A Proposal of Multihop Mesh Network Architecture Featuring Adaptive Network Control for Broadband Fixed Wireless Access Systems

摘要

As a means of flexibly providing large-capacity access infrastructure at a low cost, the broadband fixed wireless access (BFWA) system using millimeter-wave and quasi-millimeter-wave frequencies is promising. In general, wireless channel quality variations are significant due to rainfall in wireless systems using millimeter-wave and quasi-millimeter-wave frequencies. Hence, deterioration of the channel working rate is a problem. In this paper, a multihop wireless access system with a mesh configuration is proposed that can deploy a millimeter- and quasi-millimeter-wave BFWA system at a high quality and a high density. In the proposed system, deterioration of the channel working rate due to wireless channel quality variations is avoided. In addition, the capacity is maximized by adap-tively assigning the network resources for variations of the traffic demand and wireless channel transmission capacity. Further, as an adaptive control used in the proposed system, wireless channel assignment for a wireless link and load distribution among several paths within the mesh network are discussed. The problem is formulated as a mixed nonlinear optimization problem. In addition, a heuristic solution is proposed for solving the problem within a realistic time for a network of the anticipated size. The proposed algorithm is applied to a mesh network and the behavior and the performance of the algorithm are evaluated to prove its effectiveness.