The company developed cognitive radio technology for mobile services using licensed or unlicensed radio pectrum.xG's initial product is xMax, a carrier-class cognitive radio network.
xMax is a fixed and mobile wireless broadband system that includes a complete product line of high-performance access points, fixed and mobile personal WiFi hotspots, mobile switching centers (MSC) as well as network management and deployment tools. xG’s unique and patented protocol outperforms WiFi, WiMax and traditional cellular technologies like LTE in shared and interference prone radio bands. The xMax over the air waveform has been specifically designed for use in a deterministic (i.e. fixed low latency) cognitive radio network. This waveform, in conjunction with its purpose built Media Access Control (MAC) layer, offers capabilities and performance not found in other wireless solutions.
xMax is an end-to-end Internet Protocol (IP) network solution that incorporates xG’s patented cognitive radio technologies to deliver the first fully mobile VoIP and broadband network that also supports any smartphone, laptop, tablet and other commercial WiFi or IP-enabled devices via its xMod personal hotspot – while offering an excellent quality of service (QoS) and fixed, low latency.
xMax is designed to prioritize voice by delivering dedicated timeslots and bandwidth to every user. This approach guarantees a minimal and fixed latency for every call, which is an essential factor for any high Quality of Service (QoS) mobile VoIP system. This is in contrast to technologies like Wi-Fi and WiMAX, both of which are contention-based "best effort" delivery systems that are limited by scalability constraints.
Flexible Architecture Enhances and Extends Today’s Services
The primary consideration in the network architecture design of the xMax system is to achieve the goal of providing robust, scalable, and full-featured voice and data services to fixed and mobile subscribers at a fraction of the cost of traditional approaches. The system uses a proprietary over the air waveform that has been optimized for our sensing-based cognitive radio. While based on Orthogonal Frequency-Division Multiplexing (OFDM), xG’s unique and patented protocol outperforms WiFi, WiMax and traditional cellular technologies like LTE in shared and interference prone radio bands.
In addition to its proprietary and highly optimized over the air protocol, xMax offers several unique and valuable capabilities not found in other cognitive (and traditional) radio networks. These include its all-IP (Internet Protocol) architecture, as well as its support of commercial smartphones, laptops, tablets and other WiFi and Ethernet capable Internet appliances via the xMod personal hotspot. A sample reference model of the resulting Internet Protocol (IP) centric network architecture is shown in Figure 1.
As the diagram indicates, the network architecture includes the following elements:
A proprietary xMax over the air-interface designed for cognitive radio operation in unlicensed as well as licensed bands.
xMod fixed and xVM mobile hotspots that bridge WiFi-enabled commercial smartphones, laptops, tablets and other Internet ready devices to the xMax cognitive network.
xAPs, which provides wide area connectivity to end users devices via xMods. The xAP is a compact, single channel access point optimised for cognitive radio operation. Up to 18 xAPs can be co-located to provide up to 108 Mbps of total data in the 900 MHz ISM band. xMax channelizes the 902-928 MHz band into 18 discrete channels, which are only used when there is traffic to mobile devices that are registered with a particular channel.
Access Network Gateway (ANG), called the xMSC in an xMax network that provides call process, IP packet delivery services and several other IP, mobility and network signaling related functions.
Technology-agnostic backhaul links from xAP sites and the ANG (Fiber, Metro Ethernet, PTP Wireless, etc.).