Abstract
Considering a multihop cellular system with one relay per sector, an effective modeling for the joint base-station/relay assignment, rate allocation, and routing scheme is proposed and formulated under a single problem for the downlink. This problem is then formulated as a multidimensional multichoice knapsack problem (MMKP) to maximize the total achieved throughput in the network. The well-known MMKP algorithm based on Lagrange multipliers is modified, which results in a near-optimal solution with a linear complexity. The notion of the infeasibility factor is also introduced to adjust the transmit power of base stations and relays adaptively. To reduce the complexity, and in order to analyze the underlying key factors in the system, the framework is restricted to a two-base-station two-relay system. In fact, the output of the proposed algorithm is the joint optimization of the routing path, and base-station selection to achieve the maximum total throughput in the system, which in conjunction with the proposed adaptive scheme leads to the implementation of the cell breathing via allocating the proper transmit power to the base-stations and relays.
Highlights
Future wireless systems will require the capability to support very large throughput in selected areas, according to the location dependent and dynamic user demand, rather than the capability to support uniform traffic and coverage throughout a large service area
Transmissions from a base station (BS) to a terminal occur over a number of hops, where devices other than base stations/access points or enduser terminals act as repeaters
We propose an architecture for a network utilizing the out-of-band transmission for the forwarding traffic along with time domain scheduling (TDS) for the access traffic for the joint optimization of the degree of the multihop, routing path, and BS selection to achieve the maximum total throughput in the system
Summary
Future wireless systems will require the capability to support very large throughput in selected areas, according to the location dependent and dynamic user demand, rather than the capability to support uniform traffic and coverage throughout a large service area. Transmissions from a base station (BS) to a terminal occur over a number of hops, where devices other than base stations/access points or enduser terminals act as repeaters. In Type II multihop, repeaters can be designed with a simplified functionality, so that their cost can be significantly less than that of a regular BS or access point. With this approach and with the capability of being self-configuring, these relays can be deployed in an autonomous manner, so that the network infrastructure grows organically according to the local need for the capacity increase [11]. In this paper, we focus on Type II multihop cellular networks
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