Flexible Architecture That 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 reference model of the resulting Internet Protocol (IP) centric network architecture is shown in Figure 1.
Figure 1: xMax Network Architecture Reference Model
As the diagram indicates, the network architecture includes the following elements:
Note: Radio spectrum utilization is highly efficient in that the system occupies only that spectrum which is necessary for individual data streams. The bandwidth of each channel is 1.44MHz with sufficient guard band between channels.
While the xAP appears conventional in both architecture and functionality, it provides flexibility, scalability and reliability not found in conventional mobile or WiFi-based wireless networks. The ANG (xMSC) is a novel piece of wireless infrastructure equipment that consists of 100% off-the-shelf hardware with proprietary software developed by xG:
Among the unique characteristics of the xMax network architecture is the way mobility is implemented. The system provides soft handoffs with make-before-break capability (timeslots are acquired before breaking a connection), which result in reliable roaming and a seamless user experience. With all handoff decisions made at the xMod level via proactive channel scanning, there is no need for inter-base station (xAP) communication, which helps drive seamless operation.
The architecture further supports low-cost service deployment objectives by leveraging commercial off the shelf (COTS) voice over IP (VoIP) equipment, software and services within the xMSC. The VoIP core contained within the xMSC consists of the following elements:
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