REUSE-PARTITIONING-BASED FREQUENCY PLANNING FOR TWO-HOP CELLULAR NETWORKS WITH NLOS BS-RELAY LINKS

The frequency planning for a cellular system enhanced with two-hop fixed relay nodes （FRNs） is investigated. It is assumed that there is no performance-enhancing technique on the base station （BS）-FRN links. Under the assumed condition, two frequency planning schemes are proposed by the principle of reuse partitioning （RP）. The frequency planning schemes are compared with the channel-borrowing-based frequency planning scheme and the conventional frequency planning scheme without relaying. Theoretical analysis and simulation results show that the proposed schemes can improve the service quality for mobile terminals close to cell boundaries and provide better performance over the channel-borrowing-based frequency planning. Finally, to fully exploit the potentials of FRN enhanced cellular system, some performance enhancing techniques on BS-FRN links are indispensable.

Reuse partitioning based frequency planning for two-hop cellular network

Following the principle of reuse partitioning, two new frequency planning schemes are proposed, the coverage-oriented scheme and the efficiency-oriented scheme, for the cellular system with two-hop fixed relay nodes （FRNs）. Compared with the effficiency-oriented scheme, the coverage-oriented scheme has higher reuse distances and is developed with emphasis on the coverage, while compared with the coverage-oriented scheme, the efficiency-oriented scheme has smaller reuse distances and is developed with emphasis on the spectral efficiency. Taking uplink as an example, both simplified analysis and intensive computer simulations are presented to offer comparisons among FRN enhanced systems with the proposed schemes, with a known channel-borrowing based frequency planning scheme and the conventional cellular system without relaying. Studies show that the FRN enhanced system with the coverage-oriented scheme provides the best coverage, while that with the efficiency-oriented scheme offers the highest area spectral efficiency.

Contribution for Efficient Planning of Millimeter Wave Frequencies: Case of the 80 GHz E-Band for High-Speed Broadband Transmissions

Due to the very high demand for Internet data capacity from mobile and fixed customers as well as the saturation of conventional frequency bands by numerous services, many countries have opened the E band, for broadcasting services. E-band involves the creation of a significant number of links in a given area. The present work addressed the problem that arises in the context of transmission is that of assigning the frequencies of this band to these multiple transmission links. The aim of this work is to study and plan the radio links of the 80 GHz frequency and to implement them in a tool in order to define an optimal distribution on the telecommunications network by guaranteeing maximum flow of data traffic while minimizing the interference. The contribution of this work is part of its unique subject: the planning of E-band frequencies for improving the quality of service of transmission in the network of telecommunications operators. Also, it intends to contribute to the resolution of unsatisfied situations of poor planning of E-band radio frequencies in telecommunications networks. With the aim of opening several opportunities for alternative high-speed data transport solutions, our work has helped prove that E-band transmission links are very efficient with capacities in the gigabyte range.

Multifrequency Networking Solution for TD-SCDMA

This paper introduces the characteristics of TD-SCDMA, and analyzes some networking schemes and methods of multifrequency. For the 5 MHz frequency bandwidth, a frequency planning scheme containing three frequencies is examined, and a simulation model is built to validate the performance of this scheme. Finally, this paper analyzes the advantages and disadvantages of the scheme, and proposes some directions for the future study of networking planning.

Frequency Trajectory Planning-based Frequency Regulation Strategy for Wind Turbines Equipped with Energy Storage System

The increase in wind power penetration has weakened the equivalent inertia of the power system,posing a significant challenge to frequency stability.In this paper,a frequency trajectory planning(FTP)-based frequency regulation(FR)strategy is proposed for permanent magnet synchronous generator-based wind turbines equipped with an energy storage system(ESS)on the DC link.The core idea is that the frequency index provided by the grid code is used to plan a safe frequency trajectory when the system frequency fluctuates.The FR power provided by the ESS is controlled by tracking the planned frequency trajectory to compensate for the unbalanced power in the system,provide inertia support,and ensure the frequency stability of the power grid.The proposed strategy can suppress the frequency fluctuation and optimize the FR power of the ESS.It also effectively circumvents the complex parameter design process of virtual inertia control.The simulation model is established in Matlab/Simulink to verify the effectiveness of the control strategy.