A Radio Resource Allocation Scheme for Fixed Broadband Wireless Access Systems with Avoidance of Major Interferers

Abstract

An improved radio resource allocation scheme with avoidance of major interferers is proposed and analyzed for the downlink of Fixed Broadband Wireless Access (FBWA) systems with full frequency reuse. The scheme is based on Enhanced Staggered Resource Allocation (ESRA) and permits the enhancement of the throughput per sector. Simulation results show a maximum downlink throughput per sector in excess of 44% and an increase of 10% with respect to ESRA is achieved, with Base Station (BS) selection procedure, while meeting a 15 dB signal-to-interference ratio (SIR).

Performance improvement of fixed wireless access networks by conjunction of dual polarization and time domain radio resource allocation technique

“…Time domain scheduling with S terminals per sector and full frequency reuse in the 2-11 GHz frequency bands are assumed. The service area is divided into hexagonal cells and triangular sectors [2,3]. Each sector is equipped with its own directional antenna and is labelled from 1 to 6 counter-clockwise, in such a way that there are no adjacent sectors bearing the same label ( Figure 1).…”

“…However, under the proposed framework, each sector antenna is transmitting with orthogonal polarization with respect to its adjacent sector antennas. Hence, the amount of intracell interference is significantly reduced according to (3).…”

“…The TDMA frame is always divided into K = 6 subframes equal to the number of sectors per cell. Each sector schedules packets for transmissions, starting from A and following the staggered order A, B, C, D, E and F [3], shown in Figure 2. The purpose of this scheduling is to manage more efficiently the impact of major intracell and intercell interferers.…”

“…An increased effort is focused on the corresponding time domain radio resource allocation techniques (RRA) [2][3][4] in order to organize the total amount of interference. Additionally, the use of alternate polarization allocation (PA), as a mean to decrease the interference into the desired signal, is introduced in systems operating under LOS conditions [5].…”

“…Specifically, in [2] a heuristic scheduling mechanism along with a terminal classification procedure has been proposed for interference reduction. This concept is improved with the different scheduling mechanisms for odd and even sectors [3]. In [4], the scheme is extended with the introduction of power shaping concept.…”