Wang is with the Australian National University and NICTA. NICTA is funded by the Australian Government as represented by the Department of Broadband, Communications and the Digital Economy and the Australian Research Council through the ICT Centre of Excellence program. This work was supported by the Australian Research Councils Discovery Projects funding scheme (Project No. DP110102548 and Project No. DP130101760)

Physical layer security in cellular networks: a stochastic geometry approach

This paper studies the information-theoretic secrecy performance in large-scale cellular networks based on a stochastic geometry framework. The locations of both base stations and mobile users are modeled as independent two-dimensional Poisson point processes. We consider two important features of cellular networks, namely, information exchange between base stations and cell association, to characterize their impact on the achievable secrecy rate of an arbitrary downlink transmission with a certain portion of the mobile users acting as potential eavesdroppers. In particular, tractable results are presented under diverse assumptions on the availability of eavesdroppers' location information at the serving base station, which captures the benefit from the exchange of the location information between base stations.This work was supported by National ICT Australia (NICTA), and the Australian Research Council's Discovery Projects funding scheme (Project No. DP110102548 and DP130101760). NICTA is funded by the Australian Government as represented by the Department of Broadband, Communications and the Digital Economy and the Australian Research Council through the ICT Centre of Excellence program

Analytical evaluation of coverage-oriented femtocell network deployment

This paper proposes a coverage-oriented femtocell network deployment scheme, in which the femtocell base stations (BSs) can decide whether to be active or inactive depending on their distances from the macrocell BSs. Specifically, as the areas close to the macrocell BSs already have satisfactory cellular coverage, the femtocell BSs located inside such areas are kept to be inactive. Thus, all the active femtocells are located in the poor macrocell coverage areas. Based on a stochastic geometric framework, the coverage probability can be analyzed with tractable results. Surprisingly, the results show that the proposed scheme, although with a lower defacto femtocell density, can achieve better coverage performance than that keeping all femtocells in the entire network to be active. The analytical results further identify the achievable optimal performance of the new scheme, which provides mobile operators a guideline for femtocell deployment and operation.H. Wang is with the Australian National University and NICTA. NICTA is funded by the Australian Government as represented by the Department of Broadband, Communications and the Digital Economy and the Australian Research Council through the ICT Centre of Excellence program. This work was supported by the Australian Research Councils Discovery Projects funding scheme (Project No. DP110102548 and Project No. DP130101760)

Using one-minute television spots to educate the public about forestry

In the Pacific Northwest, as in much of the United States, conflicting views among environmentalists, forest industries, government agencies, and policy makers have left the public with a confused picture of forestry issues and practices. So, it should come as no surprise when citizens base their opinions of natural resource issues on incomplete or inaccurate information. To help combat this problem, the College of Forestry at Oregon State University and the Oregon Forest Resources Institute (OFRI) recently combined forces to create and broadcast seven one-minute television spots based on the latest scientific information about managing Oregon’s forests. These spots were educational in nature, not promotional. They were designed to meet the public’s desire for science-based information about how their forests are managed. It was hoped that seeing these messages would help viewers make better decisions about their use of natural resources, become more informed and effective participants in policy decisions regarding forests and forest products, and better understand how forests and forestry affect their lives. Their purpose was not to convince viewers that forest practices of the past (or present) are inherently good or bad. Unlike public service announcements, these spots were broadcast frequently and at prime time to reach the target audiences most effectively

Natural resource education: Getting forest products workers into the flow

The forest products industry employs over 1.4 million people in the U.S.; it ranks among the top ten manufacturing employers in 46 states. Surprisingly, a recent survey of U.S. forest products workers revealed substantial ignorance and misperceptions about forests and forestry issues. Despite this, few educational programs are targeted at this audience. The Oregon Forest Resources Institute has teamed up with Oregon State University\u27s Forestry Media Center to fill this gap with Project FLOW (Forestry Learning Opportunities for Workers). Phase one of this project, completed in summer 1997, analyzed current status of forestry educational opportunities for forest workers in Oregon: existing educational activities, opportunities for new programs, and obstacles to implementing new programs. A mail-in survey, sent to human resource officers or chief executives of 590 forest products businesses in Oregon, indicated that it was important for forest workers to have reliable information about forestry topics. However, fewer than half those responding said that their company currently distributes educational materials or provides on-the-job learning opportunities. Principal obstacles cited were lack of time during the workday, lack of staff, and lack of relevant and effective educational materials. Phase two of this project will use the survey data, as well as information collected from focus groups, site visits, and telephone conversations with key stakeholders, to develop and pilot-test learning materials in various formats. We anticipate that materials developed through this project will have wide application throughout the United States-and that better-informed workers are likely to become better individual decision makers and more effective ambassadors for sound forest management