A mobile broadband system based on fixed wireless routers

Abstract

A new radio access network archilecture for a mobile broadband system is introduced that uses Fixed Wireless Routers (FWR) to provide radio coverage to otherwise shadowed areas. Highest spectrum capacity and lowest possible transmit power as main t a r p t s will be e reached by using low power (1 W) pic0 base stations using a wireless or mobile broadband air interface at Access Points (AP) to the core network and at FWRs to trade the high capacity available at APs against radio coverage range. The so-called Wireless Media System (WMS) will provide broadband access to terminals with medium velocity of movement and is embedded into a cellular radio network to support a high velocity of terminals with medium transmission rate. The low power used at the base stations leads to a pico-cellular concept relying essentially on multihop communication across r u e d wireless bridges or routers and to some extent also on ad-hoc networking. The new concept to achieve broadband radio coverage in densely populated areas is described and fwst analysis results of some crucial elements are presented.

Large Scale Routing in a Multi-Hop Cellular Network Using a Radial Geometric Approach

“…Our solution incorporates a hybrid network model that integrates the benefits of both peer-to-peer multi-hop and cellular networks. Substantial work including those mentioned in [5,6] demonstrate that peer to peer routing in hybrid networks extends the reach of network, lowers per-node power requirements, and increases the raw capacity of a network. At the same time, base stations better support large scale routing without involving mobile users in the routing process.…”

Multimode Communication Protocols Enabling Reconfigurable Radios

“…Wireless mobile broadband systems, providing a patchy coverage in densely populated urban areas, will play an important role. For details on such a fixed and planned relaybased radio network, see [1,2]. The addressed future wireless network will have to combine several radio access technologies (RATs).…”

Multi-Antenna Relay Nodes in OFDM Systems

“…The radio propagation at these frequency bands is more vulnerable to non-line-ofsight conditions and the achievable bit rates drop fast with higher distances from the serving base station. One obvious solution is to increase the density of base stations, but also relays are a possibility to distribute the capacity of a wireless network more evenly within its coverage area [1]. OFDM (Orthogonal Frequency Division Multiplexing) has been adopted by several wireless standards and because of its suitability for high data-rate transmission over a multi-path fading channel it is a potential candidate for future radio systems.…”

“…n, is the additive white Gaussian noise vector at the relay or destination with zero mean and variance NO elements. (1) In the remainder of this paper we will drop the index of the subcarrier to get more compact formulas. The relay amplifies the received signal, transmits in the second time slot x and the destination receives for the pure AF protocol: YD = k(ER+ NE ) HRDHSRX + iD, (2) where k denotes the number of antennas at the relay node.…”