System features

The following is a list of the system's main features.

· WALKair supports three frequency bands: 3.5 GHz, 10.5 GHz and 26 GHz. These bands are certified in Europe for PMP systems by ETSI. The various regulatory authorities in Europe (and other countries as well) license either one or two of these bands.

· The total RF bandwidth available per cell is typically 2 x 14/28 MHz If the regulated RF bandwidth is higher or lower than that, the system is designed to gradually use higher or lower bandwidth, at granularity of 1.75 MHz.

· Access method is TDMA/FDMA/FDD. The system uses a TDMA access scheme shared by a group of users at a radio bandwidth of 1.75 MHz. There is one frequency for uplink and another one dedicated to the downlink (FDD). Each such radio slice shares a FDMA scheme.

· High radio utilization using 64QAM modulation, with trellis FEC for coding gain. Spectral efficiency is 2.5 bit/sec/Hz.

· Fiber-optics equivalent quality with BER<10-9 and 99.999% availability

· Efficient cell planning with high reuse factor

· The system capacity is determined by the allocated spectrum the net capacity for a typical 14 MHz x 2 allocation @ 3.5 GHz is 65 Mbps. At special conditions, it may be doubled to 130Mbps.

· Any single TS may utilize flexible baseband bandwidth, using sophisticated a Dynamic Bandwidth Allocation mechanism, providing service oriented concentration ranging from 64 Kbps up to 4.096 Mbps (with a granularity of 64 Kbps).

· Bandwidth reservation Quality Of Service

· Interference immunity using automatic frequency adaptation. The system quantifies the interference level and if necessary, selects another frequency which is less prone to interference.

· Multi-service platform, supporting PABX type equipment for voice applications, and a variety of Telecom interfaces for data and Internet applications; this includes Leased Line, starting from fractional E1 up to full E1, Frame Relay, ISDN BRI/ PRI and IP service.

· Wide variety of Telecom interfaces: V35, X.21, G.703, E1, ISDN BRI / PRI and Ethernet.

· Modular architecture provides a flexible pay-as-you-grow cost structure.

· Modular, fault tolerance architecture minimizes downtime and allows for quick recovery.

· Complete management and control capacities include performance monitoring and remote software download. Management and control are available using an SNMP-based management station which runs on HPOV.

· A full system specification is presented in Section 5.

4 WALKair^TM system and building blocks

The WALKair PMP system consists of a Base Station (BS) with multiple Terminal Stations (TS). The BS is connected by radio channels to all TS.

The Base Station is a modular hub, connected to the Telecom switches on one side and to the service areas, via the Terminal Stations, on the other side. Each Terminal Station provides various Telecom services, such as leased line, ISDN, Frame Relay etc., utilizing a flexible bandwidth up to 4 Mbps capacity. The entire base station provides a total network capacity of 65 Mbps@14MHz, which is divided among the Terminal Stations as required, using flexible bandwidth allocation.

The following diagram illustrates the system architecture.

Figure 5: WALKair’s System Architecture

Date: 2015-01-11; view: 653